From 1ec63d4d2358f97e6a184987660ec1a4a58fe723 Mon Sep 17 00:00:00 2001
From: Stephen McGruer <smcgruer@google.com>
Date: Wed, 17 Jun 2015 14:39:19 -0400
Subject: [PATCH] uclibc: updates for Chromium

+ pull in part of:
http://lists.busybox.net/pipermail/buildroot/2015-March/123387.html
to add fmaxf/fminf

+ pull in
http://git.uclibc.org/uClibc/commit/?id=a8dc90eaaa5e6474beac828558d969b1aafee4af
to add context methods

+ enable UCLIBC_SUSV3_LEGACY and UCLIBC_HAS_CONTEXT_FUNCS for
getcontext/setcontent
---
 ...bc-0069-Add-missing-C99-float-ld-wrappers.patch |  870 +++++++
 ...t-set-swap-make-context-user-context-mani.patch | 2550 ++++++++++++++++++++
 package/uclibc/uclibc.mk                           |    2 +
 3 files changed, 3422 insertions(+)
 create mode 100644 package/uclibc/0.9.33.2/uclibc-0069-Add-missing-C99-float-ld-wrappers.patch
 create mode 100644 package/uclibc/0.9.33.2/uclibc-0070-libc-add-get-set-swap-make-context-user-context-mani.patch

diff --git a/package/uclibc/0.9.33.2/uclibc-0069-Add-missing-C99-float-ld-wrappers.patch b/package/uclibc/0.9.33.2/uclibc-0069-Add-missing-C99-float-ld-wrappers.patch
new file mode 100644
index 0000000..35cf3e4
--- /dev/null
+++ b/package/uclibc/0.9.33.2/uclibc-0069-Add-missing-C99-float-ld-wrappers.patch
@@ -0,0 +1,870 @@
+From 6c4538905e65ceb203f59aaa9a61728e81c6bc0a Mon Sep 17 00:00:00 2001
+From: Bernhard Reutner-Fischer <rep.dot.nop at gmail.com>
+Date: Wed, 18 Mar 2015 21:32:22 +0000
+Subject: libm: Add missing C99 float/ld wrappers
+
+Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop at gmail.com>
+
+Status: upstream [uClibc]
+http://git.uclibc.org/uClibc/commit/?id=6c4538905e65ceb203f59aaa9a61728e81c6bc0a
+
+Removed patch for ./TODO.
+Needed to avoid run-time errors with mesa3d which depends on fminf
+
+Signed-off-by: Bernd Kuhls <bernd.kuhls at t-online.de>
+---
+diff --git a/include/complex.h b/include/complex.h
+index 91efc0d..ed7e502 100644
+--- a/include/complex.h
++++ b/include/complex.h
+@@ -79,6 +79,7 @@ __BEGIN_DECLS
+ #endif
+ #include <bits/cmathcalls.h>
+ #undef	_Mdouble_
++#undef	_Mfloat_
+ #undef	__MATH_PRECNAME
+ 
+ /* And the long double versions.  It is non-critical to define them
+@@ -97,6 +98,7 @@ __BEGIN_DECLS
+ # include <bits/cmathcalls.h>
+ #endif
+ #undef	_Mdouble_
++#undef	_Mlong_double_
+ #undef	__MATH_PRECNAME
+ #undef	__MATHDECL_1
+ #undef	__MATHDECL
+diff --git a/include/math.h b/include/math.h
+index ecb9aa6..1b54c9e 100644
+--- a/include/math.h
++++ b/include/math.h
+@@ -129,6 +129,7 @@ __BEGIN_DECLS
+ # undef	_Mdouble_
+ # undef _Mdouble_BEGIN_NAMESPACE
+ # undef _Mdouble_END_NAMESPACE
++# undef _Mfloat_
+ # undef	__MATH_PRECNAME
+ # undef __MATH_maybe_libm_hidden_proto
+ 
+@@ -176,6 +177,7 @@ extern long double __REDIRECT_NTH (nexttowardl, (long double __x, long double __
+ #  undef _Mdouble_
+ #  undef _Mdouble_BEGIN_NAMESPACE
+ #  undef _Mdouble_END_NAMESPACE
++#  undef _Mlong_double_
+ #  undef __MATH_PRECNAME
+ #  undef __MATH_maybe_libm_hidden_proto
+ 
+diff --git a/libc/sysdeps/linux/common/bits/mathcalls.h b/libc/sysdeps/linux/common/bits/mathcalls.h
+index 84b793c..9bebb51 100644
+--- a/libc/sysdeps/linux/common/bits/mathcalls.h
++++ b/libc/sysdeps/linux/common/bits/mathcalls.h
+@@ -74,8 +74,22 @@ __MATHCALLI (atan2,, (_Mdouble_ __y, _Mdouble_ __x))
+ 
+ /* Cosine of X.  */
+ __MATHCALLI (cos,, (_Mdouble_ __x))
++# if defined _LIBC && defined _Mlong_double_
++libm_hidden_proto(cosl)
++# endif
++# if defined _LIBC && defined _Mfloat_
++libm_hidden_proto(cosf)
++# endif
++
+ /* Sine of X.  */
+ __MATHCALLI (sin,, (_Mdouble_ __x))
++# if defined _LIBC && defined _Mlong_double_
++libm_hidden_proto(sinl)
++# endif
++# if defined _LIBC && defined _Mfloat_
++libm_hidden_proto(sinf)
++# endif
++
+ /* Tangent of X.  */
+ __MATHCALLI (tan,, (_Mdouble_ __x))
+ 
+@@ -111,6 +125,9 @@ __END_NAMESPACE_C99
+ _Mdouble_BEGIN_NAMESPACE
+ /* Exponential function of X.  */
+ __MATHCALLI (exp,, (_Mdouble_ __x))
++# if defined _LIBC && defined _Mlong_double_
++libm_hidden_proto(expl)
++# endif
+ 
+ /* Break VALUE into a normalized fraction and an integral power of 2.  */
+ __MATHCALLI (frexp,, (_Mdouble_ __x, int *__exponent))
+@@ -173,6 +190,9 @@ _Mdouble_END_NAMESPACE
+ __BEGIN_NAMESPACE_C99
+ /* Return `sqrt(X*X + Y*Y)'.  */
+ __MATHCALLI (hypot,, (_Mdouble_ __x, _Mdouble_ __y))
++# if defined _LIBC && defined _Mlong_double_
++libm_hidden_proto(hypotl)
++# endif
+ __END_NAMESPACE_C99
+ #endif
+ 
+@@ -298,6 +318,9 @@ __MATHCALLI (rint,, (_Mdouble_ __x))
+ 
+ /* Return X + epsilon if X < Y, X - epsilon if X > Y.  */
+ __MATHCALLX (nextafter,, (_Mdouble_ __x, _Mdouble_ __y), (__const__))
++# if defined _LIBC && defined _Mlong_double_
++libm_hidden_proto(nextafterl)
++# endif
+ # if defined __USE_ISOC99 && !defined __LDBL_COMPAT
+ __MATHCALLX (nexttoward,, (_Mdouble_ __x, long double __y), (__const__))
+ # endif
+diff --git a/libm/Makefile.in b/libm/Makefile.in
+index 7511706..d886cdb 100644
+--- a/libm/Makefile.in
++++ b/libm/Makefile.in
+@@ -75,9 +75,6 @@ libm_CSRC := \
+ 	s_remquo.c w_exp2.c \
+ 	cexp.c sincos.c
+ 
+-# Not implemented [yet?], see comment in float_wrappers.c:
+-# fdimf.o fmaf.o fmaxf.o fminf.o
+-# nearbyintf.o remquof.o scalblnf.o tgammaf.o
+ FL_MOBJ := \
+ 	acosf.o \
+ 	acoshf.o \
+@@ -98,7 +95,11 @@ FL_MOBJ := \
+ 	expf.o \
+ 	expm1f.o \
+ 	fabsf.o \
++	fdimf.o \
+ 	floorf.o \
++	fmaf.o \
++	fmaxf.o \
++	fminf.o \
+ 	fmodf.o \
+ 	frexpf.o \
+ 	gammaf.o \
+@@ -116,11 +117,14 @@ FL_MOBJ := \
+ 	lrintf.o \
+ 	lroundf.o \
+ 	modff.o \
++	nearbyintf.o \
++	nexttowardf.o \
+ 	powf.o \
+ 	remainderf.o \
++	remquof.o \
+ 	rintf.o \
+ 	roundf.o \
+-	scalbf.o \
++	scalblnf.o \
+ 	scalbnf.o \
+ 	significandf.o \
+ 	sinf.o \
+@@ -128,9 +132,24 @@ FL_MOBJ := \
+ 	sqrtf.o \
+ 	tanf.o \
+ 	tanhf.o \
++	tgammaf.o \
+ 	truncf.o \
+ 
+-# Not implemented [yet?]: nexttowardl.o
++ifeq ($(UCLIBC_SUSV3_LEGACY),y)
++FL_MOBJ += scalbf.o
++endif
++
++# Do not (yet?) implement the float variants of bessel functions
++ifeq (not-yet-implemented-$(DO_XSI_MATH),y)
++FL_MOBJ += \
++	j0f.o \
++	j1f.o \
++	jnf.o \
++	y0f.o \
++	y1f.o \
++	ynf.o
++endif
++
+ LD_MOBJ := \
+ 	__finitel.o \
+ 	__fpclassifyl.o \
+@@ -180,6 +199,7 @@ LD_MOBJ := \
+ 	modfl.o \
+ 	nearbyintl.o \
+ 	nextafterl.o \
++	nexttowardl.o \
+ 	powl.o \
+ 	remainderl.o \
+ 	remquol.o \
+@@ -196,6 +216,17 @@ LD_MOBJ := \
+ 	tgammal.o \
+ 	truncl.o \
+ 
++# Do not (yet?) implement the long double variants of bessel functions
++ifeq (not-yet-implemented-$(DO_XSI_MATH),y)
++LD_MOBJ += \
++	j0l.o \
++	j1l.o \
++	jnl.o \
++	y0l.o \
++	y1l.o \
++	ynl.o
++endif
++
+ else
+ 
+ # This list of math functions was taken from POSIX/IEEE 1003.1b-1993
+diff --git a/libm/float_wrappers.c b/libm/float_wrappers.c
+index 82b7963..105486e 100644
+--- a/libm/float_wrappers.c
++++ b/libm/float_wrappers.c
+@@ -38,19 +38,14 @@ long long func##f (float x) \
+ 	return func((double)x); \
+ }
+ 
+-
+-/* For the time being, do _NOT_ implement these functions
+- * that are defined by SuSv3 [because we don't need them
+- * and nobody asked to include them] */
+-#undef L_fdimf         /*float       fdimf(float, float);*/
+-#undef L_fmaf          /*float       fmaf(float, float, float);*/
+-#undef L_fmaxf         /*float       fmaxf(float, float);*/
+-#undef L_fminf         /*float       fminf(float, float);*/
+-#undef L_nearbyintf    /*float       nearbyintf(float);*/
+-#undef L_nexttowardf   /*float       nexttowardf(float, long double);*/
+-#undef L_remquof       /*float       remquof(float, float, int *);*/
+-#undef L_scalblnf      /*float       scalblnf(float, long);*/
+-#undef L_tgammaf       /*float       tgammaf(float);*/
++#ifndef __DO_XSI_MATH__
++# undef L_j0f	/* float j0f(float x); */
++# undef L_j1f	/* float j1f(float x); */
++# undef L_jnf	/* float jnf(int n, float x); */
++# undef L_y0f	/* float y0f(float x); */
++# undef L_y1f	/* float y1f(float x); */
++# undef L_ynf	/* float ynf(int n, float x); */
++#endif
+ 
+ /* Implement the following, as defined by SuSv3 */
+ #if 0
+@@ -155,6 +150,7 @@ float copysignf (float x, float y)
+ 
+ #ifdef L_cosf
+ WRAPPER1(cos)
++libm_hidden_def(cosf)
+ #endif
+ 
+ #ifdef L_coshf
+@@ -242,6 +238,21 @@ float hypotf (float x, float y)
+ int_WRAPPER1(ilogb)
+ #endif
+ 
++#ifdef L_j0f
++WRAPPER1(j0)
++#endif
++
++#ifdef L_j1f
++WRAPPER1(j1)
++#endif
++
++#ifdef L_jnf
++float jnf(int n, float x)
++{
++	return (float) jn(n, (double)x);
++}
++#endif
++
+ #ifdef L_ldexpf
+ float ldexpf (float x, int _exp)
+ {
+@@ -306,7 +317,7 @@ WRAPPER1(nearbyint)
+ #ifdef L_nexttowardf
+ float nexttowardf (float x, long double y)
+ {
+-	return (float) nexttoward( (double)x, (double)y );
++	return (float) nexttoward( (double)x, (long double)y );
+ }
+ #endif
+ 
+@@ -355,6 +366,7 @@ float scalbnf (float x, int _exp)
+ 
+ #ifdef L_sinf
+ WRAPPER1(sin)
++libm_hidden_def(sinf)
+ #endif
+ 
+ #ifdef L_sinhf
+@@ -381,13 +393,6 @@ WRAPPER1(tgamma)
+ WRAPPER1(trunc)
+ #endif
+ 
+-#ifdef L_fmaf
+-float fmaf (float x, float y, float z)
+-{
+-	return (float) fma( (double)x, (double)y, (double)z );
+-}
+-#endif
+-
+ #if defined L_scalbf && defined __UCLIBC_SUSV3_LEGACY__
+ float scalbf (float x, float y)
+ {
+@@ -402,3 +407,18 @@ WRAPPER1(gamma)
+ #ifdef L_significandf
+ WRAPPER1(significand)
+ #endif
++
++#ifdef L_y0f
++WRAPPER1(y0)
++#endif
++
++#ifdef L_y1f
++WRAPPER1(y1)
++#endif
++
++#ifdef L_ynf
++float ynf(int n, float x)
++{
++	return (float) yn(n, (double)x);
++}
++#endif
+diff --git a/libm/ldouble_wrappers.c b/libm/ldouble_wrappers.c
+index 118a78f..b4215cb 100644
+--- a/libm/ldouble_wrappers.c
++++ b/libm/ldouble_wrappers.c
+@@ -42,6 +42,15 @@ long long func##l(long double x) \
+ 	return func((double) x); \
+ }
+ 
++#ifndef __DO_XSI_MATH__
++# undef L_j0l  /* long double j0l(long double x); */
++# undef L_j1l  /* long double j1l(long double x); */
++# undef L_jnl  /* long double jnl(int n, long double x); */
++# undef L_y0l  /* long double y0l(long double x); */
++# undef L_y1l  /* long double y1l(long double x); */
++# undef L_ynl  /* long double ynl(int n, long double x); */
++#endif
++
+ /* Implement the following, as defined by SuSv3 */
+ #if 0
+ long double acoshl(long double);
+@@ -156,6 +165,7 @@ WRAPPER1(cosh)
+ 
+ #ifdef L_cosl
+ WRAPPER1(cos)
++libm_hidden_def(cosl)
+ #endif
+ 
+ #ifdef L_erfcl
+@@ -172,6 +182,7 @@ WRAPPER1(exp2)
+ 
+ #ifdef L_expl
+ WRAPPER1(exp)
++libm_hidden_def(expl)
+ #endif
+ 
+ #ifdef L_expm1l
+@@ -222,12 +233,28 @@ WRAPPER1(gamma)
+ 
+ #ifdef L_hypotl
+ WRAPPER2(hypot)
++libm_hidden_def(hypotl)
+ #endif
+ 
+ #ifdef L_ilogbl
+ int_WRAPPER1(ilogb)
+ #endif
+ 
++#ifdef L_j0l
++	WRAPPER1(j0)
++#endif
++
++#ifdef L_j1l
++	WRAPPER1(j1)
++#endif
++
++#ifdef L_jnl
++long double jnl(int n, long double x)
++{
++	return (long double) jn(n, (double)x);
++}
++#endif
++
+ #ifdef L_ldexpl
+ long double ldexpl (long double x, int ex)
+ {
+@@ -291,12 +318,18 @@ WRAPPER1(nearbyint)
+ 
+ #ifdef L_nextafterl
+ WRAPPER2(nextafter)
++libm_hidden_def(nextafterl)
+ #endif
+ 
+-/* Disabled in Makefile.in */
+-#if 0 /* def L_nexttowardl */
+-WRAPPER2(nexttoward)
+-libm_hidden_def(nexttowardl)
++#ifdef L_nexttowardl
++# if 0 /* TODO */
++strong_alias(nextafterl, nexttowardl)
++# else
++long double nexttowardl(long double x, long double y)
++{
++	return nextafterl(x, y);
++}
++#endif
+ #endif
+ 
+ #ifdef L_powl
+@@ -344,6 +377,7 @@ WRAPPER1(sinh)
+ 
+ #ifdef L_sinl
+ WRAPPER1(sin)
++libm_hidden_def(sinl)
+ #endif
+ 
+ #ifdef L_sqrtl
+@@ -370,6 +404,22 @@ WRAPPER1(trunc)
+ WRAPPER1(significand)
+ #endif
+ 
++#ifdef L_y0l
++WRAPPER1(y0)
++#endif
++
++#ifdef L_y1l
++WRAPPER1(y1)
++#endif
++
++#ifdef L_ynl
++long double ynl(int n, long double x)
++{
++	return (long double) yn(n, (double)x);
++}
++#endif
++
++
+ #if defined __DO_C99_MATH__ && !defined __NO_LONG_DOUBLE_MATH
+ 
+ # ifdef L___fpclassifyl
+diff --git a/libm/s_fdim.c b/libm/s_fdim.c
+index 6249219..6ed695c 100644
+--- a/libm/s_fdim.c
++++ b/libm/s_fdim.c
+@@ -6,13 +6,22 @@
+ 
+ #include "math.h"
+ #include "math_private.h"
++#include <errno.h>
+ 
+ double fdim(double x, double y)
+ {
+-  int c = __fpclassify(x);
+-  if (c == FP_NAN || c == FP_INFINITE)
+-    return HUGE_VAL;
++  int cx = __fpclassify(x); /* need both NAN and INF */
++  int cy = __fpclassify(y); /* need both NAN and INF */
++  if (cx == FP_NAN || cy == NAN)
++    return x - y;
+ 
+-  return x > y ? x - y : 0.0;
++  if (x <= y)
++	  return .0;
++
++  double z = x - y;
++  if (isinf(z) && cx != FP_INFINITE && cy != FP_INFINITE)
++	  __set_errno(ERANGE);
++
++  return z;
+ }
+ libm_hidden_def(fdim)
+diff --git a/libm/s_fmax.c b/libm/s_fmax.c
+index 21dfaa9..5f29ad8 100644
+--- a/libm/s_fmax.c
++++ b/libm/s_fmax.c
+@@ -9,10 +9,10 @@
+ 
+ double fmax(double x, double y)
+ {
+-  if (__fpclassify(x) == FP_NAN)
+-    return x;
+-  if (__fpclassify(y) == FP_NAN)
++  if (isnan(x))
+     return y;
++  if (isnan(y))
++    return x;
+ 
+   return x > y ? x : y;
+ }
+diff --git a/libm/s_fmin.c b/libm/s_fmin.c
+index 674d9a5..a549678 100644
+--- a/libm/s_fmin.c
++++ b/libm/s_fmin.c
+@@ -9,10 +9,10 @@
+ 
+ double fmin(double x, double y)
+ {
+-  if (__fpclassify(x) == FP_NAN)
+-    return x;
+-  if (__fpclassify(y) == FP_NAN)
++  if (isnan(x))
+     return y;
++  if (isnan(y))
++    return x;
+ 
+   return x < y ? x : y;
+ }
+diff --git a/libm/s_nextafter.c b/libm/s_nextafter.c
+index ee4621c..73a8ab2 100644
+--- a/libm/s_nextafter.c
++++ b/libm/s_nextafter.c
+@@ -32,7 +32,7 @@ double nextafter(double x, double y)
+ 	if(((ix>=0x7ff00000)&&((ix-0x7ff00000)|lx)!=0) ||   /* x is nan */
+ 	   ((iy>=0x7ff00000)&&((iy-0x7ff00000)|ly)!=0))     /* y is nan */
+ 	   return x+y;
+-	if(x==y) return x;		/* x=y, return x */
++	if(x==y) return y;		/* x=y, return y */
+ 	if((ix|lx)==0) {			/* x == 0 */
+ 	    INSERT_WORDS(x,hy&0x80000000,1);	/* return +-minsubnormal */
+ 	    y = x*x;
+@@ -68,3 +68,5 @@ double nextafter(double x, double y)
+ 	return x;
+ }
+ libm_hidden_def(nextafter)
++strong_alias_untyped(nextafter, nexttoward)
++libm_hidden_def(nexttoward)
+diff --git a/test/math/compile_test.c b/test/math/compile_test.c
+index ab8c40c..aedfde6 100644
+--- a/test/math/compile_test.c
++++ b/test/math/compile_test.c
+@@ -22,11 +22,11 @@ r += exp2f(float_x);
+ r += expf(float_x);
+ r += expm1f(float_x);
+ r += fabsf(float_x);
+-/*r += fdimf(float_x, float_x); - uclibc does not have it (yet?) */
++r += fdimf(float_x, float_x);
+ r += floorf(float_x);
+-/*r += fmaf(float_x, float_x, float_x); - uclibc does not have it (yet?) */
+-/*r += fmaxf(float_x, float_x); - uclibc does not have it (yet?) */
+-/*r += fminf(float_x, float_x); - uclibc does not have it (yet?) */
++r += fmaf(float_x, float_x, float_x);
++r += fmaxf(float_x, float_x);
++r += fminf(float_x, float_x);
+ r += fmodf(float_x, float_x);
+ r += frexpf(float_x, &int_x);
+ r += gammaf(float_x);
+@@ -44,17 +44,17 @@ r += logf(float_x);
+ r += lrintf(float_x);
+ r += lroundf(float_x);
+ r += modff(float_x, &float_x);
+-/*r += nearbyintf(float_x); - uclibc does not have it (yet?) */
+-/*r += nexttowardf(float_x, long_double_x); - uclibc does not have it (yet?) */
++r += nearbyintf(float_x);
++r += nexttowardf(float_x, long_double_x);
+ r += powf(float_x, float_x);
+ r += remainderf(float_x, float_x);
+-/*r += remquof(float_x, float_x, &int_x); - uclibc does not have it (yet?) */
++r += remquof(float_x, float_x, &int_x);
+ r += rintf(float_x);
+ r += roundf(float_x);
+ #ifdef __UCLIBC_SUSV3_LEGACY__
+ r += scalbf(float_x, float_x);
+ #endif
+-/*r += scalblnf(float_x, long_x); - uclibc does not have it (yet?) */
++r += scalblnf(float_x, long_x);
+ r += scalbnf(float_x, int_x);
+ r += significandf(float_x);
+ r += sinf(float_x);
+@@ -62,7 +62,7 @@ r += sinhf(float_x);
+ r += sqrtf(float_x);
+ r += tanf(float_x);
+ r += tanhf(float_x);
+-/*r += tgammaf(float_x); - uclibc does not have it (yet?) */
++r += tgammaf(float_x);
+ r += truncf(float_x);
+ return r;
+ }
+@@ -116,7 +116,7 @@ r += lroundl(long_double_x);
+ r += modfl(long_double_x, &long_double_x);
+ r += nearbyintl(long_double_x);
+ r += nextafterl(long_double_x, long_double_x);
+-/* r += nexttowardl(long_double_x, long_double_x); - uclibc doesn't provide this [yet?] */
++r += nexttowardl(long_double_x, long_double_x);
+ r += powl(long_double_x, long_double_x);
+ r += remainderl(long_double_x, long_double_x);
+ r += remquol(long_double_x, long_double_x, &int_x);
+diff --git a/test/math/libm-test.inc b/test/math/libm-test.inc
+index d0f0a0c..8f0db3c 100644
+--- a/test/math/libm-test.inc
++++ b/test/math/libm-test.inc
+@@ -115,6 +115,9 @@
+ # define _GNU_SOURCE
+ #endif
+ 
++#undef __CHK_COMPLEX_STUFF
++#define __CHK_COMPLEX_STUFF 0
++
+ #include "libm-test-ulps.h"
+ #include <complex.h>
+ #include <math.h>
+@@ -1120,8 +1123,10 @@ cacosh_test (void)
+ 
+   END (cacosh, complex);
+ }
++#endif
+ 
+ 
++#if __CHK_COMPLEX_STUFF
+ static void
+ carg_test (void)
+ {
+@@ -1188,7 +1193,9 @@ carg_test (void)
+ 
+   END (carg);
+ }
++#endif /* __CHK_COMPLEX_STUFF */
+ 
++#if 0
+ static void
+ casin_test (void)
+ {
+@@ -1683,7 +1690,7 @@ ceil_test (void)
+ }
+ 
+ 
+-#if 0
++#if __CHK_COMPLEX_STUFF
+ static void
+ cexp_test (void)
+ {
+@@ -1746,8 +1753,9 @@ cexp_test (void)
+ 
+   END (cexp, complex);
+ }
++#endif /* __CHK_COMPLEX_STUFF */
+ 
+-
++#if 0
+ static void
+ cimag_test (void)
+ {
+@@ -2588,7 +2596,6 @@ fabs_test (void)
+ }
+ 
+ 
+-#if 0
+ static void
+ fdim_test (void)
+ {
+@@ -2624,7 +2631,6 @@ fdim_test (void)
+ 
+   END (fdim);
+ }
+-#endif
+ 
+ 
+ static void
+@@ -2694,7 +2700,6 @@ floor_test (void)
+ }
+ 
+ 
+-#if 0
+ static void
+ fma_test (void)
+ {
+@@ -2797,7 +2802,6 @@ fmin_test (void)
+ 
+   END (fmin);
+ }
+-#endif
+ 
+ 
+ static void
+@@ -3002,7 +3006,7 @@ isnormal_test (void)
+   END (isnormal);
+ }
+ 
+-#if defined __DO_XSI_MATH__
++#if defined __DO_XSI_MATH__ && !(defined TEST_LDOUBLE || defined TEST_FLOAT)
+ static void
+ j0_test (void)
+ {
+@@ -3629,7 +3633,6 @@ modf_test (void)
+ }
+ 
+ 
+-#if 0
+ static void
+ nearbyint_test (void)
+ {
+@@ -3710,7 +3713,6 @@ nexttoward_test (void)
+ 
+   END (nexttoward);
+ }
+-#endif
+ 
+ 
+ static void
+@@ -3950,7 +3952,6 @@ remainder_test (void)
+   END (remainder);
+ }
+ 
+-#if 0
+ static void
+ remquo_test (void)
+ {
+@@ -3981,7 +3982,6 @@ remquo_test (void)
+ 
+   END (remquo);
+ }
+-#endif
+ 
+ static void
+ rint_test (void)
+@@ -4229,12 +4229,12 @@ round_test (void)
+ #endif
+ 
+ 
++#ifdef __UCLIBC_SUSV3_LEGACY__
+ static void
+ scalb_test (void)
+ {
+   START (scalb);
+ #ifndef TEST_LDOUBLE /* uclibc doesn't have scalbl */
+-#ifdef __UCLIBC_SUSV3_LEGACY__ /* scalbf is susv3 legacy */
+ 
+   TEST_ff_f (scalb, 2.0, 0.5, nan_value, INVALID_EXCEPTION);
+   TEST_ff_f (scalb, 3.0, -2.5, nan_value, INVALID_EXCEPTION);
+@@ -4285,11 +4285,10 @@ scalb_test (void)
+ 
+   TEST_ff_f (scalb, 0.8L, 4, 12.8L);
+   TEST_ff_f (scalb, -0.854375L, 5, -27.34L);
+-#endif /* __UCLIBC_SUSV3_LEGACY__ */
+ #endif /* TEST_LDOUBLE */
+   END (scalb);
+ }
+-
++#endif
+ 
+ static void
+ scalbn_test (void)
+@@ -4313,7 +4312,6 @@ scalbn_test (void)
+ }
+ 
+ 
+-#if 0
+ static void
+ scalbln_test (void)
+ {
+@@ -4334,7 +4332,6 @@ scalbln_test (void)
+ 
+   END (scalbn);
+ }
+-#endif
+ 
+ 
+ static void
+@@ -4539,7 +4536,6 @@ tanh_test (void)
+   END (tanh);
+ }
+ 
+-#if 0
+ static void
+ tgamma_test (void)
+ {
+@@ -4571,7 +4567,6 @@ tgamma_test (void)
+ 
+   END (tgamma);
+ }
+-#endif
+ 
+ 
+ #if 0
+@@ -4651,7 +4646,7 @@ trunc_test (void)
+ }
+ #endif
+ 
+-#if defined __DO_XSI_MATH__
++#if defined __DO_XSI_MATH__ && !(defined TEST_LDOUBLE || defined TEST_FLOAT)
+ static void
+ y0_test (void)
+ {
+@@ -4979,11 +4974,11 @@ main (int argc, char **argv)
+   logb_test ();
+   modf_test ();
+   ilogb_test ();
++#ifdef __UCLIBC_SUSV3_LEGACY__
+   scalb_test ();
++#endif
+   scalbn_test ();
+-#if 0
+   scalbln_test ();
+-#endif
+   significand_test ();
+ 
+   /* Power and absolute value functions:  */
+@@ -4998,16 +4993,12 @@ main (int argc, char **argv)
+   erfc_test ();
+   gamma_test ();
+   lgamma_test ();
+-#if 0
+   tgamma_test ();
+-#endif
+ 
+   /* Nearest integer functions:  */
+   ceil_test ();
+   floor_test ();
+-#if 0
+   nearbyint_test ();
+-#endif
+   rint_test ();
+ #if 0
+   rint_test_tonearest ();
+@@ -5025,13 +5016,10 @@ main (int argc, char **argv)
+   /* Remainder functions:  */
+   fmod_test ();
+   remainder_test ();
+-#if 0
+   remquo_test ();
+-#endif
+ 
+   /* Manipulation functions:  */
+   copysign_test ();
+-#if 0
+   nextafter_test ();
+   nexttoward_test ();
+ 
+@@ -5043,24 +5031,29 @@ main (int argc, char **argv)
+   /* Multiply and add:  */
+   fma_test ();
+ 
++
+   /* Complex functions:  */
+   cabs_test ();
++#if __CHK_COMPLEX_STUFF
++#if 0
+   cacos_test ();
+   cacosh_test ();
++#endif
+   carg_test ();
++#if 0
+   casin_test ();
+   casinh_test ();
+   catan_test ();
+   catanh_test ();
+   ccos_test ();
+   ccosh_test ();
++#endif
+   cexp_test ();
++#if 0
+   cimag_test ();
+   clog10_test ();
+   clog_test ();
+-#if 0
+   conj_test ();
+-#endif
+   cpow_test ();
+   cproj_test ();
+   creal_test ();
+@@ -5070,9 +5063,10 @@ main (int argc, char **argv)
+   ctan_test ();
+   ctanh_test ();
+ #endif
++#endif /* __CHK_COMPLEX_STUFF */
+ 
+   /* Bessel functions:  */
+-#if defined __DO_XSI_MATH__
++#if defined __DO_XSI_MATH__ && !(defined TEST_LDOUBLE || defined TEST_FLOAT)
+   j0_test ();
+   j1_test ();
+   jn_test ();
+--
+cgit v0.9.1
diff --git a/package/uclibc/0.9.33.2/uclibc-0070-libc-add-get-set-swap-make-context-user-context-mani.patch b/package/uclibc/0.9.33.2/uclibc-0070-libc-add-get-set-swap-make-context-user-context-mani.patch
new file mode 100644
index 0000000..c955b00
--- /dev/null
+++ b/package/uclibc/0.9.33.2/uclibc-0070-libc-add-get-set-swap-make-context-user-context-mani.patch
@@ -0,0 +1,2550 @@
+From a8dc90eaaa5e6474beac828558d969b1aafee4af Mon Sep 17 00:00:00 2001
+From: Florian Fainelli <florian@openwrt.org>
+Date: Wed, 9 Jan 2013 16:17:21 +0100
+Subject: [PATCH] libc: add {get,set,swap,make}context user context
+ manipulation functions
+
+Add the obsolescent SUSv3 family of user context manipulating functions
+for arm, i386, mips, x86_64.
+
+Signed-off-by: Timon ter Braak <timonterbraak@gmail.com>
+Signed-off-by: Florian Fainelli <florian@openwrt.org>
+Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
+Signed-off-by: Natanael Copa <ncopa@alpinelinux.org>
+Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
+---
+ Rules.mak                                          |   2 +
+ extra/Configs/Config.arm                           |   1 +
+ extra/Configs/Config.i386                          |   1 +
+ extra/Configs/Config.in                            |  16 ++
+ extra/Configs/Config.mips                          |   1 +
+ extra/Configs/Config.x86_64                        |   1 +
+ include/ucontext.h                                 |  32 +++-
+ libc/.gitignore                                    |   1 +
+ libc/sysdeps/linux/Makefile.commonarch             |  20 +-
+ libc/sysdeps/linux/arm/Makefile.arch               |   5 +
+ libc/sysdeps/linux/arm/getcontext.S                |  80 ++++++++
+ libc/sysdeps/linux/arm/makecontext.c               |  73 +++++++
+ libc/sysdeps/linux/arm/setcontext.S                |  76 ++++++++
+ libc/sysdeps/linux/arm/swapcontext.S               |  63 ++++++
+ libc/sysdeps/linux/arm/ucontext_i.sym              |  30 +++
+ libc/sysdeps/linux/i386/Makefile.arch              |   4 +
+ libc/sysdeps/linux/i386/getcontext.S               |  84 ++++++++
+ libc/sysdeps/linux/i386/makecontext.S              | 123 ++++++++++++
+ libc/sysdeps/linux/i386/setcontext.S               |  96 ++++++++++
+ libc/sysdeps/linux/i386/swapcontext.S              | 110 +++++++++++
+ libc/sysdeps/linux/i386/ucontext_i.sym             |  30 +++
+ libc/sysdeps/linux/mips/Makefile.arch              |   4 +
+ libc/sysdeps/linux/mips/getcontext.S               | 148 +++++++++++++++
+ libc/sysdeps/linux/mips/kernel_rt_sigframe.h       |  10 +
+ libc/sysdeps/linux/mips/makecontext.S              | 188 ++++++++++++++++++
+ libc/sysdeps/linux/mips/setcontext.S               | 191 +++++++++++++++++++
+ libc/sysdeps/linux/mips/swapcontext.S              | 211 +++++++++++++++++++++
+ libc/sysdeps/linux/mips/ucontext_i.sym             |  52 +++++
+ libc/sysdeps/linux/x86_64/Makefile.arch            |   5 +
+ libc/sysdeps/linux/x86_64/__start_context.S        |  49 +++++
+ libc/sysdeps/linux/x86_64/getcontext.S             |  88 +++++++++
+ libc/sysdeps/linux/x86_64/makecontext.c            | 121 ++++++++++++
+ libc/sysdeps/linux/x86_64/setcontext.S             | 103 ++++++++++
+ libc/sysdeps/linux/x86_64/swapcontext.S            | 121 ++++++++++++
+ libc/sysdeps/linux/x86_64/ucontext_i.sym           |  37 ++++
+ libpthread/nptl/sysdeps/Makefile.commonarch        |   3 +-
+ .../sysdeps/unix/sysv/linux/Makefile.commonarch    |   2 -
+ 37 files changed, 2174 insertions(+), 8 deletions(-)
+ create mode 100644 libc/.gitignore
+ create mode 100644 libc/sysdeps/linux/arm/getcontext.S
+ create mode 100644 libc/sysdeps/linux/arm/makecontext.c
+ create mode 100644 libc/sysdeps/linux/arm/setcontext.S
+ create mode 100644 libc/sysdeps/linux/arm/swapcontext.S
+ create mode 100644 libc/sysdeps/linux/arm/ucontext_i.sym
+ create mode 100644 libc/sysdeps/linux/i386/getcontext.S
+ create mode 100644 libc/sysdeps/linux/i386/makecontext.S
+ create mode 100644 libc/sysdeps/linux/i386/setcontext.S
+ create mode 100644 libc/sysdeps/linux/i386/swapcontext.S
+ create mode 100644 libc/sysdeps/linux/i386/ucontext_i.sym
+ create mode 100644 libc/sysdeps/linux/mips/getcontext.S
+ create mode 100644 libc/sysdeps/linux/mips/kernel_rt_sigframe.h
+ create mode 100644 libc/sysdeps/linux/mips/makecontext.S
+ create mode 100644 libc/sysdeps/linux/mips/setcontext.S
+ create mode 100644 libc/sysdeps/linux/mips/swapcontext.S
+ create mode 100644 libc/sysdeps/linux/mips/ucontext_i.sym
+ create mode 100644 libc/sysdeps/linux/x86_64/__start_context.S
+ create mode 100644 libc/sysdeps/linux/x86_64/getcontext.S
+ create mode 100644 libc/sysdeps/linux/x86_64/makecontext.c
+ create mode 100644 libc/sysdeps/linux/x86_64/setcontext.S
+ create mode 100644 libc/sysdeps/linux/x86_64/swapcontext.S
+ create mode 100644 libc/sysdeps/linux/x86_64/ucontext_i.sym
+
+diff --git a/Rules.mak b/Rules.mak
+index 96871e1..8943fbf 100644
+--- a/Rules.mak
++++ b/Rules.mak
+@@ -813,3 +813,5 @@ SHARED_END_FILES:=$(LIBGCC_DIR)crtendS.o $(top_builddir)lib/crtn.o
+ endif
+ 
+ LOCAL_INSTALL_PATH := install_dir
++
++PTHREAD_GENERATE_MANGLE ?= -n "s/^.*@@@name@@@\([^@]*\)@@@value@@@[^0-9Xxa-fA-F-]*\([0-9Xxa-fA-F-][0-9Xxa-fA-F-]*\).*@@@end@@@.*\$$/\#define \1 \2/p"
+diff --git a/extra/Configs/Config.arm b/extra/Configs/Config.arm
+index 0bb2971..dc53643 100644
+--- a/extra/Configs/Config.arm
++++ b/extra/Configs/Config.arm
+@@ -11,6 +11,7 @@ config FORCE_OPTIONS_FOR_ARCH
+ 	bool
+ 	default y
+ 	select ARCH_ANY_ENDIAN
++	select ARCH_HAS_UCONTEXT
+ 
+ config CONFIG_ARM_EABI
+ 	bool "Build for EABI"
+diff --git a/extra/Configs/Config.i386 b/extra/Configs/Config.i386
+index 288aa5e..92cee3b 100644
+--- a/extra/Configs/Config.i386
++++ b/extra/Configs/Config.i386
+@@ -12,6 +12,7 @@ config FORCE_OPTIONS_FOR_ARCH
+ 	default y
+ 	select ARCH_LITTLE_ENDIAN
+ 	select ARCH_HAS_MMU
++	select ARCH_HAS_UCONTEXT
+ 
+ choice
+ 	prompt "Target x86 Processor Family"
+diff --git a/extra/Configs/Config.in b/extra/Configs/Config.in
+index 4bb6812..62bcd9b 100644
+--- a/extra/Configs/Config.in
++++ b/extra/Configs/Config.in
+@@ -261,6 +261,9 @@ config ARCH_HAS_NO_LDSO
+ 	bool
+ 	select ARCH_HAS_NO_SHARED
+ 
++config ARCH_HAS_UCONTEXT
++	bool
++
+ config HAVE_SHARED
+ 	bool "Enable shared libraries"
+ 	depends on !ARCH_HAS_NO_SHARED
+@@ -678,6 +681,19 @@ config UCLIBC_SUSV3_LEGACY
+ 
+ 	  WARNING! ABI incompatibility.
+ 
++config UCLIBC_HAS_CONTEXT_FUNCS
++	bool "Use obsolescent context control functions"
++	depends on UCLIBC_SUSV3_LEGACY && ARCH_HAS_UCONTEXT
++	help
++	  Add into library the SuSv3 obsolescent functions used for context
++	  control. The setcontext family allows the implementation in C of
++	  advanced control flow patterns such as iterators, fibers, and
++	  coroutines. They may be viewed as an advanced version of
++	  setjmp/longjmp; whereas the latter allows only a single non-local jump
++	  up the stack, setcontext allows the creation of multiple cooperative
++	  threads of control, each with its own stack.
++	  These functions are: setcontext, getcontext, makecontext, swapcontext.
++
+ config UCLIBC_SUSV3_LEGACY_MACROS
+ 	bool "Enable SuSv3 LEGACY macros"
+ 	help
+diff --git a/extra/Configs/Config.mips b/extra/Configs/Config.mips
+index 063b07c..48e0b64 100644
+--- a/extra/Configs/Config.mips
++++ b/extra/Configs/Config.mips
+@@ -11,6 +11,7 @@ config FORCE_OPTIONS_FOR_ARCH
+ 	bool
+ 	default y
+ 	select ARCH_ANY_ENDIAN
++	select ARCH_HAS_UCONTEXT
+ 
+ choice
+ 	prompt "Target ABI"
+diff --git a/extra/Configs/Config.x86_64 b/extra/Configs/Config.x86_64
+index 1b28088..4c8c3a9 100644
+--- a/extra/Configs/Config.x86_64
++++ b/extra/Configs/Config.x86_64
+@@ -12,3 +12,4 @@ config FORCE_OPTIONS_FOR_ARCH
+ 	default y
+ 	select ARCH_LITTLE_ENDIAN
+ 	select ARCH_HAS_MMU
++	select ARCH_HAS_UCONTEXT
+diff --git a/include/ucontext.h b/include/ucontext.h
+index 14a1270..f11db77 100644
+--- a/include/ucontext.h
++++ b/include/ucontext.h
+@@ -15,17 +15,43 @@
+    License along with the GNU C Library; if not, see
+    <http://www.gnu.org/licenses/>.  */
+ 
++/* The System V ABI user-level context switching support functions
++   are marked obsolescent by SuSv3.  */
++
+ #ifndef _UCONTEXT_H
+ #define _UCONTEXT_H	1
+ 
+ #include <features.h>
+ 
++#ifdef __UCLIBC_HAS_CONTEXT_FUNCS__
++
+ /* Get machine dependent definition of data structures.  */
+ #include <sys/ucontext.h>
+ 
+-/* The System V ABI user-level context switching support functions
+- * are marked obsolescent by SuSv3, and are not implemented by
+- * uClibc.  This header is therefore empty.  */
++__BEGIN_DECLS
++
++/* Get user context and store it in variable pointed to by UCP.  */
++extern int getcontext (ucontext_t *__ucp) __THROW;
++
++/* Set user context from information of variable pointed to by UCP.  */
++extern int setcontext (const ucontext_t *__ucp) __THROW;
++
++/* Save current context in context variable pointed to by OUCP and set
++   context from variable pointed to by UCP.  */
++extern int swapcontext (ucontext_t *__restrict __oucp,
++			const ucontext_t *__restrict __ucp) __THROW;
++
++/* Manipulate user context UCP to continue with calling functions FUNC
++   and the ARGC-1 parameters following ARGC when the context is used
++   the next time in `setcontext' or `swapcontext'.
++
++   We cannot say anything about the parameters FUNC takes; `void'
++   is as good as any other choice.  */
++extern void makecontext (ucontext_t *__ucp, void (*__func) (void),
++			 int __argc, ...) __THROW;
++
++__END_DECLS
+ 
++#endif
+ 
+ #endif /* ucontext.h */
+diff --git a/libc/.gitignore b/libc/.gitignore
+new file mode 100644
+index 0000000..f4c0305
+--- /dev/null
++++ b/libc/.gitignore
+@@ -0,0 +1 @@
++ucontext_i.[chs]
+diff --git a/libc/sysdeps/linux/Makefile.commonarch b/libc/sysdeps/linux/Makefile.commonarch
+index c1bc5df..ac89e72 100644
+--- a/libc/sysdeps/linux/Makefile.commonarch
++++ b/libc/sysdeps/linux/Makefile.commonarch
+@@ -37,5 +37,23 @@ headers-y += $(ARCH_HEADERS_OUT)
+ headers_clean-y += HEADERCLEAN_$(subst $(top_builddir),,$(ARCH_OUT))
+ HEADERCLEAN_$(subst $(top_builddir),,$(ARCH_OUT)):
+ 	$(do_rm) $(ARCH_HEADERS_OUT)
+-
+ endif
++
++CFLAGS-ucontext_i.c = -S
++
++$(ARCH_OUT)/ucontext_i.c: $(ARCH_DIR)/ucontext_i.sym
++	$(do_awk) $(top_srcdir)extra/scripts/gen-as-const.awk $< > $@
++
++$(ARCH_OUT)/ucontext_i.s: $(ARCH_OUT)/ucontext_i.c
++	$(compile.c)
++
++$(ARCH_OUT)/ucontext_i.h: $(ARCH_OUT)/ucontext_i.s
++	$(do_sed) $(PTHREAD_GENERATE_MANGLE) $< > $@
++
++pregen-headers-$(UCLIBC_HAS_CONTEXT_FUNCS) += $(ARCH_OUT)/ucontext_i.h
++
++headers_clean-$(UCLIBC_HAS_CONTEXT_FUNCS) += \
++	HEADERCLEAN_$(subst $(top_builddir),,$(ARCH_OUT)/ucontext_i)
++
++HEADERCLEAN_$(subst $(top_builddir),,$(ARCH_OUT)/ucontext_i):
++	$(do_rm) $(addprefix $(ARCH_OUT)/ucontext_i., c h s)
+diff --git a/libc/sysdeps/linux/arm/Makefile.arch b/libc/sysdeps/linux/arm/Makefile.arch
+index 5fc3e54..36d988b 100644
+--- a/libc/sysdeps/linux/arm/Makefile.arch
++++ b/libc/sysdeps/linux/arm/Makefile.arch
+@@ -43,3 +43,8 @@ libc-static-y += $(ARCH_OUT)/aeabi_lcsts.o $(ARCH_OUT)/aeabi_math.o \
+ libc-nonshared-y += $(ARCH_OUT)/aeabi_lcsts.os $(ARCH_OUT)/aeabi_math.os \
+ 	$(ARCH_OUT)/aeabi_sighandlers.os $(ARCH_OUT)/aeabi_unwind_cpp_pr1.o
+ endif
++
++ifeq ($(UCLIBC_HAS_CONTEXT_FUNCS),y)
++CSRC += makecontext.c
++SSRC += getcontext.S setcontext.S swapcontext.S
++endif
+diff --git a/libc/sysdeps/linux/arm/getcontext.S b/libc/sysdeps/linux/arm/getcontext.S
+new file mode 100644
+index 0000000..a987c52
+--- /dev/null
++++ b/libc/sysdeps/linux/arm/getcontext.S
+@@ -0,0 +1,80 @@
++/* Copyright (C) 2012 Free Software Foundation, Inc.
++   This file is part of the GNU C Library.
++
++   The GNU C Library is free software; you can redistribute it and/or
++   modify it under the terms of the GNU Lesser General Public
++   License as published by the Free Software Foundation; either
++   version 2.1 of the License, or (at your option) any later version.
++
++   The GNU C Library is distributed in the hope that it will be useful,
++   but WITHOUT ANY WARRANTY; without even the implied warranty of
++   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
++   Lesser General Public License for more details.
++
++   You should have received a copy of the GNU Lesser General Public
++   License along with the GNU C Library; if not, see
++   <http://www.gnu.org/licenses/>.  */
++
++#include <sysdep.h>
++
++#include "ucontext_i.h"
++
++	.syntax unified
++	.text
++
++/* int getcontext (ucontext_t *ucp) */
++
++ENTRY(__getcontext)
++	/* No need to save r0-r3, d0-d7, or d16-d31.  */
++	add	r1, r0, #MCONTEXT_ARM_R4
++	stmia   r1, {r4-r11}
++
++	/* Save R13 separately as Thumb can't STM it.  */
++	str     r13, [r0, #MCONTEXT_ARM_SP]
++	str     r14, [r0, #MCONTEXT_ARM_LR]
++	/* Return to LR */
++	str     r14, [r0, #MCONTEXT_ARM_PC]
++	/* Return zero */
++	mov     r2, #0
++	str     r2, [r0, #MCONTEXT_ARM_R0]
++
++	/* Save ucontext_t * across the next call.  */
++	mov	r4, r0
++
++	/* __sigprocmask(SIG_BLOCK, NULL, &(ucontext->uc_sigmask)) */
++	mov     r0, #SIG_BLOCK
++	mov     r1, #0
++	add     r2, r4, #UCONTEXT_SIGMASK
++	bl      PLTJMP(sigprocmask)
++
++#if defined __UCLIBC_HAS_FLOATS__ && ! defined __UCLIBC_HAS_SOFT_FLOAT__
++# ifdef __VFP_FP__
++	/* Store the VFP registers.  */
++	/* Following instruction is fstmiax ip!, {d8-d15}.  */
++	stc     p11, cr8, [r0], #64
++	/* Store the floating-point status register.  */
++	/* Following instruction is fmrx r2, fpscr.  */
++	mrc     p10, 7, r1, cr1, cr0, 0
++	str     r1, [r0], #4
++# endif
++#endif
++#ifdef __IWMMXT__
++	/* Save the call-preserved iWMMXt registers.  */
++	/* Following instructions are wstrd wr10, [r0], #8 (etc.)  */
++	stcl    p1, cr10, [r0], #8
++	stcl    p1, cr11, [r0], #8
++	stcl    p1, cr12, [r0], #8
++	stcl    p1, cr13, [r0], #8
++	stcl    p1, cr14, [r0], #8
++	stcl    p1, cr15, [r0], #8
++#endif
++
++	/* Restore the clobbered R4 and LR.  */
++	ldr	r14, [r4, #MCONTEXT_ARM_LR]
++	ldr	r4, [r4, #MCONTEXT_ARM_R4]
++
++	mov	r0, #0
++	DO_RET(r14)
++
++END(__getcontext)
++weak_alias(__getcontext, getcontext)
+diff --git a/libc/sysdeps/linux/arm/makecontext.c b/libc/sysdeps/linux/arm/makecontext.c
+new file mode 100644
+index 0000000..d6ae6f0
+--- /dev/null
++++ b/libc/sysdeps/linux/arm/makecontext.c
+@@ -0,0 +1,73 @@
++/* Copyright (C) 2012 Free Software Foundation, Inc.
++   This file is part of the GNU C Library.
++
++   The GNU C Library is free software; you can redistribute it and/or
++   modify it under the terms of the GNU Lesser General Public
++   License as published by the Free Software Foundation; either
++   version 2.1 of the License, or (at your option) any later version.
++
++   The GNU C Library is distributed in the hope that it will be useful,
++   but WITHOUT ANY WARRANTY; without even the implied warranty of
++   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
++   Lesser General Public License for more details.
++
++   You should have received a copy of the GNU Lesser General Public
++   License along with the GNU C Library; if not, see
++   <http://www.gnu.org/licenses/>.  */
++
++#include <stdarg.h>
++#include <ucontext.h>
++
++/* Number of arguments that go in registers.  */
++#define NREG_ARGS  4
++
++/* Take a context previously prepared via getcontext() and set to
++   call func() with the given int only args.  */
++void
++__makecontext (ucontext_t *ucp, void (*func) (void), int argc, ...)
++{
++  extern void __startcontext (void);
++  unsigned long *funcstack;
++  va_list vl;
++  unsigned long *regptr;
++  unsigned int reg;
++  int misaligned;
++
++  /* Start at the top of stack.  */
++  funcstack = (unsigned long *) (ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size);
++
++  /* Ensure the stack stays eight byte aligned.  */
++  misaligned = ((unsigned long) funcstack & 4) != 0;
++
++  if ((argc > NREG_ARGS) && (argc & 1) != 0)
++    misaligned = !misaligned;
++
++  if (misaligned)
++    funcstack -= 1;
++
++  va_start (vl, argc);
++
++  /* Reserve space for the on-stack arguments.  */
++  if (argc > NREG_ARGS)
++    funcstack -= (argc - NREG_ARGS);
++
++  ucp->uc_mcontext.arm_sp = (unsigned long) funcstack;
++  ucp->uc_mcontext.arm_pc = (unsigned long) func;
++
++  /* Exit to startcontext() with the next context in R4 */
++  ucp->uc_mcontext.arm_r4 = (unsigned long) ucp->uc_link;
++  ucp->uc_mcontext.arm_lr = (unsigned long) __startcontext;
++
++  /* The first four arguments go into registers.  */
++  regptr = &(ucp->uc_mcontext.arm_r0);
++
++  for (reg = 0; (reg < argc) && (reg < NREG_ARGS); reg++)
++    *regptr++ = va_arg (vl, unsigned long);
++
++  /* And the remainder on the stack.  */
++  for (; reg < argc; reg++)
++    *funcstack++ = va_arg (vl, unsigned long);
++
++  va_end (vl);
++}
++weak_alias (__makecontext, makecontext)
+diff --git a/libc/sysdeps/linux/arm/setcontext.S b/libc/sysdeps/linux/arm/setcontext.S
+new file mode 100644
+index 0000000..a5c33a0
+--- /dev/null
++++ b/libc/sysdeps/linux/arm/setcontext.S
+@@ -0,0 +1,76 @@
++/* Copyright (C) 2012 Free Software Foundation, Inc.
++   This file is part of the GNU C Library.
++
++   The GNU C Library is free software; you can redistribute it and/or
++   modify it under the terms of the GNU Lesser General Public
++   License as published by the Free Software Foundation; either
++   version 2.1 of the License, or (at your option) any later version.
++
++   The GNU C Library is distributed in the hope that it will be useful,
++   but WITHOUT ANY WARRANTY; without even the implied warranty of
++   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
++   Lesser General Public License for more details.
++
++   You should have received a copy of the GNU Lesser General Public
++   License along with the GNU C Library; if not, see
++   <http://www.gnu.org/licenses/>.  */
++
++#include <sysdep.h>
++
++#include "ucontext_i.h"
++
++	.syntax unified
++	.text
++
++/* int setcontext (const ucontext_t *ucp) */
++
++ENTRY(__setcontext)
++	mov	r4, r0
++
++#if defined __UCLIBC_HAS_FLOATS__ && ! defined __UCLIBC_HAS_SOFT_FLOAT__
++# ifdef __VFP_FP__
++	/* Following instruction is vldmia r0!, {d8-d15}.  */
++	ldc     p11, cr8, [r0], #64
++	/* Restore the floating-point status register.  */
++	ldr     r1, [r0], #4
++	/* Following instruction is fmxr fpscr, r1.  */
++	mcr     p10, 7, r1, cr1, cr0, 0
++# endif
++#endif
++
++#ifdef __IWMMXT__
++	/* Restore the call-preserved iWMMXt registers.  */
++	/* Following instructions are wldrd wr10, [r0], #8 (etc.)  */
++	ldcl    p1, cr10, [r0], #8
++	ldcl    p1, cr11, [r0], #8
++	ldcl    p1, cr12, [r0], #8
++	ldcl    p1, cr13, [r0], #8
++	ldcl    p1, cr14, [r0], #8
++	ldcl    p1, cr15, [r0], #8
++#endif
++
++	/* Now bring back the signal status.  */
++	mov	r0, #SIG_SETMASK
++	add	r1, r4, #UCONTEXT_SIGMASK
++	mov	r2, #0
++	bl	PLTJMP(sigprocmask)
++
++        /* Loading r0-r3 makes makecontext easier.  */
++        add     r14, r4, #MCONTEXT_ARM_R0
++        ldmia   r14, {r0-r11}
++        ldr     r13, [r14, #(MCONTEXT_ARM_SP - MCONTEXT_ARM_R0)]
++        add     r14, r14, #(MCONTEXT_ARM_LR - MCONTEXT_ARM_R0)
++        ldmia   r14, {r14, pc}
++
++END(setcontext)
++weak_alias(__setcontext, setcontext)
++
++	/* Called when a makecontext() context returns.  Start the
++	   context in R4 or fall through to exit().  */
++ENTRY(__startcontext)
++        movs    r0, r4
++        bne     PLTJMP(__setcontext)
++
++        @ New context was 0 - exit
++        b       PLTJMP(_exit)
++END(__startcontext)
+diff --git a/libc/sysdeps/linux/arm/swapcontext.S b/libc/sysdeps/linux/arm/swapcontext.S
+new file mode 100644
+index 0000000..ba6e31c
+--- /dev/null
++++ b/libc/sysdeps/linux/arm/swapcontext.S
+@@ -0,0 +1,63 @@
++/* Copyright (C) 2012 Free Software Foundation, Inc.
++   This file is part of the GNU C Library.
++
++   The GNU C Library is free software; you can redistribute it and/or
++   modify it under the terms of the GNU Lesser General Public
++   License as published by the Free Software Foundation; either
++   version 2.1 of the License, or (at your option) any later version.
++
++   The GNU C Library is distributed in the hope that it will be useful,
++   but WITHOUT ANY WARRANTY; without even the implied warranty of
++   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
++   Lesser General Public License for more details.
++
++   You should have received a copy of the GNU Lesser General Public
++   License along with the GNU C Library; if not, see
++   <http://www.gnu.org/licenses/>.  */
++
++#include <sysdep.h>
++
++#include "ucontext_i.h"
++
++	.syntax unified
++	.text
++
++/* int swapcontext (ucontext_t *oucp, const ucontext_t *ucp) */
++
++ENTRY(swapcontext)
++
++	/* Have getcontext() do most of the work then fix up
++	   LR afterwards.  Save R3 to keep the stack aligned.  */
++	push	{r0,r1,r3,r14}
++	cfi_adjust_cfa_offset (16)
++	cfi_rel_offset (r0,0)
++	cfi_rel_offset (r1,4)
++	cfi_rel_offset (r3,8)
++	cfi_rel_offset (r14,12)
++
++	bl	__getcontext
++	mov	r4, r0
++
++	pop	{r0,r1,r3,r14}
++	cfi_adjust_cfa_offset (-16)
++	cfi_restore (r0)
++	cfi_restore (r1)
++	cfi_restore (r3)
++	cfi_restore (r14)
++
++	/* Exit if getcontext() failed.  */
++	cmp 	r4, #0
++	itt	ne
++	movne	r0, r4
++	RETINSTR(ne, r14)
++
++	/* Fix up LR and the PC.  */
++	str	r13,[r0, #MCONTEXT_ARM_SP]
++	str	r14,[r0, #MCONTEXT_ARM_LR]
++	str	r14,[r0, #MCONTEXT_ARM_PC]
++
++	/* And swap using swapcontext().  */
++	mov	r0, r1
++	b	__setcontext
++
++END(swapcontext)
+diff --git a/libc/sysdeps/linux/arm/ucontext_i.sym b/libc/sysdeps/linux/arm/ucontext_i.sym
+new file mode 100644
+index 0000000..9650322
+--- /dev/null
++++ b/libc/sysdeps/linux/arm/ucontext_i.sym
+@@ -0,0 +1,30 @@
++#include <inttypes.h>
++#include <signal.h>
++#include <stddef.h>
++#include <sys/ucontext.h>
++
++SIG_BLOCK
++SIG_SETMASK
++
++-- Offsets of the fields in the ucontext_t structure.
++#define ucontext(member)	offsetof (ucontext_t, member)
++#define mcontext(member)	ucontext (uc_mcontext.member)
++
++UCONTEXT_FLAGS			ucontext (uc_flags)
++UCONTEXT_LINK			ucontext (uc_link)
++UCONTEXT_STACK			ucontext (uc_stack)
++UCONTEXT_MCONTEXT		ucontext (uc_mcontext)
++UCONTEXT_SIGMASK		ucontext (uc_sigmask)
++
++UCONTEXT_REGSPACE		ucontext (uc_regspace)
++
++MCONTEXT_TRAP_NO		mcontext (trap_no)
++MCONTEXT_ERROR_CODE		mcontext (error_code)
++MCONTEXT_OLDMASK		mcontext (oldmask)
++MCONTEXT_ARM_R0		mcontext (arm_r0)
++MCONTEXT_ARM_R4		mcontext (arm_r4)
++MCONTEXT_ARM_SP		mcontext (arm_sp)
++MCONTEXT_ARM_LR		mcontext (arm_lr)
++MCONTEXT_ARM_PC		mcontext (arm_pc)
++MCONTEXT_ARM_CPSR		mcontext (arm_cpsr)
++MCONTEXT_FAULT_ADDRESS		mcontext (fault_address)
+diff --git a/libc/sysdeps/linux/i386/Makefile.arch b/libc/sysdeps/linux/i386/Makefile.arch
+index a3bf32f..e7fd28e 100644
+--- a/libc/sysdeps/linux/i386/Makefile.arch
++++ b/libc/sysdeps/linux/i386/Makefile.arch
+@@ -18,3 +18,7 @@ endif
+ ifneq ($(UCLIBC_HAS_THREADS_NATIVE),y)
+ SSRC += vfork.S clone.S
+ endif
++
++ifeq ($(UCLIBC_HAS_CONTEXT_FUNCS),y)
++SSRC += makecontext.S setcontext.S getcontext.S swapcontext.S
++endif
+diff --git a/libc/sysdeps/linux/i386/getcontext.S b/libc/sysdeps/linux/i386/getcontext.S
+new file mode 100644
+index 0000000..3221b59
+--- /dev/null
++++ b/libc/sysdeps/linux/i386/getcontext.S
+@@ -0,0 +1,84 @@
++/* Save current context.
++   Copyright (C) 2001-2012 Free Software Foundation, Inc.
++   This file is part of the GNU C Library.
++   Contributed by Ulrich Drepper <drepper@redhat.com>, 2001.
++
++   The GNU C Library is free software; you can redistribute it and/or
++   modify it under the terms of the GNU Lesser General Public
++   License as published by the Free Software Foundation; either
++   version 2.1 of the License, or (at your option) any later version.
++
++   The GNU C Library is distributed in the hope that it will be useful,
++   but WITHOUT ANY WARRANTY; without even the implied warranty of
++   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
++   Lesser General Public License for more details.
++
++   You should have received a copy of the GNU Lesser General Public
++   License along with the GNU C Library; if not, see
++   <http://www.gnu.org/licenses/>.  */
++
++#include <sysdep.h>
++
++#include "ucontext_i.h"
++
++
++ENTRY(__getcontext)
++	/* Load address of the context data structure.  */
++	movl	4(%esp), %eax
++
++	/* Return value of getcontext.  EAX is the only register whose
++	   value is not preserved.  */
++	movl	$0, oEAX(%eax)
++
++	/* Save the 32-bit register values and the return address.  */
++	movl	%ecx, oECX(%eax)
++	movl	%edx, oEDX(%eax)
++	movl	%edi, oEDI(%eax)
++	movl	%esi, oESI(%eax)
++	movl	%ebp, oEBP(%eax)
++	movl	(%esp), %ecx
++	movl	%ecx, oEIP(%eax)
++	leal	4(%esp), %ecx		/* Exclude the return address.  */
++	movl	%ecx, oESP(%eax)
++	movl	%ebx, oEBX(%eax)
++
++	/* Save the FS segment register.  We don't touch the GS register
++	   since it is used for threads.  */
++	xorl	%edx, %edx
++	movw	%fs, %dx
++	movl	%edx, oFS(%eax)
++
++	/* We have separate floating-point register content memory on the
++	   stack.  We use the __fpregs_mem block in the context.  Set the
++	   links up correctly.  */
++	leal	oFPREGSMEM(%eax), %ecx
++	movl	%ecx, oFPREGS(%eax)
++	/* Save the floating-point context.  */
++	fnstenv	(%ecx)
++	/* And load it right back since the processor changes the mask.
++	   Intel thought this opcode to be used in interrupt handlers which
++	   would block all exceptions.  */
++	fldenv	(%ecx)
++
++	/* Save the current signal mask.  */
++	pushl	%ebx
++	cfi_adjust_cfa_offset (4)
++	cfi_rel_offset (ebx, 0)
++	leal	oSIGMASK(%eax), %edx
++	xorl	%ecx, %ecx
++	movl	$SIG_BLOCK, %ebx
++	movl	$__NR_sigprocmask, %eax
++	ENTER_KERNEL
++	popl	%ebx
++	cfi_adjust_cfa_offset (-4)
++	cfi_restore (ebx)
++	cmpl	$-4095, %eax		/* Check %eax for error.  */
++	jae	SYSCALL_ERROR_LABEL	/* Jump to error handler if error.  */
++
++	/* All done, return 0 for success.  */
++	xorl	%eax, %eax
++L(pseudo_end):
++	ret
++PSEUDO_END(__getcontext)
++
++weak_alias (__getcontext, getcontext)
+diff --git a/libc/sysdeps/linux/i386/makecontext.S b/libc/sysdeps/linux/i386/makecontext.S
+new file mode 100644
+index 0000000..d12799d
+--- /dev/null
++++ b/libc/sysdeps/linux/i386/makecontext.S
+@@ -0,0 +1,123 @@
++/* Create new context.
++   Copyright (C) 2001,2002,2005,2007,2008,2009 Free Software Foundation, Inc.
++   This file is part of the GNU C Library.
++   Contributed by Ulrich Drepper <drepper@redhat.com>, 2001.
++
++   The GNU C Library is free software; you can redistribute it and/or
++   modify it under the terms of the GNU Lesser General Public
++   License as published by the Free Software Foundation; either
++   version 2.1 of the License, or (at your option) any later version.
++
++   The GNU C Library is distributed in the hope that it will be useful,
++   but WITHOUT ANY WARRANTY; without even the implied warranty of
++   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
++   Lesser General Public License for more details.
++
++   You should have received a copy of the GNU Lesser General Public
++   License along with the GNU C Library; if not, see
++   <http://www.gnu.org/licenses/>.  */
++
++#include <sysdep.h>
++
++#include "ucontext_i.h"
++
++
++ENTRY(__makecontext)
++	movl	4(%esp), %eax
++
++	/* Load the address of the function we are supposed to run.  */
++	movl	8(%esp), %ecx
++
++	/* Compute the address of the stack.  The information comes from
++	   to us_stack element.  */
++	movl	oSS_SP(%eax), %edx
++	movl	%ecx, oEIP(%eax)
++	addl	oSS_SIZE(%eax), %edx
++
++	/* Remember the number of parameters for the exit handler since
++	   it has to remove them.  We store the number in the EBX register
++	   which the function we will call must preserve.  */
++	movl	12(%esp), %ecx
++	movl	%ecx, oEBX(%eax)
++
++	/* Make room on the new stack for the parameters.
++	   Room for the arguments, return address (== L(exitcode)) and
++	   oLINK pointer is needed.  One of the pointer sizes is subtracted
++	   after aligning the stack.  */
++	negl	%ecx
++	leal	-4(%edx,%ecx,4), %edx
++	negl	%ecx
++
++	/* Align the stack.  */
++	andl	$0xfffffff0, %edx
++	subl	$4, %edx
++
++	/* Store the future stack pointer.  */
++	movl	%edx, oESP(%eax)
++
++	/* Put the next context on the new stack (from the uc_link
++	   element).  */
++	movl	oLINK(%eax), %eax
++	movl	%eax, 4(%edx,%ecx,4)
++
++	/* Copy all the parameters.  */
++	jecxz	2f
++1:	movl	12(%esp,%ecx,4), %eax
++	movl	%eax, (%edx,%ecx,4)
++	decl	%ecx
++	jnz	1b
++2:
++
++	/* If the function we call returns we must continue with the
++	   context which is given in the uc_link element.  To do this
++	   set the return address for the function the user provides
++	   to a little bit of helper code which does the magic (see
++	   below).  */
++#ifdef __PIC__
++	call	1f
++	cfi_adjust_cfa_offset (4)
++1:	popl	%ecx
++	cfi_adjust_cfa_offset (-4)
++	addl	$L(exitcode)-1b, %ecx
++	movl	%ecx, (%edx)
++#else
++	movl	$L(exitcode), (%edx)
++#endif
++	/* 'makecontext' returns no value.  */
++L(pseudo_end):
++	ret
++
++	/* This is the helper code which gets called if a function which
++	   is registered with 'makecontext' returns.  In this case we
++	   have to install the context listed in the uc_link element of
++	   the context 'makecontext' manipulated at the time of the
++	   'makecontext' call.  If the pointer is NULL the process must
++	   terminate.  */
++	cfi_endproc
++L(exitcode):
++	/* This removes the parameters passed to the function given to
++	   'makecontext' from the stack.  EBX contains the number of
++	   parameters (see above).  */
++	leal	(%esp,%ebx,4), %esp
++
++#ifdef	__PIC__
++	call	1f
++1:	popl	%ebx
++	addl	$_GLOBAL_OFFSET_TABLE_+[.-1b], %ebx
++#endif
++	cmpl	$0, (%esp)		/* Check the next context.  */
++	je	2f			/* If it is zero exit.  */
++
++	call	JUMPTARGET(__setcontext)
++	/* If this returns (which can happen if the syscall fails) we'll
++	   exit the program with the return error value (-1).  */
++
++	movl	%eax, (%esp)
++2:	call	HIDDEN_JUMPTARGET(exit)
++	/* The 'exit' call should never return.  In case it does cause
++	   the process to terminate.  */
++	hlt
++	cfi_startproc
++END(__makecontext)
++
++weak_alias (__makecontext, makecontext)
+diff --git a/libc/sysdeps/linux/i386/setcontext.S b/libc/sysdeps/linux/i386/setcontext.S
+new file mode 100644
+index 0000000..ae953cc
+--- /dev/null
++++ b/libc/sysdeps/linux/i386/setcontext.S
+@@ -0,0 +1,96 @@
++/* Install given context.
++   Copyright (C) 2001-2012 Free Software Foundation, Inc.
++   This file is part of the GNU C Library.
++   Contributed by Ulrich Drepper <drepper@redhat.com>, 2001.
++
++   The GNU C Library is free software; you can redistribute it and/or
++   modify it under the terms of the GNU Lesser General Public
++   License as published by the Free Software Foundation; either
++   version 2.1 of the License, or (at your option) any later version.
++
++   The GNU C Library is distributed in the hope that it will be useful,
++   but WITHOUT ANY WARRANTY; without even the implied warranty of
++   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
++   Lesser General Public License for more details.
++
++   You should have received a copy of the GNU Lesser General Public
++   License along with the GNU C Library; if not, see
++   <http://www.gnu.org/licenses/>.  */
++
++#include <sysdep.h>
++
++#include "ucontext_i.h"
++
++
++ENTRY(__setcontext)
++	/* Load address of the context data structure.  */
++	movl	4(%esp), %eax
++
++	/* Get the current signal mask.  Note that we preserve EBX in case
++	   the system call fails and we return from the function with an
++	   error.  */
++	pushl	%ebx
++	cfi_adjust_cfa_offset (4)
++	xorl	%edx, %edx
++	leal	oSIGMASK(%eax), %ecx
++	movl	$SIG_SETMASK, %ebx
++	cfi_rel_offset (ebx, 0)
++	movl	$__NR_sigprocmask, %eax
++	ENTER_KERNEL
++	popl	%ebx
++	cfi_adjust_cfa_offset (-4)
++	cfi_restore (ebx)
++	cmpl	$-4095, %eax		/* Check %eax for error.  */
++	jae	SYSCALL_ERROR_LABEL	/* Jump to error handler if error.  */
++
++	/* EAX was modified, reload it.  */
++	movl	4(%esp), %eax
++
++	/* Restore the floating-point context.  Not the registers, only the
++	   rest.  */
++	movl	oFPREGS(%eax), %ecx
++	fldenv	(%ecx)
++
++	/* Restore the FS segment register.  We don't touch the GS register
++	   since it is used for threads.  */
++	movl	oFS(%eax), %ecx
++	movw	%cx, %fs
++
++	/* Fetch the address to return to.  */
++	movl	oEIP(%eax), %ecx
++
++	/* Load the new stack pointer.  */
++	cfi_def_cfa (eax, 0)
++	cfi_offset (edi, oEDI)
++	cfi_offset (esi, oESI)
++	cfi_offset (ebp, oEBP)
++	cfi_offset (ebx, oEBX)
++	cfi_offset (edx, oEDX)
++	cfi_offset (ecx, oECX)
++	movl	oESP(%eax), %esp
++
++	/* Push the return address on the new stack so we can return there.  */
++	pushl	%ecx
++
++	/* Load the values of all the 32-bit registers (except ESP).
++	   Since we are loading from EAX, it must be last.  */
++	movl	oEDI(%eax), %edi
++	movl	oESI(%eax), %esi
++	movl	oEBP(%eax), %ebp
++	movl	oEBX(%eax), %ebx
++	movl	oEDX(%eax), %edx
++	movl	oECX(%eax), %ecx
++	movl	oEAX(%eax), %eax
++
++	/* End FDE here, we fall into another context.  */
++	cfi_endproc
++	cfi_startproc
++
++	/* The following 'ret' will pop the address of the code and jump
++	   to it.  */
++
++L(pseudo_end):
++	ret
++PSEUDO_END(__setcontext)
++
++weak_alias (__setcontext, setcontext)
+diff --git a/libc/sysdeps/linux/i386/swapcontext.S b/libc/sysdeps/linux/i386/swapcontext.S
+new file mode 100644
+index 0000000..ee5d0e4
+--- /dev/null
++++ b/libc/sysdeps/linux/i386/swapcontext.S
+@@ -0,0 +1,110 @@
++/* Save current context and install the given one.
++   Copyright (C) 2001-2012 Free Software Foundation, Inc.
++   This file is part of the GNU C Library.
++   Contributed by Ulrich Drepper <drepper@redhat.com>, 2001.
++
++   The GNU C Library is free software; you can redistribute it and/or
++   modify it under the terms of the GNU Lesser General Public
++   License as published by the Free Software Foundation; either
++   version 2.1 of the License, or (at your option) any later version.
++
++   The GNU C Library is distributed in the hope that it will be useful,
++   but WITHOUT ANY WARRANTY; without even the implied warranty of
++   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
++   Lesser General Public License for more details.
++
++   You should have received a copy of the GNU Lesser General Public
++   License along with the GNU C Library; if not, see
++   <http://www.gnu.org/licenses/>.  */
++
++#include <sysdep.h>
++
++#include "ucontext_i.h"
++
++
++ENTRY(__swapcontext)
++	/* Load address of the context data structure we save in.  */
++	movl	4(%esp), %eax
++
++	/* Return value of swapcontext.  EAX is the only register whose
++	   value is not preserved.  */
++	movl	$0, oEAX(%eax)
++
++	/* Save the 32-bit register values and the return address.  */
++	movl	%ecx, oECX(%eax)
++	movl	%edx, oEDX(%eax)
++	movl	%edi, oEDI(%eax)
++	movl	%esi, oESI(%eax)
++	movl	%ebp, oEBP(%eax)
++	movl	(%esp), %ecx
++	movl	%ecx, oEIP(%eax)
++	leal	4(%esp), %ecx
++	movl	%ecx, oESP(%eax)
++	movl	%ebx, oEBX(%eax)
++
++	/* Save the FS segment register.  */
++	xorl	%edx, %edx
++	movw	%fs, %dx
++	movl	%edx, oFS(%eax)
++
++	/* We have separate floating-point register content memory on the
++	   stack.  We use the __fpregs_mem block in the context.  Set the
++	   links up correctly.  */
++	leal	oFPREGSMEM(%eax), %ecx
++	movl	%ecx, oFPREGS(%eax)
++	/* Save the floating-point context.  */
++	fnstenv	(%ecx)
++
++	/* Load address of the context data structure we have to load.  */
++	movl	8(%esp), %ecx
++
++	/* Save the current signal mask and install the new one.  */
++	pushl	%ebx
++	leal	oSIGMASK(%eax), %edx
++	leal	oSIGMASK(%ecx), %ecx
++	movl	$SIG_SETMASK, %ebx
++	movl	$__NR_sigprocmask, %eax
++	ENTER_KERNEL
++	popl	%ebx
++	cmpl	$-4095, %eax		/* Check %eax for error.  */
++	jae	SYSCALL_ERROR_LABEL	/* Jump to error handler if error.  */
++
++	/* EAX was modified, reload it.  */
++	movl	8(%esp), %eax
++
++	/* Restore the floating-point context.  Not the registers, only the
++	   rest.  */
++	movl	oFPREGS(%eax), %ecx
++	fldenv	(%ecx)
++
++	/* Restore the FS segment register.  We don't touch the GS register
++	   since it is used for threads.  */
++	movl	oFS(%eax), %edx
++	movw	%dx, %fs
++
++	/* Fetch the address to return to.  */
++	movl	oEIP(%eax), %ecx
++
++	/* Load the new stack pointer.  */
++	movl	oESP(%eax), %esp
++
++	/* Push the return address on the new stack so we can return there.  */
++	pushl	%ecx
++
++	/* Load the values of all the 32-bit registers (except ESP).
++	   Since we are loading from EAX, it must be last.  */
++	movl	oEDI(%eax), %edi
++	movl	oESI(%eax), %esi
++	movl	oEBP(%eax), %ebp
++	movl	oEBX(%eax), %ebx
++	movl	oEDX(%eax), %edx
++	movl	oECX(%eax), %ecx
++	movl	oEAX(%eax), %eax
++
++	/* The following 'ret' will pop the address of the code and jump
++	   to it.  */
++L(pseudo_end):
++	ret
++PSEUDO_END(__swapcontext)
++
++weak_alias (__swapcontext, swapcontext)
+diff --git a/libc/sysdeps/linux/i386/ucontext_i.sym b/libc/sysdeps/linux/i386/ucontext_i.sym
+new file mode 100644
+index 0000000..b11a550
+--- /dev/null
++++ b/libc/sysdeps/linux/i386/ucontext_i.sym
+@@ -0,0 +1,30 @@
++#include <stddef.h>
++#include <signal.h>
++#include <sys/ucontext.h>
++
++--
++
++SIG_BLOCK
++SIG_SETMASK
++
++#define ucontext(member)	offsetof (ucontext_t, member)
++#define mcontext(member)	ucontext (uc_mcontext.member)
++#define mreg(reg)		mcontext (gregs[REG_##reg])
++
++oLINK		ucontext (uc_link)
++oSS_SP		ucontext (uc_stack.ss_sp)
++oSS_SIZE	ucontext (uc_stack.ss_size)
++oGS		mreg (GS)
++oFS		mreg (FS)
++oEDI		mreg (EDI)
++oESI		mreg (ESI)
++oEBP		mreg (EBP)
++oESP		mreg (ESP)
++oEBX		mreg (EBX)
++oEDX		mreg (EDX)
++oECX		mreg (ECX)
++oEAX		mreg (EAX)
++oEIP		mreg (EIP)
++oFPREGS		mcontext (fpregs)
++oSIGMASK	ucontext (uc_sigmask)
++oFPREGSMEM	ucontext (__fpregs_mem)
+diff --git a/libc/sysdeps/linux/mips/Makefile.arch b/libc/sysdeps/linux/mips/Makefile.arch
+index fce99f8..00b9331 100644
+--- a/libc/sysdeps/linux/mips/Makefile.arch
++++ b/libc/sysdeps/linux/mips/Makefile.arch
+@@ -27,3 +27,7 @@ ASFLAGS-syscall_error.S += -D_LIBC_REENTRANT
+ 
+ ARCH_HEADERS := sgidefs.h
+ # regdef.h
++
++ifeq ($(UCLIBC_HAS_CONTEXT_FUNCS),y)
++SSRC += makecontext.S setcontext.S getcontext.S swapcontext.S
++endif
+diff --git a/libc/sysdeps/linux/mips/getcontext.S b/libc/sysdeps/linux/mips/getcontext.S
+new file mode 100644
+index 0000000..c4ad081
+--- /dev/null
++++ b/libc/sysdeps/linux/mips/getcontext.S
+@@ -0,0 +1,148 @@
++/* Save current context.
++   Copyright (C) 2009 Free Software Foundation, Inc.
++   This file is part of the GNU C Library.
++   Contributed by Maciej W. Rozycki <macro@codesourcery.com>.
++
++   The GNU C Library is free software; you can redistribute it and/or
++   modify it under the terms of the GNU Lesser General Public
++   License as published by the Free Software Foundation; either
++   version 2.1 of the License, or (at your option) any later version.
++
++   The GNU C Library is distributed in the hope that it will be useful,
++   but WITHOUT ANY WARRANTY; without even the implied warranty of
++   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
++   Lesser General Public License for more details.
++
++   You should have received a copy of the GNU Lesser General Public
++   License along with the GNU C Library.  If not, see
++   <http://www.gnu.org/licenses/>.  */
++
++#include <sysdep.h>
++#include <sys/asm.h>
++#include <sys/fpregdef.h>
++#include <sys/regdef.h>
++
++#include "ucontext_i.h"
++
++/* int getcontext (ucontext_t *ucp) */
++
++	.text
++LOCALSZ = 0
++MASK = 0x00000000
++#ifdef __PIC__
++LOCALSZ = 1						/* save gp */
++# if _MIPS_SIM != _ABIO32
++MASK = 0x10000000
++# endif
++#endif
++FRAMESZ = ((LOCALSZ * SZREG) + ALSZ) & ALMASK
++GPOFF = FRAMESZ - (1 * SZREG)
++
++NESTED (__getcontext, FRAMESZ, ra)
++	.mask	MASK, 0
++	.fmask	0x00000000, 0
++
++#ifdef __PIC__
++	SETUP_GP
++
++	move	a2, sp
++# define _SP a2
++
++# if _MIPS_SIM != _ABIO32
++	move	a3, gp
++#  define _GP a3
++# endif
++
++	PTR_ADDIU sp, -FRAMESZ
++	SETUP_GP64 (GPOFF, __getcontext)
++	SAVE_GP (GPOFF)
++
++#else  /* ! __PIC__ */
++# define _SP sp
++# define _GP gp
++
++#endif /* ! __PIC__ */
++
++#ifdef PROF
++	.set	noat
++	move	AT, ra
++	jal	_mcount
++	.set	at
++#endif
++
++	/* Store a magic flag.	*/
++	li	v1, 1
++	REG_S	v1, (0 * SZREG + MCONTEXT_GREGS)(a0)	/* zero */
++
++	REG_S	s0, (16 * SZREG + MCONTEXT_GREGS)(a0)
++	REG_S	s1, (17 * SZREG + MCONTEXT_GREGS)(a0)
++	REG_S	s2, (18 * SZREG + MCONTEXT_GREGS)(a0)
++	REG_S	s3, (19 * SZREG + MCONTEXT_GREGS)(a0)
++	REG_S	s4, (20 * SZREG + MCONTEXT_GREGS)(a0)
++	REG_S	s5, (21 * SZREG + MCONTEXT_GREGS)(a0)
++	REG_S	s6, (22 * SZREG + MCONTEXT_GREGS)(a0)
++	REG_S	s7, (23 * SZREG + MCONTEXT_GREGS)(a0)
++#if ! defined (__PIC__) || _MIPS_SIM != _ABIO32
++	REG_S	_GP, (28 * SZREG + MCONTEXT_GREGS)(a0)
++#endif
++	REG_S	_SP, (29 * SZREG + MCONTEXT_GREGS)(a0)
++	REG_S	fp, (30 * SZREG + MCONTEXT_GREGS)(a0)
++	REG_S	ra, (31 * SZREG + MCONTEXT_GREGS)(a0)
++	REG_S	ra, MCONTEXT_PC(a0)
++
++#ifdef __mips_hard_float
++# if _MIPS_SIM == _ABI64
++	s.d	fs0, (24 * SZREG + MCONTEXT_FPREGS)(a0)
++	s.d	fs1, (25 * SZREG + MCONTEXT_FPREGS)(a0)
++	s.d	fs2, (26 * SZREG + MCONTEXT_FPREGS)(a0)
++	s.d	fs3, (27 * SZREG + MCONTEXT_FPREGS)(a0)
++	s.d	fs4, (28 * SZREG + MCONTEXT_FPREGS)(a0)
++	s.d	fs5, (29 * SZREG + MCONTEXT_FPREGS)(a0)
++	s.d	fs6, (30 * SZREG + MCONTEXT_FPREGS)(a0)
++	s.d	fs7, (31 * SZREG + MCONTEXT_FPREGS)(a0)
++
++# else  /* _MIPS_SIM != _ABI64 */
++	s.d	fs0, (20 * SZREG + MCONTEXT_FPREGS)(a0)
++	s.d	fs1, (22 * SZREG + MCONTEXT_FPREGS)(a0)
++	s.d	fs2, (24 * SZREG + MCONTEXT_FPREGS)(a0)
++	s.d	fs3, (26 * SZREG + MCONTEXT_FPREGS)(a0)
++	s.d	fs4, (28 * SZREG + MCONTEXT_FPREGS)(a0)
++	s.d	fs5, (30 * SZREG + MCONTEXT_FPREGS)(a0)
++
++# endif /* _MIPS_SIM != _ABI64 */
++
++	cfc1	v1, fcr31
++	sw	v1, MCONTEXT_FPC_CSR(a0)
++#endif /* __mips_hard_float */
++
++/* rt_sigprocmask (SIG_BLOCK, NULL, &ucp->uc_sigmask, _NSIG8) */
++	li	a3, _NSIG8
++	PTR_ADDU a2, a0, UCONTEXT_SIGMASK
++	move	a1, zero
++	li	a0, SIG_BLOCK
++
++	li	v0, SYS_ify (rt_sigprocmask)
++	syscall
++	bnez	a3, 99f
++
++#ifdef __PIC__
++	RESTORE_GP64
++	PTR_ADDIU sp, FRAMESZ
++#endif
++	move	v0, zero
++	jr	ra
++
++99:
++#ifdef __PIC__
++	PTR_LA	t9, JUMPTARGET (__syscall_error)
++	RESTORE_GP64
++	PTR_ADDIU sp, FRAMESZ
++	jr	t9
++
++#else  /* ! __PIC__ */
++
++	j	JUMPTARGET (__syscall_error)
++#endif /* ! __PIC__ */
++PSEUDO_END (__getcontext)
++
++weak_alias (__getcontext, getcontext)
+diff --git a/libc/sysdeps/linux/mips/kernel_rt_sigframe.h b/libc/sysdeps/linux/mips/kernel_rt_sigframe.h
+new file mode 100644
+index 0000000..77ffaf6
+--- /dev/null
++++ b/libc/sysdeps/linux/mips/kernel_rt_sigframe.h
+@@ -0,0 +1,10 @@
++/* Linux kernel RT signal frame. */
++typedef struct kernel_rt_sigframe
++  {
++    uint32_t rs_ass[4];
++    uint32_t rs_code[2];
++    siginfo_t rs_info;
++    struct ucontext rs_uc;
++    uint32_t rs_altcode[8] __attribute__ ((__aligned__ (1 << 7)));
++  }
++kernel_rt_sigframe_t;
+diff --git a/libc/sysdeps/linux/mips/makecontext.S b/libc/sysdeps/linux/mips/makecontext.S
+new file mode 100644
+index 0000000..6427339
+--- /dev/null
++++ b/libc/sysdeps/linux/mips/makecontext.S
+@@ -0,0 +1,188 @@
++/* Modify saved context.
++   Copyright (C) 2009 Free Software Foundation, Inc.
++   This file is part of the GNU C Library.
++   Contributed by Maciej W. Rozycki <macro@codesourcery.com>.
++
++   The GNU C Library is free software; you can redistribute it and/or
++   modify it under the terms of the GNU Lesser General Public
++   License as published by the Free Software Foundation; either
++   version 2.1 of the License, or (at your option) any later version.
++
++   The GNU C Library is distributed in the hope that it will be useful,
++   but WITHOUT ANY WARRANTY; without even the implied warranty of
++   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
++   Lesser General Public License for more details.
++
++   You should have received a copy of the GNU Lesser General Public
++   License along with the GNU C Library.  If not, see
++   <http://www.gnu.org/licenses/>.  */
++
++#include <sysdep.h>
++#include <sys/asm.h>
++#include <sys/fpregdef.h>
++#include <sys/regdef.h>
++
++#include "ucontext_i.h"
++
++/* int makecontext (ucontext_t *ucp, (void *func) (), int argc, ...) */
++
++	.text
++LOCALSZ = 0
++ARGSZ = 0
++MASK = 0x00000000
++#ifdef __PIC__
++LOCALSZ = 1						/* save gp */
++#endif
++#if _MIPS_SIM != _ABIO32
++ARGSZ = 5						/* save a3-a7 */
++# ifdef __PIC__
++MASK = 0x10000000
++# endif
++#endif
++FRAMESZ = (((ARGSZ + LOCALSZ) * SZREG) + ALSZ) & ALMASK
++GPOFF = FRAMESZ - ((ARGSZ + 1) * SZREG)
++#if _MIPS_SIM != _ABIO32
++A3OFF = FRAMESZ - (5 * SZREG)				/* callee-allocated */
++A4OFF = FRAMESZ - (4 * SZREG)
++A5OFF = FRAMESZ - (3 * SZREG)
++A6OFF = FRAMESZ - (2 * SZREG)
++A7OFF = FRAMESZ - (1 * SZREG)
++NARGREGS = 8
++#else
++A3OFF = FRAMESZ + (3 * SZREG)				/* caller-allocated */
++NARGREGS = 4
++#endif
++
++NESTED (__makecontext, FRAMESZ, ra)
++	.mask	MASK, -(ARGSZ * SZREG)
++	.fmask	0x00000000, 0
++
++98:
++#ifdef __PIC__
++	SETUP_GP
++#endif
++
++	PTR_ADDIU sp, -FRAMESZ
++
++#ifdef __PIC__
++	SETUP_GP64 (GPOFF, __makecontext)
++	SAVE_GP (GPOFF)
++#endif
++
++#ifdef PROF
++	.set	noat
++	move	AT, ra
++	jal	_mcount
++	.set	at
++#endif
++
++	/* Store args to be passed.  */
++	REG_S	a3, A3OFF(sp)
++#if _MIPS_SIM != _ABIO32
++	REG_S	a4, A4OFF(sp)
++	REG_S	a5, A5OFF(sp)
++	REG_S	a6, A6OFF(sp)
++	REG_S	a7, A7OFF(sp)
++#endif
++
++	/* Store a magic flag.  */
++	li	v1, 1
++	REG_S	v1, (0 * SZREG + MCONTEXT_GREGS)(a0)	/* zero */
++
++	/* Set up the stack.  */
++	PTR_L	t0, STACK_SP(a0)
++	PTR_L	t2, STACK_SIZE(a0)
++	PTR_ADDIU t1, sp, A3OFF
++	PTR_ADDU t0, t2
++	and	t0, ALMASK
++	blez	a2, 2f					/* no arguments */
++
++	/* Store register arguments.  */
++	PTR_ADDIU t2, a0, MCONTEXT_GREGS + 4 * SZREG
++	move	t3, zero
++0:
++	addiu	t3, 1
++	REG_L	v1, (t1)
++	PTR_ADDIU t1, SZREG
++	REG_S	v1, (t2)
++	PTR_ADDIU t2, SZREG
++	bgeu	t3, a2, 2f				/* all done */
++	bltu	t3, NARGREGS, 0b			/* next */
++
++	/* Make room for stack arguments.  */
++	PTR_SUBU t2, a2, t3
++	PTR_SLL	t2, 3
++	PTR_SUBU t0, t2
++	and	t0, ALMASK
++
++	/* Store stack arguments.  */
++	move	t2, t0
++1:
++	addiu	t3, 1
++	REG_L	v1, (t1)
++	PTR_ADDIU t1, SZREG
++	REG_S	v1, (t2)
++	PTR_ADDIU t2, SZREG
++	bltu	t3, a2, 1b				/* next */
++
++2:
++#if _MIPS_SIM == _ABIO32
++	/* Make room for a0-a3 storage.  */
++	PTR_ADDIU t0, -(NARGSAVE * SZREG)
++#endif
++	PTR_L	v1, UCONTEXT_LINK(a0)
++#ifdef __PIC__
++	PTR_ADDIU t9, 99f - 98b
++#else
++	PTR_LA	t9, 99f
++#endif
++	REG_S	t0, (29 * SZREG + MCONTEXT_GREGS)(a0)	/* sp */
++	REG_S	v1, (16 * SZREG + MCONTEXT_GREGS)(a0)	/* s0 */
++#ifdef __PIC__
++	REG_S	gp, (17 * SZREG + MCONTEXT_GREGS)(a0)	/* s1 */
++#endif
++	REG_S	t9, (31 * SZREG + MCONTEXT_GREGS)(a0)	/* ra */
++	REG_S	a1, MCONTEXT_PC(a0)
++
++#ifdef __PIC__
++	RESTORE_GP64
++	PTR_ADDIU sp, FRAMESZ
++#endif
++	jr	ra
++
++99:
++#ifdef __PIC__
++	move	gp, s1
++#endif
++	move	a0, zero
++	beqz	s0, 0f
++
++	/* setcontext (ucp) */
++	move	a0, s0
++#ifdef __PIC__
++	PTR_LA	t9, JUMPTARGET (__setcontext)
++	jalr	t9
++# if _MIPS_SIM == _ABIO32
++	move	gp, s1
++# endif
++#else
++	jal	JUMPTARGET (__setcontext)
++#endif
++	move	a0, v0
++
++0:
++	/* exit (a0) */
++#ifdef __PIC__
++	PTR_LA	t9, HIDDEN_JUMPTARGET (exit)
++	jalr	t9
++#else
++	jal	HIDDEN_JUMPTARGET (exit)
++#endif
++
++	/* You don't exist, you won't feel anything.  */
++1:
++	lb	zero, (zero)
++	b	1b
++PSEUDO_END (__makecontext)
++
++weak_alias (__makecontext, makecontext)
+diff --git a/libc/sysdeps/linux/mips/setcontext.S b/libc/sysdeps/linux/mips/setcontext.S
+new file mode 100644
+index 0000000..d3cde0e
+--- /dev/null
++++ b/libc/sysdeps/linux/mips/setcontext.S
+@@ -0,0 +1,191 @@
++/* Set current context.
++   Copyright (C) 2009 Free Software Foundation, Inc.
++   This file is part of the GNU C Library.
++   Contributed by Maciej W. Rozycki <macro@codesourcery.com>.
++
++   The GNU C Library is free software; you can redistribute it and/or
++   modify it under the terms of the GNU Lesser General Public
++   License as published by the Free Software Foundation; either
++   version 2.1 of the License, or (at your option) any later version.
++
++   The GNU C Library is distributed in the hope that it will be useful,
++   but WITHOUT ANY WARRANTY; without even the implied warranty of
++   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
++   Lesser General Public License for more details.
++
++   You should have received a copy of the GNU Lesser General Public
++   License along with the GNU C Library.  If not, see
++   <http://www.gnu.org/licenses/>.  */
++
++#include <sysdep.h>
++#include <sys/asm.h>
++#include <sys/fpregdef.h>
++#include <sys/regdef.h>
++
++#include "ucontext_i.h"
++
++/* int setcontext (const ucontext_t *ucp) */
++
++	.text
++LOCALSZ = 0
++ARGSZ = 0
++MASK = 0x00000000
++#ifdef __PIC__
++LOCALSZ = 1						/* save gp */
++#endif
++#if _MIPS_SIM != _ABIO32
++ARGSZ = 1						/* save a0 */
++# ifdef __PIC__
++MASK = 0x10000000
++# endif
++#endif
++FRAMESZ = (((ARGSZ + LOCALSZ) * SZREG) + ALSZ) & ALMASK
++GPOFF = FRAMESZ - ((ARGSZ + 1) * SZREG)
++#if _MIPS_SIM != _ABIO32
++A0OFF = FRAMESZ - (1 * SZREG)				/* callee-allocated */
++#else
++A0OFF = FRAMESZ + (0 * SZREG)				/* caller-allocated */
++#endif
++
++NESTED (__setcontext, FRAMESZ, ra)
++	.mask	MASK, -(ARGSZ * SZREG)
++	.fmask	0x00000000, 0
++
++#ifdef __PIC__
++	SETUP_GP
++#endif
++
++	PTR_ADDIU sp, -FRAMESZ
++
++#ifdef __PIC__
++	SETUP_GP64 (GPOFF, __setcontext)
++	SAVE_GP (GPOFF)
++#endif
++
++#ifdef PROF
++	.set	noat
++	move	AT, ra
++	jal	_mcount
++	.set	at
++#endif
++
++	/* Check for the magic flag.  */
++	li	v0, 1
++	REG_L	v1, (0 * SZREG + MCONTEXT_GREGS)(a0)	/* zero */
++	bne	v0, v1, 98f
++
++	REG_S	a0, A0OFF(sp)
++
++/* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, NULL, _NSIG8) */
++	li	a3, _NSIG8
++	move	a2, zero
++	PTR_ADDU a1, a0, UCONTEXT_SIGMASK
++	li	a0, SIG_SETMASK
++
++	li	v0, SYS_ify (rt_sigprocmask)
++	syscall
++	bnez	a3, 99f
++
++	REG_L	v0, A0OFF(sp)
++
++#ifdef __mips_hard_float
++# if _MIPS_SIM == _ABI64
++	l.d	fs0, (24 * SZREG + MCONTEXT_FPREGS)(v0)
++	l.d	fs1, (25 * SZREG + MCONTEXT_FPREGS)(v0)
++	l.d	fs2, (26 * SZREG + MCONTEXT_FPREGS)(v0)
++	l.d	fs3, (27 * SZREG + MCONTEXT_FPREGS)(v0)
++	l.d	fs4, (28 * SZREG + MCONTEXT_FPREGS)(v0)
++	l.d	fs5, (29 * SZREG + MCONTEXT_FPREGS)(v0)
++	l.d	fs6, (30 * SZREG + MCONTEXT_FPREGS)(v0)
++	l.d	fs7, (31 * SZREG + MCONTEXT_FPREGS)(v0)
++
++# else  /* _MIPS_SIM != _ABI64 */
++	l.d	fs0, (20 * SZREG + MCONTEXT_FPREGS)(v0)
++	l.d	fs1, (22 * SZREG + MCONTEXT_FPREGS)(v0)
++	l.d	fs2, (24 * SZREG + MCONTEXT_FPREGS)(v0)
++	l.d	fs3, (26 * SZREG + MCONTEXT_FPREGS)(v0)
++	l.d	fs4, (28 * SZREG + MCONTEXT_FPREGS)(v0)
++	l.d	fs5, (30 * SZREG + MCONTEXT_FPREGS)(v0)
++
++# endif /* _MIPS_SIM != _ABI64 */
++
++	lw	v1, MCONTEXT_FPC_CSR(v0)
++	ctc1	v1, fcr31
++#endif /* __mips_hard_float */
++
++	/* Note the contents of argument registers will be random
++	   unless makecontext() has been called.  */
++	REG_L	a0, (4 * SZREG + MCONTEXT_GREGS)(v0)
++	REG_L	a1, (5 * SZREG + MCONTEXT_GREGS)(v0)
++	REG_L	a2, (6 * SZREG + MCONTEXT_GREGS)(v0)
++	REG_L	a3, (7 * SZREG + MCONTEXT_GREGS)(v0)
++#if _MIPS_SIM != _ABIO32
++	REG_L	a4, (8 * SZREG + MCONTEXT_GREGS)(v0)
++	REG_L	a5, (9 * SZREG + MCONTEXT_GREGS)(v0)
++	REG_L	a6, (10 * SZREG + MCONTEXT_GREGS)(v0)
++	REG_L	a7, (11 * SZREG + MCONTEXT_GREGS)(v0)
++#endif
++
++	REG_L	s0, (16 * SZREG + MCONTEXT_GREGS)(v0)
++	REG_L	s1, (17 * SZREG + MCONTEXT_GREGS)(v0)
++	REG_L	s2, (18 * SZREG + MCONTEXT_GREGS)(v0)
++	REG_L	s3, (19 * SZREG + MCONTEXT_GREGS)(v0)
++	REG_L	s4, (20 * SZREG + MCONTEXT_GREGS)(v0)
++	REG_L	s5, (21 * SZREG + MCONTEXT_GREGS)(v0)
++	REG_L	s6, (22 * SZREG + MCONTEXT_GREGS)(v0)
++	REG_L	s7, (23 * SZREG + MCONTEXT_GREGS)(v0)
++#if ! defined (__PIC__) || _MIPS_SIM != _ABIO32
++	REG_L	gp, (28 * SZREG + MCONTEXT_GREGS)(v0)
++#endif
++	REG_L	sp, (29 * SZREG + MCONTEXT_GREGS)(v0)
++	REG_L	fp, (30 * SZREG + MCONTEXT_GREGS)(v0)
++	REG_L	ra, (31 * SZREG + MCONTEXT_GREGS)(v0)
++	REG_L	t9, MCONTEXT_PC(v0)
++
++	move	v0, zero
++	jr	t9
++
++98:
++	/* This is a context obtained from a signal handler.
++	   Perform a full restore by pushing the context
++	   passed onto a simulated signal frame on the stack
++	   and call the signal return syscall as if a signal
++	   handler exited normally.  */
++	PTR_ADDIU sp, -((RT_SIGFRAME_SIZE + ALSZ) & ALMASK)
++
++	/* Only ucontext is referred to from rt_sigreturn,
++	   copy it.  */
++	PTR_ADDIU t1, sp, RT_SIGFRAME_UCONTEXT
++	li	t3, ((UCONTEXT_SIZE + SZREG - 1) / SZREG) - 1
++0:
++	REG_L	t2, (a0)
++	PTR_ADDIU a0, SZREG
++	REG_S	t2, (t1)
++	PTR_ADDIU t1, SZREG
++	.set	noreorder
++	bgtz	t3, 0b
++	 addiu	t3, -1
++	.set	reorder
++
++/* rt_sigreturn () -- no arguments, sp points to struct rt_sigframe.  */
++	li	v0, SYS_ify (rt_sigreturn)
++	syscall
++
++	/* Restore the stack and fall through to the error
++	   path.  Successful rt_sigreturn never returns to
++	   its calling place.  */
++	PTR_ADDIU sp, ((RT_SIGFRAME_SIZE + ALSZ) & ALMASK)
++99:
++#ifdef __PIC__
++	PTR_LA	t9, JUMPTARGET (__syscall_error)
++	RESTORE_GP64
++	PTR_ADDIU sp, FRAMESZ
++	jr	t9
++
++#else  /* ! __PIC__ */
++
++	j	JUMPTARGET (__syscall_error)
++#endif /* ! __PIC__ */
++PSEUDO_END (__setcontext)
++
++weak_alias (__setcontext, setcontext)
+diff --git a/libc/sysdeps/linux/mips/swapcontext.S b/libc/sysdeps/linux/mips/swapcontext.S
+new file mode 100644
+index 0000000..c7ac19b
+--- /dev/null
++++ b/libc/sysdeps/linux/mips/swapcontext.S
+@@ -0,0 +1,211 @@
++/* Save and set current context.
++   Copyright (C) 2009 Free Software Foundation, Inc.
++   This file is part of the GNU C Library.
++   Contributed by Maciej W. Rozycki <macro@codesourcery.com>.
++
++   The GNU C Library is free software; you can redistribute it and/or
++   modify it under the terms of the GNU Lesser General Public
++   License as published by the Free Software Foundation; either
++   version 2.1 of the License, or (at your option) any later version.
++
++   The GNU C Library is distributed in the hope that it will be useful,
++   but WITHOUT ANY WARRANTY; without even the implied warranty of
++   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
++   Lesser General Public License for more details.
++
++   You should have received a copy of the GNU Lesser General Public
++   License along with the GNU C Library.  If not, see
++   <http://www.gnu.org/licenses/>.  */
++
++#include <sysdep.h>
++#include <sys/asm.h>
++#include <sys/fpregdef.h>
++#include <sys/regdef.h>
++
++#include "ucontext_i.h"
++
++/* int swapcontext (ucontext_t *oucp, const ucontext_t *ucp) */
++
++	.text
++LOCALSZ = 0
++ARGSZ = 0
++MASK = 0x00000000
++#ifdef __PIC__
++LOCALSZ = 1						/* save gp */
++#endif
++#if _MIPS_SIM != _ABIO32
++ARGSZ = 1						/* save a1 */
++# ifdef __PIC__
++MASK = 0x10000000
++# endif
++#endif
++FRAMESZ = (((ARGSZ + LOCALSZ) * SZREG) + ALSZ) & ALMASK
++GPOFF = FRAMESZ - ((ARGSZ + 1) * SZREG)
++#if _MIPS_SIM != _ABIO32
++A1OFF = FRAMESZ - (1 * SZREG)				/* callee-allocated */
++#else
++A1OFF = FRAMESZ + (1 * SZREG)				/* caller-allocated */
++#endif
++
++NESTED (__swapcontext, FRAMESZ, ra)
++	.mask	MASK, -(ARGSZ * SZREG)
++	.fmask	0x00000000, 0
++
++#ifdef __PIC__
++	SETUP_GP
++
++	move	a2, sp
++# define _SP a2
++
++# if _MIPS_SIM != _ABIO32
++	move	a3, gp
++#  define _GP a3
++# endif
++
++	PTR_ADDIU sp, -FRAMESZ
++	SETUP_GP64 (GPOFF, __swapcontext)
++	SAVE_GP (GPOFF)
++
++#else  /* ! __PIC__ */
++# define _SP sp
++# define _GP gp
++
++#endif /* ! __PIC__ */
++
++#ifdef PROF
++	.set	noat
++	move	AT, ra
++	jal	_mcount
++	.set	at
++#endif
++
++	/* Store a magic flag.	*/
++	li	v1, 1
++	REG_S	v1, (0 * SZREG + MCONTEXT_GREGS)(a0)	/* zero */
++
++	REG_S	s0, (16 * SZREG + MCONTEXT_GREGS)(a0)
++	REG_S	s1, (17 * SZREG + MCONTEXT_GREGS)(a0)
++	REG_S	s2, (18 * SZREG + MCONTEXT_GREGS)(a0)
++	REG_S	s3, (19 * SZREG + MCONTEXT_GREGS)(a0)
++	REG_S	s4, (20 * SZREG + MCONTEXT_GREGS)(a0)
++	REG_S	s5, (21 * SZREG + MCONTEXT_GREGS)(a0)
++	REG_S	s6, (22 * SZREG + MCONTEXT_GREGS)(a0)
++	REG_S	s7, (23 * SZREG + MCONTEXT_GREGS)(a0)
++#if ! defined (__PIC__) || _MIPS_SIM != _ABIO32
++	REG_S	_GP, (28 * SZREG + MCONTEXT_GREGS)(a0)
++#endif
++	REG_S	_SP, (29 * SZREG + MCONTEXT_GREGS)(a0)
++	REG_S	fp, (30 * SZREG + MCONTEXT_GREGS)(a0)
++	REG_S	ra, (31 * SZREG + MCONTEXT_GREGS)(a0)
++	REG_S	ra, MCONTEXT_PC(a0)
++
++#ifdef __mips_hard_float
++# if _MIPS_SIM == _ABI64
++	s.d	fs0, (24 * SZREG + MCONTEXT_FPREGS)(a0)
++	s.d	fs1, (25 * SZREG + MCONTEXT_FPREGS)(a0)
++	s.d	fs2, (26 * SZREG + MCONTEXT_FPREGS)(a0)
++	s.d	fs3, (27 * SZREG + MCONTEXT_FPREGS)(a0)
++	s.d	fs4, (28 * SZREG + MCONTEXT_FPREGS)(a0)
++	s.d	fs5, (29 * SZREG + MCONTEXT_FPREGS)(a0)
++	s.d	fs6, (30 * SZREG + MCONTEXT_FPREGS)(a0)
++	s.d	fs7, (31 * SZREG + MCONTEXT_FPREGS)(a0)
++
++# else  /* _MIPS_SIM != _ABI64 */
++	s.d	fs0, (20 * SZREG + MCONTEXT_FPREGS)(a0)
++	s.d	fs1, (22 * SZREG + MCONTEXT_FPREGS)(a0)
++	s.d	fs2, (24 * SZREG + MCONTEXT_FPREGS)(a0)
++	s.d	fs3, (26 * SZREG + MCONTEXT_FPREGS)(a0)
++	s.d	fs4, (28 * SZREG + MCONTEXT_FPREGS)(a0)
++	s.d	fs5, (30 * SZREG + MCONTEXT_FPREGS)(a0)
++
++# endif /* _MIPS_SIM != _ABI64 */
++
++	cfc1	v1, fcr31
++	sw	v1, MCONTEXT_FPC_CSR(a0)
++#endif /* __mips_hard_float */
++
++	REG_S	a1, A1OFF(sp)
++
++/* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, &oucp->uc_sigmask, _NSIG8) */
++	li	a3, _NSIG8
++	PTR_ADDU a2, a0, UCONTEXT_SIGMASK
++	PTR_ADDU a1, a1, UCONTEXT_SIGMASK
++	li	a0, SIG_SETMASK
++
++	li	v0, SYS_ify (rt_sigprocmask)
++	syscall
++	bnez	a3, 99f
++
++	REG_L	v0, A1OFF(sp)
++
++#ifdef __mips_hard_float
++# if _MIPS_SIM == _ABI64
++	l.d	fs0, (24 * SZREG + MCONTEXT_FPREGS)(v0)
++	l.d	fs1, (25 * SZREG + MCONTEXT_FPREGS)(v0)
++	l.d	fs2, (26 * SZREG + MCONTEXT_FPREGS)(v0)
++	l.d	fs3, (27 * SZREG + MCONTEXT_FPREGS)(v0)
++	l.d	fs4, (28 * SZREG + MCONTEXT_FPREGS)(v0)
++	l.d	fs5, (29 * SZREG + MCONTEXT_FPREGS)(v0)
++	l.d	fs6, (30 * SZREG + MCONTEXT_FPREGS)(v0)
++	l.d	fs7, (31 * SZREG + MCONTEXT_FPREGS)(v0)
++
++# else  /* _MIPS_SIM != _ABI64 */
++	l.d	fs0, (20 * SZREG + MCONTEXT_FPREGS)(v0)
++	l.d	fs1, (22 * SZREG + MCONTEXT_FPREGS)(v0)
++	l.d	fs2, (24 * SZREG + MCONTEXT_FPREGS)(v0)
++	l.d	fs3, (26 * SZREG + MCONTEXT_FPREGS)(v0)
++	l.d	fs4, (28 * SZREG + MCONTEXT_FPREGS)(v0)
++	l.d	fs5, (30 * SZREG + MCONTEXT_FPREGS)(v0)
++
++# endif /* _MIPS_SIM != _ABI64 */
++
++	lw	v1, MCONTEXT_FPC_CSR(v0)
++	ctc1	v1, fcr31
++#endif /* __mips_hard_float */
++
++	/* Note the contents of argument registers will be random
++	   unless makecontext() has been called.  */
++	REG_L	a0, (4 * SZREG + MCONTEXT_GREGS)(v0)
++	REG_L	a1, (5 * SZREG + MCONTEXT_GREGS)(v0)
++	REG_L	a2, (6 * SZREG + MCONTEXT_GREGS)(v0)
++	REG_L	a3, (7 * SZREG + MCONTEXT_GREGS)(v0)
++#if _MIPS_SIM != _ABIO32
++	REG_L	a4, (8 * SZREG + MCONTEXT_GREGS)(v0)
++	REG_L	a5, (9 * SZREG + MCONTEXT_GREGS)(v0)
++	REG_L	a6, (10 * SZREG + MCONTEXT_GREGS)(v0)
++	REG_L	a7, (11 * SZREG + MCONTEXT_GREGS)(v0)
++#endif
++
++	REG_L	s0, (16 * SZREG + MCONTEXT_GREGS)(v0)
++	REG_L	s1, (17 * SZREG + MCONTEXT_GREGS)(v0)
++	REG_L	s2, (18 * SZREG + MCONTEXT_GREGS)(v0)
++	REG_L	s3, (19 * SZREG + MCONTEXT_GREGS)(v0)
++	REG_L	s4, (20 * SZREG + MCONTEXT_GREGS)(v0)
++	REG_L	s5, (21 * SZREG + MCONTEXT_GREGS)(v0)
++	REG_L	s6, (22 * SZREG + MCONTEXT_GREGS)(v0)
++	REG_L	s7, (23 * SZREG + MCONTEXT_GREGS)(v0)
++#if ! defined (__PIC__) || _MIPS_SIM != _ABIO32
++	REG_L	gp, (28 * SZREG + MCONTEXT_GREGS)(v0)
++#endif
++	REG_L	sp, (29 * SZREG + MCONTEXT_GREGS)(v0)
++	REG_L	fp, (30 * SZREG + MCONTEXT_GREGS)(v0)
++	REG_L	ra, (31 * SZREG + MCONTEXT_GREGS)(v0)
++	REG_L	t9, MCONTEXT_PC(v0)
++
++	move	v0, zero
++	jr	t9
++
++99:
++#ifdef __PIC__
++	PTR_LA	t9, JUMPTARGET (__syscall_error)
++	RESTORE_GP64
++	PTR_ADDIU sp, FRAMESZ
++	jr	t9
++
++#else  /* ! __PIC__ */
++
++	j	JUMPTARGET (__syscall_error)
++#endif /* ! __PIC__ */
++PSEUDO_END (__swapcontext)
++
++weak_alias (__swapcontext, swapcontext)
+diff --git a/libc/sysdeps/linux/mips/ucontext_i.sym b/libc/sysdeps/linux/mips/ucontext_i.sym
+new file mode 100644
+index 0000000..f14b886
+--- /dev/null
++++ b/libc/sysdeps/linux/mips/ucontext_i.sym
+@@ -0,0 +1,52 @@
++#include <inttypes.h>
++#include <signal.h>
++#include <stddef.h>
++#include <sys/ucontext.h>
++
++#include <kernel_rt_sigframe.h>
++
++-- Constants used by the rt_sigprocmask call.
++
++SIG_BLOCK
++SIG_SETMASK
++
++_NSIG8				(_NSIG / 8)
++
++-- Offsets of the fields in the kernel rt_sigframe_t structure.
++#define rt_sigframe(member)	offsetof (kernel_rt_sigframe_t, member)
++
++RT_SIGFRAME_UCONTEXT		rt_sigframe (rs_uc)
++
++RT_SIGFRAME_SIZE		sizeof (kernel_rt_sigframe_t)
++
++-- Offsets of the fields in the ucontext_t structure.
++#define ucontext(member)	offsetof (ucontext_t, member)
++#define stack(member)		ucontext (uc_stack.member)
++#define mcontext(member)	ucontext (uc_mcontext.member)
++
++UCONTEXT_FLAGS			ucontext (uc_flags)
++UCONTEXT_LINK			ucontext (uc_link)
++UCONTEXT_STACK			ucontext (uc_stack)
++UCONTEXT_MCONTEXT		ucontext (uc_mcontext)
++UCONTEXT_SIGMASK		ucontext (uc_sigmask)
++
++STACK_SP			stack (ss_sp)
++STACK_SIZE			stack (ss_size)
++STACK_FLAGS			stack (ss_flags)
++
++MCONTEXT_GREGS			mcontext (gregs)
++MCONTEXT_FPREGS			mcontext (fpregs)
++MCONTEXT_MDHI			mcontext (mdhi)
++MCONTEXT_HI1			mcontext (hi1)
++MCONTEXT_HI2			mcontext (hi2)
++MCONTEXT_HI3			mcontext (hi3)
++MCONTEXT_MDLO			mcontext (mdlo)
++MCONTEXT_LO1			mcontext (lo1)
++MCONTEXT_LO2			mcontext (lo2)
++MCONTEXT_LO3			mcontext (lo3)
++MCONTEXT_PC			mcontext (pc)
++MCONTEXT_FPC_CSR		mcontext (fpc_csr)
++MCONTEXT_USED_MATH		mcontext (used_math)
++MCONTEXT_DSP			mcontext (dsp)
++
++UCONTEXT_SIZE			sizeof (ucontext_t)
+diff --git a/libc/sysdeps/linux/x86_64/Makefile.arch b/libc/sysdeps/linux/x86_64/Makefile.arch
+index 7491d92..93b8259 100644
+--- a/libc/sysdeps/linux/x86_64/Makefile.arch
++++ b/libc/sysdeps/linux/x86_64/Makefile.arch
+@@ -20,3 +20,8 @@ ifeq ($(UCLIBC_HAS_TLS),y)
+ SSRC += sched_getcpu.S
+ endif
+ endif
++
++ifeq ($(UCLIBC_HAS_CONTEXT_FUNCS),y)
++CSRC += makecontext.c
++SSRC += setcontext.S getcontext.S swapcontext.S __start_context.S
++endif
+diff --git a/libc/sysdeps/linux/x86_64/__start_context.S b/libc/sysdeps/linux/x86_64/__start_context.S
+new file mode 100644
+index 0000000..9f2ee23
+--- /dev/null
++++ b/libc/sysdeps/linux/x86_64/__start_context.S
+@@ -0,0 +1,49 @@
++/* Copyright (C) 2002-2012 Free Software Foundation, Inc.
++   This file is part of the GNU C Library.
++   Contributed by Andreas Jaeger <aj@suse.de>, 2002.
++
++   The GNU C Library is free software; you can redistribute it and/or
++   modify it under the terms of the GNU Lesser General Public
++   License as published by the Free Software Foundation; either
++   version 2.1 of the License, or (at your option) any later version.
++
++   The GNU C Library is distributed in the hope that it will be useful,
++   but WITHOUT ANY WARRANTY; without even the implied warranty of
++   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
++   Lesser General Public License for more details.
++
++   You should have received a copy of the GNU Lesser General Public
++   License along with the GNU C Library; if not, see
++   <http://www.gnu.org/licenses/>.  */
++
++#include <sysdep.h>
++
++/* This is the helper code which gets called if a function which is
++   registered with 'makecontext' returns.  In this case we have to
++   install the context listed in the uc_link element of the context
++   'makecontext' manipulated at the time of the 'makecontext' call.
++   If the pointer is NULL the process must terminate.  */
++
++
++ENTRY(__start_context)
++	/* This removes the parameters passed to the function given to
++	   'makecontext' from the stack.  RBX contains the address
++	   on the stack pointer for the next context.  */
++	movq	%rbx, %rsp
++
++	popq	%rdi			/* This is the next context.  */
++	cfi_adjust_cfa_offset(-8)
++	testq	%rdi, %rdi
++	je	2f			/* If it is zero exit.  */
++
++	call	JUMPTARGET(__setcontext)
++	/* If this returns (which can happen if the syscall fails) we'll
++	   exit the program with the return error value (-1).  */
++	movq	%rax,%rdi
++
++2:
++	call	HIDDEN_JUMPTARGET(exit)
++	/* The 'exit' call should never return.  In case it does cause
++	   the process to terminate.  */
++	hlt
++END(__start_context)
+diff --git a/libc/sysdeps/linux/x86_64/getcontext.S b/libc/sysdeps/linux/x86_64/getcontext.S
+new file mode 100644
+index 0000000..dcebc4f
+--- /dev/null
++++ b/libc/sysdeps/linux/x86_64/getcontext.S
+@@ -0,0 +1,88 @@
++/* Save current context.
++   Copyright (C) 2002-2012 Free Software Foundation, Inc.
++   This file is part of the GNU C Library.
++   Contributed by Andreas Jaeger <aj@suse.de>, 2002.
++
++   The GNU C Library is free software; you can redistribute it and/or
++   modify it under the terms of the GNU Lesser General Public
++   License as published by the Free Software Foundation; either
++   version 2.1 of the License, or (at your option) any later version.
++
++   The GNU C Library is distributed in the hope that it will be useful,
++   but WITHOUT ANY WARRANTY; without even the implied warranty of
++   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
++   Lesser General Public License for more details.
++
++   You should have received a copy of the GNU Lesser General Public
++   License along with the GNU C Library; if not, see
++   <http://www.gnu.org/licenses/>.  */
++
++#include <sysdep.h>
++
++#include "ucontext_i.h"
++
++/*  int __getcontext (ucontext_t *ucp)
++
++  Saves the machine context in UCP such that when it is activated,
++  it appears as if __getcontext() returned again.
++
++  This implementation is intended to be used for *synchronous* context
++  switches only.  Therefore, it does not have to save anything
++  other than the PRESERVED state.  */
++
++
++ENTRY(__getcontext)
++	/* Save the preserved registers, the registers used for passing
++	   args, and the return address.  */
++	movq	%rbx, oRBX(%rdi)
++	movq	%rbp, oRBP(%rdi)
++	movq	%r12, oR12(%rdi)
++	movq	%r13, oR13(%rdi)
++	movq	%r14, oR14(%rdi)
++	movq	%r15, oR15(%rdi)
++
++	movq	%rdi, oRDI(%rdi)
++	movq	%rsi, oRSI(%rdi)
++	movq	%rdx, oRDX(%rdi)
++	movq	%rcx, oRCX(%rdi)
++	movq	%r8, oR8(%rdi)
++	movq	%r9, oR9(%rdi)
++
++	movq	(%rsp), %rcx
++	movq	%rcx, oRIP(%rdi)
++	leaq	8(%rsp), %rcx		/* Exclude the return address.  */
++	movq	%rcx, oRSP(%rdi)
++
++	/* We have separate floating-point register content memory on the
++	   stack.  We use the __fpregs_mem block in the context.  Set the
++	   links up correctly.  */
++
++	leaq	oFPREGSMEM(%rdi), %rcx
++	movq	%rcx, oFPREGS(%rdi)
++	/* Save the floating-point environment.  */
++	fnstenv	(%rcx)
++	fldenv	(%rcx)
++	stmxcsr oMXCSR(%rdi)
++
++	/* Save the current signal mask with
++	   rt_sigprocmask (SIG_BLOCK, NULL, set,_NSIG/8).  */
++	leaq	oSIGMASK(%rdi), %rdx
++	xorl	%esi,%esi
++#if SIG_BLOCK == 0
++	xorl	%edi, %edi
++#else
++	movl	$SIG_BLOCK, %edi
++#endif
++	movl	$_NSIG8,%r10d
++	movl	$__NR_rt_sigprocmask, %eax
++	syscall
++	cmpq	$-4095, %rax		/* Check %rax for error.  */
++	jae	SYSCALL_ERROR_LABEL	/* Jump to error handler if error.  */
++
++	/* All done, return 0 for success.  */
++	xorl	%eax, %eax
++L(pseudo_end):
++	ret
++PSEUDO_END(__getcontext)
++
++weak_alias (__getcontext, getcontext)
+diff --git a/libc/sysdeps/linux/x86_64/makecontext.c b/libc/sysdeps/linux/x86_64/makecontext.c
+new file mode 100644
+index 0000000..5473031
+--- /dev/null
++++ b/libc/sysdeps/linux/x86_64/makecontext.c
+@@ -0,0 +1,121 @@
++/* Create new context.
++   Copyright (C) 2002, 2004, 2005, 2008 Free Software Foundation, Inc.
++   This file is part of the GNU C Library.
++   Contributed by Andreas Jaeger <aj@suse.de>, 2002.
++
++   The GNU C Library is free software; you can redistribute it and/or
++   modify it under the terms of the GNU Lesser General Public
++   License as published by the Free Software Foundation; either
++   version 2.1 of the License, or (at your option) any later version.
++
++   The GNU C Library is distributed in the hope that it will be useful,
++   but WITHOUT ANY WARRANTY; without even the implied warranty of
++   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
++   Lesser General Public License for more details.
++
++   You should have received a copy of the GNU Lesser General Public
++   License along with the GNU C Library; if not, see
++   <http://www.gnu.org/licenses/>.  */
++
++#include <sysdep.h>
++#include <stdarg.h>
++#include <stdint.h>
++#include <ucontext.h>
++
++#include "ucontext_i.h"
++
++/* This implementation can handle any ARGC value but only
++   normal integer parameters.
++   makecontext sets up a stack and the registers for the
++   user context. The stack looks like this:
++               +-----------------------+
++               | next context          |
++               +-----------------------+
++               | parameter 7-n         |
++	       +-----------------------+
++	       | trampoline address    |
++    %rsp ->    +-----------------------+
++
++   The registers are set up like this:
++     %rdi,%rsi,%rdx,%rcx,%r8,%r9: parameter 1 to 6
++     %rbx   : address of next context
++     %rsp   : stack pointer.
++*/
++
++/* XXX: This implementation currently only handles integer arguments.
++   To handle long int and pointer arguments the va_arg arguments needs
++   to be changed to long and also the stdlib/tst-setcontext.c file needs
++   to be changed to pass long arguments to makecontext.  */
++
++
++void
++__makecontext (ucontext_t *ucp, void (*func) (void), int argc, ...)
++{
++  extern void __start_context (void);
++  greg_t *sp;
++  unsigned int idx_uc_link;
++  va_list ap;
++  int i;
++
++  /* Generate room on stack for parameter if needed and uc_link.  */
++  sp = (greg_t *) ((uintptr_t) ucp->uc_stack.ss_sp
++		   + ucp->uc_stack.ss_size);
++  sp -= (argc > 6 ? argc - 6 : 0) + 1;
++  /* Align stack and make space for trampoline address.  */
++  sp = (greg_t *) ((((uintptr_t) sp) & -16L) - 8);
++
++  idx_uc_link = (argc > 6 ? argc - 6 : 0) + 1;
++
++  /* Setup context ucp.  */
++  /* Address to jump to.  */
++  ucp->uc_mcontext.gregs[REG_RIP] = (uintptr_t) func;
++  /* Setup rbx.*/
++  ucp->uc_mcontext.gregs[REG_RBX] = (uintptr_t) &sp[idx_uc_link];
++  ucp->uc_mcontext.gregs[REG_RSP] = (uintptr_t) sp;
++
++  /* Setup stack.  */
++  sp[0] = (uintptr_t) &__start_context;
++  sp[idx_uc_link] = (uintptr_t) ucp->uc_link;
++
++  va_start (ap, argc);
++  /* Handle arguments.
++
++     The standard says the parameters must all be int values.  This is
++     an historic accident and would be done differently today.  For
++     x86-64 all integer values are passed as 64-bit values and
++     therefore extending the API to copy 64-bit values instead of
++     32-bit ints makes sense.  It does not break existing
++     functionality and it does not violate the standard which says
++     that passing non-int values means undefined behavior.  */
++  for (i = 0; i < argc; ++i)
++    switch (i)
++      {
++      case 0:
++	ucp->uc_mcontext.gregs[REG_RDI] = va_arg (ap, greg_t);
++	break;
++      case 1:
++	ucp->uc_mcontext.gregs[REG_RSI] = va_arg (ap, greg_t);
++	break;
++      case 2:
++	ucp->uc_mcontext.gregs[REG_RDX] = va_arg (ap, greg_t);
++	break;
++      case 3:
++	ucp->uc_mcontext.gregs[REG_RCX] = va_arg (ap, greg_t);
++	break;
++      case 4:
++	ucp->uc_mcontext.gregs[REG_R8] = va_arg (ap, greg_t);
++	break;
++      case 5:
++	ucp->uc_mcontext.gregs[REG_R9] = va_arg (ap, greg_t);
++	break;
++      default:
++	/* Put value on stack.  */
++	sp[i - 5] = va_arg (ap, greg_t);
++	break;
++      }
++  va_end (ap);
++
++}
++
++
++weak_alias (__makecontext, makecontext)
+diff --git a/libc/sysdeps/linux/x86_64/setcontext.S b/libc/sysdeps/linux/x86_64/setcontext.S
+new file mode 100644
+index 0000000..561ab9f
+--- /dev/null
++++ b/libc/sysdeps/linux/x86_64/setcontext.S
+@@ -0,0 +1,103 @@
++/* Install given context.
++   Copyright (C) 2002-2012 Free Software Foundation, Inc.
++   This file is part of the GNU C Library.
++   Contributed by Andreas Jaeger <aj@suse.de>, 2002.
++
++   The GNU C Library is free software; you can redistribute it and/or
++   modify it under the terms of the GNU Lesser General Public
++   License as published by the Free Software Foundation; either
++   version 2.1 of the License, or (at your option) any later version.
++
++   The GNU C Library is distributed in the hope that it will be useful,
++   but WITHOUT ANY WARRANTY; without even the implied warranty of
++   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
++   Lesser General Public License for more details.
++
++   You should have received a copy of the GNU Lesser General Public
++   License along with the GNU C Library; if not, see
++   <http://www.gnu.org/licenses/>.  */
++
++#include <sysdep.h>
++
++#include "ucontext_i.h"
++
++
++/*  int __setcontext (const ucontext_t *ucp)
++
++  Restores the machine context in UCP and thereby resumes execution
++  in that context.
++
++  This implementation is intended to be used for *synchronous* context
++  switches only.  Therefore, it does not have to restore anything
++  other than the PRESERVED state.  */
++
++ENTRY(__setcontext)
++	/* Save argument since syscall will destroy it.  */
++	pushq	%rdi
++	cfi_adjust_cfa_offset(8)
++
++	/* Set the signal mask with
++	   rt_sigprocmask (SIG_SETMASK, mask, NULL, _NSIG/8).  */
++	leaq	oSIGMASK(%rdi), %rsi
++	xorl	%edx, %edx
++	movl	$SIG_SETMASK, %edi
++	movl	$_NSIG8,%r10d
++	movl	$__NR_rt_sigprocmask, %eax
++	syscall
++	popq	%rdi			/* Reload %rdi, adjust stack.  */
++	cfi_adjust_cfa_offset(-8)
++	cmpq	$-4095, %rax		/* Check %rax for error.  */
++	jae	SYSCALL_ERROR_LABEL	/* Jump to error handler if error.  */
++
++	/* Restore the floating-point context.  Not the registers, only the
++	   rest.  */
++	movq	oFPREGS(%rdi), %rcx
++	fldenv	(%rcx)
++	ldmxcsr oMXCSR(%rdi)
++
++
++	/* Load the new stack pointer, the preserved registers and
++	   registers used for passing args.  */
++	cfi_def_cfa(%rdi, 0)
++	cfi_offset(%rbx,oRBX)
++	cfi_offset(%rbp,oRBP)
++	cfi_offset(%r12,oR12)
++	cfi_offset(%r13,oR13)
++	cfi_offset(%r14,oR14)
++	cfi_offset(%r15,oR15)
++	cfi_offset(%rsp,oRSP)
++	cfi_offset(%rip,oRIP)
++
++	movq	oRSP(%rdi), %rsp
++	movq	oRBX(%rdi), %rbx
++	movq	oRBP(%rdi), %rbp
++	movq	oR12(%rdi), %r12
++	movq	oR13(%rdi), %r13
++	movq	oR14(%rdi), %r14
++	movq	oR15(%rdi), %r15
++
++	/* The following ret should return to the address set with
++	getcontext.  Therefore push the address on the stack.  */
++	movq	oRIP(%rdi), %rcx
++	pushq	%rcx
++
++	movq	oRSI(%rdi), %rsi
++	movq	oRDX(%rdi), %rdx
++	movq	oRCX(%rdi), %rcx
++	movq	oR8(%rdi), %r8
++	movq	oR9(%rdi), %r9
++
++	/* Setup finally  %rdi.  */
++	movq	oRDI(%rdi), %rdi
++
++	/* End FDE here, we fall into another context.  */
++	cfi_endproc
++	cfi_startproc
++
++	/* Clear rax to indicate success.  */
++	xorl	%eax, %eax
++L(pseudo_end):
++	ret
++PSEUDO_END(__setcontext)
++
++weak_alias (__setcontext, setcontext)
+diff --git a/libc/sysdeps/linux/x86_64/swapcontext.S b/libc/sysdeps/linux/x86_64/swapcontext.S
+new file mode 100644
+index 0000000..6d2ebb8
+--- /dev/null
++++ b/libc/sysdeps/linux/x86_64/swapcontext.S
+@@ -0,0 +1,121 @@
++/* Save current context and install the given one.
++   Copyright (C) 2002-2012 Free Software Foundation, Inc.
++   This file is part of the GNU C Library.
++   Contributed by Andreas Jaeger <aj@suse.de>, 2002.
++
++   The GNU C Library is free software; you can redistribute it and/or
++   modify it under the terms of the GNU Lesser General Public
++   License as published by the Free Software Foundation; either
++   version 2.1 of the License, or (at your option) any later version.
++
++   The GNU C Library is distributed in the hope that it will be useful,
++   but WITHOUT ANY WARRANTY; without even the implied warranty of
++   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
++   Lesser General Public License for more details.
++
++   You should have received a copy of the GNU Lesser General Public
++   License along with the GNU C Library; if not, see
++   <http://www.gnu.org/licenses/>.  */
++
++#include <sysdep.h>
++
++#include "ucontext_i.h"
++
++
++/* int __swapcontext (ucontext_t *oucp, const ucontext_t *ucp);
++
++  Saves the machine context in oucp such that when it is activated,
++  it appears as if __swapcontextt() returned again, restores the
++  machine context in ucp and thereby resumes execution in that
++  context.
++
++  This implementation is intended to be used for *synchronous* context
++  switches only.  Therefore, it does not have to save anything
++  other than the PRESERVED state.  */
++
++ENTRY(__swapcontext)
++	/* Save the preserved registers, the registers used for passing args,
++	   and the return address.  */
++	movq	%rbx, oRBX(%rdi)
++	movq	%rbp, oRBP(%rdi)
++	movq	%r12, oR12(%rdi)
++	movq	%r13, oR13(%rdi)
++	movq	%r14, oR14(%rdi)
++	movq	%r15, oR15(%rdi)
++
++	movq	%rdi, oRDI(%rdi)
++	movq	%rsi, oRSI(%rdi)
++	movq	%rdx, oRDX(%rdi)
++	movq	%rcx, oRCX(%rdi)
++	movq	%r8, oR8(%rdi)
++	movq	%r9, oR9(%rdi)
++
++	movq	(%rsp), %rcx
++	movq	%rcx, oRIP(%rdi)
++	leaq	8(%rsp), %rcx		/* Exclude the return address.  */
++	movq	%rcx, oRSP(%rdi)
++
++	/* We have separate floating-point register content memory on the
++	   stack.  We use the __fpregs_mem block in the context.  Set the
++	   links up correctly.  */
++	leaq	oFPREGSMEM(%rdi), %rcx
++	movq	%rcx, oFPREGS(%rdi)
++	/* Save the floating-point environment.  */
++	fnstenv	(%rcx)
++	stmxcsr oMXCSR(%rdi)
++
++
++	/* The syscall destroys some registers, save them.  */
++	movq	%rsi, %r12
++
++	/* Save the current signal mask and install the new one with
++	   rt_sigprocmask (SIG_BLOCK, newset, oldset,_NSIG/8).  */
++	leaq	oSIGMASK(%rdi), %rdx
++	leaq	oSIGMASK(%rsi), %rsi
++	movl	$SIG_SETMASK, %edi
++	movl	$_NSIG8,%r10d
++	movl	$__NR_rt_sigprocmask, %eax
++	syscall
++	cmpq	$-4095, %rax		/* Check %rax for error.  */
++	jae	SYSCALL_ERROR_LABEL	/* Jump to error handler if error.  */
++
++	/* Restore destroyed registers.  */
++	movq	%r12, %rsi
++
++	/* Restore the floating-point context.  Not the registers, only the
++	   rest.  */
++	movq	oFPREGS(%rsi), %rcx
++	fldenv	(%rcx)
++	ldmxcsr oMXCSR(%rsi)
++
++	/* Load the new stack pointer and the preserved registers.  */
++	movq	oRSP(%rsi), %rsp
++	movq	oRBX(%rsi), %rbx
++	movq	oRBP(%rsi), %rbp
++	movq	oR12(%rsi), %r12
++	movq	oR13(%rsi), %r13
++	movq	oR14(%rsi), %r14
++	movq	oR15(%rsi), %r15
++
++	/* The following ret should return to the address set with
++	getcontext.  Therefore push the address on the stack.  */
++	movq	oRIP(%rsi), %rcx
++	pushq	%rcx
++
++	/* Setup registers used for passing args.  */
++	movq	oRDI(%rsi), %rdi
++	movq	oRDX(%rsi), %rdx
++	movq	oRCX(%rsi), %rcx
++	movq	oR8(%rsi), %r8
++	movq	oR9(%rsi), %r9
++
++	/* Setup finally  %rsi.  */
++	movq	oRSI(%rsi), %rsi
++
++	/* Clear rax to indicate success.  */
++	xorl	%eax, %eax
++L(pseudo_end):
++	ret
++PSEUDO_END(__swapcontext)
++
++weak_alias (__swapcontext, swapcontext)
+diff --git a/libc/sysdeps/linux/x86_64/ucontext_i.sym b/libc/sysdeps/linux/x86_64/ucontext_i.sym
+new file mode 100644
+index 0000000..af3e0e5
+--- /dev/null
++++ b/libc/sysdeps/linux/x86_64/ucontext_i.sym
+@@ -0,0 +1,37 @@
++#include <stddef.h>
++#include <signal.h>
++#include <sys/ucontext.h>
++
++--
++
++SIG_BLOCK
++SIG_SETMASK
++
++_NSIG8		(_NSIG / 8)
++
++#define ucontext(member)	offsetof (ucontext_t, member)
++#define mcontext(member)	ucontext (uc_mcontext.member)
++#define mreg(reg)		mcontext (gregs[REG_##reg])
++
++oRBP		mreg (RBP)
++oRSP		mreg (RSP)
++oRBX		mreg (RBX)
++oR8		mreg (R8)
++oR9		mreg (R9)
++oR10		mreg (R10)
++oR11		mreg (R11)
++oR12		mreg (R12)
++oR13		mreg (R13)
++oR14		mreg (R14)
++oR15		mreg (R15)
++oRDI		mreg (RDI)
++oRSI		mreg (RSI)
++oRDX		mreg (RDX)
++oRAX		mreg (RAX)
++oRCX		mreg (RCX)
++oRIP		mreg (RIP)
++oEFL		mreg (EFL)
++oFPREGS		mcontext (fpregs)
++oSIGMASK	ucontext (uc_sigmask)
++oFPREGSMEM	ucontext (__fpregs_mem)
++oMXCSR		ucontext (__fpregs_mem.mxcsr)
+diff --git a/libpthread/nptl/sysdeps/Makefile.commonarch b/libpthread/nptl/sysdeps/Makefile.commonarch
+index 0c19216..8f5d61d 100644
+--- a/libpthread/nptl/sysdeps/Makefile.commonarch
++++ b/libpthread/nptl/sysdeps/Makefile.commonarch
+@@ -47,9 +47,8 @@ $(libpthread_arch_OUT)/gen_tcb-offsets.c: $(libpthread_arch_DIR)/tcb-offsets.sym
+ $(libpthread_arch_OUT)/gen_tcb-offsets.s: $(libpthread_arch_OUT)/gen_tcb-offsets.c | headers
+ 	$(compile.c)
+ libpthread-generated-y += $(libpthread_arch_OUT)/gen_tcb-offsets.s
+-PTHREAD_TCB_OFFSET_MANGLE ?= -n "s/^.*@@@name@@@\([^@]*\)@@@value@@@[^0-9Xxa-fA-F-]*\([0-9Xxa-fA-F-][0-9Xxa-fA-F-]*\).*@@@end@@@.*\$$/\#define \1 \2/p"
+ $(libpthread_arch_OUT)/tcb-offsets.h: $(libpthread_arch_OUT)/gen_tcb-offsets.s
+-	$(do_sed) $(PTHREAD_TCB_OFFSET_MANGLE) $< > $@
++	$(do_sed) $(PTHREAD_GENERATE_MANGLE) $< > $@
+ 	@if test ! -s $@ ; then rm -f $@ ; false ; fi
+ 
+ pregen-headers-$(UCLIBC_HAS_THREADS_NATIVE) += $(libpthread_arch_OUT)/tcb-offsets.h
+diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/Makefile.commonarch b/libpthread/nptl/sysdeps/unix/sysv/linux/Makefile.commonarch
+index 477fb1a..3372214 100644
+--- a/libpthread/nptl/sysdeps/unix/sysv/linux/Makefile.commonarch
++++ b/libpthread/nptl/sysdeps/unix/sysv/linux/Makefile.commonarch
+@@ -177,8 +177,6 @@ CFLAGS-gen_pthread-pi-defines.c = -S
+ CFLAGS-gen_structsem.c = -S
+ CFLAGS-gen_unwindbuf.c = -S
+ 
+-PTHREAD_GENERATE_MANGLE ?= -n "s/^.*@@@name@@@\([^@]*\)@@@value@@@[^0-9Xxa-fA-F-]*\([0-9Xxa-fA-F-][0-9Xxa-fA-F-]*\).*@@@end@@@.*\$$/\#define \1 \2/p"
+-
+ PTHREAD_LINUX_SYM   := $(notdir $(wildcard $(libpthread_linux_DIR)/*.sym))
+ PTHREAD_LINUX_SYM_C := $(addprefix $(libpthread_linux_OUT)/gen_,$(PTHREAD_LINUX_SYM:.sym=.c))
+ PTHREAD_LINUX_SYM_S := $(PTHREAD_LINUX_SYM_C:.c=.s)
+-- 
+2.2.0.rc0.207.ga3a616c
+
diff --git a/package/uclibc/uclibc.mk b/package/uclibc/uclibc.mk
index 3180885..5fb4e56 100644
--- a/package/uclibc/uclibc.mk
+++ b/package/uclibc/uclibc.mk
@@ -409,6 +409,8 @@ define UCLIBC_KCONFIG_FIXUP_CMDS
 	$(call KCONFIG_SET_OPT,RUNTIME_PREFIX,"/",$(@D)/.config)
 	$(call KCONFIG_SET_OPT,DEVEL_PREFIX,"/usr",$(@D)/.config)
 	$(call KCONFIG_SET_OPT,SHARED_LIB_LOADER_PREFIX,"/lib",$(@D)/.config)
+	$(call KCONFIG_ENABLE_OPT,UCLIBC_SUSV3_LEGACY,$(@D)/.config)
+	$(call KCONFIG_ENABLE_OPT,UCLIBC_HAS_CONTEXT_FUNCS,$(@D)/.config)
 	$(UCLIBC_MMU_CONFIG)
 	$(UCLIBC_ARM_ABI_CONFIG)
 	$(UCLIBC_ARM_BX_CONFIG)
-- 
2.4.3.573.g4eafbef