arch/parisc/hpux/wrappers.S - kernel/prism - Git at Google

 /*
  * Linux/PARISC Project (http://www.parisc-linux.org/)
  *
  * HP-UX System Call Wrapper routines and System Call Return Path
  *
  * Copyright (C) 2000 Hewlett-Packard (John Marvin)
  *
  *    This program is free software; you can redistribute it and/or modify
  *    it under the terms of the GNU General Public License as published by
  *    the Free Software Foundation; either version 2, or (at your option)
  *    any later version.
  *
  *    This program 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 General Public License for more details.
  *
  *    You should have received a copy of the GNU General Public License
  *    along with this program; if not, write to the Free Software
  *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */

 #ifdef CONFIG_64BIT
 #warning PA64 support needs more work...did first cut
 #endif

 #include <asm/asm-offsets.h>
 #include <asm/assembly.h>
 #include <asm/signal.h>
 #include <linux/linkage.h>

 	.level	LEVEL
 	.text

 	/* These should probably go in a header file somewhere.
 	 * They are duplicated in kernel/wrappers.S
 	 * Possibly we should consider consolidating these
 	 * register save/restore macros.
 	 */
 	.macro	reg_save regs
 #ifdef CONFIG_64BIT
 #warning NEEDS WORK for 64-bit
 #endif
 	STREG	%r3, PT_GR3(\regs)
 	STREG	%r4, PT_GR4(\regs)
 	STREG	%r5, PT_GR5(\regs)
 	STREG	%r6, PT_GR6(\regs)
 	STREG	%r7, PT_GR7(\regs)
 	STREG	%r8, PT_GR8(\regs)
 	STREG	%r9, PT_GR9(\regs)
 	STREG	%r10,PT_GR10(\regs)
 	STREG	%r11,PT_GR11(\regs)
 	STREG	%r12,PT_GR12(\regs)
 	STREG	%r13,PT_GR13(\regs)
 	STREG	%r14,PT_GR14(\regs)
 	STREG	%r15,PT_GR15(\regs)
 	STREG	%r16,PT_GR16(\regs)
 	STREG	%r17,PT_GR17(\regs)
 	STREG	%r18,PT_GR18(\regs)
 	.endm

 	.macro	reg_restore regs
 	LDREG	PT_GR3(\regs), %r3
 	LDREG	PT_GR4(\regs), %r4
 	LDREG	PT_GR5(\regs), %r5
 	LDREG	PT_GR6(\regs), %r6
 	LDREG	PT_GR7(\regs), %r7
 	LDREG	PT_GR8(\regs), %r8
 	LDREG	PT_GR9(\regs), %r9
 	LDREG	PT_GR10(\regs),%r10
 	LDREG	PT_GR11(\regs),%r11
 	LDREG	PT_GR12(\regs),%r12
 	LDREG	PT_GR13(\regs),%r13
 	LDREG	PT_GR14(\regs),%r14
 	LDREG	PT_GR15(\regs),%r15
 	LDREG	PT_GR16(\regs),%r16
 	LDREG	PT_GR17(\regs),%r17
 	LDREG	PT_GR18(\regs),%r18
 	.endm


 	.import sys_fork

 ENTRY(hpux_fork_wrapper)
 	ldo	TASK_REGS-TASK_SZ_ALGN-64(%r30),%r1	    ;! get pt regs
 							    ;! pointer in task
 	reg_save %r1

 	STREG	%r2,-20(%r30)
 	ldo	64(%r30),%r30
 	STREG	%r2,PT_GR19(%r1)	;! save for child
 	STREG	%r30,PT_GR21(%r1)	;! save for child

 	LDREG	PT_GR30(%r1),%r25
 	mtctl	%r25,%cr29
 	copy	%r1,%r24
 	bl	sys_clone,%r2
 	ldi	SIGCHLD,%r26

 	LDREG	-84(%r30),%r2
 fork_return:
 	ldo	-64(%r30),%r30
 	ldo	TASK_REGS-TASK_SZ_ALGN-64(%r30),%r1	    ;! get pt regs

 	reg_restore %r1

 	/*
 	 * HP-UX wants pid (child gets parent pid, parent gets child pid)
 	 * in r28 and a flag in r29 (r29 == 1 for child, 0 for parent).
 	 * Linux fork returns 0 for child, pid for parent. Since HP-UX
 	 * libc stub throws away parent pid and returns 0 for child,
 	 * we'll just return 0 for parent pid now. Only applications
 	 * that jump directly to the gateway page (not supported) will
 	 * know the difference. We can fix this later if necessary.
 	 */

 	ldo	-1024(%r0),%r1
 	comb,>>=,n %r28,%r1,fork_exit  /* just let the syscall exit handle it */
 	or,=	%r28,%r0,%r0
 	or,tr	%r0,%r0,%r29	/* r28 <> 0, we are parent, set r29 to 0 */
 	ldo	1(%r0),%r29 	/* r28 == 0, we are child,  set r29 to 1 */

 fork_exit:
 	bv	%r0(%r2)
 	nop
 ENDPROC(hpux_fork_wrapper)

 	/* Set the return value for the child */

 ENTRY(hpux_child_return)
 #if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT)
 	bl,n	schedule_tail, %r2
 #endif

 	LDREG	TASK_PT_GR19-TASK_SZ_ALGN-128(%r30),%r2
 	b fork_return
 	copy %r0,%r28
 ENDPROC(hpux_child_return)

 	.import hpux_execve

 ENTRY(hpux_execv_wrapper)
 	copy %r0,%r24  /* NULL environment */

 ENTRY(hpux_execve_wrapper)

 	ldo	TASK_REGS-TASK_SZ_ALGN-64(%r30),%r1	    ;! get pt regs

 	/*
 	 * Do we need to save/restore r3-r18 here?
 	 * I don't think so. why would new thread need old
 	 * threads registers?
 	 */

 	/* Store arg0, arg1 and arg2 so that hpux_execve will find them */

 	STREG %r26,PT_GR26(%r1)
 	STREG %r25,PT_GR25(%r1)
 	STREG %r24,PT_GR24(%r1)

 	STREG %r2,-20(%r30)
 	ldo 64(%r30),%r30
 	bl hpux_execve,%r2
 	copy %r1,%arg0

 	ldo -64(%r30),%r30
 	LDREG	-20(%r30),%r2

 	/* If exec succeeded we need to load the args */

 	ldo -1024(%r0),%r1
 	comb,>>= %r28,%r1,exec_error
 	copy %r2,%r19
 	ldo	-TASK_SZ_ALGN-64(%r30),%r1	   ;! get task ptr
 	LDREG	TASK_PT_GR26(%r1),%r26
 	LDREG	TASK_PT_GR25(%r1),%r25
 	LDREG	TASK_PT_GR24(%r1),%r24
 	LDREG	TASK_PT_GR23(%r1),%r23
 	copy %r0,%r2	/* Flag to syscall_exit not to clear args */

 exec_error:
 	bv %r0(%r19)
 	nop
 ENDPROC(hpux_execv_wrapper)

 	.import hpux_pipe

 	/* HP-UX expects pipefd's returned in r28 & r29 */

 ENTRY(hpux_pipe_wrapper)
 	STREG %r2,-20(%r30)
 	ldo 64(%r30),%r30
 	bl hpux_pipe,%r2
 	ldo -56(%r30),%r26 /* pass local array to hpux_pipe */


 	ldo -1024(%r0),%r1
 	comb,>>= %r28,%r1,pipe_exit /* let syscall exit handle it */
 	LDREG	-84(%r30),%r2

 	/* if success, load fd's from stack array */

 	LDREG	-56(%r30),%r28
 	LDREG	-52(%r30),%r29

 pipe_exit:
 	bv %r0(%r2)
 	ldo -64(%r30),%r30
 ENDPROC(hpux_pipe_wrapper)

 	.import syscall_exit

 ENTRY(hpux_syscall_exit)
 	/*
 	 *
 	 * HP-UX call return conventions:
 	 *
 	 * if error:
 	 *	 r22 = 1
 	 *	 r28 = errno value
 	 *	 r29 = secondary return value
 	 * else
 	 *	 r22 = 0
 	 *	 r28 = return value
 	 *	 r29 = secondary return value
 	 *
 	 * For now, we'll just check to see if r28 is < (unsigned long)-1024
 	 * (to handle addresses > 2 Gb) and if so set r22 to zero. If not,
 	 * we'll complement r28 and set r22 to 1. Wrappers will be
 	 * needed for syscalls that care about the secondary return value.
 	 * The wrapper may also need a way of avoiding the following code,
 	 * but we'll deal with that when it becomes necessary.
 	 */

 	ldo -1024(%r0),%r1
 	comb,<< %r28,%r1,no_error
 	copy %r0,%r22
 	subi 0,%r28,%r28
 	ldo 1(%r0),%r22

 no_error:
 	b,n syscall_exit
 ENDPROC(hpux_syscall_exit)

 	.import hpux_unimplemented

 ENTRY(hpux_unimplemented_wrapper)
 	b hpux_unimplemented
 	STREG %r22,-64(%r30)  /* overwrite arg8 with syscall number */
 ENDPROC(hpux_unimplemented_wrapper)
	/*
	* Linux/PARISC Project (http://www.parisc-linux.org/)
	*
	* HP-UX System Call Wrapper routines and System Call Return Path
	*
	* Copyright (C) 2000 Hewlett-Packard (John Marvin)
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2, or (at your option)
	* any later version.
	*
	* This program 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 General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	*/

	#ifdef CONFIG_64BIT
	#warning PA64 support needs more work...did first cut
	#endif

	#include <asm/asm-offsets.h>
	#include <asm/assembly.h>
	#include <asm/signal.h>
	#include <linux/linkage.h>

	.level LEVEL
	.text

	/* These should probably go in a header file somewhere.
	* They are duplicated in kernel/wrappers.S
	* Possibly we should consider consolidating these
	* register save/restore macros.
	*/
	.macro reg_save regs
	#ifdef CONFIG_64BIT
	#warning NEEDS WORK for 64-bit
	#endif
	STREG %r3, PT_GR3(\regs)
	STREG %r4, PT_GR4(\regs)
	STREG %r5, PT_GR5(\regs)
	STREG %r6, PT_GR6(\regs)
	STREG %r7, PT_GR7(\regs)
	STREG %r8, PT_GR8(\regs)
	STREG %r9, PT_GR9(\regs)
	STREG %r10,PT_GR10(\regs)
	STREG %r11,PT_GR11(\regs)
	STREG %r12,PT_GR12(\regs)
	STREG %r13,PT_GR13(\regs)
	STREG %r14,PT_GR14(\regs)
	STREG %r15,PT_GR15(\regs)
	STREG %r16,PT_GR16(\regs)
	STREG %r17,PT_GR17(\regs)
	STREG %r18,PT_GR18(\regs)
	.endm

	.macro reg_restore regs
	LDREG PT_GR3(\regs), %r3
	LDREG PT_GR4(\regs), %r4
	LDREG PT_GR5(\regs), %r5
	LDREG PT_GR6(\regs), %r6
	LDREG PT_GR7(\regs), %r7
	LDREG PT_GR8(\regs), %r8
	LDREG PT_GR9(\regs), %r9
	LDREG PT_GR10(\regs),%r10
	LDREG PT_GR11(\regs),%r11
	LDREG PT_GR12(\regs),%r12
	LDREG PT_GR13(\regs),%r13
	LDREG PT_GR14(\regs),%r14
	LDREG PT_GR15(\regs),%r15
	LDREG PT_GR16(\regs),%r16
	LDREG PT_GR17(\regs),%r17
	LDREG PT_GR18(\regs),%r18
	.endm


	.import sys_fork

	ENTRY(hpux_fork_wrapper)
	ldo TASK_REGS-TASK_SZ_ALGN-64(%r30),%r1 ;! get pt regs
	;! pointer in task
	reg_save %r1

	STREG %r2,-20(%r30)
	ldo 64(%r30),%r30
	STREG %r2,PT_GR19(%r1) ;! save for child
	STREG %r30,PT_GR21(%r1) ;! save for child

	LDREG PT_GR30(%r1),%r25
	mtctl %r25,%cr29
	copy %r1,%r24
	bl sys_clone,%r2
	ldi SIGCHLD,%r26

	LDREG -84(%r30),%r2
	fork_return:
	ldo -64(%r30),%r30
	ldo TASK_REGS-TASK_SZ_ALGN-64(%r30),%r1 ;! get pt regs

	reg_restore %r1

	/*
	* HP-UX wants pid (child gets parent pid, parent gets child pid)
	* in r28 and a flag in r29 (r29 == 1 for child, 0 for parent).
	* Linux fork returns 0 for child, pid for parent. Since HP-UX
	* libc stub throws away parent pid and returns 0 for child,
	* we'll just return 0 for parent pid now. Only applications
	* that jump directly to the gateway page (not supported) will
	* know the difference. We can fix this later if necessary.
	*/

	ldo -1024(%r0),%r1
	comb,>>=,n %r28,%r1,fork_exit /* just let the syscall exit handle it */
	or,= %r28,%r0,%r0
	or,tr %r0,%r0,%r29 /* r28 <> 0, we are parent, set r29 to 0 */
	ldo 1(%r0),%r29 /* r28 == 0, we are child, set r29 to 1 */

	fork_exit:
	bv %r0(%r2)
	nop
	ENDPROC(hpux_fork_wrapper)

	/* Set the return value for the child */

	ENTRY(hpux_child_return)
	#if defined(CONFIG_SMP) \|\| defined(CONFIG_PREEMPT)
	bl,n schedule_tail, %r2
	#endif

	LDREG TASK_PT_GR19-TASK_SZ_ALGN-128(%r30),%r2
	b fork_return
	copy %r0,%r28
	ENDPROC(hpux_child_return)

	.import hpux_execve

	ENTRY(hpux_execv_wrapper)
	copy %r0,%r24 /* NULL environment */

	ENTRY(hpux_execve_wrapper)

	ldo TASK_REGS-TASK_SZ_ALGN-64(%r30),%r1 ;! get pt regs

	/*
	* Do we need to save/restore r3-r18 here?
	* I don't think so. why would new thread need old
	* threads registers?
	*/

	/* Store arg0, arg1 and arg2 so that hpux_execve will find them */

	STREG %r26,PT_GR26(%r1)
	STREG %r25,PT_GR25(%r1)
	STREG %r24,PT_GR24(%r1)

	STREG %r2,-20(%r30)
	ldo 64(%r30),%r30
	bl hpux_execve,%r2
	copy %r1,%arg0

	ldo -64(%r30),%r30
	LDREG -20(%r30),%r2

	/* If exec succeeded we need to load the args */

	ldo -1024(%r0),%r1
	comb,>>= %r28,%r1,exec_error
	copy %r2,%r19
	ldo -TASK_SZ_ALGN-64(%r30),%r1 ;! get task ptr
	LDREG TASK_PT_GR26(%r1),%r26
	LDREG TASK_PT_GR25(%r1),%r25
	LDREG TASK_PT_GR24(%r1),%r24
	LDREG TASK_PT_GR23(%r1),%r23
	copy %r0,%r2 /* Flag to syscall_exit not to clear args */

	exec_error:
	bv %r0(%r19)
	nop
	ENDPROC(hpux_execv_wrapper)

	.import hpux_pipe

	/* HP-UX expects pipefd's returned in r28 & r29 */

	ENTRY(hpux_pipe_wrapper)
	STREG %r2,-20(%r30)
	ldo 64(%r30),%r30
	bl hpux_pipe,%r2
	ldo -56(%r30),%r26 /* pass local array to hpux_pipe */


	ldo -1024(%r0),%r1
	comb,>>= %r28,%r1,pipe_exit /* let syscall exit handle it */
	LDREG -84(%r30),%r2

	/* if success, load fd's from stack array */

	LDREG -56(%r30),%r28
	LDREG -52(%r30),%r29

	pipe_exit:
	bv %r0(%r2)
	ldo -64(%r30),%r30
	ENDPROC(hpux_pipe_wrapper)

	.import syscall_exit

	ENTRY(hpux_syscall_exit)
	/*
	*
	* HP-UX call return conventions:
	*
	* if error:
	* r22 = 1
	* r28 = errno value
	* r29 = secondary return value
	* else
	* r22 = 0
	* r28 = return value
	* r29 = secondary return value
	*
	* For now, we'll just check to see if r28 is < (unsigned long)-1024
	* (to handle addresses > 2 Gb) and if so set r22 to zero. If not,
	* we'll complement r28 and set r22 to 1. Wrappers will be
	* needed for syscalls that care about the secondary return value.
	* The wrapper may also need a way of avoiding the following code,
	* but we'll deal with that when it becomes necessary.
	*/

	ldo -1024(%r0),%r1
	comb,<< %r28,%r1,no_error
	copy %r0,%r22
	subi 0,%r28,%r28
	ldo 1(%r0),%r22

	no_error:
	b,n syscall_exit
	ENDPROC(hpux_syscall_exit)

	.import hpux_unimplemented

	ENTRY(hpux_unimplemented_wrapper)
	b hpux_unimplemented
	STREG %r22,-64(%r30) /* overwrite arg8 with syscall number */
	ENDPROC(hpux_unimplemented_wrapper)