blob: 81bec28bdc4844c8429f6a917bc2e907b2b64b61 [file] [log] [blame]
/* In a deft move of uber-hackery, we decide to carry the top half of all
* 64-bit registers in a non-portable, non-ABI, hidden structure.
* Userspace can read the hidden structure if it *wants* but is never
* guaranteed to be in the same place. Infact the uc_sigmask from the
* ucontext_t structure may push the hidden register file downards
struct compat_regfile {
/* Upper half of all the 64-bit registers that were truncated
on a copy to a 32-bit userspace */
compat_int_t rf_gr[32];
compat_int_t rf_iasq[2];
compat_int_t rf_iaoq[2];
compat_int_t rf_sar;
struct compat_rt_sigframe {
/* XXX: Must match trampoline size in arch/parisc/kernel/signal.c
Secondary to that it must protect the ERESTART_RESTARTBLOCK
trampoline we left on the stack (we were bad and didn't
change sp so we could run really fast.) */
compat_uint_t tramp[COMPAT_TRAMP_SIZE];
compat_siginfo_t info;
struct compat_ucontext uc;
/* Hidden location of truncated registers, *must* be last. */
struct compat_regfile regs;
* The 32-bit ABI wants at least 48 bytes for a function call frame:
* 16 bytes for arg0-arg3, and 32 bytes for magic (the only part of
* which Linux/parisc uses is sp-20 for the saved return pointer...)
* Then, the stack pointer must be rounded to a cache line (64 bytes).
#define SIGFRAME32 64
(((sizeof(struct compat_rt_sigframe) + FUNCTIONCALLFRAME32) + SIGFRAME32) & -SIGFRAME32)