LXR linux/arch/parisc/include/asm/compat_rt

   1#include<linux/compat.h>
   2#include<linux/compat_siginfo.h>
   3#include<asm/compat_ucontext.h>
   4
   5#ifndef _ASM_PARISC_COMPAT_RT_SIGFRAME_H
   6#define _ASM_PARISC_COMPAT_RT_SIGFRAME_H
   7
   8/* In a deft move of uber-hackery, we decide to carry the top half of all
   9 * 64-bit registers in a non-portable, non-ABI, hidden structure.
  10 * Userspace can read the hidden structure if it *wants* but is never
  11 * guaranteed to be in the same place. Infact the uc_sigmask from the 
  12 * ucontext_t structure may push the hidden register file downards
  13 */
  14struct compat_regfile {
  15        /* Upper half of all the 64-bit registers that were truncated
  16           on a copy to a 32-bit userspace */
  17        compat_int_t rf_gr[32];
  18        compat_int_t rf_iasq[2];
  19        compat_int_t rf_iaoq[2];
  20        compat_int_t rf_sar;
  21};
  22
  23#define COMPAT_SIGRETURN_TRAMP 4
  24#define COMPAT_SIGRESTARTBLOCK_TRAMP 5 
  25#define COMPAT_TRAMP_SIZE (COMPAT_SIGRETURN_TRAMP + COMPAT_SIGRESTARTBLOCK_TRAMP)
  26
  27struct compat_rt_sigframe {
  28        /* XXX: Must match trampoline size in arch/parisc/kernel/signal.c 
  29                Secondary to that it must protect the ERESTART_RESTARTBLOCK
  30                trampoline we left on the stack (we were bad and didn't 
  31                change sp so we could run really fast.) */
  32        compat_uint_t tramp[COMPAT_TRAMP_SIZE];
  33        compat_siginfo_t info;
  34        struct compat_ucontext uc;
  35        /* Hidden location of truncated registers, *must* be last. */
  36        struct compat_regfile regs; 
  37};
  38
  39/*
  40 * The 32-bit ABI wants at least 48 bytes for a function call frame:
  41 * 16 bytes for arg0-arg3, and 32 bytes for magic (the only part of
  42 * which Linux/parisc uses is sp-20 for the saved return pointer...)
  43 * Then, the stack pointer must be rounded to a cache line (64 bytes).
  44 */
  45#define SIGFRAME32              64
  46#define FUNCTIONCALLFRAME32     48
  47#define PARISC_RT_SIGFRAME_SIZE32                                       \
  48        (((sizeof(struct compat_rt_sigframe) + FUNCTIONCALLFRAME32) + SIGFRAME32) & -SIGFRAME32)
  49
  50#endif
  51