arch/parisc/include/asm/compat_rt_sigframe.h

   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  */
  14 struct 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
  27 struct 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