arch/parisc/kernel/signal32.h

   1 /*
   2  *    Copyright (C) 2001 Matthew Wilcox <willy at parisc-linux.org>
   3  *    Copyright (C) 2003 Carlos O'Donell <carlos at parisc-linux.org>
   4  *
   5  *    This program is free software; you can redistribute it and/or modify
   6  *    it under the terms of the GNU General Public License as published by
   7  *    the Free Software Foundation; either version 2 of the License, or
   8  *    (at your option) any later version.
   9  *
  10  *    This program is distributed in the hope that it will be useful,
  11  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *    GNU General Public License for more details.
  14  *
  15  *    You should have received a copy of the GNU General Public License
  16  *    along with this program; if not, write to the Free Software
  17  *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  */
  19 #ifndef _PARISC64_KERNEL_SIGNAL32_H
  20 #define _PARISC64_KERNEL_SIGNAL32_H
  21
  22 #include <linux/compat.h>
  23
  24 /* 32-bit ucontext as seen from an 64-bit kernel */
  25 struct compat_ucontext {
  26         compat_uint_t uc_flags;
  27         compat_uptr_t uc_link;
  28         compat_stack_t uc_stack;        /* struct compat_sigaltstack (12 bytes)*/
  29         /* FIXME: Pad out to get uc_mcontext to start at an 8-byte aligned boundary */
  30         compat_uint_t pad[1];
  31         struct compat_sigcontext uc_mcontext;
  32         compat_sigset_t uc_sigmask;     /* mask last for extensibility */
  33 };
  34
  35 /* ELF32 signal handling */
  36
  37 /* In a deft move of uber-hackery, we decide to carry the top half of all
  38  * 64-bit registers in a non-portable, non-ABI, hidden structure.
  39  * Userspace can read the hidden structure if it *wants* but is never
  40  * guaranteed to be in the same place. In fact the uc_sigmask from the
  41  * ucontext_t structure may push the hidden register file downards
  42  */
  43 struct compat_regfile {
  44         /* Upper half of all the 64-bit registers that were truncated
  45            on a copy to a 32-bit userspace */
  46         compat_int_t rf_gr[32];
  47         compat_int_t rf_iasq[2];
  48         compat_int_t rf_iaoq[2];
  49         compat_int_t rf_sar;
  50 };
  51
  52 #define COMPAT_SIGRETURN_TRAMP 4
  53 #define COMPAT_SIGRESTARTBLOCK_TRAMP 5
  54 #define COMPAT_TRAMP_SIZE (COMPAT_SIGRETURN_TRAMP + \
  55                                 COMPAT_SIGRESTARTBLOCK_TRAMP)
  56
  57 struct compat_rt_sigframe {
  58         /* XXX: Must match trampoline size in arch/parisc/kernel/signal.c
  59                 Secondary to that it must protect the ERESTART_RESTARTBLOCK
  60                 trampoline we left on the stack (we were bad and didn't
  61                 change sp so we could run really fast.) */
  62         compat_uint_t tramp[COMPAT_TRAMP_SIZE];
  63         compat_siginfo_t info;
  64         struct compat_ucontext uc;
  65         /* Hidden location of truncated registers, *must* be last. */
  66         struct compat_regfile regs;
  67 };
  68
  69 /*
  70  * The 32-bit ABI wants at least 48 bytes for a function call frame:
  71  * 16 bytes for arg0-arg3, and 32 bytes for magic (the only part of
  72  * which Linux/parisc uses is sp-20 for the saved return pointer...)
  73  * Then, the stack pointer must be rounded to a cache line (64 bytes).
  74  */
  75 #define SIGFRAME32              64
  76 #define FUNCTIONCALLFRAME32     48
  77 #define PARISC_RT_SIGFRAME_SIZE32 (((sizeof(struct compat_rt_sigframe) + FUNCTIONCALLFRAME32) + SIGFRAME32) & -SIGFRAME32)
  78
  79 long restore_sigcontext32(struct compat_sigcontext __user *sc,
  80                 struct compat_regfile __user *rf,
  81                 struct pt_regs *regs);
  82 long setup_sigcontext32(struct compat_sigcontext __user *sc,
  83                 struct compat_regfile __user *rf,
  84                 struct pt_regs *regs, int in_syscall);
  85
  86 #endif