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 typedef compat_uptr_t compat_sighandler_t;
  25
  26 typedef struct compat_sigaltstack {
  27         compat_uptr_t ss_sp;
  28         compat_int_t ss_flags;
  29         compat_size_t ss_size;
  30 } compat_stack_t;
  31
  32 /* Most things should be clean enough to redefine this at will, if care
  33    is taken to make libc match.  */
  34
  35 struct compat_sigaction {
  36         compat_sighandler_t sa_handler;
  37         compat_uint_t sa_flags;
  38         compat_sigset_t sa_mask;               /* mask last for extensibility */
  39 };
  40
  41 /* 32-bit ucontext as seen from an 64-bit kernel */
  42 struct compat_ucontext {
  43         compat_uint_t uc_flags;
  44         compat_uptr_t uc_link;
  45         compat_stack_t uc_stack;        /* struct compat_sigaltstack (12 bytes)*/
  46         /* FIXME: Pad out to get uc_mcontext to start at an 8-byte aligned boundary */
  47         compat_uint_t pad[1];
  48         struct compat_sigcontext uc_mcontext;
  49         compat_sigset_t uc_sigmask;     /* mask last for extensibility */
  50 };
  51
  52 /* ELF32 signal handling */
  53
  54 struct k_sigaction32 {
  55         struct compat_sigaction sa;
  56 };
  57
  58 int copy_siginfo_to_user32 (compat_siginfo_t __user *to, siginfo_t *from);
  59 int copy_siginfo_from_user32 (siginfo_t *to, compat_siginfo_t __user *from);
  60
  61 /* In a deft move of uber-hackery, we decide to carry the top half of all
  62  * 64-bit registers in a non-portable, non-ABI, hidden structure.
  63  * Userspace can read the hidden structure if it *wants* but is never
  64  * guaranteed to be in the same place. In fact the uc_sigmask from the
  65  * ucontext_t structure may push the hidden register file downards
  66  */
  67 struct compat_regfile {
  68         /* Upper half of all the 64-bit registers that were truncated
  69            on a copy to a 32-bit userspace */
  70         compat_int_t rf_gr[32];
  71         compat_int_t rf_iasq[2];
  72         compat_int_t rf_iaoq[2];
  73         compat_int_t rf_sar;
  74 };
  75
  76 #define COMPAT_SIGRETURN_TRAMP 4
  77 #define COMPAT_SIGRESTARTBLOCK_TRAMP 5
  78 #define COMPAT_TRAMP_SIZE (COMPAT_SIGRETURN_TRAMP + \
  79                                 COMPAT_SIGRESTARTBLOCK_TRAMP)
  80
  81 struct compat_rt_sigframe {
  82         /* XXX: Must match trampoline size in arch/parisc/kernel/signal.c
  83                 Secondary to that it must protect the ERESTART_RESTARTBLOCK
  84                 trampoline we left on the stack (we were bad and didn't
  85                 change sp so we could run really fast.) */
  86         compat_uint_t tramp[COMPAT_TRAMP_SIZE];
  87         compat_siginfo_t info;
  88         struct compat_ucontext uc;
  89         /* Hidden location of truncated registers, *must* be last. */
  90         struct compat_regfile regs;
  91 };
  92
  93 /*
  94  * The 32-bit ABI wants at least 48 bytes for a function call frame:
  95  * 16 bytes for arg0-arg3, and 32 bytes for magic (the only part of
  96  * which Linux/parisc uses is sp-20 for the saved return pointer...)
  97  * Then, the stack pointer must be rounded to a cache line (64 bytes).
  98  */
  99 #define SIGFRAME32              64
 100 #define FUNCTIONCALLFRAME32     48
 101 #define PARISC_RT_SIGFRAME_SIZE32 (((sizeof(struct compat_rt_sigframe) + FUNCTIONCALLFRAME32) + SIGFRAME32) & -SIGFRAME32)
 102
 103 void sigset_32to64(sigset_t *s64, compat_sigset_t *s32);
 104 void sigset_64to32(compat_sigset_t *s32, sigset_t *s64);
 105 int do_sigaltstack32 (const compat_stack_t __user *uss32,
 106                 compat_stack_t __user *uoss32, unsigned long sp);
 107 long restore_sigcontext32(struct compat_sigcontext __user *sc,
 108                 struct compat_regfile __user *rf,
 109                 struct pt_regs *regs);
 110 long setup_sigcontext32(struct compat_sigcontext __user *sc,
 111                 struct compat_regfile __user *rf,
 112                 struct pt_regs *regs, int in_syscall);
 113
 114 #endif