linux/arch/parisc/kernel/signal32.h
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   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
  24typedef compat_uptr_t compat_sighandler_t;
  25
  26typedef 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
  35struct 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 */
  42struct 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
  54struct k_sigaction32 {
  55        struct compat_sigaction sa;
  56};
  57
  58typedef struct compat_siginfo {
  59        int si_signo;
  60        int si_errno;
  61        int si_code;
  62
  63        union {
  64                int _pad[((128/sizeof(int)) - 3)];
  65
  66                /* kill() */
  67                struct {
  68                        unsigned int _pid;      /* sender's pid */
  69                        unsigned int _uid;      /* sender's uid */
  70                } _kill;
  71
  72                /* POSIX.1b timers */
  73                struct {
  74                        compat_timer_t _tid;            /* timer id */
  75                        int _overrun;           /* overrun count */
  76                        char _pad[sizeof(unsigned int) - sizeof(int)];
  77                        compat_sigval_t _sigval;        /* same as below */
  78                        int _sys_private;       /* not to be passed to user */
  79                } _timer;
  80
  81                /* POSIX.1b signals */
  82                struct {
  83                        unsigned int _pid;      /* sender's pid */
  84                        unsigned int _uid;      /* sender's uid */
  85                        compat_sigval_t _sigval;
  86                } _rt;
  87
  88                /* SIGCHLD */
  89                struct {
  90                        unsigned int _pid;      /* which child */
  91                        unsigned int _uid;      /* sender's uid */
  92                        int _status;            /* exit code */
  93                        compat_clock_t _utime;
  94                        compat_clock_t _stime;
  95                } _sigchld;
  96
  97                /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
  98                struct {
  99                        unsigned int _addr;     /* faulting insn/memory ref. */
 100                } _sigfault;
 101
 102                /* SIGPOLL */
 103                struct {
 104                        int _band;      /* POLL_IN, POLL_OUT, POLL_MSG */
 105                        int _fd;
 106                } _sigpoll;
 107        } _sifields;
 108} compat_siginfo_t;
 109
 110int copy_siginfo_to_user32 (compat_siginfo_t __user *to, siginfo_t *from);
 111int copy_siginfo_from_user32 (siginfo_t *to, compat_siginfo_t __user *from);
 112
 113/* In a deft move of uber-hackery, we decide to carry the top half of all
 114 * 64-bit registers in a non-portable, non-ABI, hidden structure.
 115 * Userspace can read the hidden structure if it *wants* but is never
 116 * guaranteed to be in the same place. In fact the uc_sigmask from the
 117 * ucontext_t structure may push the hidden register file downards
 118 */
 119struct compat_regfile {
 120        /* Upper half of all the 64-bit registers that were truncated
 121           on a copy to a 32-bit userspace */
 122        compat_int_t rf_gr[32];
 123        compat_int_t rf_iasq[2];
 124        compat_int_t rf_iaoq[2];
 125        compat_int_t rf_sar;
 126};
 127
 128#define COMPAT_SIGRETURN_TRAMP 4
 129#define COMPAT_SIGRESTARTBLOCK_TRAMP 5
 130#define COMPAT_TRAMP_SIZE (COMPAT_SIGRETURN_TRAMP + \
 131                                COMPAT_SIGRESTARTBLOCK_TRAMP)
 132
 133struct compat_rt_sigframe {
 134        /* XXX: Must match trampoline size in arch/parisc/kernel/signal.c
 135                Secondary to that it must protect the ERESTART_RESTARTBLOCK
 136                trampoline we left on the stack (we were bad and didn't
 137                change sp so we could run really fast.) */
 138        compat_uint_t tramp[COMPAT_TRAMP_SIZE];
 139        compat_siginfo_t info;
 140        struct compat_ucontext uc;
 141        /* Hidden location of truncated registers, *must* be last. */
 142        struct compat_regfile regs;
 143};
 144
 145/*
 146 * The 32-bit ABI wants at least 48 bytes for a function call frame:
 147 * 16 bytes for arg0-arg3, and 32 bytes for magic (the only part of
 148 * which Linux/parisc uses is sp-20 for the saved return pointer...)
 149 * Then, the stack pointer must be rounded to a cache line (64 bytes).
 150 */
 151#define SIGFRAME32              64
 152#define FUNCTIONCALLFRAME32     48
 153#define PARISC_RT_SIGFRAME_SIZE32 (((sizeof(struct compat_rt_sigframe) + FUNCTIONCALLFRAME32) + SIGFRAME32) & -SIGFRAME32)
 154
 155void sigset_32to64(sigset_t *s64, compat_sigset_t *s32);
 156void sigset_64to32(compat_sigset_t *s32, sigset_t *s64);
 157int do_sigaltstack32 (const compat_stack_t __user *uss32, 
 158                compat_stack_t __user *uoss32, unsigned long sp);
 159long restore_sigcontext32(struct compat_sigcontext __user *sc, 
 160                struct compat_regfile __user *rf,
 161                struct pt_regs *regs);
 162long setup_sigcontext32(struct compat_sigcontext __user *sc, 
 163                struct compat_regfile __user *rf,
 164                struct pt_regs *regs, int in_syscall);
 165
 166#endif
 167