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 typedef 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
 110 int copy_siginfo_to_user32 (compat_siginfo_t __user *to, siginfo_t *from);
 111 int 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  */
 119 struct 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
 133 struct 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
 155 void sigset_32to64(sigset_t *s64, compat_sigset_t *s32);
 156 void sigset_64to32(compat_sigset_t *s32, sigset_t *s64);
 157 int do_sigaltstack32 (const compat_stack_t __user *uss32,
 158                 compat_stack_t __user *uoss32, unsigned long sp);
 159 long restore_sigcontext32(struct compat_sigcontext __user *sc,
 160                 struct compat_regfile __user *rf,
 161                 struct pt_regs *regs);
 162 long setup_sigcontext32(struct compat_sigcontext __user *sc,
 163                 struct compat_regfile __user *rf,
 164                 struct pt_regs *regs, int in_syscall);
 165
 166 #endif