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/arch/parisc/kernel/signal32.h

https://github.com/aicjofs/android_kernel_lge_v500_20d
C Header | 166 lines | 95 code | 23 blank | 48 comment | 0 complexity | 6f0ba6bb5093367872df8d61d83232fc MD5 | raw file
  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