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        compat_uint_t pad[1];
47        struct compat_sigcontext uc_mcontext;
48        compat_sigset_t uc_sigmask;     /* mask last for extensibility */
49};
50
51/* ELF32 signal handling */
52
53struct k_sigaction32 {
54	struct compat_sigaction sa;
55};
56
57typedef struct compat_siginfo {
58        int si_signo;
59        int si_errno;
60        int si_code;
61
62        union {
63                int _pad[((128/sizeof(int)) - 3)];
64
65                /* kill() */
66                struct {
67                        unsigned int _pid;      /* sender's pid */
68                        unsigned int _uid;      /* sender's uid */
69                } _kill;
70
71                /* POSIX.1b timers */
72                struct {
73                        compat_timer_t _tid;            /* timer id */
74                        int _overrun;           /* overrun count */
75                        char _pad[sizeof(unsigned int) - sizeof(int)];
76                        compat_sigval_t _sigval;        /* same as below */
77                        int _sys_private;       /* not to be passed to user */
78                } _timer;
79
80                /* POSIX.1b signals */
81                struct {
82                        unsigned int _pid;      /* sender's pid */
83                        unsigned int _uid;      /* sender's uid */
84                        compat_sigval_t _sigval;
85                } _rt;
86
87                /* SIGCHLD */
88                struct {
89                        unsigned int _pid;      /* which child */
90                        unsigned int _uid;      /* sender's uid */
91                        int _status;            /* exit code */
92                        compat_clock_t _utime;
93                        compat_clock_t _stime;
94                } _sigchld;
95
96                /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
97                struct {
98                        unsigned int _addr;     /* faulting insn/memory ref. */
99                } _sigfault;
100
101                /* SIGPOLL */
102                struct {
103                        int _band;      /* POLL_IN, POLL_OUT, POLL_MSG */
104                        int _fd;
105                } _sigpoll;
106        } _sifields;
107} compat_siginfo_t;
108
109int copy_siginfo_to_user32 (compat_siginfo_t __user *to, siginfo_t *from);
110int copy_siginfo_from_user32 (siginfo_t *to, compat_siginfo_t __user *from);
111
112/* In a deft move of uber-hackery, we decide to carry the top half of all
113 * 64-bit registers in a non-portable, non-ABI, hidden structure.
114 * Userspace can read the hidden structure if it *wants* but is never
115 * guaranteed to be in the same place. In fact the uc_sigmask from the
116 * ucontext_t structure may push the hidden register file downards
117 */
118struct compat_regfile {
119        /* Upper half of all the 64-bit registers that were truncated
120           on a copy to a 32-bit userspace */
121        compat_int_t rf_gr[32];
122        compat_int_t rf_iasq[2];
123        compat_int_t rf_iaoq[2];
124        compat_int_t rf_sar;
125};
126
127#define COMPAT_SIGRETURN_TRAMP 4
128#define COMPAT_SIGRESTARTBLOCK_TRAMP 5
129#define COMPAT_TRAMP_SIZE (COMPAT_SIGRETURN_TRAMP + \
130				COMPAT_SIGRESTARTBLOCK_TRAMP)
131
132struct compat_rt_sigframe {
133        compat_uint_t tramp[COMPAT_TRAMP_SIZE];
134        compat_siginfo_t info;
135        struct compat_ucontext uc;
136        /* Hidden location of truncated registers, *must* be last. */
137        struct compat_regfile regs;
138};
139
140/*
141 * The 32-bit ABI wants at least 48 bytes for a function call frame:
142 * 16 bytes for arg0-arg3, and 32 bytes for magic (the only part of
143 * which Linux/parisc uses is sp-20 for the saved return pointer...)
144 * Then, the stack pointer must be rounded to a cache line (64 bytes).
145 */
146#define SIGFRAME32              64
147#define FUNCTIONCALLFRAME32     48
148#define PARISC_RT_SIGFRAME_SIZE32 (((sizeof(struct compat_rt_sigframe) + FUNCTIONCALLFRAME32) + SIGFRAME32) & -SIGFRAME32)
149
150void sigset_32to64(sigset_t *s64, compat_sigset_t *s32);
151void sigset_64to32(compat_sigset_t *s32, sigset_t *s64);
152int do_sigaltstack32 (const compat_stack_t __user *uss32,
153		compat_stack_t __user *uoss32, unsigned long sp);
154long restore_sigcontext32(struct compat_sigcontext __user *sc,
155		struct compat_regfile __user *rf,
156		struct pt_regs *regs);
157long setup_sigcontext32(struct compat_sigcontext __user *sc,
158		struct compat_regfile __user *rf,
159		struct pt_regs *regs, int in_syscall);
160
161#endif
162