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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 
25 
26 typedef struct compat_sigaltstack {
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 {
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 {
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 {
56 };
57 
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];
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.) */
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