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/* 32-bit ucontext as seen from an 64-bit kernel */
25struct compat_ucontext {
26        compat_uint_t uc_flags;
27        compat_uptr_t uc_link;
28        compat_stack_t uc_stack;        /* struct compat_sigaltstack (12 bytes)*/
29        /* FIXME: Pad out to get uc_mcontext to start at an 8-byte aligned boundary */
30        compat_uint_t pad[1];
31        struct compat_sigcontext uc_mcontext;
32        compat_sigset_t uc_sigmask;     /* mask last for extensibility */
33};
34
35/* ELF32 signal handling */
36
37int copy_siginfo_to_user32 (compat_siginfo_t __user *to, const siginfo_t *from);
38int copy_siginfo_from_user32 (siginfo_t *to, compat_siginfo_t __user *from);
39
40/* In a deft move of uber-hackery, we decide to carry the top half of all
41 * 64-bit registers in a non-portable, non-ABI, hidden structure.
42 * Userspace can read the hidden structure if it *wants* but is never
43 * guaranteed to be in the same place. In fact the uc_sigmask from the
44 * ucontext_t structure may push the hidden register file downards
45 */
46struct compat_regfile {
47        /* Upper half of all the 64-bit registers that were truncated
48           on a copy to a 32-bit userspace */
49        compat_int_t rf_gr[32];
50        compat_int_t rf_iasq[2];
51        compat_int_t rf_iaoq[2];
52        compat_int_t rf_sar;
53};
54
55#define COMPAT_SIGRETURN_TRAMP 4
56#define COMPAT_SIGRESTARTBLOCK_TRAMP 5
57#define COMPAT_TRAMP_SIZE (COMPAT_SIGRETURN_TRAMP + \
58				COMPAT_SIGRESTARTBLOCK_TRAMP)
59
60struct compat_rt_sigframe {
61        /* XXX: Must match trampoline size in arch/parisc/kernel/signal.c
62                Secondary to that it must protect the ERESTART_RESTARTBLOCK
63                trampoline we left on the stack (we were bad and didn't
64                change sp so we could run really fast.) */
65        compat_uint_t tramp[COMPAT_TRAMP_SIZE];
66        compat_siginfo_t info;
67        struct compat_ucontext uc;
68        /* Hidden location of truncated registers, *must* be last. */
69        struct compat_regfile regs;
70};
71
72/*
73 * The 32-bit ABI wants at least 48 bytes for a function call frame:
74 * 16 bytes for arg0-arg3, and 32 bytes for magic (the only part of
75 * which Linux/parisc uses is sp-20 for the saved return pointer...)
76 * Then, the stack pointer must be rounded to a cache line (64 bytes).
77 */
78#define SIGFRAME32              64
79#define FUNCTIONCALLFRAME32     48
80#define PARISC_RT_SIGFRAME_SIZE32 (((sizeof(struct compat_rt_sigframe) + FUNCTIONCALLFRAME32) + SIGFRAME32) & -SIGFRAME32)
81
82void sigset_32to64(sigset_t *s64, compat_sigset_t *s32);
83void sigset_64to32(compat_sigset_t *s32, sigset_t *s64);
84long restore_sigcontext32(struct compat_sigcontext __user *sc,
85		struct compat_regfile __user *rf,
86		struct pt_regs *regs);
87long setup_sigcontext32(struct compat_sigcontext __user *sc,
88		struct compat_regfile __user *rf,
89		struct pt_regs *regs, int in_syscall);
90
91#endif
92