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1a59d1b8 | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
1da177e4 LT |
2 | /* |
3 | * Copyright (C) 2001 Matthew Wilcox <willy at parisc-linux.org> | |
4 | * Copyright (C) 2003 Carlos O'Donell <carlos at parisc-linux.org> | |
1da177e4 LT |
5 | */ |
6 | #ifndef _PARISC64_KERNEL_SIGNAL32_H | |
7 | #define _PARISC64_KERNEL_SIGNAL32_H | |
8 | ||
9 | #include <linux/compat.h> | |
f671c45d | 10 | |
f671c45d KM |
11 | /* 32-bit ucontext as seen from an 64-bit kernel */ |
12 | struct compat_ucontext { | |
13 | compat_uint_t uc_flags; | |
14 | compat_uptr_t uc_link; | |
15 | compat_stack_t uc_stack; /* struct compat_sigaltstack (12 bytes)*/ | |
16 | /* FIXME: Pad out to get uc_mcontext to start at an 8-byte aligned boundary */ | |
17 | compat_uint_t pad[1]; | |
18 | struct compat_sigcontext uc_mcontext; | |
19 | compat_sigset_t uc_sigmask; /* mask last for extensibility */ | |
20 | }; | |
1da177e4 LT |
21 | |
22 | /* ELF32 signal handling */ | |
23 | ||
f671c45d KM |
24 | /* In a deft move of uber-hackery, we decide to carry the top half of all |
25 | * 64-bit registers in a non-portable, non-ABI, hidden structure. | |
26 | * Userspace can read the hidden structure if it *wants* but is never | |
7022672e | 27 | * guaranteed to be in the same place. In fact the uc_sigmask from the |
f671c45d KM |
28 | * ucontext_t structure may push the hidden register file downards |
29 | */ | |
30 | struct compat_regfile { | |
31 | /* Upper half of all the 64-bit registers that were truncated | |
32 | on a copy to a 32-bit userspace */ | |
33 | compat_int_t rf_gr[32]; | |
34 | compat_int_t rf_iasq[2]; | |
35 | compat_int_t rf_iaoq[2]; | |
36 | compat_int_t rf_sar; | |
37 | }; | |
38 | ||
39 | #define COMPAT_SIGRETURN_TRAMP 4 | |
40 | #define COMPAT_SIGRESTARTBLOCK_TRAMP 5 | |
41 | #define COMPAT_TRAMP_SIZE (COMPAT_SIGRETURN_TRAMP + \ | |
42 | COMPAT_SIGRESTARTBLOCK_TRAMP) | |
43 | ||
44 | struct compat_rt_sigframe { | |
45 | /* XXX: Must match trampoline size in arch/parisc/kernel/signal.c | |
46 | Secondary to that it must protect the ERESTART_RESTARTBLOCK | |
47 | trampoline we left on the stack (we were bad and didn't | |
48 | change sp so we could run really fast.) */ | |
49 | compat_uint_t tramp[COMPAT_TRAMP_SIZE]; | |
50 | compat_siginfo_t info; | |
51 | struct compat_ucontext uc; | |
52 | /* Hidden location of truncated registers, *must* be last. */ | |
53 | struct compat_regfile regs; | |
54 | }; | |
55 | ||
56 | /* | |
57 | * The 32-bit ABI wants at least 48 bytes for a function call frame: | |
58 | * 16 bytes for arg0-arg3, and 32 bytes for magic (the only part of | |
59 | * which Linux/parisc uses is sp-20 for the saved return pointer...) | |
60 | * Then, the stack pointer must be rounded to a cache line (64 bytes). | |
61 | */ | |
62 | #define SIGFRAME32 64 | |
63 | #define FUNCTIONCALLFRAME32 48 | |
64 | #define PARISC_RT_SIGFRAME_SIZE32 (((sizeof(struct compat_rt_sigframe) + FUNCTIONCALLFRAME32) + SIGFRAME32) & -SIGFRAME32) | |
65 | ||
1da177e4 LT |
66 | long restore_sigcontext32(struct compat_sigcontext __user *sc, |
67 | struct compat_regfile __user *rf, | |
68 | struct pt_regs *regs); | |
69 | long setup_sigcontext32(struct compat_sigcontext __user *sc, | |
70 | struct compat_regfile __user *rf, | |
71 | struct pt_regs *regs, int in_syscall); | |
72 | ||
73 | #endif |