1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3 * Copyright (C) 2001 Matthew Wilcox <willy at parisc-linux.org>
4 * Copyright (C) 2003 Carlos O'Donell <carlos at parisc-linux.org>
5 */
6 #ifndef _PARISC64_KERNEL_SIGNAL32_H
7 #define _PARISC64_KERNEL_SIGNAL32_H
8
9 #include <linux/compat.h>
10
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 };
21
22 /* ELF32 signal handling */
23
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
27 * guaranteed to be in the same place. In fact the uc_sigmask from the
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 struct compat_rt_sigframe {
40 unsigned int tramp[2]; /* holds original return address */
41 compat_siginfo_t info;
42 struct compat_ucontext uc;
43 /* Hidden location of truncated registers, *must* be last. */
44 struct compat_regfile regs;
45 };
46
47 /*
48 * The 32-bit ABI wants at least 48 bytes for a function call frame:
49 * 16 bytes for arg0-arg3, and 32 bytes for magic (the only part of
50 * which Linux/parisc uses is sp-20 for the saved return pointer...)
51 * Then, the stack pointer must be rounded to a cache line (64 bytes).
52 */
53 #define SIGFRAME32 64
54 #define FUNCTIONCALLFRAME32 48
55 #define PARISC_RT_SIGFRAME_SIZE32 (((sizeof(struct compat_rt_sigframe) + FUNCTIONCALLFRAME32) + SIGFRAME32) & -SIGFRAME32)
56
57 long restore_sigcontext32(struct compat_sigcontext __user *sc,
58 struct compat_regfile __user *rf,
59 struct pt_regs *regs);
60 long setup_sigcontext32(struct compat_sigcontext __user *sc,
61 struct compat_regfile __user *rf,
62 struct pt_regs *regs, int in_syscall);
63
64 #endif
65
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