blob: 81bec28bdc4844c8429f6a917bc2e907b2b64b61 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001#include<linux/compat.h>
2#include<linux/compat_siginfo.h>
3#include<asm/compat_ucontext.h>
4
5#ifndef _ASM_PARISC_COMPAT_RT_SIGFRAME_H
6#define _ASM_PARISC_COMPAT_RT_SIGFRAME_H
7
8/* In a deft move of uber-hackery, we decide to carry the top half of all
9 * 64-bit registers in a non-portable, non-ABI, hidden structure.
10 * Userspace can read the hidden structure if it *wants* but is never
11 * guaranteed to be in the same place. Infact the uc_sigmask from the
12 * ucontext_t structure may push the hidden register file downards
13 */
14struct compat_regfile {
15 /* Upper half of all the 64-bit registers that were truncated
16 on a copy to a 32-bit userspace */
17 compat_int_t rf_gr[32];
18 compat_int_t rf_iasq[2];
19 compat_int_t rf_iaoq[2];
20 compat_int_t rf_sar;
21};
22
23#define COMPAT_SIGRETURN_TRAMP 4
24#define COMPAT_SIGRESTARTBLOCK_TRAMP 5
25#define COMPAT_TRAMP_SIZE (COMPAT_SIGRETURN_TRAMP + COMPAT_SIGRESTARTBLOCK_TRAMP)
26
27struct compat_rt_sigframe {
28 /* XXX: Must match trampoline size in arch/parisc/kernel/signal.c
29 Secondary to that it must protect the ERESTART_RESTARTBLOCK
30 trampoline we left on the stack (we were bad and didn't
31 change sp so we could run really fast.) */
32 compat_uint_t tramp[COMPAT_TRAMP_SIZE];
33 compat_siginfo_t info;
34 struct compat_ucontext uc;
35 /* Hidden location of truncated registers, *must* be last. */
36 struct compat_regfile regs;
37};
38
39/*
40 * The 32-bit ABI wants at least 48 bytes for a function call frame:
41 * 16 bytes for arg0-arg3, and 32 bytes for magic (the only part of
42 * which Linux/parisc uses is sp-20 for the saved return pointer...)
43 * Then, the stack pointer must be rounded to a cache line (64 bytes).
44 */
45#define SIGFRAME32 64
46#define FUNCTIONCALLFRAME32 48
47#define PARISC_RT_SIGFRAME_SIZE32 \
48 (((sizeof(struct compat_rt_sigframe) + FUNCTIONCALLFRAME32) + SIGFRAME32) & -SIGFRAME32)
49
50#endif