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1da177e4 LT |
1 | #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 | */ | |
14 | struct 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 | ||
27 | struct 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 |