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 51