diff options
author | Kyle McMartin <kyle@mcmartin.ca> | 2008-07-28 23:02:13 -0400 |
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committer | Kyle McMartin <kyle@hera.kernel.org> | 2008-10-10 16:32:29 +0000 |
commit | deae26bf6a10e47983606f5df080b91e97650ead (patch) | |
tree | 84a8a68145d0f713d7c5a1f9e6b3b03be9b3a4c8 /arch/parisc/include/asm/compat_rt_sigframe.h | |
parent | 6c86cb8237bf08443806089130dc108051569a93 (diff) |
parisc: move include/asm-parisc to arch/parisc/include/asm
Diffstat (limited to 'arch/parisc/include/asm/compat_rt_sigframe.h')
-rw-r--r-- | arch/parisc/include/asm/compat_rt_sigframe.h | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/arch/parisc/include/asm/compat_rt_sigframe.h b/arch/parisc/include/asm/compat_rt_sigframe.h new file mode 100644 index 000000000000..81bec28bdc48 --- /dev/null +++ b/arch/parisc/include/asm/compat_rt_sigframe.h @@ -0,0 +1,50 @@ +#include<linux/compat.h> +#include<linux/compat_siginfo.h> +#include<asm/compat_ucontext.h> + +#ifndef _ASM_PARISC_COMPAT_RT_SIGFRAME_H +#define _ASM_PARISC_COMPAT_RT_SIGFRAME_H + +/* In a deft move of uber-hackery, we decide to carry the top half of all + * 64-bit registers in a non-portable, non-ABI, hidden structure. + * Userspace can read the hidden structure if it *wants* but is never + * guaranteed to be in the same place. Infact the uc_sigmask from the + * ucontext_t structure may push the hidden register file downards + */ +struct compat_regfile { + /* Upper half of all the 64-bit registers that were truncated + on a copy to a 32-bit userspace */ + compat_int_t rf_gr[32]; + compat_int_t rf_iasq[2]; + compat_int_t rf_iaoq[2]; + compat_int_t rf_sar; +}; + +#define COMPAT_SIGRETURN_TRAMP 4 +#define COMPAT_SIGRESTARTBLOCK_TRAMP 5 +#define COMPAT_TRAMP_SIZE (COMPAT_SIGRETURN_TRAMP + COMPAT_SIGRESTARTBLOCK_TRAMP) + +struct compat_rt_sigframe { + /* XXX: Must match trampoline size in arch/parisc/kernel/signal.c + Secondary to that it must protect the ERESTART_RESTARTBLOCK + trampoline we left on the stack (we were bad and didn't + change sp so we could run really fast.) */ + compat_uint_t tramp[COMPAT_TRAMP_SIZE]; + compat_siginfo_t info; + struct compat_ucontext uc; + /* Hidden location of truncated registers, *must* be last. */ + struct compat_regfile regs; +}; + +/* + * The 32-bit ABI wants at least 48 bytes for a function call frame: + * 16 bytes for arg0-arg3, and 32 bytes for magic (the only part of + * which Linux/parisc uses is sp-20 for the saved return pointer...) + * Then, the stack pointer must be rounded to a cache line (64 bytes). + */ +#define SIGFRAME32 64 +#define FUNCTIONCALLFRAME32 48 +#define PARISC_RT_SIGFRAME_SIZE32 \ + (((sizeof(struct compat_rt_sigframe) + FUNCTIONCALLFRAME32) + SIGFRAME32) & -SIGFRAME32) + +#endif |