From 6b14e4198c729b748a7f6d22059e6a101d2b241a Mon Sep 17 00:00:00 2001 From: Chris Metcalf Date: Tue, 23 Oct 2012 13:30:54 -0400 Subject: arch/tile: eliminate pt_regs trampolines for syscalls Using the new current_pt_regs() model, we can remove some trampolines from assembly code and call directly to the C syscall implementations. rt_sigreturn() and clone() still need some assembly wrapping, but no longer are passed a pt_regs pointer. sigaltstack() and the tilepro-specific cmpxchg_badaddr() syscalls are now just straight C. Signed-off-by: Chris Metcalf --- arch/tile/include/asm/compat.h | 9 +++------ arch/tile/include/asm/syscalls.h | 19 +++++++++++++------ 2 files changed, 16 insertions(+), 12 deletions(-) (limited to 'arch/tile/include') diff --git a/arch/tile/include/asm/compat.h b/arch/tile/include/asm/compat.h index 3bcf1b9..ca61fb4 100644 --- a/arch/tile/include/asm/compat.h +++ b/arch/tile/include/asm/compat.h @@ -280,10 +280,9 @@ long compat_sys_rt_sigaction(int sig, struct compat_sigaction __user *act, size_t sigsetsize); long compat_sys_rt_sigqueueinfo(int pid, int sig, struct compat_siginfo __user *uinfo); -long compat_sys_rt_sigreturn(struct pt_regs *); +long compat_sys_rt_sigreturn(void); long compat_sys_sigaltstack(const struct compat_sigaltstack __user *uss_ptr, - struct compat_sigaltstack __user *uoss_ptr, - struct pt_regs *); + struct compat_sigaltstack __user *uoss_ptr); long compat_sys_truncate64(char __user *filename, u32 dummy, u32 low, u32 high); long compat_sys_ftruncate64(unsigned int fd, u32 dummy, u32 low, u32 high); long compat_sys_pread64(unsigned int fd, char __user *ubuf, size_t count, @@ -300,9 +299,7 @@ long compat_sys_fallocate(int fd, int mode, long compat_sys_sched_rr_get_interval(compat_pid_t pid, struct compat_timespec __user *interval); -/* These are the intvec_64.S trampolines. */ -long _compat_sys_sigaltstack(const struct compat_sigaltstack __user *uss_ptr, - struct compat_sigaltstack __user *uoss_ptr); +/* Assembly trampoline to avoid clobbering r0. */ long _compat_sys_rt_sigreturn(void); #endif /* _ASM_TILE_COMPAT_H */ diff --git a/arch/tile/include/asm/syscalls.h b/arch/tile/include/asm/syscalls.h index 0d52992..369696d 100644 --- a/arch/tile/include/asm/syscalls.h +++ b/arch/tile/include/asm/syscalls.h @@ -51,8 +51,7 @@ long sys_cacheflush(unsigned long addr, unsigned long len, #ifndef __tilegx__ /* mm/fault.c */ -long sys_cmpxchg_badaddr(unsigned long address, struct pt_regs *); -long _sys_cmpxchg_badaddr(unsigned long address); +long sys_cmpxchg_badaddr(unsigned long address); #endif #ifdef CONFIG_COMPAT @@ -63,15 +62,23 @@ long sys_truncate64(const char __user *path, loff_t length); long sys_ftruncate64(unsigned int fd, loff_t length); #endif -/* These are the intvec*.S trampolines. */ -long _sys_sigaltstack(const stack_t __user *, stack_t __user *); -long _sys_rt_sigreturn(void); -long _sys_clone(unsigned long clone_flags, unsigned long newsp, +/* Provide versions of standard syscalls that use current_pt_regs(). */ +long sys_clone(unsigned long clone_flags, unsigned long newsp, void __user *parent_tid, void __user *child_tid); long sys_execve(const char __user *filename, const char __user *const __user *argv, const char __user *const __user *envp); +long sys_rt_sigreturn(void); +long sys_sigaltstack(const stack_t __user *, stack_t __user *); +#define sys_clone sys_clone #define sys_execve sys_execve +#define sys_rt_sigreturn sys_rt_sigreturn +#define sys_sigaltstack sys_sigaltstack + +/* These are the intvec*.S trampolines. */ +long _sys_rt_sigreturn(void); +long _sys_clone(unsigned long clone_flags, unsigned long newsp, + void __user *parent_tid, void __user *child_tid); #include -- cgit v1.1