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arch/tile: eliminate pt_regs trampolines for syscalls

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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 <cmetcalf@tilera.com>
This commit is contained in:
Chris Metcalf
2012-10-23 13:30:54 -04:00
committed by Al Viro
parent 530550651f
commit 6b14e4198c
10 changed files with 39 additions and 57 deletions
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19
arch/tile/include/asm/syscalls.h
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@@ -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 <asm-generic/syscalls.h>