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authorBrian Gerst <brgerst@gmail.com>2009-02-10 09:51:46 -0500
committerIngo Molnar <mingo@elte.hu>2009-02-11 12:40:45 +0100
commit253f29a4ae9cc6cdc7b94f96517f27a93885a6ce (patch)
tree09942e565938a6bac216b1725ccf607e01d09b20 /arch/x86/kernel/process_32.c
parentaa78bcfa01dec3cdbde3cda098ce32abbd9c3bf6 (diff)
x86: pass in pt_regs pointer for syscalls that need it
Some syscalls need to access the pt_regs structure, either to copy user register state or to modifiy it. This patch adds stubs to load the address of the pt_regs struct into the %eax register, and changes the syscalls to regparm(1) to receive the pt_regs pointer as the first argument. Signed-off-by: Brian Gerst <brgerst@gmail.com> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/process_32.c')
-rw-r--r--arch/x86/kernel/process_32.c35
1 files changed, 14 insertions, 21 deletions
diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c
index b50604bb1e4..5a9dcfb01f7 100644
--- a/arch/x86/kernel/process_32.c
+++ b/arch/x86/kernel/process_32.c
@@ -603,24 +603,18 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
return prev_p;
}
-asmlinkage int sys_fork(struct pt_regs regs)
+ptregscall int sys_fork(struct pt_regs *regs)
{
- return do_fork(SIGCHLD, regs.sp, &regs, 0, NULL, NULL);
+ return do_fork(SIGCHLD, regs->sp, regs, 0, NULL, NULL);
}
-asmlinkage int sys_clone(struct pt_regs regs)
+ptregscall int sys_clone(struct pt_regs *regs, unsigned long clone_flags,
+ unsigned long newsp, int __user *parent_tidptr,
+ unsigned long unused, int __user *child_tidptr)
{
- unsigned long clone_flags;
- unsigned long newsp;
- int __user *parent_tidptr, *child_tidptr;
-
- clone_flags = regs.bx;
- newsp = regs.cx;
- parent_tidptr = (int __user *)regs.dx;
- child_tidptr = (int __user *)regs.di;
if (!newsp)
- newsp = regs.sp;
- return do_fork(clone_flags, newsp, &regs, 0, parent_tidptr, child_tidptr);
+ newsp = regs->sp;
+ return do_fork(clone_flags, newsp, regs, 0, parent_tidptr, child_tidptr);
}
/*
@@ -633,27 +627,26 @@ asmlinkage int sys_clone(struct pt_regs regs)
* do not have enough call-clobbered registers to hold all
* the information you need.
*/
-asmlinkage int sys_vfork(struct pt_regs regs)
+ptregscall int sys_vfork(struct pt_regs *regs)
{
- return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs.sp, &regs, 0, NULL, NULL);
+ return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->sp, regs, 0, NULL, NULL);
}
/*
* sys_execve() executes a new program.
*/
-asmlinkage int sys_execve(struct pt_regs regs)
+ptregscall int sys_execve(struct pt_regs *regs, char __user *u_filename,
+ char __user * __user *argv,
+ char __user * __user *envp)
{
int error;
char *filename;
- filename = getname((char __user *) regs.bx);
+ filename = getname(u_filename);
error = PTR_ERR(filename);
if (IS_ERR(filename))
goto out;
- error = do_execve(filename,
- (char __user * __user *) regs.cx,
- (char __user * __user *) regs.dx,
- &regs);
+ error = do_execve(filename, argv, envp, regs);
if (error == 0) {
/* Make sure we don't return using sysenter.. */
set_thread_flag(TIF_IRET);