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[S390] System call cleanup.

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Remove system call glue for sys_clone, sys_fork, sys_vfork, sys_execve,
sys_sigreturn, sys_rt_sigreturn and sys_sigaltstack. Call do_execve from
kernel_execve directly, move pt_regs to the right place and branch to
sysc_return to start the user space program. This removes the last
in-kernel system call.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
This commit is contained in:
Martin Schwidefsky
2007-04-27 16:01:40 +02:00
parent ef99516c96
commit 03ff9a235a
8 changed files with 161 additions and 224 deletions
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80
arch/s390/kernel/process.c
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@@ -280,24 +280,26 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long new_stackp,
return 0;
}
asmlinkage long sys_fork(struct pt_regs regs)
asmlinkage long sys_fork(void)
{
return do_fork(SIGCHLD, regs.gprs[15], &regs, 0, NULL, NULL);
struct pt_regs *regs = task_pt_regs(current);
return do_fork(SIGCHLD, regs->gprs[15], regs, 0, NULL, NULL);
}
asmlinkage long sys_clone(struct pt_regs regs)
asmlinkage long sys_clone(void)
{
unsigned long clone_flags;
unsigned long newsp;
struct pt_regs *regs = task_pt_regs(current);
unsigned long clone_flags;
unsigned long newsp;
int __user *parent_tidptr, *child_tidptr;
clone_flags = regs.gprs[3];
newsp = regs.orig_gpr2;
parent_tidptr = (int __user *) regs.gprs[4];
child_tidptr = (int __user *) regs.gprs[5];
if (!newsp)
newsp = regs.gprs[15];
return do_fork(clone_flags, newsp, &regs, 0,
clone_flags = regs->gprs[3];
newsp = regs->orig_gpr2;
parent_tidptr = (int __user *) regs->gprs[4];
child_tidptr = (int __user *) regs->gprs[5];
if (!newsp)
newsp = regs->gprs[15];
return do_fork(clone_flags, newsp, regs, 0,
parent_tidptr, child_tidptr);
}
@@ -311,40 +313,52 @@ asmlinkage long sys_clone(struct pt_regs regs)
* do not have enough call-clobbered registers to hold all
* the information you need.
*/
asmlinkage long sys_vfork(struct pt_regs regs)
asmlinkage long sys_vfork(void)
{
struct pt_regs *regs = task_pt_regs(current);
return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD,
regs.gprs[15], &regs, 0, NULL, NULL);
regs->gprs[15], regs, 0, NULL, NULL);
}
asmlinkage void execve_tail(void)
{
task_lock(current);
current->ptrace &= ~PT_DTRACE;
task_unlock(current);
current->thread.fp_regs.fpc = 0;
if (MACHINE_HAS_IEEE)
asm volatile("sfpc %0,%0" : : "d" (0));
}
/*
* sys_execve() executes a new program.
*/
asmlinkage long sys_execve(struct pt_regs regs)
asmlinkage long sys_execve(void)
{
int error;
char * filename;
struct pt_regs *regs = task_pt_regs(current);
char *filename;
unsigned long result;
int rc;
filename = getname((char __user *) regs.orig_gpr2);
error = PTR_ERR(filename);
if (IS_ERR(filename))
goto out;
error = do_execve(filename, (char __user * __user *) regs.gprs[3],
(char __user * __user *) regs.gprs[4], &regs);
if (error == 0) {
task_lock(current);
current->ptrace &= ~PT_DTRACE;
task_unlock(current);
current->thread.fp_regs.fpc = 0;
if (MACHINE_HAS_IEEE)
asm volatile("sfpc %0,%0" : : "d" (0));
filename = getname((char __user *) regs->orig_gpr2);
if (IS_ERR(filename)) {
result = PTR_ERR(filename);
goto out;
}
putname(filename);
rc = do_execve(filename, (char __user * __user *) regs->gprs[3],
(char __user * __user *) regs->gprs[4], regs);
if (rc) {
result = rc;
goto out_putname;
}
execve_tail();
result = regs->gprs[2];
out_putname:
putname(filename);
out:
return error;
return result;
}
/*
* fill in the FPU structure for a core dump.
*/