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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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20
arch/s390/kernel/sys_s390.c
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@@ -266,23 +266,3 @@ s390_fadvise64_64(struct fadvise64_64_args __user *args)
return -EFAULT;
return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
}
/*
* Do a system call from kernel instead of calling sys_execve so we
* end up with proper pt_regs.
*/
int kernel_execve(const char *filename, char *const argv[], char *const envp[])
{
register const char *__arg1 asm("2") = filename;
register char *const*__arg2 asm("3") = argv;
register char *const*__arg3 asm("4") = envp;
register long __svcres asm("2");
asm volatile(
"svc %b1"
: "=d" (__svcres)
: "i" (__NR_execve),
"0" (__arg1),
"d" (__arg2),
"d" (__arg3) : "memory");
return __svcres;
}