summaryrefslogtreecommitdiff
path: root/arch/s390/kernel/process.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/s390/kernel/process.c')
-rw-r--r--arch/s390/kernel/process.c30
1 files changed, 23 insertions, 7 deletions
diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
index bc3ca54edfb4..367bd000f6d1 100644
--- a/arch/s390/kernel/process.c
+++ b/arch/s390/kernel/process.c
@@ -29,6 +29,7 @@
#include <linux/random.h>
#include <linux/export.h>
#include <linux/init_task.h>
+#include <linux/entry-common.h>
#include <asm/cpu_mf.h>
#include <asm/io.h>
#include <asm/processor.h>
@@ -43,9 +44,22 @@
#include <asm/unwind.h>
#include "entry.h"
-asmlinkage void ret_from_fork(void) asm ("ret_from_fork");
+void ret_from_fork(void) asm("ret_from_fork");
-extern void kernel_thread_starter(void);
+void __ret_from_fork(struct task_struct *prev, struct pt_regs *regs)
+{
+ void (*func)(void *arg);
+
+ schedule_tail(prev);
+
+ if (!user_mode(regs)) {
+ /* Kernel thread */
+ func = (void *)regs->gprs[9];
+ func((void *)regs->gprs[10]);
+ }
+ clear_pt_regs_flag(regs, PIF_SYSCALL);
+ syscall_exit_to_user_mode(regs);
+}
void flush_thread(void)
{
@@ -108,10 +122,12 @@ int copy_thread(unsigned long clone_flags, unsigned long new_stackp,
p->thread.last_break = 1;
frame->sf.back_chain = 0;
+ frame->sf.gprs[5] = (unsigned long)frame + sizeof(struct stack_frame);
+ frame->sf.gprs[6] = (unsigned long)p;
/* new return point is ret_from_fork */
- frame->sf.gprs[8] = (unsigned long) ret_from_fork;
+ frame->sf.gprs[8] = (unsigned long)ret_from_fork;
/* fake return stack for resume(), don't go back to schedule */
- frame->sf.gprs[9] = (unsigned long) frame;
+ frame->sf.gprs[9] = (unsigned long)frame;
/* Store access registers to kernel stack of new process. */
if (unlikely(p->flags & PF_KTHREAD)) {
@@ -120,10 +136,10 @@ int copy_thread(unsigned long clone_flags, unsigned long new_stackp,
frame->childregs.psw.mask = PSW_KERNEL_BITS | PSW_MASK_DAT |
PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
frame->childregs.psw.addr =
- (unsigned long) kernel_thread_starter;
+ (unsigned long)__ret_from_fork;
frame->childregs.gprs[9] = new_stackp; /* function */
frame->childregs.gprs[10] = arg;
- frame->childregs.gprs[11] = (unsigned long) do_exit;
+ frame->childregs.gprs[11] = (unsigned long)do_exit;
frame->childregs.orig_gpr2 = -1;
return 0;
@@ -153,7 +169,7 @@ int copy_thread(unsigned long clone_flags, unsigned long new_stackp,
return 0;
}
-asmlinkage void execve_tail(void)
+void execve_tail(void)
{
current->thread.fpu.fpc = 0;
asm volatile("sfpc %0" : : "d" (0));