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s390: move system_call field from thread_info to thread_struct

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The system_call field in thread_info structure is used by the signal
code to store the number of the current system call while the debugger
interacts with its inferior. A better location for the system_call
field is with the other debugger related information in the
thread_struct.

Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2016-11-08 11:11:02 +01:00
parent d5c352cdd0
commit f8fc82b471
4 changed files with 9 additions and 8 deletions
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2
arch/s390/include/asm/processor.h
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@ -115,9 +115,11 @@ struct thread_struct {
unsigned int gmap_write_flag; /* gmap fault write indication */
unsigned int gmap_int_code; /* int code of last gmap fault */
unsigned int gmap_pfault; /* signal of a pending guest pfault */
/* Per-thread information related to debugging */
struct per_regs per_user; /* User specified PER registers */
struct per_event per_event; /* Cause of the last PER trap */
unsigned long per_flags; /* Flags to control debug behavior */
unsigned int system_call; /* system call number in signal */
/* pfault_wait is used to block the process on a pfault event */
unsigned long pfault_wait;
struct list_head list;

1
arch/s390/include/asm/thread_info.h
View File

@ -32,7 +32,6 @@
struct thread_info {
unsigned long flags; /* low level flags */
unsigned long sys_call_table; /* System call table address */
unsigned int system_call;
__u64 user_timer;
__u64 system_timer;
unsigned long last_break; /* last breaking-event-address. */

4
arch/s390/kernel/ptrace.c
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@ -1113,7 +1113,7 @@ static int s390_system_call_get(struct task_struct *target,
unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf)
{
unsigned int *data = &task_thread_info(target)->system_call;
unsigned int *data = &target->thread.system_call;
return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
data, 0, sizeof(unsigned int));
}
@ -1123,7 +1123,7 @@ static int s390_system_call_set(struct task_struct *target,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
unsigned int *data = &task_thread_info(target)->system_call;
unsigned int *data = &target->thread.system_call;
return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
data, 0, sizeof(unsigned int));
}

10
arch/s390/kernel/signal.c
View File

@ -467,13 +467,13 @@ void do_signal(struct pt_regs *regs)
* the debugger may change all our registers, including the system
* call information.
*/
current_thread_info()->system_call =
current->thread.system_call =
test_pt_regs_flag(regs, PIF_SYSCALL) ? regs->int_code : 0;
if (get_signal(&ksig)) {
/* Whee! Actually deliver the signal. */
if (current_thread_info()->system_call) {
regs->int_code = current_thread_info()->system_call;
if (current->thread.system_call) {
regs->int_code = current->thread.system_call;
/* Check for system call restarting. */
switch (regs->gprs[2]) {
case -ERESTART_RESTARTBLOCK:
@ -506,8 +506,8 @@ void do_signal(struct pt_regs *regs)
/* No handlers present - check for system call restart */
clear_pt_regs_flag(regs, PIF_SYSCALL);
if (current_thread_info()->system_call) {
regs->int_code = current_thread_info()->system_call;
if (current->thread.system_call) {
regs->int_code = current->thread.system_call;
switch (regs->gprs[2]) {
case -ERESTART_RESTARTBLOCK:
/* Restart with sys_restart_syscall */