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[S390] single-step cleanup

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Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Roland McGrath 2008-01-26 14:11:22 +01:00 committed by Martin Schwidefsky
parent ea29ee16e6
commit 0ac30be461
3 changed files with 27 additions and 16 deletions
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15
arch/s390/kernel/ptrace.c
View file

@ -86,13 +86,13 @@ FixPerRegisters(struct task_struct *task)
per_info->control_regs.bits.storage_alt_space_ctl = 0;
}
static void set_single_step(struct task_struct *task)
void user_enable_single_step(struct task_struct *task)
{
task->thread.per_info.single_step = 1;
FixPerRegisters(task);
}
static void clear_single_step(struct task_struct *task)
void user_disable_single_step(struct task_struct *task)
{
task->thread.per_info.single_step = 0;
FixPerRegisters(task);
@ -107,7 +107,7 @@ void
ptrace_disable(struct task_struct *child)
{
/* make sure the single step bit is not set. */
clear_single_step(child);
user_disable_single_step(child);
}
#ifndef CONFIG_64BIT
@ -651,7 +651,7 @@ do_ptrace(struct task_struct *child, long request, long addr, long data)
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
child->exit_code = data;
/* make sure the single step bit is not set. */
clear_single_step(child);
user_disable_single_step(child);
wake_up_process(child);
return 0;
@ -665,7 +665,7 @@ do_ptrace(struct task_struct *child, long request, long addr, long data)
return 0;
child->exit_code = SIGKILL;
/* make sure the single step bit is not set. */
clear_single_step(child);
user_disable_single_step(child);
wake_up_process(child);
return 0;
@ -675,10 +675,7 @@ do_ptrace(struct task_struct *child, long request, long addr, long data)
return -EIO;
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
child->exit_code = data;
if (data)
set_tsk_thread_flag(child, TIF_SINGLE_STEP);
else
set_single_step(child);
user_enable_single_step(child);
/* give it a chance to run. */
wake_up_process(child);
return 0;

20
arch/s390/kernel/signal.c
View file

@ -471,6 +471,7 @@ void do_signal(struct pt_regs *regs)
if (signr > 0) {
/* Whee! Actually deliver the signal. */
int ret;
#ifdef CONFIG_COMPAT
if (test_thread_flag(TIF_31BIT)) {
extern int handle_signal32(unsigned long sig,
@ -478,15 +479,12 @@ void do_signal(struct pt_regs *regs)
siginfo_t *info,
sigset_t *oldset,
struct pt_regs *regs);
if (handle_signal32(
signr, &ka, &info, oldset, regs) == 0) {
if (test_thread_flag(TIF_RESTORE_SIGMASK))
clear_thread_flag(TIF_RESTORE_SIGMASK);
}
return;
ret = handle_signal32(signr, &ka, &info, oldset, regs);
}
else
#endif
if (handle_signal(signr, &ka, &info, oldset, regs) == 0) {
ret = handle_signal(signr, &ka, &info, oldset, regs);
if (!ret) {
/*
* A signal was successfully delivered; the saved
* sigmask will have been stored in the signal frame,
@ -495,6 +493,14 @@ void do_signal(struct pt_regs *regs)
*/
if (test_thread_flag(TIF_RESTORE_SIGMASK))
clear_thread_flag(TIF_RESTORE_SIGMASK);
/*
* If we would have taken a single-step trap
* for a normal instruction, act like we took
* one for the handler setup.
*/
if (current->thread.per_info.single_step)
set_thread_flag(TIF_SINGLE_STEP);
}
return;
}

8
include/asm-s390/ptrace.h
View file

@ -465,6 +465,14 @@ struct user_regs_struct
#ifdef __KERNEL__
#define __ARCH_SYS_PTRACE 1
/*
* These are defined as per linux/ptrace.h, which see.
*/
#define arch_has_single_step() (1)
struct task_struct;
extern void user_enable_single_step(struct task_struct *);
extern void user_disable_single_step(struct task_struct *);
#define user_mode(regs) (((regs)->psw.mask & PSW_MASK_PSTATE) != 0)
#define instruction_pointer(regs) ((regs)->psw.addr & PSW_ADDR_INSN)
#define regs_return_value(regs)((regs)->gprs[2])