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parisc: Consolidate unwind initialization calls

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Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
Helge Deller
2018-08-17 17:00:08 +02:00
parent 54c770da99
commit 9e0d5c451f
4 changed files with 36 additions and 57 deletions
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37
arch/parisc/kernel/unwind.c
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@@ -403,9 +403,31 @@ void unwind_frame_init_from_blocked_task(struct unwind_frame_info *info, struct
kfree(r2);
}
void unwind_frame_init_running(struct unwind_frame_info *info, struct pt_regs *regs)
#define get_parisc_stackpointer() ({ \
unsigned long sp; \
__asm__("copy %%r30, %0" : "=r"(sp)); \
(sp); \
})
void unwind_frame_init_task(struct unwind_frame_info *info,
struct task_struct *task, struct pt_regs *regs)
{
unwind_frame_init(info, current, regs);
task = task ? task : current;
if (task == current) {
struct pt_regs r;
if (!regs) {
memset(&r, 0, sizeof(r));
r.iaoq[0] = _THIS_IP_;
r.gr[2] = _RET_IP_;
r.gr[30] = get_parisc_stackpointer();
regs = &r;
}
unwind_frame_init(info, task, &r);
} else {
unwind_frame_init_from_blocked_task(info, task);
}
}
int unwind_once(struct unwind_frame_info *next_frame)
@@ -442,19 +464,12 @@ int unwind_to_user(struct unwind_frame_info *info)
unsigned long return_address(unsigned int level)
{
struct unwind_frame_info info;
struct pt_regs r;
unsigned long sp;
/* initialize unwind info */
asm volatile ("copy %%r30, %0" : "=r"(sp));
memset(&r, 0, sizeof(struct pt_regs));
r.iaoq[0] = _THIS_IP_;
r.gr[2] = _RET_IP_;
r.gr[30] = sp;
unwind_frame_init(&info, current, &r);
unwind_frame_init_task(&info, current, NULL);
/* unwind stack */
++level;
level += 2;
do {
if (unwind_once(&info) < 0 || info.ip == 0)
return 0;