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| author | Tejun Heo <tj@kernel.org> | 2013-04-30 15:27:10 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-04-30 17:04:01 -0700 |
| commit | 89e3f23da9c827bfa9806c3d4da83a12c1c8543a (patch) | |
| tree | b4eaba8afe11cf9cac42d0fd7cc5d49718a9c2d1 /arch/sparc | |
| parent | a77f2a4e6f03f0fe0aedb5b13b31be8f9d66d10d (diff) | |
| download | blackbird-op-linux-89e3f23da9c827bfa9806c3d4da83a12c1c8543a.tar.gz blackbird-op-linux-89e3f23da9c827bfa9806c3d4da83a12c1c8543a.zip | |
sparc32: make show_stack() acquire %fp if @_ksp is not specified
show_stack(current or NULL, NULL) is used by arch-independent code to dump
backtrace of the current task; however, sparc32 show_stack() doesn't
implement it and wouldn't print any backtrace when NULL @_ksp is specfied.
Make show_stack() acquire and use %fp if @tsk is NULL or current and @_ksp
is NULL. This makes %fp fetching in dump_stack() unnecessary. Make it
use NULL for @_ksp instead.
Only compile tested.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: David S. Miller <davem@davemloft.net>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Fengguang Wu <fengguang.wu@intel.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Jesper Nilsson <jesper.nilsson@axis.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Mike Frysinger <vapier@gentoo.org>
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/sparc')
| -rw-r--r-- | arch/sparc/kernel/process_32.c | 16 |
1 files changed, 7 insertions, 9 deletions
diff --git a/arch/sparc/kernel/process_32.c b/arch/sparc/kernel/process_32.c index c85241006e32..2be4214b3905 100644 --- a/arch/sparc/kernel/process_32.c +++ b/arch/sparc/kernel/process_32.c @@ -142,11 +142,13 @@ void show_stack(struct task_struct *tsk, unsigned long *_ksp) struct reg_window32 *rw; int count = 0; - if (tsk != NULL) - task_base = (unsigned long) task_stack_page(tsk); - else - task_base = (unsigned long) current_thread_info(); + if (!tsk) + tsk = current; + if (tsk == current && !_ksp) + __asm__ __volatile__("mov %%fp, %0" : "=r" (_ksp)); + + task_base = (unsigned long) task_stack_page(tsk); fp = (unsigned long) _ksp; do { /* Bogus frame pointer? */ @@ -164,11 +166,7 @@ void show_stack(struct task_struct *tsk, unsigned long *_ksp) void dump_stack(void) { - unsigned long *ksp; - - __asm__ __volatile__("mov %%fp, %0" - : "=r" (ksp)); - show_stack(current, ksp); + show_stack(current, NULL); } EXPORT_SYMBOL(dump_stack); |
