diff options
| -rw-r--r-- | arch/sparc64/kernel/entry.S | 30 | ||||
| -rw-r--r-- | arch/sparc64/kernel/stacktrace.c | 4 | ||||
| -rw-r--r-- | include/asm-sparc64/stacktrace.h | 6 |
3 files changed, 39 insertions, 1 deletions
diff --git a/arch/sparc64/kernel/entry.S b/arch/sparc64/kernel/entry.S index 6be4d2d2904e..49eca4b1cf25 100644 --- a/arch/sparc64/kernel/entry.S +++ b/arch/sparc64/kernel/entry.S @@ -1705,6 +1705,36 @@ __flushw_user: 2: retl nop + /* Flush %fp and %i7 to the stack for all register + * windows active inside of the cpu. This allows + * show_stack_trace() to avoid using an expensive + * 'flushw'. + */ + .globl stack_trace_flush + .type stack_trace_flush,#function +stack_trace_flush: + rdpr %pstate, %o0 + wrpr %o0, PSTATE_IE, %pstate + + rdpr %cwp, %g1 + rdpr %canrestore, %g2 + sub %g1, 1, %g3 + +1: brz,pn %g2, 2f + sub %g2, 1, %g2 + wrpr %g3, %cwp + stx %fp, [%sp + STACK_BIAS + RW_V9_I6] + stx %i7, [%sp + STACK_BIAS + RW_V9_I7] + ba,pt %xcc, 1b + sub %g3, 1, %g3 + +2: wrpr %g1, %cwp + wrpr %o0, %pstate + + retl + nop + .size stack_trace_flush,.-stack_trace_flush + #ifdef CONFIG_SMP .globl hard_smp_processor_id hard_smp_processor_id: diff --git a/arch/sparc64/kernel/stacktrace.c b/arch/sparc64/kernel/stacktrace.c index 47f92a59be18..84d39e873e88 100644 --- a/arch/sparc64/kernel/stacktrace.c +++ b/arch/sparc64/kernel/stacktrace.c @@ -2,13 +2,15 @@ #include <linux/stacktrace.h> #include <linux/thread_info.h> #include <asm/ptrace.h> +#include <asm/stacktrace.h> void save_stack_trace(struct stack_trace *trace) { unsigned long ksp, fp, thread_base; struct thread_info *tp = task_thread_info(current); - flushw_all(); + stack_trace_flush(); + __asm__ __volatile__( "mov %%fp, %0" : "=r" (ksp) diff --git a/include/asm-sparc64/stacktrace.h b/include/asm-sparc64/stacktrace.h new file mode 100644 index 000000000000..6cee39adf6d6 --- /dev/null +++ b/include/asm-sparc64/stacktrace.h @@ -0,0 +1,6 @@ +#ifndef _SPARC64_STACKTRACE_H +#define _SPARC64_STACKTRACE_H + +extern void stack_trace_flush(void); + +#endif /* _SPARC64_STACKTRACE_H */ |