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| author | Paul Mackerras <paulus@samba.org> | 2008-04-14 15:11:02 +0400 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2008-04-14 15:11:02 +0400 |
| commit | ac7c5353b189e10cf5dd27399f64f7b013abffc6 (patch) | |
| tree | 8222d92b774c256d6ec4399c716d76b3f05ddc4b /arch/sparc64/kernel/entry.S | |
| parent | a8f75ea70c58546205fb7673be41455b9da5d9a7 (diff) | |
| parent | 120dd64cacd4fb796bca0acba3665553f1d9ecaa (diff) | |
| download | linux-ac7c5353b189e10cf5dd27399f64f7b013abffc6.tar.xz | |
Merge branch 'linux-2.6'
Diffstat (limited to 'arch/sparc64/kernel/entry.S')
| -rw-r--r-- | arch/sparc64/kernel/entry.S | 30 |
1 files changed, 30 insertions, 0 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: |