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authorDavid S. Miller <davem@davemloft.net>2008-07-30 21:57:59 -0700
committerDavid S. Miller <davem@davemloft.net>2008-07-30 21:57:59 -0700
commit5afe27380bc42454254c9c83c045240249c15e35 (patch)
treee7bdb90ea5e42b779b9ddeea9d945638da33eb23 /arch/sparc64/mm
parentc9b23e0c302377ccff700bee663b878d04e4ef3a (diff)
downloadop-kernel-dev-5afe27380bc42454254c9c83c045240249c15e35.zip
op-kernel-dev-5afe27380bc42454254c9c83c045240249c15e35.tar.gz
sparc64: Make global reg dumping even more useful.
Record one more level of stack frame program counter. Particularly when lockdep and all sorts of spinlock debugging is enabled, figuring out the caller of spin_lock() is difficult when the cpu is stuck on the lock. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc64/mm')
-rw-r--r--arch/sparc64/mm/ultra.S7
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/sparc64/mm/ultra.S b/arch/sparc64/mm/ultra.S
index 4c8ca13..77ba885 100644
--- a/arch/sparc64/mm/ultra.S
+++ b/arch/sparc64/mm/ultra.S
@@ -531,6 +531,13 @@ xcall_fetch_glob_regs:
stx %g7, [%g1 + GR_SNAP_TNPC]
stx %o7, [%g1 + GR_SNAP_O7]
stx %i7, [%g1 + GR_SNAP_I7]
+ /* Don't try this at home kids... */
+ rdpr %cwp, %g2
+ sub %g2, 1, %g7
+ wrpr %g7, %cwp
+ mov %i7, %g7
+ wrpr %g2, %cwp
+ stx %g7, [%g1 + GR_SNAP_RPC]
sethi %hi(trap_block), %g7
or %g7, %lo(trap_block), %g7
sllx %g2, TRAP_BLOCK_SZ_SHIFT, %g2
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