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runtime: avoid clobbering C callee-save register in cgoSigtramp 

Use R11 (a caller-saved temp register) instead of RBX (a callee-saved
register).

I believe this only affects linux/amd64, since it is the only platform
with a non-trivial cgoSigtramp implementation.

Updates #18328.

Change-Id: I3d35c4512624184d5a8ece653fa09ddf50e079a2
Reviewed-on: https://go-review.googlesource.com/35068
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Bryan C. Mills 2017-01-11 17:39:41 -05:00 committed by Ian Lance Taylor
parent f65abf6ddc
commit fdde7ba2a2
1 changed files with 2 additions and 2 deletions
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4
src/runtime/sys_linux_amd64.s
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@ -330,9 +330,9 @@ sigtrampnog:
// Lock sigprofCallersUse.
MOVL $0, AX
MOVL $1, CX
MOVQ $runtime·sigprofCallersUse(SB), BX
MOVQ $runtime·sigprofCallersUse(SB), R11
LOCK
CMPXCHGL CX, 0(BX)
CMPXCHGL CX, 0(R11)
JNZ sigtramp // Skip stack trace if already locked.
// Jump to the traceback function in runtime/cgo.