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| author | Bryan C. Mills <bcmills@google.com> | 2016-12-15 14:21:13 -0800 |
|---|---|---|
| committer | Ian Lance Taylor <iant@golang.org> | 2016-12-15 23:41:06 +0000 |
| commit | 29cb72154d3bb3530d8092cc89d35b3ed4f7e9c5 (patch) | |
| tree | 709d55025d6e18c828487a53a58070d2656ebc42 /src/runtime/sys_openbsd_amd64.s | |
| parent | c1d449c42c6ea3c61f4636d1e9412b660be6f6bd (diff) | |
| download | go-29cb72154d3bb3530d8092cc89d35b3ed4f7e9c5.tar.gz go-29cb72154d3bb3530d8092cc89d35b3ed4f7e9c5.zip | |
runtime: preserve callee-saved C registers in sigtramp
This fixes Linux and the *BSD platforms on 386/amd64.
A few OS/arch combinations were already saving registers and/or doing
something that doesn't clearly resemble the SysV C ABI; those have
been left alone.
Fixes #18328.
Change-Id: I6398f6c71020de108fc8b26ca5946f0ba0258667
Reviewed-on: https://go-review.googlesource.com/34501
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Diffstat (limited to 'src/runtime/sys_openbsd_amd64.s')
| -rw-r--r-- | src/runtime/sys_openbsd_amd64.s | 25 |
1 files changed, 21 insertions, 4 deletions
diff --git a/src/runtime/sys_openbsd_amd64.s b/src/runtime/sys_openbsd_amd64.s index 6ca5a81d2a..cf7a3fb7a9 100644 --- a/src/runtime/sys_openbsd_amd64.s +++ b/src/runtime/sys_openbsd_amd64.s @@ -242,11 +242,28 @@ TEXT runtime·sigfwd(SB),NOSPLIT,$0-32 POPQ BP RET -TEXT runtime·sigtramp(SB),NOSPLIT,$24 - MOVQ DI, 0(SP) - MOVQ SI, 8(SP) - MOVQ DX, 16(SP) +TEXT runtime·sigtramp(SB),NOSPLIT,$72 + // Save callee-saved C registers, since the caller may be a C signal handler. + MOVQ BX, bx-8(SP) + MOVQ BP, bp-16(SP) // save in case GOEXPERIMENT=noframepointer is set + MOVQ R12, r12-24(SP) + MOVQ R13, r13-32(SP) + MOVQ R14, r14-40(SP) + MOVQ R15, r15-48(SP) + // We don't save mxcsr or the x87 control word because sigtrampgo doesn't + // modify them. + + MOVQ DX, ctx-56(SP) + MOVQ SI, info-64(SP) + MOVQ DI, signum-72(SP) CALL runtime·sigtrampgo(SB) + + MOVQ r15-48(SP), R15 + MOVQ r14-40(SP), R14 + MOVQ r13-32(SP), R13 + MOVQ r12-24(SP), R12 + MOVQ bp-16(SP), BP + MOVQ bx-8(SP), BX RET TEXT runtime·mmap(SB),NOSPLIT,$0 |