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runtime: align C library startup calls on amd64

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This makes GOEXPERIMENT=framepointer, GOOS=darwin, and buildmode=carchive coexist.

Change-Id: I9f6fb2f0f06f27df683e5b51f2fa55cd21872453
Reviewed-on: https://go-review.googlesource.com/23454
Reviewed-by: Austin Clements <austin@google.com>
This commit is contained in:
Russ Cox 2016-05-25 17:24:11 -04:00
parent 3be48b4dc8
commit 10c8b2374f
1 changed files with 11 additions and 1 deletions
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12
src/runtime/rt0_darwin_amd64.s
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@ -12,7 +12,14 @@ TEXT _rt0_amd64_darwin(SB),NOSPLIT,$-8
// When linking with -shared, this symbol is called when the shared library
// is loaded.
TEXT _rt0_amd64_darwin_lib(SB),NOSPLIT,$0x48
TEXT _rt0_amd64_darwin_lib(SB),NOSPLIT,$0x58
// Align stack. We don't know whether Go is adding a frame pointer here or not.
MOVQ SP, R8
SUBQ $16, R8
ANDQ $~15, R8
XCHGQ SP, R8
MOVQ R8, 0x48(SP)
MOVQ BX, 0x18(SP)
MOVQ BP, 0x20(SP)
MOVQ R12, 0x28(SP)
@ -51,6 +58,9 @@ restore:
MOVQ 0x30(SP), R13
MOVQ 0x38(SP), R14
MOVQ 0x40(SP), R15
MOVQ 0x48(SP), R8
MOVQ R8, SP
RET
TEXT _rt0_amd64_darwin_lib_go(SB),NOSPLIT,$0