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runtime: manage stack by ourselves for badcallback on windows/amd64

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This function uses 48-byte of precious non-split stack for every callback
function, and without this CL, it can easily overflow the non-split stack.
I encountered this when trying to enable misc/cgo/test on windows/amd64.

R=rsc
CC=golang-dev
https://golang.org/cl/5784075
This commit is contained in:
Shenghou Ma 2012-03-15 02:24:49 +08:00
parent 1ddc9feb53
commit b2a9079e54
1 changed files with 6 additions and 1 deletions
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7
src/pkg/runtime/sys_windows_amd64.s
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@ -60,7 +60,11 @@ loadregs:
RET
TEXT runtime·badcallback(SB),7,$48
// This should be called on a system stack,
// so we don't need to concern about split stack.
TEXT runtime·badcallback(SB),7,$0
SUBQ $48, SP
// stderr
MOVQ $-12, CX // stderr
MOVQ CX, 0(SP)
@ -80,6 +84,7 @@ TEXT runtime·badcallback(SB),7,$48
MOVQ runtime·WriteFile(SB), AX
CALL AX
ADDQ $48, SP
RET
TEXT runtime·badsignal(SB),7,$48