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runtime: manage stack by ourselves for badcallback on windows/amd64
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
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@ -60,7 +60,11 @@ loadregs:
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RET
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TEXT runtime·badcallback(SB),7,$48
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// This should be called on a system stack,
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// so we don't need to concern about split stack.
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TEXT runtime·badcallback(SB),7,$0
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SUBQ $48, SP
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// stderr
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MOVQ $-12, CX // stderr
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MOVQ CX, 0(SP)
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@ -80,6 +84,7 @@ TEXT runtime·badcallback(SB),7,$48
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MOVQ runtime·WriteFile(SB), AX
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CALL AX
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ADDQ $48, SP
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RET
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TEXT runtime·badsignal(SB),7,$48
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