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runtime: use correct psABI SP alignment before calling libc mmap
Fixes #14384. Change-Id: Ib025cf2d20754b4c2db52f0a8a4717fd303371d6 Reviewed-on: https://go-review.googlesource.com/19660 Run-TryBot: Minux Ma <minux@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org> Reviewed-by: Austin Clements <austin@google.com>
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@ -258,7 +258,7 @@ TEXT runtime·sysMmap(SB),NOSPLIT,$0
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// Call the function stored in _cgo_mmap using the GCC calling convention.
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// This must be called on the system stack.
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TEXT runtime·callCgoMmap(SB),NOSPLIT,$0
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TEXT runtime·callCgoMmap(SB),NOSPLIT,$16
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MOVQ addr+0(FP), DI
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MOVQ n+8(FP), SI
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MOVL prot+16(FP), DX
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@ -266,7 +266,11 @@ TEXT runtime·callCgoMmap(SB),NOSPLIT,$0
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MOVL fd+24(FP), R8
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MOVL off+28(FP), R9
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MOVQ _cgo_mmap(SB), AX
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MOVQ SP, BX
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ANDQ $~15, SP // alignment as per amd64 psABI
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MOVQ BX, 0(SP)
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CALL AX
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MOVQ 0(SP), SP
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MOVQ AX, ret+32(FP)
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RET
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