44 lines
1.4 KiB
Diff
44 lines
1.4 KiB
Diff
From 315f4c70f123cfbf061d097543af555547acd9c7 Mon Sep 17 00:00:00 2001
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From: Shenghou Ma <minux@golang.org>
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Date: Thu, 18 Feb 2016 16:29:39 -0500
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Subject: [PATCH] runtime: use correct psABI SP alignment before calling libc
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mmap
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Fixes #14384.
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Change-Id: Ib025cf2d20754b4c2db52f0a8a4717fd303371d6
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Reviewed-on: https://go-review.googlesource.com/19660
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Run-TryBot: Minux Ma <minux@golang.org>
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TryBot-Result: Gobot Gobot <gobot@golang.org>
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Reviewed-by: Ian Lance Taylor <iant@golang.org>
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Reviewed-by: Austin Clements <austin@google.com>
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---
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src/runtime/sys_linux_amd64.s | 6 +++++-
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1 file changed, 5 insertions(+), 1 deletion(-)
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diff --git a/src/runtime/sys_linux_amd64.s b/src/runtime/sys_linux_amd64.s
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index aed85cb..f407078 100644
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--- a/src/runtime/sys_linux_amd64.s
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+++ b/src/runtime/sys_linux_amd64.s
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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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