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runtime: fix invalid pointer in windows/arm64 badsignal2

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Initializes the R3 register with an available address in the stack. The addressed location is used to receive the number of bytes written by WriteFile.

Fixes #56080

Change-Id: I0368eb7a31d2d6a098fa9c26e074eb1114a92704
GitHub-Last-Rev: 23dbdb5378
GitHub-Pull-Request: golang/go#56153
Reviewed-on: https://go-review.googlesource.com/c/go/+/442216
Reviewed-by: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Cherry Mui <cherryyz@google.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
This commit is contained in:
Bill Zissimopoulos 2022-10-12 10:39:27 +00:00 committed by David Chase
parent 5bef938125
commit 4a4de14166
1 changed files with 2 additions and 1 deletions
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3
src/runtime/sys_windows_arm64.s
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@ -113,7 +113,8 @@ TEXT runtime·badsignal2(SB),NOSPLIT,$16-0
MOVD $runtime·badsignalmsg(SB), R1 // lpBuffer
MOVD $runtime·badsignallen(SB), R2 // lpNumberOfBytesToWrite
MOVD (R2), R2
MOVD R13, R3 // lpNumberOfBytesWritten
// point R3 to stack local that will receive number of bytes written
ADD $16, RSP, R3 // lpNumberOfBytesWritten
MOVD $0, R4 // lpOverlapped
MOVD runtime·_WriteFile(SB), R12
SUB $16, RSP // skip over saved frame pointer below RSP