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runtime: fix badsignal2 to initialize r3 with a valid address #50822

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5 changes: 3 additions & 2 deletions src/runtime/sys_windows_arm64.s
Original file line number Diff line number Diff line change
Expand Up @@ -112,10 +112,11 @@ 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
MOVD $0, R4 // lpOverlapped
MOVD runtime·_WriteFile(SB), R12
SUB $16, RSP // skip over saved frame pointer below RSP
MOVD RSP, R3 // lpNumberOfBytesWritten, point to stack - 24 bytes (see next instruction)
SUB $24, R3
SUB $32, RSP // skip over saved frame pointer, lpNumberOfBytesWritten and align to 16 bytes
BL (R12)

// Does not return.
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