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unix: always zero the higher bits of return value on linux/loong64 syscalls

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All loong64 syscalls return values only via R4/A0, and R5/A1 may contain
unrelated content. Always zero the second return value.

Change-Id: Ic889f33158c4e4999bd94bd768d1094e95bc6421
Reviewed-on: https://go-review.googlesource.com/c/sys/+/411634
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: David Chase <drchase@google.com>
This commit is contained in:
Guoqi Chen
2022-06-10 20:06:09 +08:00
committed by Austin Clements
parent 9f5ed59c13
commit 6c1b26c550
1 changed files with 2 additions and 2 deletions
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4
unix/asm_linux_loong64.s
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@@ -30,7 +30,7 @@ TEXT ·SyscallNoError(SB),NOSPLIT,$0-48
MOVV trap+0(FP), R11 // syscall entry
SYSCALL
MOVV R4, r1+32(FP)
MOVV R5, r2+40(FP)
MOVV R0, r2+40(FP) // r2 is not used. Always set to 0
JAL runtime·exitsyscall(SB)
RET
@@ -50,5 +50,5 @@ TEXT ·RawSyscallNoError(SB),NOSPLIT,$0-48
MOVV trap+0(FP), R11 // syscall entry
SYSCALL
MOVV R4, r1+32(FP)
MOVV R5, r2+40(FP)
MOVV R0, r2+40(FP) // r2 is not used. Always set to 0
RET