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runtime: load errno as signed 32-bit

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the function libc_errno returns a pointer to a signed-32 bit quantity,
not a 64-bit quantity.

Fixes #27004

Change-Id: I0623835ee34fd9655532251f096022a5accb58cd
Reviewed-on: https://go-review.googlesource.com/129475
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Keith Randall 2018-08-15 16:21:00 -07:00
parent 6502c11286
commit a68b713ef6
2 changed files with 4 additions and 4 deletions
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4
src/runtime/sys_darwin_amd64.s
View File

@ -306,7 +306,7 @@ TEXT runtime·mmap_trampoline(SB),NOSPLIT,$0
CMPQ AX, $-1
JNE ok
CALL libc_error(SB)
MOVQ (AX), DX // errno
MOVLQSX (AX), DX // errno
XORL AX, AX
ok:
MOVQ AX, 32(BX)
@ -371,7 +371,7 @@ TEXT runtime·kevent_trampoline(SB),NOSPLIT,$0
CMPQ AX, $-1
JNE ok
CALL libc_error(SB)
MOVQ (AX), AX // errno
MOVLQSX (AX), AX // errno
NEGQ AX // caller wants it as a negative error code
ok:
POPQ BP

4
src/runtime/sys_darwin_arm64.s
View File

@ -70,7 +70,7 @@ TEXT runtime·mmap_trampoline(SB),NOSPLIT,$0
CMP R0, R2
BNE ok
BL libc_error(SB)
MOVD (R0), R1
MOVW (R0), R1
MOVD $0, R0
ok:
MOVD R0, 32(R19) // ret 1 p
@ -277,7 +277,7 @@ TEXT runtime·kevent_trampoline(SB),NOSPLIT,$0
CMP R0, R2
BNE ok
BL libc_error(SB)
MOVD (R0), R0 // errno
MOVW (R0), R0 // errno
NEG R0, R0 // caller wants it as a negative error code
ok:
RET