runtime: load errno as signed 32-bit
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>
diff --git a/src/runtime/sys_darwin_amd64.s b/src/runtime/sys_darwin_amd64.s
index 2a2e7379..db74352 100644
--- a/src/runtime/sys_darwin_amd64.s
+++ b/src/runtime/sys_darwin_amd64.s
@@ -306,7 +306,7 @@
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 @@
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
diff --git a/src/runtime/sys_darwin_arm64.s b/src/runtime/sys_darwin_arm64.s
index 4f9d0b8..d7ba116 100644
--- a/src/runtime/sys_darwin_arm64.s
+++ b/src/runtime/sys_darwin_arm64.s
@@ -70,7 +70,7 @@
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 @@
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
