[klibc] arm/setjmp.S: fix longjmp
There's a real bug in the ARM assembly version of longjmp in
usr/klibc/arch/arm/setjmp.S: it will always pass back its first
argument as a return value, even if it's 0 (see the man page for
more details). Oddly, the Thumb implementation in the same file
*is* correct!
Signed-off-by: Steve McIntyre <steve@einval.com>
Signed-off-by: maximilian attems <max@stro.at>
diff --git a/usr/klibc/arch/arm/setjmp.S b/usr/klibc/arch/arm/setjmp.S
index 6018bda..d351e0e 100644
--- a/usr/klibc/arch/arm/setjmp.S
+++ b/usr/klibc/arch/arm/setjmp.S
@@ -41,7 +41,9 @@
longjmp:
ldmia r0, {r4, r5, r6, r7, r8, r9, r10, fp, sp, lr}
mov r0, r1
- BX(lr)
+ bne 1f
+ mov r0, #1
+1: BX(lr)
.size longjmp,.-longjmp
#else /* __thumb__ */
