runtime: unregister the SIGILL handler after ARM EABI test
Part of issue 3381
R=rsc, minux.ma, dave
CC=golang-dev
https://golang.org/cl/5969064
diff --git a/src/pkg/runtime/rt0_linux_arm.s b/src/pkg/runtime/rt0_linux_arm.s
index e08cf90..54ea860 100644
--- a/src/pkg/runtime/rt0_linux_arm.s
+++ b/src/pkg/runtime/rt0_linux_arm.s
@@ -20,15 +20,23 @@
MOVM.DB.W [R0-R3], (R13)
MOVW $4, R0 // SIGILL
MOVW R13, R1 // sa
- MOVW $0, R2 // old_sa
+ SUB $16, R13
+ MOVW R13, R2 // old_sa
MOVW $8, R3 // c
MOVW $174, R7 // sys_sigaction
BL oabi_syscall<>(SB)
- ADD $16, R13
+
// do an EABI syscall
MOVW $20, R7 // sys_getpid
- SWI $0 // this will trigger SIGILL on OABI systems
-
+ SWI $0 // this will trigger SIGILL on OABI systems
+
+ MOVW $4, R0 // SIGILL
+ MOVW R13, R1 // sa
+ MOVW $0, R2 // old_sa
+ MOVW $8, R3 // c
+ MOVW $174, R7 // sys_sigaction
+ SWI $0 // restore signal handler
+ ADD $32, R13
B _rt0_arm(SB)
TEXT bad_abi<>(SB),7,$-4
