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authorAndreas Schwab <schwab@suse.de>2016-08-08 09:29:18 +0200
committerAndreas Schwab <schwab@suse.de>2016-08-15 17:10:21 +0200
commit9e2ff6c9cc54c0b4402b8d49e4abe7000fde7617 (patch)
tree836351fddf2c2f3ab7a690e25df3b3d8e44943e3 /sysdeps
parent89b7dd27eab6c265e97f028fab6e3977c54a5fa6 (diff)
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arm: mark __startcontext as .cantunwind (bug 20435)
__startcontext marks the bottom of the call stack of the contexts created by makecontext.
Diffstat (limited to 'sysdeps')
-rw-r--r--sysdeps/unix/sysv/linux/arm/setcontext.S7
1 files changed, 7 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/arm/setcontext.S b/sysdeps/unix/sysv/linux/arm/setcontext.S
index 603e508858..d1f168fece 100644
--- a/sysdeps/unix/sysv/linux/arm/setcontext.S
+++ b/sysdeps/unix/sysv/linux/arm/setcontext.S
@@ -86,12 +86,19 @@ weak_alias(__setcontext, setcontext)
/* Called when a makecontext() context returns. Start the
context in R4 or fall through to exit(). */
+ /* Unwind descriptors are looked up based on PC - 2, so we have to
+ make sure to mark the instruction preceding the __startcontext
+ label as .cantunwind. */
+ .fnstart
+ .cantunwind
+ nop
ENTRY(__startcontext)
movs r0, r4
bne PLTJMP(__setcontext)
@ New context was 0 - exit
b PLTJMP(HIDDEN_JUMPTARGET(exit))
+ .fnend
END(__startcontext)
#ifdef PIC