Terminate the unwinding by telling unwinder to fetch return address
(BLINK) from r15 which has been set apriori to 0.
Signed-off-by: Vineet Gupta <vgupta@xxxxxxxxxxxx>
---
ChangeLog | 2 ++
sysdeps/unix/sysv/linux/arc/makecontext.c | 1 +
sysdeps/unix/sysv/linux/arc/setcontext.S | 2 ++
3 files changed, 5 insertions(+)
diff --git a/ChangeLog b/ChangeLog
index d3a979a9236b..39ff298b0091 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -110,6 +110,8 @@
* sysdeps/arc/entry.h: Add ENTRY_POINT define check.
* sysdeps/arc/crti.S: add .hidden annotations.
* sysdeps/unix/sysv/linux/arc/ipc_priv.h: New file.
+ * sysdeps/unix/sysv/linux/arc/makecontext.c: clear r15.
+ * sysdeps/unix/sysv/linux/arc/setcontext.S: set blink from r15.
2018-12-17 Joseph Myers <joseph@xxxxxxxxxxxxxxxx>
diff --git a/sysdeps/unix/sysv/linux/arc/makecontext.c b/sysdeps/unix/sysv/linux/arc/makecontext.c
index 7018bed9d64a..8d233f83da7e 100644
--- a/sysdeps/unix/sysv/linux/arc/makecontext.c
+++ b/sysdeps/unix/sysv/linux/arc/makecontext.c
@@ -45,6 +45,7 @@ __makecontext (ucontext_t *ucp, void (*func) (void), int argc, ...)
*/
ucp->uc_mcontext.callee.r13 = (unsigned long) func;
ucp->uc_mcontext.callee.r14 = (unsigned long) ucp->uc_link;
+ ucp->uc_mcontext.callee.r15 = 0;
r = &ucp->uc_mcontext.scratch.r0;
diff --git a/sysdeps/unix/sysv/linux/arc/setcontext.S b/sysdeps/unix/sysv/linux/arc/setcontext.S
index 3f503c661d95..6ec2ec0ddc79 100644
--- a/sysdeps/unix/sysv/linux/arc/setcontext.S
+++ b/sysdeps/unix/sysv/linux/arc/setcontext.S
@@ -79,6 +79,8 @@ weak_alias(__setcontext, setcontext)
ENTRY(__startcontext)
+ cfi_register (blink, r15)
+
/* call user @func, loaded in r13 by setcontext() */
jl [r13]
--
2.7.4
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