This implements exception_check() as introduced by commit 14b43a09c93.
Signed-off-by: Eduard - Gabriel Munteanu <eduard.munte...@linux360.ro>
---
arch/x86/unwind_64.S | 26 ++++++++++++++++++++++++++
1 files changed, 26 insertions(+), 0 deletions(-)
diff --git a/arch/x86/unwind_64.S b/arch/x86/unwind_64.S
index b89ba0f..322e0fd 100644
--- a/arch/x86/unwind_64.S
+++ b/arch/x86/unwind_64.S
@@ -1,4 +1,5 @@
.global unwind
+.global exception_check
.text
/*
@@ -37,3 +38,28 @@ unwind:
pushq %rax
ret
+
+/*
+ * exception_check - is a part of valgrind workaround for exception guards.
+ * it checks whether exception has occurred and if it has control
+ * is transfered directly to exception handler (possibly unwind block).
+ */
+exception_check:
+ /* push return address - 1 */
+ push (%rsp)
+ decq (%rsp)
+
+ movq (%rsp), %rdi # return address - 1
+ call jit_lookup_cu
+
+ movq %rax, %rdi # cu
+ movq %rbp, %rsi # stack frame
+ pop %rdx # return address - 1
+ call throw_from_jit_checked
+
+ test %rax, %rax
+ jz 1f
+ push %rax
+ ret
+1:
+ ret
--
1.6.0.6
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