The CFI magic we emit as part of the indirect branch thunks in order to
have somewhat sane unwind information must not be emitted with
-fno-dwarf2-cfi-asm.
Committed to mainline, gcc-7-branch, and gcc-6-branch.
gcc/ChangeLog:
2018-04-12 Andreas Krebbel <kreb...@linux.vnet.ibm.com>
* config/s390/s390.c (s390_output_indirect_thunk_function): Check
also for flag_dwarf2_cfi_asm.
gcc/testsuite/ChangeLog:
2018-04-12 Andreas Krebbel <kreb...@linux.vnet.ibm.com>
* gcc.target/s390/nobp-no-dwarf2-cfi.c: New test.
---
gcc/config/s390/s390.c | 2 +-
gcc/testsuite/gcc.target/s390/nobp-no-dwarf2-cfi.c | 19 +++++++++++++++++++
2 files changed, 20 insertions(+), 1 deletion(-)
create mode 100644 gcc/testsuite/gcc.target/s390/nobp-no-dwarf2-cfi.c
diff --git a/gcc/config/s390/s390.c b/gcc/config/s390/s390.c
index 59f5de9..5add598 100644
--- a/gcc/config/s390/s390.c
+++ b/gcc/config/s390/s390.c
@@ -16522,7 +16522,7 @@ s390_output_indirect_thunk_function (unsigned int
regno, bool z10_p)
Stopping in the thunk: backtrace will point to the thunk target
is if it was interrupted by a signal. For a call this means that
the call chain will be: caller->callee->thunk */
- if (flag_asynchronous_unwind_tables)
+ if (flag_asynchronous_unwind_tables && flag_dwarf2_cfi_asm)
{
fputs ("\t.cfi_signal_frame\n", asm_out_file);
fprintf (asm_out_file, "\t.cfi_return_column %d\n", regno);
diff --git a/gcc/testsuite/gcc.target/s390/nobp-no-dwarf2-cfi.c
b/gcc/testsuite/gcc.target/s390/nobp-no-dwarf2-cfi.c
new file mode 100644
index 0000000..75e32a1
--- /dev/null
+++ b/gcc/testsuite/gcc.target/s390/nobp-no-dwarf2-cfi.c
@@ -0,0 +1,19 @@
+/* { dg-do run } */
+/* { dg-options "-O3 -march=z900 --save-temps -mfunction-return-reg=thunk
-mindirect-branch-table -fno-dwarf2-cfi-asm" } */
+
+/* Make sure that we do not emit .cfi directives when -fno-dwarf2-cfi-asm is
being used. */
+
+int
+main ()
+{
+ return 0;
+}
+
+/* 1 x main
+/* { dg-final { scan-assembler-times "jg\t__s390_indirect_jump" 1 } } */
+/* { dg-final { scan-assembler "ex\t" } } */
+
+/* { dg-final { scan-assembler-not "section\t.s390_indirect_jump" } } */
+/* { dg-final { scan-assembler-not "section\t.s390_indirect_call" } } */
+/* { dg-final { scan-assembler "section\t.s390_return_reg" } } */
+/* { dg-final { scan-assembler-not "section\t.s390_return_mem" } } */
--
2.9.1
