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commit 49033c9c57a415db02ac5d98badf5f53342bca83
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Author: krebbel <krebbel@138bc75d-0d04-0410-961f-82ee72b054a4>
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Date: Thu Apr 12 09:14:57 2018 +0000
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IBM Z: Spectre: Prevent thunk cfi to be emitted with -fno-dwarf2-cfi-asm
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The CFI magic we emit as part of the indirect branch thunks in order to
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have somewhat sane unwind information must not be emitted with
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-fno-dwarf2-cfi-asm.
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gcc/ChangeLog:
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2018-04-12 Andreas Krebbel <krebbel@linux.vnet.ibm.com>
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* config/s390/s390.c (s390_output_indirect_thunk_function): Check
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also for flag_dwarf2_cfi_asm.
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gcc/testsuite/ChangeLog:
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2018-04-12 Andreas Krebbel <krebbel@linux.vnet.ibm.com>
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* gcc.target/s390/nobp-no-dwarf2-cfi.c: New test.
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git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@259340 138bc75d-0d04-0410-961f-82ee72b054a4
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diff -Nrup gcc/config/s390/s390.c gcc/config/s390/s390.c
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--- gcc/config/s390/s390.c 2018-04-18 13:35:43.856279249 -0600
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+++ gcc/config/s390/s390.c 2018-04-18 13:36:21.037007877 -0600
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@@ -14091,7 +14091,7 @@ s390_output_indirect_thunk_function (uns
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calls: Instead of caller->thunk the backtrace will be
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caller->callee->thunk */
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- if (flag_asynchronous_unwind_tables)
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+ if (flag_asynchronous_unwind_tables && flag_dwarf2_cfi_asm)
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{
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fputs ("\t.cfi_signal_frame\n", asm_out_file);
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fprintf (asm_out_file, "\t.cfi_return_column %d\n", regno);
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diff --git gcc/testsuite/gcc.target/s390/nobp-no-dwarf2-cfi.c gcc/testsuite/gcc.target/s390/nobp-no-dwarf2-cfi.c
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new file mode 100644
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index 0000000..75e32a1
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--- /dev/null
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+++ gcc/testsuite/gcc.target/s390/nobp-no-dwarf2-cfi.c
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@@ -0,0 +1,19 @@
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+/* { dg-do run } */
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+/* { dg-options "-O3 -march=z900 --save-temps -mfunction-return-reg=thunk -mindirect-branch-table -fno-dwarf2-cfi-asm" } */
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+
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+/* Make sure that we do not emit .cfi directives when -fno-dwarf2-cfi-asm is being used. */
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+
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+int
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+main ()
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+{
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+ return 0;
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+}
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+
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+/* 1 x main
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+/* { dg-final { scan-assembler-times "jg\t__s390_indirect_jump" 1 } } */
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+/* { dg-final { scan-assembler "ex\t" } } */
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+
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+/* { dg-final { scan-assembler-not "section\t.s390_indirect_jump" } } */
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+/* { dg-final { scan-assembler-not "section\t.s390_indirect_call" } } */
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+/* { dg-final { scan-assembler "section\t.s390_return_reg" } } */
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+/* { dg-final { scan-assembler-not "section\t.s390_return_mem" } } */
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