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| author | Vineet Gupta <vgupta@synopsys.com> | 2016-09-17 02:23:26 +0200 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2016-09-30 23:48:22 +0200 |
| commit | 5a205a32ffccf6e720a2d2b3aee44b16619016a6 (patch) | |
| tree | 9ff1460c48ecbcc382405826ff53c5329bd5a9dd /arch/arc/Makefile | |
| parent | ARC: entry: make ret_from_system_call local label (diff) | |
| download | linux-5a205a32ffccf6e720a2d2b3aee44b16619016a6.tar.xz linux-5a205a32ffccf6e720a2d2b3aee44b16619016a6.zip | |
ARC: dw2 unwind: add infrastructure for adding cfi pseudo ops to asm
1. detect whether binutils supports the cfi pseudo ops
2. define conditional macros to generate the ops
3. define new ENTRY_CFI/END_CFI to annotate hand asm code.
- Needed because we don't want to emit dwarf info in general ENTRY/END
used by lowest level trap/exception/interrutp handlers as unwinder
gets confused trying to unwind out of them. We want unwinder to
instead stop when it hits onfo those routines
- These provide minimal start/end cfi ops assuming routine doesn't
touch stack memory/regs
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc/Makefile')
| -rw-r--r-- | arch/arc/Makefile | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/arc/Makefile b/arch/arc/Makefile index a2a6a4614241..aa82d13d4213 100644 --- a/arch/arc/Makefile +++ b/arch/arc/Makefile @@ -65,7 +65,8 @@ endif endif -cflags-$(CONFIG_ARC_DW2_UNWIND) += -fasynchronous-unwind-tables +cfi := $(call as-instr,.cfi_startproc\n.cfi_endproc,-DARC_DW2_UNWIND_AS_CFI) +cflags-$(CONFIG_ARC_DW2_UNWIND) += -fasynchronous-unwind-tables $(cfi) ifndef CONFIG_CC_OPTIMIZE_FOR_SIZE # Generic build system uses -O2, we want -O3 |