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| author |   Vineet Gupta <vgupta@synopsys.com> | 2016-09-16 17:23:26 -0700 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2016-09-30 14:48:22 -0700 |
| commit | 5a205a32ffccf6e720a2d2b3aee44b16619016a6 (patch) | |
| tree | 9ff1460c48ecbcc382405826ff53c5329bd5a9dd /arch/arc/include/asm/dwarf.h | |
| parent | ARC: entry: make ret_from_system_call local label (diff) | |
| download | linux-dev-5a205a32ffccf6e720a2d2b3aee44b16619016a6.tar.xz linux-dev-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/include/asm/dwarf.h')
| -rw-r--r-- | arch/arc/include/asm/dwarf.h | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/arch/arc/include/asm/dwarf.h b/arch/arc/include/asm/dwarf.h new file mode 100644 index 000000000000..bb7bdbc59a44 --- /dev/null +++ b/arch/arc/include/asm/dwarf.h @@ -0,0 +1,38 @@ +/* + * Copyright (C) 2016-17 Synopsys, Inc. (www.synopsys.com) + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#ifndef _ASM_ARC_DWARF_H +#define _ASM_ARC_DWARF_H + +#ifdef __ASSEMBLY__ + +#ifdef ARC_DW2_UNWIND_AS_CFI + +#define CFI_STARTPROC .cfi_startproc +#define CFI_ENDPROC .cfi_endproc +#define CFI_DEF_CFA .cfi_def_cfa +#define CFI_REGISTER .cfi_register +#define CFI_REL_OFFSET .cfi_rel_offset +#define CFI_UNDEFINED .cfi_undefined + +#else + +#define CFI_IGNORE # + +#define CFI_STARTPROC CFI_IGNORE +#define CFI_ENDPROC CFI_IGNORE +#define CFI_DEF_CFA CFI_IGNORE +#define CFI_REGISTER CFI_IGNORE +#define CFI_REL_OFFSET CFI_IGNORE +#define CFI_UNDEFINED CFI_IGNORE + +#endif /* !ARC_DW2_UNWIND_AS_CFI */ + +#endif /* __ASSEMBLY__ */ + +#endif /* _ASM_ARC_DWARF_H */ |