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| author | Andrew Burgess <andrew.burgess@embecosm.com> | 2019-11-04 12:27:45 +0000 |
|---|---|---|
| committer | Andrew Burgess <andrew.burgess@embecosm.com> | 2019-11-18 10:30:21 +0000 |
| commit | 66f8b2cbbb675ccbcae56e2bdb6dae485878ec00 (patch) | |
| tree | 74128ccf4156406fd2deebe1b4b092eab1b60063 /gas/as.c | |
| parent | f1e8bd2dd26cbe08d3722a9e12844e290e47a1d2 (diff) | |
| download | binutils-gdb-66f8b2cbbb675ccbcae56e2bdb6dae485878ec00.tar.gz | |
gas: Add --gdwarf-cie-version command line flag
Add a flag to control the version of CIE that is generated. By
default gas produces CIE version 1, and this continues to be the
default after this patch.
However, a user can now provide --gdwarf-cie-version=NUMBER to switch
to either version 3 or version 4 of CIE, version 2 was never released,
and so causes an error as does any number less than 1 or greater than
4.
Producing version 4 CIE requires two new fields to be added to the
CIE, an address size field, and an segment selector field. For a flat
address space the DWARF specification indicates that the segment
selector should be 0, and the address size fields just contains the
address size in bytes. For now we support 4 or 8 byte addresses, and
the segment selector is always produced as 0. At some future time we
might need to allow targets to override this.
gas/ChangeLog:
* as.c (parse_args): Parse --gdwarf-cie-version option.
(flag_dwarf_cie_version): New variable.
* as.h (flag_dwarf_cie_version): Declare.
* dw2gencfi.c (output_cie): Switch from DW_CIE_VERSION to
flag_dwarf_cie_version.
* doc/as.texi (Overview): Document --gdwarf-cie-version.
* NEWS: Likewise.
* testsuite/gas/cfi/cfi.exp: Add new tests.
* testsuite/gas/cfi/cie-version-0.d: New file.
* testsuite/gas/cfi/cie-version-1.d: New file.
* testsuite/gas/cfi/cie-version-2.d: New file.
* testsuite/gas/cfi/cie-version-3.d: New file.
* testsuite/gas/cfi/cie-version-4.d: New file.
* testsuite/gas/cfi/cie-version.s: New file.
include/ChangeLog:
* dwarf2.h (DW_CIE_VERSION): Delete.
Change-Id: I9de19461aeb8332b5a57bbfe802953d0725a7ae8
Diffstat (limited to 'gas/as.c')
| -rw-r--r-- | gas/as.c | 17 |
1 files changed, 17 insertions, 0 deletions
@@ -95,6 +95,11 @@ int debug_memory = 0; /* Enable verbose mode. */ int verbose = 0; +/* Which version of DWARF CIE to produce. The default could be overridden + by a target during its initialisation, or by the --gdwarf-cie-version + command line flag. */ +int flag_dwarf_cie_version = 1; + #if defined OBJ_ELF || defined OBJ_MAYBE_ELF int flag_use_elf_stt_common = DEFAULT_GENERATE_ELF_STT_COMMON; bfd_boolean flag_generate_build_notes = DEFAULT_GENERATE_BUILD_NOTES; @@ -479,6 +484,7 @@ parse_args (int * pargc, char *** pargv) OPTION_GSTABS_PLUS, OPTION_GDWARF2, OPTION_GDWARF_SECTIONS, + OPTION_GDWARF_CIE_VERSION, OPTION_STRIP_LOCAL_ABSOLUTE, OPTION_TRADITIONAL_FORMAT, OPTION_WARN, @@ -534,6 +540,7 @@ parse_args (int * pargc, char *** pargv) so we keep it here for backwards compatibility. */ ,{"gdwarf2", no_argument, NULL, OPTION_GDWARF2} ,{"gdwarf-sections", no_argument, NULL, OPTION_GDWARF_SECTIONS} + ,{"gdwarf-cie-version", required_argument, NULL, OPTION_GDWARF_CIE_VERSION} ,{"gen-debug", no_argument, NULL, 'g'} ,{"gstabs", no_argument, NULL, OPTION_GSTABS} ,{"gstabs+", no_argument, NULL, OPTION_GSTABS_PLUS} @@ -828,6 +835,16 @@ This program has absolutely no warranty.\n")); flag_dwarf_sections = TRUE; break; + case OPTION_GDWARF_CIE_VERSION: + flag_dwarf_cie_version = atoi (optarg); + /* The available CIE versions are 1 (DWARF 2), 3 (DWARF 3), and 4 + (DWARF 4 and 5). */ + if (flag_dwarf_cie_version < 1 + || flag_dwarf_cie_version == 2 + || flag_dwarf_cie_version > 4) + as_fatal (_("Invalid --gdwarf-cie-version `%s'"), optarg); + break; + case 'J': flag_signed_overflow_ok = 1; break; |