diff options
-rw-r--r-- | gas/as.c | 23 | ||||
-rw-r--r-- | gas/as.h | 8 | ||||
-rw-r--r-- | gas/doc/as.texi | 15 |
3 files changed, 44 insertions, 2 deletions
@@ -321,6 +321,11 @@ Options:\n\ generate GNU Build notes if none are present in the input\n")); fprintf (stream, _("\ --gsframe generate SFrame stack trace information\n")); +# if defined (TARGET_USE_SCFI) && defined (TARGET_USE_GINSN) + fprintf (stream, _("\ + --scfi=experimental Synthesize DWARF CFI for hand-written asm\n\ + (experimental support)\n")); +# endif #endif /* OBJ_ELF */ fprintf (stream, _("\ @@ -511,7 +516,8 @@ parse_args (int * pargc, char *** pargv) OPTION_NOCOMPRESS_DEBUG, OPTION_NO_PAD_SECTIONS, OPTION_MULTIBYTE_HANDLING, /* = STD_BASE + 40 */ - OPTION_SFRAME + OPTION_SFRAME, + OPTION_SCFI /* When you add options here, check that they do not collide with OPTION_MD_BASE. See as.h. */ }; @@ -543,7 +549,10 @@ parse_args (int * pargc, char *** pargv) ,{"sectname-subst", no_argument, NULL, OPTION_SECTNAME_SUBST} ,{"generate-missing-build-notes", required_argument, NULL, OPTION_ELF_BUILD_NOTES} ,{"gsframe", no_argument, NULL, OPTION_SFRAME} -#endif +# if defined (TARGET_USE_SCFI) && defined (TARGET_USE_GINSN) + ,{"scfi", required_argument, NULL, OPTION_SCFI} +# endif +#endif /* OBJ_ELF || OBJ_MAYBE_ELF. */ ,{"fatal-warnings", no_argument, NULL, OPTION_WARN_FATAL} ,{"gdwarf-2", no_argument, NULL, OPTION_GDWARF_2} ,{"gdwarf-3", no_argument, NULL, OPTION_GDWARF_3} @@ -982,6 +991,16 @@ This program has absolutely no warranty.\n")); flag_execstack = 0; break; +# if defined (TARGET_USE_SCFI) && defined (TARGET_USE_GINSN) + case OPTION_SCFI: + if (optarg && strcasecmp (optarg, "experimental") == 0) + flag_synth_cfi = SYNTH_CFI_EXPERIMENTAL; + else + as_fatal (_("Invalid --scfi= option: `%s'; suggested option: experimental"), + optarg); + break; +# endif + case OPTION_SIZE_CHECK: if (strcasecmp (optarg, "error") == 0) flag_allow_nonconst_size = false; @@ -324,6 +324,14 @@ COMMON int flag_fatal_warnings; /* --fatal-warnings */ are detected. */ COMMON unsigned char flag_always_generate_output; /* -Z */ +enum synth_cfi_type +{ + SYNTH_CFI_NONE = 0, + SYNTH_CFI_EXPERIMENTAL, +}; + +COMMON enum synth_cfi_type flag_synth_cfi; + /* This is true if the assembler should output time and space usage. */ COMMON unsigned char flag_print_statistics; diff --git a/gas/doc/as.texi b/gas/doc/as.texi index 7526b22..370f40f 100644 --- a/gas/doc/as.texi +++ b/gas/doc/as.texi @@ -255,6 +255,7 @@ gcc(1), ld(1), and the Info entries for @file{binutils} and @file{ld}. [@b{--multibyte-handling=[allow|warn|warn-sym-only]}] [@b{--no-pad-sections}] [@b{-o} @var{objfile}] [@b{-R}] + [@b{--scfi=experimental}] [@b{--sectname-subst}] [@b{--size-check=[error|warning]}] [@b{--statistics}] @@ -932,6 +933,20 @@ Ignored. Supported for compatibility with tools that apss the same option to both the assembler and the linker. @ifset ELF +@item --scfi=experimental +This option controls whether the assembler should synthesize CFI for +hand-written input. If the input already contains some synthesizable CFI +directives, the assembler ignores them and emits a warning. Note that +@code{--scfi=experimental} is not intended to be used for compiler-generated +code, including inline assembly. This experimental support is work in +progress. Only System V AMD64 ABI is supported. + +Each input function in assembly must begin with the @code{.type} directive, and +should ideally be closed off using a @code{.size} directive. When using SCFI, +each @code{.type} directive prompts GAS to start a new FDE (a.k.a., Function +Descriptor Entry). This implies that with each @code{.type} directive, a +previous block of instructions, if any, is finalised as a distinct FDE. + @item --sectname-subst Honor substitution sequences in section names. @ifclear man |