From ad9bd833d48cd56697406f82ff2769a6a1dc5db7 Mon Sep 17 00:00:00 2001 From: Indu Bhagat Date: Mon, 15 Jan 2024 01:00:13 -0800 Subject: gas: add new command line option --scfi=experimental When the command line option --scfi=experimenta is passed to the GNU assembler, it will synthesize DWARF call frame information (CFI) for the input assembly. The option --scfi=experimental will also ignore most of the existing .cfi_* directives, if already contained in the provided input file. Only the following CFI directives will not be ignored: - .cfi_sections, - .cfi_label, - .cfi_signal_frame To use SCFI, a target will need to: - define TARGET_USE_SCFI and TARGET_USE_GINSN, and other necessary definitions, - provide means to help GAS understand the target specific instruction semantics by creating ginsns. The upcoming support for SCFI is inteded to be experimental, hence the option --scfi=experimental. The --scfi= may see more options like --scfi=[all,none] added in future, once the SCFI support in GAS is mature and robust. The offering may also see for example, an --scfi=inline option for dealing with inline asm may be added in the future. In --scfi=inline option, the GNU assembler may consume (and not ignore) the compiler generated CFI for the code surrounding the inline asm. Also document the option. gas/ * as.c (show_usage): Add support for --scfi=experimental. (parse_args): Likewise. * as.h (enum synth_cfi_type): Define new type. * doc/as.texi: Document the new option. --- gas/as.h | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'gas/as.h') diff --git a/gas/as.h b/gas/as.h index 1297e3d..69d7ae2 100644 --- a/gas/as.h +++ b/gas/as.h @@ -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; -- cgit v1.1