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In the current V5 version, I have addressed many of the review comments. If this version looks OK to you, I like this to be merged for the upcoming 2.42 release. The current SCFI support is experimental; Work will need to continue to make SCFI a more mature and robust offering. Thanks for reviewing the previous versions: - RFC patch series (https://sourceware.org/pipermail/binutils/2023-September/129560.html). - V1 (https://sourceware.org/pipermail/binutils/2023-October/130163.html) - V2 (https://sourceware.org/pipermail/binutils/2023-October/130210.html) - V3 (https://sourceware.org/pipermail/binutils/2023-December/131079.html) - V4 (https://sourceware.org/pipermail/binutils/2024-January/131521.html) To aid the review process, each patch has a short summary of changes from V2->V3, from V3->V4, and now from V4->V5. Following are the most significant ones: - After consensus to merge this feature as experimental, the command line option has been changed to --scfi=experimental. - Fixed several cases of incorrect, insufficient or confusing code in tc-i386.c. Some work items for future include: - Allow APX instructions. - Handle 8-bit, 16-bit, 32-bit MOV and ALU ops correctly. - User-interfacing documentation around best-practices to use SCFI. - Other minor items We will create a bugzilla entry for each and handle them over the coming weeks. SCFI ------ Motivation for the patch series is to alleviate users from manually adding the CFI directives in hand-written asm. Manually adding CFI annotations to user input asm needs additional expertise; human-errors are possible and indeed occur more often than one may like. These errors, if present at the time of virtual stack unwind, lead to unfavorable outcomes: incorrect stacktraces, program state corruption etc. For synthesis of CFI to work, the user input must adhere to the ABI and the appropriate calling conventions, as GAS derives the set of callee-saved registers based on that contract. Currently, only System V AMD64 ABI is supported. AArch64 support is in the works. The SCFI implementation is based on some heuristics/rules, please see the patch "gas: synthesize CFI for hand-written asm" for more details. Further, at the moment, SCFI does not help in cases when the control flow graph of the input asm cannot be generated (e.g., in case of indirect jumps, jump tables). Thanks, Indu Bhagat (16): gas: dw2gencfi: minor rejig for cfi_sections_set and all_cfi_sections gas: dw2gencfi: use all_cfi_sections instead of cfi_sections gas: dw2gencfi: expose a new cfi_set_last_fde API gas: dw2gencfi: move some tc_* defines to the header file gas: dw2gencfi: expose dot_cfi_sections for scfidw2gen gas: dw2gencfi: externalize the all_cfi_sections gas: add new command line option --scfi=experimental gas: scfidw2gen: new functionality to prepare for SCFI opcodes: i386: fix dw2_regnum data type in reg_entry opcodes: gas: i386: define and use Rex2 as attribute not constraint opcodes: i386: new marker for insns that implicitly update stack pointer gas: synthesize CFI for hand-written asm gas: doc: update documentation for the new listing option opcodes: i386-reg.tbl: Add a comment to reflect dependency on ordering gas: testsuite: add an x86_64 testsuite for SCFI gas/NEWS: announce the new SCFI command line option gas/Makefile.am | 6 + gas/Makefile.in | 18 +- gas/NEWS | 3 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opcodes/i386-reg.tbl | 3 + opcodes/i386-tbl.h | 11755 ++++++++++------ 156 files changed, 15482 insertions(+), 4033 deletions(-) create mode 100644 gas/ginsn.c create mode 100644 gas/ginsn.h create mode 100644 gas/scfi.c create mode 100644 gas/scfi.h create mode 100644 gas/scfidw2gen.c create mode 100644 gas/scfidw2gen.h create mode 100644 gas/testsuite/gas/scfi/README create mode 100644 gas/testsuite/gas/scfi/x86_64/ginsn-add-1.l create mode 100644 gas/testsuite/gas/scfi/x86_64/ginsn-add-1.s create mode 100644 gas/testsuite/gas/scfi/x86_64/ginsn-dw2-regnum-1.l create mode 100644 gas/testsuite/gas/scfi/x86_64/ginsn-dw2-regnum-1.s create mode 100644 gas/testsuite/gas/scfi/x86_64/ginsn-pop-1.l create mode 100644 gas/testsuite/gas/scfi/x86_64/ginsn-pop-1.s create mode 100644 gas/testsuite/gas/scfi/x86_64/ginsn-push-1.l create mode 100644 gas/testsuite/gas/scfi/x86_64/ginsn-push-1.s create mode 100644 gas/testsuite/gas/scfi/x86_64/scfi-add-1.d create mode 100644 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