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The V2 series fixes the issue, and adds a new patch from V1: - [PATCH, V2 08/10] gas: doc: update documentation for the new listing option I have updated the patches in user branch users/ibhagat/try-scfi-v2. Thanks Indu ------------------------------------------------------- This patch series adds support in GAS to synthesize CFI for hand-written asm, acronym'd as SCFI. The RFC patch series were sent earlier (https://sourceware.org/pipermail/binutils/2023-September/129560.html). I have addressed the review comments, tested the implementation further and created the V2 series here. If you prefer to try out the code etc., the implementation is also available in the branch users/ibhagat/try-scfi-v2. Each patch in this series has notes on how it has evolved since the RFC posting, but here is a brief summary: - Updated some documentation stubs. - ginsn are now emitted in the listing output by using the flag -i. - GAS now warns once per file if there are CFI directives embedded in the user input of asm. The warning message is: "Warning: --scfi=all ignores some user-specified CFI directives" - A distinct set of pseudo_typeS are now defined in scfidwgen.c to handle (i.e. ignore most of) the .cfi_* directives when --scfi is in effect. Handling of .cfi_sections is TBD. - Bug fixes and other improvements. - Beginning of a asm block is identified with a .type foo, @function. If the user does not close the block with a .size foo, .-foo, the asm block is assumed to continue until the next .type bar, @function directive. The testcases scfi-asm-marker-* should be helpful. 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. 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 (10): 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: add new command line option --scfi[=all,none] gas: scfidw2gen: new functionality to prepapre for SCFI gas: synthesize CFI for hand-written asm gas: doc: update documentation for the new listing option gas: testsuite: add a x86_64 testsuite for SCFI gas/NEWS: announce the new command line option gas/Makefile.am | 6 + gas/Makefile.in | 18 +- gas/NEWS | 2 + gas/as.c | 27 +- gas/as.h | 8 + gas/config/obj-elf.c | 16 + gas/config/tc-i386.c | 735 +++++++++- gas/config/tc-i386.h | 21 + gas/doc/as.texi | 28 +- gas/dw2gencfi.c | 42 +- gas/dw2gencfi.h | 14 + gas/ginsn.c | 1225 +++++++++++++++++ gas/ginsn.h | 392 ++++++ gas/listing.h | 1 + gas/read.c | 21 +- gas/scfi.c | 1222 ++++++++++++++++ gas/scfi.h | 38 + gas/scfidw2gen.c | 325 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