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Series |
Synthesize CFI for hand-written asm
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Message
Indu Bhagat
Jan. 3, 2024, 7:15 a.m. UTC
Hello, This patch series adds support in GAS to synthesize CFI for hand-written asm, acronym'd as SCFI. Previous postings: - 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) I have addresssed the two main concerns with V3 and created the V4 series: - The x86 backend must detect the cases when SCFI cannot be done correctly and bail out, e.g., in case of new additions to the ISA or unhandled instructions. - Build failure with --target=x86_64-w64-mingw32 To aid the review process, each patch has a short summary of changes from V2->V3, and from V3->V4. 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 (14): 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[=all,none] gas: scfidw2gen: new functionality to prepare for SCFI 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 i386-reg.tbl: Add a comment to reflect dependency on ordering gas: testsuite: add a x86_64 testsuite for SCFI gas/NEWS: announce the new SCFI command line option gas/Makefile.am | 6 + gas/Makefile.in | 18 +- gas/NEWS | 2 + gas/as.c | 29 +- gas/as.h | 8 + gas/config/obj-elf.c | 16 + gas/config/tc-i386.c | 996 ++ gas/config/tc-i386.h | 21 + gas/doc/as.texi | 28 +- gas/dw2gencfi.c | 45 +- gas/dw2gencfi.h | 20 + gas/ginsn.c | 1259 ++ gas/ginsn.h | 384 + gas/listing.h | 1 + gas/read.c | 29 +- gas/scfi.c | 1232 ++ gas/scfi.h | 38 + gas/scfidw2gen.c | 272 + gas/scfidw2gen.h | 35 + gas/subsegs.c | 1 + gas/subsegs.h | 2 + gas/symbols.c | 3 + gas/testsuite/gas/scfi/README | 17 + gas/testsuite/gas/scfi/x86_64/ginsn-add-1.l | 47 + gas/testsuite/gas/scfi/x86_64/ginsn-add-1.s | 26 + .../gas/scfi/x86_64/ginsn-dw2-regnum-1.l | 55 + .../gas/scfi/x86_64/ginsn-dw2-regnum-1.s | 28 + gas/testsuite/gas/scfi/x86_64/ginsn-pop-1.l | 30 + gas/testsuite/gas/scfi/x86_64/ginsn-pop-1.s | 13 + gas/testsuite/gas/scfi/x86_64/ginsn-push-1.l | 33 + gas/testsuite/gas/scfi/x86_64/ginsn-push-1.s | 14 + gas/testsuite/gas/scfi/x86_64/scfi-add-1.d | 26 + gas/testsuite/gas/scfi/x86_64/scfi-add-1.l | 2 + gas/testsuite/gas/scfi/x86_64/scfi-add-1.s | 13 + gas/testsuite/gas/scfi/x86_64/scfi-add-2.d | 37 + gas/testsuite/gas/scfi/x86_64/scfi-add-2.l | 2 + 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