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tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,KAM_NUMSUBJECT,RCVD_IN_MSPIKE_H4,RCVD_IN_MSPIKE_WL,SPF_HELO_NONE,SPF_NONE,TXREP autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: Hello, This patch series extends GAS support for SCFI to aarch64. Since Binutils 2.42, GAS has experimental support for synthesizing CFI (SCFI) for hand-written asm for the x86 backend. This is invoked via --scfi=experimental on the hand-written asm. SCFI aims to relieve users from the overhead of writing and maintaining CFI directives in hand-written asm. One of the ways of hardening the SCFI feature in GAS is to extend support to another major architecture. This would also allow exercising SCFI on more workloads. Background ----------- Some background notes on SCFI are present on the wiki https://sourceware.org/binutils/wiki/gas/SCFI. I will refrain from repeating some of that content here for sake of brevity. Additionally, the commit log for the first commit which added the support on x86 may also be helpful in reviewing this series. - gas: x86: synthesize CFI for hand-written asm c7defc5386cc53a4abbb7c53a924cdac3f16aa33 For synthesizing (DWARF) CFI, the SCFI machinery requires the programmer to adhere to some pre-requisites for their asm: - Hand-written asm block must begin with a .type foo, %function It is highly recommended to, additionally, also ensure that: - Hand-written asm block ends with a .size foo, .-foo ginsns, SCFI constraints, etc. ------------------------------ ginsn is an acronym for generic GAS instruction. This is intended to be architecture-neutral abstraction that can be used to convey and keep semantic information about machine instructions in an arch-neutral way in GAS. ginsn specification and associated interfaces can be seen in gas/ginsn.c and gas/ginsn.h. The SCFI algorithm itself is implemented as a couple of passes. The following is a gross over-simplification of the overall process; simplified to hopefully aid the review process: - Create the GCFG (control flow graph) of the ginsns. - Process each basic block and make a note of how each instruction changes the SCFI state (CFA, callee-saved registers, RA). This is done via two passes: forward_flow_scfi_state () and backward_flow_scfi_state (). - Translate SCFI ops to equivalent DWARF CFI ops or directives. The above is implemented in gas/scfi.h and gas/scfi.c. Also see the gas/scfidw2gen.h and gas/scfidw2gen.c where SCFI ops are processed to finally create the DWARF CFI directives. Lastly, I think stating some specifics of SCFI core algorithm itself may be helpful for the review process: Basically the SCFI machinery encodes some rules specified in the standard ABI calling convention (e.g., set of callee-saved registers, how the return address is managed etc). Apart from the rules, the SCFI machinery employs some heuristics. Few examples of heuristics: - The base register for CFA tracking may be either REG_SP or REG_FP. - If the base register for CFA tracking is REG_SP, the precise amount of stack usage (and hence, the value of REG_SP) must be known at all times. - If using dynamic stack allocation, the function must switch to FP-based CFA. This means using instructions like the following (in AMD64) in prologue: pushq %rbp movq %rsp, %rbp and analogous instructions in epilogue. In case of aarch64, this simply means creation of the frame record. - Save and Restore of callee-saved registers must be symmetrical. However, the SCFI machinery at this time only warns if any such asymmetry is seen. These heuristics/rules are architecture-independent and are meant to employed for all architectures/ABIs using SCFI in the future. The SCFI paper published sometime ago (https://sourceware.org/pipermail/binutils/2023-September/129558.html) may be a useful resource to get additional understanding of the above. Known limitations ----------------- These are planned to be worked on in the near future: - The current SCFI machinery does not currently synthesize the PAC-related aarch64-specific CFI directives: .cfi_b_key_frame. Other opcodes used when pointer authentication is enabled also need to be handled (braa, brab, retaa, etc.). - Supporting the following pattern: mov x16,4266 add sp, x16, sp ... - Not a limitation per se, but a note that ATM, that predicated insns are skipped from ginsn translation. IIUC, these instructions are not such that can be used alongside stack management ops. To be double-checked. Thanks, Indu Bhagat (2): gas: aarch64: add experimental support for SCFI gas: aarch64: testsuite: add new tests for SCFI gas/config/tc-aarch64.c | 744 ++++++++++++++++++ gas/config/tc-aarch64.h | 20 + gas/testsuite/gas/scfi/README | 2 +- gas/testsuite/gas/scfi/aarch64/ginsn-cofi-1.l | 30 + gas/testsuite/gas/scfi/aarch64/ginsn-cofi-1.s | 16 + gas/testsuite/gas/scfi/aarch64/ginsn-ldst-1.l | 40 + gas/testsuite/gas/scfi/aarch64/ginsn-ldst-1.s | 21 + gas/testsuite/gas/scfi/aarch64/ginsn-misc-1.l | 32 + gas/testsuite/gas/scfi/aarch64/ginsn-misc-1.s | 15 + .../gas/scfi/aarch64/scfi-aarch64.exp | 60 ++ gas/testsuite/gas/scfi/aarch64/scfi-cb-1.d | 20 + gas/testsuite/gas/scfi/aarch64/scfi-cb-1.l | 2 + gas/testsuite/gas/scfi/aarch64/scfi-cb-1.s | 14 + gas/testsuite/gas/scfi/aarch64/scfi-cfg-1.d | 31 + gas/testsuite/gas/scfi/aarch64/scfi-cfg-1.l | 2 + gas/testsuite/gas/scfi/aarch64/scfi-cfg-1.s | 46 ++ gas/testsuite/gas/scfi/aarch64/scfi-cfg-2.d | 40 + gas/testsuite/gas/scfi/aarch64/scfi-cfg-2.l | 2 + gas/testsuite/gas/scfi/aarch64/scfi-cfg-2.s | 42 + gas/testsuite/gas/scfi/aarch64/scfi-cfg-3.d | 32 + gas/testsuite/gas/scfi/aarch64/scfi-cfg-3.l | 2 + gas/testsuite/gas/scfi/aarch64/scfi-cfg-3.s | 34 + .../gas/scfi/aarch64/scfi-cond-br-1.d | 20 + .../gas/scfi/aarch64/scfi-cond-br-1.l | 2 + .../gas/scfi/aarch64/scfi-cond-br-1.s | 13 + gas/testsuite/gas/scfi/aarch64/scfi-diag-1.l | 2 + gas/testsuite/gas/scfi/aarch64/scfi-diag-1.s | 6 + gas/testsuite/gas/scfi/aarch64/scfi-diag-2.l | 3 + gas/testsuite/gas/scfi/aarch64/scfi-diag-2.s | 25 + gas/testsuite/gas/scfi/aarch64/scfi-ldrp-1.d | 59 ++ gas/testsuite/gas/scfi/aarch64/scfi-ldrp-1.l | 2 + gas/testsuite/gas/scfi/aarch64/scfi-ldrp-1.s | 52 ++ gas/testsuite/gas/scfi/aarch64/scfi-ldrp-2.d | 33 + gas/testsuite/gas/scfi/aarch64/scfi-ldrp-2.l | 2 + gas/testsuite/gas/scfi/aarch64/scfi-ldrp-2.s | 26 + gas/testsuite/gas/scfi/aarch64/scfi-strp-1.d | 39 + gas/testsuite/gas/scfi/aarch64/scfi-strp-1.l | 2 + gas/testsuite/gas/scfi/aarch64/scfi-strp-1.s | 37 + gas/testsuite/gas/scfi/aarch64/scfi-strp-2.d | 35 + gas/testsuite/gas/scfi/aarch64/scfi-strp-2.l | 2 + gas/testsuite/gas/scfi/aarch64/scfi-strp-2.s | 30 + .../gas/scfi/aarch64/scfi-unsupported-1.l | 4 + .../gas/scfi/aarch64/scfi-unsupported-1.s | 31 + 43 files changed, 1671 insertions(+), 1 deletion(-) create mode 100644 gas/testsuite/gas/scfi/aarch64/ginsn-cofi-1.l create mode 100644 gas/testsuite/gas/scfi/aarch64/ginsn-cofi-1.s create mode 100644 gas/testsuite/gas/scfi/aarch64/ginsn-ldst-1.l create mode 100644 gas/testsuite/gas/scfi/aarch64/ginsn-ldst-1.s create mode 100644 gas/testsuite/gas/scfi/aarch64/ginsn-misc-1.l create mode 100644 gas/testsuite/gas/scfi/aarch64/ginsn-misc-1.s create mode 100644 gas/testsuite/gas/scfi/aarch64/scfi-aarch64.exp create mode 100644 gas/testsuite/gas/scfi/aarch64/scfi-cb-1.d create mode 100644 gas/testsuite/gas/scfi/aarch64/scfi-cb-1.l create mode 100644 gas/testsuite/gas/scfi/aarch64/scfi-cb-1.s create mode 100644 gas/testsuite/gas/scfi/aarch64/scfi-cfg-1.d create mode 100644 gas/testsuite/gas/scfi/aarch64/scfi-cfg-1.l create mode 100644 gas/testsuite/gas/scfi/aarch64/scfi-cfg-1.s create mode 100644 gas/testsuite/gas/scfi/aarch64/scfi-cfg-2.d create mode 100644 gas/testsuite/gas/scfi/aarch64/scfi-cfg-2.l create mode 100644 gas/testsuite/gas/scfi/aarch64/scfi-cfg-2.s create mode 100644 gas/testsuite/gas/scfi/aarch64/scfi-cfg-3.d create mode 100644 gas/testsuite/gas/scfi/aarch64/scfi-cfg-3.l create mode 100644 gas/testsuite/gas/scfi/aarch64/scfi-cfg-3.s create mode 100644 gas/testsuite/gas/scfi/aarch64/scfi-cond-br-1.d create mode 100644 gas/testsuite/gas/scfi/aarch64/scfi-cond-br-1.l create mode 100644 gas/testsuite/gas/scfi/aarch64/scfi-cond-br-1.s create mode 100644 gas/testsuite/gas/scfi/aarch64/scfi-diag-1.l create mode 100644 gas/testsuite/gas/scfi/aarch64/scfi-diag-1.s create mode 100644 gas/testsuite/gas/scfi/aarch64/scfi-diag-2.l create mode 100644 gas/testsuite/gas/scfi/aarch64/scfi-diag-2.s create mode 100644 gas/testsuite/gas/scfi/aarch64/scfi-ldrp-1.d create mode 100644 gas/testsuite/gas/scfi/aarch64/scfi-ldrp-1.l create mode 100644 gas/testsuite/gas/scfi/aarch64/scfi-ldrp-1.s create mode 100644 gas/testsuite/gas/scfi/aarch64/scfi-ldrp-2.d create mode 100644 gas/testsuite/gas/scfi/aarch64/scfi-ldrp-2.l create mode 100644 gas/testsuite/gas/scfi/aarch64/scfi-ldrp-2.s create mode 100644 gas/testsuite/gas/scfi/aarch64/scfi-strp-1.d create mode 100644 gas/testsuite/gas/scfi/aarch64/scfi-strp-1.l create mode 100644 gas/testsuite/gas/scfi/aarch64/scfi-strp-1.s create mode 100644 gas/testsuite/gas/scfi/aarch64/scfi-strp-2.d create mode 100644 gas/testsuite/gas/scfi/aarch64/scfi-strp-2.l create mode 100644 gas/testsuite/gas/scfi/aarch64/scfi-strp-2.s create mode 100644 gas/testsuite/gas/scfi/aarch64/scfi-unsupported-1.l create mode 100644 gas/testsuite/gas/scfi/aarch64/scfi-unsupported-1.s -- 2.43.0