[all-commits] [llvm/llvm-project] 0cd794: [llvm-dwarfdump] Fix parsing DW_CFA_AARCH64_negate...

[Igor Kudrin via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 0cd7942c7f7a6f0c8a749c5f0d6d758e0a6fd9d9
      https://github.com/llvm/llvm-project/commit/0cd7942c7f7a6f0c8a749c5f0d6d758e0a6fd9d9
  Author: Igor Kudrin <ikudrin at accesssoftek.com>
  Date:   2024-03-08 (Fri, 08 Mar 2024)

  Changed paths:
    M llvm/lib/DebugInfo/DWARF/DWARFDebugFrame.cpp
    M llvm/test/CodeGen/AArch64/sign-return-address-cfi-negate-ra-state.ll

  Log Message:
  -----------
  [llvm-dwarfdump] Fix parsing DW_CFA_AARCH64_negate_ra_state (#84128)

The saved state of the AARCH64_DWARF_PAUTH_RA_STATE register was not
updated, so `llvm-dwarfdump` continued to dump it as `reg34=1` even if
the correct value is `0`:

```
> llvm-dwarfdump -v test.o
...
0000002c 00000024 00000030 FDE cie=00000000 pc=00000030...00000064
  Format:       DWARF32
  DW_CFA_advance_loc: 4
  DW_CFA_AARCH64_negate_ra_state:
  DW_CFA_advance_loc: 4
  DW_CFA_def_cfa_offset: +16
  DW_CFA_offset: W30 -16
  DW_CFA_remember_state:
  DW_CFA_advance_loc: 16
  DW_CFA_def_cfa_offset: +0
  DW_CFA_advance_loc: 4
  DW_CFA_AARCH64_negate_ra_state:
  DW_CFA_restore: W30
  DW_CFA_advance_loc: 4
  DW_CFA_restore_state:
  DW_CFA_advance_loc: 12
  DW_CFA_def_cfa_offset: +0
  DW_CFA_advance_loc: 4
  DW_CFA_AARCH64_negate_ra_state:
  DW_CFA_restore: W30
  DW_CFA_nop:

  0x30: CFA=WSP
  0x34: CFA=WSP: reg34=1
  0x38: CFA=WSP+16: W30=[CFA-16], reg34=1
  0x48: CFA=WSP: W30=[CFA-16], reg34=1
  0x4c: CFA=WSP: reg34=1               <--- should be '=0'
  0x50: CFA=WSP+16: W30=[CFA-16], reg34=1
  0x5c: CFA=WSP: W30=[CFA-16], reg34=1
  0x60: CFA=WSP: reg34=1               <--- should be '=0'
```



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