forked from OSchip/llvm-project
41a9e53500
- When signing return addresses with -msign-return-address=<scope>{+<key>},
either the A key instructions or the B key instructions can be used. To
correctly authenticate the return address, the unwinder/debugger must know
which key was used to sign the return address.
- When and exception is thrown or a break point reached, it may be necessary to
unwind the stack. To accomplish this, the unwinder/debugger must be able to
first authenticate an the return address if it has been signed.
- To enable this, the augmentation string of CIEs has been extended to allow
inclusion of a 'B' character. Functions that are signed using the B key
variant of the instructions should have and FDE whose associated CIE has a 'B'
in the augmentation string.
- One must also be able to preserve these semantics when first stepping from a
high level language into assembly and then, as a second step, into an object
file. To achieve this, I have introduced a new assembly directive
'.cfi_b_key_frame ', that tells the assembler the current frame uses return
address signing with the B key.
- This ensures that the FDE is associated with a CIE that has 'B' in the
augmentation string.
Differential Revision: https://reviews.llvm.org/D51798
llvm-svn: 349895
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| .. | ||
| AArch64 | ||
| AMDGPU | ||
| ARM | ||
| COFF | ||
| Generic | ||
| Inputs | ||
| Lanai | ||
| MIR | ||
| MSP430 | ||
| Mips | ||
| NVPTX | ||
| PDB | ||
| PowerPC | ||
| RISCV | ||
| Sparc | ||
| SystemZ | ||
| WebAssembly | ||
| X86 | ||
| arm-relocs.test | ||
| check-debugify-preserves-analyses.ll | ||
| cross-cu-scope.ll | ||
| debugify-bogus-dbg-value.ll | ||
| debugify-each.ll | ||
| debugify-export.ll | ||
| debugify-report-missing-locs-only.ll | ||
| debugify.ll | ||
| debuglineinfo-macho.test | ||
| debuglineinfo-path.ll | ||
| debuglineinfo.test | ||
| debugmacinfo.test | ||
| dwarfdump-64-bit-dwarf.test | ||
| dwarfdump-accel.test | ||
| dwarfdump-debug-frame-simple.test | ||
| dwarfdump-decompression-corrupt.test | ||
| dwarfdump-decompression-error.test | ||
| dwarfdump-dump-flags.test | ||
| dwarfdump-dump-gdbindex.test | ||
| dwarfdump-dwp.test | ||
| dwarfdump-implicit-const.test | ||
| dwarfdump-invalid-line-table.test | ||
| dwarfdump-invalid.test | ||
| dwarfdump-macho-relocs.test | ||
| dwarfdump-macho-universal.test | ||
| dwarfdump-objc.test | ||
| dwarfdump-pubnames.test | ||
| dwarfdump-ranges.test | ||
| dwarfdump-type-units.test | ||
| dwarfdump-zlib.test | ||
| dwo.ll | ||
| invalid-relocations.test | ||
| llvm-symbolizer-split-dwarf-empty.test | ||
| llvm-symbolizer-split-dwarf-no-skel-address.test | ||
| llvm-symbolizer-tu.test | ||
| llvm-symbolizer-zlib.test | ||
| llvm-symbolizer.test | ||
| macro_link.ll | ||
| member-pointers.o | ||
| missing-abstract-variable.o | ||
| omit-empty.ll | ||
| pr34186.ll | ||
| pr34672.ll | ||
| precomp.test | ||
| skeletoncu.ll | ||
| strip-DIGlobalVariable.ll | ||
| strip-loop-metadata.ll | ||
| strip-module-flags.ll | ||
| typeunit-header.test | ||
| unrolled-loop-remainder.ll | ||