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| author | Luke Cheeseman <luke.cheeseman@arm.com> | 2018-09-24 15:55:35 +0000 |
|---|---|---|
| committer | Luke Cheeseman <luke.cheeseman@arm.com> | 2018-09-24 15:55:35 +0000 |
| commit | 8284b19c76a7bafdf4e53b3deb6cd35fcd370e92 (patch) | |
| tree | 591a63cfc1252ed5c2339baf8b95aedf85097350 /libunwind/src/DwarfParser.hpp | |
| parent | 3cb18346d776cc61da0bc5ea41e4678c1851db68 (diff) | |
| download | bcm5719-llvm-8284b19c76a7bafdf4e53b3deb6cd35fcd370e92.tar.gz bcm5719-llvm-8284b19c76a7bafdf4e53b3deb6cd35fcd370e92.zip | |
[AArch64] Unwinding support for return address signing
- When return address signing is enabled, the LR may be signed on function entry
- When an exception is thrown the return address is inspected used to unwind the call stack
- Before this happens, the return address must be correctly authenticated to avoid causing an abort by dereferencing the signed pointer
Differential Revision: https://reviews.llvm.org/D51432
llvm-svn: 342895
Diffstat (limited to 'libunwind/src/DwarfParser.hpp')
| -rw-r--r-- | libunwind/src/DwarfParser.hpp | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/libunwind/src/DwarfParser.hpp b/libunwind/src/DwarfParser.hpp index b749b7776e1..68506a35053 100644 --- a/libunwind/src/DwarfParser.hpp +++ b/libunwind/src/DwarfParser.hpp @@ -666,6 +666,14 @@ bool CFI_Parser<A>::parseInstructions(A &addressSpace, pint_t instructions, _LIBUNWIND_TRACE_DWARF( "DW_CFA_GNU_negative_offset_extended(%" PRId64 ")\n", offset); break; + +#if defined(_LIBUNWIND_TARGET_AARCH64) + case DW_CFA_AARCH64_negate_ra_state: + results->savedRegisters[UNW_ARM64_RA_SIGN_STATE].value ^= 0x1; + _LIBUNWIND_TRACE_DWARF("DW_CFA_AARCH64_negate_ra_state\n"); + break; +#endif + default: operand = opcode & 0x3F; switch (opcode & 0xC0) { |
