llvmorg-github-actions[bot] wrote:
<!--LLVM PR SUMMARY COMMENT--> @llvm/pr-subscribers-libunwind Author: Jon Roelofs (jroelofs) <details> <summary>Changes</summary> The Arm DWARF spec defines UNW_AARCH64_RA_SIGN_STATE as being zeroed until the first .cfi_negate_ra_state / .cfi_set_ra_state [1]. The GPRs struct containing __ra_sign_state is memcpy'd directly from the unw_context_t, which in turn is initialized by __unw_getcontext. Since it is a pseudo register, there is no corresponding state to restore in __unw_resume. https://github.com/ARM-software/abi-aa/blob/main/aadwarf64/aadwarf64.rst#<!-- -->44call-frame-instructions --- Full diff: https://github.com/llvm/llvm-project/pull/205152.diff 1 Files Affected: - (modified) libunwind/src/UnwindRegistersSave.S (+1) ``````````diff diff --git a/libunwind/src/UnwindRegistersSave.S b/libunwind/src/UnwindRegistersSave.S index ca9a97b18e764..a82ebd1ead23b 100644 --- a/libunwind/src/UnwindRegistersSave.S +++ b/libunwind/src/UnwindRegistersSave.S @@ -807,6 +807,7 @@ DEFINE_LIBUNWIND_FUNCTION(__unw_getcontext) mov x1,sp str x1, [x0, #0x0F8] str x30, [x0, #0x100] // store return address as pc + str xzr, [x0, #0x108] // zero __ra_sign_state // skip cpsr #if defined(__ARM_FP) && __ARM_FP != 0 stp d0, d1, [x0, #0x110] `````````` </details> https://github.com/llvm/llvm-project/pull/205152 _______________________________________________ cfe-commits mailing list [email protected] https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
