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This patch adds support for unwinding frames that use the SVE pseudo VG register. We want this register to act like a normal register if the CFI explicitly sets it, but want to provide a default value otherwise. Computing the default value requires an SVE target, so we only want to compute it on demand. aarch64_vg uses a hard-coded .inst in order to avoid a build dependency on binutils 2.28 or later. 2018-01-13 Richard Sandiford <richard.sandiford@linaro.org> gcc/ * doc/tm.texi.in (DWARF_LAZY_REGISTER_VALUE): Document. * doc/tm.texi: Regenerate. libgcc/ * config/aarch64/value-unwind.h (aarch64_vg): New function. (DWARF_LAZY_REGISTER_VALUE): Define. * unwind-dw2.c (_Unwind_GetGR): Use DWARF_LAZY_REGISTER_VALUE to provide a fallback register value. gcc/testsuite/ * g++.target/aarch64/sve/aarch64-sve.exp: New harness. * g++.target/aarch64/sve/catch_1.C: New test. * g++.target/aarch64/sve/catch_2.C: Likewise. * g++.target/aarch64/sve/catch_3.C: Likewise. * g++.target/aarch64/sve/catch_4.C: Likewise. * g++.target/aarch64/sve/catch_5.C: Likewise. * g++.target/aarch64/sve/catch_6.C: Likewise. Reviewed-by: James Greenhalgh <james.greenhalgh@arm.com> From-SVN: r256615
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