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Compiling GCC with some CPUTYPE values (e.g. broadwell) result in breaking some applications (e.g. math/octave, cad/freecad), sending a SIGBUS. The issue is due to GCC generating instructions that require variables to be aligned in memory on certain CPUs. Our libthr does not have the required alignment so these CPUs fail to execute these instructions. The patch disables the generation of such instructions. PR: 285711 Reported by: cracauer Tested by: cracauer, jbo
28 lines
1.2 KiB
HTML
28 lines
1.2 KiB
HTML
GCC generates instructions that require variables to be aligned in memory on
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certain CPUs. Our libthr does not have the required alignment so these CPUs fail
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to execute these instructions. The instructions generation is driven by CPUTYPE.
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Some CPUs are fine to execute these instructions on unaligned data.
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This patch explicitly forbids GCC to generate instructions that require
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alignment of the data.
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If the entire program is compiled by LLVM or GCC, there is no problem (with GCC
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everything is aligned, with LLVM vmovdqa is not used to assign both variables
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at once).
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Linux does not have libthr, so Linux is not affected. Moreover Linux is likely
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to build everything with GCC.
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--- libgcc/unwind.inc.orig 2025-04-12 08:18:17 UTC
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+++ libgcc/unwind.inc
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@@ -212,8 +212,8 @@ _Unwind_ForcedUnwind (struct _Unwind_Exception *exc,
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uw_init_context (&this_context);
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cur_context = this_context;
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- exc->private_1 = (_Unwind_Ptr) stop;
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- exc->private_2 = (_Unwind_Ptr) stop_argument;
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+ __builtin_memcpy(&exc->private_1, &stop, sizeof(_Unwind_Ptr));
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+ __builtin_memcpy(&exc->private_2, &stop_argument, sizeof(_Unwind_Ptr));
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code = _Unwind_ForcedUnwind_Phase2 (exc, &cur_context, &frames);
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if (code != _URC_INSTALL_CONTEXT)
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