e796abb574
Also add a comment to files/patch-libgcc_unwind.inc to remember when it will get obsolete, i.e. once all supported FreeBSD releases include commit 22e564c74eb20e14bd93fd9fdde20e38a29cfcf1. PR: 285711
32 lines
1.3 KiB
HTML
32 lines
1.3 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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This patch will become obsolete once all supported FreeBSD releases
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include commit 22e564c74eb20e14bd93fd9fdde20e38a29cfcf1.
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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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