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Support using llvm-libunwind

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This commit adds support for using llvm-libunwind for kernels built
using llvm and clang. The two differences are that the largest register
index is given by _LIBUNWIND_HIGHEST_DWARF_REGISTER, we need to check
whether the register is a floating point register and the prototype
for unw_regname takes the unwind cursor as the first argument.

Reviewed-by: Rob Norris <robn@despairlabs.com>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Signed-off-by: Sebastian Pauka <me@spauka.se>
Closes #17230
This commit is contained in:
Sebastian Pauka
2025-04-25 03:58:48 +10:00
committed by GitHub
parent 7031a48c70
commit 1b4826b9a2
2 changed files with 65 additions and 17 deletions
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config/user-libunwind.m4
+16
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@@ -34,6 +34,22 @@ AC_DEFUN([ZFS_AC_CONFIG_USER_LIBUNWIND], [
], [
AC_MSG_RESULT([no])
])
dnl LLVM includes it's own libunwind library, which
dnl defines the highest numbered register in a different
dnl way, and has an incompatible unw_resname function.
AC_MSG_CHECKING([whether libunwind is llvm libunwind])
AC_COMPILE_IFELSE([
AC_LANG_PROGRAM([
#include <libunwind.h>
#if !defined(_LIBUNWIND_HIGHEST_DWARF_REGISTER)
#error "_LIBUNWIND_HIGHEST_DWARF_REGISTER is not defined"
#endif
], [])], [
AC_MSG_RESULT([yes])
AC_DEFINE(IS_LIBUNWIND_LLVM, 1, [libunwind is llvm libunwind])
], [
AC_MSG_RESULT([no])
])
AX_RESTORE_FLAGS
], [
AS_IF([test "x$with_libunwind" = "xyes"], [