[libunwind] Add proper support for DWARF unwind on bare metal.
Right now, ARM EHABI unwind on bare metal expects to find the symbols
__exidx_start and __exidx_end defined, and uses those to locate
the EH tables. However, DWARF unwind on bare metal expects to find
dl_iterate_phdr, which, although possible to provide, is inconvenient
and mildly absurd.
This commit provides feature parity with ARM EHABI unwind by looking
for symbols __eh_frame_start, __eh_frame_end, __eh_frame_hdr_start
and __eh_frame_hdr_end, denoting the start and end of the sections
with corresponding names. As far as I know, there is no de jure or
de facto ABI providing any such names, so I chose the obvious ones.
The .eh_frame_hdr support is optional for maximum flexibility and
possible space savings (e.g. if libunwind is only used to provide
backtraces when a device crashes, providing the .eh_frame_hdr, which
is an index for rapid access to EH tables, would be a waste.)
The support for .eh_frame_hdr/DWARF index in the first place is
conditional on defined(_LIBUNWIND_SUPPORT_DWARF_INDEX), although
right now config.h will always define this macro.
The support for DWARF unwind on bare metal has been validated within
the ARTIQ environment[1].
[1]: https://m-labs.hk/artiq/
llvm-svn: 321445
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: dcd93505da2366f49d58946f23a9f0668118917f
diff --git a/src/AddressSpace.hpp b/src/AddressSpace.hpp
index 2be16af..c9312a4 100644
--- a/src/AddressSpace.hpp
+++ b/src/AddressSpace.hpp
@@ -83,6 +83,38 @@
}
#endif
+#elif defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND) && defined(_LIBUNWIND_IS_BAREMETAL)
+
+// When statically linked on bare-metal, the symbols for the EH table are looked
+// up without going through the dynamic loader.
+
+// The following linker script may be used to produce the necessary sections and symbols.
+// Unless the --eh-frame-hdr linker option is provided, the section is not generated
+// and does not take space in the output file.
+//
+// .eh_frame :
+// {
+// __eh_frame_start = .;
+// KEEP(*(.eh_frame))
+// __eh_frame_end = .;
+// }
+//
+// .eh_frame_hdr :
+// {
+// KEEP(*(.eh_frame_hdr))
+// }
+//
+// __eh_frame_hdr_start = SIZEOF(.eh_frame_hdr) > 0 ? ADDR(.eh_frame_hdr) : 0;
+// __eh_frame_hdr_end = SIZEOF(.eh_frame_hdr) > 0 ? . : 0;
+
+extern char __eh_frame_start;
+extern char __eh_frame_end;
+
+#if defined(_LIBUNWIND_SUPPORT_DWARF_INDEX)
+extern char __eh_frame_hdr_start;
+extern char __eh_frame_hdr_end;
+#endif
+
#elif defined(_LIBUNWIND_ARM_EHABI) && defined(_LIBUNWIND_IS_BAREMETAL)
// When statically linked on bare-metal, the symbols for the EH table are looked
@@ -348,6 +380,20 @@
info.compact_unwind_section_length = dyldInfo.compact_unwind_section_length;
return true;
}
+#elif defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND) && defined(_LIBUNWIND_IS_BAREMETAL)
+ // Bare metal is statically linked, so no need to ask the dynamic loader
+ info.dwarf_section_length = (uintptr_t)(&__eh_frame_end - &__eh_frame_start);
+ info.dwarf_section = (uintptr_t)(&__eh_frame_start);
+ _LIBUNWIND_TRACE_UNWINDING("findUnwindSections: section %X length %x",
+ info.dwarf_section, info.dwarf_section_length);
+#if defined(_LIBUNWIND_SUPPORT_DWARF_INDEX)
+ info.dwarf_index_section = (uintptr_t)(&__eh_frame_hdr_start);
+ info.dwarf_index_section_length = (uintptr_t)(&__eh_frame_hdr_end - &__eh_frame_hdr_start);
+ _LIBUNWIND_TRACE_UNWINDING("findUnwindSections: index section %X length %x",
+ info.dwarf_index_section, info.dwarf_index_section_length);
+#endif
+ if (info.dwarf_section_length)
+ return true;
#elif defined(_LIBUNWIND_ARM_EHABI) && defined(_LIBUNWIND_IS_BAREMETAL)
// Bare metal is statically linked, so no need to ask the dynamic loader
info.arm_section = (uintptr_t)(&__exidx_start);