dwarf_loader: Support DW_TAG_label outside DW_TAG_lexblock
This happens with asm CUs, noticed when building the Linux kernel with
clang 15, where we have, for instance:
Contents of the .debug_info section:
Compilation Unit @ offset 0x0:
Length: 0x1df (32-bit)
Version: 5
Unit Type: DW_UT_compile (1)
Abbrev Offset: 0x0
Pointer Size: 8
<0><c>: Abbrev Number: 1 (DW_TAG_compile_unit)
<d> DW_AT_stmt_list : 0x0
<11> DW_AT_ranges : 0xc
<15> DW_AT_name : arch/x86/kernel/verify_cpu.S
<32> DW_AT_comp_dir : /home/nathan/cbl/src/linux
<4d> DW_AT_producer : ClangBuiltLinux clang version 16.0.0 (https://github.com/llvm/llvm-project 7e22179d38c438fedb0d9bb0cff1585843bd7082)
<c2> DW_AT_language : 32769 (MIPS assembler)
<1><c4>: Abbrev Number: 2 (DW_TAG_label)
<c5> DW_AT_name : startup_64
<d0> DW_AT_decl_file : 0x0
<d4> DW_AT_decl_line : 0x364
<d8> DW_AT_low_pc : 0xffffffff81000000
<1><e0>: Abbrev Number: 2 (DW_TAG_label)
<e1> DW_AT_name : secondary_startup_64
<f6> DW_AT_decl_file : 0x0
<fa> DW_AT_decl_line : 0x399
<fe> DW_AT_low_pc : 0xffffffff81000060
<1><106>: Abbrev Number: 2 (DW_TAG_label)
<107> DW_AT_name : secondary_startup_64_no_verify
<126> DW_AT_decl_file : 0x0
<12a> DW_AT_decl_line : 0x39f
<12e> DW_AT_low_pc : 0xffffffff81000065
<1><136>: Abbrev Number: 2 (DW_TAG_label)
<137> DW_AT_name : verify_cpu
<142> DW_AT_decl_file : 0x0
<146> DW_AT_decl_line : 0x430
<14a> DW_AT_low_pc : 0xffffffff81000150
<SNIP>
Bug: 261824655
Reported-by: Nathan Chancellor <nathan@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/dwarves/YzWSzXKcm6rSWOC5@kernel.org
Change-Id: Iefa1632a9307b57e11ca7f6a59bf86fd7b8cfd71
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
1 file changed
