Who generate .rela.debug_info?
Dear list， tls.c: __thread int i=10; $gcc -g -c -save-temps tls.c $readelf -r tls.o Relocation section '.rela.debug_info' at offset 0x2d0 contains 6 entries: Offset Info Type Sym. ValueSym. Name + Addend 0006 0007000a R_X86_64_32 .debug_abbrev + 0 000c 000a000a R_X86_64_32 .debug_str + 11 0011 000a000a R_X86_64_32 .debug_str + 3f 0015 000a000a R_X86_64_32 .debug_str + 0 0019 0009000a R_X86_64_32 .debug_line + 0 0028 000d0015 R_X86_64_DTPOFF32 i + 0 Relocation section '.rela.debug_aranges' at offset 0x360 contains 1 entries: Offset Info Type Sym. ValueSym. Name + Addend 0006 0006000a R_X86_64_32 .debug_info + 0 I can't find any code in cc1 or as that generate R_X86_64_DTPOFF32 in .rela.debug_info section. Did I miss something? -- Best Regards, Yu Rong Tan
Re: Who generate .rela.debug_info?
> .rela.X is a relocation section generated by the assembler. GCC emits debug > information using assembler pseudos such as .word etc. Those will name > relocations. The syntax for relocations is target-specific. The above will > be some_symbol@dtpoff or something. Sorry, I did not find it in "AS". I did saw .text .data .bss and some other new segment created by "AS" through function "subseg_new", but I could not find out where and how ".rela.debug_info" is generated. For this case, "as" dwarf2dbg.c(binutils-2.29.1): 1932 if(emit_other_sections) does not run (emit_other_section==0). My understand, all .debug_XXX is generated by GCC, "AS" just copy them to obj, not a bit change. But I also could not find ".rela.X" in GCC. Did I miss something? I need a breakpoint to see "Oh it really created it there~" -- Best Regards, Yu Rong Tan
Re: Who generate .rela.debug_info?
>> I can't find any code in cc1 or as that generate R_X86_64_DTPOFF32 in >> .rela.debug_info section. Did I miss something? > > To expand on what Nathan said: the debug info needs to refer to the > location of the variable 'i' somehow, and as it's a TLS variable that > location is thread specific as well, and so the normal data relocations > can't be used. So the dwarf info contains a location expression that uses > this relocation and a GNU extension to push the tls address into the > expression stack. See e.g. the verbose asm output for the above file, the > DIE for 'i' will contain something like this: > > .uleb128 0x2# (DIE (0x1d) DW_TAG_variable) > .ascii "i\0"# DW_AT_name > .byte 0x1 # DW_AT_decl_file (x.c) > .byte 0x1 # DW_AT_decl_line > .long 0x31# DW_AT_type > # DW_AT_external > .uleb128 0xa# DW_AT_location > .byte 0xe # DW_OP_const8u > .long i@dtpoff, 0 > .byte 0xe0# DW_OP_GNU_push_tls_address > > The 'i@dtpoff' is the field that causes the DTPOFF32 relocation to be > created by the assembler. My understand, .debug_info is generated by compiler, and that is quite format, DIE entry, TAG, Attributes DW_AT_location: 10 byte block: e 0 0 0 0 0 0 0 0 e0 (DW_OP_const8u: 0 0; DW_OP_GNU_push_tls_address or DW_OP_HP_unknown) How ".long i@dtpoff, 0" generated in .debug_info??? I mean that is not that format. How it stored in DIE format? Do you mean it not in DIE entry, but in ASM pass adds ".long i@dtpoff, 0" to .s, only store in .s? -- Best Regards, Yu Rong Tan
Re: Who generate .rela.debug_info?
> It's not clear to my why you want this level of detail -- curiosity? I need to enable this feature on open64. Thank you all for your great infos. -- Best Regards, Yu Rong Tan
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