On Wed, May 13, 2015 at 4:50 AM, H.J. Lu <[email protected]> wrote: > On Tue, May 12, 2015 at 5:14 PM, H.J. Lu <[email protected]> wrote: >> On Fri, May 8, 2015 at 1:16 PM, H.J. Lu <[email protected]> wrote: >>> On Fri, May 8, 2015 at 5:09 AM, H.J. Lu <[email protected]> wrote: >>>> On Thu, May 7, 2015 at 8:22 PM, Andy Lutomirski <[email protected]> >>>> wrote: >>>>> On Thu, May 7, 2015 at 9:21 AM, H.J. Lu <[email protected]> wrote: >>>>>> On Thu, May 7, 2015 at 4:52 AM, Jan Beulich <[email protected]> wrote: >>>>>>>>>> On 07.05.15 at 08:02, <[email protected]> wrote: >>>>>>>> AFAICT gas will produce relocations for jumps to global labels in the >>>>>>>> same file. This doesn't seem directly harmful to me, except that, on >>>>>>>> x86, it forces five-byte jumps instead of two-byte jumps. >>>>>>>> >>>>>>>> This seems especially unfortunate, since even hidden and protected >>>>>>>> symbols have this problem. >>>>>>>> >>>>>>>> Given that many users don't want interposition support (especially the >>>>>>>> kernel and anyone using .hidden or .protected), it would be nice to >>>>>>>> have a command-line option to turn this off and probably also to turn >>>>>>>> it off by default for hidden and protected symbols. Can gas do this? >>>>>>> >>>>>>> I've been running with the below changes (taken off of a bigger set >>>>>>> of changes, so the line numbers may look a little odd) for the last >>>>>>> couple of years. I never tried to submit this change because so far >>>>>>> I couldn't find the time to check whether this would have any >>>>>>> unwanted side effects on cases I don't normally use. >>>>>>> >>>>>> >>>>>> This is the patch I checked in. >>>>>> >>>>>> Thanks. >>>>>> >>>>>> -- >>>>>> H.J. >>>>>> --- >>>>>> Branches to global non-weak symbols defined in the same segment with >>>>>> non-default visibility can be optimized the same way as branches to >>>>>> local symbols. >>>>> >>>>> Would it make sense to also add a command line option along the lines >>>>> of gcc's -fno-semantic-interposition or some way to override the >>>>> default visibility? AFAICS this patch helps but only if asm code gets >>>>> liberally sprinkled with .hidden or .protected directives. >>>>> >>>> >>>> This is what I checked in. With >>>> >>>> diff --git a/arch/x86/Makefile b/arch/x86/Makefile >>>> index 2fda005..186e6f7 100644 >>>> --- a/arch/x86/Makefile >>>> +++ b/arch/x86/Makefile >>>> @@ -107,6 +107,10 @@ else >>>> KBUILD_CFLAGS += $(call cc-option,-maccumulate-outgoing-args) >>>> endif >>>> >>>> +NO_SHARED_CFLAGS = $(call as-option,-Wa$(comma)-mno-shared) >>>> +KBUILD_CFLAGS += $(NO_SHARED_CFLAGS) >>>> +KBUILD_AFLAGS += $(NO_SHARED_CFLAGS) >>>> + >>>> # Make sure compiler does not have buggy stack-protector support. >>>> ifdef CONFIG_CC_STACKPROTECTOR >>>> cc_has_sp := $(srctree)/scripts/gcc-x86_$(BITS)-has-stack-protector.sh >>>> >>>> On kernel master branch, I got >>>> >>>> text data bss dec hex filename >>>> 10934167 2275232 1609728 14819127 e21f37 vmlinux.old >>>> 10934119 2275232 1609728 14819079 e21f07 vmlinux >>>> >>>> It saves 48 bytes. >>> >>> This is before I fixed: >>> >>> /* This is global to keep gas from relaxing the jumps */ >>> ENTRY(early_idt_handler) >>> cld >>> >>> in arch/x86/kernel/head_64.S. With -mno-shared, we must >>> make early_idt_handler weak to keep gas from relaxing the jumps. >>> >> >> Here is a patch to change the assembler default to optimize out >> relocations to defined non-weak global branch targets with default >> visibility. It will generate slightly smaller object files. But Linux >> kernel will be broken unless early_idt_handler is marked weak. >> I am little uncomfortable with -mshare and I don't like -mno-shared >> very much either. I may just simply remove -mno-shared. >> > > I reverted the -mno-shared change. >
Here is a patch to add -mshared, which is off by default. On Linux kernel with this change: diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S index a468c0a..9a10e05 100644 --- a/arch/x86/kernel/head_64.S +++ b/arch/x86/kernel/head_64.S @@ -339,8 +339,8 @@ early_idt_handlers: i = i + 1 .endr -/* This is global to keep gas from relaxing the jumps */ -ENTRY(early_idt_handler) +/* This is weak to keep gas from relaxing the jumps */ +WEAK(early_idt_handler) cld cmpl $2,(%rsp) # X86_TRAP_NMI -- 2.1.0 I got [hjl@gnu-tools-1 kernel.org]$ readelf -r old/vmlinux.o | head -5 Relocation section '.rela.text' at offset 0xafea2f0 contains 205717 entries: Offset Info Type Sym. Value Sym. Name + Addend 000000000001 1253100000002 R_X86_64_PC32 0000000000001e70 __fentry__ - 4 000000000009 1c8c00000002 R_X86_64_PC32 0000000000000000 .data + 51bc [hjl@gnu-tools-1 kernel.org]$ readelf -r new/vmlinux.o | head -5 Relocation section '.rela.text' at offset 0xafea280 contains 205711 entries: Offset Info Type Sym. Value Sym. Name + Addend 000000000001 1253100000002 R_X86_64_PC32 0000000000001e70 __fentry__ - 4 000000000009 1c8c00000002 R_X86_64_PC32 0000000000000000 .data + 51bc [hjl@gnu-tools-1 kernel.org]$ It removes 6 relocations. On gcc master branch, [hjl@gnu-tools-1 gcc-misc]$ size build-x86_64-linux*/gcc/cc1 text data bss dec hex filename 21529621 62256 1348312 22940189 15e0a1d build-x86_64-linux.branch/gcc/cc1 21529749 62256 1348312 22940317 15e0a9d build-x86_64-linux/gcc/cc1 [hjl@gnu-tools-1 gcc-misc]$ size build-x86_64-linux*/gcc/cc1plus text data bss dec hex filename 23713509 62400 1372760 25148669 17fbcfd build-x86_64-linux.branch/gcc/cc1plus 23713669 62400 1372760 25148829 17fbd9d build-x86_64-linux/gcc/cc1plus [hjl@gnu-tools-1 gcc-misc]$ It is more effective. I will run more tests. -- H.J.
From cf1509c67f6c2ca0919c60220489e8d10bb4963a Mon Sep 17 00:00:00 2001 From: "H.J. Lu" <[email protected]> Date: Tue, 12 May 2015 16:52:11 -0700 Subject: [PATCH] Add -mshared option to x86 ELF assembler This patch adds -mshared option to x86 ELF assembler. By default, assembler will optimize out relocations to defined non-weak global branch targets with default visibility. The -mshared option tells the assembler to generate code which may go into a shared library where all non-weak global branch targets with default visibility can be preempted. The resulting code is slightly bigger. This option only affects the handling of branch instructions. gas/ * config/tc-i386.c (shared): New. (OPTION_MSHARED): Likewise. (elf_symbol_resolved_in_segment_p): Add relocation argument. Check PLT relocations and shared. (md_estimate_size_before_relax): Pass fragP->fr_var to elf_symbol_resolved_in_segment_p. (md_longopts): Add -mshared. (md_show_usage): Likewise. (md_parse_option): Handle OPTION_MSHARED. * doc/c-i386.texi: Document -mshared. gas/testsuite/ * gas/i386/i386.exp: Run relax-4 and x86-64-relax-3. * gas/i386/pcrel.d: Pass -mshared to assembler. * gas/i386/relax-3.d: Likewise. Updated. * gas/i386/x86-64-relax-2.d: Likewise. * gas/i386/relax-3.s: Add test for PLT relocation. * gas/i386/relax-4.d: New file. * gas/i386/x86-64-relax-3.d: Likewise. --- gas/config/tc-i386.c | 35 ++++++++++++++++++++++++++++++--- gas/doc/c-i386.texi | 11 +++++++++++ gas/testsuite/gas/i386/i386.exp | 2 ++ gas/testsuite/gas/i386/pcrel.d | 1 + gas/testsuite/gas/i386/relax-3.d | 28 ++++++++++++++------------ gas/testsuite/gas/i386/relax-3.s | 1 + gas/testsuite/gas/i386/relax-4.d | 32 ++++++++++++++++++++++++++++++ gas/testsuite/gas/i386/x86-64-relax-2.d | 24 +++++++++++----------- gas/testsuite/gas/i386/x86-64-relax-3.d | 33 +++++++++++++++++++++++++++++++ 9 files changed, 140 insertions(+), 27 deletions(-) create mode 100644 gas/testsuite/gas/i386/relax-4.d create mode 100644 gas/testsuite/gas/i386/x86-64-relax-3.d diff --git a/gas/config/tc-i386.c b/gas/config/tc-i386.c index 75f268f..254548f 100644 --- a/gas/config/tc-i386.c +++ b/gas/config/tc-i386.c @@ -524,6 +524,11 @@ static enum x86_elf_abi x86_elf_abi = I386_ABI; static int use_big_obj = 0; #endif +#if defined (OBJ_ELF) || defined (OBJ_MAYBE_ELF) +/* 1 if generating code for a shared library. */ +static int shared = 0; +#endif + /* 1 for intel syntax, 0 if att syntax. */ static int intel_syntax = 0; @@ -8818,7 +8823,7 @@ i386_frag_max_var (fragS *frag) #if defined (OBJ_ELF) || defined (OBJ_MAYBE_ELF) static int -elf_symbol_resolved_in_segment_p (symbolS *fr_symbol) +elf_symbol_resolved_in_segment_p (symbolS *fr_symbol, offsetT fr_var) { /* STT_GNU_IFUNC symbol must go through PLT. */ if ((symbol_get_bfdsym (fr_symbol)->flags @@ -8829,9 +8834,24 @@ elf_symbol_resolved_in_segment_p (symbolS *fr_symbol) /* Symbol may be weak or local. */ return !S_IS_WEAK (fr_symbol); + /* Global symbols with non-default visibility can't be preempted. */ + if (ELF_ST_VISIBILITY (S_GET_OTHER (fr_symbol)) != STV_DEFAULT) + return 1; + + if (fr_var != NO_RELOC) + switch ((enum bfd_reloc_code_real) fr_var) + { + case BFD_RELOC_386_PLT32: + case BFD_RELOC_X86_64_PLT32: + /* Symbol with PLT relocatin may be preempted. */ + return 0; + default: + abort (); + } + /* Global symbols with default visibility in a shared library may be preempted by another definition. */ - return ELF_ST_VISIBILITY (S_GET_OTHER (fr_symbol)) != STV_DEFAULT; + return !shared; } #endif @@ -8858,7 +8878,8 @@ md_estimate_size_before_relax (fragS *fragP, segT segment) if (S_GET_SEGMENT (fragP->fr_symbol) != segment #if defined (OBJ_ELF) || defined (OBJ_MAYBE_ELF) || (IS_ELF - && !elf_symbol_resolved_in_segment_p (fragP->fr_symbol)) + && !elf_symbol_resolved_in_segment_p (fragP->fr_symbol, + fragP->fr_var)) #endif #if defined (OBJ_COFF) && defined (TE_PE) || (OUTPUT_FLAVOR == bfd_target_coff_flavour @@ -9528,6 +9549,7 @@ const char *md_shortopts = "qn"; #define OPTION_MBIG_OBJ (OPTION_MD_BASE + 18) #define OPTION_OMIT_LOCK_PREFIX (OPTION_MD_BASE + 19) #define OPTION_MEVEXRCIG (OPTION_MD_BASE + 20) +#define OPTION_MSHARED (OPTION_MD_BASE + 21) struct option md_longopts[] = { @@ -9538,6 +9560,7 @@ struct option md_longopts[] = #endif #if defined (OBJ_ELF) || defined (OBJ_MAYBE_ELF) {"x32", no_argument, NULL, OPTION_X32}, + {"mshared", no_argument, NULL, OPTION_MSHARED}, #endif {"divide", no_argument, NULL, OPTION_DIVIDE}, {"march", required_argument, NULL, OPTION_MARCH}, @@ -9598,6 +9621,10 @@ md_parse_option (int c, char *arg) /* -s: On i386 Solaris, this tells the native assembler to use .stab instead of .stab.excl. We always use .stab anyhow. */ break; + + case OPTION_MSHARED: + shared = 1; + break; #endif #if (defined (OBJ_ELF) || defined (OBJ_MAYBE_ELF) \ || defined (TE_PE) || defined (TE_PEP) || defined (OBJ_MACH_O)) @@ -10027,6 +10054,8 @@ md_show_usage (FILE *stream) -mold-gcc support old (<= 2.8.1) versions of gcc\n")); fprintf (stream, _("\ -madd-bnd-prefix add BND prefix for all valid branches\n")); + fprintf (stream, _("\ + -mshared disable branch optimization for shared code\n")); # if defined (TE_PE) || defined (TE_PEP) fprintf (stream, _("\ -mbig-obj generate big object files\n")); diff --git a/gas/doc/c-i386.texi b/gas/doc/c-i386.texi index 1645c8c..a1997f5 100644 --- a/gas/doc/c-i386.texi +++ b/gas/doc/c-i386.texi @@ -298,6 +298,17 @@ The @code{.att_syntax} and @code{.intel_syntax} directives will take precedent. This option forces the assembler to add BND prefix to all branches, even if such prefix was not explicitly specified in the source code. +@cindex @samp{-mshared} option, i386 +@cindex @samp{-mshared} option, x86-64 +@item -mno-shared +On ELF target, the assembler normally optimizes out relocations to +defined non-weak global branch targets with default visibility. The +@samp{-mshared} option tells the assembler to generate code which +may go into a shared library where all non-weak global branch targets +with default visibility can be preempted. The resulting code is +slightly bigger. This option only affects the handling of branch +instructions. + @cindex @samp{-mbig-obj} option, x86-64 @item -mbig-obj On x86-64 PE/COFF target this option forces the use of big object file diff --git a/gas/testsuite/gas/i386/i386.exp b/gas/testsuite/gas/i386/i386.exp index b6f2810..c66dbc5 100644 --- a/gas/testsuite/gas/i386/i386.exp +++ b/gas/testsuite/gas/i386/i386.exp @@ -396,6 +396,7 @@ if [expr ([istarget "i*86-*-*"] || [istarget "x86_64-*-*"]) && [gas_32_check]] run_dump_test "note" run_dump_test "relax-3" + run_dump_test "relax-4" if {![istarget "*-*-nacl*"]} then { run_dump_test "iamcu-1" @@ -763,6 +764,7 @@ if [expr ([istarget "i*86-*-*"] || [istarget "x86_64-*-*"]) && [gas_64_check]] t run_list_test "x86-64-size-inval-1" "-al" run_dump_test "x86-64-relax-2" + run_dump_test "x86-64-relax-3" run_dump_test "x86-64-jump" } diff --git a/gas/testsuite/gas/i386/pcrel.d b/gas/testsuite/gas/i386/pcrel.d index 5b61c23..8a91a1a 100644 --- a/gas/testsuite/gas/i386/pcrel.d +++ b/gas/testsuite/gas/i386/pcrel.d @@ -1,4 +1,5 @@ #objdump: -drw +#as: -mshared #name: i386 pcrel reloc .*: +file format .*i386.* diff --git a/gas/testsuite/gas/i386/relax-3.d b/gas/testsuite/gas/i386/relax-3.d index 8aa94e9..4610553 100644 --- a/gas/testsuite/gas/i386/relax-3.d +++ b/gas/testsuite/gas/i386/relax-3.d @@ -1,3 +1,4 @@ +#as: -mshared #objdump: -dwr .*: +file format .* @@ -5,26 +6,27 @@ Disassembly of section .text: 0+ <foo>: -[ ]*[a-f0-9]+: eb 1f jmp 21 <local> -[ ]*[a-f0-9]+: eb 19 jmp 1d <hidden_def> -[ ]*[a-f0-9]+: e9 fc ff ff ff jmp 5 <foo\+0x5> 5: (R_386_PC)?(DISP)?32 global_def -[ ]*[a-f0-9]+: e9 fc ff ff ff jmp a <foo\+0xa> a: (R_386_PC)?(DISP)?32 weak_def -[ ]*[a-f0-9]+: e9 fc ff ff ff jmp f <foo\+0xf> f: (R_386_PC)?(DISP)?32 weak_hidden_undef -[ ]*[a-f0-9]+: e9 fc ff ff ff jmp 14 <foo\+0x14> 14: (R_386_PC)?(DISP)?32 weak_hidden_def -[ ]*[a-f0-9]+: e9 fc ff ff ff jmp 19 <foo\+0x19> 19: (R_386_PC)?(DISP)?32 hidden_undef - -0+1d <hidden_def>: +[ ]*[a-f0-9]+: eb 24 jmp 26 <local> +[ ]*[a-f0-9]+: eb 1e jmp 22 <hidden_def> +[ ]*[a-f0-9]+: e9 fc ff ff ff jmp 5 <foo\+0x5> 5: R_386_PC32 global_def +[ ]*[a-f0-9]+: e9 fc ff ff ff jmp a <foo\+0xa> a: R_386_PLT32 global_def +[ ]*[a-f0-9]+: e9 fc ff ff ff jmp f <foo\+0xf> f: R_386_PC32 weak_def +[ ]*[a-f0-9]+: e9 fc ff ff ff jmp 14 <foo\+0x14> 14: R_386_PC32 weak_hidden_undef +[ ]*[a-f0-9]+: e9 fc ff ff ff jmp 19 <foo\+0x19> 19: R_386_PC32 weak_hidden_def +[ ]*[a-f0-9]+: e9 fc ff ff ff jmp 1e <foo\+0x1e> 1e: R_386_PC32 hidden_undef + +0+22 <hidden_def>: [ ]*[a-f0-9]+: c3 ret -0+1e <weak_hidden_def>: +0+23 <weak_hidden_def>: [ ]*[a-f0-9]+: c3 ret -0+1f <global_def>: +0+24 <global_def>: [ ]*[a-f0-9]+: c3 ret -0+20 <weak_def>: +0+25 <weak_def>: [ ]*[a-f0-9]+: c3 ret -0+21 <local>: +0+26 <local>: [ ]*[a-f0-9]+: c3 ret #pass diff --git a/gas/testsuite/gas/i386/relax-3.s b/gas/testsuite/gas/i386/relax-3.s index ab52185..48ea917 100644 --- a/gas/testsuite/gas/i386/relax-3.s +++ b/gas/testsuite/gas/i386/relax-3.s @@ -4,6 +4,7 @@ foo: jmp local jmp hidden_def jmp global_def + jmp global_def@PLT jmp weak_def jmp weak_hidden_undef jmp weak_hidden_def diff --git a/gas/testsuite/gas/i386/relax-4.d b/gas/testsuite/gas/i386/relax-4.d new file mode 100644 index 0000000..2039251 --- /dev/null +++ b/gas/testsuite/gas/i386/relax-4.d @@ -0,0 +1,32 @@ +#source: relax-3.s +#objdump: -dwr + +.*: +file format .* + +Disassembly of section .text: + +0+ <foo>: +[ ]*[a-f0-9]+: eb 21 jmp 23 <local> +[ ]*[a-f0-9]+: eb 1b jmp 1f <hidden_def> +[ ]*[a-f0-9]+: eb 1b jmp 21 <global_def> +[ ]*[a-f0-9]+: e9 fc ff ff ff jmp 7 <foo\+0x7> 7: R_386_PLT32 global_def +[ ]*[a-f0-9]+: e9 fc ff ff ff jmp c <foo\+0xc> c: R_386_PC32 weak_def +[ ]*[a-f0-9]+: e9 fc ff ff ff jmp 11 <foo\+0x11> 11: R_386_PC32 weak_hidden_undef +[ ]*[a-f0-9]+: e9 fc ff ff ff jmp 16 <foo\+0x16> 16: R_386_PC32 weak_hidden_def +[ ]*[a-f0-9]+: e9 fc ff ff ff jmp 1b <foo\+0x1b> 1b: R_386_PC32 hidden_undef + +0+1f <hidden_def>: +[ ]*[a-f0-9]+: c3 ret + +0+20 <weak_hidden_def>: +[ ]*[a-f0-9]+: c3 ret + +0+21 <global_def>: +[ ]*[a-f0-9]+: c3 ret + +0+22 <weak_def>: +[ ]*[a-f0-9]+: c3 ret + +0+23 <local>: +[ ]*[a-f0-9]+: c3 ret +#pass diff --git a/gas/testsuite/gas/i386/x86-64-relax-2.d b/gas/testsuite/gas/i386/x86-64-relax-2.d index 7b0bd56..c124102 100644 --- a/gas/testsuite/gas/i386/x86-64-relax-2.d +++ b/gas/testsuite/gas/i386/x86-64-relax-2.d @@ -1,4 +1,5 @@ #source: relax-3.s +#as: -mshared #objdump: -dwr .*: +file format .* @@ -7,26 +8,27 @@ Disassembly of section .text: 0+ <foo>: -[ ]*[a-f0-9]+: eb 1f jmp 21 <local> -[ ]*[a-f0-9]+: eb 19 jmp 1d <hidden_def> +[ ]*[a-f0-9]+: eb 24 jmp 26 <local> +[ ]*[a-f0-9]+: eb 1e jmp 22 <hidden_def> [ ]*[a-f0-9]+: e9 00 00 00 00 jmpq 9 <foo\+0x9> 5: R_X86_64_PC32 global_def-0x4 -[ ]*[a-f0-9]+: e9 00 00 00 00 jmpq e <foo\+0xe> a: R_X86_64_PC32 weak_def-0x4 -[ ]*[a-f0-9]+: e9 00 00 00 00 jmpq 13 <foo\+0x13> f: R_X86_64_PC32 weak_hidden_undef-0x4 -[ ]*[a-f0-9]+: e9 00 00 00 00 jmpq 18 <foo\+0x18> 14: R_X86_64_PC32 weak_hidden_def-0x4 -[ ]*[a-f0-9]+: e9 00 00 00 00 jmpq 1d <hidden_def> 19: R_X86_64_PC32 hidden_undef-0x4 +[ ]*[a-f0-9]+: e9 00 00 00 00 jmpq e <foo\+0xe> a: R_X86_64_PLT32 global_def-0x4 +[ ]*[a-f0-9]+: e9 00 00 00 00 jmpq 13 <foo\+0x13> f: R_X86_64_PC32 weak_def-0x4 +[ ]*[a-f0-9]+: e9 00 00 00 00 jmpq 18 <foo\+0x18> 14: R_X86_64_PC32 weak_hidden_undef-0x4 +[ ]*[a-f0-9]+: e9 00 00 00 00 jmpq 1d <foo\+0x1d> 19: R_X86_64_PC32 weak_hidden_def-0x4 +[ ]*[a-f0-9]+: e9 00 00 00 00 jmpq 22 <hidden_def> 1e: R_X86_64_PC32 hidden_undef-0x4 -0+1d <hidden_def>: +0+22 <hidden_def>: [ ]*[a-f0-9]+: c3 retq -0+1e <weak_hidden_def>: +0+23 <weak_hidden_def>: [ ]*[a-f0-9]+: c3 retq -0+1f <global_def>: +0+24 <global_def>: [ ]*[a-f0-9]+: c3 retq -0+20 <weak_def>: +0+25 <weak_def>: [ ]*[a-f0-9]+: c3 retq -0+21 <local>: +0+26 <local>: [ ]*[a-f0-9]+: c3 retq #pass diff --git a/gas/testsuite/gas/i386/x86-64-relax-3.d b/gas/testsuite/gas/i386/x86-64-relax-3.d new file mode 100644 index 0000000..98fd28d --- /dev/null +++ b/gas/testsuite/gas/i386/x86-64-relax-3.d @@ -0,0 +1,33 @@ +#source: relax-3.s +#objdump: -dwr + +.*: +file format .* + + +Disassembly of section .text: + +0+ <foo>: +[ ]*[a-f0-9]+: eb 21 jmp 23 <local> +[ ]*[a-f0-9]+: eb 1b jmp 1f <hidden_def> +[ ]*[a-f0-9]+: eb 1b jmp 21 <global_def> +[ ]*[a-f0-9]+: e9 00 00 00 00 jmpq b <foo\+0xb> 7: R_X86_64_PLT32 global_def-0x4 +[ ]*[a-f0-9]+: e9 00 00 00 00 jmpq 10 <foo\+0x10> c: R_X86_64_PC32 weak_def-0x4 +[ ]*[a-f0-9]+: e9 00 00 00 00 jmpq 15 <foo\+0x15> 11: R_X86_64_PC32 weak_hidden_undef-0x4 +[ ]*[a-f0-9]+: e9 00 00 00 00 jmpq 1a <foo\+0x1a> 16: R_X86_64_PC32 weak_hidden_def-0x4 +[ ]*[a-f0-9]+: e9 00 00 00 00 jmpq 1f <hidden_def> 1b: R_X86_64_PC32 hidden_undef-0x4 + +0+1f <hidden_def>: +[ ]*[a-f0-9]+: c3 retq + +0+20 <weak_hidden_def>: +[ ]*[a-f0-9]+: c3 retq + +0+21 <global_def>: +[ ]*[a-f0-9]+: c3 retq + +0+22 <weak_def>: +[ ]*[a-f0-9]+: c3 retq + +0+23 <local>: +[ ]*[a-f0-9]+: c3 retq +#pass -- 2.1.0
