[LLVMbugs] [Bug 13650] New: llvm-objdump does not give information about all relocations
bugzilla-daemon at llvm.org
bugzilla-daemon at llvm.org
Mon Aug 20 04:29:44 PDT 2012
http://llvm.org/bugs/show_bug.cgi?id=13650
Bug #: 13650
Summary: llvm-objdump does not give information about all
relocations
Product: libraries
Version: 3.1
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P
Component: Archive library
AssignedTo: unassignedbugs at nondot.org
ReportedBy: Aleksandrs.Saveljevs at gmail.com
CC: llvmbugs at cs.uiuc.edu
Classification: Unclassified
We are trying to use LLVM API to programmatically obtain a list of relocations
in an ELF file. The way we are doing this is exactly as llvm-objdump does it:
we are iterating through sections and in each section we are iterating over
relocations (see PrintRelocations() function at
https://llvm.org/svn/llvm-project/llvm/trunk/tools/llvm-objdump/llvm-objdump.cpp).
However, it does not give us relocation entries in .rela.dyn section.
Consider, for instance, the output of "readelf -r /bin/true":
$ readelf -r /bin/true
Relocation section '.rela.dyn' at offset 0xa80 contains 5 entries:
Offset Info Type Sym. Value Sym. Name +
Addend
000000604c38 001800000006 R_X86_64_GLOB_DAT 0000000000000000 __gmon_start__ +
0
000000604de0 002800000005 R_X86_64_COPY 0000000000604de0 __progname + 0
000000604df0 002700000005 R_X86_64_COPY 0000000000604df0 stdout + 0
000000604e00 002a00000005 R_X86_64_COPY 0000000000604e00 __progname_full +
0
000000604e08 002c00000005 R_X86_64_COPY 0000000000604e08 stderr + 0
Relocation section '.rela.plt' at offset 0xaf8 contains 37 entries:
Offset Info Type Sym. Value Sym. Name +
Addend
000000604c60 000100000007 R_X86_64_JUMP_SLO 0000000000000000 free + 0
000000604c68 000200000007 R_X86_64_JUMP_SLO 0000000000000000 abort + 0
000000604c70 000300000007 R_X86_64_JUMP_SLO 0000000000000000 __errno_location
+ 0
000000604c78 000400000007 R_X86_64_JUMP_SLO 0000000000000000 _exit + 0
000000604c80 000500000007 R_X86_64_JUMP_SLO 0000000000000000 __fpending + 0
...
(The list for .rela.plt has been truncated for brevity.)
If we now run "llvm-objdump-3.1 -r /bin/true", we will only get a list of
entries in .rela.plt section:
$ llvm-objdump-3.1 -r /bin/true | grep -c JUMP_SLOT
37
It would be nice if there would be a way to get at relocation entries in
.rela.dyn section.
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