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Re: probing a plt

From: Stan Cox <scox at redhat dot com>
To: systemtap at sources dot redhat dot com
Date: Fri, 09 Sep 2011 14:03:18 -0400
Subject: Re: probing a plt
References: <4E6121E1.6040305@redhat.com> <y0m39gevdwz.fsf@fche.csb>

The unusual behavior was because query_module_symtab, when given an address, was returning the address of the containing entry. Making an exception in query_module_symtab for the .plt case now gives predictable results: (this test program dumps out the plt table)

stap --kelf -c "./plt.x plt.x" -e 'probe process("./plt.x").plt {printf("plt entry %s\n",$$name)}' plt entry __libc_start_main plt entry elf_version plt entry open plt entry elf_begin plt entry elf_kind plt entry gelf_getehdr plt entry calloc plt entry __stpcpy_chk plt entry dlopen plt entry __stpcpy_chk plt entry dlopen plt entry gelf_getehdr plt entry dwfl_begin plt entry dwfl_report_offline plt entry dwfl_report_end plt entry dwfl_module_getelf plt entry elf_getshstrndx plt entry gelf_getphdr plt entry gelf_getphdr plt entry gelf_getphdr plt entry elf_rawfile plt entry printf plt entry elf_nextscn plt entry gelf_getshdr plt entry elf_strptr plt entry elf_nextscn plt entry gelf_getshdr plt entry elf_strptr plt entry elf_nextscn plt entry gelf_getshdr plt entry elf_strptr plt entry elf_nextscn plt entry gelf_getshdr plt entry elf_strptr plt entry elf_nextscn plt entry gelf_getshdr plt entry elf_strptr plt entry elf_nextscn plt entry gelf_getshdr plt entry elf_strptr plt entry elf_nextscn plt entry gelf_getshdr plt entry elf_strptr plt entry elf_nextscn plt entry gelf_getshdr plt entry elf_strptr plt entry elf_nextscn plt entry gelf_getshdr plt entry elf_strptr plt entry elf_nextscn plt entry gelf_getshdr plt entry elf_strptr plt entry elf_nextscn plt entry gelf_getshdr plt entry elf_getdata plt entry elf_scnshndx plt entry elf_getshstrndx plt entry gelf_getrela plt entry gelf_getsymshndx plt entry elf_getscn plt entry gelf_getshdr plt entry dwfl_module_relocate_address plt entry dwfl_standard_find_debuginfo ...

References:
- probing a plt
  - From: Stan Cox
- Re: probing a plt
  - From: Frank Ch. Eigler

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