kernel/tools/perf/util/symbol-elf.c, branch linux-3.11.y

perf report: Add --no-demangle option

2013-03-26T19:38:21Z

It's sometimes useful to see undemangled raw symbol name for example other tools using the perf output to do manipulation of binaries. Signed-off-by: Namhyung Kim Suggested-by: William Cohen Cc: Ingo Molnar Cc: Paul Mackerras Cc: Peter Zijlstra Cc: William Cohen BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=55571 Link: http://lkml.kernel.org/r/1364203098-17741-1-git-send-email-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo

perf symbols: Include elf.h header regardless LIBELF_SUPPORT

2013-01-24T19:40:18Z

The elf.h header file is used for NO_LIBELF build too so it should be included anyway. Also remove duplicated include of the header file in symbol-*.c. This patch fixes following build error on NO_LIBELF build: CC tests/hists_link.o tests/hists_link.c: In function ‘setup_fake_machine’: tests/hists_link.c:132:8: error: ‘STB_GLOBAL’ undeclared (first use in this function) tests/hists_link.c:132:8: note: each undeclared identifier is reported only once for each function it appears in Signed-off-by: Namhyung Kim Cc: David Ahern Cc: Ingo Molnar Cc: Jiri Olsa Cc: Paul Mackerras Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/1356679009-32122-1-git-send-email-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo

perf symbols: Ignore ABS symbols when loading data maps

2012-12-09T11:46:05Z

When loading symbols in a data mapping, ABS symbols (which has a value of SHN_ABS in its st_shndx) failed at elf_getscn(). And it marks the loading as a failure so already loaded symbols cannot be fixed up. I'm not sure what should be done. Just ignore them for now. :) Signed-off-by: Namhyung Kim Cc: Andi Kleen Cc: Ingo Molnar Cc: Jiri Olsa Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Stephane Eranian Link: http://lkml.kernel.org/r/1353502185-26521-19-git-send-email-eranian@google.com Signed-off-by: Arnaldo Carvalho de Melo

perf symbols: Fix builds with NO_LIBELF set

2012-08-20T12:35:22Z

Build currently fails: $ make -C tools/perf O=/tmp/pbuild NO_LIBELF=1 util/symbol.c: In function ‘dso__load’: util/symbol.c:1128:27: error: ‘struct symsrc’ has no member named ‘dynsym’ CC /tmp/pbuild/util/pager.o make: *** [/tmp/pbuild/util/symbol.o] Error 1 make: *** Waiting for unfinished jobs.... Moving the dynsym reference to symbol-elf.c reveals that NO_LIBELF requires NO_LIBUNWIND: $ make -C tools/perf O=/tmp/pbuild NO_LIBELF=1 LINK /tmp/pbuild/perf /tmp/pbuild/libperf.a(unwind.o): In function `elf_section_offset': /opt/sw/ahern/perf.git/tools/perf/util/unwind.c:176: undefined reference to `elf_begin' /opt/sw/ahern/perf.git/tools/perf/util/unwind.c:181: undefined reference to `gelf_getehdr' /tmp/pbuild/libperf.a(unwind.o): In function `elf_section_by_name': /opt/sw/ahern/perf.git/tools/perf/util/unwind.c:157: undefined reference to `elf_nextscn' /opt/sw/ahern/perf.git/tools/perf/util/unwind.c:160: undefined reference to `gelf_getshdr' /opt/sw/ahern/perf.git/tools/perf/util/unwind.c:161: undefined reference to `elf_strptr' /tmp/pbuild/libperf.a(unwind.o): In function `elf_section_offset': /opt/sw/ahern/perf.git/tools/perf/util/unwind.c:190: undefined reference to `elf_end' /tmp/pbuild/libperf.a(unwind.o): In function `read_unwind_spec': /opt/sw/ahern/perf.git/tools/perf/util/unwind.c:190: undefined reference to `elf_end' collect2: ld returned 1 exit status make: *** [/tmp/pbuild/perf] Error 1 make: Leaving directory `/opt/sw/ahern/perf.git/tools/perf' This patch fixes both. Reviewed-by: Namhyung Kim Signed-off-by: David Ahern Cc: Jiri Olsa Cc: Namhyung Kim Link: http://lkml.kernel.org/r/1345391234-71906-1-git-send-email-dsahern@gmail.com Signed-off-by: Arnaldo Carvalho de Melo

perf symbols: Use both runtime and debug images

2012-08-13T17:46:55Z

We keep both a 'runtime' elf image as well as a 'debug' elf image around and generate symbols by looking at both of these. This eliminates the need for the want_symtab/goto restart mechanism combined with iterating over and reopening the elf images a second time. Also give dso__synthsize_plt_symbols() the runtime image (which has dynsyms) instead of the symbol image (which may only have a symtab and no dynsyms). Previously if a debug image was found all runtime images were ignored. This fixes 2 issues: - Symbol resolution to failure on PowerPC systems with debug symbols installed, as the debug images lack a '.opd' section which contains function descriptors. - On all archs, plt synthesis failed when a debug image was loaded and that debug image lacks a dynsym section while a runtime image has a dynsym section. Assumptions: - If a .opd section exists, it is contained in the highest priority image with a dynsym section. - This generally implies that the debug image lacks a dynsym section (ie: it is marked as NO_BITS). Signed-off-by: Cody P Schafer Cc: David Hansen Cc: Ingo Molnar Cc: Matt Hellsley Cc: Namhyung Kim Cc: Paul Mackerras Cc: Peter Zijlstra Cc: Sukadev Bhattiprolu Link: http://lkml.kernel.org/r/1344637382-22789-17-git-send-email-cody@linux.vnet.ibm.com Signed-off-by: Arnaldo Carvalho de Melo

perf symbols: Convert dso__load_syms to take 2 symsrc's

2012-08-13T17:41:33Z

To properly handle platforms with an opd section, both a runtime image (which contains the opd section but possibly lacks symbols) and a symbol image (which probably lacks an opd section but has symbols). The next patch ("perf symbol: use both runtime and debug images") adjusts the callsite in dso__load() to take advantage of being able to pass both runtime & debug images. Assumptions made here: - The opd section, if it exists in the runtime image, has headers in both the runtime image and the debug/syms image. - The index of the opd section (again, only if it exists in the runtime image) is the same in both the runtime and debug/symbols image. Both of these are true on RHEL, but it is unclear how accurate they are in general (on platforms with function descriptors in opd sections). Signed-off-by: Cody P Schafer Cc: David Hansen Cc: Ingo Molnar Cc: Matt Hellsley Cc: Namhyung Kim Cc: Paul Mackerras Cc: Peter Zijlstra Cc: Sukadev Bhattiprolu Link: http://lkml.kernel.org/r/1344637382-22789-16-git-send-email-cody@linux.vnet.ibm.com Signed-off-by: Arnaldo Carvalho de Melo

perf symbols: Factor want_symtab out of dso__load_sym()

2012-08-13T17:37:37Z

Only one callsite of dso__load_sym() uses the want_symtab functionality, so place the logic at the callsite instead of within dso__load_sym(). This sets us up for removal of want_symtab completely once we keep multiple elf handles (within symsrc's) around. Setup for the later patch "perf symbols: Use both runtime and debug images" Signed-off-by: Cody P Schafer Cc: David Hansen Cc: Ingo Molnar Cc: Matt Hellsley Cc: Namhyung Kim Cc: Paul Mackerras Cc: Peter Zijlstra Cc: Sukadev Bhattiprolu Link: http://lkml.kernel.org/r/1344637382-22789-15-git-send-email-cody@linux.vnet.ibm.com Signed-off-by: Arnaldo Carvalho de Melo

perf symbols: Switch dso__synthesize_plt_symbols() to use symsrc

2012-08-13T17:34:36Z

Previously dso__synthesize_plt_symbols() was reopening the elf file to obtain dynsyms from it. Rather than reopen the file, use the already opened reference within the symsrc to access it. Setup for the later patch "perf symbols: Use both runtime and debug images" Signed-off-by: Cody P Schafer Cc: David Hansen Cc: Ingo Molnar Cc: Matt Hellsley Cc: Namhyung Kim Cc: Paul Mackerras Cc: Peter Zijlstra Cc: Sukadev Bhattiprolu Link: http://lkml.kernel.org/r/1344637382-22789-14-git-send-email-cody@linux.vnet.ibm.com Signed-off-by: Arnaldo Carvalho de Melo

perf symbols: Set symtab_type in dso__load_sym

2012-08-13T17:33:01Z

In certain cases, dso__load requires dso->symbol_type to be set prior to calling it. With the introduction of symsrc*, the symtab_type is now stored in a symsrc which is then passed to dso__load_sym(). Change dso__load_sym() to use the symtab_type from them symsrc (setting dso->symtab_type as well). Setup for later patch "perf symbols: Use both runtime and debug images" Signed-off-by: Cody P Schafer Cc: David Hansen Cc: Ingo Molnar Cc: Matt Hellsley Cc: Namhyung Kim Cc: Paul Mackerras Cc: Peter Zijlstra Cc: Sukadev Bhattiprolu Link: http://lkml.kernel.org/r/1344637382-22789-13-git-send-email-cody@linux.vnet.ibm.com Signed-off-by: Arnaldo Carvalho de Melo

perf symbols: Introduce symsrc structure.

2012-08-13T17:31:44Z

Factors opening of certain sections & tracking certain elf info into an external structure. The goal here is to keep multiple elfs (and their looked up sections/indexes) around during the symbol generation process (in dso__load()). We need this to properly resolve symbols on PPC due to the use of function descriptors & the .opd section (ie: symbols which are functions don't point to their actual location, they point to their function descriptor in .opd which contains their actual location. It would be possible to just keep the (Elf *) around, but then we'd end up with duplicate code for looking up the same sections and checking for the existence of an important section wouldn't be as clean (and we need to keep the Elf stuff confined to symtab-elf.c). Utilized by the later patch "perf symbols: Use both runtime and debug images" Signed-off-by: Cody P Schafer Cc: David Hansen Cc: Ingo Molnar Cc: Matt Hellsley Cc: Namhyung Kim Cc: Paul Mackerras Cc: Peter Zijlstra Cc: Sukadev Bhattiprolu Link: http://lkml.kernel.org/r/1344637382-22789-12-git-send-email-cody@linux.vnet.ibm.com Signed-off-by: Arnaldo Carvalho de Melo