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authorStefano Sanfilippo <ssanfilippo@chromium.org>2016-10-13 03:59:40 -0700
committerArnaldo Carvalho de Melo <acme@redhat.com>2016-10-24 11:07:39 -0300
commit0284fecd13b6db3ecd4c2b1bf3e72b105edce24b (patch)
tree87b58d544456e254ac939215eb813b8fe07b1427 /tools/perf/util/include
parenteac05af2bf33aa9474482f1f19555adfd2cdf69d (diff)
downloadlinux-0284fecd13b6db3ecd4c2b1bf3e72b105edce24b.tar.bz2
perf jit: Add unwinding support
This record is intended to provide unwinding information in the eh_frame format. This is required to unwind JITed code which does not maintain the frame pointer register during function calls. The eh_frame unwinding information can be emitted by V8 / Chromium when the --perf_prof_unwinding_info is passed. A record of type jr_code_unwinding_info comes before the jr_code_load it referred to and contains both the .eh_frame and .eh_frame_hdr. The fields in the header have the following meaning: * unwinding_size: size of the eh_frame and eh_frame_hdr, necessary for distinguishing the content from the padding. * eh_frame_hdr_size: as the name says. * mapped_size: size of the payload that was in memory at runtime. typically unwinding_size if the .eh_frame_hdr and .eh_frame were mapped, or 0 if they weren't. It should always be the former case, since the .eh_frame is guaranteed to be mapped in memory. However, certain JITs might want to inject an .eh_frame_hdr with an empty LUT to trigger fp-based unwinding fallback in libunwind. The only part of the .eh_frame_hdr that libunwind reads from remote memory is the LUT, and since there is none, mapping the unwinding info in memory is not necessary, and 0 in this field signifies that it wasn't. This practical hack allows to save bytes in code memory for those JIT compilers that might or might not maintain a valid frame pointer. The payload that follows is assumed to contain first the .eh_frame and then the .eh_header_hdr, with no padding between the two. Signed-off-by: Stefano Sanfilippo <ssanfilippo@chromium.org> Signed-off-by: Ross McIlroy <rmcilroy@chromium.org> Reviewed-by: Stephane Eranian <eranian@google.com> Cc: Anton Blanchard <anton@ozlabs.org> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/1476356383-30100-7-git-send-email-eranian@google.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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