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Subject[PATCH 0/3] perf: parse the dwarf backtrace info from .debug_frame section
Date
On ARM the debug info is not present in the .eh_frame sections but
in .debug_frame instead, in dwarf format.

This patch set uses libunwind to load and parse the dwarf debug info from
the .debug_frame section if no .eh_frame_hdr section is found; also it
sets the hooks in the perf_regs and libunwind code for ARMv7.

Dependencies:
. if present, libunwind >= 1.1 is needed to prevent a segfault when
parsing the dwarf info,
. libunwind needs to be configured with --enable-debug-frame
to prevent a linkage error. Note: --enable-debug-frame is automatically
selected on ARM).

The generated perf has been tested on ARMv7/OMAP4 and x86_64, using the
following commands:
perf record -g [dwarf] -- <binary>
perf report --sort symbol --call-graph --stdio


Jean Pihet (1):
perf: parse the .debug_frame section in case .eh_frame is not present

Will Deacon (2):
ARM: perf: add support for perf registers API
ARM: perf: wire up perf_regs and unwind support for ARM

arch/arm/Kconfig | 2 +
arch/arm/include/uapi/asm/Kbuild | 1 +
arch/arm/include/uapi/asm/perf_regs.h | 23 +++++++++++
arch/arm/kernel/Makefile | 1 +
arch/arm/kernel/perf_regs.c | 30 ++++++++++++++
tools/perf/arch/arm/Makefile | 3 ++
tools/perf/arch/arm/include/perf_regs.h | 54 +++++++++++++++++++++++++
tools/perf/arch/arm/util/unwind.c | 48 ++++++++++++++++++++++
tools/perf/config/Makefile | 9 +++--
tools/perf/util/unwind.c | 71 +++++++++++++++++++++++++--------
10 files changed, 223 insertions(+), 19 deletions(-)
create mode 100644 arch/arm/include/uapi/asm/perf_regs.h
create mode 100644 arch/arm/kernel/perf_regs.c
create mode 100644 tools/perf/arch/arm/include/perf_regs.h
create mode 100644 tools/perf/arch/arm/util/unwind.c

--
1.7.11.7



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