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. Note: --enable-debug-frame is automatically selected on ARM.
The generated perf binary has been tested on ARMv7 (OMAP4, Marvell Armada XP) and x86_64, using the following commands: perf record -g [dwarf] -- <binary> perf report --sort symbol --call-graph --stdio
Jean Pihet (2): perf tools: Check libunwind for availability of dwarf parsing feature 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 | 13 ++++-- tools/perf/config/feature-tests.mak | 21 ++++++++- tools/perf/util/unwind.c | 75 ++++++++++++++++++++++++++------- 11 files changed, 251 insertions(+), 20 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