From: Jean Pihet jean.pihet@newoldbits.com
This patch implements the functions required for the perf registers API, allowing the perf tool to interface kernel register dumps with libunwind in order to provide userspace backtracing. Only the general purpose user space registers are exported, i.e.: PERF_REG_ARM_X0, ... PERF_REG_ARM_X28, PERF_REG_ARM_FP, PERF_REG_ARM_LR, PERF_REG_ARM_SP, PERF_REG_ARM_PC and not the PERF_REG_ARM_V* registers.
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, NOT on ARM64.
The generated perf binary has been tested on ARMv8 (using the foundation model simulator) and x86_64, using the following commands: perf record -g [fp,dwarf] -- <binary> perf report --sort symbol --call-graph --stdio
Jean Pihet (2): ARM64: perf: add support for perf registers API ARM64: perf: wire up perf_regs and unwind support
arch/arm64/Kconfig | 2 + arch/arm64/include/uapi/asm/Kbuild | 1 + arch/arm64/include/uapi/asm/perf_regs.h | 40 ++++++++++++++ arch/arm64/kernel/Makefile | 1 + arch/arm64/kernel/perf_regs.c | 29 ++++++++++ tools/perf/arch/arm64/Makefile | 7 +++ tools/perf/arch/arm64/include/perf_regs.h | 88 +++++++++++++++++++++++++++++++ tools/perf/arch/arm64/util/dwarf-regs.c | 81 ++++++++++++++++++++++++++++ tools/perf/arch/arm64/util/unwind.c | 82 ++++++++++++++++++++++++++++ tools/perf/config/Makefile | 6 +++ 10 files changed, 337 insertions(+) create mode 100644 arch/arm64/include/uapi/asm/perf_regs.h create mode 100644 arch/arm64/kernel/perf_regs.c create mode 100644 tools/perf/arch/arm64/Makefile create mode 100644 tools/perf/arch/arm64/include/perf_regs.h create mode 100644 tools/perf/arch/arm64/util/dwarf-regs.c create mode 100644 tools/perf/arch/arm64/util/unwind.c