Adding libdw DWARF post unwind support, which is part of elfutils-devel/libdw-dev package from version 0.158.
Note: the libdw code needs some support for dwarf unwinding on ARM64, this code is submitted seperately on the elfutils ML.
The new code is contained in unwin-libdw.c object, and implements unwind__get_entries unwind interface function.
Signed-off-by: Jean Pihet jean.pihet@linaro.org Cc: Jiri Olsa jolsa@redhat.com Cc: Corey Ashford cjashfor@linux.vnet.ibm.com Cc: Frederic Weisbecker fweisbec@gmail.com Cc: Ingo Molnar mingo@kernel.org Cc: Namhyung Kim namhyung@kernel.org Cc: Paul Mackerras paulus@samba.org Cc: Peter Zijlstra a.p.zijlstra@chello.nl Cc: Arnaldo Carvalho de Melo acme@ghostprotocols.net Cc: David Ahern dsahern@gmail.com --- tools/perf/arch/arm64/Makefile | 5 +++ tools/perf/arch/arm64/util/unwind-libdw.c | 53 +++++++++++++++++++++++++++++++ 2 files changed, 58 insertions(+) create mode 100644 tools/perf/arch/arm64/util/unwind-libdw.c
diff --git a/tools/perf/arch/arm64/Makefile b/tools/perf/arch/arm64/Makefile index 221f21d..09d6215 100644 --- a/tools/perf/arch/arm64/Makefile +++ b/tools/perf/arch/arm64/Makefile @@ -4,6 +4,11 @@ LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/dwarf-regs.o endif ifndef NO_LIBUNWIND LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/unwind-libunwind.o +endif +ifndef NO_LIBDW_DWARF_UNWIND +LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/unwind-libdw.o +endif +ifndef NO_DWARF_UNWIND LIB_OBJS += $(OUTPUT)arch/$(ARCH)/tests/regs_load.o LIB_OBJS += $(OUTPUT)arch/$(ARCH)/tests/dwarf-unwind.o endif diff --git a/tools/perf/arch/arm64/util/unwind-libdw.c b/tools/perf/arch/arm64/util/unwind-libdw.c new file mode 100644 index 0000000..8d24958 --- /dev/null +++ b/tools/perf/arch/arm64/util/unwind-libdw.c @@ -0,0 +1,53 @@ +#include <elfutils/libdwfl.h> +#include "../../util/unwind-libdw.h" +#include "../../util/perf_regs.h" + +bool libdw__arch_set_initial_registers(Dwfl_Thread *thread, void *arg) +{ + struct unwind_info *ui = arg; + struct regs_dump *user_regs = &ui->sample->user_regs; + Dwarf_Word dwarf_regs[PERF_REG_ARM64_MAX]; + +#define REG(r) ({ \ + Dwarf_Word val = 0; \ + perf_reg_value(&val, user_regs, PERF_REG_ARM64_##r); \ + val; \ +}) + + dwarf_regs[0] = REG(X0); + dwarf_regs[1] = REG(X1); + dwarf_regs[2] = REG(X2); + dwarf_regs[3] = REG(X3); + dwarf_regs[4] = REG(X4); + dwarf_regs[5] = REG(X5); + dwarf_regs[6] = REG(X6); + dwarf_regs[7] = REG(X7); + dwarf_regs[8] = REG(X8); + dwarf_regs[9] = REG(X9); + dwarf_regs[10] = REG(X10); + dwarf_regs[11] = REG(X11); + dwarf_regs[12] = REG(X12); + dwarf_regs[13] = REG(X13); + dwarf_regs[14] = REG(X14); + dwarf_regs[15] = REG(X15); + dwarf_regs[16] = REG(X16); + dwarf_regs[17] = REG(X17); + dwarf_regs[18] = REG(X18); + dwarf_regs[19] = REG(X19); + dwarf_regs[20] = REG(X20); + dwarf_regs[21] = REG(X21); + dwarf_regs[22] = REG(X22); + dwarf_regs[23] = REG(X23); + dwarf_regs[24] = REG(X24); + dwarf_regs[25] = REG(X25); + dwarf_regs[26] = REG(X26); + dwarf_regs[27] = REG(X27); + dwarf_regs[28] = REG(X28); + dwarf_regs[29] = REG(X29); + dwarf_regs[30] = REG(LR); + dwarf_regs[31] = REG(SP); + dwarf_regs[32] = REG(PC); + + return dwfl_thread_state_registers(thread, 0, PERF_REG_ARM64_MAX, + dwarf_regs); +}