perf tools: Add libdw DWARF post unwind support for ARM

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

#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_ARM_MAX];

#define REG(r) ({						\

	Dwarf_Word val = 0;					\

	perf_reg_value(&val, user_regs, PERF_REG_ARM_##r);	\

	val;							\

})

	dwarf_regs[0]  = REG(R0);

	dwarf_regs[1]  = REG(R1);

	dwarf_regs[2]  = REG(R2);

	dwarf_regs[3]  = REG(R3);

	dwarf_regs[4]  = REG(R4);

	dwarf_regs[5]  = REG(R5);

	dwarf_regs[6]  = REG(R6);

	dwarf_regs[7]  = REG(R7);

	dwarf_regs[8]  = REG(R8);

	dwarf_regs[9]  = REG(R9);

	dwarf_regs[10] = REG(R10);

	dwarf_regs[11] = REG(FP);

	dwarf_regs[12] = REG(IP);

	dwarf_regs[13] = REG(SP);

	dwarf_regs[14] = REG(LR);

	dwarf_regs[15] = REG(PC);

	return dwfl_thread_state_registers(thread, 0, PERF_REG_ARM_MAX,

					   dwarf_regs);

}