PERF_REG_SP        32 tools/perf/util/perf_regs.h #define DWARF_MINIMAL_REGS ((1ULL << PERF_REG_IP) | (1ULL << PERF_REG_SP))
PERF_REG_SP       133 tools/perf/util/unwind-libdw.c 	ret = perf_reg_value(&start, &ui->sample->user_regs, PERF_REG_SP);
PERF_REG_SP        42 tools/perf/util/unwind.h #define LIBUNWIND__ARCH_REG_SP PERF_REG_SP