BX 178 arch/x86/um/signal.c GETREG(BX, bx); BX 257 arch/x86/um/signal.c PUTREG(BX, bx); BX 15 tools/perf/arch/x86/util/perf_regs.c SMPL_REG(BX, PERF_REG_X86_BX), BX 24 tools/perf/arch/x86/util/unwind-libdw.c dwarf_regs[3] = REG(BX); BX 35 tools/perf/arch/x86/util/unwind-libdw.c dwarf_regs[3] = REG(BX);