_REG_EBP
gr[_REG_EBP] = (__greg_t)0; /* Wipe out frame pointer. */
gr[_REG_EBP] = tf->tf_ebp;
tf->tf_ebp = gr[_REG_EBP];
#define _UC_MACHINE_FP(uc) ((uc)->uc_mcontext.__gregs[_REG_EBP])
gdb_regs[ 5] = gregs[_REG_EBP];
gregs[_REG_EBP] = gdb_regs[ 5];