On 11/2/21 6:52 PM, Warner Losh wrote:
+ case EXCP_UDEF:
+ {
+ /* See arm/arm/undefined.c undefinedinstruction(); */
+ info.si_addr = env->regs[15];
+
+ /*
+ * Make sure the PC is correctly aligned. (It should
+ * be.)
+ */
+ if ((info.si_addr & 3) != 0) {
+ info.si_signo = TARGET_SIGILL;
+ info.si_errno = 0;
+ info.si_code = TARGET_ILL_ILLADR;
+ queue_signal(env, info.si_signo, &info);
You won't need this; unaligned pc will raise a different exception.
+ } else {
+ int rc = 0;
+#ifdef NOT_YET
+ uint32_t opcode;
+
+ /*
+ * Get the opcode.
+ *
+ * FIXME - what to do if get_user() fails?
+ */
+ get_user_u32(opcode, env->regs[15]);
+
+ /* Check the opcode with CP handlers we may have. */
+ rc = EmulateAll(opcode, &ts->fpa, env);
+#endif /* NOT_YET */
Drop this til you need it. Even then, we prefer to emulate all insns in the front-end.
We can talk about what changes need to happen such that the actual CP registers are simply
available at EL0. I suspect they've already been done for linux-user anyway...
r~
