microblaze: Add infrastructure for supporting hw exceptions.
Signed-off-by: Edgar E. Iglesias <[email protected]>
diff --git a/target-microblaze/helper.c b/target-microblaze/helper.c
index 7fbb5dd..40d27b9 100644
--- a/target-microblaze/helper.c
+++ b/target-microblaze/helper.c
@@ -126,6 +126,37 @@
assert(!(env->iflags & (DRTI_FLAG | DRTE_FLAG | DRTB_FLAG)));
/* assert(env->sregs[SR_MSR] & (MSR_EE)); Only for HW exceptions. */
switch (env->exception_index) {
+ case EXCP_HW_EXCP:
+ if (!(env->pvr.regs[0] & PVR0_USE_EXC_MASK)) {
+ qemu_log("Exception raised on system without exceptions!\n");
+ return;
+ }
+
+ env->regs[17] = env->sregs[SR_PC] + 4;
+ env->sregs[SR_ESR] &= ~(1 << 12);
+
+ /* Exception breaks branch + dslot sequence? */
+ if (env->iflags & D_FLAG) {
+ env->sregs[SR_ESR] |= 1 << 12 ;
+ env->sregs[SR_BTR] = env->btarget;
+ }
+
+ /* Disable the MMU. */
+ t = (env->sregs[SR_MSR] & (MSR_VM | MSR_UM)) << 1;
+ env->sregs[SR_MSR] &= ~(MSR_VMS | MSR_UMS | MSR_VM | MSR_UM);
+ env->sregs[SR_MSR] |= t;
+ /* Exception in progress. */
+ env->sregs[SR_MSR] |= MSR_EIP;
+
+ qemu_log_mask(CPU_LOG_INT,
+ "hw exception at pc=%x ear=%x esr=%x iflags=%x\n",
+ env->sregs[SR_PC], env->sregs[SR_EAR],
+ env->sregs[SR_ESR], env->iflags);
+ log_cpu_state_mask(CPU_LOG_INT, env, 0);
+ env->iflags &= ~(IMM_FLAG | D_FLAG);
+ env->sregs[SR_PC] = 0x20;
+ break;
+
case EXCP_MMU:
env->regs[17] = env->sregs[SR_PC];
