From: Tim 'mithro' Ansell <mit...@mithis.com>
Exception Prefix High (EPH) control bit of the Supervision Register
(SR).
The significant bits (31-12) of the vector offset address for each
exception depend on the setting of the Supervision Register (SR)'s EPH
bit and the Exception Vector Base Address Register (EVBAR).
If SR[EPH] is set, the vector offset is logically ORed with the offset
0xF0000000.
This means if EPH is;
* 0 - Exceptions vectors start at EVBAR
* 1 - Exception vectors start at EVBAR | 0xF0000000
Signed-off-by: Tim 'mithro' Ansell <mit...@mithis.com>
Signed-off-by: Stafford Horne <sho...@gmail.com>
---
target/openrisc/interrupt.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/target/openrisc/interrupt.c b/target/openrisc/interrupt.c
index 78f0ba9..2c91fab 100644
--- a/target/openrisc/interrupt.c
+++ b/target/openrisc/interrupt.c
@@ -69,6 +69,9 @@ void openrisc_cpu_do_interrupt(CPUState *cs)
if (env->cpucfgr & CPUCFGR_EVBARP) {
vect_pc |= env->evbar;
}
+ if (env->sr & SR_EPH) {
+ vect_pc |= 0xf0000000;
+ }
env->pc = vect_pc;
} else {
cpu_abort(cs, "Unhandled exception 0x%x\n", cs->exception_index);
--
2.9.3
