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diff --git a/sys/arm64/arm64/locore.S b/sys/arm64/arm64/locore.S
--- a/sys/arm64/arm64/locore.S
+++ b/sys/arm64/arm64/locore.S
@@ -866,7 +866,7 @@
.quad (SCTLR_LSMAOE | SCTLR_nTLSMD | SCTLR_UCI | SCTLR_SPAN | \
SCTLR_nTWE | SCTLR_nTWI | SCTLR_UCT | SCTLR_DZE | \
SCTLR_I | SCTLR_SED | SCTLR_SA0 | SCTLR_SA | SCTLR_C | \
- SCTLR_M | SCTLR_CP15BEN)
+ SCTLR_M | SCTLR_CP15BEN | SCTLR_BT1 | SCTLR_BT0)
sctlr_clear:
/* Bits to clear */
.quad (SCTLR_EE | SCTLR_E0E | SCTLR_IESB | SCTLR_WXN | SCTLR_UMA | \
diff --git a/sys/arm64/arm64/trap.c b/sys/arm64/arm64/trap.c
--- a/sys/arm64/arm64/trap.c
+++ b/sys/arm64/arm64/trap.c
@@ -554,6 +554,11 @@
panic("Undefined instruction: %08x",
*(uint32_t *)frame->tf_elr);
break;
+ case EXCP_BTI:
+ print_registers(frame);
+ print_gp_register("far", far);
+ panic("Branch Target exception");
+ break;
default:
print_registers(frame);
print_gp_register("far", far);
@@ -695,6 +700,11 @@
(void *)frame->tf_elr, exception);
userret(td, frame);
break;
+ case EXCP_BTI:
+ call_trapsignal(td, SIGILL, ILL_ILLOPC, (void *)frame->tf_elr,
+ exception);
+ userret(td, frame);
+ break;
default:
call_trapsignal(td, SIGBUS, BUS_OBJERR, (void *)frame->tf_elr,
exception);
diff --git a/sys/arm64/include/armreg.h b/sys/arm64/include/armreg.h
--- a/sys/arm64/include/armreg.h
+++ b/sys/arm64/include/armreg.h
@@ -393,6 +393,7 @@
#define EXCP_UNKNOWN 0x00 /* Unkwn exception */
#define EXCP_TRAP_WFI_WFE 0x01 /* Trapped WFI or WFE */
#define EXCP_FP_SIMD 0x07 /* VFP/SIMD trap */
+#define EXCP_BTI 0x0d /* Branch Target Exception */
#define EXCP_ILL_STATE 0x0e /* Illegal execution state */
#define EXCP_SVC32 0x11 /* SVC trap for AArch32 */
#define EXCP_SVC64 0x15 /* SVC trap for AArch64 */

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