commit 2c25c6581e48185d96d1ae6107b0a7f2a1b4f0af
author Mike McTernan <mikemcternan@google.com> Fri Nov 25 13:49:04 2022 +0000
committer Mike McTernan <mikemcternan@google.com> Tue Jan 24 14:39:27 2023 +0000
tree 83aec92d5b981a1b94fe4ef59b2289a15c29e44a
parent 99cff63bbb5778f27da9d0cf5a119d2c08a8a446

kernel: arm64: Add Branch Target Exception handler.

Bug: 260397427
Test: build.py qemu-generic-arm64-test-debug
Test: build.py qemu-generic-arm32-test-debug
Change-Id: I9ea9a454e231546b84547d3c9a82e4dcc4b30e12

arch/arm64/exceptions_c.c

diff --git a/arch/arm64/exceptions_c.c b/arch/arm64/exceptions_c.c
index 3496117..89f49db 100644
--- a/arch/arm64/exceptions_c.c
+++ b/arch/arm64/exceptions_c.c
@@ -494,6 +494,16 @@
             print_fault_code(dfsc, far);
             break;
         }
+        case 0b001101: { /* branch target exception */
+#if TEST_BUILD
+            if (check_fault_handler_table(iframe)) {
+                return;
+            }
+#endif
+            printf("branch target exception: BTYPE=0x%lx, "
+                   "PC at 0x%" PRIx64 "(0x%lx)\n", BITS(iss, 1, 0), iframe->elr, display_pc);
+            break;
+        }
         case 0b111100: {
             printf("BRK #0x%04lx instruction: PC at 0x%" PRIx64 "(0x%lx)\n",
                    BITS_SHIFT(iss, 15, 0), iframe->elr, display_pc);