diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp b/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp
--- a/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp
@@ -1789,7 +1789,7 @@
 void internal_join_thread(void *th) {}
 #endif
 
-#if defined(__aarch64__)
+#if SANITIZER_LINUX && defined(__aarch64__)
 // Android headers in the older NDK releases miss this definition.
 struct __sanitizer_esr_context {
   struct _aarch64_ctx head;
@@ -1810,6 +1810,11 @@
   }
   return false;
 }
+#elif SANITIZER_FREEBSD && defined(__aarch64__)
+// FreeBSD doesn't provide ESR in the ucontext.
+static bool Aarch64GetESR(ucontext_t *ucontext, u64 *esr) {
+  return false;
+}
 #endif
 
 using Context = ucontext_t;
@@ -1882,7 +1887,7 @@
   static const uptr FSR_WRITE = 1U << 11;
   uptr fsr = ucontext->uc_mcontext.error_code;
   return fsr & FSR_WRITE ? Write : Read;
-#elif defined(__aarch64__)
+#elif (SANITIZER_LINUX || SANITIZER_FREEBSD) && defined(__aarch64__)
   static const u64 ESR_ELx_WNR = 1U << 6;
   u64 esr;
   if (!Aarch64GetESR(ucontext, &esr)) return Unknown;
@@ -2035,10 +2040,17 @@
   *bp = ucontext->uc_mcontext.arm_fp;
   *sp = ucontext->uc_mcontext.arm_sp;
 #elif defined(__aarch64__)
+# if SANITIZER_FREEBSD
+  ucontext_t *ucontext = (ucontext_t*)context;
+  *pc = ucontext->uc_mcontext.mc_gpregs.gp_elr;
+  *bp = ucontext->uc_mcontext.mc_gpregs.gp_x[29];
+  *sp = ucontext->uc_mcontext.mc_gpregs.gp_sp;
+# else
   ucontext_t *ucontext = (ucontext_t*)context;
   *pc = ucontext->uc_mcontext.pc;
   *bp = ucontext->uc_mcontext.regs[29];
   *sp = ucontext->uc_mcontext.sp;
+# endif
 #elif defined(__hppa__)
   ucontext_t *ucontext = (ucontext_t*)context;
   *pc = ucontext->uc_mcontext.sc_iaoq[0];
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_syscall_generic.inc b/compiler-rt/lib/sanitizer_common/sanitizer_syscall_generic.inc
--- a/compiler-rt/lib/sanitizer_common/sanitizer_syscall_generic.inc
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_syscall_generic.inc
@@ -19,7 +19,8 @@
 # define SYSCALL(name) __NR_ ## name
 #endif
 
-#if defined(__x86_64__) && (SANITIZER_FREEBSD || SANITIZER_MAC)
+#if (defined(__x86_64__) && (SANITIZER_FREEBSD || SANITIZER_MAC)) || \
+    (defined(__aarch64__) && SANITIZER_FREEBSD)
 # define internal_syscall __syscall
 # else
 # define internal_syscall syscall