Index: lib/asan/asan_linux.cc
===================================================================
--- lib/asan/asan_linux.cc
+++ lib/asan/asan_linux.cc
@@ -46,16 +46,62 @@
 #include <link.h>
 #endif
 
-// x86_64 FreeBSD 9.2 and older define 64-bit register names in both 64-bit
-// and 32-bit modes.
-#if SANITIZER_FREEBSD
+// x86-64 FreeBSD 9.2 and older define 'ucontext_t' incorrectly in
+// 32-bit mode.
+#if SANITIZER_FREEBSD && (SANITIZER_WORDSIZE == 32)
 #include <sys/param.h>
 # if __FreeBSD_version <= 902001  // v9.2
-#  define mc_eip mc_rip
-#  define mc_ebp mc_rbp
-#  define mc_esp mc_rsp
-# endif
-#endif
+typedef __int32_t __xregister_t;
+
+typedef struct __xmcontext {
+  __xregister_t mc_onstack;
+  __xregister_t mc_gs;
+  __xregister_t mc_fs;
+  __xregister_t mc_es;
+  __xregister_t mc_ds;
+  __xregister_t mc_edi;
+  __xregister_t mc_esi;
+  __xregister_t mc_ebp;
+  __xregister_t mc_isp;
+  __xregister_t mc_ebx;
+  __xregister_t mc_edx;
+  __xregister_t mc_ecx;
+  __xregister_t mc_eax;
+  __xregister_t mc_trapno;
+  __xregister_t mc_err;
+  __xregister_t mc_eip;
+  __xregister_t mc_cs;
+  __xregister_t mc_eflags;
+  __xregister_t mc_esp;
+  __xregister_t mc_ss;
+
+  int mc_len;
+  int mc_fpformat;
+  int mc_ownedfp;
+  __xregister_t mc_flags;
+
+  int mc_fpstate[128] __aligned(16);
+  __xregister_t mc_fsbase;
+  __xregister_t mc_gsbase;
+  __xregister_t mc_xfpustate;
+  __xregister_t mc_xfpustate_len;
+
+  int mc_spare2[4];
+} xmcontext_t;
+
+typedef struct __xucontext {
+  sigset_t  uc_sigmask;
+  xmcontext_t  uc_mcontext;
+
+  struct __ucontext *uc_link;
+  stack_t uc_stack;
+  int uc_flags;
+  int __spare__[4];
+} xucontext_t;
+
+# define ucontext_t xucontext_t
+# endif  // __FreeBSD_version <= 902001
+#endif  // SANITIZER_FREEBSD && (SANITIZER_WORDSIZE == 32)
 
 typedef enum {
   ASAN_RT_VERSION_UNDEFINED = 0,