diff --git a/sim/mips/configure.in b/sim/mips/configure.in
index 1ffee3caeea..a417a48ab06 100644
--- a/sim/mips/configure.in
+++ b/sim/mips/configure.in
@@ -27,6 +27,14 @@ case "${target}" in
 esac
 AC_SUBST(SIMCONF)
 
+case "${target}" in
+# start-sanitize-tx19
+  mipstx19*-*-*)        SIM_SUBTARGET="-DSUBTARGET_R3900=1";;
+# end-sanitize-tx19
+  *)                    SIM_SUBTARGET="";;
+esac
+AC_SUBST(SIM_SUBTARGET)
+
 AC_CHECK_HEADERS(string.h strings.h stdlib.h stdlib.h)
 AC_CHECK_LIB(m, fabs)
 AC_CHECK_FUNCS(aint anint sqrt)
diff --git a/sim/mips/gencode.c b/sim/mips/gencode.c
index 2f8e60e9ec9..7f0269f4409 100644
--- a/sim/mips/gencode.c
+++ b/sim/mips/gencode.c
@@ -290,6 +290,7 @@ typedef enum {
  SHIFT,                 /* perform a logical or arithmetic shift */
  TRAP,                  /* system exception generation */
  BREAK,                 /* system breakpoint exception generation */
+ SDBBP,                 /* software debug breakpoint exception generation */
  SYSCALL,               /* system exception generation */
  SYNC,                  /* system cache control */
  DECODE,                /* co-processor instruction */
@@ -823,6 +824,7 @@ struct instruction MIPS_DECODE[] = {
  {"SCD",     3,"111100sssssgggggeeeeeeeeeeeeeeee",NORMAL, STORE,    (DOUBLEWORD | ATOMIC)},
  {"SD",      3,"111111sssssgggggeeeeeeeeeeeeeeee",NORMAL, STORE,    (DOUBLEWORD)},
  {"SDC1",    2,"111101sssssttttteeeeeeeeeeeeeeee",NORMAL, STORE,    (DOUBLEWORD | COPROC)},
+ {"SDBBP",  T3,"000000????????????????????001110",SPECIAL,SDBBP,    (NOARG)},
  {"SDC2",    2,"111110sssssttttteeeeeeeeeeeeeeee",NORMAL, STORE,    (DOUBLEWORD | COPROC)},
  {"SDL",     3,"101100sssssgggggyyyyyyyyyyyyyyyy",NORMAL, STORE,    (DOUBLEWORD | LEFT)},
  {"SDR",     3,"101101sssssgggggyyyyyyyyyyyyyyyy",NORMAL, STORE,    (DOUBLEWORD | RIGHT)},
@@ -941,6 +943,7 @@ static const struct instruction MIPS16_DECODE[] = {
 {"NOT",     1, "11101dddyyy01111Z", RR,      OR,      NOT },
 {"OR",      1, "11101wwwyyy01101",  RR,      OR,      NONE },
 {"SB",      1, "11000xxxyyy55555",  RRI,     STORE,   BYTE },
+{"SDBBP",  T3, "11100??????00001",  RR,      SDBBP,   NOARG },
 {"SD",      3, "01111xxxyyyDDDDD",  RRI,     STORE,   DOUBLEWORD },
 {"SDSP",    3, "11111001yyyDDDDDs", RI64,    STORE,   DOUBLEWORD },
 {"SDRASP",  3, "11111010CCCCCCCCsQ", I64,    STORE,   DOUBLEWORD },
@@ -2418,6 +2421,10 @@ build_instruction (doisa, features, mips16, insn)
      printf("   SignalException(BreakPoint,instruction);\n");
      break ;
 
+    case SDBBP:
+     printf("   SignalException(DebugBreakPoint,instruction);\n");
+     break ;
+
     case TRAP:
      {
       int boolNOT = (insn->flags & NOT);
@@ -4493,10 +4500,3 @@ my_strtoul(nptr, endptr, base)
 /*---------------------------------------------------------------------------*/
 
 /*> EOF gencode.c <*/
-
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