* arm-tdep.c (thumb_get_next_pc): Handle Thumb BLX.

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 52df769..56fc35d 100644 (file)
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,7 @@
+2004-03-09  Daniel Jacobowitz  <drow@mvista.com>
+
+       * arm-tdep.c (thumb_get_next_pc): Handle Thumb BLX.
+
 2004-03-08  Nathan J. Williams  <nathanw@wasabisystems.com>
 
        * MAINTAINERS (write after approval): Add myself.

diff --git a/gdb/arm-tdep.c b/gdb/arm-tdep.c
index 06bfcb6..05c0f23 100644 (file)
--- a/gdb/arm-tdep.c
+++ b/gdb/arm-tdep.c
@@ -1651,13 +1651,16 @@ thumb_get_next_pc (CORE_ADDR pc)
     {
       nextpc = pc_val + (sbits (inst1, 0, 10) << 1);
     }
-  else if ((inst1 & 0xf800) == 0xf000) /* long branch with link */
+  else if ((inst1 & 0xf800) == 0xf000) /* long branch with link, and blx */
     {
       unsigned short inst2 = read_memory_integer (pc + 2, 2);
       offset = (sbits (inst1, 0, 10) << 12) + (bits (inst2, 0, 10) << 1);
       nextpc = pc_val + offset;
+      /* For BLX make sure to clear the low bits.  */
+      if (bits (inst2, 11, 12) == 1)
+       nextpc = nextpc & 0xfffffffc;
     }
-  else if ((inst1 & 0xff80) == 0x4700) /* branch and exchange (bx) */
+  else if ((inst1 & 0xff00) == 0x4700) /* bx REG, blx REG */
     {
       if (bits (inst1, 3, 6) == 0x0f)
        nextpc = pc_val;