gdb/doc:

[deliverable/binutils-gdb.git] / gdb / sparc-tdep.c

diff --git a/gdb/sparc-tdep.c b/gdb/sparc-tdep.c
index 24d54b741723dd4d6aaaea00adceab840e157001..6da2297a3cb9547ab8c48f8e4e8947fd2cc13ad9 100644 (file)
--- a/gdb/sparc-tdep.c
+++ b/gdb/sparc-tdep.c
@@ -85,6 +85,7 @@ struct regset;
 /* Sign extension macros.  */
 #define X_DISP22(i) ((X_IMM22 (i) ^ 0x200000) - 0x200000)
 #define X_DISP19(i) ((((i) & 0x7ffff) ^ 0x40000) - 0x40000)
+#define X_DISP10(i) ((((((i) >> 11) && 0x300) | (((i) >> 5) & 0xff)) ^ 0x200) - 0x200)
 #define X_SIMM13(i) ((((i) & 0x1fff) ^ 0x1000) - 0x1000)
 
 /* Fetch the instruction at PC.  Instructions are always big-endian
@@ -601,7 +602,6 @@ static struct sparc_frame_cache *
 sparc_alloc_frame_cache (void)
 {
   struct sparc_frame_cache *cache;
-  int i;
 
   cache = FRAME_OBSTACK_ZALLOC (struct sparc_frame_cache);
 
@@ -1353,7 +1353,7 @@ sparc32_store_return_value (struct type *type, struct regcache *regcache,
 }
 
 static enum return_value_convention
-sparc32_return_value (struct gdbarch *gdbarch, struct type *func_type,
+sparc32_return_value (struct gdbarch *gdbarch, struct value *function,
                      struct type *type, struct regcache *regcache,
                      gdb_byte *readbuf, const gdb_byte *writebuf)
 {
@@ -1451,14 +1451,24 @@ sparc_analyze_control_transfer (struct frame_info *frame,
 {
   unsigned long insn = sparc_fetch_instruction (pc);
   int conditional_p = X_COND (insn) & 0x7;
-  int branch_p = 0;
+  int branch_p = 0, fused_p = 0;
   long offset = 0;                     /* Must be signed for sign-extend.  */
 
-  if (X_OP (insn) == 0 && X_OP2 (insn) == 3 && (insn & 0x1000000) == 0)
+  if (X_OP (insn) == 0 && X_OP2 (insn) == 3)
     {
-      /* Branch on Integer Register with Prediction (BPr).  */
-      branch_p = 1;
-      conditional_p = 1;
+      if ((insn & 0x10000000) == 0)
+       {
+         /* Branch on Integer Register with Prediction (BPr).  */
+         branch_p = 1;
+         conditional_p = 1;
+       }
+      else
+       {
+         /* Compare and Branch  */
+         branch_p = 1;
+         fused_p = 1;
+         offset = 4 * X_DISP10 (insn);
+       }
     }
   else if (X_OP (insn) == 0 && X_OP2 (insn) == 6)
     {
@@ -1495,7 +1505,16 @@ sparc_analyze_control_transfer (struct frame_info *frame,
 
   if (branch_p)
     {
-      if (conditional_p)
+      if (fused_p)
+       {
+         /* Fused compare-and-branch instructions are non-delayed,
+            and do not have an annuling capability.  So we need to
+            always set a breakpoint on both the NPC and the branch
+            target address.  */
+         gdb_assert (offset != 0);
+         return pc + offset;
+       }
+      else if (conditional_p)
        {
          /* For conditional branches, return nPC + 4 iff the annul
             bit is 1.  */