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

diff --git a/gdb/sparc-tdep.c b/gdb/sparc-tdep.c
index 880d2768883fb258dd8c0cc334ec8dcd53dde609..38b345b888dd6a0509638f374d3397ac8b989ac9 100644 (file)
--- a/gdb/sparc-tdep.c
+++ b/gdb/sparc-tdep.c
@@ -1,6 +1,6 @@
 /* Target-dependent code for SPARC.
 
-   Copyright (C) 2003-2013 Free Software Foundation, Inc.
+   Copyright (C) 2003-2014 Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -36,7 +36,7 @@
 #include "value.h"
 
 #include "gdb_assert.h"
-#include "gdb_string.h"
+#include <string.h>
 
 #include "sparc-tdep.h"
 #include "sparc-ravenscar-thread.h"
@@ -121,6 +121,37 @@ sparc_is_unimp_insn (CORE_ADDR pc)
   return ((insn & 0xc1c00000) == 0);
 }
 
+/* Return non-zero if the instruction corresponding to PC is an
+   "annulled" branch, i.e. the annul bit is set.  */
+
+int
+sparc_is_annulled_branch_insn (CORE_ADDR pc)
+{
+  /* The branch instructions featuring an annul bit can be identified
+     by the following bit patterns:
+
+     OP=0
+      OP2=1: Branch on Integer Condition Codes with Prediction (BPcc).
+      OP2=2: Branch on Integer Condition Codes (Bcc).
+      OP2=5: Branch on FP Condition Codes with Prediction (FBfcc).
+      OP2=6: Branch on FP Condition Codes (FBcc).
+      OP2=3 && Bit28=0:
+             Branch on Integer Register with Prediction (BPr).
+
+     This leaves out ILLTRAP (OP2=0), SETHI/NOP (OP2=4) and the V8
+     coprocessor branch instructions (Op2=7).  */
+
+  const unsigned long insn = sparc_fetch_instruction (pc);
+  const unsigned op2 = X_OP2 (insn);
+
+  if ((X_OP (insn) == 0)
+      && ((op2 == 1) || (op2 == 2) || (op2 == 5) || (op2 == 6)
+         || ((op2 == 3) && ((insn & 0x10000000) == 0))))
+    return X_A (insn);
+  else
+    return 0;
+}
+
 /* OpenBSD/sparc includes StackGhost, which according to the author's
    website http://stackghost.cerias.purdue.edu "... transparently and
    automatically protects applications' stack frames; more
@@ -1538,7 +1569,6 @@ sparc_analyze_control_transfer (struct frame_info *frame,
          if (X_A (insn))
            *npc = 0;
 
-         gdb_assert (offset != 0);
          return pc + offset;
        }
     }
@@ -1623,7 +1653,7 @@ sparc32_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
     return arches->gdbarch;
 
   /* Allocate space for the new architecture.  */
-  tdep = XZALLOC (struct gdbarch_tdep);
+  tdep = XCNEW (struct gdbarch_tdep);
   gdbarch = gdbarch_alloc (&info, tdep);
 
   tdep->pc_regnum = SPARC32_PC_REGNUM;