* breakpoint.c, breakpoint.h (breakpoint_init_inferior): New function

[deliverable/binutils-gdb.git] / gdb / rs6000-tdep.c

diff --git a/gdb/rs6000-tdep.c b/gdb/rs6000-tdep.c
index 94aadf24d99caea1fe0d8fc60a61563ca285ebab..012f53b37b68539c925c83473871dec04df6dd3b 100644 (file)
--- a/gdb/rs6000-tdep.c
+++ b/gdb/rs6000-tdep.c
@@ -106,8 +106,15 @@ branch_dest (opcode, instr, pc, safety)
          dest = read_register (LR_REGNUM) & ~3;
 
        else if (ext_op == 528)                 /* br cond to count reg */
-         dest = read_register (CTR_REGNUM) & ~3;
-
+         {
+           dest = read_register (CTR_REGNUM) & ~3;
+
+           /* If we are about to execute a system call, dest is something
+              like 0x22fc or 0x3b00.  Upon completion the system call
+              will return to the address in the link register.  */
+           if (dest < TEXT_SEGMENT_BASE)
+             dest = read_register (LR_REGNUM) & ~3;
+         }
        else return -1; 
        break;
        
@@ -180,12 +187,13 @@ single_step (signal)
 skip_prologue (pc)
 CORE_ADDR pc;
 {
+  char buf[4];
   unsigned int tmp;
-  unsigned int op;    /* FIXME, assumes instruction size matches host int!!! */
+  unsigned long op;
 
-  if (target_read_memory (pc, (char *)&op, sizeof (op)))
+  if (target_read_memory (pc, buf, 4))
     return pc;                 /* Can't access it -- assume no prologue. */
-  SWAP_TARGET_AND_HOST (&op, sizeof (op));
+  op = extract_unsigned_integer (buf, 4);
 
   /* Assume that subsequent fetches can fail with low probability.  */
 
@@ -738,8 +746,8 @@ push_arguments (nargs, args, sp, struct_return, struct_addr)
         printf (
 "Fatal Error: a floating point parameter #%d with a size > 8 is found!\n", argno);
 
-      bcopy (VALUE_CONTENTS (arg), 
-         &registers[REGISTER_BYTE(FP0_REGNUM + 1 + f_argno)], len);
+      memcpy (&registers[REGISTER_BYTE(FP0_REGNUM + 1 + f_argno)], VALUE_CONTENTS (arg), 
+         len);
       ++f_argno;
     }
 
@@ -749,8 +757,8 @@ push_arguments (nargs, args, sp, struct_return, struct_addr)
       while (argbytes < len) {
 
        *(int*)&registers[REGISTER_BYTE(ii+3)] = 0;
-       bcopy ( ((char*)VALUE_CONTENTS (arg))+argbytes, 
-                       &registers[REGISTER_BYTE(ii+3)], 
+       memcpy (&registers[REGISTER_BYTE(ii+3)], 
+                        ((char*)VALUE_CONTENTS (arg))+argbytes, 
                        (len - argbytes) > 4 ? 4 : len - argbytes);
        ++ii, argbytes += 4;
 
@@ -762,7 +770,7 @@ push_arguments (nargs, args, sp, struct_return, struct_addr)
     }
     else {        /* Argument can fit in one register. No problem. */
       *(int*)&registers[REGISTER_BYTE(ii+3)] = 0;
-      bcopy (VALUE_CONTENTS (arg), &registers[REGISTER_BYTE(ii+3)], len);
+      memcpy (&registers[REGISTER_BYTE(ii+3)], VALUE_CONTENTS (arg), len);
     }
     ++argno;
   }
@@ -829,8 +837,8 @@ ran_out_of_registers_for_arguments:
           printf (
 "Fatal Error: a floating point parameter #%d with a size > 8 is found!\n", argno);
 
-        bcopy (VALUE_CONTENTS (arg), 
-           &registers[REGISTER_BYTE(FP0_REGNUM + 1 + f_argno)], len);
+        memcpy (&registers[REGISTER_BYTE(FP0_REGNUM + 1 + f_argno)], VALUE_CONTENTS (arg), 
+           len);
         ++f_argno;
       }
 
@@ -870,17 +878,17 @@ extract_return_value (valtype, regbuf, valbuf)
        necessary. */
 
     if (TYPE_LENGTH (valtype) > 4)             /* this is a double */
-      bcopy (&regbuf[REGISTER_BYTE (FP0_REGNUM + 1)], valbuf, 
+      memcpy (valbuf, &regbuf[REGISTER_BYTE (FP0_REGNUM + 1)],
                                                TYPE_LENGTH (valtype));
     else {             /* float */
-      bcopy (&regbuf[REGISTER_BYTE (FP0_REGNUM + 1)], &dd, 8);
+      memcpy (&dd, &regbuf[REGISTER_BYTE (FP0_REGNUM + 1)], 8);
       ff = (float)dd;
-      bcopy (&ff, valbuf, sizeof(float));
+      memcpy (valbuf, &ff, sizeof(float));
     }
   }
   else
     /* return value is copied starting from r3. */
-    bcopy (&regbuf[REGISTER_BYTE (3)], valbuf, TYPE_LENGTH (valtype));
+    memcpy (valbuf, &regbuf[REGISTER_BYTE (3)], TYPE_LENGTH (valtype));
 }
 
 
@@ -892,23 +900,6 @@ extract_return_value (valtype, regbuf, valbuf)
 CORE_ADDR rs6000_struct_return_address;
 
 
-/* Throw away this debugging code. FIXMEmgo. */
-void
-print_frame(fram)
-int fram;
-{
-  int ii, val;
-  for (ii=0; ii<40; ++ii) {
-    if ((ii % 4) == 0)
-      printf ("\n");
-    val = read_memory_integer (fram + ii * 4, 4);
-    printf ("0x%08x\t", val);
-  }
-  printf ("\n");
-}
-
-
-
 /* Indirect function calls use a piece of trampoline code to do context
    switching, i.e. to set the new TOC table. Skip such code if we are on
    its first instruction (as when we have single-stepped to here). 
@@ -956,6 +947,12 @@ int pcsaved;
   CORE_ADDR func_start;
   struct aix_framedata fdata;
 
+  if (fi->next != NULL)
+    /* Don't even think about framelessness except on the innermost frame.  */
+    /* FIXME: Can also be frameless if fi->next->signal_handler_caller (if
+       a signal happens while executing in a frameless function).  */
+    return 0;
+  
   func_start = get_pc_function_start (fi->pc) + FUNCTION_START_OFFSET;
 
   /* If we failed to find the start of the function, it is a mistake
@@ -992,7 +989,7 @@ frame_get_cache_fsr (fi, fdatap)
 
   fi->cache_fsr = (struct frame_saved_regs *)
       obstack_alloc (&frame_cache_obstack, sizeof (struct frame_saved_regs));
-  bzero (fi->cache_fsr, sizeof (struct frame_saved_regs));
+  memset (fi->cache_fsr, '\0', sizeof (struct frame_saved_regs));
 
   if (fi->prev && fi->prev->frame)
     frame_addr = fi->prev->frame;
@@ -1087,6 +1084,32 @@ frame_initial_stack_address (fi)
   return fi->initial_sp = read_register (fdata.alloca_reg);     
 }
 
+FRAME_ADDR
+rs6000_frame_chain (thisframe)
+     struct frame_info *thisframe;
+{
+  FRAME_ADDR fp;
+  if (inside_entry_file ((thisframe)->pc))
+    return 0;
+  if (thisframe->signal_handler_caller)
+    {
+      /* This was determined by experimentation on AIX 3.2.  Perhaps
+        it corresponds to some offset in /usr/include/sys/user.h or
+        something like that.  Using some system include file would
+        have the advantage of probably being more robust in the face
+        of OS upgrades, but the disadvantage of being wrong for
+        cross-debugging.  */
+
+#define SIG_FRAME_FP_OFFSET 284
+      fp = read_memory_integer (thisframe->frame + SIG_FRAME_FP_OFFSET, 4);
+    }
+  else
+    fp = read_memory_integer ((thisframe)->frame, 4);
+
+  return fp;
+}
+
+\f
 /* xcoff_relocate_symtab -     hook for symbol table relocation.
    also reads shared libraries.. */