Initial creation of sourceware repositorygdb-4_18-branchpoint

1 files changed, 453 insertions, 0 deletions

diff --git a/gdb/z8k-tdep.c b/gdb/z8k-tdep.c
new file mode 100644
index 0000000..0b5c1c2
--- /dev/null
+++ b/gdb/z8k-tdep.c
@@ -0,0 +1,453 @@
+/* Target-machine dependent code for Zilog Z8000, for GDB.
+   Copyright (C) 1992, 1993, 1994 Free Software Foundation, Inc.
+
+This file is part of GDB.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+/*
+ Contributed by Steve Chamberlain
+                sac@cygnus.com
+ */
+
+#include "defs.h"
+#include "frame.h"
+#include "obstack.h"
+#include "symtab.h"
+#include "gdbcmd.h"
+#include "gdbtypes.h"
+#include "dis-asm.h"
+#include "gdbcore.h"
+
+
+/* Return the saved PC from this frame.
+
+   If the frame has a memory copy of SRP_REGNUM, use that.  If not,
+   just use the register SRP_REGNUM itself.  */
+
+CORE_ADDR
+frame_saved_pc (frame)
+     struct frame_info *frame;
+{
+  return read_memory_pointer (frame->frame + (BIG ? 4 : 2));
+}
+
+#define IS_PUSHL(x) (BIG ? ((x & 0xfff0) == 0x91e0):((x & 0xfff0) == 0x91F0))
+#define IS_PUSHW(x) (BIG ? ((x & 0xfff0) == 0x93e0):((x & 0xfff0)==0x93f0))
+#define IS_MOVE_FP(x) (BIG ? x == 0xa1ea : x == 0xa1fa)
+#define IS_MOV_SP_FP(x) (BIG ? x == 0x94ea : x == 0x0d76)
+#define IS_SUB2_SP(x) (x==0x1b87)
+#define IS_MOVK_R5(x) (x==0x7905)
+#define IS_SUB_SP(x) ((x & 0xffff) == 0x020f)
+#define IS_PUSH_FP(x) (BIG ? (x == 0x93ea) : (x == 0x93fa))
+
+/* work out how much local space is on the stack and
+   return the pc pointing to the first push */
+
+static CORE_ADDR
+skip_adjust (pc, size)
+     CORE_ADDR pc;
+     int *size;
+{
+  *size = 0;
+
+  if (IS_PUSH_FP (read_memory_short (pc))
+      && IS_MOV_SP_FP (read_memory_short (pc + 2)))
+    {
+      /* This is a function with an explict frame pointer */
+      pc += 4;
+      *size += 2;		/* remember the frame pointer */
+    }
+
+  /* remember any stack adjustment */
+  if (IS_SUB_SP (read_memory_short (pc)))
+    {
+      *size += read_memory_short (pc + 2);
+      pc += 4;
+    }
+  return pc;
+}
+
+static CORE_ADDR examine_frame PARAMS ((CORE_ADDR, CORE_ADDR *regs, CORE_ADDR));
+static CORE_ADDR
+examine_frame (pc, regs, sp)
+     CORE_ADDR pc;
+     CORE_ADDR *regs;
+     CORE_ADDR sp;
+{
+  int w = read_memory_short (pc);
+  int offset = 0;
+  int regno;
+
+  for (regno = 0; regno < NUM_REGS; regno++)
+    regs[regno] = 0;
+
+  while (IS_PUSHW (w) || IS_PUSHL (w))
+    {
+      /* work out which register is being pushed to where */
+      if (IS_PUSHL (w))
+	{
+	  regs[w & 0xf] = offset;
+	  regs[(w & 0xf) + 1] = offset + 2;
+	  offset += 4;
+	}
+      else
+	{
+	  regs[w & 0xf] = offset;
+	  offset += 2;
+	}
+      pc += 2;
+      w = read_memory_short (pc);
+    }
+
+  if (IS_MOVE_FP (w))
+    {
+      /* We know the fp */
+
+    }
+  else if (IS_SUB_SP (w))
+    {
+      /* Subtracting a value from the sp, so were in a function
+       which needs stack space for locals, but has no fp.  We fake up
+       the values as if we had an fp */
+      regs[FP_REGNUM] = sp;
+    }
+  else
+    {
+      /* This one didn't have an fp, we'll fake it up */
+      regs[SP_REGNUM] = sp;
+    }
+  /* stack pointer contains address of next frame */
+  /*  regs[fp_regnum()] = fp;*/
+  regs[SP_REGNUM] = sp;
+  return pc;
+}
+
+CORE_ADDR
+z8k_skip_prologue (start_pc)
+     CORE_ADDR start_pc;
+{
+  CORE_ADDR dummy[NUM_REGS];
+
+  return examine_frame (start_pc, dummy, 0);
+}
+
+CORE_ADDR
+z8k_addr_bits_remove (addr)
+     CORE_ADDR addr;
+{
+  return (addr & PTR_MASK);
+}
+
+int
+read_memory_pointer (x)
+     CORE_ADDR x;
+{
+  return read_memory_integer (ADDR_BITS_REMOVE (x), BIG ? 4 : 2);
+}
+
+CORE_ADDR
+frame_chain (thisframe)
+     struct frame_info *thisframe;
+{
+  if (thisframe->prev == 0)
+    {
+      /* This is the top of the stack, let's get the sp for real */
+    }
+  if (!inside_entry_file (thisframe->pc))
+    {
+      return read_memory_pointer (thisframe->frame);
+    }
+  return 0;
+}
+
+void
+init_frame_pc ()
+{
+  abort ();
+}
+
+/* Put here the code to store, into a struct frame_saved_regs,
+   the addresses of the saved registers of frame described by FRAME_INFO.
+   This includes special registers such as pc and fp saved in special
+   ways in the stack frame.  sp is even more special:
+   the address we return for it IS the sp for the next frame.  */
+
+void
+z8k_frame_init_saved_regs (frame_info)
+     struct frame_info *frame_info;
+{
+  CORE_ADDR pc;
+  int w;
+
+  frame_saved_regs_zalloc (frame_info);
+  pc = get_pc_function_start (frame_info->pc);
+
+  /* wander down the instruction stream */
+  examine_frame (pc, frame_info->saved_regs, frame_info->frame);
+
+}
+
+void
+z8k_push_dummy_frame ()
+{
+  abort ();
+}
+
+int
+gdb_print_insn_z8k (memaddr, info)
+     bfd_vma memaddr;
+     disassemble_info *info;
+{
+  if (BIG)
+    return print_insn_z8001 (memaddr, info);
+  else
+    return print_insn_z8002 (memaddr, info);
+}
+
+/* Fetch the instruction at ADDR, returning 0 if ADDR is beyond LIM or
+   is not the address of a valid instruction, the address of the next
+   instruction beyond ADDR otherwise.  *PWORD1 receives the first word
+   of the instruction.*/
+
+CORE_ADDR
+NEXT_PROLOGUE_INSN (addr, lim, pword1)
+     CORE_ADDR addr;
+     CORE_ADDR lim;
+     short *pword1;
+{
+  char buf[2];
+  if (addr < lim + 8)
+    {
+      read_memory (addr, buf, 2);
+      *pword1 = extract_signed_integer (buf, 2);
+
+      return addr + 2;
+    }
+  return 0;
+}
+
+#if 0
+/* Put here the code to store, into a struct frame_saved_regs,
+   the addresses of the saved registers of frame described by FRAME_INFO.
+   This includes special registers such as pc and fp saved in special
+   ways in the stack frame.  sp is even more special:
+   the address we return for it IS the sp for the next frame.
+
+   We cache the result of doing this in the frame_cache_obstack, since
+   it is fairly expensive.  */
+
+void
+frame_find_saved_regs (fip, fsrp)
+     struct frame_info *fip;
+     struct frame_saved_regs *fsrp;
+{
+  int locals;
+  CORE_ADDR pc;
+  CORE_ADDR adr;
+  int i;
+
+  memset (fsrp, 0, sizeof *fsrp);
+
+  pc = skip_adjust (get_pc_function_start (fip->pc), &locals);
+
+  {
+    adr = FRAME_FP (fip) - locals;
+    for (i = 0; i < 8; i++)
+      {
+	int word = read_memory_short (pc);
+
+	pc += 2;
+	if (IS_PUSHL (word))
+	  {
+	    fsrp->regs[word & 0xf] = adr;
+	    fsrp->regs[(word & 0xf) + 1] = adr - 2;
+	    adr -= 4;
+	  }
+	else if (IS_PUSHW (word))
+	  {
+	    fsrp->regs[word & 0xf] = adr;
+	    adr -= 2;
+	  }
+	else
+	  break;
+      }
+
+  }
+
+  fsrp->regs[PC_REGNUM] = fip->frame + 4;
+  fsrp->regs[FP_REGNUM] = fip->frame;
+
+}
+#endif
+
+int
+saved_pc_after_call ()
+{
+  return ADDR_BITS_REMOVE 
+    (read_memory_integer (read_register (SP_REGNUM), PTR_SIZE));
+}
+
+
+void
+extract_return_value (type, regbuf, valbuf)
+     struct type *type;
+     char *regbuf;
+     char *valbuf;
+{
+  int b;
+  int len = TYPE_LENGTH (type);
+
+  for (b = 0; b < len; b += 2)
+    {
+      int todo = len - b;
+
+      if (todo > 2)
+	todo = 2;
+      memcpy (valbuf + b, regbuf + b, todo);
+    }
+}
+
+void
+write_return_value (type, valbuf)
+     struct type *type;
+     char *valbuf;
+{
+  int reg;
+  int len;
+
+  for (len = 0; len < TYPE_LENGTH (type); len += 2)
+    write_register_bytes (REGISTER_BYTE (len / 2  + 2), valbuf + len, 2);
+}
+
+void
+store_struct_return (addr, sp)
+     CORE_ADDR addr;
+     CORE_ADDR sp;
+{
+  write_register (2, addr);
+}
+
+
+void
+print_register_hook (regno)
+     int regno;
+{
+  if ((regno & 1) == 0 && regno < 16)
+    {
+      unsigned short l[2];
+
+      read_relative_register_raw_bytes (regno, (char *) (l + 0));
+      read_relative_register_raw_bytes (regno + 1, (char *) (l + 1));
+      printf_unfiltered ("\t");
+      printf_unfiltered ("%04x%04x", l[0], l[1]);
+    }
+
+  if ((regno & 3) == 0 && regno < 16)
+    {
+      unsigned short l[4];
+
+      read_relative_register_raw_bytes (regno, (char *) (l + 0));
+      read_relative_register_raw_bytes (regno + 1, (char *) (l + 1));
+      read_relative_register_raw_bytes (regno + 2, (char *) (l + 2));
+      read_relative_register_raw_bytes (regno + 3, (char *) (l + 3));
+
+      printf_unfiltered ("\t");
+      printf_unfiltered ("%04x%04x%04x%04x", l[0], l[1], l[2], l[3]);
+    }
+  if (regno == 15)
+    {
+      unsigned short rval;
+      int i;
+
+      read_relative_register_raw_bytes (regno, (char *) (&rval));
+
+      printf_unfiltered ("\n");
+      for (i = 0; i < 10; i += 2)
+	{
+	  printf_unfiltered ("(sp+%d=%04x)", i, read_memory_short (rval + i));
+	}
+    }
+
+}
+
+void
+z8k_pop_frame ()
+{
+}
+
+struct cmd_list_element *setmemorylist;
+
+void
+z8k_set_pointer_size (newsize)
+     int newsize;
+{
+  static int oldsize = 0;
+
+  if (oldsize != newsize)
+    {
+      printf_unfiltered ("pointer size set to %d bits\n", newsize);
+      oldsize = newsize;
+      if (newsize == 32)
+	{
+	  BIG = 1;
+	}
+      else
+	{
+	  BIG = 0;
+	}
+      _initialize_gdbtypes ();
+    }
+}
+
+static void
+segmented_command (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  z8k_set_pointer_size (32);
+}
+
+static void
+unsegmented_command (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  z8k_set_pointer_size (16);
+}
+
+static void
+set_memory (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  printf_unfiltered ("\"set memory\" must be followed by the name of a memory subcommand.\n");
+  help_list (setmemorylist, "set memory ", -1, gdb_stdout);
+}
+
+void
+_initialize_z8ktdep ()
+{
+  tm_print_insn = gdb_print_insn_z8k;
+
+  add_prefix_cmd ("memory", no_class, set_memory,
+		  "set the memory model", &setmemorylist, "set memory ", 0,
+		  &setlist);
+  add_cmd ("segmented", class_support, segmented_command,
+	   "Set segmented memory model.", &setmemorylist);
+  add_cmd ("unsegmented", class_support, unsegmented_command,
+	   "Set unsegmented memory model.", &setmemorylist);
+
+}