Initial creation of sourceware repositorygdb-4_18-branchpoint

1 files changed, 653 insertions, 0 deletions

diff --git a/gdb/h8500-tdep.c b/gdb/h8500-tdep.c
new file mode 100644
index 0000000..49fab2d
--- /dev/null
+++ b/gdb/h8500-tdep.c
@@ -0,0 +1,653 @@
+/* Target-dependent code for Hitachi H8/500, for GDB.
+   Copyright 1993, 1994, 1995 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 "gdbtypes.h"
+#include "gdbcmd.h"
+#include "value.h"
+#include "dis-asm.h"
+#include "gdbcore.h"
+
+#define UNSIGNED_SHORT(X) ((X) & 0xffff)
+
+static int code_size = 2;
+
+static int data_size = 2;
+
+/* Shape of an H8/500 frame :
+
+   arg-n
+   ..
+   arg-2
+   arg-1
+   return address <2 or 4 bytes>
+   old fp	  <2 bytes>
+   auto-n
+   ..
+   auto-1
+   saved registers
+
+*/
+
+/* an easy to debug H8 stack frame looks like:
+0x6df6		push	r6
+0x0d76  	mov.w   r7,r6
+0x6dfn          push    reg
+0x7905 nnnn  	mov.w  #n,r5    or   0x1b87  subs #2,sp
+0x1957       	sub.w  r5,sp
+
+ */
+
+#define IS_PUSH(x) (((x) & 0xff00)==0x6d00)
+#define IS_LINK_8(x) ((x) == 0x17)
+#define IS_LINK_16(x) ((x) == 0x1f)
+#define IS_MOVE_FP(x) ((x) == 0x0d76)
+#define IS_MOV_SP_FP(x) ((x) == 0x0d76)
+#define IS_SUB2_SP(x) ((x) == 0x1b87)
+#define IS_MOVK_R5(x) ((x) == 0x7905)
+#define IS_SUB_R5SP(x) ((x) == 0x1957)
+
+#define LINK_8 0x17
+#define LINK_16 0x1f
+
+int minimum_mode = 1;
+
+CORE_ADDR
+h8500_skip_prologue (start_pc)
+     CORE_ADDR start_pc;
+{
+  short int w;
+
+  w = read_memory_integer (start_pc, 1);
+  if (w == LINK_8)
+    {
+      start_pc += 2;
+      w = read_memory_integer (start_pc, 1);
+    }
+
+  if (w == LINK_16)
+    {
+      start_pc += 3;
+      w = read_memory_integer (start_pc, 2);
+    }
+
+  return start_pc;
+}
+
+CORE_ADDR
+h8500_addr_bits_remove (addr)
+     CORE_ADDR addr;
+{
+  return ((addr) & 0xffffff);
+}
+
+/* Given a GDB frame, determine the address of the calling function's frame.
+   This will be used to create a new GDB frame struct, and then
+   INIT_EXTRA_FRAME_INFO and INIT_FRAME_PC will be called for the new frame.
+
+   For us, the frame address is its stack pointer value, so we look up
+   the function prologue to determine the caller's sp value, and return it.  */
+
+CORE_ADDR
+h8500_frame_chain (thisframe)
+     struct frame_info *thisframe;
+{
+  if (!inside_entry_file (thisframe->pc))
+    return (read_memory_integer (FRAME_FP (thisframe), PTR_SIZE));
+  else
+    return 0;
+}
+
+/* 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;
+     char *pword1;
+{
+  if (addr < lim + 8)
+    {
+      read_memory (addr, pword1, 1);
+      read_memory (addr, pword1 + 1, 1);
+      return 1;
+    }
+  return 0;
+}
+
+/* Examine the prologue of a function.  `ip' points to the first
+   instruction.  `limit' is the limit of the prologue (e.g. the addr
+   of the first linenumber, or perhaps the program counter if we're
+   stepping through).  `frame_sp' is the stack pointer value in use in
+   this frame.  `fsr' is a pointer to a frame_saved_regs structure
+   into which we put info about the registers saved by this frame.
+   `fi' is a struct frame_info pointer; we fill in various fields in
+   it to reflect the offsets of the arg pointer and the locals
+   pointer.  */
+
+/* Return the saved PC from this frame. */
+
+CORE_ADDR
+frame_saved_pc (frame)
+     struct frame_info *frame;
+{
+  return read_memory_integer (FRAME_FP (frame) + 2, PTR_SIZE);
+}
+
+void 
+h8500_pop_frame ()
+{
+  unsigned regnum;
+  struct frame_saved_regs fsr;
+  struct frame_info *frame = get_current_frame ();
+
+  get_frame_saved_regs (frame, &fsr);
+
+  for (regnum = 0; regnum < 8; regnum++)
+    {
+      if (fsr.regs[regnum])
+	write_register (regnum, read_memory_short (fsr.regs[regnum]));
+
+      flush_cached_frames ();
+    }
+}
+
+void
+print_register_hook (regno)
+     int regno;
+{
+  if (regno == CCR_REGNUM)
+    {
+      /* CCR register */
+
+      int C, Z, N, V;
+      unsigned char b[2];
+      unsigned char l;
+
+      read_relative_register_raw_bytes (regno, b);
+      l = b[1];
+      printf_unfiltered ("\t");
+      printf_unfiltered ("I-%d - ", (l & 0x80) != 0);
+      N = (l & 0x8) != 0;
+      Z = (l & 0x4) != 0;
+      V = (l & 0x2) != 0;
+      C = (l & 0x1) != 0;
+      printf_unfiltered ("N-%d ", N);
+      printf_unfiltered ("Z-%d ", Z);
+      printf_unfiltered ("V-%d ", V);
+      printf_unfiltered ("C-%d ", C);
+      if ((C | Z) == 0)
+	printf_unfiltered ("u> ");
+      if ((C | Z) == 1)
+	printf_unfiltered ("u<= ");
+      if ((C == 0))
+	printf_unfiltered ("u>= ");
+      if (C == 1)
+	printf_unfiltered ("u< ");
+      if (Z == 0)
+	printf_unfiltered ("!= ");
+      if (Z == 1)
+	printf_unfiltered ("== ");
+      if ((N ^ V) == 0)
+	printf_unfiltered (">= ");
+      if ((N ^ V) == 1)
+	printf_unfiltered ("< ");
+      if ((Z | (N ^ V)) == 0)
+	printf_unfiltered ("> ");
+      if ((Z | (N ^ V)) == 1)
+	printf_unfiltered ("<= ");
+    }
+}
+
+int
+h8500_register_size (regno)
+     int regno;
+{
+  switch (regno)
+    {
+    case SEG_C_REGNUM:
+    case SEG_D_REGNUM:
+    case SEG_E_REGNUM:
+    case SEG_T_REGNUM:
+      return 1;
+    case R0_REGNUM:
+    case R1_REGNUM:
+    case R2_REGNUM:
+    case R3_REGNUM:
+    case R4_REGNUM:
+    case R5_REGNUM:
+    case R6_REGNUM:
+    case R7_REGNUM:
+    case CCR_REGNUM:
+      return 2;
+
+    case PR0_REGNUM:
+    case PR1_REGNUM:
+    case PR2_REGNUM:
+    case PR3_REGNUM:
+    case PR4_REGNUM:
+    case PR5_REGNUM:
+    case PR6_REGNUM:
+    case PR7_REGNUM:
+    case PC_REGNUM:
+      return 4;
+    default:
+      abort ();
+    }
+}
+
+struct type *
+h8500_register_virtual_type (regno)
+     int regno;
+{
+  switch (regno)
+    {
+    case SEG_C_REGNUM:
+    case SEG_E_REGNUM:
+    case SEG_D_REGNUM:
+    case SEG_T_REGNUM:
+      return builtin_type_unsigned_char;
+    case R0_REGNUM:
+    case R1_REGNUM:
+    case R2_REGNUM:
+    case R3_REGNUM:
+    case R4_REGNUM:
+    case R5_REGNUM:
+    case R6_REGNUM:
+    case R7_REGNUM:
+    case CCR_REGNUM:
+      return builtin_type_unsigned_short;
+    case PR0_REGNUM:
+    case PR1_REGNUM:
+    case PR2_REGNUM:
+    case PR3_REGNUM:
+    case PR4_REGNUM:
+    case PR5_REGNUM:
+    case PR6_REGNUM:
+    case PR7_REGNUM:
+    case PC_REGNUM:
+      return builtin_type_unsigned_long;
+    default:
+      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
+frame_find_saved_regs (frame_info, frame_saved_regs)
+     struct frame_info *frame_info;
+     struct frame_saved_regs *frame_saved_regs;
+{
+  register int regnum;
+  register int regmask;
+  register CORE_ADDR next_addr;
+  register CORE_ADDR pc;
+  unsigned char thebyte;
+
+  memset (frame_saved_regs, '\0', sizeof *frame_saved_regs);
+
+  if ((frame_info)->pc >= (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM * 4 - 4
+      && (frame_info)->pc <= (frame_info)->frame)
+    {
+      next_addr = (frame_info)->frame;
+      pc = (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM * 4 - 4;
+    }
+  else
+    {
+      pc = get_pc_function_start ((frame_info)->pc);
+      /* Verify we have a link a6 instruction next;
+	 if not we lose.  If we win, find the address above the saved
+	 regs using the amount of storage from the link instruction.
+	 */
+
+      thebyte = read_memory_integer (pc, 1);
+      if (0x1f == thebyte)
+	next_addr = (frame_info)->frame + read_memory_integer (pc += 1, 2), pc += 2;
+      else if (0x17 == thebyte)
+	next_addr = (frame_info)->frame + read_memory_integer (pc += 1, 1), pc += 1;
+      else
+	goto lose;
+#if 0
+      /* FIXME steve */
+      /* If have an add:g.waddal #-n, sp next, adjust next_addr.  */
+      if ((0x0c0177777 & read_memory_integer (pc, 2)) == 0157774)
+	next_addr += read_memory_integer (pc += 2, 4), pc += 4;
+#endif
+    }
+
+  thebyte = read_memory_integer (pc, 1);
+  if (thebyte == 0x12)
+    {
+      /* Got stm */
+      pc++;
+      regmask = read_memory_integer (pc, 1);
+      pc++;
+      for (regnum = 0; regnum < 8; regnum++, regmask >>= 1)
+	{
+	  if (regmask & 1)
+	    {
+	      (frame_saved_regs)->regs[regnum] = (next_addr += 2) - 2;
+	    }
+	}
+      thebyte = read_memory_integer (pc, 1);
+    }
+  /* Maybe got a load of pushes */
+  while (thebyte == 0xbf)
+    {
+      pc++;
+      regnum = read_memory_integer (pc, 1) & 0x7;
+      pc++;
+      (frame_saved_regs)->regs[regnum] = (next_addr += 2) - 2;
+      thebyte = read_memory_integer (pc, 1);
+    }
+
+lose:;
+
+  /* Remember the address of the frame pointer */
+  (frame_saved_regs)->regs[FP_REGNUM] = (frame_info)->frame;
+
+  /* This is where the old sp is hidden */
+  (frame_saved_regs)->regs[SP_REGNUM] = (frame_info)->frame;
+
+  /* And the PC - remember the pushed FP is always two bytes long */
+  (frame_saved_regs)->regs[PC_REGNUM] = (frame_info)->frame + 2;
+}
+
+CORE_ADDR
+saved_pc_after_call ()
+{
+  int x;
+  int a = read_register (SP_REGNUM);
+
+  x = read_memory_integer (a, code_size);
+  if (code_size == 2)
+    {
+      /* Stick current code segement onto top */
+      x &= 0xffff;
+      x |= read_register (SEG_C_REGNUM) << 16;
+    }
+  x &= 0xffffff;
+  return x;
+}
+
+void
+h8500_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)
+	{
+	  minimum_mode = 0;
+	}
+      else
+	{
+	  minimum_mode = 1;
+	}
+      _initialize_gdbtypes ();
+    }
+}
+
+static void
+big_command ()
+{
+  h8500_set_pointer_size (32);
+  code_size = 4;
+  data_size = 4;
+}
+
+static void
+medium_command ()
+{
+  h8500_set_pointer_size (32);
+  code_size = 4;
+  data_size = 2;
+}
+
+static void
+compact_command ()
+{
+  h8500_set_pointer_size (32);
+  code_size = 2;
+  data_size = 4;
+}
+
+static void
+small_command ()
+{
+  h8500_set_pointer_size (16);
+  code_size = 2;
+  data_size = 2;
+}
+
+static struct cmd_list_element *setmemorylist;
+
+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);
+}
+
+/* See if variable name is ppc or pr[0-7] */
+
+int
+h8500_is_trapped_internalvar (name)
+     char *name;
+{
+  if (name[0] != 'p')
+    return 0;
+
+  if (strcmp (name + 1, "pc") == 0)
+    return 1;
+
+  if (name[1] == 'r'
+      && name[2] >= '0'
+      && name[2] <= '7'
+      && name[3] == '\000')
+    return 1;
+  else
+    return 0;
+}
+
+value_ptr
+h8500_value_of_trapped_internalvar (var)
+     struct internalvar *var;
+{
+  LONGEST regval;
+  unsigned char regbuf[4];
+  int page_regnum, regnum;
+
+  regnum = var->name[2] == 'c' ? PC_REGNUM : var->name[2] - '0';
+
+  switch (var->name[2])
+    {
+    case 'c':
+      page_regnum = SEG_C_REGNUM;
+      break;
+    case '0':
+    case '1':
+    case '2':
+    case '3':
+      page_regnum = SEG_D_REGNUM;
+      break;
+    case '4':
+    case '5':
+      page_regnum = SEG_E_REGNUM;
+      break;
+    case '6':
+    case '7':
+      page_regnum = SEG_T_REGNUM;
+      break;
+    }
+
+  get_saved_register (regbuf, NULL, NULL, selected_frame, page_regnum, NULL);
+  regval = regbuf[0] << 16;
+
+  get_saved_register (regbuf, NULL, NULL, selected_frame, regnum, NULL);
+  regval |= regbuf[0] << 8 | regbuf[1];	/* XXX host/target byte order */
+
+  free (var->value);		/* Free up old value */
+
+  var->value = value_from_longest (builtin_type_unsigned_long, regval);
+  release_value (var->value);	/* Unchain new value */
+
+  VALUE_LVAL (var->value) = lval_internalvar;
+  VALUE_INTERNALVAR (var->value) = var;
+  return var->value;
+}
+
+void
+h8500_set_trapped_internalvar (var, newval, bitpos, bitsize, offset)
+     struct internalvar *var;
+     int offset, bitpos, bitsize;
+     value_ptr newval;
+{
+  char *page_regnum, *regnum;
+  char expression[100];
+  unsigned new_regval;
+  struct type *type;
+  enum type_code newval_type_code;
+
+  type = check_typedef (VALUE_TYPE (newval));
+  newval_type_code = TYPE_CODE (type);
+
+  if ((newval_type_code != TYPE_CODE_INT
+       && newval_type_code != TYPE_CODE_PTR)
+      || TYPE_LENGTH (type) != sizeof (new_regval))
+    error ("Illegal type (%s) for assignment to $%s\n",
+	   TYPE_NAME (VALUE_TYPE (newval)), var->name);
+
+  new_regval = *(long *) VALUE_CONTENTS_RAW (newval);
+
+  regnum = var->name + 1;
+
+  switch (var->name[2])
+    {
+    case 'c':
+      page_regnum = "cp";
+      break;
+    case '0':
+    case '1':
+    case '2':
+    case '3':
+      page_regnum = "dp";
+      break;
+    case '4':
+    case '5':
+      page_regnum = "ep";
+      break;
+    case '6':
+    case '7':
+      page_regnum = "tp";
+      break;
+    }
+
+  sprintf (expression, "$%s=%d", page_regnum, new_regval >> 16);
+  parse_and_eval (expression);
+
+  sprintf (expression, "$%s=%d", regnum, new_regval & 0xffff);
+  parse_and_eval (expression);
+}
+
+CORE_ADDR
+h8500_read_sp ()
+{
+  return read_register (PR7_REGNUM);
+}
+
+void
+h8500_write_sp (v)
+     CORE_ADDR v;
+{
+  write_register (PR7_REGNUM, v);
+}
+
+CORE_ADDR
+h8500_read_pc (pid)
+     int pid;
+{
+  return read_register (PC_REGNUM);
+}
+
+void
+h8500_write_pc (v, pid)
+     CORE_ADDR v;
+     int pid;
+{
+  write_register (PC_REGNUM, v);
+}
+
+CORE_ADDR
+h8500_read_fp ()
+{
+  return read_register (PR6_REGNUM);
+}
+
+void
+h8500_write_fp (v)
+     CORE_ADDR v;
+{
+  write_register (PR6_REGNUM, v);
+}
+
+void
+_initialize_h8500_tdep ()
+{
+  tm_print_insn = print_insn_h8500;
+
+  add_prefix_cmd ("memory", no_class, set_memory,
+		  "set the memory model", &setmemorylist, "set memory ", 0,
+		  &setlist);
+
+  add_cmd ("small", class_support, small_command,
+	   "Set small memory model. (16 bit code, 16 bit data)", &setmemorylist);
+
+  add_cmd ("big", class_support, big_command,
+	   "Set big memory model. (32 bit code, 32 bit data)", &setmemorylist);
+
+  add_cmd ("medium", class_support, medium_command,
+	   "Set medium memory model. (32 bit code, 16 bit data)", &setmemorylist);
+
+  add_cmd ("compact", class_support, compact_command,
+	   "Set compact memory model. (16 bit code, 32 bit data)", &setmemorylist);
+
+}