Initial revision

1 files changed, 295 insertions, 0 deletions

diff --git a/gdb/w65-tdep.c b/gdb/w65-tdep.c
new file mode 100644
index 00000000000..9546616af4e
--- /dev/null
+++ b/gdb/w65-tdep.c
@@ -0,0 +1,295 @@
+/* Target-machine dependent code for WDC-65816, for GDB.
+   Copyright (C) 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 "gdbcmd.h"
+#include "gdbtypes.h"
+#include "dis-asm.h"
+#include "gdbcore.h"
+
+/* Return the saved PC from this frame. */
+
+
+CORE_ADDR
+w65_frame_saved_pc (frame)
+     struct frame_info *frame;
+{
+  return (read_memory_integer (frame->frame + 2, 4) & 0xffffff);
+}
+
+CORE_ADDR
+w65_addr_bits_remove (addr)
+     CORE_ADDR addr;
+{
+  return ((addr) & 0xffffff);
+}
+
+read_memory_pointer (x)
+     CORE_ADDR x;
+{
+  return read_memory_integer (ADDR_BITS_REMOVE (x), 4);
+}
+
+init_frame_pc ()
+{
+  abort ();
+}
+
+void
+w65_push_dummy_frame ()
+{
+  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.
+
+   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);
+}
+
+int
+saved_pc_after_call ()
+{
+  int sp = read_register (SP_REGNUM);
+  int val = read_memory_integer (sp + 1, 4);
+  return ADDR_BITS_REMOVE (val);
+}
+
+
+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
+w65_pop_frame ()
+{
+}
+
+init_extra_frame_info ()
+{
+}
+
+pop_frame ()
+{
+}
+
+w65_frame_chain (thisframe)
+     struct frame_info *thisframe;
+{
+  return 0xffff & read_memory_integer ((thisframe)->frame, 2);
+}
+
+static int
+gb (x)
+{
+  return read_memory_integer (x, 1) & 0xff;
+}
+
+extern CORE_ADDR 
+w65_skip_prologue (pc)
+     CORE_ADDR pc;
+{
+  CORE_ADDR too_far = pc + 20;
+
+  /* looking for bits of the prologue, we can expect to
+     see this in a frameful function:
+
+     stack adjust:
+
+     3B                 tsc
+     1A                 inc a
+     18                 clc
+     69E2FF             adc     #0xffe2
+     3A                 dec a
+     1B                 tcs
+     1A                 inc a
+
+     link:
+
+     A500               lda     <r15
+     48                 pha
+     3B                 tsc
+     1a                 inc     a
+     8500               sta     <r15
+
+   */
+
+#define TSC  0x3b
+#define TCS  0x1b
+#define INCA 0x1a
+#define PHA  0x48
+#define LDADIR 0xa5
+#define STADIR 0x85
+
+  /* Skip a stack adjust - any area between a tsc and tcs */
+  if (gb (pc) == TSC)
+    {
+      while (pc < too_far && gb (pc) != TCS)
+	{
+	  pc++;
+	}
+      pc++;
+      /* Skip a stupid inc a */
+      if (gb (pc) == INCA)
+	pc++;
+
+    }
+  /* Stack adjust can also be done with n pha's */
+  while (gb (pc) == PHA)
+    pc++;
+
+  /* Skip a link - that's a ld/ph/tsc/inc/sta */
+
+  if (gb (pc) == LDADIR
+      && gb (pc + 5) == STADIR
+      && gb (pc + 1) == gb (pc + 6)
+      && gb (pc + 2) == PHA
+      && gb (pc + 3) == TSC
+      && gb (pc + 4) == INCA)
+    {
+      pc += 7;
+    }
+
+  return pc;
+}
+
+
+register_raw_size (n)
+{
+  return sim_reg_size (n);
+}
+
+
+void
+print_register_hook (regno)
+{
+  if (regno == P_REGNUM)
+    {
+      /* CCR register */
+
+      int C, Z, N, V, I, D, X, M;
+      unsigned char b[1];
+      unsigned char l;
+
+      read_relative_register_raw_bytes (regno, b);
+      l = b[0];
+      printf_unfiltered ("\t");
+      C = (l & 0x1) != 0;
+      Z = (l & 0x2) != 0;
+      I = (l & 0x4) != 0;
+      D = (l & 0x8) != 0;
+      X = (l & 0x10) != 0;
+      M = (l & 0x20) != 0;
+      V = (l & 0x40) != 0;
+      N = (l & 0x80) != 0;
+
+      printf_unfiltered ("N-%d ", N);
+      printf_unfiltered ("V-%d ", V);
+      printf_unfiltered ("M-%d ", M);
+      printf_unfiltered ("X-%d ", X);
+      printf_unfiltered ("D-%d ", D);
+      printf_unfiltered ("I-%d ", I);
+      printf_unfiltered ("Z-%d ", Z);
+      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 ("<= ");
+    }
+}
+
+void
+_initialize_w65_tdep ()
+{
+  tm_print_insn = print_insn_w65;
+}