Wed Jan 22 01:31:16 1997 Geoffrey Noer <noer@cygnus.com>

        Start mn10200 gdb port by adding copies of mn10300
        target-specific files with all instances of mn10300 changed
        to mn10200 to start with.
        * mn10200-tdep.c: new
        * config/mn10200/tm-mn10200.h: new, REGISTER_SIZE is 24 bits not 32,
        SP_REGNUM and FP_REGNUM are different, also no lar or lir.
        * config/mn10200/mn10200.mt: new

1 files changed, 378 insertions, 0 deletions

diff --git a/gdb/mn10200-tdep.c b/gdb/mn10200-tdep.c
new file mode 100644
index 0000000..03f3cd2
--- /dev/null
+++ b/gdb/mn10200-tdep.c
@@ -0,0 +1,378 @@
+/* Target-dependent code for the Matsushita MN10200 for GDB, the GNU debugger.
+   Copyright 1997 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.  */
+
+#include "defs.h"
+#include "frame.h"
+#include "inferior.h"
+#include "obstack.h"
+#include "target.h"
+#include "value.h"
+#include "bfd.h"
+#include "gdb_string.h"
+#include "gdbcore.h"
+#include "symfile.h"
+
+/* Info gleaned from scanning a function's prologue.  */
+
+struct pifsr			/* Info about one saved reg */
+{
+  int framereg;			/* Frame reg (SP or FP) */
+  int offset;			/* Offset from framereg */
+  int reg;			/* Saved register number */
+};
+
+struct prologue_info
+{
+  int framereg;
+  int frameoffset;
+  int start_function;
+  struct pifsr *pifsrs;
+};
+
+/* Function: frame_chain
+   Figure out and return the caller's frame pointer given current
+   frame_info struct.
+
+   We start out knowing the current pc, current sp, current fp.
+   We want to determine the caller's fp and caller's pc.  To do this
+   correctly, we have to be able to handle the case where we are in the
+   middle of the prologue which involves scanning the prologue.
+
+   We don't handle dummy frames yet but we would probably just return the
+   stack pointer that was in use at the time the function call was made?
+*/
+
+CORE_ADDR
+mn10200_frame_chain (fi)
+     struct frame_info *fi;
+{
+  struct prologue_info pi;
+  CORE_ADDR callers_pc, callers_fp, curr_sp;
+  CORE_ADDR past_prologue_addr;
+  int past_prologue = 1; /* default to being past prologue */
+  int n_movm_args = 4;
+
+  struct pifsr *pifsr, *pifsr_tmp;
+
+  /* current pc is fi->pc */
+  /* current fp is fi->frame */  
+
+  /* current sp is: */
+  curr_sp = read_register (SP_REGNUM);
+
+/*
+  printf("curr pc = 0x%x ; curr fp = 0x%x ; curr sp = 0x%x\n",
+	 fi->pc, fi->frame, curr_sp);
+*/
+
+  /* first inst after prologue is: */
+  past_prologue_addr = mn10200_skip_prologue (fi->pc);
+
+  /* Are we in the prologue? */
+  /* Yes if mn10200_skip_prologue returns an address after the
+     current pc in which case we have to scan prologue */
+  if (fi->pc < mn10200_skip_prologue (fi->pc))
+      past_prologue = 0;
+
+  /* scan prologue if we're not past it */
+  if (!past_prologue)
+    {
+	/* printf("scanning prologue\n"); */
+	/* FIXME -- fill out this case later */
+        return 0x666; /* bogus value */
+    }
+
+  if (past_prologue) /* if we don't need to scan the prologue */
+    {
+/*    printf("we're past the prologue\n"); */
+      callers_pc = fi->frame - REGISTER_SIZE;
+      callers_fp = fi->frame - ((n_movm_args + 1) * REGISTER_SIZE);
+/*
+      printf("callers_pc = 0x%x ; callers_fp = 0x%x\n",
+	     callers_pc, callers_fp);
+
+      printf("*callers_pc = 0x%x ; *callers_fp = 0x%x\n",
+	     read_memory_integer(callers_pc, REGISTER_SIZE),
+	     read_memory_integer(callers_fp, REGISTER_SIZE));
+*/
+      return read_memory_integer(callers_fp, REGISTER_SIZE);
+    }
+
+  /* we don't get here */
+}
+
+/* Function: find_callers_reg
+   Find REGNUM on the stack.  Otherwise, it's in an active register.
+   One thing we might want to do here is to check REGNUM against the
+   clobber mask, and somehow flag it as invalid if it isn't saved on
+   the stack somewhere.  This would provide a graceful failure mode
+   when trying to get the value of caller-saves registers for an inner
+   frame.  */
+
+CORE_ADDR
+mn10200_find_callers_reg (fi, regnum)
+     struct frame_info *fi;
+     int regnum;
+{
+/*  printf("mn10200_find_callers_reg\n"); */
+
+  for (; fi; fi = fi->next)
+    if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
+      return generic_read_register_dummy (fi->pc, fi->frame, regnum);
+    else if (fi->fsr.regs[regnum] != 0)
+      return read_memory_unsigned_integer (fi->fsr.regs[regnum], 
+					   REGISTER_RAW_SIZE(regnum));
+
+  return read_register (regnum);
+}
+
+/* Function: skip_prologue
+   Return the address of the first inst past the prologue of the function.
+*/
+
+CORE_ADDR
+mn10200_skip_prologue (pc)
+     CORE_ADDR pc;
+{
+  CORE_ADDR func_addr, func_end;
+
+/*  printf("mn10200_skip_prologue\n"); */
+
+  /* See what the symbol table says */
+
+  if (find_pc_partial_function (pc, NULL, &func_addr, &func_end))
+    {
+      struct symtab_and_line sal;
+
+      sal = find_pc_line (func_addr, 0);
+
+      if (sal.line != 0 && sal.end < func_end)
+	return sal.end;
+      else
+	/* Either there's no line info, or the line after the prologue is after
+	   the end of the function.  In this case, there probably isn't a
+	   prologue.  */
+	return pc;
+    }
+
+/* We can't find the start of this function, so there's nothing we can do. */
+  return pc;
+}
+
+/* Function: pop_frame
+   This routine gets called when either the user uses the `return'
+   command, or the call dummy breakpoint gets hit.  */
+
+void
+mn10200_pop_frame (frame)
+     struct frame_info *frame;
+{
+  int regnum;
+
+/*  printf("mn10200_pop_frame start\n"); */
+
+  if (PC_IN_CALL_DUMMY(frame->pc, frame->frame, frame->frame))
+    generic_pop_dummy_frame ();
+  else
+    {
+      write_register (PC_REGNUM, FRAME_SAVED_PC (frame));
+
+      for (regnum = 0; regnum < NUM_REGS; regnum++)
+	if (frame->fsr.regs[regnum] != 0)
+	  write_register (regnum,
+			  read_memory_unsigned_integer (frame->fsr.regs[regnum],
+							REGISTER_RAW_SIZE(regnum)));
+
+      write_register (SP_REGNUM, FRAME_FP (frame));
+    }
+
+  flush_cached_frames ();
+
+/*  printf("mn10200_pop_frame end\n"); */
+}
+
+/* Function: push_arguments
+   Setup arguments for a call to the target.  Arguments go in
+   order on the stack.
+*/
+
+CORE_ADDR
+mn10200_push_arguments (nargs, args, sp, struct_return, struct_addr)
+     int nargs;
+     value_ptr *args;
+     CORE_ADDR sp;
+     unsigned char struct_return;
+     CORE_ADDR struct_addr;
+{
+  int argnum = 0;
+  int len = 0;
+  int stack_offset = 0;  /* copy args to this offset onto stack */
+
+/*  printf("mn10200_push_arguments start\n"); */
+
+  /* First, just for safety, make sure stack is aligned */
+  sp &= ~3;
+
+  /* Now make space on the stack for the args. */
+  for (argnum = 0; argnum < nargs; argnum++)
+    len += ((TYPE_LENGTH(VALUE_TYPE(args[argnum])) + 3) & ~3);
+
+  sp -= len;
+
+  /* Push all arguments onto the stack. */
+  for (argnum = 0; argnum < nargs; argnum++)
+    {
+      int len;
+      char *val;
+
+      if (TYPE_CODE (VALUE_TYPE (*args)) == TYPE_CODE_STRUCT
+	  && TYPE_LENGTH (VALUE_TYPE (*args)) > 8)
+	{
+	  /* for now, pretend structs aren't special */
+          len = TYPE_LENGTH (VALUE_TYPE (*args));
+          val = (char *)VALUE_CONTENTS (*args);
+	}
+      else
+	{
+	  len = TYPE_LENGTH (VALUE_TYPE (*args));
+	  val = (char *)VALUE_CONTENTS (*args);
+	}
+
+      while (len > 0)
+	{
+	  write_memory (sp + stack_offset, val, 4);
+
+	  len -= 4;
+	  val += 4;
+	  stack_offset += 4;
+	}
+      args++;
+    }
+
+/*  printf"mn10200_push_arguments end\n"); */
+
+  return sp;
+}
+
+/* Function: push_return_address (pc)
+   Set up the return address for the inferior function call.
+   Needed for targets where we don't actually execute a JSR/BSR instruction */
+ 
+CORE_ADDR
+mn10200_push_return_address (pc, sp)
+     CORE_ADDR pc;
+     CORE_ADDR sp;
+{
+/*  printf("mn10200_push_return_address\n"); */
+
+  /* write_register (RP_REGNUM, CALL_DUMMY_ADDRESS ()); */
+  return sp;
+}
+ 
+/* Function: frame_saved_pc 
+   Find the caller of this frame.  We do this by seeing if RP_REGNUM
+   is saved in the stack anywhere, otherwise we get it from the
+   registers.  If the inner frame is a dummy frame, return its PC
+   instead of RP, because that's where "caller" of the dummy-frame
+   will be found.  */
+
+CORE_ADDR
+mn10200_frame_saved_pc (fi)
+     struct frame_info *fi;
+{
+/*  printf("mn10200_frame_saved_pc\n"); */
+
+  return (read_memory_integer(fi->frame - REGISTER_SIZE, REGISTER_SIZE));
+}
+
+void
+get_saved_register (raw_buffer, optimized, addrp, frame, regnum, lval)
+     char *raw_buffer;
+     int *optimized;
+     CORE_ADDR *addrp;
+     struct frame_info *frame;
+     int regnum;
+     enum lval_type *lval;
+{
+/*  printf("get_saved_register\n"); */
+
+  generic_get_saved_register (raw_buffer, optimized, addrp, 
+			      frame, regnum, lval);
+}
+
+/* Function: init_extra_frame_info
+   Setup the frame's frame pointer, pc, and frame addresses for saved
+   registers.  Most of the work is done in frame_chain().
+
+   Note that when we are called for the last frame (currently active frame),
+   that fi->pc and fi->frame will already be setup.  However, fi->frame will
+   be valid only if this routine uses FP.  For previous frames, fi-frame will
+   always be correct (since that is derived from v850_frame_chain ()).
+
+   We can be called with the PC in the call dummy under two circumstances.
+   First, during normal backtracing, second, while figuring out the frame
+   pointer just prior to calling the target function (see run_stack_dummy).
+*/
+
+void
+mn10200_init_extra_frame_info (fi)
+     struct frame_info *fi;
+{
+  struct prologue_info pi;
+  struct pifsr pifsrs[NUM_REGS + 1], *pifsr;
+  int reg;
+
+  if (fi->next)
+    fi->pc = FRAME_SAVED_PC (fi->next);
+
+  memset (fi->fsr.regs, '\000', sizeof fi->fsr.regs);
+
+  /* The call dummy doesn't save any registers on the stack, so we can return
+     now.  */
+/*
+  if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
+      return;
+
+  pi.pifsrs = pifsrs;
+*/
+
+  /* v850_scan_prologue (fi->pc, &pi); */
+/*
+  if (!fi->next && pi.framereg == SP_REGNUM)
+    fi->frame = read_register (pi.framereg) - pi.frameoffset;
+
+  for (pifsr = pifsrs; pifsr->framereg; pifsr++)
+    {
+      fi->fsr.regs[pifsr->reg] = pifsr->offset + fi->frame;
+
+      if (pifsr->framereg == SP_REGNUM)
+	fi->fsr.regs[pifsr->reg] += pi.frameoffset;
+    }
+*/
+/*   printf("init_extra_frame_info\n"); */
+}
+
+void
+_initialize_mn10200_tdep ()
+{
+/*  printf("_initialize_mn10200_tdep\n"); */
+
+  tm_print_insn = print_insn_mn10200;
+}
+