Initial creation of sourceware repository

1 files changed, 0 insertions, 499 deletions

diff --git a/gdb/tic80-tdep.c b/gdb/tic80-tdep.c
deleted file mode 100644
index 4a9883b..0000000
--- a/gdb/tic80-tdep.c
+++ /dev/null
@@ -1,499 +0,0 @@
-/* Target-dependent code for the TI TMS320C80 (MVP) for GDB, the GNU debugger.
-   Copyright 1996, 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 "value.h"
-#include "frame.h"
-#include "inferior.h"
-#include "obstack.h"
-#include "target.h"
-#include "bfd.h"
-#include "gdb_string.h"
-#include "gdbcore.h"
-#include "symfile.h"
-
-/* Function: frame_find_saved_regs
-   Return the frame_saved_regs structure for the frame.
-   Doesn't really work for dummy frames, but it does pass back
-   an empty frame_saved_regs, so I guess that's better than total failure */
-
-void 
-tic80_frame_find_saved_regs (fi, regaddr)
-     struct frame_info *fi;
-     struct frame_saved_regs *regaddr;
-{
-  memcpy (regaddr, &fi->fsr, sizeof (struct frame_saved_regs));
-}
-
-/* Function: skip_prologue
-   Find end of function prologue.  */
-
-CORE_ADDR
-tic80_skip_prologue (pc)
-     CORE_ADDR pc;
-{
-  CORE_ADDR func_addr, func_end;
-  struct symtab_and_line sal;
-
-  /* See what the symbol table says */
-
-  if (find_pc_partial_function (pc, NULL, &func_addr, &func_end))
-    {
-      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: tic80_scan_prologue
-   This function decodes the target function prologue to determine:
-     1) the size of the stack frame
-     2) which registers are saved on it
-     3) the offsets of saved regs
-     4) the frame size
-   This information is stored in the "extra" fields of the frame_info.  */
-
-static void
-tic80_scan_prologue (fi)
-     struct frame_info *fi;
-{
-  struct symtab_and_line sal;
-  CORE_ADDR prologue_start, prologue_end, current_pc;
-
-  /* Assume there is no frame until proven otherwise.  */
-  fi->framereg = SP_REGNUM;
-  fi->framesize = 0;
-  fi->frameoffset = 0;
-
-  /* this code essentially duplicates skip_prologue, 
-     but we need the start address below.  */
-
-  if (find_pc_partial_function (fi->pc, NULL, &prologue_start, &prologue_end))
-    {
-      sal = find_pc_line (prologue_start, 0);
-
-      if (sal.line == 0)		/* no line info, use current PC */
-	if (prologue_start != entry_point_address ())
-	  prologue_end = fi->pc;
-	else
-	  return;			/* _start has no frame or prologue */
-      else if (sal.end < prologue_end)	/* next line begins after fn end */
-	prologue_end = sal.end;		/* (probably means no prologue)  */
-    }
-  else
-/* FIXME */
-    prologue_end = prologue_start + 40; /* We're in the boondocks: allow for */
-					/* 16 pushes, an add, and "mv fp,sp" */
-
-  prologue_end = min (prologue_end, fi->pc);
-
-  /* Now search the prologue looking for instructions that set up the
-     frame pointer, adjust the stack pointer, and save registers.  */
-
-  for (current_pc = prologue_start; current_pc < prologue_end; current_pc += 4)
-    {
-      unsigned int insn;
-      int regno;
-      int offset = 0;
-
-      insn = read_memory_unsigned_integer (current_pc, 4);
-
-      if ((insn & 0x301000) == 0x301000)	/* Long immediate? */
-/* FIXME - set offset for long immediate instructions */
-	current_pc += 4;
-      else
-	{
-	  offset = insn & 0x7fff;		/* extract 15-bit offset */
-	  if (offset & 0x4000)			/* if negative, sign-extend */
-	    offset = -(0x8000 - offset);
-	}
-
-      if ((insn & 0x7fd0000) == 0x590000)	/* st.{w,d} reg, xx(r1) */
-	{
-	  regno = ((insn >> 27) & 0x1f);
-	  fi->fsr.regs[regno] = offset;
-	  if (insn & 0x8000)			/* 64-bit store (st.d)? */
-	    fi->fsr.regs[regno+1] = offset+4;
-	}
-      else if ((insn & 0xffff8000) == 0x086c8000)   /* addu xx, r1, r1 */
-	fi->framesize = -offset;
-      else if ((insn & 0xffff8000) == 0xf06c8000)  /* addu xx, r1, r30 */
-	{
-	  fi->framereg = FP_REGNUM;		/* fp is now valid */
-	  fi->frameoffset = offset;
-	  break;				/* end of stack adjustments */
-	}
-      else if (insn == 0xf03b2001)		/* addu r1, r0, r30 */
-	{
-	  fi->framereg = FP_REGNUM;		/* fp is now valid */
-	  fi->frameoffset = 0;
-	  break;				/* end of stack adjustments */
-	}
-      else
-/* FIXME - handle long immediate instructions */
-	break;				/* anything else isn't prologue */
-    }
-}
-
-/* Function: init_extra_frame_info
-   This function actually figures out the frame address for a given pc and
-   sp.  This is tricky on the c80 because we sometimes don't use an explicit
-   frame pointer, and the previous stack pointer isn't necessarily recorded
-   on the stack.  The only reliable way to get this info is to
-   examine the prologue.  */
-
-void
-tic80_init_extra_frame_info (fi)
-     struct frame_info *fi;
-{
-  int reg;
-
-  if (fi->next)
-    fi->pc = FRAME_SAVED_PC (fi->next);
-
-  /* Because zero is a valid register offset relative to SP, we initialize
-     the offsets to -1 to indicate unused entries.  */
-  for (reg = 0; reg < NUM_REGS; reg++)
-    fi->fsr.regs[reg] = -1;
-
-  if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
-    {
-      /* We need to setup fi->frame here because run_stack_dummy gets it wrong
-	 by assuming it's always FP.  */
-      fi->frame = generic_read_register_dummy (fi->pc, fi->frame, SP_REGNUM);
-      fi->framesize = 0;
-      fi->frameoffset = 0;
-      return;
-    }
-  else 
-    {
-      tic80_scan_prologue (fi);
-
-      if (!fi->next)			/* this is the innermost frame? */
-	fi->frame = read_register (fi->framereg);
-      else			 	/* not the innermost frame */
-	/* If this function uses FP as the frame register, and the function
-	   it called saved the FP, get the saved FP.  */
-	if (fi->framereg == FP_REGNUM &&
-	    fi->next->fsr.regs[FP_REGNUM] != (unsigned) -1)
-	  fi->frame = read_memory_integer (fi->next->fsr.regs[FP_REGNUM], 4);
-
-      /* Convert SP-relative offsets of saved registers to real addresses.  */
-      for (reg = 0; reg < NUM_REGS; reg++)
-	if (fi->fsr.regs[reg] == (unsigned) -1)
-	    fi->fsr.regs[reg] = 0;	/* unused entry */
-	  else
-	    fi->fsr.regs[reg] += fi->frame - fi->frameoffset;
-    }
-}
-
-/* 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
-tic80_find_callers_reg (fi, regnum)
-     struct frame_info *fi;
-     int regnum;
-{
-  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_integer (fi->fsr.regs[regnum], 
-				  REGISTER_RAW_SIZE(regnum));
-  return read_register (regnum);
-}
-
-/* Function: frame_chain
-   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 c80, we save the frame size when we initialize the frame_info.  */
-
-CORE_ADDR
-tic80_frame_chain (fi)
-     struct frame_info *fi;
-{
-  CORE_ADDR fn_start, callers_pc, fp;
-
-  /* is this a dummy frame? */
-  if (PC_IN_CALL_DUMMY(fi->pc, fi->frame, fi->frame))
-    return fi->frame;	/* dummy frame same as caller's frame */
-
-  /* is caller-of-this a dummy frame? */
-  callers_pc = FRAME_SAVED_PC(fi);  /* find out who called us: */
-  fp = tic80_find_callers_reg (fi, FP_REGNUM);
-  if (PC_IN_CALL_DUMMY(callers_pc, fp, fp))	
-    return fp;		/* dummy frame's frame may bear no relation to ours */
-
-  if (find_pc_partial_function (fi->pc, 0, &fn_start, 0))
-    if (fn_start == entry_point_address ())
-      return 0;		/* in _start fn, don't chain further */
-
-  if (fi->framereg == FP_REGNUM)
-    return tic80_find_callers_reg (fi, FP_REGNUM);
-  else
-    return fi->frame + fi->framesize;
-}
-
-/* Function: pop_frame
-   Discard from the stack the innermost frame,
-   restoring all saved registers.  */
-
-struct frame_info *
-tic80_pop_frame (frame)
-     struct frame_info *frame;
-{
-  int regnum;
-
-  if (PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame))
-    generic_pop_dummy_frame ();
-  else
-    {
-      for (regnum = 0; regnum < NUM_REGS; regnum++)
-	if (frame->fsr.regs[regnum] != 0)
-	  write_register (regnum, 
-			  read_memory_integer (frame->fsr.regs[regnum], 4));
-
-      write_register (PC_REGNUM, FRAME_SAVED_PC (frame));
-      write_register (SP_REGNUM, read_register (FP_REGNUM));
-#if 0
-      if (read_register (PSW_REGNUM) & 0x80)
-	write_register (SPU_REGNUM, read_register (SP_REGNUM));
-      else
-	write_register (SPI_REGNUM, read_register (SP_REGNUM));
-#endif
-    }
-  flush_cached_frames ();
-  return NULL;
-}
-
-/* Function: frame_saved_pc
-   Find the caller of this frame.  We do this by seeing if LR_REGNUM is saved
-   in the stack anywhere, otherwise we get it from the registers. */
-
-CORE_ADDR
-tic80_frame_saved_pc (fi)
-     struct frame_info *fi;
-{
-  if (PC_IN_CALL_DUMMY(fi->pc, fi->frame, fi->frame))
-    return generic_read_register_dummy (fi->pc, fi->frame, PC_REGNUM);
-  else
-    return tic80_find_callers_reg (fi, LR_REGNUM);
-}
-
-/* Function: tic80_push_return_address (pc, sp)
-   Set up the return address for the inferior function call.
-   Necessary for targets that don't actually execute a JSR/BSR instruction 
-   (ie. when using an empty CALL_DUMMY) */
-
-CORE_ADDR
-tic80_push_return_address (pc, sp)
-     CORE_ADDR pc;
-     CORE_ADDR sp;
-{
-  write_register (LR_REGNUM, CALL_DUMMY_ADDRESS ());
-  return sp;
-}
-
-
-/* Function: push_arguments
-   Setup the function arguments for calling a function in the inferior.
-
-   On the TI C80 architecture, there are six register pairs (R2/R3 to R12/13)
-   which are dedicated for passing function arguments.  Up to the first six
-   arguments (depending on size) may go into these registers.
-   The rest go on the stack.
-
-   Arguments that are smaller than 4 bytes will still take up a whole
-   register or a whole 32-bit word on the stack, and will be
-   right-justified in the register or the stack word.  This includes
-   chars, shorts, and small aggregate types.
- 
-   Arguments that are four bytes or less in size are placed in the
-   even-numbered register of a register pair, and the odd-numbered
-   register is not used.
-
-   Arguments of 8 bytes size (such as floating point doubles) are placed
-   in a register pair.  The least significant 32-bit word is placed in
-   the even-numbered register, and the most significant word in the
-   odd-numbered register.
-
-   Aggregate types with sizes between 4 and 8 bytes are passed
-   entirely on the stack, and are left-justified within the
-   double-word (as opposed to aggregates smaller than 4 bytes
-   which are right-justified).
-
-   Aggregates of greater than 8 bytes are first copied onto the stack, 
-   and then a pointer to the copy is passed in the place of the normal
-   argument (either in a register if available, or on the stack).
-
-   Functions that must return an aggregate type can return it in the 
-   normal return value registers (R2 and R3) if its size is 8 bytes or
-   less.  For larger return values, the caller must allocate space for 
-   the callee to copy the return value to.  A pointer to this space is
-   passed as an implicit first argument, always in R0. */
-
-CORE_ADDR
-tic80_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 stack_offset, stack_alloc;
-  int argreg;
-  int argnum;
-  struct type *type;
-  CORE_ADDR regval;
-  char *val;
-  char valbuf[4];
-  int len;
-  int odd_sized_struct;
-  int is_struct;
-
-  /* first force sp to a 4-byte alignment */
-  sp = sp & ~3;
-
-  argreg = ARG0_REGNUM;  
-  /* The "struct return pointer" pseudo-argument goes in R0 */
-  if (struct_return)
-      write_register (argreg++, struct_addr);
- 
-  /* Now make sure there's space on the stack */
-  for (argnum = 0, stack_alloc = 0;
-       argnum < nargs; argnum++)
-    stack_alloc += ((TYPE_LENGTH(VALUE_TYPE(args[argnum])) + 3) & ~3);
-  sp -= stack_alloc;    /* make room on stack for args */
- 
- 
-  /* Now load as many as possible of the first arguments into
-     registers, and push the rest onto the stack.  There are 16 bytes
-     in four registers available.  Loop thru args from first to last.  */
- 
-  argreg = ARG0_REGNUM;
-  for (argnum = 0, stack_offset = 0; argnum < nargs; argnum++)
-    {
-      type = VALUE_TYPE (args[argnum]);
-      len  = TYPE_LENGTH (type);
-      memset (valbuf, 0, sizeof (valbuf));
-      val = (char *) VALUE_CONTENTS (args[argnum]);
- 
-/* FIXME -- tic80 can take doubleword arguments in register pairs */
-      is_struct = (type->code == TYPE_CODE_STRUCT);
-      odd_sized_struct = 0;
-
-      if (! is_struct)
-	{
-	  if (len < 4)
-	    { /* value gets right-justified in the register or stack word */
-	      memcpy (valbuf + (4 - len), val, len);
-	      val = valbuf;
-	    }
-	  if (len > 4 && (len & 3) != 0)
-	    odd_sized_struct = 1;     /* such structs go entirely on stack */
-	}
-      else
-	{
-	  /* Structs are always passed by reference. */
-	  write_register (argreg, sp + stack_offset);
-	  argreg ++;
-	}
-
-      while (len > 0)
-        {
-          if (is_struct || argreg > ARGLAST_REGNUM || odd_sized_struct)
-            {				/* must go on the stack */
-              write_memory (sp + stack_offset, val, 4);
-              stack_offset += 4;
-            }
-          /* NOTE WELL!!!!!  This is not an "else if" clause!!!
-             That's because some things get passed on the stack
-             AND in the registers!   */
-          if (!is_struct && argreg <= ARGLAST_REGNUM)
-            {				/* there's room in a register */
-              regval = extract_address (val, REGISTER_RAW_SIZE(argreg));
-              write_register (argreg, regval);
-	      argreg += 2;	/* FIXME -- what about doubleword args? */
-            }
-          /* Store the value 4 bytes at a time.  This means that things
-             larger than 4 bytes may go partly in registers and partly
-             on the stack.  */
-          len -= REGISTER_RAW_SIZE(argreg);
-          val += REGISTER_RAW_SIZE(argreg);
-        }
-    }
-  return sp;
-}
-
-/* Function: get_saved_register
-   Just call the generic_get_saved_register function.  */
-
-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;
-{
-  generic_get_saved_register (raw_buffer, optimized, addrp, 
-			      frame, regnum, lval);
-}
-
-/* Function: tic80_write_sp
-   Because SP is really a read-only register that mirrors either SPU or SPI,
-   we must actually write one of those two as well, depending on PSW. */
-
-void
-tic80_write_sp (val)
-     CORE_ADDR val;
-{
-#if 0
-  unsigned long psw = read_register (PSW_REGNUM);
-
-  if (psw & 0x80)	/* stack mode: user or interrupt */
-    write_register (SPU_REGNUM, val);
-  else
-    write_register (SPI_REGNUM, val);
-#endif
-  write_register (SP_REGNUM, val);
-}
-
-void
-_initialize_tic80_tdep ()
-{
-  tm_print_insn = print_insn_tic80;
-}
-