Initial creation of sourceware repository

1 files changed, 0 insertions, 629 deletions

diff --git a/gdb/m88k-tdep.c b/gdb/m88k-tdep.c
deleted file mode 100644
index f82cb76..0000000
--- a/gdb/m88k-tdep.c
+++ /dev/null
@@ -1,629 +0,0 @@
-/* Target-machine dependent code for Motorola 88000 series, for GDB.
-   Copyright 1988, 1990, 1991, 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.  */
-
-#include "defs.h"
-#include "frame.h"
-#include "inferior.h"
-#include "value.h"
-#include "gdbcore.h"
-#include "symtab.h"
-#include "setjmp.h"
-#include "value.h"
-
-/* Size of an instruction */
-#define	BYTES_PER_88K_INSN	4
-
-void frame_find_saved_regs ();
-
-/* Is this target an m88110?  Otherwise assume m88100.  This has
-   relevance for the ways in which we screw with instruction pointers.  */
-
-int target_is_m88110 = 0;
-
-/* The m88k kernel aligns all instructions on 4-byte boundaries.  The
-   kernel also uses the least significant two bits for its own hocus
-   pocus.  When gdb receives an address from the kernel, it needs to
-   preserve those right-most two bits, but gdb also needs to be careful
-   to realize that those two bits are not really a part of the address
-   of an instruction.  Shrug.  */
-
-CORE_ADDR
-m88k_addr_bits_remove (addr)
-     CORE_ADDR addr;
-{
-  return ((addr) & ~3);
-}
-
-
-/* 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
-frame_chain (thisframe)
-     struct frame_info *thisframe;
-{
-
-  frame_find_saved_regs (thisframe, (struct frame_saved_regs *) 0);
-  /* NOTE:  this depends on frame_find_saved_regs returning the VALUE, not
- 	    the ADDRESS, of SP_REGNUM.  It also depends on the cache of
-	    frame_find_saved_regs results.  */
-  if (thisframe->fsr->regs[SP_REGNUM])
-    return thisframe->fsr->regs[SP_REGNUM];
-  else
-    return thisframe->frame;	/* Leaf fn -- next frame up has same SP. */
-}
-
-int
-frameless_function_invocation (frame)
-     struct frame_info *frame;
-{
-
-  frame_find_saved_regs (frame, (struct frame_saved_regs *) 0);
-  /* NOTE:  this depends on frame_find_saved_regs returning the VALUE, not
- 	    the ADDRESS, of SP_REGNUM.  It also depends on the cache of
-	    frame_find_saved_regs results.  */
-  if (frame->fsr->regs[SP_REGNUM])
-    return 0;			/* Frameful -- return addr saved somewhere */
-  else
-    return 1;			/* Frameless -- no saved return address */
-}
-
-void
-init_extra_frame_info (fromleaf, frame)
-     int fromleaf;
-     struct frame_info *frame;
-{
-  frame->fsr = 0;			/* Not yet allocated */
-  frame->args_pointer = 0;		/* Unknown */
-  frame->locals_pointer = 0;	/* Unknown */
-}
-
-/* Examine an m88k function prologue, recording the addresses at which
-   registers are saved explicitly by the prologue code, and returning
-   the address of the first instruction after the prologue (but not
-   after the instruction at address LIMIT, as explained below).
-
-   LIMIT places an upper bound on addresses of the instructions to be
-   examined.  If the prologue code scan reaches LIMIT, the scan is
-   aborted and LIMIT is returned.  This is used, when examining the
-   prologue for the current frame, to keep examine_prologue () from
-   claiming that a given register has been saved when in fact the
-   instruction that saves it has not yet been executed.  LIMIT is used
-   at other times to stop the scan when we hit code after the true
-   function prologue (e.g. for the first source line) which might
-   otherwise be mistaken for function prologue.
-
-   The format of the function prologue matched by this routine is
-   derived from examination of the source to gcc 1.95, particularly
-   the routine output_prologue () in config/out-m88k.c.
-
-   subu r31,r31,n			# stack pointer update
-
-   (st rn,r31,offset)?			# save incoming regs
-   (st.d rn,r31,offset)?
-
-   (addu r30,r31,n)?			# frame pointer update
-
-   (pic sequence)?			# PIC code prologue
-
-   (or   rn,rm,0)?			# Move parameters to other regs
-*/
-
-/* Macros for extracting fields from instructions.  */
-
-#define BITMASK(pos, width) (((0x1 << (width)) - 1) << (pos))
-#define EXTRACT_FIELD(val, pos, width) ((val) >> (pos) & BITMASK (0, width))
-#define	SUBU_OFFSET(x)	((unsigned)(x & 0xFFFF))
-#define	ST_OFFSET(x)	((unsigned)((x) & 0xFFFF))
-#define	ST_SRC(x)	EXTRACT_FIELD ((x), 21, 5)
-#define	ADDU_OFFSET(x)	((unsigned)(x & 0xFFFF))
-
-/*
- * prologue_insn_tbl is a table of instructions which may comprise a
- * function prologue.  Associated with each table entry (corresponding
- * to a single instruction or group of instructions), is an action.
- * This action is used by examine_prologue (below) to determine
- * the state of certain machine registers and where the stack frame lives.
- */
-
-enum prologue_insn_action {
-  PIA_SKIP,			/* don't care what the instruction does */
-  PIA_NOTE_ST,			/* note register stored and where */
-  PIA_NOTE_STD,			/* note pair of registers stored and where */
-  PIA_NOTE_SP_ADJUSTMENT,	/* note stack pointer adjustment */
-  PIA_NOTE_FP_ASSIGNMENT,	/* note frame pointer assignment */
-  PIA_NOTE_PROLOGUE_END,	/* no more prologue */
-};
-
-struct prologue_insns {
-    unsigned long insn;
-    unsigned long mask;
-    enum prologue_insn_action action;
-};
-
-struct prologue_insns prologue_insn_tbl[] = {
-  /* Various register move instructions */
-  { 0x58000000, 0xf800ffff, PIA_SKIP },		/* or/or.u with immed of 0 */
-  { 0xf4005800, 0xfc1fffe0, PIA_SKIP },		/* or rd, r0, rs */
-  { 0xf4005800, 0xfc00ffff, PIA_SKIP },		/* or rd, rs, r0 */
-
-  /* Stack pointer setup: "subu sp, sp, n" where n is a multiple of 8 */
-  { 0x67ff0000, 0xffff0007, PIA_NOTE_SP_ADJUSTMENT },
-
-  /* Frame pointer assignment: "addu r30, r31, n" */
-  { 0x63df0000, 0xffff0000, PIA_NOTE_FP_ASSIGNMENT },
-
-  /* Store to stack instructions; either "st rx, sp, n" or "st.d rx, sp, n" */
-  { 0x241f0000, 0xfc1f0000, PIA_NOTE_ST },	/* st rx, sp, n */
-  { 0x201f0000, 0xfc1f0000, PIA_NOTE_STD },	/* st.d rs, sp, n */
-
-  /* Instructions needed for setting up r25 for pic code. */
-  { 0x5f200000, 0xffff0000, PIA_SKIP },		/* or.u r25, r0, offset_high */
-  { 0xcc000002, 0xffffffff, PIA_SKIP },		/* bsr.n Lab */
-  { 0x5b390000, 0xffff0000, PIA_SKIP },		/* or r25, r25, offset_low */
-  { 0xf7396001, 0xffffffff, PIA_SKIP },		/* Lab: addu r25, r25, r1 */
-
-  /* Various branch or jump instructions which have a delay slot -- these
-     do not form part of the prologue, but the instruction in the delay
-     slot might be a store instruction which should be noted. */
-  { 0xc4000000, 0xe4000000, PIA_NOTE_PROLOGUE_END }, 
-  					/* br.n, bsr.n, bb0.n, or bb1.n */
-  { 0xec000000, 0xfc000000, PIA_NOTE_PROLOGUE_END }, /* bcnd.n */
-  { 0xf400c400, 0xfffff7e0, PIA_NOTE_PROLOGUE_END } /* jmp.n or jsr.n */
-
-};
-
-
-/* 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. */
-
-#define NEXT_PROLOGUE_INSN(addr, lim, pword1) \
-  (((addr) < (lim)) ? next_insn (addr, pword1) : 0)
-
-/* Read the m88k instruction at 'memaddr' and return the address of 
-   the next instruction after that, or 0 if 'memaddr' is not the
-   address of a valid instruction.  The instruction
-   is stored at 'pword1'.  */
-
-CORE_ADDR
-next_insn (memaddr, pword1)
-     unsigned long *pword1;
-     CORE_ADDR memaddr;
-{
-  *pword1 = read_memory_integer (memaddr, BYTES_PER_88K_INSN);
-  return memaddr + BYTES_PER_88K_INSN;
-}
-
-/* Read a register from frames called by us (or from the hardware regs).  */
-
-static int
-read_next_frame_reg(frame, regno)
-     struct frame_info *frame;
-     int regno;
-{
-  for (; frame; frame = frame->next) {
-      if (regno == SP_REGNUM)
-	return FRAME_FP (frame);
-      else if (frame->fsr->regs[regno])
-	return read_memory_integer(frame->fsr->regs[regno], 4);
-  }
-  return read_register(regno);
-}
-
-/* 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.  */
-
-static CORE_ADDR
-examine_prologue (ip, limit, frame_sp, fsr, fi)
-     register CORE_ADDR ip;
-     register CORE_ADDR limit;
-     CORE_ADDR frame_sp;
-     struct frame_saved_regs *fsr;
-     struct frame_info *fi;
-{
-  register CORE_ADDR next_ip;
-  register int src;
-  unsigned int insn;
-  int size, offset;
-  char must_adjust[32];		/* If set, must adjust offsets in fsr */
-  int sp_offset = -1;		/* -1 means not set (valid must be mult of 8) */
-  int fp_offset = -1;		/* -1 means not set */
-  CORE_ADDR frame_fp;
-  CORE_ADDR prologue_end = 0;
-
-  memset (must_adjust, '\0', sizeof (must_adjust));
-  next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn);
-
-  while (next_ip)
-    {
-      struct prologue_insns *pip; 
-
-      for (pip=prologue_insn_tbl; (insn & pip->mask) != pip->insn; )
-	  if (++pip >= prologue_insn_tbl + sizeof prologue_insn_tbl)
-	      goto end_of_prologue_found;	/* not a prologue insn */
-
-      switch (pip->action)
-	{
-	  case PIA_NOTE_ST:
-	  case PIA_NOTE_STD:
-	    if (sp_offset != -1) {
-		src = ST_SRC (insn);
-		offset = ST_OFFSET (insn);
-		must_adjust[src] = 1;
-		fsr->regs[src++] = offset;	/* Will be adjusted later */
-		if (pip->action == PIA_NOTE_STD && src < 32)
-		  {
-		    offset += 4;
-		    must_adjust[src] = 1;
-		    fsr->regs[src++] = offset;
-		  }
-	    }
-	    else
-		goto end_of_prologue_found;
-	    break;
-	  case PIA_NOTE_SP_ADJUSTMENT:
-	    if (sp_offset == -1)
-		sp_offset = -SUBU_OFFSET (insn);
-	    else
-		goto end_of_prologue_found;
-	    break;
-	  case PIA_NOTE_FP_ASSIGNMENT:
-	    if (fp_offset == -1)
-		fp_offset = ADDU_OFFSET (insn);
-	    else
-		goto end_of_prologue_found;
-	    break;
-	  case PIA_NOTE_PROLOGUE_END:
-	    if (!prologue_end)
-		prologue_end = ip;
-	    break;
-	  case PIA_SKIP:
-	  default :
-	    /* Do nothing */
-	    break;
-	}
-
-      ip = next_ip;
-      next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn);
-    }
-
-end_of_prologue_found:
-
-    if (prologue_end)
-	ip = prologue_end;
-
-  /* We're done with the prologue.  If we don't care about the stack
-     frame itself, just return.  (Note that fsr->regs has been trashed,
-     but the one caller who calls with fi==0 passes a dummy there.)  */
-
-  if (fi == 0)
-    return ip;
-
-  /*
-     OK, now we have:
-
-     	sp_offset	original (before any alloca calls) displacement of SP
-			(will be negative).
-
-	fp_offset	displacement from original SP to the FP for this frame
-			or -1.
-
-	fsr->regs[0..31]	displacement from original SP to the stack
-				location where reg[0..31] is stored.
-
-	must_adjust[0..31]	set if corresponding offset was set.
-
-     If alloca has been called between the function prologue and the current
-     IP, then the current SP (frame_sp) will not be the original SP as set by
-     the function prologue.  If the current SP is not the original SP, then the
-     compiler will have allocated an FP for this frame, fp_offset will be set,
-     and we can use it to calculate the original SP.
-
-     Then, we figure out where the arguments and locals are, and relocate the
-     offsets in fsr->regs to absolute addresses.  */
-
-  if (fp_offset != -1) {
-    /* We have a frame pointer, so get it, and base our calc's on it.  */
-    frame_fp = (CORE_ADDR) read_next_frame_reg (fi->next, ACTUAL_FP_REGNUM);
-    frame_sp = frame_fp - fp_offset;
-  } else {
-    /* We have no frame pointer, therefore frame_sp is still the same value
-       as set by prologue.  But where is the frame itself?  */
-    if (must_adjust[SRP_REGNUM]) {
-      /* Function header saved SRP (r1), the return address.  Frame starts
-	 4 bytes down from where it was saved.  */
-      frame_fp = frame_sp + fsr->regs[SRP_REGNUM] - 4;
-      fi->locals_pointer = frame_fp;
-    } else {
-      /* Function header didn't save SRP (r1), so we are in a leaf fn or
-	 are otherwise confused.  */
-      frame_fp = -1;
-    }
-  }
-
-  /* The locals are relative to the FP (whether it exists as an allocated
-     register, or just as an assumed offset from the SP) */
-  fi->locals_pointer = frame_fp;
-
-  /* The arguments are just above the SP as it was before we adjusted it
-     on entry.  */
-  fi->args_pointer = frame_sp - sp_offset;
-
-  /* Now that we know the SP value used by the prologue, we know where
-     it saved all the registers.  */
-  for (src = 0; src < 32; src++)
-    if (must_adjust[src])
-      fsr->regs[src] += frame_sp;
- 
-  /* The saved value of the SP is always known.  */
-  /* (we hope...) */
-  if (fsr->regs[SP_REGNUM] != 0 
-   && fsr->regs[SP_REGNUM] != frame_sp - sp_offset)
-    fprintf_unfiltered(gdb_stderr, "Bad saved SP value %x != %x, offset %x!\n",
-        fsr->regs[SP_REGNUM],
-	frame_sp - sp_offset, sp_offset);
-
-  fsr->regs[SP_REGNUM] = frame_sp - sp_offset;
-
-  return (ip);
-}
-
-/* Given an ip value corresponding to the start of a function,
-   return the ip of the first instruction after the function 
-   prologue.  */
-
-CORE_ADDR
-skip_prologue (ip)
-     CORE_ADDR (ip);
-{
-  struct frame_saved_regs saved_regs_dummy;
-  struct symtab_and_line sal;
-  CORE_ADDR limit;
-
-  sal = find_pc_line (ip, 0);
-  limit = (sal.end) ? sal.end : 0xffffffff;
-
-  return (examine_prologue (ip, limit, (CORE_ADDR) 0, &saved_regs_dummy,
-			    (struct frame_info *)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_obstack, since it is
-   fairly expensive.  */
-
-void
-frame_find_saved_regs (fi, fsr)
-     struct frame_info *fi;
-     struct frame_saved_regs *fsr;
-{
-  register struct frame_saved_regs *cache_fsr;
-  CORE_ADDR ip;
-  struct symtab_and_line sal;
-  CORE_ADDR limit;
-
-  if (!fi->fsr)
-    {
-      cache_fsr = (struct frame_saved_regs *)
-	frame_obstack_alloc (sizeof (struct frame_saved_regs));
-      memset (cache_fsr, '\0', sizeof (struct frame_saved_regs));
-      fi->fsr = cache_fsr;
-
-      /* Find the start and end of the function prologue.  If the PC
-	 is in the function prologue, we only consider the part that
-	 has executed already.  In the case where the PC is not in
-	 the function prologue, we set limit to two instructions beyond
-	 where the prologue ends in case if any of the prologue instructions
-	 were moved into a delay slot of a branch instruction. */
-         
-      ip = get_pc_function_start (fi->pc);
-      sal = find_pc_line (ip, 0);
-      limit = (sal.end && sal.end < fi->pc) ? sal.end + 2 * BYTES_PER_88K_INSN 
-					    : fi->pc;
-
-      /* This will fill in fields in *fi as well as in cache_fsr.  */
-#ifdef SIGTRAMP_FRAME_FIXUP
-      if (fi->signal_handler_caller)
-	SIGTRAMP_FRAME_FIXUP(fi->frame);
-#endif
-      examine_prologue (ip, limit, fi->frame, cache_fsr, fi);
-#ifdef SIGTRAMP_SP_FIXUP
-      if (fi->signal_handler_caller && fi->fsr->regs[SP_REGNUM])
-	SIGTRAMP_SP_FIXUP(fi->fsr->regs[SP_REGNUM]);
-#endif
-    }
-
-  if (fsr)
-    *fsr = *fi->fsr;
-}
-
-/* Return the address of the locals block for the frame
-   described by FI.  Returns 0 if the address is unknown.
-   NOTE!  Frame locals are referred to by negative offsets from the
-   argument pointer, so this is the same as frame_args_address().  */
-
-CORE_ADDR
-frame_locals_address (fi)
-     struct frame_info *fi;
-{
-  struct frame_saved_regs fsr;
-
-  if (fi->args_pointer)	/* Cached value is likely there.  */
-    return fi->args_pointer;
-
-  /* Nope, generate it.  */
-
-  get_frame_saved_regs (fi, &fsr);
-
-  return fi->args_pointer;
-}
-
-/* Return the address of the argument block for the frame
-   described by FI.  Returns 0 if the address is unknown.  */
-
-CORE_ADDR
-frame_args_address (fi)
-     struct frame_info *fi;
-{
-  struct frame_saved_regs fsr;
-
-  if (fi->args_pointer)		/* Cached value is likely there.  */
-    return fi->args_pointer;
-
-  /* Nope, generate it.  */
-
-  get_frame_saved_regs (fi, &fsr);
-
-  return fi->args_pointer;
-}
-
-/* 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_next_frame_reg(frame, SRP_REGNUM);
-}
-
-
-#define DUMMY_FRAME_SIZE 192
-
-static void
-write_word (sp, word)
-     CORE_ADDR sp;
-     ULONGEST word;
-{
-  register int len = REGISTER_SIZE;
-  char buffer[MAX_REGISTER_RAW_SIZE];
-
-  store_unsigned_integer (buffer, len, word);
-  write_memory (sp, buffer, len);
-}
-
-void
-m88k_push_dummy_frame()
-{
-  register CORE_ADDR sp = read_register (SP_REGNUM);
-  register int rn;
-  int offset;
-
-  sp -= DUMMY_FRAME_SIZE;	/* allocate a bunch of space */
-
-  for (rn = 0, offset = 0; rn <= SP_REGNUM; rn++, offset+=4)
-    write_word (sp+offset, read_register(rn));
-  
-  write_word (sp+offset, read_register (SXIP_REGNUM));
-  offset += 4;
-
-  write_word (sp+offset, read_register (SNIP_REGNUM));
-  offset += 4;
-
-  write_word (sp+offset, read_register (SFIP_REGNUM));
-  offset += 4;
-
-  write_word (sp+offset, read_register (PSR_REGNUM));
-  offset += 4;
-
-  write_word (sp+offset, read_register (FPSR_REGNUM));
-  offset += 4;
-
-  write_word (sp+offset, read_register (FPCR_REGNUM));
-  offset += 4;
-
-  write_register (SP_REGNUM, sp);
-  write_register (ACTUAL_FP_REGNUM, sp);
-}
-
-void
-pop_frame ()
-{
-  register struct frame_info *frame = get_current_frame ();
-  register CORE_ADDR fp;
-  register int regnum;
-  struct frame_saved_regs fsr;
-
-  fp = FRAME_FP (frame);
-  get_frame_saved_regs (frame, &fsr);
-
-  if (PC_IN_CALL_DUMMY (read_pc (), read_register (SP_REGNUM), FRAME_FP (fi)))
-    {
-      /* FIXME: I think get_frame_saved_regs should be handling this so
-	 that we can deal with the saved registers properly (e.g. frame
-	 1 is a call dummy, the user types "frame 2" and then "print $ps").  */
-      register CORE_ADDR sp = read_register (ACTUAL_FP_REGNUM);
-      int offset;
-
-      for (regnum = 0, offset = 0; regnum <= SP_REGNUM; regnum++, offset+=4)
-	(void) write_register (regnum, read_memory_integer (sp+offset, 4));
-  
-      write_register (SXIP_REGNUM, read_memory_integer (sp+offset, 4));
-      offset += 4;
-
-      write_register (SNIP_REGNUM, read_memory_integer (sp+offset, 4));
-      offset += 4;
-
-      write_register (SFIP_REGNUM, read_memory_integer (sp+offset, 4));
-      offset += 4;
-
-      write_register (PSR_REGNUM, read_memory_integer (sp+offset, 4));
-      offset += 4;
-
-      write_register (FPSR_REGNUM, read_memory_integer (sp+offset, 4));
-      offset += 4;
-
-      write_register (FPCR_REGNUM, read_memory_integer (sp+offset, 4));
-      offset += 4;
-
-    }
-  else 
-    {
-      for (regnum = FP_REGNUM ; regnum > 0 ; regnum--)
-	  if (fsr.regs[regnum])
-	      write_register (regnum,
-			      read_memory_integer (fsr.regs[regnum], 4));
-      write_pc (frame_saved_pc (frame));
-    }
-  reinit_frame_cache ();
-}
-
-void
-_initialize_m88k_tdep ()
-{
-  tm_print_insn = print_insn_m88k;
-}