296 lines
5.8 KiB
C
296 lines
5.8 KiB
C
/* Target-machine dependent code for WDC-65816, for GDB.
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Copyright (C) 1995 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/*
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Contributed by Steve Chamberlain
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sac@cygnus.com
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*/
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#include "defs.h"
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#include "frame.h"
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#include "obstack.h"
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#include "symtab.h"
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#include "gdbcmd.h"
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#include "gdbtypes.h"
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#include "dis-asm.h"
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/* Return the saved PC from this frame. */
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CORE_ADDR
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w65_frame_saved_pc (frame)
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struct frame_info *frame;
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{
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return (read_memory_integer (frame->frame + 2, 4) & 0xffffff);
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}
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CORE_ADDR
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addr_bits_remove (x)
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CORE_ADDR x;
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{
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return x;
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}
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read_memory_pointer (x)
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CORE_ADDR x;
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{
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return read_memory_integer (ADDR_BITS_REMOVE (x), 4);
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}
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init_frame_pc ()
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{
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abort ();
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}
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void
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w65_push_dummy_frame ()
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{
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abort ();
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}
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/* Put here the code to store, into a struct frame_saved_regs,
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the addresses of the saved registers of frame described by FRAME_INFO.
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This includes special registers such as pc and fp saved in special
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ways in the stack frame. sp is even more special:
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the address we return for it IS the sp for the next frame.
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We cache the result of doing this in the frame_cache_obstack, since
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it is fairly expensive. */
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void
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frame_find_saved_regs (fip, fsrp)
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struct frame_info *fip;
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struct frame_saved_regs *fsrp;
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{
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int locals;
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CORE_ADDR pc;
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CORE_ADDR adr;
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int i;
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memset (fsrp, 0, sizeof *fsrp);
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}
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int
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saved_pc_after_call ()
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{
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int sp = read_register (SP_REGNUM);
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int val = read_memory_integer (sp + 1, 4);
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return ADDR_BITS_REMOVE (val);
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}
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extract_return_value (type, regbuf, valbuf)
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struct type *type;
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char *regbuf;
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char *valbuf;
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{
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int b;
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int len = TYPE_LENGTH (type);
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for (b = 0; b < len; b += 2)
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{
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int todo = len - b;
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if (todo > 2)
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todo = 2;
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memcpy (valbuf + b, regbuf + b, todo);
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}
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}
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void
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write_return_value (type, valbuf)
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struct type *type;
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char *valbuf;
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{
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int reg;
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int len;
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for (len = 0; len < TYPE_LENGTH (type); len += 2)
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{
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write_register_bytes (REGISTER_BYTE (len / 2 + 2), valbuf + len, 2);
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}
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}
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void
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store_struct_return (addr, sp)
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CORE_ADDR addr;
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CORE_ADDR sp;
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{
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write_register (2, addr);
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}
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void
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w65_pop_frame ()
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{
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}
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init_extra_frame_info ()
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{
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}
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pop_frame ()
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{
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}
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w65_frame_chain (thisframe)
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struct frame_info *thisframe;
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{
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return 0xffff & read_memory_integer ((thisframe)->frame, 2);
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}
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static int
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gb (x)
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{
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return read_memory_integer (x, 1) & 0xff;
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}
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extern CORE_ADDR
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w65_skip_prologue (pc)
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CORE_ADDR pc;
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{
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CORE_ADDR too_far = pc + 20;
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/* looking for bits of the prologue, we can expect to
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see this in a frameful function:
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stack adjust:
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3B tsc
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1A inc a
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18 clc
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69E2FF adc #0xffe2
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3A dec a
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1B tcs
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1A inc a
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link:
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A500 lda <r15
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48 pha
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3B tsc
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1a inc a
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8500 sta <r15
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*/
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#define TSC 0x3b
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#define TCS 0x1b
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#define INCA 0x1a
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#define PHA 0x48
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#define LDADIR 0xa5
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#define STADIR 0x85
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/* Skip a stack adjust - any area between a tsc and tcs */
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if (gb (pc) == TSC)
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{
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while (pc < too_far && gb (pc) != TCS)
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{
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pc++;
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}
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pc++;
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/* Skip a stupid inc a */
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if (gb (pc) == INCA)
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pc++;
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}
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/* Stack adjust can also be done with n pha's */
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while (gb (pc) == PHA)
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pc++;
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/* Skip a link - that's a ld/ph/tsc/inc/sta */
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if (gb (pc) == LDADIR
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&& gb (pc + 5) == STADIR
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&& gb (pc + 1) == gb (pc + 6)
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&& gb (pc + 2) == PHA
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&& gb (pc + 3) == TSC
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&& gb (pc + 4) == INCA)
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{
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pc += 7;
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}
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return pc;
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}
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register_raw_size (n)
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{
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return sim_reg_size (n);
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}
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void
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print_register_hook (regno)
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{
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if (regno == P_REGNUM)
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{
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/* CCR register */
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int C, Z, N, V, I, D, X, M;
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unsigned char b[1];
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unsigned char l;
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read_relative_register_raw_bytes (regno, b);
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l = b[0];
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printf_unfiltered ("\t");
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C = (l & 0x1) != 0;
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Z = (l & 0x2) != 0;
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I = (l & 0x4) != 0;
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D = (l & 0x8) != 0;
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X = (l & 0x10) != 0;
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M = (l & 0x20) != 0;
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V = (l & 0x40) != 0;
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N = (l & 0x80) != 0;
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printf_unfiltered ("N-%d ", N);
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printf_unfiltered ("V-%d ", V);
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printf_unfiltered ("M-%d ", M);
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printf_unfiltered ("X-%d ", X);
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printf_unfiltered ("D-%d ", D);
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printf_unfiltered ("I-%d ", I);
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printf_unfiltered ("Z-%d ", Z);
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printf_unfiltered ("C-%d ", C);
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if ((C | Z) == 0)
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printf_unfiltered ("u> ");
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if ((C | Z) == 1)
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printf_unfiltered ("u<= ");
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if ((C == 0))
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printf_unfiltered ("u>= ");
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if (C == 1)
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printf_unfiltered ("u< ");
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if (Z == 0)
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printf_unfiltered ("!= ");
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if (Z == 1)
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printf_unfiltered ("== ");
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if ((N ^ V) == 0)
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printf_unfiltered (">= ");
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if ((N ^ V) == 1)
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printf_unfiltered ("< ");
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if ((Z | (N ^ V)) == 0)
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printf_unfiltered ("> ");
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if ((Z | (N ^ V)) == 1)
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printf_unfiltered ("<= ");
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}
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}
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void
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_initialize_w65_tdep ()
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{
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tm_print_insn = print_insn_w65;
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}
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