/* 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; }