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[/] [openrisc/] [trunk/] [gnu-old/] [gdb-7.1/] [opcodes/] [z80-dis.c] - Rev 227
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/* Print Z80 and R800 instructions Copyright 2005, 2006, 2007, 2008 Free Software Foundation, Inc. Contributed by Arnold Metselaar <arnold_m@operamail.com> This file is part of the GNU opcodes library. This library 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 3, or (at your option) any later version. It 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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ #include "sysdep.h" #include "dis-asm.h" #include <stdio.h> struct buffer { bfd_vma base; int n_fetch; int n_used; signed char data[4]; } ; typedef int (*func)(struct buffer *, disassemble_info *, char *); struct tab_elt { unsigned char val; unsigned char mask; func fp; char * text; } ; #define TXTSIZ 24 /* Names of 16-bit registers. */ static char * rr_str[] = { "bc", "de", "hl", "sp" }; /* Names of 8-bit registers. */ static char * r_str[] = { "b", "c", "d", "e", "h", "l", "(hl)", "a" }; /* Texts for condition codes. */ static char * cc_str[] = { "nz", "z", "nc", "c", "po", "pe", "p", "m" }; /* Instruction names for 8-bit arithmetic, operand "a" is often implicit */ static char * arit_str[] = { "add a,", "adc a,", "sub ", "sbc a,", "and ", "xor ", "or ", "cp " } ; static int fetch_data (struct buffer *buf, disassemble_info * info, int n) { int r; if (buf->n_fetch + n > 4) abort (); r = info->read_memory_func (buf->base + buf->n_fetch, (unsigned char*) buf->data + buf->n_fetch, n, info); if (r == 0) buf->n_fetch += n; return !r; } static int prt (struct buffer *buf, disassemble_info * info, char *txt) { info->fprintf_func (info->stream, "%s", txt); buf->n_used = buf->n_fetch; return 1; } static int prt_e (struct buffer *buf, disassemble_info * info, char *txt) { char e; int target_addr; if (fetch_data (buf, info, 1)) { e = buf->data[1]; target_addr = (buf->base + 2 + e) & 0xffff; buf->n_used = buf->n_fetch; info->fprintf_func (info->stream, "%s0x%04x", txt, target_addr); } else buf->n_used = -1; return buf->n_used; } static int jr_cc (struct buffer *buf, disassemble_info * info, char *txt) { char mytxt[TXTSIZ]; snprintf (mytxt, TXTSIZ, txt, cc_str[(buf->data[0] >> 3) & 3]); return prt_e (buf, info, mytxt); } static int prt_nn (struct buffer *buf, disassemble_info * info, char *txt) { int nn; unsigned char *p; p = (unsigned char*) buf->data + buf->n_fetch; if (fetch_data (buf, info, 2)) { nn = p[0] + (p[1] << 8); info->fprintf_func (info->stream, txt, nn); buf->n_used = buf->n_fetch; } else buf->n_used = -1; return buf->n_used; } static int prt_rr_nn (struct buffer *buf, disassemble_info * info, char *txt) { char mytxt[TXTSIZ]; int rr; rr = (buf->data[buf->n_fetch - 1] >> 4) & 3; snprintf (mytxt, TXTSIZ, txt, rr_str[rr]); return prt_nn (buf, info, mytxt); } static int prt_rr (struct buffer *buf, disassemble_info * info, char *txt) { info->fprintf_func (info->stream, "%s%s", txt, rr_str[(buf->data[buf->n_fetch - 1] >> 4) & 3]); buf->n_used = buf->n_fetch; return buf->n_used; } static int prt_n (struct buffer *buf, disassemble_info * info, char *txt) { int n; unsigned char *p; p = (unsigned char*) buf->data + buf->n_fetch; if (fetch_data (buf, info, 1)) { n = p[0]; info->fprintf_func (info->stream, txt, n); buf->n_used = buf->n_fetch; } else buf->n_used = -1; return buf->n_used; } static int ld_r_n (struct buffer *buf, disassemble_info * info, char *txt) { char mytxt[TXTSIZ]; snprintf (mytxt, TXTSIZ, txt, r_str[(buf->data[0] >> 3) & 7]); return prt_n (buf, info, mytxt); } static int prt_r (struct buffer *buf, disassemble_info * info, char *txt) { info->fprintf_func (info->stream, txt, r_str[(buf->data[buf->n_fetch - 1] >> 3) & 7]); buf->n_used = buf->n_fetch; return buf->n_used; } static int ld_r_r (struct buffer *buf, disassemble_info * info, char *txt) { info->fprintf_func (info->stream, txt, r_str[(buf->data[buf->n_fetch - 1] >> 3) & 7], r_str[buf->data[buf->n_fetch - 1] & 7]); buf->n_used = buf->n_fetch; return buf->n_used; } static int arit_r (struct buffer *buf, disassemble_info * info, char *txt) { info->fprintf_func (info->stream, txt, arit_str[(buf->data[buf->n_fetch - 1] >> 3) & 7], r_str[buf->data[buf->n_fetch - 1] & 7]); buf->n_used = buf->n_fetch; return buf->n_used; } static int prt_cc (struct buffer *buf, disassemble_info * info, char *txt) { info->fprintf_func (info->stream, "%s%s", txt, cc_str[(buf->data[0] >> 3) & 7]); buf->n_used = buf->n_fetch; return buf->n_used; } static int pop_rr (struct buffer *buf, disassemble_info * info, char *txt) { static char *rr_stack[] = { "bc","de","hl","af"}; info->fprintf_func (info->stream, "%s %s", txt, rr_stack[(buf->data[0] >> 4) & 3]); buf->n_used = buf->n_fetch; return buf->n_used; } static int jp_cc_nn (struct buffer *buf, disassemble_info * info, char *txt) { char mytxt[TXTSIZ]; snprintf (mytxt,TXTSIZ, "%s%s,0x%%04x", txt, cc_str[(buf->data[0] >> 3) & 7]); return prt_nn (buf, info, mytxt); } static int arit_n (struct buffer *buf, disassemble_info * info, char *txt) { char mytxt[TXTSIZ]; snprintf (mytxt,TXTSIZ, txt, arit_str[(buf->data[0] >> 3) & 7]); return prt_n (buf, info, mytxt); } static int rst (struct buffer *buf, disassemble_info * info, char *txt) { info->fprintf_func (info->stream, txt, buf->data[0] & 0x38); buf->n_used = buf->n_fetch; return buf->n_used; } static int cis (struct buffer *buf, disassemble_info * info, char *txt ATTRIBUTE_UNUSED) { static char * opar[] = { "ld", "cp", "in", "out" }; char * op; char c; c = buf->data[1]; op = ((0x13 & c) == 0x13) ? "ot" : (opar[c & 3]); info->fprintf_func (info->stream, "%s%c%s", op, (c & 0x08) ? 'd' : 'i', (c & 0x10) ? "r" : ""); buf->n_used = 2; return buf->n_used; } static int dump (struct buffer *buf, disassemble_info * info, char *txt) { int i; info->fprintf_func (info->stream, "defb "); for (i = 0; txt[i]; ++i) info->fprintf_func (info->stream, i ? ", 0x%02x" : "0x%02x", (unsigned char) buf->data[i]); buf->n_used = i; return buf->n_used; } /* Table to disassemble machine codes with prefix 0xED. */ struct tab_elt opc_ed[] = { { 0x70, 0xFF, prt, "in f,(c)" }, { 0x70, 0xFF, dump, "xx" }, { 0x40, 0xC7, prt_r, "in %s,(c)" }, { 0x71, 0xFF, prt, "out (c),0" }, { 0x70, 0xFF, dump, "xx" }, { 0x41, 0xC7, prt_r, "out (c),%s" }, { 0x42, 0xCF, prt_rr, "sbc hl," }, { 0x43, 0xCF, prt_rr_nn, "ld (0x%%04x),%s" }, { 0x44, 0xFF, prt, "neg" }, { 0x45, 0xFF, prt, "retn" }, { 0x46, 0xFF, prt, "im 0" }, { 0x47, 0xFF, prt, "ld i,a" }, { 0x4A, 0xCF, prt_rr, "adc hl," }, { 0x4B, 0xCF, prt_rr_nn, "ld %s,(0x%%04x)" }, { 0x4D, 0xFF, prt, "reti" }, { 0x4F, 0xFF, prt, "ld r,a" }, { 0x56, 0xFF, prt, "im 1" }, { 0x57, 0xFF, prt, "ld a,i" }, { 0x5E, 0xFF, prt, "im 2" }, { 0x5F, 0xFF, prt, "ld a,r" }, { 0x67, 0xFF, prt, "rrd" }, { 0x6F, 0xFF, prt, "rld" }, { 0xA0, 0xE4, cis, "" }, { 0xC3, 0xFF, prt, "muluw hl,bc" }, { 0xC5, 0xE7, prt_r, "mulub a,%s" }, { 0xF3, 0xFF, prt, "muluw hl,sp" }, { 0x00, 0x00, dump, "xx" } }; static int pref_ed (struct buffer * buf, disassemble_info * info, char* txt ATTRIBUTE_UNUSED) { struct tab_elt *p; if (fetch_data(buf, info, 1)) { for (p = opc_ed; p->val != (buf->data[1] & p->mask); ++p) ; p->fp (buf, info, p->text); } else buf->n_used = -1; return buf->n_used; } /* Instruction names for the instructions addressing single bits. */ static char *cb1_str[] = { "", "bit", "res", "set"}; /* Instruction names for shifts and rotates. */ static char *cb2_str[] = { "rlc", "rrc", "rl", "rr", "sla", "sra", "sli", "srl" }; static int pref_cb (struct buffer * buf, disassemble_info * info, char* txt ATTRIBUTE_UNUSED) { if (fetch_data (buf, info, 1)) { buf->n_used = 2; if ((buf->data[1] & 0xc0) == 0) info->fprintf_func (info->stream, "%s %s", cb2_str[(buf->data[1] >> 3) & 7], r_str[buf->data[1] & 7]); else info->fprintf_func (info->stream, "%s %d,%s", cb1_str[(buf->data[1] >> 6) & 3], (buf->data[1] >> 3) & 7, r_str[buf->data[1] & 7]); } else buf->n_used = -1; return buf->n_used; } static int addvv (struct buffer * buf, disassemble_info * info, char* txt) { info->fprintf_func (info->stream, "add %s,%s", txt, txt); return buf->n_used = buf->n_fetch; } static int ld_v_v (struct buffer * buf, disassemble_info * info, char* txt) { char mytxt[TXTSIZ]; snprintf (mytxt, TXTSIZ, "ld %s%%s,%s%%s", txt, txt); return ld_r_r (buf, info, mytxt); } static int prt_d (struct buffer *buf, disassemble_info * info, char *txt) { int d; signed char *p; p = buf->data + buf->n_fetch; if (fetch_data (buf, info, 1)) { d = p[0]; info->fprintf_func (info->stream, txt, d); buf->n_used = buf->n_fetch; } else buf->n_used = -1; return buf->n_used; } static int prt_d_n (struct buffer *buf, disassemble_info * info, char *txt) { char mytxt[TXTSIZ]; int d; signed char *p; p = buf->data + buf->n_fetch; if (fetch_data (buf, info, 1)) { d = p[0]; snprintf (mytxt, TXTSIZ, txt, d); return prt_n (buf, info, mytxt); } else buf->n_used = -1; return buf->n_used; } static int arit_d (struct buffer *buf, disassemble_info * info, char *txt) { char mytxt[TXTSIZ]; signed char c; c = buf->data[buf->n_fetch - 1]; snprintf (mytxt, TXTSIZ, txt, arit_str[(c >> 3) & 7]); return prt_d (buf, info, mytxt); } static int ld_r_d (struct buffer *buf, disassemble_info * info, char *txt) { char mytxt[TXTSIZ]; signed char c; c = buf->data[buf->n_fetch - 1]; snprintf (mytxt, TXTSIZ, txt, r_str[(c >> 3) & 7]); return prt_d (buf, info, mytxt); } static int ld_d_r(struct buffer *buf, disassemble_info * info, char *txt) { char mytxt[TXTSIZ]; signed char c; c = buf->data[buf->n_fetch - 1]; snprintf (mytxt, TXTSIZ, txt, r_str[c & 7]); return prt_d (buf, info, mytxt); } static int pref_xd_cb (struct buffer * buf, disassemble_info * info, char* txt) { if (fetch_data (buf, info, 2)) { int d; char arg[TXTSIZ]; signed char *p; buf->n_used = 4; p = buf->data; d = p[2]; if (((p[3] & 0xC0) == 0x40) || ((p[3] & 7) == 0x06)) snprintf (arg, TXTSIZ, "(%s%+d)", txt, d); else snprintf (arg, TXTSIZ, "(%s%+d),%s", txt, d, r_str[p[3] & 7]); if ((p[3] & 0xc0) == 0) info->fprintf_func (info->stream, "%s %s", cb2_str[(buf->data[3] >> 3) & 7], arg); else info->fprintf_func (info->stream, "%s %d,%s", cb1_str[(buf->data[3] >> 6) & 3], (buf->data[3] >> 3) & 7, arg); } else buf->n_used = -1; return buf->n_used; } /* Table to disassemble machine codes with prefix 0xDD or 0xFD. */ static struct tab_elt opc_ind[] = { { 0x24, 0xF7, prt_r, "inc %s%%s" }, { 0x25, 0xF7, prt_r, "dec %s%%s" }, { 0x26, 0xF7, ld_r_n, "ld %s%%s,0x%%%%02x" }, { 0x21, 0xFF, prt_nn, "ld %s,0x%%04x" }, { 0x22, 0xFF, prt_nn, "ld (0x%%04x),%s" }, { 0x2A, 0xFF, prt_nn, "ld %s,(0x%%04x)" }, { 0x23, 0xFF, prt, "inc %s" }, { 0x2B, 0xFF, prt, "dec %s" }, { 0x29, 0xFF, addvv, "%s" }, { 0x09, 0xCF, prt_rr, "add %s," }, { 0x34, 0xFF, prt_d, "inc (%s%%+d)" }, { 0x35, 0xFF, prt_d, "dec (%s%%+d)" }, { 0x36, 0xFF, prt_d_n, "ld (%s%%+d),0x%%%%02x" }, { 0x76, 0xFF, dump, "h" }, { 0x46, 0xC7, ld_r_d, "ld %%s,(%s%%%%+d)" }, { 0x70, 0xF8, ld_d_r, "ld (%s%%%%+d),%%s" }, { 0x64, 0xF6, ld_v_v, "%s" }, { 0x60, 0xF0, ld_r_r, "ld %s%%s,%%s" }, { 0x44, 0xC6, ld_r_r, "ld %%s,%s%%s" }, { 0x86, 0xC7, arit_d, "%%s(%s%%%%+d)" }, { 0x84, 0xC6, arit_r, "%%s%s%%s" }, { 0xE1, 0xFF, prt, "pop %s" }, { 0xE5, 0xFF, prt, "push %s" }, { 0xCB, 0xFF, pref_xd_cb, "%s" }, { 0xE3, 0xFF, prt, "ex (sp),%s" }, { 0xE9, 0xFF, prt, "jp (%s)" }, { 0xF9, 0xFF, prt, "ld sp,%s" }, { 0x00, 0x00, dump, "?" }, } ; static int pref_ind (struct buffer * buf, disassemble_info * info, char* txt) { if (fetch_data (buf, info, 1)) { char mytxt[TXTSIZ]; struct tab_elt *p; for (p = opc_ind; p->val != (buf->data[1] & p->mask); ++p) ; snprintf (mytxt, TXTSIZ, p->text, txt); p->fp (buf, info, mytxt); } else buf->n_used = -1; return buf->n_used; } /* Table to disassemble machine codes without prefix. */ static struct tab_elt opc_main[] = { { 0x00, 0xFF, prt, "nop" }, { 0x01, 0xCF, prt_rr_nn, "ld %s,0x%%04x" }, { 0x02, 0xFF, prt, "ld (bc),a" }, { 0x03, 0xCF, prt_rr, "inc " }, { 0x04, 0xC7, prt_r, "inc %s" }, { 0x05, 0xC7, prt_r, "dec %s" }, { 0x06, 0xC7, ld_r_n, "ld %s,0x%%02x" }, { 0x07, 0xFF, prt, "rlca" }, { 0x08, 0xFF, prt, "ex af,af'" }, { 0x09, 0xCF, prt_rr, "add hl," }, { 0x0A, 0xFF, prt, "ld a,(bc)" }, { 0x0B, 0xCF, prt_rr, "dec " }, { 0x0F, 0xFF, prt, "rrca" }, { 0x10, 0xFF, prt_e, "djnz " }, { 0x12, 0xFF, prt, "ld (de),a" }, { 0x17, 0xFF, prt, "rla" }, { 0x18, 0xFF, prt_e, "jr "}, { 0x1A, 0xFF, prt, "ld a,(de)" }, { 0x1F, 0xFF, prt, "rra" }, { 0x20, 0xE7, jr_cc, "jr %s,"}, { 0x22, 0xFF, prt_nn, "ld (0x%04x),hl" }, { 0x27, 0xFF, prt, "daa"}, { 0x2A, 0xFF, prt_nn, "ld hl,(0x%04x)" }, { 0x2F, 0xFF, prt, "cpl" }, { 0x32, 0xFF, prt_nn, "ld (0x%04x),a" }, { 0x37, 0xFF, prt, "scf" }, { 0x3A, 0xFF, prt_nn, "ld a,(0x%04x)" }, { 0x3F, 0xFF, prt, "ccf" }, { 0x76, 0xFF, prt, "halt" }, { 0x40, 0xC0, ld_r_r, "ld %s,%s"}, { 0x80, 0xC0, arit_r, "%s%s" }, { 0xC0, 0xC7, prt_cc, "ret " }, { 0xC1, 0xCF, pop_rr, "pop" }, { 0xC2, 0xC7, jp_cc_nn, "jp " }, { 0xC3, 0xFF, prt_nn, "jp 0x%04x" }, { 0xC4, 0xC7, jp_cc_nn, "call " }, { 0xC5, 0xCF, pop_rr, "push" }, { 0xC6, 0xC7, arit_n, "%s0x%%02x" }, { 0xC7, 0xC7, rst, "rst 0x%02x" }, { 0xC9, 0xFF, prt, "ret" }, { 0xCB, 0xFF, pref_cb, "" }, { 0xCD, 0xFF, prt_nn, "call 0x%04x" }, { 0xD3, 0xFF, prt_n, "out (0x%02x),a" }, { 0xD9, 0xFF, prt, "exx" }, { 0xDB, 0xFF, prt_n, "in a,(0x%02x)" }, { 0xDD, 0xFF, pref_ind, "ix" }, { 0xE3, 0xFF, prt, "ex (sp),hl" }, { 0xE9, 0xFF, prt, "jp (hl)" }, { 0xEB, 0xFF, prt, "ex de,hl" }, { 0xED, 0xFF, pref_ed, ""}, { 0xF3, 0xFF, prt, "di" }, { 0xF9, 0xFF, prt, "ld sp,hl" }, { 0xFB, 0xFF, prt, "ei" }, { 0xFD, 0xFF, pref_ind, "iy" }, { 0x00, 0x00, prt, "????" }, } ; int print_insn_z80 (bfd_vma addr, disassemble_info * info) { struct buffer buf; struct tab_elt *p; buf.base = addr; buf.n_fetch = 0; buf.n_used = 0; if (! fetch_data (& buf, info, 1)) return -1; for (p = opc_main; p->val != (buf.data[0] & p->mask); ++p) ; p->fp (& buf, info, p->text); return buf.n_used; }
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