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NetBSD/gnu/dist/opcodes/sh-dis.c

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6.5 KiB
C
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/* Disassemble SH instructions.
Copyright (C) 1993, 1995 Free Software Foundation, Inc.
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 <stdio.h>
#define STATIC_TABLE
#define DEFINE_TABLE
#include "sh-opc.h"
#include "dis-asm.h"
#define LITTLE_BIT 2
static int
print_insn_shx(memaddr, info)
bfd_vma memaddr;
struct disassemble_info *info;
{
fprintf_ftype fprintf = info->fprintf_func;
void *stream = info->stream;
unsigned char insn[2];
unsigned char nibs[4];
int status;
int relmask = ~0;
sh_opcode_info *op;
status = info->read_memory_func(memaddr, insn, 2, info);
if (status != 0)
{
info->memory_error_func(status, memaddr, info);
return -1;
}
if (info->flags & LITTLE_BIT)
{
nibs[0] = (insn[1] >> 4) & 0xf;
nibs[1] = insn[1] & 0xf;
nibs[2] = (insn[0] >> 4) & 0xf;
nibs[3] = insn[0] & 0xf;
}
else
{
nibs[0] = (insn[0] >> 4) & 0xf;
nibs[1] = insn[0] & 0xf;
nibs[2] = (insn[1] >> 4) & 0xf;
nibs[3] = insn[1] & 0xf;
}
for (op = sh_table; op->name; op++)
{
int n;
int imm;
int rn;
int rm;
int rb;
for (n = 0; n < 4; n++) {
int i = op->nibbles[n];
if (i < 16)
{
if (nibs[n] == i) continue;
goto fail;
}
switch (i)
{
case BRANCH_8:
imm = (nibs[2] << 4) | (nibs[3]);
if (imm & 0x80)
imm |= ~0xff;
imm = ((char)imm) * 2 + 4 ;
goto ok;
case BRANCH_12:
imm = ((nibs[1]) << 8) | (nibs[2] << 4) | (nibs[3]);
if (imm & 0x800)
imm |= ~0xfff;
imm = imm * 2 + 4;
goto ok;
case IMM_4:
imm = nibs[3];
goto ok;
case IMM_4BY2:
imm = nibs[3] <<1;
goto ok;
case IMM_4BY4:
imm = nibs[3] <<2;
goto ok;
case IMM_8:
imm = (nibs[2] << 4) | nibs[3];
goto ok;
case PCRELIMM_8BY2:
imm = ((nibs[2] << 4) | nibs[3]) <<1;
relmask = ~1;
goto ok;
case PCRELIMM_8BY4:
imm = ((nibs[2] << 4) | nibs[3]) <<2;
relmask = ~3;
goto ok;
case IMM_8BY2:
imm = ((nibs[2] << 4) | nibs[3]) <<1;
goto ok;
case IMM_8BY4:
imm = ((nibs[2] << 4) | nibs[3]) <<2;
goto ok;
case DISP_8:
imm = (nibs[2] << 4) | (nibs[3]);
goto ok;
case DISP_4:
imm = nibs[3];
goto ok;
case REG_N:
rn = nibs[n];
break;
case REG_M:
rm = nibs[n];
break;
case REG_B:
rb = nibs[n] & 0x07;
break;
default:
abort();
}
}
ok:
fprintf(stream,"%s\t", op->name);
for (n = 0; n < 3 && op->arg[n] != A_END; n++)
{
if (n && op->arg[1] != A_END)
fprintf(stream,",");
switch (op->arg[n])
{
case A_IMM:
fprintf(stream,"#%d", (char)(imm));
break;
case A_R0:
fprintf(stream,"r0");
break;
case A_REG_N:
fprintf(stream,"r%d", rn);
break;
case A_INC_N:
fprintf(stream,"@r%d+", rn);
break;
case A_DEC_N:
fprintf(stream,"@-r%d", rn);
break;
case A_IND_N:
fprintf(stream,"@r%d", rn);
break;
case A_DISP_REG_N:
fprintf(stream,"@(%d,r%d)",imm, rn);
break;
case A_REG_M:
fprintf(stream,"r%d", rm);
break;
case A_INC_M:
fprintf(stream,"@r%d+", rm);
break;
case A_DEC_M:
fprintf(stream,"@-r%d", rm);
break;
case A_IND_M:
fprintf(stream,"@r%d", rm);
break;
case A_DISP_REG_M:
fprintf(stream,"@(%d,r%d)",imm, rm);
break;
case A_REG_B:
fprintf(stream,"r%d_bank", rb);
break;
case A_DISP_PC:
fprintf(stream,"0x%0x", imm+ 4+(memaddr&relmask));
break;
case A_IND_R0_REG_N:
fprintf(stream,"@(r0,r%d)", rn);
break;
case A_IND_R0_REG_M:
fprintf(stream,"@(r0,r%d)", rm);
break;
case A_DISP_GBR:
fprintf(stream,"@(%d,gbr)",imm);
break;
case A_R0_GBR:
fprintf(stream,"@(r0,gbr)");
break;
case A_BDISP12:
case A_BDISP8:
(*info->print_address_func) (imm + memaddr, info);
break;
case A_SR:
fprintf(stream,"sr");
break;
case A_GBR:
fprintf(stream,"gbr");
break;
case A_VBR:
fprintf(stream,"vbr");
break;
case A_SSR:
fprintf(stream,"ssr");
break;
case A_SPC:
fprintf(stream,"spc");
break;
case A_MACH:
fprintf(stream,"mach");
break;
case A_MACL:
fprintf(stream,"macl");
break;
case A_PR:
fprintf(stream,"pr");
break;
case F_REG_N:
fprintf(stream,"fr%d", rn);
break;
case F_REG_M:
fprintf(stream,"fr%d", rm);
break;
case FPSCR_M:
case FPSCR_N:
fprintf(stream,"fpscr");
break;
case FPUL_M:
case FPUL_N:
fprintf(stream,"fpul");
break;
case F_FR0:
fprintf(stream,"fr0");
break;
default:
abort();
}
}
if (!(info->flags & 1)
&& (op->name[0] == 'j'
|| (op->name[0] == 'b'
&& (op->name[1] == 'r'
|| op->name[1] == 's'))
|| (op->name[0] == 'r' && op->name[1] == 't')
|| (op->name[0] == 'b' && op->name[2] == '.')))
{
info->flags |= 1;
fprintf(stream,"\t(slot "); print_insn_shx(memaddr +2, info);
info->flags &= ~1;
fprintf(stream,")");
return 4;
}
return 2;
fail:
;
}
fprintf(stream,".word 0x%x%x%x%x", nibs[0], nibs[1], nibs[2], nibs[3]);
return 2;
}
int
print_insn_shl(memaddr, info)
bfd_vma memaddr;
struct disassemble_info *info;
{
int r;
info->flags = LITTLE_BIT;
r =print_insn_shx (memaddr, info);
return r;
}
int
print_insn_sh(memaddr, info)
bfd_vma memaddr;
struct disassemble_info *info;
{
int r;
info->flags = 0;
r =print_insn_shx (memaddr, info);
return r;
}
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