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binutils-gdb/opcodes/avr-dis.c

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/* Disassemble AVR instructions.
Copyright (C) 1999, 2000 Free Software Foundation, Inc.
Contributed by Denis Chertykov <denisc@overta.ru>
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 "dis-asm.h"
#include "opintl.h"
typedef unsigned char u8;
typedef unsigned short u16;
typedef unsigned long u32;
#define IFMASK(a,b) ((opcode & (a)) == (b))
static char* SREG_flags = "CZNVSHTI";
static char* sect94[] = {"COM","NEG","SWAP","INC","NULL","ASR","LSR","ROR",
0,0,"DEC",0,0,0,0,0};
static char* sect98[] = {"CBI","SBIC","SBI","SBIS"};
static char* branchs[] = {
"BRCS","BREQ","BRMI","BRVS",
"BRLT","BRHS","BRTS","BRIE",
"BRCC","BRNE","BRPL","BRVC",
"BRGE","BRHC","BRTC","BRID"
};
static char* last4[] = {"BLD","BST","SBRC","SBRS"};
static void dispLDD PARAMS ((u16, char *));
static void
dispLDD (opcode, dest)
u16 opcode;
char *dest;
{
opcode = (((opcode & 0x2000) >> 8) | ((opcode & 0x0c00) >> 7)
| (opcode & 7));
sprintf(dest, "%d", opcode);
}
static void regPP PARAMS ((u16, char *));
static void
regPP (opcode, dest)
u16 opcode;
char *dest;
{
opcode = ((opcode & 0x0600) >> 5) | (opcode & 0xf);
sprintf(dest, "0x%02X", opcode);
}
static void reg50 PARAMS ((u16, char *));
static void
reg50 (opcode, dest)
u16 opcode;
char *dest;
{
opcode = (opcode & 0x01f0) >> 4;
sprintf(dest, "R%d", opcode);
}
static void reg104 PARAMS ((u16, char *));
static void
reg104 (opcode, dest)
u16 opcode;
char *dest;
{
opcode = (opcode & 0xf) | ((opcode & 0x0200) >> 5);
sprintf(dest, "R%d", opcode);
}
static void reg40 PARAMS ((u16, char *));
static void
reg40 (opcode, dest)
u16 opcode;
char *dest;
{
opcode = (opcode & 0xf0) >> 4;
sprintf(dest, "R%d", opcode + 16);
}
static void reg20w PARAMS ((u16, char *));
static void
reg20w (opcode, dest)
u16 opcode;
char *dest;
{
opcode = (opcode & 0x30) >> 4;
sprintf(dest, "R%d", 24 + opcode * 2);
}
static void lit404 PARAMS ((u16, char *));
static void
lit404 (opcode, dest)
u16 opcode;
char *dest;
{
opcode = ((opcode & 0xf00) >> 4) | (opcode & 0xf);
sprintf(dest, "0x%02X", opcode);
}
static void lit204 PARAMS ((u16, char *));
static void
lit204 (opcode, dest)
u16 opcode;
char *dest;
{
opcode = ((opcode & 0xc0) >> 2) | (opcode & 0xf);
sprintf(dest, "0x%02X", opcode);
}
static void add0fff PARAMS ((u16, char *, int));
static void
add0fff (op, dest, pc)
u16 op;
char *dest;
int pc;
{
int rel_addr = (((op & 0xfff) ^ 0x800) - 0x800) * 2;
sprintf(dest, ".%+-8d ; 0x%06X", rel_addr, pc + 2 + rel_addr);
}
static void add03f8 PARAMS ((u16, char *, int));
static void
add03f8 (op, dest, pc)
u16 op;
char *dest;
int pc;
{
int rel_addr = ((((op >> 3) & 0x7f) ^ 0x40) - 0x40) * 2;
sprintf(dest, ".%+-8d ; 0x%06X", rel_addr, pc + 2 + rel_addr);
}
static u16 avrdis_opcode PARAMS ((bfd_vma, disassemble_info *));
static u16
avrdis_opcode (addr, info)
bfd_vma addr;
disassemble_info *info;
{
bfd_byte buffer[2];
int status;
status = info->read_memory_func(addr, buffer, 2, info);
if (status != 0)
{
info->memory_error_func(status, addr, info);
return -1;
}
return bfd_getl16 (buffer);
}
int
print_insn_avr(addr, info)
bfd_vma addr;
disassemble_info *info;
{
char rr[200];
char rd[200];
u16 opcode;
void *stream = info->stream;
fprintf_ftype prin = info->fprintf_func;
int cmd_len = 2;
opcode = avrdis_opcode (addr, info);
if (IFMASK(0xd000, 0x8000))
{
char letter;
reg50(opcode, rd);
dispLDD(opcode, rr);
if (opcode & 8)
letter = 'Y';
else
letter = 'Z';
if (opcode & 0x0200)
(*prin) (stream, " STD %c+%s,%s", letter, rr, rd);
else
(*prin) (stream, " LDD %s,%c+%s", rd, letter, rr);
}
else
{
switch (opcode & 0xf000)
{
case 0x0000:
{
reg50(opcode, rd);
reg104(opcode, rr);
switch (opcode & 0x0c00)
{
case 0x0000:
(*prin) (stream, " NOP");
break;
case 0x0400:
(*prin) (stream, " CPC %s,%s", rd, rr);
break;
case 0x0800:
(*prin) (stream, " SBC %s,%s", rd, rr);
break;
case 0x0c00:
(*prin) (stream, " ADD %s,%s", rd, rr);
break;
}
}
break;
case 0x1000:
{
reg50(opcode, rd);
reg104(opcode, rr);
switch (opcode & 0x0c00)
{
case 0x0000:
(*prin) (stream, " CPSE %s,%s", rd, rr);
break;
case 0x0400:
(*prin) (stream, " CP %s,%s", rd, rr);
break;
case 0x0800:
(*prin) (stream, " SUB %s,%s", rd, rr);
break;
case 0x0c00:
(*prin) (stream, " ADC %s,%s", rd, rr);
break;
}
}
break;
case 0x2000:
{
reg50(opcode, rd);
reg104(opcode, rr);
switch (opcode & 0x0c00)
{
case 0x0000:
(*prin) (stream, " AND %s,%s", rd, rr);
break;
case 0x0400:
(*prin) (stream, " EOR %s,%s", rd, rr);
break;
case 0x0800:
(*prin) (stream, " OR %s,%s", rd, rr);
break;
case 0x0c00:
(*prin) (stream, " MOV %s,%s", rd, rr);
break;
}
}
break;
case 0x3000:
{
reg40(opcode, rd);
lit404(opcode, rr);
(*prin) (stream, " CPI %s,%s", rd, rr);
}
break;
case 0x4000:
{
reg40(opcode, rd);
lit404(opcode, rr);
(*prin) (stream, " SBCI %s,%s", rd, rr);
}
break;
case 0x5000:
{
reg40(opcode, rd);
lit404(opcode, rr);
(*prin) (stream, " SUBI %s,%s", rd, rr);
}
break;
case 0x6000:
{
reg40(opcode, rd);
lit404(opcode, rr);
(*prin) (stream, " ORI %s,%s", rd, rr);
}
break;
case 0x7000:
{
reg40(opcode, rd);
lit404(opcode, rr);
(*prin) (stream, " ANDI %s,%s", rd, rr);
}
break;
case 0x9000:
{
switch (opcode & 0x0e00)
{
case 0x0000:
{
reg50(opcode, rd);
switch (opcode & 0xf)
{
case 0x0:
{
(*prin) (stream, " LDS %s,0x%04X", rd,
avrdis_opcode(addr + 2, info));
cmd_len = 4;
}
break;
case 0x1:
(*prin) (stream, " LD %s,Z+", rd);
break;
case 0x2:
(*prin) (stream, " LD %s,-Z", rd);
break;
case 0x9:
(*prin) (stream, " LD %s,Y+", rd);
break;
case 0xa:
(*prin) (stream, " LD %s,-Y", rd);
break;
case 0xc:
(*prin) (stream, " LD %s,X", rd);
break;
case 0xd:
(*prin) (stream, " LD %s,X+", rd);
break;
case 0xe:
(*prin) (stream, " LD %s,-X", rd);
break;
case 0xf:
(*prin) (stream, " POP %s", rd);
break;
default:
(*prin) (stream, " ????");
break;
}
}
break;
case 0x0200:
{
reg50(opcode, rd);
switch (opcode & 0xf)
{
case 0x0:
{
(*prin) (stream, " STS 0x%04X,%s",
avrdis_opcode(addr + 2, info), rd);
cmd_len = 4;
}
break;
case 0x1:
(*prin) (stream, " ST Z+,%s", rd);
break;
case 0x2:
(*prin) (stream, " ST -Z,%s", rd);
break;
case 0x9:
(*prin) (stream, " ST Y+,%s", rd);
break;
case 0xa:
(*prin) (stream, " ST -Y,%s", rd);
break;
case 0xc:
(*prin) (stream, " ST X,%s", rd);
break;
case 0xd:
(*prin) (stream, " ST X+,%s", rd);
break;
case 0xe:
(*prin) (stream, " ST -X,%s", rd);
break;
case 0xf:
(*prin) (stream, " PUSH %s", rd);
break;
default:
(*prin) (stream, " ????");
break;
}
}
break;
case 0x0400:
{
if (IFMASK(0x020c, 0x000c))
{
u32 k = ((opcode & 0x01f0) >> 3) | (opcode & 1);
k = (k << 16) | avrdis_opcode(addr + 2, info);
if (opcode & 0x0002)
(*prin) (stream, " CALL 0x%06X", k*2);
else
(*prin) (stream, " JMP 0x%06X", k*2);
cmd_len = 4;
}
else if (IFMASK(0x010f, 0x0008))
{
int sf = (opcode & 0x70) >> 4;
if (opcode & 0x0080)
(*prin) (stream, " CL%c", SREG_flags[sf]);
else
(*prin) (stream, " SE%c", SREG_flags[sf]);
}
else if (IFMASK(0x000f, 0x0009))
{
if (opcode & 0x0100)
(*prin) (stream, " ICALL");
else
(*prin) (stream, " IJMP");
}
else if (IFMASK(0x010f, 0x0108))
{
if (IFMASK(0x0090, 0x0000))
(*prin) (stream, " RET");
else if (IFMASK(0x0090, 0x0010))
(*prin) (stream, " RETI");
else if (IFMASK(0x00e0, 0x0080))
(*prin) (stream, " SLEEP");
else if (IFMASK(0x00e0, 0x00a0))
(*prin) (stream, " WDR");
else if (IFMASK(0x00f0, 0x00c0))
(*prin) (stream, " LPM");
else if (IFMASK(0x00f0, 0x00d0))
(*prin) (stream, " ELPM");
else
(*prin) (stream, " ????");
}
else
{
const char* p;
reg50(opcode, rd);
p = sect94[opcode & 0xf];
if (!p)
p = "????";
(*prin) (stream, " %-8s%s", p, rd);
}
}
break;
case 0x0600:
{
if (opcode & 0x0200)
{
lit204(opcode, rd);
reg20w(opcode, rr);
if (opcode & 0x0100)
(*prin) (stream, " SBIW %s,%s", rr, rd);
else
(*prin) (stream, " ADIW %s,%s", rr, rd);
}
}
break;
case 0x0800:
case 0x0a00:
{
(*prin) (stream, " %-8s0x%02X,%d",
sect98[(opcode & 0x0300) >> 8],
(opcode & 0xf8) >> 3,
opcode & 7);
}
break;
default:
{
reg50(opcode, rd);
reg104(opcode, rr);
(*prin) (stream, " MUL %s,%s", rd, rr);
}
}
}
break;
case 0xb000:
{
reg50(opcode, rd);
regPP(opcode, rr);
if (opcode & 0x0800)
(*prin) (stream, " OUT %s,%s", rr, rd);
else
(*prin) (stream, " IN %s,%s", rd, rr);
}
break;
case 0xc000:
{
add0fff(opcode, rd, addr);
(*prin) (stream, " RJMP %s", rd);
}
break;
case 0xd000:
{
add0fff(opcode, rd, addr);
(*prin) (stream, " RCALL %s", rd);
}
break;
case 0xe000:
{
reg40(opcode, rd);
lit404(opcode, rr);
(*prin) (stream, " LDI %s,%s", rd, rr);
}
break;
case 0xf000:
{
if (opcode & 0x0800)
{
reg50(opcode, rd);
(*prin) (stream, " %-8s%s,%d",
last4[(opcode & 0x0600) >> 9],
rd, opcode & 7);
}
else
{
char* p;
add03f8(opcode, rd, addr);
p = branchs[((opcode & 0x0400) >> 7) | (opcode & 7)];
(*prin) (stream, " %-8s%s", p, rd);
}
}
break;
}
}
return cmd_len;
}
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