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instr.c
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#include <openssl/des.h>
#include "emu.h"
#include "instr.h"
static inline void
asr_flags8(uint8_t res, uint8_t rd, uint8_t *set, uint8_t *clr)
{
if (res & 0x80)
*set |= SREG_N;
else
*clr |= SREG_N;
if (res == 0)
*set |= SREG_Z;
else
*clr |= SREG_Z;
if (rd & 0x1)
*set |= SREG_C;
else
*clr |= SREG_C;
if (((*set & SREG_C) && (*clr & SREG_N)) ||
((*clr & SREG_C) && (*set & SREG_N)))
*set |= SREG_V;
else
*clr |= SREG_V;
if (((*set & SREG_V) && (*clr & SREG_N)) ||
((*clr & SREG_V) && (*set & SREG_N)))
*set |= SREG_S;
else
*clr |= SREG_S;
}
static inline void
logic_flags8(uint8_t result, uint8_t *setflags, uint8_t *clrflags)
{
*clrflags = SREG_V;
if (result & 0x80)
*setflags |= (SREG_N | SREG_S);
else
*clrflags |= (SREG_N | SREG_S);
if (result == 0)
*setflags |= SREG_Z;
else
*clrflags |= SREG_Z;
}
static inline void
mul_flags16(uint16_t res, uint8_t *set, uint8_t *clr)
{
if ((res & 0x8000) != 0)
*set |= SREG_C;
else
*clr |= SREG_C;
if (res == 0)
*set |= SREG_Z;
else
*clr |= SREG_Z;
}
static inline void
fmul_flags16(uint16_t res, uint8_t *set, uint8_t *clr)
{
if ((res & 0x8000) != 0)
*set |= SREG_C;
else
*clr |= SREG_C;
res <<= 1;
if (res == 0)
*set |= SREG_Z;
else
*clr |= SREG_Z;
}
static inline void
adc_flags8(uint8_t res, uint8_t rd, uint8_t rr, uint8_t *set, uint8_t *clr)
{
if (res & 0x80)
*set |= SREG_N;
else
*clr |= SREG_N;
if ((0x80 & rd & rr & ~res) ||
(0x80 & ~rd & ~rr & res))
*set |= SREG_V;
else
*clr |= SREG_V;
if (((*set & SREG_N) && (*clr & SREG_V)) ||
((*clr & SREG_N) && (*set & SREG_V)))
*set |= SREG_S;
else
*clr |= SREG_S;
if (res == 0)
*set |= SREG_Z;
else
*clr |= SREG_Z;
if ((0x80 & rd & rr) ||
(0x80 & rr & ~res) ||
(0x80 & ~res & rd))
*set |= SREG_C;
else
*clr |= SREG_C;
if ((0x08 & rd & rr) ||
(0x08 & rr & ~res) ||
(0x08 & ~res & rd))
*set |= SREG_H;
else
*clr |= SREG_H;
}
static inline void
adiw_flags16(uint16_t res, uint16_t rd, uint8_t *set, uint8_t *clr)
{
if (res & 0x8000)
*set |= SREG_N;
else
*clr |= SREG_N;
if (0x8000 & ~rd & res)
*set |= SREG_V;
else
*clr |= SREG_V;
if (((*set & SREG_N) && (*clr & SREG_V)) ||
((*clr & SREG_N) && (*set & SREG_V)))
*set |= SREG_S;
else
*clr |= SREG_S;
if (res == 0)
*set |= SREG_Z;
else
*clr |= SREG_Z;
if (0x8000 & ~res & rd)
*set |= SREG_C;
else
*clr |= SREG_C;
}
static inline void
sub_flags8(uint8_t res, uint8_t rd, uint8_t rr, uint8_t *set, uint8_t *clr)
{
if (res & 0x80)
*set |= SREG_N;
else
*clr |= SREG_N;
if ((0x80 & rd & ~rr & ~res) ||
(0x80 & ~rd & rr & res))
*set |= SREG_V;
else
*clr |= SREG_V;
if (((*set & SREG_N) && (*clr & SREG_V)) ||
((*clr & SREG_N) && (*set & SREG_V)))
*set |= SREG_S;
else
*clr |= SREG_S;
if (res == 0)
*set |= SREG_Z;
else
*clr |= SREG_Z;
if ((0x80 & ~rd & rr) ||
(0x80 & rr & res) ||
(0x80 & res & ~rd))
*set |= SREG_C;
else
*clr |= SREG_C;
if ((0x08 & ~rd & rr) ||
(0x08 & rr & res) ||
(0x08 & res & ~rd))
*set |= SREG_H;
else
*clr |= SREG_H;
}
static inline uint8_t
popbyte(void)
{
uint16_t sp;
sp = getsp();
setsp(sp + 1);
return (memory[sp + 1]);
}
static inline void
pushbyte(uint8_t b)
{
uint16_t sp;
sp = getsp();
memory[sp] = b;
setsp(sp - 1);
}
void
instr_adc(struct instr_decode_common *idc)
{
bool carry_mode;
uint8_t rr, rd, res;
carry_mode = bits(idc->instr, 12, 12);
rr = memory[idc->rrrrr];
rd = memory[idc->ddddd];
res = rd + rr;
if (carry_mode && (memory[SREG] & SREG_C) != 0)
res += 1;
memory[idc->ddddd] = res;
adc_flags8(res, rd, rr, &idc->setflags, &idc->clrflags);
}
void
instr_adiw(struct instr_decode_common *idc)
{
uint16_t imm, res, rd;
uint8_t dd;
dd = 24 + (bits(idc->instr, 5, 4) >> 3);
imm = (bits(idc->instr, 7, 6) >> 2) | bits(idc->instr, 3, 0);
rd = memword(dd);
res = rd + imm;
memwriteword(dd, res);
adiw_flags16(res, rd, &idc->setflags, &idc->clrflags);
}
void
instr_and(struct instr_decode_common *idc)
{
memory[idc->ddddd] &= memory[idc->rrrrr];
logic_flags8(memory[idc->ddddd], &idc->setflags, &idc->clrflags);
}
void
instr_andi(struct instr_decode_common *idc)
{
memory[idc->ddddd] &= idc->imm_u8;
logic_flags8(memory[idc->ddddd], &idc->setflags, &idc->clrflags);
}
void
instr_asr(struct instr_decode_common *idc)
{
uint8_t rd, res;
rd = memory[idc->ddddd];
res = (rd >> 1) | (0x80 & rd);
memory[idc->ddddd] = res;
asr_flags8(res, rd, &idc->setflags, &idc->clrflags);
}
void
instr_bclrset(struct instr_decode_common *idc)
{
uint8_t sss;
bool clr;
sss = idc->ddddd - 16;
clr = (idc->instr & 0x80);
if (clr)
idc->clrflags |= (1 << sss);
else
idc->setflags |= (1 << sss);
}
void
instr_bld(struct instr_decode_common *idc)
{
uint8_t sss;
sss = idc->rrrrr - 16;
if ((memory[SREG] & SREG_T) != 0)
memory[idc->ddddd] |= (1 << sss);
else
memory[idc->ddddd] &= ~(1 << sss);
}
void
instr_brb(struct instr_decode_common *idc)
{
uint8_t sss;
int8_t imm_s8;
bool clr;
sss = idc->rrrrr - 16;
clr = (idc->instr & 0x0400);
imm_s8 = (bits(idc->instr, 9, 3) >> 3);
if ((imm_s8 & 0x40) != 0)
imm_s8 |= 0x80;
if ((memory[SREG] & (1 << sss)) != 0 && !clr)
pc += imm_s8;
else if ((memory[SREG] & (1 << sss)) == 0 && clr)
pc += imm_s8;
}
void
instr_bst(struct instr_decode_common *idc)
{
uint8_t sss;
sss = idc->rrrrr - 16;
if ((memory[idc->ddddd] & (1 << sss)) != 0)
idc->setflags |= SREG_T;
else
idc->clrflags |= SREG_T;
}
void
instr_call(struct instr_decode_common *idc)
{
uint32_t addr, pc2;
addr = idc->imm_u16;
if (pc22)
addr |= (((uint32_t)
(bits(idc->instr, 8, 4) >> 3) |
bits(idc->instr, 0, 0)) << 16);
pc2 = pc_start + 2;
pushbyte(pc2 & 0xff);
pushbyte((pc2 >> 8) & 0xff);
if (pc22)
pushbyte(pc2 >> 16);
pc = addr - instr_size;
}
void
instr_cbisbi(struct instr_decode_common *idc)
{
bool set;
uint8_t sss, A;
sss = idc->rrrrr - 16;
set = (bits(idc->instr, 9, 9) != 0);
A = bits(idc->instr, 7, 3) >> 3;
if (set)
memory[IO_BASE + A] |= (1 << sss);
else
memory[IO_BASE + A] &= ~(1 << sss);
}
void
instr_com(struct instr_decode_common *idc)
{
uint8_t res, *set, *clr;
res = (0xff - memory[idc->ddddd]);
memory[idc->ddddd] = res;
set = &idc->setflags;
clr = &idc->clrflags;
*set |= SREG_C;
*clr |= SREG_V;
if (res == 0)
*set |= SREG_Z;
else
*clr |= SREG_Z;
if ((res & 0x80) != 0)
*set |= (SREG_N | SREG_S);
else
*clr |= (SREG_N | SREG_S);
}
/* CP, CPC, SUB, SBC */
void
instr_cpc(struct instr_decode_common *idc)
{
bool carry_mode, nostore;
uint8_t rr, rd, res;
carry_mode = (bits(idc->instr, 12, 12) == 0);
nostore = ((bits(idc->instr, 11, 10) >> 10) == 1);
rr = memory[idc->rrrrr];
rd = memory[idc->ddddd];
res = rd - rr;
if (carry_mode && (memory[SREG] & SREG_C) != 0)
res -= 1;
if (!nostore)
memory[idc->ddddd] = res;
sub_flags8(res, rd, rr, &idc->setflags, &idc->clrflags);
idc->setflags &= ~SREG_Z;
}
/* CPI, SBCI, SUBI */
void
instr_cpi(struct instr_decode_common *idc)
{
uint8_t rd, res;
bool store, carry;
store = ((bits(idc->instr, 14, 13) >> 13) == 2);
carry = (bits(idc->instr, 12, 12) == 0);
rd = memory[idc->ddddd];
res = rd - idc->imm_u8;
if (carry && (memory[SREG] & SREG_C) != 0)
res--;
if (store)
memory[idc->ddddd] = res;
sub_flags8(res, rd, idc->imm_u8, &idc->setflags, &idc->clrflags);
}
void
instr_cpse(struct instr_decode_common *idc)
{
if (memory[idc->ddddd] == memory[idc->rrrrr])
skip_next_instruction = true;
}
void
instr_dec(struct instr_decode_common *idc)
{
uint8_t rd, res;
res = memory[idc->ddddd] - 1;
memory[idc->ddddd] = res;
logic_flags8(res, &idc->setflags, &idc->clrflags);
if (res == 0x7f) {
idc->clrflags &= ~(SREG_V | SREG_S);
idc->setflags |= (SREG_V | SREG_S);
}
}
void
instr_des(struct instr_decode_common *idc)
{
DES_cblock key, inp, out;
DES_key_schedule ks;
idc->ddddd -= 16;
if (idc->ddddd < 15)
return;
memcpy(&key, &memory[8], sizeof(key));
memcpy(&inp, memory, sizeof(inp));
DES_set_key_unchecked(&key, &ks);
if ((memory[SREG] & SREG_H) != 0)
DES_ecb_encrypt(&inp, &out, &ks, DES_DECRYPT);
else
DES_ecb_encrypt(&inp, &out, &ks, DES_ENCRYPT);
memcpy(memory, &out, sizeof(out));
}
void
instr_eicalljump(struct instr_decode_common *idc)
{
uint32_t pc2, addr;
bool ext, call;
addr = memword(REGP_Z);
ext = bits(idc->instr, 4, 4);
call = bits(idc->instr, 8, 8);
if (ext && pc22)
addr |= ((uint32_t)memory[EIND] << 16);
else if (ext)
illins(idc->instr);
if (call) {
pc2 = pc_start + 1;
pushbyte(pc2 & 0xff);
pushbyte((pc2 >> 8) & 0xff);
if (pc22)
pushbyte(pc2 >> 16);
}
pc = addr - instr_size;
}
void
instr_elpm(struct instr_decode_common *idc)
{
uint32_t addr;
uint16_t word;
bool ext;
ext = bits(idc->instr, 4, 4);
addr = memword(REGP_Z);
if (ext)
addr |= ((uint32_t)memory[RAMPZ] << 16);
word = romword(addr >> 1);
if ((addr & 1) != 0)
memory[0] = (word >> 8);
else
memory[0] = (word & 0xff);
}
void
instr_elpmz(struct instr_decode_common *idc)
{
uint32_t addr;
uint16_t word;
bool ext, postinc;
ext = bits(idc->instr, 1, 1);
postinc = bits(idc->instr, 0, 0);
if (postinc && (idc->ddddd == 30 || idc->ddddd == 31)) {
printf("%s: ELPM r30, Z+ and ELPM r31, Z+ are documented as "
"undefined in the AVR Instruction set manual.\n",
__func__);
illins(idc->instr);
}
addr = memword(REGP_Z);
if (ext)
addr |= ((uint32_t)memory[RAMPZ] << 16);
word = romword(addr >> 1);
if ((addr & 1) != 0)
memory[idc->ddddd] = (word >> 8);
else
memory[idc->ddddd] = (word & 0xff);
if (postinc) {
addr++;
memwriteword(REGP_Z, addr & 0xffff);
}
}
void
instr_fmul(struct instr_decode_common *idc)
{
uint16_t res;
res = (uint16_t)memory[idc->ddddd] * (uint16_t)memory[idc->rrrrr];
fmul_flags16(res, &idc->setflags, &idc->clrflags);
res <<= 1;
memwriteword(0, res);
}
void
instr_fmulsu(struct instr_decode_common *idc)
{
int16_t rd, rr;
uint16_t res;
bool su;
su = bits(idc->instr, 3, 3);
rd = (int8_t)memory[idc->ddddd];
if (su)
rr = (uint8_t)memory[idc->rrrrr];
else
rr = (int8_t)memory[idc->rrrrr];
res = rd * rr;
fmul_flags16(res, &idc->setflags, &idc->clrflags);
res <<= 1;
memwriteword(0, res);
}
void
instr_in(struct instr_decode_common *idc)
{
uint8_t io_port;
io_port = (bits(idc->instr, 10, 9) >> 5) | bits(idc->instr, 3, 0);
memory[idc->ddddd] = memory[IO_BASE + io_port];
}
void
instr_inc(struct instr_decode_common *idc)
{
uint8_t rd, res;
res = memory[idc->ddddd] + 1;
memory[idc->ddddd] = res;
logic_flags8(res, &idc->setflags, &idc->clrflags);
if (res == 0x80) {
idc->clrflags &= ~SREG_V;
idc->clrflags |= SREG_S;
idc->setflags &= ~SREG_S;
idc->setflags |= SREG_V;
}
}
void
instr_jmp(struct instr_decode_common *idc)
{
uint32_t addr;
addr = idc->imm_u16;
if (pc22)
addr |= (((uint32_t)
(bits(idc->instr, 8, 4) >> 3) |
bits(idc->instr, 0, 0)) << 16);
pc = addr - instr_size;
}
void
instr_ldi(struct instr_decode_common *idc)
{
memory[idc->ddddd] = idc->imm_u8;
}
void
instr_lds(struct instr_decode_common *idc)
{
uint32_t addr, pc2;
addr = idc->imm_u16;
if (!pc_mem_max_64k)
addr |= ((uint32_t)memory[RAMPD] << 16);
memory[idc->ddddd] = memory[addr];
}
/*
* mode:
* 0: with displacement
* 1: postinc
* 2: predec
*
* displace:
* Always zero for X LD modes, but can be +[0, 63] for Y/Z modes.
*/
static inline void
instr_ldst_common(uint8_t rp, uint8_t extaddr, uint8_t mode, uint8_t displace,
const char *name, bool store, struct instr_decode_common *idc)
{
uint32_t addr;
bool predec, postinc;
predec = postinc = false;
switch (mode) {
case 1:
postinc = true;
break;
case 2:
predec = true;
break;
default:
break;
}
if ((predec || postinc) && (idc->ddddd == rp || idc->ddddd == rp + 1)) {
printf("%s: LD r%u, %s+/- and LD r%u, %s+/- are documented "
"as undefined in the AVR Instruction set manual.\n",
__func__, (uns)rp, name, (uns)rp + 1, name);
illins(idc->instr);
}
addr = memword(rp);
if (!pc_mem_max_64k)
addr |= ((uint32_t)memory[extaddr] << 16);
if (predec)
addr = (addr - 1) & 0xffffff;
if (!predec && !postinc)
addr = (addr + displace) & 0xffffff;
if (pc_mem_max_256b)
addr &= 0xff;
else if (pc_mem_max_64k)
addr &= 0xffff;
if (store)
memory[addr] = memory[idc->ddddd];
else
memory[idc->ddddd] = memory[addr];
if (postinc)
addr++;
if (postinc || predec) {
if (pc_mem_max_256b)
memory[rp] = (addr & 0xff);
else {
memwriteword(rp, addr & 0xffff);
if (!pc_mem_max_64k)
memory[extaddr] = (addr >> 16);
}
}
}
void
instr_ldx(struct instr_decode_common *idc)
{
instr_ldst_common(REGP_X, RAMPX, bits(idc->instr, 1, 0), 0, "X", false,
idc);
}
void
instr_ldyz(struct instr_decode_common *idc)
{
uint8_t displace, mode;
bool Y;
Y = bits(idc->instr, 3, 3);
if (bits(idc->instr, 12, 12) == 0) {
mode = 0;
displace = (bits(idc->instr, 13, 13) >> 8) |
(bits(idc->instr, 11, 10) >> 7) |
bits(idc->instr, 2, 0);
} else {
mode = bits(idc->instr, 1, 0);
displace = 0;
}
if (Y)
instr_ldst_common(REGP_Y, RAMPY, mode, displace, "Y", false,
idc);
else
instr_ldst_common(REGP_Z, RAMPZ, mode, displace, "Z", false,
idc);
}
void
instr_lsr(struct instr_decode_common *idc)
{
uint8_t rd, res;
rd = memory[idc->ddddd];
res = (rd >> 1);
memory[idc->ddddd] = res;
asr_flags8(res, rd, &idc->setflags, &idc->clrflags);
}
void
instr_mov(struct instr_decode_common *idc)
{
memory[idc->ddddd] = memory[idc->rrrrr];
}
void
instr_movw(struct instr_decode_common *idc)
{
uint8_t RRRR, DDDD;
DDDD = (idc->ddddd - 16) << 1;
RRRR = (idc->rrrrr - 16) << 1;
memwriteword(DDDD, memword(RRRR));
}
void
instr_mul(struct instr_decode_common *idc)
{
uint16_t res;
res = (uint16_t)memory[idc->ddddd] * (uint16_t)memory[idc->rrrrr];
memwriteword(0, res);
mul_flags16(res, &idc->setflags, &idc->clrflags);
}
void
instr_muls(struct instr_decode_common *idc)
{
uint16_t res;
int16_t rd, rs;
rd = (int8_t)memory[idc->ddddd];
rs = (int8_t)memory[idc->rrrrr];
res = rd * rs;
memwriteword(0, res);
mul_flags16(res, &idc->setflags, &idc->clrflags);
}
void
instr_mulsu(struct instr_decode_common *idc)
{
uint16_t res;
int16_t rd, rs;
rd = (int8_t)memory[idc->ddddd];
rs = (uint8_t)memory[idc->rrrrr];
res = rd * rs;
memwriteword(0, res);
mul_flags16(res, &idc->setflags, &idc->clrflags);
}
void
instr_neg(struct instr_decode_common *idc)
{
uint8_t rd, res, *set, *clr;
rd = memory[idc->ddddd];
res = (0u - rd) & 0xff;
memory[idc->ddddd] = res;
set = &idc->setflags;
clr = &idc->clrflags;
if (res == 0) {
*set |= SREG_Z;
*clr |= SREG_C;
} else {
*clr |= SREG_Z;
*set |= SREG_C;
}
if ((res & 0x80) != 0)
*set |= SREG_N;
else
*clr |= SREG_N;
if (res == 0x80)
*set |= SREG_V;
else
*clr |= SREG_V;
if ((res & 0x08) || (rd & 0x08))
*set |= SREG_H;
else
*clr |= SREG_H;
if (((*set & SREG_N) && (*clr & SREG_V)) ||
((*clr & SREG_N) && (*set & SREG_V)))
*set |= SREG_S;
else
*clr |= SREG_S;
}
void
instr_nop(struct instr_decode_common *idc __unused)
{
}
void
instr_or(struct instr_decode_common *idc)
{
memory[idc->ddddd] |= memory[idc->rrrrr];
logic_flags8(memory[idc->ddddd], &idc->setflags, &idc->clrflags);
}
void
instr_ori(struct instr_decode_common *idc)
{
memory[idc->ddddd] |= idc->imm_u8;
logic_flags8(memory[idc->ddddd], &idc->setflags, &idc->clrflags);
}
void
instr_out(struct instr_decode_common *idc)
{
uint8_t io_port;
io_port = (bits(idc->instr, 10, 9) >> 5) | bits(idc->instr, 3, 0);
memory[IO_BASE + io_port] = memory[idc->ddddd];
}
void
instr_pop(struct instr_decode_common *idc)
{
memory[idc->ddddd] = popbyte();
}
void
instr_push(struct instr_decode_common *idc)
{
pushbyte(memory[idc->ddddd]);
}
void
instr_rcalljmp(struct instr_decode_common *idc)
{
uint32_t pc2;
int16_t k;
bool call;
call = bits(idc->instr, 12, 12);
k = bits(idc->instr, 11, 0);
if ((k & 0x800) != 0)
k |= 0xf000;
if (call) {
pc2 = pc_start + 1;
pushbyte(pc2 & 0xff);
pushbyte((pc2 >> 8) & 0xff);
if (pc22)
pushbyte(pc2 >> 16);
}
pc = pc + k;
/* Implicit +1 from instr_size. */
}
static inline void
instr_ret_common(void)
{
uint32_t addr;
addr = ((uint32_t)popbyte() << 8);
addr |= popbyte();
if (pc22) {
addr <<= 8;
addr |= popbyte();
addr &= 0x3fffff;
}
pc = addr - instr_size;
}
void
instr_ret(struct instr_decode_common *idc __unused)
{
instr_ret_common();
}
void
instr_reti(struct instr_decode_common *idc __unused)
{
instr_ret_common();
memory[SREG] |= SREG_I;
}
void
instr_ror(struct instr_decode_common *idc)
{
uint8_t rd, res;
rd = memory[idc->ddddd];
res = (rd >> 1);
if ((memory[SREG] & SREG_C) != 0)
res |= 0x80;
memory[idc->ddddd] = res;
asr_flags8(res, rd, &idc->setflags, &idc->clrflags);
}
void
instr_sbics(struct instr_decode_common *idc)
{
uint8_t b, A;
bool ifset, bit;
ifset = (bits(idc->instr, 9, 9) != 0);
b = idc->rrrrr - 16;
A = (bits(idc->instr, 7, 3) >> 3);
bit = (memory[IO_BASE + A] & (1 << b));
if (ifset == bit)
skip_next_instruction = true;
}
void
instr_sbiw(struct instr_decode_common *idc)