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target-m68k: Implement 680x0 movem

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680x0 movem can load/store words and long words and can use more
addressing modes. Coldfire can only use long words with (Ax) and
(d16,Ax) addressing modes.

Backports commit 7b542eb96d7d5d9266a9c0425f05d49c8e6df2f9 from qemu
This commit is contained in:
Laurent Vivier 2018-03-01 12:00:26 -05:00 committed by Lioncash
parent 2d318da080
commit 90b0b6d867
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 108 additions and 23 deletions
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129
qemu/target-m68k/translate.c
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@ -1677,41 +1677,124 @@ static void gen_push(DisasContext *s, TCGv val)
tcg_gen_mov_i32(tcg_ctx, QREG_SP, tmp);
}
static TCGv mreg(DisasContext *s, int reg)
{
TCGContext *tcg_ctx = s->uc->tcg_ctx;
if (reg < 8) {
/* Dx */
return tcg_ctx->cpu_dregs[reg];
}
/* Ax */
return tcg_ctx->cpu_aregs[reg & 7];
}
DISAS_INSN(movem)
{
TCGContext *tcg_ctx = s->uc->tcg_ctx;
TCGv addr;
TCGv addr, incr, tmp, r[16];
int is_load = (insn & 0x0400) != 0;
int opsize = (insn & 0x40) != 0 ? OS_LONG : OS_WORD;
uint16_t mask = read_im16(env, s);
int mode = extract32(insn, 3, 3);
int reg0 = REG(insn, 0);
int i;
uint16_t mask;
TCGv reg;
TCGv tmp;
int is_load;
mask = read_im16(env, s);
tmp = gen_lea(env, s, insn, OS_LONG);
if (IS_NULL_QREG(tmp)) {
tmp = tcg_ctx->cpu_aregs[reg0];
switch (mode) {
case 0: /* data register direct */
case 1: /* addr register direct */
do_addr_fault:
gen_addr_fault(s);
return;
case 2: /* indirect */
break;
case 3: /* indirect post-increment */
if (!is_load) {
/* post-increment is not allowed */
goto do_addr_fault;
}
break;
case 4: /* indirect pre-decrement */
if (is_load) {
/* pre-decrement is not allowed */
goto do_addr_fault;
}
/* We want a bare copy of the address reg, without any pre-decrement
adjustment, as gen_lea would provide. */
break;
default:
tmp = gen_lea_mode(env, s, mode, reg0, opsize);
if (IS_NULL_QREG(tmp)) {
goto do_addr_fault;
}
break;
}
addr = tcg_temp_new(tcg_ctx);
tcg_gen_mov_i32(tcg_ctx, addr, tmp);
is_load = ((insn & 0x0400) != 0);
for (i = 0; i < 16; i++, mask >>= 1) {
if (mask & 1) {
if (i < 8)
reg = DREG(i, 0);
else
reg = AREG(i, 0);
incr = tcg_const_i32(tcg_ctx, opsize_bytes(opsize));
if (is_load) {
tmp = gen_load(s, OS_LONG, addr, 0);
tcg_gen_mov_i32(tcg_ctx, reg, tmp);
/* memory to register */
for (i = 0; i < 16; i++) {
if (mask & (1 << i)) {
r[i] = gen_load(s, opsize, addr, 1);
tcg_gen_add_i32(tcg_ctx, addr, addr, incr);
}
}
for (i = 0; i < 16; i++) {
if (mask & (1 << i)) {
tcg_gen_mov_i32(tcg_ctx, mreg(s, i), r[i]);
tcg_temp_free(tcg_ctx, r[i]);
}
}
if (mode == 3) {
/* post-increment: movem (An)+,X */
tcg_gen_mov_i32(tcg_ctx, tcg_ctx->cpu_aregs[reg0], addr);
}
} else {
gen_store(s, OS_LONG, addr, reg);
}
if (mask != 1)
tcg_gen_addi_i32(tcg_ctx, addr, addr, 4);
/* register to memory */
if (mode == 4) {
/* pre-decrement: movem X,-(An) */
for (i = 15; i >= 0; i--) {
if ((mask << i) & 0x8000) {
tcg_gen_sub_i32(tcg_ctx, addr, addr, incr);
if (reg0 + 8 == i &&
m68k_feature(s->env, M68K_FEATURE_EXT_FULL)) {
/* M68020+: if the addressing register is the
* register moved to memory, the value written
* is the initial value decremented by the size of
* the operation, regardless of how many actual
* stores have been performed until this point.
* M68000/M68010: the value is the initial value.
*/
tmp = tcg_temp_new(tcg_ctx);
tcg_gen_sub_i32(tcg_ctx, tmp, tcg_ctx->cpu_aregs[reg0], incr);
gen_store(s, opsize, addr, tmp);
tcg_temp_free(tcg_ctx, tmp);
} else {
gen_store(s, opsize, addr, mreg(s, i));
}
}
}
tcg_gen_mov_i32(tcg_ctx, tcg_ctx->cpu_aregs[reg0], addr);
} else {
for (i = 0; i < 16; i++) {
if (mask & (1 << i)) {
gen_store(s, opsize, addr, mreg(s, i));
tcg_gen_add_i32(tcg_ctx, addr, addr, incr);
}
}
}
}
tcg_temp_free(tcg_ctx, incr);
tcg_temp_free(tcg_ctx, addr);
}
DISAS_INSN(bitop_im)
@ -3954,7 +4037,9 @@ void register_m68k_insns (CPUM68KState *env)
BASE(pea, 4840, ffc0);
BASE(swap, 4840, fff8);
INSN(bkpt, 4848, fff8, BKPT);
BASE(movem, 48c0, fbc0);
INSN(movem, 48d0, fbf8, CF_ISA_A);
INSN(movem, 48e8, fbf8, CF_ISA_A);
INSN(movem, 4880, fb80, M68000);
BASE(ext, 4880, fff8);
BASE(ext, 48c0, fff8);
BASE(ext, 49c0, fff8);