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target-m68k: Split gen_lea and gen_ea

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Provide gen_lea_mode and gen_ea_mode, where the mode can be
specified manually, rather than taken from the instruction.

Backports commit f84aab269ddab8509b77408b886e9071bf5c48fb from qemu
This commit is contained in:
Richard Henderson 2018-03-01 11:26:43 -05:00 committed by Lioncash
parent 5541553e8d
commit e6ca471dda
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 59 additions and 54 deletions
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113
qemu/target-m68k/translate.c
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@ -696,8 +696,8 @@ static void gen_partset_reg(DisasContext *s, int opsize, TCGv reg, TCGv val)
/* Generate code for an "effective address". Does not adjust the base
register for autoincrement addressing modes. */
static TCGv gen_lea(CPUM68KState *env, DisasContext *s, uint16_t insn,
int opsize)
static TCGv gen_lea_mode(CPUM68KState *env, DisasContext *s,
int mode, int reg0, int opsize)
{
TCGContext *tcg_ctx = s->uc->tcg_ctx;
TCGv reg;
@ -705,29 +705,29 @@ static TCGv gen_lea(CPUM68KState *env, DisasContext *s, uint16_t insn,
uint16_t ext;
uint32_t offset;
switch ((insn >> 3) & 7) {
switch (mode) {
case 0: /* Data register direct. */
case 1: /* Address register direct. */
return tcg_ctx->NULL_QREG;
case 2: /* Indirect register */
case 3: /* Indirect postincrement. */
return AREG(insn, 0);
return get_areg(s, reg0);
case 4: /* Indirect predecrememnt. */
reg = AREG(insn, 0);
reg = get_areg(s, reg0);
tmp = tcg_temp_new(tcg_ctx);
tcg_gen_subi_i32(tcg_ctx, tmp, reg, opsize_bytes(opsize));
return tmp;
case 5: /* Indirect displacement. */
reg = AREG(insn, 0);
reg = get_areg(s, reg0);
tmp = tcg_temp_new(tcg_ctx);
ext = read_im16(env, s);
tcg_gen_addi_i32(tcg_ctx, tmp, reg, (int16_t)ext);
return tmp;
case 6: /* Indirect index + displacement. */
reg = AREG(insn, 0);
reg = get_areg(s, reg0);
return gen_lea_indexed(env, s, reg);
case 7: /* Other */
switch (insn & 7) {
switch (reg0) {
case 0: /* Absolute short. */
offset = (int16_t)read_im16(env, s);
return tcg_const_i32(tcg_ctx, offset);
@ -749,41 +749,27 @@ static TCGv gen_lea(CPUM68KState *env, DisasContext *s, uint16_t insn,
return tcg_ctx->NULL_QREG;
}
/* Helper function for gen_ea. Reuse the computed address between the
for read/write operands. */
static inline TCGv gen_ea_once(CPUM68KState *env, DisasContext *s,
uint16_t insn, int opsize, TCGv val,
TCGv *addrp, ea_what what)
static TCGv gen_lea(CPUM68KState *env, DisasContext *s, uint16_t insn,
int opsize)
{
TCGContext *tcg_ctx = s->uc->tcg_ctx;
TCGv tmp;
if (addrp && what == EA_STORE) {
tmp = *addrp;
} else {
tmp = gen_lea(env, s, insn, opsize);
if (IS_NULL_QREG(tmp))
return tmp;
if (addrp)
*addrp = tmp;
}
return gen_ldst(s, opsize, tmp, val, what);
int mode = extract32(insn, 3, 3);
int reg0 = REG(insn, 0);
return gen_lea_mode(env, s, mode, reg0, opsize);
}
/* Generate code to load/store a value from/into an EA. If VAL > 0 this is
/* Generate code to load/store a value from/into an EA. If WHAT > 0 this is
a write otherwise it is a read (0 == sign extend, -1 == zero extend).
ADDRP is non-null for readwrite operands. */
static TCGv gen_ea(CPUM68KState *env, DisasContext *s, uint16_t insn,
int opsize, TCGv val, TCGv *addrp, ea_what what)
static TCGv gen_ea_mode(CPUM68KState *env, DisasContext *s, int mode, int reg0,
int opsize, TCGv val, TCGv *addrp, ea_what what)
{
TCGContext *tcg_ctx = s->uc->tcg_ctx;
TCGv reg;
TCGv result;
uint32_t offset;
TCGv reg, tmp, result;
int32_t offset;
switch ((insn >> 3) & 7) {
switch (mode) {
case 0: /* Data register direct. */
reg = DREG(insn, 0);
reg = tcg_ctx->cpu_dregs[reg0];
if (what == EA_STORE) {
gen_partset_reg(s, opsize, reg, val);
return tcg_ctx->store_dummy;
@ -791,7 +777,7 @@ static TCGv gen_ea(CPUM68KState *env, DisasContext *s, uint16_t insn,
return gen_extend(s, reg, opsize, what == EA_LOADS);
}
case 1: /* Address register direct. */
reg = AREG(insn, 0);
reg = get_areg(s, reg0);
if (what == EA_STORE) {
tcg_gen_mov_i32(tcg_ctx, reg, val);
return tcg_ctx->store_dummy;
@ -799,45 +785,56 @@ static TCGv gen_ea(CPUM68KState *env, DisasContext *s, uint16_t insn,
return gen_extend(s, reg, opsize, what == EA_LOADS);
}
case 2: /* Indirect register */
reg = AREG(insn, 0);
reg = get_areg(s, reg0);
return gen_ldst(s, opsize, reg, val, what);
case 3: /* Indirect postincrement. */
reg = AREG(insn, 0);
reg = get_areg(s, reg0);
result = gen_ldst(s, opsize, reg, val, what);
if (what == EA_STORE || !addrp) {
TCGv tmp = tcg_temp_new(tcg_ctx);
tcg_gen_addi_i32(tcg_ctx, tmp, reg, opsize_bytes(opsize));
delay_set_areg(s, REG(insn, 0), tmp, true);
delay_set_areg(s, reg0, tmp, true);
}
return result;
case 4: /* Indirect predecrememnt. */
{
TCGv tmp;
if (addrp && what == EA_STORE) {
tmp = *addrp;
} else {
tmp = gen_lea(env, s, insn, opsize);
if (IS_NULL_QREG(tmp))
return tmp;
if (addrp)
*addrp = tmp;
if (addrp && what == EA_STORE) {
tmp = *addrp;
} else {
tmp = gen_lea_mode(env, s, mode, reg0, opsize);
if (IS_NULL_QREG(tmp)) {
return tmp;
}
result = gen_ldst(s, opsize, tmp, val, what);
if (what == EA_STORE || !addrp) {
delay_set_areg(s, REG(insn, 0), tmp, false);
if (addrp) {
*addrp = tmp;
}
}
result = gen_ldst(s, opsize, tmp, val, what);
if (what == EA_STORE || !addrp) {
delay_set_areg(s, reg0, tmp, false);
}
return result;
case 5: /* Indirect displacement. */
case 6: /* Indirect index + displacement. */
return gen_ea_once(env, s, insn, opsize, val, addrp, what);
do_indirect:
if (addrp && what == EA_STORE) {
tmp = *addrp;
} else {
tmp = gen_lea_mode(env, s, mode, reg0, opsize);
if (IS_NULL_QREG(tmp)) {
return tmp;
}
if (addrp) {
*addrp = tmp;
}
}
return gen_ldst(s, opsize, tmp, val, what);
case 7: /* Other */
switch (insn & 7) {
switch (reg0) {
case 0: /* Absolute short. */
case 1: /* Absolute long. */
case 2: /* pc displacement */
case 3: /* pc index+displacement. */
return gen_ea_once(env, s, insn, opsize, val, addrp, what);
goto do_indirect;
case 4: /* Immediate. */
/* Sign extend values for consistency. */
switch (opsize) {
@ -870,6 +867,14 @@ static TCGv gen_ea(CPUM68KState *env, DisasContext *s, uint16_t insn,
return tcg_ctx->NULL_QREG;
}
static TCGv gen_ea(CPUM68KState *env, DisasContext *s, uint16_t insn,
int opsize, TCGv val, TCGv *addrp, ea_what what)
{
int mode = extract32(insn, 3, 3);
int reg0 = REG(insn, 0);
return gen_ea_mode(env, s, mode, reg0, opsize, val, addrp, what);
}
typedef struct {
TCGCond tcond;
bool g1;