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target-m68k: Delay autoinc writeback

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Backports commit 8a1e52b69d2cd1c633f3c473a213d575931bf46d from qemu
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Richard Henderson 2018-03-01 11:18:30 -05:00 committed by Lioncash
parent c7ab1e782b
commit 5541553e8d
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 66 additions and 15 deletions
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81
qemu/target-m68k/translate.c
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@ -37,12 +37,12 @@
#define tcg_gen_qemu_ldf64 tcg_gen_qemu_ld64
#define tcg_gen_qemu_stf64 tcg_gen_qemu_st64
#define REG(insn, pos) (((insn) >> (pos)) & 7)
#define REG(insn, pos) (((insn) >> (pos)) & 7)
#define DREG(insn, pos) tcg_ctx->cpu_dregs[REG(insn, pos)]
#define AREG(insn, pos) tcg_ctx->cpu_aregs[REG(insn, pos)]
#define AREG(insn, pos) get_areg(s, REG(insn, pos))
#define FREG(insn, pos) tcg_ctx->cpu_fregs[REG(insn, pos)]
#define MACREG(acc) tcg_ctx->cpu_macc[acc]
#define QREG_SP tcg_ctx->cpu_aregs[7]
#define MACREG(acc) tcg_ctx->cpu_macc[acc]
#define QREG_SP tcg_ctx->cpu_aregs[7]
#define IS_NULL_QREG(t) (TCGV_EQUAL(t, tcg_ctx->NULL_QREG))
@ -113,11 +113,64 @@ typedef struct DisasContext {
int singlestep_enabled;
TCGv_i64 mactmp;
int done_mac;
int writeback_mask;
TCGv writeback[8];
// Unicorn engine
struct uc_struct *uc;
} DisasContext;
static TCGv get_areg(DisasContext *s, unsigned regno)
{
TCGContext *tcg_ctx = s->uc->tcg_ctx;
if (s->writeback_mask & (1 << regno)) {
return s->writeback[regno];
} else {
return tcg_ctx->cpu_aregs[regno];
}
}
static void delay_set_areg(DisasContext *s, unsigned regno,
TCGv val, bool give_temp)
{
TCGContext *tcg_ctx = s->uc->tcg_ctx;
if (s->writeback_mask & (1 << regno)) {
if (give_temp) {
tcg_temp_free(tcg_ctx, s->writeback[regno]);
s->writeback[regno] = val;
} else {
tcg_gen_mov_i32(tcg_ctx, s->writeback[regno], val);
}
} else {
s->writeback_mask |= 1 << regno;
if (give_temp) {
s->writeback[regno] = val;
} else {
TCGv tmp = tcg_temp_new(tcg_ctx);
s->writeback[regno] = tmp;
tcg_gen_mov_i32(tcg_ctx, tmp, val);
}
}
}
static void do_writebacks(DisasContext *s)
{
TCGContext *tcg_ctx = s->uc->tcg_ctx;
unsigned mask = s->writeback_mask;
if (mask) {
s->writeback_mask = 0;
do {
unsigned regno = ctz32(mask);
tcg_gen_mov_i32(tcg_ctx, tcg_ctx->cpu_aregs[regno], s->writeback[regno]);
tcg_temp_free(tcg_ctx, s->writeback[regno]);
mask &= mask - 1;
} while (mask);
}
}
#define DISAS_JUMP_NEXT 4
#if defined(CONFIG_USER_ONLY)
@ -751,10 +804,11 @@ static TCGv gen_ea(CPUM68KState *env, DisasContext *s, uint16_t insn,
case 3: /* Indirect postincrement. */
reg = AREG(insn, 0);
result = gen_ldst(s, opsize, reg, val, what);
/* ??? This is not exception safe. The instruction may still
fault after this point. */
if (what == EA_STORE || !addrp)
tcg_gen_addi_i32(tcg_ctx, reg, reg, opsize_bytes(opsize));
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);
}
return result;
case 4: /* Indirect predecrememnt. */
{
@ -769,11 +823,8 @@ static TCGv gen_ea(CPUM68KState *env, DisasContext *s, uint16_t insn,
*addrp = tmp;
}
result = gen_ldst(s, opsize, tmp, val, what);
/* ??? This is not exception safe. The instruction may still
fault after this point. */
if (what == EA_STORE || !addrp) {
reg = AREG(insn, 0);
tcg_gen_mov_i32(tcg_ctx, reg, tmp);
delay_set_areg(s, REG(insn, 0), tmp, false);
}
}
return result;
@ -3558,7 +3609,6 @@ void register_m68k_insns (CPUM68KState *env)
static void disas_m68k_insn(CPUM68KState * env, DisasContext *s)
{
TCGContext *tcg_ctx = s->uc->tcg_ctx;
uint16_t insn;
// Unicorn: end address tells us to stop emulation
if (s->pc == s->uc->addr_end) {
@ -3573,9 +3623,9 @@ static void disas_m68k_insn(CPUM68KState * env, DisasContext *s)
check_exit_request(tcg_ctx);
}
insn = read_im16(env, s);
uint16_t insn = read_im16(env, s);
((disas_proc)tcg_ctx->opcode_table[insn])(env, s, insn);
do_writebacks(s);
}
/* generate intermediate code for basic block 'tb'. */
@ -3606,6 +3656,7 @@ void gen_intermediate_code(CPUM68KState *env, TranslationBlock *tb)
dc->fpcr = env->fpcr;
dc->user = (env->sr & SR_S) == 0;
dc->done_mac = 0;
dc->writeback_mask = 0;
num_insns = 0;
max_insns = tb->cflags & CF_COUNT_MASK;
if (max_insns == 0) {