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target-m68k: Reorg flags handling

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Separate all ccr bits.  Continue to batch updates via cc_op.

Signed-off-by: Richard Henderson <rth@twiddle.net>

Fix gen_logic_cc() to really extend the size of the result.
Fix gen_get_ccr(): update cc_op as it is used by the helper.
Factorize flags computing and src/ccr cleanup

Signed-off-by: Laurent Vivier <laurent@vivier.eu>

target-m68k: sr/ccr cleanup

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Richard Henderson 2015-08-14 07:59:20 -07:00 committed by Laurent Vivier
parent 18dd87f26b
commit 620c6cf665
7 changed files with 361 additions and 499 deletions
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2
target-m68k/cpu.c
View File

@ -58,7 +58,7 @@ static void m68k_cpu_reset(CPUState *s)
#endif
m68k_switch_sp(env);
/* ??? FP regs should be initialized to NaN. */
env->cc_op = CC_OP_FLAGS;
cpu_m68k_set_ccr(env, 0);
/* TODO: We should set PC from the interrupt vector. */
env->pc = 0;
tlb_flush(s, 1);

46
target-m68k/cpu.h
View File

@ -75,9 +75,11 @@ typedef struct CPUM68KState {
/* Condition flags. */
uint32_t cc_op;
uint32_t cc_dest;
uint32_t cc_src;
uint32_t cc_x;
uint32_t cc_x; /* always 0/1 */
uint32_t cc_n; /* in bit 31 (i.e. negative) */
uint32_t cc_v; /* in bit 31, unused, or computed from cc_n and cc_v */
uint32_t cc_c; /* either 0/1, unused, or computed from cc_n and cc_v */
uint32_t cc_z; /* == 0 or unused */
float64 fregs[8];
float64 fp_result;
@ -170,27 +172,23 @@ void cpu_m68k_set_ccr(CPUM68KState *env, uint32_t);
* are only needed for conditional branches.
*/
typedef enum {
CC_OP_DYNAMIC, /* Use env->cc_op */
CC_OP_FLAGS, /* CC_DEST = CVZN, CC_SRC = unused */
CC_OP_LOGICB, /* CC_DEST = result, CC_SRC = unused */
CC_OP_LOGICW, /* CC_DEST = result, CC_SRC = unused */
CC_OP_LOGIC, /* CC_DEST = result, CC_SRC = unused */
CC_OP_ADDB, /* CC_DEST = result, CC_SRC = source */
CC_OP_ADDW, /* CC_DEST = result, CC_SRC = source */
CC_OP_ADD, /* CC_DEST = result, CC_SRC = source */
CC_OP_SUBB, /* CC_DEST = result, CC_SRC = source */
CC_OP_SUBW, /* CC_DEST = result, CC_SRC = source */
CC_OP_SUB, /* CC_DEST = result, CC_SRC = source */
CC_OP_ADDXB, /* CC_DEST = result, CC_SRC = source */
CC_OP_ADDXW, /* CC_DEST = result, CC_SRC = source */
CC_OP_ADDX, /* CC_DEST = result, CC_SRC = source */
CC_OP_SUBXB, /* CC_DEST = result, CC_SRC = source */
CC_OP_SUBXW, /* CC_DEST = result, CC_SRC = source */
CC_OP_SUBX, /* CC_DEST = result, CC_SRC = source */
CC_OP_SHIFTB, /* CC_DEST = result, CC_SRC = carry */
CC_OP_SHIFTW, /* CC_DEST = result, CC_SRC = carry */
CC_OP_SHIFT, /* CC_DEST = result, CC_SRC = carry */
CC_OP_NB,
/* Translator only -- use env->cc_op. */
CC_OP_DYNAMIC = -1,
/* Each flag bit computed into cc_[xcnvz]. */
CC_OP_FLAGS,
/* X in cc_x, C = X, N in cc_n, Z in cc_n, V via cc_n/cc_v. */
CC_OP_ADD,
CC_OP_SUB,
/* X in cc_x, {N,Z,C,V} via cc_n/cc_v. */
CC_OP_CMP,
/* X in cc_x, C = 0, V = 0, N in cc_n, Z in cc_n. */
CC_OP_LOGIC,
CC_OP_NB
} CCOp;
#define CCF_C 0x01

359
target-m68k/helper.c
View File

@ -132,151 +132,6 @@ void m68k_cpu_init_gdb(M68kCPU *cpu)
/* TODO: Add [E]MAC registers. */
}
static uint32_t cpu_m68k_flush_flags(CPUM68KState *env, int op)
{
int flags;
uint32_t src;
uint32_t dest;
uint32_t tmp;
#define HIGHBIT(type) (1u << (sizeof(type) * 8 - 1))
#define SET_NZ(x, type) do { \
if ((type)(x) == 0) { \
flags |= CCF_Z; \
} else if ((type)(x) < 0) { \
flags |= CCF_N; \
} \
} while (0)
#define SET_FLAGS_SUB(type, utype) do { \
SET_NZ(dest, type); \
tmp = dest + src; \
if ((utype) tmp < (utype) src) { \
flags |= CCF_C; \
} \
if (HIGHBIT(type) & (tmp ^ dest) & (tmp ^ src)) { \
flags |= CCF_V; \
} \
} while (0)
#define SET_FLAGS_ADD(type, utype) do { \
SET_NZ(dest, type); \
if ((utype) dest < (utype) src) { \
flags |= CCF_C; \
} \
tmp = dest - src; \
if (HIGHBIT(type) & (src ^ dest) & ~(tmp ^ src)) { \
flags |= CCF_V; \
} \
} while (0)
#define SET_FLAGS_ADDX(type, utype) do { \
SET_NZ(dest, type); \
if ((utype) dest <= (utype) src) { \
flags |= CCF_C; \
} \
tmp = dest - src - 1; \
if (HIGHBIT(type) & (src ^ dest) & ~(tmp ^ src)) { \
flags |= CCF_V; \
} \
} while (0)
#define SET_FLAGS_SUBX(type, utype) do { \
SET_NZ(dest, type); \
tmp = dest + src + 1; \
if ((utype) tmp <= (utype) src) { \
flags |= CCF_C; \
} \
if (HIGHBIT(type) & (tmp ^ dest) & (tmp ^ src)) { \
flags |= CCF_V; \
} \
} while (0)
#define SET_FLAGS_SHIFT(type) do { \
SET_NZ(dest, type); \
flags |= src; \
} while (0)
flags = 0;
src = env->cc_src;
dest = env->cc_dest;
switch (op) {
case CC_OP_FLAGS:
flags = dest;
break;
case CC_OP_LOGICB:
SET_NZ(dest, int8_t);
break;
case CC_OP_LOGICW:
SET_NZ(dest, int16_t);
break;
case CC_OP_LOGIC:
SET_NZ(dest, int32_t);
break;
case CC_OP_ADDB:
SET_FLAGS_ADD(int8_t, uint8_t);
break;
case CC_OP_ADDW:
SET_FLAGS_ADD(int16_t, uint16_t);
break;
case CC_OP_ADD:
SET_FLAGS_ADD(int32_t, uint32_t);
break;
case CC_OP_SUBB:
SET_FLAGS_SUB(int8_t, uint8_t);
break;
case CC_OP_SUBW:
SET_FLAGS_SUB(int16_t, uint16_t);
break;
case CC_OP_SUB:
SET_FLAGS_SUB(int32_t, uint32_t);
break;
case CC_OP_ADDXB:
SET_FLAGS_ADDX(int8_t, uint8_t);
break;
case CC_OP_ADDXW:
SET_FLAGS_ADDX(int16_t, uint16_t);
break;
case CC_OP_ADDX:
SET_FLAGS_ADDX(int32_t, uint32_t);
break;
case CC_OP_SUBXB:
SET_FLAGS_SUBX(int8_t, uint8_t);
break;
case CC_OP_SUBXW:
SET_FLAGS_SUBX(int16_t, uint16_t);
break;
case CC_OP_SUBX:
SET_FLAGS_SUBX(int32_t, uint32_t);
break;
case CC_OP_SHIFTB:
SET_FLAGS_SHIFT(int8_t);
break;
case CC_OP_SHIFTW:
SET_FLAGS_SHIFT(int16_t);
break;
case CC_OP_SHIFT:
SET_FLAGS_SHIFT(int32_t);
break;
default:
g_assert_not_reached();
}
return flags;
}
uint32_t cpu_m68k_get_ccr(CPUM68KState *env)
{
return cpu_m68k_flush_flags(env, env->cc_op) | env->cc_x * CCF_X;
}
void cpu_m68k_set_ccr(CPUM68KState *env, uint32_t val)
{
env->cc_op = CC_OP_FLAGS;
env->cc_dest = val & 0xf;
env->cc_x = (val & CCF_X ? 1 : 0);
}
void HELPER(movec)(CPUM68KState *env, uint32_t reg, uint32_t val)
{
M68kCPU *cpu = m68k_env_get_cpu(env);
@ -413,59 +268,52 @@ uint32_t HELPER(ff1)(uint32_t x)
return n;
}
uint32_t HELPER(sats)(uint32_t val, uint32_t ccr)
uint32_t HELPER(sats)(uint32_t val, uint32_t v)
{
/* The result has the opposite sign to the original value. */
if (ccr & CCF_V)
if ((int32_t)v < 0) {
val = (((int32_t)val) >> 31) ^ SIGNBIT;
}
return val;
}
uint32_t HELPER(subx_cc)(CPUM68KState *env, uint32_t op1, uint32_t op2)
{
uint32_t res;
uint32_t old_flags;
int op;
uint32_t res, new_x;
old_flags = env->cc_dest;
if (env->cc_x) {
env->cc_x = (op1 <= op2);
op = CC_OP_SUBX;
new_x = (op1 <= op2);
res = op1 - (op2 + 1);
} else {
env->cc_x = (op1 < op2);
op = CC_OP_SUB;
new_x = (op1 < op2);
res = op1 - op2;
}
env->cc_dest = res;
env->cc_src = op2;
env->cc_dest = cpu_m68k_flush_flags(env, op);
/* !Z is sticky. */
env->cc_dest &= (old_flags | ~CCF_Z);
env->cc_x = new_x;
env->cc_c = new_x;
env->cc_n = res;
env->cc_z |= res; /* !Z is sticky */
env->cc_v = (res ^ op1) & (op1 ^ op2);
return res;
}
uint32_t HELPER(addx_cc)(CPUM68KState *env, uint32_t op1, uint32_t op2)
{
uint32_t res;
uint32_t old_flags;
int op;
uint32_t res, new_x;
old_flags = env->cc_dest;
if (env->cc_x) {
res = op1 + op2 + 1;
env->cc_x = (res <= op2);
op = CC_OP_ADDX;
new_x = (res <= op2);
} else {
res = op1 + op2;
env->cc_x = (res < op2);
op = CC_OP_ADD;
new_x = (res < op2);
}
env->cc_dest = res;
env->cc_src = op2;
env->cc_dest = cpu_m68k_flush_flags(env, op);
/* !Z is sticky. */
env->cc_dest &= (old_flags | ~CCF_Z);
env->cc_x = new_x;
env->cc_c = new_x;
env->cc_n = res;
env->cc_z |= res; /* !Z is sticky. */
env->cc_v = (res ^ op1) & ~(op1 ^ op2);
return res;
}
@ -478,73 +326,53 @@ void HELPER(set_sr)(CPUM68KState *env, uint32_t val)
uint32_t HELPER(shl_cc)(CPUM68KState *env, uint32_t val, uint32_t shift)
{
uint32_t result;
uint32_t cf;
uint64_t result;
shift &= 63;
if (shift == 0) {
result = val;
cf = env->cc_src & CCF_C;
} else if (shift < 32) {
result = val << shift;
cf = (val >> (32 - shift)) & 1;
} else if (shift == 32) {
result = 0;
cf = val & 1;
} else /* shift > 32 */ {
result = 0;
cf = 0;
}
env->cc_src = cf;
env->cc_x = (cf != 0);
env->cc_dest = result;
result = (uint64_t)val << shift;
env->cc_c = (result >> 32) & 1;
env->cc_n = result;
env->cc_z = result;
env->cc_v = 0;
env->cc_x = shift ? env->cc_c : env->cc_x;
return result;
}
uint32_t HELPER(shr_cc)(CPUM68KState *env, uint32_t val, uint32_t shift)
{
uint64_t temp;
uint32_t result;
uint32_t cf;
shift &= 63;
if (shift == 0) {
result = val;
cf = env->cc_src & CCF_C;
} else if (shift < 32) {
result = val >> shift;
cf = (val >> (shift - 1)) & 1;
} else if (shift == 32) {
result = 0;
cf = val >> 31;
} else /* shift > 32 */ {
result = 0;
cf = 0;
}
env->cc_src = cf;
env->cc_x = (cf != 0);
env->cc_dest = result;
temp = (uint64_t)val << 32 >> shift;
result = temp >> 32;
env->cc_c = (temp >> 31) & 1;
env->cc_n = result;
env->cc_z = result;
env->cc_v = 0;
env->cc_x = shift ? env->cc_c : env->cc_x;
return result;
}
uint32_t HELPER(sar_cc)(CPUM68KState *env, uint32_t val, uint32_t shift)
{
uint64_t temp;
uint32_t result;
uint32_t cf;
shift &= 63;
if (shift == 0) {
result = val;
cf = (env->cc_src & CCF_C) != 0;
} else if (shift < 32) {
result = (int32_t)val >> shift;
cf = (val >> (shift - 1)) & 1;
} else /* shift >= 32 */ {
result = (int32_t)val >> 31;
cf = val >> 31;
}
env->cc_src = cf;
env->cc_x = cf;
env->cc_dest = result;
temp = (int64_t)val << 32 >> shift;
result = temp >> 32;
env->cc_c = (temp >> 31) & 1;
env->cc_n = result;
env->cc_z = result;
env->cc_v = result ^ val;
env->cc_x = shift ? env->cc_c : env->cc_x;
return result;
}
@ -796,9 +624,92 @@ void HELPER(mac_set_flags)(CPUM68KState *env, uint32_t acc)
}
}
uint32_t HELPER(flush_flags)(CPUM68KState *env, uint32_t op)
#define COMPUTE_CCR(op, x, n, z, v, c) { \
switch (op) { \
case CC_OP_FLAGS: \
/* Everything in place. */ \
break; \
case CC_OP_ADD: \
res = n; \
src2 = v; \
src1 = res - src2; \
c = x; \
z = n; \
v = (res ^ src1) & ~(src1 ^ src2); \
break; \
case CC_OP_SUB: \
res = n; \
src2 = v; \
src1 = res + src2; \
c = x; \
z = n; \
v = (res ^ src1) & (src1 ^ src2); \
break; \
case CC_OP_CMP: \
src1 = n; \
src2 = v; \
res = src1 - src2; \
n = res; \
z = res; \
c = src1 < src2; \
v = (res ^ src1) & (src1 ^ src2); \
break; \
case CC_OP_LOGIC: \
c = v = 0; \
z = n; \
break; \
default: \
cpu_abort(CPU(m68k_env_get_cpu(env)), "Bad CC_OP %d", op); \
} \
} while (0)
uint32_t cpu_m68k_get_ccr(CPUM68KState *env)
{
return cpu_m68k_flush_flags(env, op);
uint32_t x, c, n, z, v;
uint32_t res, src1, src2;
x = env->cc_x;
c = env->cc_c;
n = env->cc_n;
z = env->cc_z;
v = env->cc_v;
COMPUTE_CCR(env->cc_op, x, n, z, v, c);
n = n >> 31;
v = v >> 31;
z = (z == 0);
return x * CCF_X + n * CCF_N + z * CCF_Z + v * CCF_V + c * CCF_C;
}
uint32_t HELPER(get_ccr)(CPUM68KState *env)
{
return cpu_m68k_get_ccr(env);
}
void cpu_m68k_set_ccr(CPUM68KState *env, uint32_t ccr)
{
env->cc_x = (ccr & CCF_X ? 1 : 0);
env->cc_n = (ccr & CCF_N ? -1 : 0);
env->cc_z = (ccr & CCF_Z ? 0 : 1);
env->cc_v = (ccr & CCF_V ? -1 : 0);
env->cc_c = (ccr & CCF_C ? 1 : 0);
env->cc_op = CC_OP_FLAGS;
}
void HELPER(set_ccr)(CPUM68KState *env, uint32_t ccr)
{
cpu_m68k_set_ccr(env, ccr);
}
void HELPER(flush_flags)(CPUM68KState *env, uint32_t cc_op)
{
uint32_t res, src1, src2;
COMPUTE_CCR(cc_op, env->cc_x, env->cc_n, env->cc_z, env->cc_v, env->cc_c);
env->cc_op = CC_OP_FLAGS;
}
uint32_t HELPER(get_macf)(CPUM68KState *env, uint64_t val)

6
target-m68k/helper.h
View File

@ -1,6 +1,6 @@
DEF_HELPER_1(bitrev, i32, i32)
DEF_HELPER_1(ff1, i32, i32)
DEF_HELPER_2(sats, i32, i32, i32)
DEF_HELPER_FLAGS_2(sats, TCG_CALL_NO_RWG_SE, i32, i32, i32)
DEF_HELPER_2(divu, void, env, i32)
DEF_HELPER_2(divs, void, env, i32)
DEF_HELPER_3(addx_cc, i32, env, i32, i32)
@ -45,5 +45,7 @@ DEF_HELPER_3(set_mac_extf, void, env, i32, i32)
DEF_HELPER_3(set_mac_exts, void, env, i32, i32)
DEF_HELPER_3(set_mac_extu, void, env, i32, i32)
DEF_HELPER_2(flush_flags, i32, env, i32)
DEF_HELPER_2(flush_flags, void, env, i32)
DEF_HELPER_2(set_ccr, void, env, i32)
DEF_HELPER_FLAGS_1(get_ccr, TCG_CALL_NO_WG_SE, i32, env)
DEF_HELPER_2(raise_exception, void, env, i32)

30
target-m68k/op_helper.c
View File

@ -185,7 +185,6 @@ void HELPER(divu)(CPUM68KState *env, uint32_t word)
uint32_t den;
uint32_t quot;
uint32_t rem;
uint32_t flags;
num = env->div1;
den = env->div2;
@ -195,16 +194,14 @@ void HELPER(divu)(CPUM68KState *env, uint32_t word)
}
quot = num / den;
rem = num % den;
flags = 0;
if (word && quot > 0xffff)
flags |= CCF_V;
if (quot == 0)
flags |= CCF_Z;
else if ((int32_t)quot < 0)
flags |= CCF_N;
env->cc_v = (word && quot > 0xffff ? -1 : 0);
env->cc_z = quot;
env->cc_n = quot;
env->cc_c = 0;
env->div1 = quot;
env->div2 = rem;
env->cc_dest = flags;
}
void HELPER(divs)(CPUM68KState *env, uint32_t word)
@ -213,7 +210,6 @@ void HELPER(divs)(CPUM68KState *env, uint32_t word)
int32_t den;
int32_t quot;
int32_t rem;
int32_t flags;
num = env->div1;
den = env->div2;
@ -222,14 +218,12 @@ void HELPER(divs)(CPUM68KState *env, uint32_t word)
}
quot = num / den;
rem = num % den;
flags = 0;
if (word && quot != (int16_t)quot)
flags |= CCF_V;
if (quot == 0)
flags |= CCF_Z;
else if (quot < 0)
flags |= CCF_N;
env->cc_v = (word && quot != (int16_t)quot ? -1 : 0);
env->cc_z = quot;
env->cc_n = quot;
env->cc_c = 0;
env->div1 = quot;
env->div2 = rem;
env->cc_dest = flags;
}

6
target-m68k/qregs.def
View File

@ -2,9 +2,11 @@ DEFF64(FP_RESULT, fp_result)
DEFO32(PC, pc)
DEFO32(SR, sr)
DEFO32(CC_OP, cc_op)
DEFO32(CC_DEST, cc_dest)
DEFO32(CC_SRC, cc_src)
DEFO32(CC_X, cc_x)
DEFO32(CC_C, cc_c)
DEFO32(CC_N, cc_n)
DEFO32(CC_V, cc_v)
DEFO32(CC_Z, cc_z)
DEFO32(DIV1, div1)
DEFO32(DIV2, div2)
DEFO32(MACSR, macsr)

411
target-m68k/translate.c
View File

@ -134,6 +134,7 @@ typedef struct DisasContext {
target_ulong pc;
int is_jmp;
CCOp cc_op; /* Current CC operation */
int cc_op_synced;
int user;
uint32_t fpcr;
struct TranslationBlock *tb;
@ -175,49 +176,44 @@ typedef void (*disas_proc)(CPUM68KState *env, DisasContext *s, uint16_t insn);
uint16_t insn)
#endif
enum {
USES_CC_DST = 1,
USES_CC_SRC = 2,
};
static const uint8_t cc_op_live[CC_OP_NB] = {
[CC_OP_DYNAMIC] = USES_CC_DST | USES_CC_SRC,
[CC_OP_FLAGS] = USES_CC_DST,
[CC_OP_LOGICB ... CC_OP_LOGIC] = USES_CC_DST,
[CC_OP_ADDB ... CC_OP_ADD] = USES_CC_DST | USES_CC_SRC,
[CC_OP_SUBB ... CC_OP_SUB] = USES_CC_DST | USES_CC_SRC,
[CC_OP_ADDXB ... CC_OP_ADDX] = USES_CC_DST | USES_CC_SRC,
[CC_OP_SUBXB ... CC_OP_SUBX] = USES_CC_DST | USES_CC_SRC,
[CC_OP_SHIFTB ... CC_OP_SHIFT] = USES_CC_DST | USES_CC_SRC,
[CC_OP_FLAGS] = CCF_C | CCF_V | CCF_Z | CCF_N | CCF_X,
[CC_OP_ADD] = CCF_X | CCF_N | CCF_V,
[CC_OP_SUB] = CCF_X | CCF_N | CCF_V,
[CC_OP_CMP] = CCF_X | CCF_N | CCF_V,
[CC_OP_LOGIC] = CCF_X | CCF_N
};
static void set_cc_op(DisasContext *s, CCOp op)
{
CCOp old_op = s->cc_op;
int dead;
if (s->cc_op == op) {
if (old_op == op) {
return;
}
/* Discard CC computation that will no longer be used. */
dead = cc_op_live[s->cc_op] & ~cc_op_live[op];
if (dead & USES_CC_DST) {
tcg_gen_discard_i32(QREG_CC_DEST);
}
if (dead & USES_CC_SRC) {
tcg_gen_discard_i32(QREG_CC_SRC);
}
if (s->cc_op == CC_OP_DYNAMIC) {
tcg_gen_discard_i32(QREG_CC_OP);
}
s->cc_op = op;
s->cc_op_synced = 0;
/* Discard CC computation that will no longer be used.
Note that X and N are never dead. */
dead = cc_op_live[old_op] & ~cc_op_live[op];
if (dead & CCF_C) {
tcg_gen_discard_i32(QREG_CC_C);
}
if (dead & CCF_Z) {
tcg_gen_discard_i32(QREG_CC_Z);
}
if (dead & CCF_V) {
tcg_gen_discard_i32(QREG_CC_V);
}
}
/* Update the CPU env CC_OP state. */
static inline void update_cc_op(DisasContext *s)
static void update_cc_op(DisasContext *s)
{
if (s->cc_op != CC_OP_DYNAMIC) {
if (!s->cc_op_synced) {
s->cc_op_synced = 1;
tcg_gen_movi_i32(QREG_CC_OP, s->cc_op);
}
}
@ -460,41 +456,79 @@ static TCGv gen_lea_indexed(CPUM68KState *env, DisasContext *s, TCGv base)
/* Evaluate all the CC flags. */
static inline void gen_flush_flags(DisasContext *s)
static void gen_flush_flags(DisasContext *s)
{
if (s->cc_op == CC_OP_FLAGS)
TCGv tmp;
switch (s->cc_op) {
case CC_OP_FLAGS:
return;
if (s->cc_op == CC_OP_DYNAMIC) {
gen_helper_flush_flags(QREG_CC_DEST, cpu_env, QREG_CC_OP);
} else {
gen_helper_flush_flags(QREG_CC_DEST, cpu_env, tcg_const_i32(s->cc_op));
case CC_OP_DYNAMIC:
gen_helper_flush_flags(cpu_env, QREG_CC_OP);
break;
default:
tmp = tcg_const_i32(s->cc_op);
gen_helper_flush_flags(cpu_env, tmp);
tcg_temp_free(tmp);
break;
}
set_cc_op(s, CC_OP_FLAGS);
/* Note that flush_flags also assigned to env->cc_op. */
s->cc_op = CC_OP_FLAGS;
s->cc_op_synced = 1;
}
#define SET_CC_OP(opsize, op) do { \
switch (opsize) { \
case OS_BYTE: \
set_cc_op(s, CC_OP_##op##B); break; \
case OS_WORD: \
set_cc_op(s, CC_OP_##op##W); break; \
case OS_LONG: \
set_cc_op(s, CC_OP_##op); break; \
default: \
abort(); \
} \
} while (0)
/* Sign or zero extend a value. */
static inline void gen_ext(TCGv res, TCGv val, int opsize, int sign)
{
switch (opsize) {
case OS_BYTE:
if (sign) {
tcg_gen_ext8s_i32(res, val);
} else {
tcg_gen_ext8u_i32(res, val);
}
break;
case OS_WORD:
if (sign) {
tcg_gen_ext16s_i32(res, val);
} else {
tcg_gen_ext16u_i32(res, val);
}
break;
case OS_LONG:
tcg_gen_mov_i32(res, val);
break;
default:
g_assert_not_reached();
}
}
static TCGv gen_extend(TCGv val, int opsize, int sign)
{
TCGv tmp;
if (opsize == OS_LONG) {
tmp = val;
} else {
tmp = tcg_temp_new();
gen_ext(tmp, val, opsize, sign);
}
return tmp;
}
static void gen_logic_cc(DisasContext *s, TCGv val, int opsize)
{
tcg_gen_mov_i32(QREG_CC_DEST, val);
SET_CC_OP(opsize, LOGIC);
gen_ext(QREG_CC_N, val, opsize, 1);
set_cc_op(s, CC_OP_LOGIC);
}
static void gen_update_cc_add(TCGv dest, TCGv src)
{
tcg_gen_mov_i32(QREG_CC_DEST, dest);
tcg_gen_mov_i32(QREG_CC_SRC, src);
tcg_gen_mov_i32(QREG_CC_N, dest);
tcg_gen_mov_i32(QREG_CC_V, src);
}
static inline int opsize_bytes(int opsize)
@ -550,36 +584,6 @@ static void gen_partset_reg(int opsize, TCGv reg, TCGv val)
}
}
/* Sign or zero extend a value. */
static inline TCGv gen_extend(TCGv val, int opsize, int sign)
{
TCGv tmp;
switch (opsize) {
case OS_BYTE:
tmp = tcg_temp_new();
if (sign)
tcg_gen_ext8s_i32(tmp, val);
else
tcg_gen_ext8u_i32(tmp, val);
break;
case OS_WORD:
tmp = tcg_temp_new();
if (sign)
tcg_gen_ext16s_i32(tmp, val);
else
tcg_gen_ext16u_i32(tmp, val);
break;
case OS_LONG:
case OS_SINGLE:
tmp = val;
break;
default:
g_assert_not_reached();
}
return tmp;
}
/* 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,
@ -758,7 +762,8 @@ static TCGv gen_ea(CPUM68KState *env, DisasContext *s, uint16_t insn,
/* This generates a conditional branch, clobbering all temporaries. */
static void gen_jmpcc(DisasContext *s, int cond, TCGLabel *l1)
{
TCGv tmp;
TCGv tmp, tmp2;
TCGCond tcond;
/* TODO: Optimize compare/branch pairs rather than always flushing
flag state to CC_OP_FLAGS. */
@ -767,97 +772,57 @@ static void gen_jmpcc(DisasContext *s, int cond, TCGLabel *l1)
switch (cond) {
case 0: /* T */
tcg_gen_br(l1);
break;
return;
case 1: /* F */
break;
case 2: /* HI (!C && !Z) */
tmp = tcg_temp_new();
tcg_gen_andi_i32(tmp, QREG_CC_DEST, CCF_C | CCF_Z);
tcg_gen_brcondi_i32(TCG_COND_EQ, tmp, 0, l1);
break;
return;
case 2: /* HI (!C && !Z) -> !(C || Z)*/
case 3: /* LS (C || Z) */
tmp = tcg_temp_new();
tcg_gen_andi_i32(tmp, QREG_CC_DEST, CCF_C | CCF_Z);
tcg_gen_brcondi_i32(TCG_COND_NE, tmp, 0, l1);
tcg_gen_setcondi_i32(TCG_COND_EQ, tmp, QREG_CC_Z, 0);
tcg_gen_or_i32(tmp, tmp, QREG_CC_C);
tcond = (cond & 1 ? TCG_COND_NE : TCG_COND_EQ);
break;
case 4: /* CC (!C) */
tmp = tcg_temp_new();
tcg_gen_andi_i32(tmp, QREG_CC_DEST, CCF_C);
tcg_gen_brcondi_i32(TCG_COND_EQ, tmp, 0, l1);
break;
case 5: /* CS (C) */
tmp = tcg_temp_new();
tcg_gen_andi_i32(tmp, QREG_CC_DEST, CCF_C);
tcg_gen_brcondi_i32(TCG_COND_NE, tmp, 0, l1);
tmp = QREG_CC_C;
tcond = (cond & 1 ? TCG_COND_NE : TCG_COND_EQ);
break;
case 6: /* NE (!Z) */
tmp = tcg_temp_new();
tcg_gen_andi_i32(tmp, QREG_CC_DEST, CCF_Z);
tcg_gen_brcondi_i32(TCG_COND_EQ, tmp, 0, l1);
break;
case 7: /* EQ (Z) */
tmp = tcg_temp_new();
tcg_gen_andi_i32(tmp, QREG_CC_DEST, CCF_Z);
tcg_gen_brcondi_i32(TCG_COND_NE, tmp, 0, l1);
tmp = QREG_CC_Z;
tcond = (cond & 1 ? TCG_COND_EQ : TCG_COND_NE);
break;
case 8: /* VC (!V) */
tmp = tcg_temp_new();
tcg_gen_andi_i32(tmp, QREG_CC_DEST, CCF_V);
tcg_gen_brcondi_i32(TCG_COND_EQ, tmp, 0, l1);
break;
case 9: /* VS (V) */
tmp = tcg_temp_new();
tcg_gen_andi_i32(tmp, QREG_CC_DEST, CCF_V);
tcg_gen_brcondi_i32(TCG_COND_NE, tmp, 0, l1);
tmp = QREG_CC_V;
tcond = (cond & 1 ? TCG_COND_LT : TCG_COND_GE);
break;
case 10: /* PL (!N) */
tmp = tcg_temp_new();
tcg_gen_andi_i32(tmp, QREG_CC_DEST, CCF_N);
tcg_gen_brcondi_i32(TCG_COND_EQ, tmp, 0, l1);
break;
case 11: /* MI (N) */
tmp = tcg_temp_new();
tcg_gen_andi_i32(tmp, QREG_CC_DEST, CCF_N);
tcg_gen_brcondi_i32(TCG_COND_NE, tmp, 0, l1);
tmp = QREG_CC_N;
tcond = (cond & 1 ? TCG_COND_LT : TCG_COND_GE);
break;
case 12: /* GE (!(N ^ V)) */
tmp = tcg_temp_new();
assert(CCF_V == (CCF_N >> 2));
tcg_gen_shri_i32(tmp, QREG_CC_DEST, 2);
tcg_gen_xor_i32(tmp, tmp, QREG_CC_DEST);
tcg_gen_andi_i32(tmp, tmp, CCF_V);
tcg_gen_brcondi_i32(TCG_COND_EQ, tmp, 0, l1);
break;
case 13: /* LT (N ^ V) */
tmp = tcg_temp_new();
assert(CCF_V == (CCF_N >> 2));
tcg_gen_shri_i32(tmp, QREG_CC_DEST, 2);
tcg_gen_xor_i32(tmp, tmp, QREG_CC_DEST);
tcg_gen_andi_i32(tmp, tmp, CCF_V);
tcg_gen_brcondi_i32(TCG_COND_NE, tmp, 0, l1);
tcg_gen_xor_i32(tmp, QREG_CC_N, QREG_CC_V);
tcond = (cond & 1 ? TCG_COND_LT : TCG_COND_GE);
break;
case 14: /* GT (!(Z || (N ^ V))) */
tmp = tcg_temp_new();
assert(CCF_V == (CCF_N >> 2));
tcg_gen_andi_i32(tmp, QREG_CC_DEST, CCF_N);
tcg_gen_shri_i32(tmp, tmp, 2);
tcg_gen_xor_i32(tmp, tmp, QREG_CC_DEST);
tcg_gen_andi_i32(tmp, tmp, CCF_V | CCF_Z);
tcg_gen_brcondi_i32(TCG_COND_EQ, tmp, 0, l1);
break;
case 15: /* LE (Z || (N ^ V)) */
tmp = tcg_temp_new();
assert(CCF_V == (CCF_N >> 2));
tcg_gen_andi_i32(tmp, QREG_CC_DEST, CCF_N);
tcg_gen_shri_i32(tmp, tmp, 2);
tcg_gen_xor_i32(tmp, tmp, QREG_CC_DEST);
tcg_gen_andi_i32(tmp, tmp, CCF_V | CCF_Z);
tcg_gen_brcondi_i32(TCG_COND_NE, tmp, 0, l1);
tcg_gen_setcondi_i32(TCG_COND_EQ, tmp, QREG_CC_Z, 0);
tcg_gen_neg_i32(tmp, tmp);
tmp2 = tcg_temp_new();
tcg_gen_xor_i32(tmp2, QREG_CC_N, QREG_CC_V);
tcg_gen_or_i32(tmp, tmp, tmp2);
tcond = (cond & 1 ? TCG_COND_LT : TCG_COND_GE);
break;
default:
/* Should ever happen. */
abort();
}
tcg_gen_brcondi_i32(tcond, tmp, 0, l1);
}
DISAS_INSN(scc)
@ -1021,6 +986,7 @@ DISAS_INSN(divw)
tcg_gen_ext16u_i32(tmp, QREG_DIV1);
tcg_gen_shli_i32(src, QREG_DIV2, 16);
tcg_gen_or_i32(reg, tmp, src);
set_cc_op(s, CC_OP_FLAGS);
}
@ -1116,42 +1082,43 @@ DISAS_INSN(bitop_reg)
else
opsize = OS_LONG;
op = (insn >> 6) & 3;
gen_flush_flags(s);
SRC_EA(env, src1, opsize, 0, op ? &addr: NULL);
src2 = DREG(insn, 9);
dest = tcg_temp_new();
gen_flush_flags(s);
tmp = tcg_temp_new();
if (opsize == OS_BYTE)
tcg_gen_andi_i32(tmp, src2, 7);
else
tcg_gen_andi_i32(tmp, src2, 31);
src2 = tmp;
tmp = tcg_temp_new();
tcg_gen_shr_i32(tmp, src1, src2);
tcg_gen_andi_i32(tmp, tmp, 1);
tcg_gen_shli_i32(tmp, tmp, 2);
/* Clear CCF_Z if bit set. */
tcg_gen_ori_i32(QREG_CC_DEST, QREG_CC_DEST, CCF_Z);
tcg_gen_xor_i32(QREG_CC_DEST, QREG_CC_DEST, tmp);
tcg_gen_shl_i32(tmp, tcg_const_i32(1), src2);
src2 = tcg_const_i32(1);
tcg_gen_shl_i32(src2, src2, tmp);
tcg_temp_free(tmp);
tcg_gen_and_i32(QREG_CC_Z, src1, src2);
switch (op) {
case 1: /* bchg */
tcg_gen_xor_i32(dest, src1, tmp);
tcg_gen_xor_i32(dest, src1, src2);
break;
case 2: /* bclr */
tcg_gen_not_i32(tmp, tmp);
tcg_gen_and_i32(dest, src1, tmp);
tcg_gen_andc_i32(dest, src1, src2);
break;
case 3: /* bset */
tcg_gen_or_i32(dest, src1, tmp);
tcg_gen_or_i32(dest, src1, src2);
break;
default: /* btst */
break;
}
if (op)
tcg_temp_free(src2);
if (op) {
DEST_EA(env, insn, opsize, dest, &addr);
}
tcg_temp_free(dest);
}
DISAS_INSN(sats)
@ -1159,7 +1126,7 @@ DISAS_INSN(sats)
TCGv reg;
reg = DREG(insn, 0);
gen_flush_flags(s);
gen_helper_sats(reg, reg, QREG_CC_DEST);
gen_helper_sats(reg, reg, QREG_CC_V);
gen_logic_cc(s, reg, OS_LONG);
}
@ -1231,28 +1198,20 @@ DISAS_INSN(bitop_im)
return;
}
gen_flush_flags(s);
SRC_EA(env, src1, opsize, 0, op ? &addr: NULL);
gen_flush_flags(s);
if (opsize == OS_BYTE)
bitnum &= 7;
else
bitnum &= 31;
mask = 1 << bitnum;
tmp = tcg_temp_new();
assert (CCF_Z == (1 << 2));
if (bitnum > 2)
tcg_gen_shri_i32(tmp, src1, bitnum - 2);
else if (bitnum < 2)
tcg_gen_shli_i32(tmp, src1, 2 - bitnum);
else
tcg_gen_mov_i32(tmp, src1);
tcg_gen_andi_i32(tmp, tmp, CCF_Z);
/* Clear CCF_Z if bit set. */
tcg_gen_ori_i32(QREG_CC_DEST, QREG_CC_DEST, CCF_Z);
tcg_gen_xor_i32(QREG_CC_DEST, QREG_CC_DEST, tmp);
tcg_gen_andi_i32(QREG_CC_Z, src1, mask);
if (op) {
tmp = tcg_temp_new();
switch (op) {
case 1: /* bchg */
tcg_gen_xori_i32(tmp, src1, mask);
@ -1267,8 +1226,10 @@ DISAS_INSN(bitop_im)
break;
}
DEST_EA(env, insn, opsize, tmp, &addr);
tcg_temp_free(tmp);
}
}
DISAS_INSN(arith_im)
{
int op;
@ -1292,7 +1253,7 @@ DISAS_INSN(arith_im)
break;
case 2: /* subi */
tcg_gen_mov_i32(dest, src1);
tcg_gen_setcond_i32(TCG_COND_LTU, QREG_CC_X, dest, tcg_const_i32(im));
tcg_gen_setcondi_i32(TCG_COND_LTU, QREG_CC_X, dest, im);
tcg_gen_subi_i32(dest, dest, im);
gen_update_cc_add(dest, tcg_const_i32(im));
set_cc_op(s, CC_OP_SUB);
@ -1301,7 +1262,7 @@ DISAS_INSN(arith_im)
tcg_gen_mov_i32(dest, src1);
tcg_gen_addi_i32(dest, dest, im);
gen_update_cc_add(dest, tcg_const_i32(im));
tcg_gen_setcond_i32(TCG_COND_LTU, QREG_CC_X, dest, tcg_const_i32(im));
tcg_gen_setcondi_i32(TCG_COND_LTU, QREG_CC_X, dest, im);
set_cc_op(s, CC_OP_ADD);
break;
case 5: /* eori */
@ -1309,10 +1270,8 @@ DISAS_INSN(arith_im)
gen_logic_cc(s, dest, OS_LONG);
break;
case 6: /* cmpi */
tcg_gen_mov_i32(dest, src1);
tcg_gen_subi_i32(dest, dest, im);
gen_update_cc_add(dest, tcg_const_i32(im));
set_cc_op(s, CC_OP_SUB);
gen_update_cc_add(src1, tcg_const_i32(im));
set_cc_op(s, CC_OP_CMP);
break;
default:
abort();
@ -1404,9 +1363,9 @@ static TCGv gen_get_ccr(DisasContext *s)
TCGv dest;
gen_flush_flags(s);
update_cc_op(s);
dest = tcg_temp_new();
tcg_gen_shli_i32(dest, QREG_CC_X, 4);
tcg_gen_or_i32(dest, dest, QREG_CC_DEST);
gen_helper_get_ccr(dest, cpu_env);
return dest;
}
@ -1428,45 +1387,47 @@ DISAS_INSN(neg)
tcg_gen_mov_i32(src1, reg);
tcg_gen_neg_i32(reg, src1);
gen_update_cc_add(reg, src1);
tcg_gen_setcond_i32(TCG_COND_LTU, QREG_CC_X, tcg_const_i32(0), src1);
tcg_gen_setcondi_i32(TCG_COND_NE, QREG_CC_X, src1, 0);
set_cc_op(s, CC_OP_SUB);
}
static void gen_set_sr_im(DisasContext *s, uint16_t val, int ccr_only)
{
tcg_gen_movi_i32(QREG_CC_DEST, val & 0xf);
tcg_gen_movi_i32(QREG_CC_X, (val & 0x10) >> 4);
if (!ccr_only) {
gen_helper_set_sr(cpu_env, tcg_const_i32(val & 0xff00));
if (ccr_only) {
tcg_gen_movi_i32(QREG_CC_C, val & CCF_C ? 1 : 0);
tcg_gen_movi_i32(QREG_CC_V, val & CCF_V ? -1 : 0);
tcg_gen_movi_i32(QREG_CC_Z, val & CCF_Z ? 0 : 1);
tcg_gen_movi_i32(QREG_CC_N, val & CCF_N ? -1 : 0);
tcg_gen_movi_i32(QREG_CC_X, val & CCF_X ? 1 : 0);
} else {
gen_helper_set_sr(cpu_env, tcg_const_i32(val));
}
set_cc_op(s, CC_OP_FLAGS);
}
static void gen_set_sr(DisasContext *s, TCGv val, int ccr_only)
static void gen_set_sr(CPUM68KState *env, DisasContext *s, uint16_t insn,
int ccr_only)
{
TCGv tmp;
tmp = tcg_temp_new();
tcg_gen_andi_i32(QREG_CC_DEST, val, 0xf);
tcg_gen_shri_i32(tmp, val, 4);
tcg_gen_andi_i32(QREG_CC_X, tmp, 1);
if (!ccr_only) {
gen_helper_set_sr(cpu_env, val);
if ((insn & 0x38) == 0) {
if (ccr_only) {
gen_helper_set_ccr(cpu_env, DREG(insn, 0));
} else {
gen_helper_set_sr(cpu_env, DREG(insn, 0));
}
set_cc_op(s, CC_OP_FLAGS);
} else if ((insn & 0x3f) == 0x3c) {
uint16_t val;
val = read_im16(env, s);
gen_set_sr_im(s, val, ccr_only);
} else {
disas_undef(env, s, insn);
}
}
static void gen_move_to_sr(CPUM68KState *env, DisasContext *s, uint16_t insn,
int ccr_only)
{
TCGv src;
s->cc_op = CC_OP_FLAGS;
SRC_EA(env, src, OS_WORD, 0, NULL);
gen_set_sr(s, src, ccr_only);
}
DISAS_INSN(move_to_ccr)
{
gen_move_to_sr(env, s, insn, 1);
gen_set_sr(env, s, insn, 1);
}
DISAS_INSN(not)
@ -1670,10 +1631,10 @@ DISAS_INSN(addsubq)
src2 = tcg_const_i32(val);
if (insn & 0x0100) {
tcg_gen_setcond_i32(TCG_COND_LTU, QREG_CC_X, dest, src2);
tcg_gen_subi_i32(dest, dest, val);
tcg_gen_sub_i32(dest, dest, src2);
set_cc_op(s, CC_OP_SUB);
} else {
tcg_gen_addi_i32(dest, dest, val);
tcg_gen_add_i32(dest, dest, src2);
tcg_gen_setcond_i32(TCG_COND_LTU, QREG_CC_X, dest, src2);
set_cc_op(s, CC_OP_ADD);
}
@ -1717,18 +1678,16 @@ DISAS_INSN(branch)
/* bsr */
gen_push(s, tcg_const_i32(s->pc));
}
update_cc_op(s);
if (op > 1) {
/* Bcc */
l1 = gen_new_label();
gen_jmpcc(s, ((insn >> 8) & 0xf) ^ 1, l1);
update_cc_op(s);
gen_jmp_tb(s, 1, base + offset);
gen_set_label(l1);
update_cc_op(s);
gen_jmp_tb(s, 0, s->pc);
} else {
/* Unconditional branch. */
update_cc_op(s);
gen_jmp_tb(s, 0, base + offset);
}
}
@ -1817,16 +1776,13 @@ DISAS_INSN(cmp)
{
TCGv src;
TCGv reg;
TCGv dest;
int opsize;
opsize = insn_opsize(insn);
SRC_EA(env, src, opsize, -1, NULL);
reg = DREG(insn, 9);
dest = tcg_temp_new();
tcg_gen_sub_i32(dest, reg, src);
gen_update_cc_add(dest, src);
SET_CC_OP(opsize, SUB);
gen_update_cc_add(reg, src);
set_cc_op(s, CC_OP_CMP);
}
DISAS_INSN(cmpa)
@ -1834,7 +1790,6 @@ DISAS_INSN(cmpa)
int opsize;
TCGv src;
TCGv reg;
TCGv dest;
if (insn & 0x100) {
opsize = OS_LONG;
@ -1843,10 +1798,8 @@ DISAS_INSN(cmpa)
}
SRC_EA(env, src, opsize, 1, NULL);
reg = AREG(insn, 9);
dest = tcg_temp_new();
tcg_gen_sub_i32(dest, reg, src);
gen_update_cc_add(dest, src);
SET_CC_OP(OS_LONG, SUB);
gen_update_cc_add(reg, src);
set_cc_op(s, CC_OP_CMP);
}
DISAS_INSN(eor)
@ -1913,6 +1866,8 @@ DISAS_INSN(shift_im)
int tmp;
TCGv shift;
set_cc_op(s, CC_OP_FLAGS);
reg = DREG(insn, 0);
tmp = (insn >> 9) & 7;
if (tmp == 0)
@ -1928,7 +1883,6 @@ DISAS_INSN(shift_im)
gen_helper_sar_cc(reg, cpu_env, reg, shift);
}
}
set_cc_op(s, CC_OP_SHIFT);
}
DISAS_INSN(shift_reg)
@ -1938,8 +1892,6 @@ DISAS_INSN(shift_reg)
reg = DREG(insn, 0);
shift = DREG(insn, 9);
/* Shift by zero leaves C flag unmodified. */
gen_flush_flags(s);
if (insn & 0x100) {
gen_helper_shl_cc(reg, cpu_env, reg, shift);
} else {
@ -1949,7 +1901,7 @@ DISAS_INSN(shift_reg)
gen_helper_sar_cc(reg, cpu_env, reg, shift);
}
}
set_cc_op(s, CC_OP_SHIFT);
set_cc_op(s, CC_OP_FLAGS);
}
DISAS_INSN(ff1)
@ -2010,7 +1962,7 @@ DISAS_INSN(move_to_sr)
gen_exception(s, s->pc - 2, EXCP_PRIVILEGE);
return;
}
gen_move_to_sr(env, s, insn, 0);
gen_set_sr(env, s, insn, 0);
gen_lookup_tb(s);
}
@ -2759,8 +2711,10 @@ DISAS_INSN(from_mext)
DISAS_INSN(macsr_to_ccr)
{
tcg_gen_movi_i32(QREG_CC_X, 0);
tcg_gen_andi_i32(QREG_CC_DEST, QREG_MACSR, 0xf);
TCGv tmp = tcg_temp_new();
tcg_gen_andi_i32(tmp, QREG_MACSR, 0xf);
gen_helper_set_sr(cpu_env, tmp);
tcg_temp_free(tmp);
set_cc_op(s, CC_OP_FLAGS);
}
@ -3044,6 +2998,7 @@ void gen_intermediate_code(CPUM68KState *env, TranslationBlock *tb)
dc->is_jmp = DISAS_NEXT;
dc->pc = pc_start;
dc->cc_op = CC_OP_DYNAMIC;
dc->cc_op_synced = 1;
dc->singlestep_enabled = cs->singlestep_enabled;
dc->fpcr = env->fpcr;
dc->user = (env->sr & SR_S) == 0;