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translate.c
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/*
* CRIS emulation for qemu: main translation routines.
*
* Copyright (c) 2008 AXIS Communications AB
* Written by Edgar E. Iglesias.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
/*
* FIXME:
* The condition code translation is in need of attention.
*/
#include "cpu.h"
#include "disas/disas.h"
#include "tcg-op.h"
#include "helper.h"
#include "mmu.h"
#include "crisv32-decode.h"
#define GEN_HELPER 1
#include "helper.h"
#define DISAS_CRIS 0
#if DISAS_CRIS
# define LOG_DIS(...) qemu_log_mask(CPU_LOG_TB_IN_ASM, ## __VA_ARGS__)
#else
# define LOG_DIS(...) do { } while (0)
#endif
#define D(x)
#define BUG() (gen_BUG(dc, __FILE__, __LINE__))
#define BUG_ON(x) ({if (x) BUG();})
#define DISAS_SWI 5
/* Used by the decoder. */
#define EXTRACT_FIELD(src, start, end) \
(((src) >> start) & ((1 << (end - start + 1)) - 1))
#define CC_MASK_NZ 0xc
#define CC_MASK_NZV 0xe
#define CC_MASK_NZVC 0xf
#define CC_MASK_RNZV 0x10e
static TCGv_ptr cpu_env;
static TCGv cpu_R[16];
static TCGv cpu_PR[16];
static TCGv cc_x;
static TCGv cc_src;
static TCGv cc_dest;
static TCGv cc_result;
static TCGv cc_op;
static TCGv cc_size;
static TCGv cc_mask;
static TCGv env_btaken;
static TCGv env_btarget;
static TCGv env_pc;
#include "exec/gen-icount.h"
/* This is the state at translation time. */
typedef struct DisasContext {
CPUCRISState *env;
target_ulong pc, ppc;
/* Decoder. */
unsigned int (*decoder)(CPUCRISState *env, struct DisasContext *dc);
uint32_t ir;
uint32_t opcode;
unsigned int op1;
unsigned int op2;
unsigned int zsize, zzsize;
unsigned int mode;
unsigned int postinc;
unsigned int size;
unsigned int src;
unsigned int dst;
unsigned int cond;
int update_cc;
int cc_op;
int cc_size;
uint32_t cc_mask;
int cc_size_uptodate; /* -1 invalid or last written value. */
int cc_x_uptodate; /* 1 - ccs, 2 - known | X_FLAG. 0 not uptodate. */
int flags_uptodate; /* Wether or not $ccs is uptodate. */
int flagx_known; /* Wether or not flags_x has the x flag known at
translation time. */
int flags_x;
int clear_x; /* Clear x after this insn? */
int clear_prefix; /* Clear prefix after this insn? */
int clear_locked_irq; /* Clear the irq lockout. */
int cpustate_changed;
unsigned int tb_flags; /* tb dependent flags. */
int is_jmp;
#define JMP_NOJMP 0
#define JMP_DIRECT 1
#define JMP_DIRECT_CC 2
#define JMP_INDIRECT 3
int jmp; /* 0=nojmp, 1=direct, 2=indirect. */
uint32_t jmp_pc;
int delayed_branch;
struct TranslationBlock *tb;
int singlestep_enabled;
} DisasContext;
static void gen_BUG(DisasContext *dc, const char *file, int line)
{
printf("BUG: pc=%x %s %d\n", dc->pc, file, line);
qemu_log("BUG: pc=%x %s %d\n", dc->pc, file, line);
cpu_abort(dc->env, "%s:%d\n", file, line);
}
static const char *regnames[] =
{
"$r0", "$r1", "$r2", "$r3",
"$r4", "$r5", "$r6", "$r7",
"$r8", "$r9", "$r10", "$r11",
"$r12", "$r13", "$sp", "$acr",
};
static const char *pregnames[] =
{
"$bz", "$vr", "$pid", "$srs",
"$wz", "$exs", "$eda", "$mof",
"$dz", "$ebp", "$erp", "$srp",
"$nrp", "$ccs", "$usp", "$spc",
};
/* We need this table to handle preg-moves with implicit width. */
static int preg_sizes[] = {
1, /* bz. */
1, /* vr. */
4, /* pid. */
1, /* srs. */
2, /* wz. */
4, 4, 4,
4, 4, 4, 4,
4, 4, 4, 4,
};
#define t_gen_mov_TN_env(tn, member) \
_t_gen_mov_TN_env((tn), offsetof(CPUCRISState, member))
#define t_gen_mov_env_TN(member, tn) \
_t_gen_mov_env_TN(offsetof(CPUCRISState, member), (tn))
static inline void t_gen_mov_TN_reg(TCGv tn, int r)
{
if (r < 0 || r > 15) {
fprintf(stderr, "wrong register read $r%d\n", r);
}
tcg_gen_mov_tl(tn, cpu_R[r]);
}
static inline void t_gen_mov_reg_TN(int r, TCGv tn)
{
if (r < 0 || r > 15) {
fprintf(stderr, "wrong register write $r%d\n", r);
}
tcg_gen_mov_tl(cpu_R[r], tn);
}
static inline void _t_gen_mov_TN_env(TCGv tn, int offset)
{
if (offset > sizeof(CPUCRISState)) {
fprintf(stderr, "wrong load from env from off=%d\n", offset);
}
tcg_gen_ld_tl(tn, cpu_env, offset);
}
static inline void _t_gen_mov_env_TN(int offset, TCGv tn)
{
if (offset > sizeof(CPUCRISState)) {
fprintf(stderr, "wrong store to env at off=%d\n", offset);
}
tcg_gen_st_tl(tn, cpu_env, offset);
}
static inline void t_gen_mov_TN_preg(TCGv tn, int r)
{
if (r < 0 || r > 15) {
fprintf(stderr, "wrong register read $p%d\n", r);
}
if (r == PR_BZ || r == PR_WZ || r == PR_DZ) {
tcg_gen_mov_tl(tn, tcg_const_tl(0));
} else if (r == PR_VR) {
tcg_gen_mov_tl(tn, tcg_const_tl(32));
} else {
tcg_gen_mov_tl(tn, cpu_PR[r]);
}
}
static inline void t_gen_mov_preg_TN(DisasContext *dc, int r, TCGv tn)
{
if (r < 0 || r > 15) {
fprintf(stderr, "wrong register write $p%d\n", r);
}
if (r == PR_BZ || r == PR_WZ || r == PR_DZ) {
return;
} else if (r == PR_SRS) {
tcg_gen_andi_tl(cpu_PR[r], tn, 3);
} else {
if (r == PR_PID) {
gen_helper_tlb_flush_pid(cpu_env, tn);
}
if (dc->tb_flags & S_FLAG && r == PR_SPC) {
gen_helper_spc_write(cpu_env, tn);
} else if (r == PR_CCS) {
dc->cpustate_changed = 1;
}
tcg_gen_mov_tl(cpu_PR[r], tn);
}
}
/* Sign extend at translation time. */
static int sign_extend(unsigned int val, unsigned int width)
{
int sval;
/* LSL. */
val <<= 31 - width;
sval = val;
/* ASR. */
sval >>= 31 - width;
return sval;
}
static int cris_fetch(CPUCRISState *env, DisasContext *dc, uint32_t addr,
unsigned int size, unsigned int sign)
{
int r;
switch (size) {
case 4:
{
r = cpu_ldl_code(env, addr);
break;
}
case 2:
{
if (sign) {
r = cpu_ldsw_code(env, addr);
} else {
r = cpu_lduw_code(env, addr);
}
break;
}
case 1:
{
if (sign) {
r = cpu_ldsb_code(env, addr);
} else {
r = cpu_ldub_code(env, addr);
}
break;
}
default:
cpu_abort(dc->env, "Invalid fetch size %d\n", size);
break;
}
return r;
}
static void cris_lock_irq(DisasContext *dc)
{
dc->clear_locked_irq = 0;
t_gen_mov_env_TN(locked_irq, tcg_const_tl(1));
}
static inline void t_gen_raise_exception(uint32_t index)
{
TCGv_i32 tmp = tcg_const_i32(index);
gen_helper_raise_exception(cpu_env, tmp);
tcg_temp_free_i32(tmp);
}
static void t_gen_lsl(TCGv d, TCGv a, TCGv b)
{
TCGv t0, t_31;
t0 = tcg_temp_new();
t_31 = tcg_const_tl(31);
tcg_gen_shl_tl(d, a, b);
tcg_gen_sub_tl(t0, t_31, b);
tcg_gen_sar_tl(t0, t0, t_31);
tcg_gen_and_tl(t0, t0, d);
tcg_gen_xor_tl(d, d, t0);
tcg_temp_free(t0);
tcg_temp_free(t_31);
}
static void t_gen_lsr(TCGv d, TCGv a, TCGv b)
{
TCGv t0, t_31;
t0 = tcg_temp_new();
t_31 = tcg_temp_new();
tcg_gen_shr_tl(d, a, b);
tcg_gen_movi_tl(t_31, 31);
tcg_gen_sub_tl(t0, t_31, b);
tcg_gen_sar_tl(t0, t0, t_31);
tcg_gen_and_tl(t0, t0, d);
tcg_gen_xor_tl(d, d, t0);
tcg_temp_free(t0);
tcg_temp_free(t_31);
}
static void t_gen_asr(TCGv d, TCGv a, TCGv b)
{
TCGv t0, t_31;
t0 = tcg_temp_new();
t_31 = tcg_temp_new();
tcg_gen_sar_tl(d, a, b);
tcg_gen_movi_tl(t_31, 31);
tcg_gen_sub_tl(t0, t_31, b);
tcg_gen_sar_tl(t0, t0, t_31);
tcg_gen_or_tl(d, d, t0);
tcg_temp_free(t0);
tcg_temp_free(t_31);
}
static void t_gen_cris_dstep(TCGv d, TCGv a, TCGv b)
{
int l1;
l1 = gen_new_label();
/*
* d <<= 1
* if (d >= s)
* d -= s;
*/
tcg_gen_shli_tl(d, a, 1);
tcg_gen_brcond_tl(TCG_COND_LTU, d, b, l1);
tcg_gen_sub_tl(d, d, b);
gen_set_label(l1);
}
static void t_gen_cris_mstep(TCGv d, TCGv a, TCGv b, TCGv ccs)
{
TCGv t;
/*
* d <<= 1
* if (n)
* d += s;
*/
t = tcg_temp_new();
tcg_gen_shli_tl(d, a, 1);
tcg_gen_shli_tl(t, ccs, 31 - 3);
tcg_gen_sari_tl(t, t, 31);
tcg_gen_and_tl(t, t, b);
tcg_gen_add_tl(d, d, t);
tcg_temp_free(t);
}
/* Extended arithmetics on CRIS. */
static inline void t_gen_add_flag(TCGv d, int flag)
{
TCGv c;
c = tcg_temp_new();
t_gen_mov_TN_preg(c, PR_CCS);
/* Propagate carry into d. */
tcg_gen_andi_tl(c, c, 1 << flag);
if (flag) {
tcg_gen_shri_tl(c, c, flag);
}
tcg_gen_add_tl(d, d, c);
tcg_temp_free(c);
}
static inline void t_gen_addx_carry(DisasContext *dc, TCGv d)
{
if (dc->flagx_known) {
if (dc->flags_x) {
TCGv c;
c = tcg_temp_new();
t_gen_mov_TN_preg(c, PR_CCS);
/* C flag is already at bit 0. */
tcg_gen_andi_tl(c, c, C_FLAG);
tcg_gen_add_tl(d, d, c);
tcg_temp_free(c);
}
} else {
TCGv x, c;
x = tcg_temp_new();
c = tcg_temp_new();
t_gen_mov_TN_preg(x, PR_CCS);
tcg_gen_mov_tl(c, x);
/* Propagate carry into d if X is set. Branch free. */
tcg_gen_andi_tl(c, c, C_FLAG);
tcg_gen_andi_tl(x, x, X_FLAG);
tcg_gen_shri_tl(x, x, 4);
tcg_gen_and_tl(x, x, c);
tcg_gen_add_tl(d, d, x);
tcg_temp_free(x);
tcg_temp_free(c);
}
}
static inline void t_gen_subx_carry(DisasContext *dc, TCGv d)
{
if (dc->flagx_known) {
if (dc->flags_x) {
TCGv c;
c = tcg_temp_new();
t_gen_mov_TN_preg(c, PR_CCS);
/* C flag is already at bit 0. */
tcg_gen_andi_tl(c, c, C_FLAG);
tcg_gen_sub_tl(d, d, c);
tcg_temp_free(c);
}
} else {
TCGv x, c;
x = tcg_temp_new();
c = tcg_temp_new();
t_gen_mov_TN_preg(x, PR_CCS);
tcg_gen_mov_tl(c, x);
/* Propagate carry into d if X is set. Branch free. */
tcg_gen_andi_tl(c, c, C_FLAG);
tcg_gen_andi_tl(x, x, X_FLAG);
tcg_gen_shri_tl(x, x, 4);
tcg_gen_and_tl(x, x, c);
tcg_gen_sub_tl(d, d, x);
tcg_temp_free(x);
tcg_temp_free(c);
}
}
/* Swap the two bytes within each half word of the s operand.
T0 = ((T0 << 8) & 0xff00ff00) | ((T0 >> 8) & 0x00ff00ff) */
static inline void t_gen_swapb(TCGv d, TCGv s)
{
TCGv t, org_s;
t = tcg_temp_new();
org_s = tcg_temp_new();
/* d and s may refer to the same object. */
tcg_gen_mov_tl(org_s, s);
tcg_gen_shli_tl(t, org_s, 8);
tcg_gen_andi_tl(d, t, 0xff00ff00);
tcg_gen_shri_tl(t, org_s, 8);
tcg_gen_andi_tl(t, t, 0x00ff00ff);
tcg_gen_or_tl(d, d, t);
tcg_temp_free(t);
tcg_temp_free(org_s);
}
/* Swap the halfwords of the s operand. */
static inline void t_gen_swapw(TCGv d, TCGv s)
{
TCGv t;
/* d and s refer the same object. */
t = tcg_temp_new();
tcg_gen_mov_tl(t, s);
tcg_gen_shli_tl(d, t, 16);
tcg_gen_shri_tl(t, t, 16);
tcg_gen_or_tl(d, d, t);
tcg_temp_free(t);
}
/* Reverse the within each byte.
T0 = (((T0 << 7) & 0x80808080) |
((T0 << 5) & 0x40404040) |
((T0 << 3) & 0x20202020) |
((T0 << 1) & 0x10101010) |
((T0 >> 1) & 0x08080808) |
((T0 >> 3) & 0x04040404) |
((T0 >> 5) & 0x02020202) |
((T0 >> 7) & 0x01010101));
*/
static inline void t_gen_swapr(TCGv d, TCGv s)
{
struct {
int shift; /* LSL when positive, LSR when negative. */
uint32_t mask;
} bitrev[] = {
{7, 0x80808080},
{5, 0x40404040},
{3, 0x20202020},
{1, 0x10101010},
{-1, 0x08080808},
{-3, 0x04040404},
{-5, 0x02020202},
{-7, 0x01010101}
};
int i;
TCGv t, org_s;
/* d and s refer the same object. */
t = tcg_temp_new();
org_s = tcg_temp_new();
tcg_gen_mov_tl(org_s, s);
tcg_gen_shli_tl(t, org_s, bitrev[0].shift);
tcg_gen_andi_tl(d, t, bitrev[0].mask);
for (i = 1; i < ARRAY_SIZE(bitrev); i++) {
if (bitrev[i].shift >= 0) {
tcg_gen_shli_tl(t, org_s, bitrev[i].shift);
} else {
tcg_gen_shri_tl(t, org_s, -bitrev[i].shift);
}
tcg_gen_andi_tl(t, t, bitrev[i].mask);
tcg_gen_or_tl(d, d, t);
}
tcg_temp_free(t);
tcg_temp_free(org_s);
}
static void t_gen_cc_jmp(TCGv pc_true, TCGv pc_false)
{
int l1;
l1 = gen_new_label();
/* Conditional jmp. */
tcg_gen_mov_tl(env_pc, pc_false);
tcg_gen_brcondi_tl(TCG_COND_EQ, env_btaken, 0, l1);
tcg_gen_mov_tl(env_pc, pc_true);
gen_set_label(l1);
}
static void gen_goto_tb(DisasContext *dc, int n, target_ulong dest)
{
TranslationBlock *tb;
tb = dc->tb;
if ((tb->pc & TARGET_PAGE_MASK) == (dest & TARGET_PAGE_MASK)) {
tcg_gen_goto_tb(n);
tcg_gen_movi_tl(env_pc, dest);
tcg_gen_exit_tb((uintptr_t)tb + n);
} else {
tcg_gen_movi_tl(env_pc, dest);
tcg_gen_exit_tb(0);
}
}
static inline void cris_clear_x_flag(DisasContext *dc)
{
if (dc->flagx_known && dc->flags_x) {
dc->flags_uptodate = 0;
}
dc->flagx_known = 1;
dc->flags_x = 0;
}
static void cris_flush_cc_state(DisasContext *dc)
{
if (dc->cc_size_uptodate != dc->cc_size) {
tcg_gen_movi_tl(cc_size, dc->cc_size);
dc->cc_size_uptodate = dc->cc_size;
}
tcg_gen_movi_tl(cc_op, dc->cc_op);
tcg_gen_movi_tl(cc_mask, dc->cc_mask);
}
static void cris_evaluate_flags(DisasContext *dc)
{
if (dc->flags_uptodate) {
return;
}
cris_flush_cc_state(dc);
switch (dc->cc_op) {
case CC_OP_MCP:
gen_helper_evaluate_flags_mcp(cpu_PR[PR_CCS], cpu_env,
cpu_PR[PR_CCS], cc_src,
cc_dest, cc_result);
break;
case CC_OP_MULS:
gen_helper_evaluate_flags_muls(cpu_PR[PR_CCS], cpu_env,
cpu_PR[PR_CCS], cc_result,
cpu_PR[PR_MOF]);
break;
case CC_OP_MULU:
gen_helper_evaluate_flags_mulu(cpu_PR[PR_CCS], cpu_env,
cpu_PR[PR_CCS], cc_result,
cpu_PR[PR_MOF]);
break;
case CC_OP_MOVE:
case CC_OP_AND:
case CC_OP_OR:
case CC_OP_XOR:
case CC_OP_ASR:
case CC_OP_LSR:
case CC_OP_LSL:
switch (dc->cc_size) {
case 4:
gen_helper_evaluate_flags_move_4(cpu_PR[PR_CCS],
cpu_env, cpu_PR[PR_CCS], cc_result);
break;
case 2:
gen_helper_evaluate_flags_move_2(cpu_PR[PR_CCS],
cpu_env, cpu_PR[PR_CCS], cc_result);
break;
default:
gen_helper_evaluate_flags(cpu_env);
break;
}
break;
case CC_OP_FLAGS:
/* live. */
break;
case CC_OP_SUB:
case CC_OP_CMP:
if (dc->cc_size == 4) {
gen_helper_evaluate_flags_sub_4(cpu_PR[PR_CCS], cpu_env,
cpu_PR[PR_CCS], cc_src, cc_dest, cc_result);
} else {
gen_helper_evaluate_flags(cpu_env);
}
break;
default:
switch (dc->cc_size) {
case 4:
gen_helper_evaluate_flags_alu_4(cpu_PR[PR_CCS], cpu_env,
cpu_PR[PR_CCS], cc_src, cc_dest, cc_result);
break;
default:
gen_helper_evaluate_flags(cpu_env);
break;
}
break;
}
if (dc->flagx_known) {
if (dc->flags_x) {
tcg_gen_ori_tl(cpu_PR[PR_CCS], cpu_PR[PR_CCS], X_FLAG);
} else if (dc->cc_op == CC_OP_FLAGS) {
tcg_gen_andi_tl(cpu_PR[PR_CCS], cpu_PR[PR_CCS], ~X_FLAG);
}
}
dc->flags_uptodate = 1;
}
static void cris_cc_mask(DisasContext *dc, unsigned int mask)
{
uint32_t ovl;
if (!mask) {
dc->update_cc = 0;
return;
}
/* Check if we need to evaluate the condition codes due to
CC overlaying. */
ovl = (dc->cc_mask ^ mask) & ~mask;
if (ovl) {
/* TODO: optimize this case. It trigs all the time. */
cris_evaluate_flags(dc);
}
dc->cc_mask = mask;
dc->update_cc = 1;
}
static void cris_update_cc_op(DisasContext *dc, int op, int size)
{
dc->cc_op = op;
dc->cc_size = size;
dc->flags_uptodate = 0;
}
static inline void cris_update_cc_x(DisasContext *dc)
{
/* Save the x flag state at the time of the cc snapshot. */
if (dc->flagx_known) {
if (dc->cc_x_uptodate == (2 | dc->flags_x)) {
return;
}
tcg_gen_movi_tl(cc_x, dc->flags_x);
dc->cc_x_uptodate = 2 | dc->flags_x;
} else {
tcg_gen_andi_tl(cc_x, cpu_PR[PR_CCS], X_FLAG);
dc->cc_x_uptodate = 1;
}
}
/* Update cc prior to executing ALU op. Needs source operands untouched. */
static void cris_pre_alu_update_cc(DisasContext *dc, int op,
TCGv dst, TCGv src, int size)
{
if (dc->update_cc) {
cris_update_cc_op(dc, op, size);
tcg_gen_mov_tl(cc_src, src);
if (op != CC_OP_MOVE
&& op != CC_OP_AND
&& op != CC_OP_OR
&& op != CC_OP_XOR
&& op != CC_OP_ASR
&& op != CC_OP_LSR
&& op != CC_OP_LSL) {
tcg_gen_mov_tl(cc_dest, dst);
}
cris_update_cc_x(dc);
}
}
/* Update cc after executing ALU op. needs the result. */
static inline void cris_update_result(DisasContext *dc, TCGv res)
{
if (dc->update_cc) {
tcg_gen_mov_tl(cc_result, res);
}
}
/* Returns one if the write back stage should execute. */
static void cris_alu_op_exec(DisasContext *dc, int op,
TCGv dst, TCGv a, TCGv b, int size)
{
/* Emit the ALU insns. */
switch (op) {
case CC_OP_ADD:
tcg_gen_add_tl(dst, a, b);
/* Extended arithmetics. */
t_gen_addx_carry(dc, dst);
break;
case CC_OP_ADDC:
tcg_gen_add_tl(dst, a, b);
t_gen_add_flag(dst, 0); /* C_FLAG. */
break;
case CC_OP_MCP:
tcg_gen_add_tl(dst, a, b);
t_gen_add_flag(dst, 8); /* R_FLAG. */
break;
case CC_OP_SUB:
tcg_gen_sub_tl(dst, a, b);
/* Extended arithmetics. */
t_gen_subx_carry(dc, dst);
break;
case CC_OP_MOVE:
tcg_gen_mov_tl(dst, b);
break;
case CC_OP_OR:
tcg_gen_or_tl(dst, a, b);
break;
case CC_OP_AND:
tcg_gen_and_tl(dst, a, b);
break;
case CC_OP_XOR:
tcg_gen_xor_tl(dst, a, b);
break;
case CC_OP_LSL:
t_gen_lsl(dst, a, b);
break;
case CC_OP_LSR:
t_gen_lsr(dst, a, b);
break;
case CC_OP_ASR:
t_gen_asr(dst, a, b);
break;
case CC_OP_NEG:
tcg_gen_neg_tl(dst, b);
/* Extended arithmetics. */
t_gen_subx_carry(dc, dst);
break;
case CC_OP_LZ:
gen_helper_lz(dst, b);
break;
case CC_OP_MULS:
tcg_gen_muls2_tl(dst, cpu_PR[PR_MOF], a, b);
break;
case CC_OP_MULU:
tcg_gen_mulu2_tl(dst, cpu_PR[PR_MOF], a, b);
break;
case CC_OP_DSTEP:
t_gen_cris_dstep(dst, a, b);
break;
case CC_OP_MSTEP:
t_gen_cris_mstep(dst, a, b, cpu_PR[PR_CCS]);
break;
case CC_OP_BOUND:
{
int l1;
l1 = gen_new_label();
tcg_gen_mov_tl(dst, a);
tcg_gen_brcond_tl(TCG_COND_LEU, a, b, l1);
tcg_gen_mov_tl(dst, b);
gen_set_label(l1);
}
break;
case CC_OP_CMP:
tcg_gen_sub_tl(dst, a, b);
/* Extended arithmetics. */
t_gen_subx_carry(dc, dst);
break;
default:
qemu_log("illegal ALU op.\n");
BUG();
break;
}
if (size == 1) {
tcg_gen_andi_tl(dst, dst, 0xff);
} else if (size == 2) {
tcg_gen_andi_tl(dst, dst, 0xffff);
}
}
static void cris_alu(DisasContext *dc, int op,
TCGv d, TCGv op_a, TCGv op_b, int size)
{
TCGv tmp;
int writeback;
writeback = 1;
if (op == CC_OP_CMP) {
tmp = tcg_temp_new();
writeback = 0;
} else if (size == 4) {
tmp = d;
writeback = 0;
} else {
tmp = tcg_temp_new();
}
cris_pre_alu_update_cc(dc, op, op_a, op_b, size);
cris_alu_op_exec(dc, op, tmp, op_a, op_b, size);
cris_update_result(dc, tmp);
/* Writeback. */
if (writeback) {
if (size == 1) {
tcg_gen_andi_tl(d, d, ~0xff);
} else {
tcg_gen_andi_tl(d, d, ~0xffff);
}
tcg_gen_or_tl(d, d, tmp);
}
if (!TCGV_EQUAL(tmp, d)) {
tcg_temp_free(tmp);
}
}
static int arith_cc(DisasContext *dc)
{
if (dc->update_cc) {
switch (dc->cc_op) {
case CC_OP_ADDC: return 1;
case CC_OP_ADD: return 1;
case CC_OP_SUB: return 1;
case CC_OP_DSTEP: return 1;
case CC_OP_LSL: return 1;
case CC_OP_LSR: return 1;
case CC_OP_ASR: return 1;
case CC_OP_CMP: return 1;
case CC_OP_NEG: return 1;
case CC_OP_OR: return 1;
case CC_OP_AND: return 1;
case CC_OP_XOR: return 1;
case CC_OP_MULU: return 1;
case CC_OP_MULS: return 1;
default:
return 0;
}
}
return 0;
}
static void gen_tst_cc (DisasContext *dc, TCGv cc, int cond)
{
int arith_opt, move_opt;
/* TODO: optimize more condition codes. */
/*
* If the flags are live, we've gotta look into the bits of CCS.
* Otherwise, if we just did an arithmetic operation we try to
* evaluate the condition code faster.
*
* When this function is done, T0 should be non-zero if the condition
* code is true.
*/
arith_opt = arith_cc(dc) && !dc->flags_uptodate;
move_opt = (dc->cc_op == CC_OP_MOVE);
switch (cond) {
case CC_EQ:
if ((arith_opt || move_opt)
&& dc->cc_x_uptodate != (2 | X_FLAG)) {
tcg_gen_setcond_tl(TCG_COND_EQ, cc,
cc_result, tcg_const_tl(0));
} else {
cris_evaluate_flags(dc);
tcg_gen_andi_tl(cc,
cpu_PR[PR_CCS], Z_FLAG);
}
break;
case CC_NE:
if ((arith_opt || move_opt)
&& dc->cc_x_uptodate != (2 | X_FLAG)) {
tcg_gen_mov_tl(cc, cc_result);
} else {
cris_evaluate_flags(dc);
tcg_gen_xori_tl(cc, cpu_PR[PR_CCS],
Z_FLAG);
tcg_gen_andi_tl(cc, cc, Z_FLAG);
}
break;
case CC_CS:
cris_evaluate_flags(dc);
tcg_gen_andi_tl(cc, cpu_PR[PR_CCS], C_FLAG);
break;
case CC_CC:
cris_evaluate_flags(dc);
tcg_gen_xori_tl(cc, cpu_PR[PR_CCS], C_FLAG);
tcg_gen_andi_tl(cc, cc, C_FLAG);
break;
case CC_VS:
cris_evaluate_flags(dc);
tcg_gen_andi_tl(cc, cpu_PR[PR_CCS], V_FLAG);
break;
case CC_VC:
cris_evaluate_flags(dc);
tcg_gen_xori_tl(cc, cpu_PR[PR_CCS],
V_FLAG);
tcg_gen_andi_tl(cc, cc, V_FLAG);
break;
case CC_PL:
if (arith_opt || move_opt) {
int bits = 31;
if (dc->cc_size == 1) {
bits = 7;
} else if (dc->cc_size == 2) {
bits = 15;
}
tcg_gen_shri_tl(cc, cc_result, bits);
tcg_gen_xori_tl(cc, cc, 1);
} else {
cris_evaluate_flags(dc);
tcg_gen_xori_tl(cc, cpu_PR[PR_CCS],
N_FLAG);
tcg_gen_andi_tl(cc, cc, N_FLAG);
}
break;
case CC_MI:
if (arith_opt || move_opt) {
int bits = 31;
if (dc->cc_size == 1) {
bits = 7;
} else if (dc->cc_size == 2) {
bits = 15;
}
tcg_gen_shri_tl(cc, cc_result, bits);
tcg_gen_andi_tl(cc, cc, 1);
} else {
cris_evaluate_flags(dc);
tcg_gen_andi_tl(cc, cpu_PR[PR_CCS],
N_FLAG);
}
break;
case CC_LS:
cris_evaluate_flags(dc);
tcg_gen_andi_tl(cc, cpu_PR[PR_CCS],
C_FLAG | Z_FLAG);
break;
case CC_HI:
cris_evaluate_flags(dc);
{
TCGv tmp;