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translate.c
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/*
* Xilinx MicroBlaze emulation for qemu: main translation routines.
*
* Copyright (c) 2009 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/>.
*/
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <inttypes.h>
#include <assert.h>
#include "cpu.h"
#include "disas.h"
#include "tcg-op.h"
#include "helper.h"
#include "microblaze-decode.h"
#include "qemu-common.h"
#define GEN_HELPER 1
#include "helper.h"
#define SIM_COMPAT 0
#define DISAS_GNU 1
#define DISAS_MB 1
#if DISAS_MB && !SIM_COMPAT
# 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 EXTRACT_FIELD(src, start, end) \
(((src) >> start) & ((1 << (end - start + 1)) - 1))
static TCGv env_debug;
static TCGv_ptr cpu_env;
static TCGv cpu_R[32];
static TCGv cpu_SR[18];
static TCGv env_imm;
static TCGv env_btaken;
static TCGv env_btarget;
static TCGv env_iflags;
#include "gen-icount.h"
/* This is the state at translation time. */
typedef struct DisasContext {
CPUState *env;
target_ulong pc;
/* Decoder. */
int type_b;
uint32_t ir;
uint8_t opcode;
uint8_t rd, ra, rb;
uint16_t imm;
unsigned int cpustate_changed;
unsigned int delayed_branch;
unsigned int tb_flags, synced_flags; /* tb dependent flags. */
unsigned int clear_imm;
int is_jmp;
#define JMP_NOJMP 0
#define JMP_DIRECT 1
#define JMP_DIRECT_CC 2
#define JMP_INDIRECT 3
unsigned int jmp;
uint32_t jmp_pc;
int abort_at_next_insn;
int nr_nops;
struct TranslationBlock *tb;
int singlestep_enabled;
} DisasContext;
static const char *regnames[] =
{
"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
"r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
"r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
"r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",
};
static const char *special_regnames[] =
{
"rpc", "rmsr", "sr2", "sr3", "sr4", "sr5", "sr6", "sr7",
"sr8", "sr9", "sr10", "sr11", "sr12", "sr13", "sr14", "sr15",
"sr16", "sr17", "sr18"
};
/* Sign extend at translation time. */
static inline int sign_extend(unsigned int val, unsigned int width)
{
int sval;
/* LSL. */
val <<= 31 - width;
sval = val;
/* ASR. */
sval >>= 31 - width;
return sval;
}
static inline void t_sync_flags(DisasContext *dc)
{
/* Synch the tb dependant flags between translator and runtime. */
if (dc->tb_flags != dc->synced_flags) {
tcg_gen_movi_tl(env_iflags, dc->tb_flags);
dc->synced_flags = dc->tb_flags;
}
}
static inline void t_gen_raise_exception(DisasContext *dc, uint32_t index)
{
TCGv_i32 tmp = tcg_const_i32(index);
t_sync_flags(dc);
tcg_gen_movi_tl(cpu_SR[SR_PC], dc->pc);
gen_helper_raise_exception(tmp);
tcg_temp_free_i32(tmp);
dc->is_jmp = DISAS_UPDATE;
}
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(cpu_SR[SR_PC], dest);
tcg_gen_exit_tb((tcg_target_long)tb + n);
} else {
tcg_gen_movi_tl(cpu_SR[SR_PC], dest);
tcg_gen_exit_tb(0);
}
}
static void read_carry(DisasContext *dc, TCGv d)
{
tcg_gen_shri_tl(d, cpu_SR[SR_MSR], 31);
}
static void write_carry(DisasContext *dc, TCGv v)
{
TCGv t0 = tcg_temp_new();
tcg_gen_shli_tl(t0, v, 31);
tcg_gen_sari_tl(t0, t0, 31);
tcg_gen_andi_tl(t0, t0, (MSR_C | MSR_CC));
tcg_gen_andi_tl(cpu_SR[SR_MSR], cpu_SR[SR_MSR],
~(MSR_C | MSR_CC));
tcg_gen_or_tl(cpu_SR[SR_MSR], cpu_SR[SR_MSR], t0);
tcg_temp_free(t0);
}
/* True if ALU operand b is a small immediate that may deserve
faster treatment. */
static inline int dec_alu_op_b_is_small_imm(DisasContext *dc)
{
/* Immediate insn without the imm prefix ? */
return dc->type_b && !(dc->tb_flags & IMM_FLAG);
}
static inline TCGv *dec_alu_op_b(DisasContext *dc)
{
if (dc->type_b) {
if (dc->tb_flags & IMM_FLAG)
tcg_gen_ori_tl(env_imm, env_imm, dc->imm);
else
tcg_gen_movi_tl(env_imm, (int32_t)((int16_t)dc->imm));
return &env_imm;
} else
return &cpu_R[dc->rb];
}
static void dec_add(DisasContext *dc)
{
unsigned int k, c;
TCGv cf;
k = dc->opcode & 4;
c = dc->opcode & 2;
LOG_DIS("add%s%s%s r%d r%d r%d\n",
dc->type_b ? "i" : "", k ? "k" : "", c ? "c" : "",
dc->rd, dc->ra, dc->rb);
/* Take care of the easy cases first. */
if (k) {
/* k - keep carry, no need to update MSR. */
/* If rd == r0, it's a nop. */
if (dc->rd) {
tcg_gen_add_tl(cpu_R[dc->rd], cpu_R[dc->ra], *(dec_alu_op_b(dc)));
if (c) {
/* c - Add carry into the result. */
cf = tcg_temp_new();
read_carry(dc, cf);
tcg_gen_add_tl(cpu_R[dc->rd], cpu_R[dc->rd], cf);
tcg_temp_free(cf);
}
}
return;
}
/* From now on, we can assume k is zero. So we need to update MSR. */
/* Extract carry. */
cf = tcg_temp_new();
if (c) {
read_carry(dc, cf);
} else {
tcg_gen_movi_tl(cf, 0);
}
if (dc->rd) {
TCGv ncf = tcg_temp_new();
gen_helper_carry(ncf, cpu_R[dc->ra], *(dec_alu_op_b(dc)), cf);
tcg_gen_add_tl(cpu_R[dc->rd], cpu_R[dc->ra], *(dec_alu_op_b(dc)));
tcg_gen_add_tl(cpu_R[dc->rd], cpu_R[dc->rd], cf);
write_carry(dc, ncf);
tcg_temp_free(ncf);
} else {
gen_helper_carry(cf, cpu_R[dc->ra], *(dec_alu_op_b(dc)), cf);
write_carry(dc, cf);
}
tcg_temp_free(cf);
}
static void dec_sub(DisasContext *dc)
{
unsigned int u, cmp, k, c;
TCGv cf, na;
u = dc->imm & 2;
k = dc->opcode & 4;
c = dc->opcode & 2;
cmp = (dc->imm & 1) && (!dc->type_b) && k;
if (cmp) {
LOG_DIS("cmp%s r%d, r%d ir=%x\n", u ? "u" : "", dc->rd, dc->ra, dc->ir);
if (dc->rd) {
if (u)
gen_helper_cmpu(cpu_R[dc->rd], cpu_R[dc->ra], cpu_R[dc->rb]);
else
gen_helper_cmp(cpu_R[dc->rd], cpu_R[dc->ra], cpu_R[dc->rb]);
}
return;
}
LOG_DIS("sub%s%s r%d, r%d r%d\n",
k ? "k" : "", c ? "c" : "", dc->rd, dc->ra, dc->rb);
/* Take care of the easy cases first. */
if (k) {
/* k - keep carry, no need to update MSR. */
/* If rd == r0, it's a nop. */
if (dc->rd) {
tcg_gen_sub_tl(cpu_R[dc->rd], *(dec_alu_op_b(dc)), cpu_R[dc->ra]);
if (c) {
/* c - Add carry into the result. */
cf = tcg_temp_new();
read_carry(dc, cf);
tcg_gen_add_tl(cpu_R[dc->rd], cpu_R[dc->rd], cf);
tcg_temp_free(cf);
}
}
return;
}
/* From now on, we can assume k is zero. So we need to update MSR. */
/* Extract carry. And complement a into na. */
cf = tcg_temp_new();
na = tcg_temp_new();
if (c) {
read_carry(dc, cf);
} else {
tcg_gen_movi_tl(cf, 1);
}
/* d = b + ~a + c. carry defaults to 1. */
tcg_gen_not_tl(na, cpu_R[dc->ra]);
if (dc->rd) {
TCGv ncf = tcg_temp_new();
gen_helper_carry(ncf, na, *(dec_alu_op_b(dc)), cf);
tcg_gen_add_tl(cpu_R[dc->rd], na, *(dec_alu_op_b(dc)));
tcg_gen_add_tl(cpu_R[dc->rd], cpu_R[dc->rd], cf);
write_carry(dc, ncf);
tcg_temp_free(ncf);
} else {
gen_helper_carry(cf, na, *(dec_alu_op_b(dc)), cf);
write_carry(dc, cf);
}
tcg_temp_free(cf);
tcg_temp_free(na);
}
static void dec_pattern(DisasContext *dc)
{
unsigned int mode;
int l1;
if ((dc->tb_flags & MSR_EE_FLAG)
&& (dc->env->pvr.regs[2] & PVR2_ILL_OPCODE_EXC_MASK)
&& !((dc->env->pvr.regs[2] & PVR2_USE_PCMP_INSTR))) {
tcg_gen_movi_tl(cpu_SR[SR_ESR], ESR_EC_ILLEGAL_OP);
t_gen_raise_exception(dc, EXCP_HW_EXCP);
}
mode = dc->opcode & 3;
switch (mode) {
case 0:
/* pcmpbf. */
LOG_DIS("pcmpbf r%d r%d r%d\n", dc->rd, dc->ra, dc->rb);
if (dc->rd)
gen_helper_pcmpbf(cpu_R[dc->rd], cpu_R[dc->ra], cpu_R[dc->rb]);
break;
case 2:
LOG_DIS("pcmpeq r%d r%d r%d\n", dc->rd, dc->ra, dc->rb);
if (dc->rd) {
TCGv t0 = tcg_temp_local_new();
l1 = gen_new_label();
tcg_gen_movi_tl(t0, 1);
tcg_gen_brcond_tl(TCG_COND_EQ,
cpu_R[dc->ra], cpu_R[dc->rb], l1);
tcg_gen_movi_tl(t0, 0);
gen_set_label(l1);
tcg_gen_mov_tl(cpu_R[dc->rd], t0);
tcg_temp_free(t0);
}
break;
case 3:
LOG_DIS("pcmpne r%d r%d r%d\n", dc->rd, dc->ra, dc->rb);
l1 = gen_new_label();
if (dc->rd) {
TCGv t0 = tcg_temp_local_new();
tcg_gen_movi_tl(t0, 1);
tcg_gen_brcond_tl(TCG_COND_NE,
cpu_R[dc->ra], cpu_R[dc->rb], l1);
tcg_gen_movi_tl(t0, 0);
gen_set_label(l1);
tcg_gen_mov_tl(cpu_R[dc->rd], t0);
tcg_temp_free(t0);
}
break;
default:
cpu_abort(dc->env,
"unsupported pattern insn opcode=%x\n", dc->opcode);
break;
}
}
static void dec_and(DisasContext *dc)
{
unsigned int not;
if (!dc->type_b && (dc->imm & (1 << 10))) {
dec_pattern(dc);
return;
}
not = dc->opcode & (1 << 1);
LOG_DIS("and%s\n", not ? "n" : "");
if (!dc->rd)
return;
if (not) {
TCGv t = tcg_temp_new();
tcg_gen_not_tl(t, *(dec_alu_op_b(dc)));
tcg_gen_and_tl(cpu_R[dc->rd], cpu_R[dc->ra], t);
tcg_temp_free(t);
} else
tcg_gen_and_tl(cpu_R[dc->rd], cpu_R[dc->ra], *(dec_alu_op_b(dc)));
}
static void dec_or(DisasContext *dc)
{
if (!dc->type_b && (dc->imm & (1 << 10))) {
dec_pattern(dc);
return;
}
LOG_DIS("or r%d r%d r%d imm=%x\n", dc->rd, dc->ra, dc->rb, dc->imm);
if (dc->rd)
tcg_gen_or_tl(cpu_R[dc->rd], cpu_R[dc->ra], *(dec_alu_op_b(dc)));
}
static void dec_xor(DisasContext *dc)
{
if (!dc->type_b && (dc->imm & (1 << 10))) {
dec_pattern(dc);
return;
}
LOG_DIS("xor r%d\n", dc->rd);
if (dc->rd)
tcg_gen_xor_tl(cpu_R[dc->rd], cpu_R[dc->ra], *(dec_alu_op_b(dc)));
}
static inline void msr_read(DisasContext *dc, TCGv d)
{
tcg_gen_mov_tl(d, cpu_SR[SR_MSR]);
}
static inline void msr_write(DisasContext *dc, TCGv v)
{
TCGv t;
t = tcg_temp_new();
dc->cpustate_changed = 1;
/* PVR bit is not writable. */
tcg_gen_andi_tl(t, v, ~MSR_PVR);
tcg_gen_andi_tl(cpu_SR[SR_MSR], cpu_SR[SR_MSR], MSR_PVR);
tcg_gen_or_tl(cpu_SR[SR_MSR], cpu_SR[SR_MSR], v);
tcg_temp_free(t);
}
static void dec_msr(DisasContext *dc)
{
TCGv t0, t1;
unsigned int sr, to, rn;
int mem_index = cpu_mmu_index(dc->env);
sr = dc->imm & ((1 << 14) - 1);
to = dc->imm & (1 << 14);
dc->type_b = 1;
if (to)
dc->cpustate_changed = 1;
/* msrclr and msrset. */
if (!(dc->imm & (1 << 15))) {
unsigned int clr = dc->ir & (1 << 16);
LOG_DIS("msr%s r%d imm=%x\n", clr ? "clr" : "set",
dc->rd, dc->imm);
if (!(dc->env->pvr.regs[2] & PVR2_USE_MSR_INSTR)) {
/* nop??? */
return;
}
if ((dc->tb_flags & MSR_EE_FLAG)
&& mem_index == MMU_USER_IDX && (dc->imm != 4 && dc->imm != 0)) {
tcg_gen_movi_tl(cpu_SR[SR_ESR], ESR_EC_PRIVINSN);
t_gen_raise_exception(dc, EXCP_HW_EXCP);
return;
}
if (dc->rd)
msr_read(dc, cpu_R[dc->rd]);
t0 = tcg_temp_new();
t1 = tcg_temp_new();
msr_read(dc, t0);
tcg_gen_mov_tl(t1, *(dec_alu_op_b(dc)));
if (clr) {
tcg_gen_not_tl(t1, t1);
tcg_gen_and_tl(t0, t0, t1);
} else
tcg_gen_or_tl(t0, t0, t1);
msr_write(dc, t0);
tcg_temp_free(t0);
tcg_temp_free(t1);
tcg_gen_movi_tl(cpu_SR[SR_PC], dc->pc + 4);
dc->is_jmp = DISAS_UPDATE;
return;
}
if (to) {
if ((dc->tb_flags & MSR_EE_FLAG)
&& mem_index == MMU_USER_IDX) {
tcg_gen_movi_tl(cpu_SR[SR_ESR], ESR_EC_PRIVINSN);
t_gen_raise_exception(dc, EXCP_HW_EXCP);
return;
}
}
#if !defined(CONFIG_USER_ONLY)
/* Catch read/writes to the mmu block. */
if ((sr & ~0xff) == 0x1000) {
sr &= 7;
LOG_DIS("m%ss sr%d r%d imm=%x\n", to ? "t" : "f", sr, dc->ra, dc->imm);
if (to)
gen_helper_mmu_write(tcg_const_tl(sr), cpu_R[dc->ra]);
else
gen_helper_mmu_read(cpu_R[dc->rd], tcg_const_tl(sr));
return;
}
#endif
if (to) {
LOG_DIS("m%ss sr%x r%d imm=%x\n", to ? "t" : "f", sr, dc->ra, dc->imm);
switch (sr) {
case 0:
break;
case 1:
msr_write(dc, cpu_R[dc->ra]);
break;
case 0x3:
tcg_gen_mov_tl(cpu_SR[SR_EAR], cpu_R[dc->ra]);
break;
case 0x5:
tcg_gen_mov_tl(cpu_SR[SR_ESR], cpu_R[dc->ra]);
break;
case 0x7:
tcg_gen_andi_tl(cpu_SR[SR_FSR], cpu_R[dc->ra], 31);
break;
default:
cpu_abort(dc->env, "unknown mts reg %x\n", sr);
break;
}
} else {
LOG_DIS("m%ss r%d sr%x imm=%x\n", to ? "t" : "f", dc->rd, sr, dc->imm);
switch (sr) {
case 0:
tcg_gen_movi_tl(cpu_R[dc->rd], dc->pc);
break;
case 1:
msr_read(dc, cpu_R[dc->rd]);
break;
case 0x3:
tcg_gen_mov_tl(cpu_R[dc->rd], cpu_SR[SR_EAR]);
break;
case 0x5:
tcg_gen_mov_tl(cpu_R[dc->rd], cpu_SR[SR_ESR]);
break;
case 0x7:
tcg_gen_mov_tl(cpu_R[dc->rd], cpu_SR[SR_FSR]);
break;
case 0xb:
tcg_gen_mov_tl(cpu_R[dc->rd], cpu_SR[SR_BTR]);
break;
case 0x2000:
case 0x2001:
case 0x2002:
case 0x2003:
case 0x2004:
case 0x2005:
case 0x2006:
case 0x2007:
case 0x2008:
case 0x2009:
case 0x200a:
case 0x200b:
case 0x200c:
rn = sr & 0xf;
tcg_gen_ld_tl(cpu_R[dc->rd],
cpu_env, offsetof(CPUState, pvr.regs[rn]));
break;
default:
cpu_abort(dc->env, "unknown mfs reg %x\n", sr);
break;
}
}
if (dc->rd == 0) {
tcg_gen_movi_tl(cpu_R[0], 0);
}
}
/* 64-bit signed mul, lower result in d and upper in d2. */
static void t_gen_muls(TCGv d, TCGv d2, TCGv a, TCGv b)
{
TCGv_i64 t0, t1;
t0 = tcg_temp_new_i64();
t1 = tcg_temp_new_i64();
tcg_gen_ext_i32_i64(t0, a);
tcg_gen_ext_i32_i64(t1, b);
tcg_gen_mul_i64(t0, t0, t1);
tcg_gen_trunc_i64_i32(d, t0);
tcg_gen_shri_i64(t0, t0, 32);
tcg_gen_trunc_i64_i32(d2, t0);
tcg_temp_free_i64(t0);
tcg_temp_free_i64(t1);
}
/* 64-bit unsigned muls, lower result in d and upper in d2. */
static void t_gen_mulu(TCGv d, TCGv d2, TCGv a, TCGv b)
{
TCGv_i64 t0, t1;
t0 = tcg_temp_new_i64();
t1 = tcg_temp_new_i64();
tcg_gen_extu_i32_i64(t0, a);
tcg_gen_extu_i32_i64(t1, b);
tcg_gen_mul_i64(t0, t0, t1);
tcg_gen_trunc_i64_i32(d, t0);
tcg_gen_shri_i64(t0, t0, 32);
tcg_gen_trunc_i64_i32(d2, t0);
tcg_temp_free_i64(t0);
tcg_temp_free_i64(t1);
}
/* Multiplier unit. */
static void dec_mul(DisasContext *dc)
{
TCGv d[2];
unsigned int subcode;
if ((dc->tb_flags & MSR_EE_FLAG)
&& (dc->env->pvr.regs[2] & PVR2_ILL_OPCODE_EXC_MASK)
&& !(dc->env->pvr.regs[0] & PVR0_USE_HW_MUL_MASK)) {
tcg_gen_movi_tl(cpu_SR[SR_ESR], ESR_EC_ILLEGAL_OP);
t_gen_raise_exception(dc, EXCP_HW_EXCP);
return;
}
subcode = dc->imm & 3;
d[0] = tcg_temp_new();
d[1] = tcg_temp_new();
if (dc->type_b) {
LOG_DIS("muli r%d r%d %x\n", dc->rd, dc->ra, dc->imm);
t_gen_mulu(cpu_R[dc->rd], d[1], cpu_R[dc->ra], *(dec_alu_op_b(dc)));
goto done;
}
/* mulh, mulhsu and mulhu are not available if C_USE_HW_MUL is < 2. */
if (subcode >= 1 && subcode <= 3
&& !((dc->env->pvr.regs[2] & PVR2_USE_MUL64_MASK))) {
/* nop??? */
}
switch (subcode) {
case 0:
LOG_DIS("mul r%d r%d r%d\n", dc->rd, dc->ra, dc->rb);
t_gen_mulu(cpu_R[dc->rd], d[1], cpu_R[dc->ra], cpu_R[dc->rb]);
break;
case 1:
LOG_DIS("mulh r%d r%d r%d\n", dc->rd, dc->ra, dc->rb);
t_gen_muls(d[0], cpu_R[dc->rd], cpu_R[dc->ra], cpu_R[dc->rb]);
break;
case 2:
LOG_DIS("mulhsu r%d r%d r%d\n", dc->rd, dc->ra, dc->rb);
t_gen_muls(d[0], cpu_R[dc->rd], cpu_R[dc->ra], cpu_R[dc->rb]);
break;
case 3:
LOG_DIS("mulhu r%d r%d r%d\n", dc->rd, dc->ra, dc->rb);
t_gen_mulu(d[0], cpu_R[dc->rd], cpu_R[dc->ra], cpu_R[dc->rb]);
break;
default:
cpu_abort(dc->env, "unknown MUL insn %x\n", subcode);
break;
}
done:
tcg_temp_free(d[0]);
tcg_temp_free(d[1]);
}
/* Div unit. */
static void dec_div(DisasContext *dc)
{
unsigned int u;
u = dc->imm & 2;
LOG_DIS("div\n");
if ((dc->env->pvr.regs[2] & PVR2_ILL_OPCODE_EXC_MASK)
&& !((dc->env->pvr.regs[0] & PVR0_USE_DIV_MASK))) {
tcg_gen_movi_tl(cpu_SR[SR_ESR], ESR_EC_ILLEGAL_OP);
t_gen_raise_exception(dc, EXCP_HW_EXCP);
}
if (u)
gen_helper_divu(cpu_R[dc->rd], *(dec_alu_op_b(dc)), cpu_R[dc->ra]);
else
gen_helper_divs(cpu_R[dc->rd], *(dec_alu_op_b(dc)), cpu_R[dc->ra]);
if (!dc->rd)
tcg_gen_movi_tl(cpu_R[dc->rd], 0);
}
static void dec_barrel(DisasContext *dc)
{
TCGv t0;
unsigned int s, t;
if ((dc->tb_flags & MSR_EE_FLAG)
&& (dc->env->pvr.regs[2] & PVR2_ILL_OPCODE_EXC_MASK)
&& !(dc->env->pvr.regs[0] & PVR0_USE_BARREL_MASK)) {
tcg_gen_movi_tl(cpu_SR[SR_ESR], ESR_EC_ILLEGAL_OP);
t_gen_raise_exception(dc, EXCP_HW_EXCP);
return;
}
s = dc->imm & (1 << 10);
t = dc->imm & (1 << 9);
LOG_DIS("bs%s%s r%d r%d r%d\n",
s ? "l" : "r", t ? "a" : "l", dc->rd, dc->ra, dc->rb);
t0 = tcg_temp_new();
tcg_gen_mov_tl(t0, *(dec_alu_op_b(dc)));
tcg_gen_andi_tl(t0, t0, 31);
if (s)
tcg_gen_shl_tl(cpu_R[dc->rd], cpu_R[dc->ra], t0);
else {
if (t)
tcg_gen_sar_tl(cpu_R[dc->rd], cpu_R[dc->ra], t0);
else
tcg_gen_shr_tl(cpu_R[dc->rd], cpu_R[dc->ra], t0);
}
}
static void dec_bit(DisasContext *dc)
{
TCGv t0, t1;
unsigned int op;
int mem_index = cpu_mmu_index(dc->env);
op = dc->ir & ((1 << 8) - 1);
switch (op) {
case 0x21:
/* src. */
t0 = tcg_temp_new();
LOG_DIS("src r%d r%d\n", dc->rd, dc->ra);
tcg_gen_andi_tl(t0, cpu_R[dc->ra], 1);
if (dc->rd) {
t1 = tcg_temp_new();
read_carry(dc, t1);
tcg_gen_shli_tl(t1, t1, 31);
tcg_gen_shri_tl(cpu_R[dc->rd], cpu_R[dc->ra], 1);
tcg_gen_or_tl(cpu_R[dc->rd], cpu_R[dc->rd], t1);
tcg_temp_free(t1);
}
/* Update carry. */
write_carry(dc, t0);
tcg_temp_free(t0);
break;
case 0x1:
case 0x41:
/* srl. */
t0 = tcg_temp_new();
LOG_DIS("srl r%d r%d\n", dc->rd, dc->ra);
/* Update carry. */
tcg_gen_andi_tl(t0, cpu_R[dc->ra], 1);
write_carry(dc, t0);
tcg_temp_free(t0);
if (dc->rd) {
if (op == 0x41)
tcg_gen_shri_tl(cpu_R[dc->rd], cpu_R[dc->ra], 1);
else
tcg_gen_sari_tl(cpu_R[dc->rd], cpu_R[dc->ra], 1);
}
break;
case 0x60:
LOG_DIS("ext8s r%d r%d\n", dc->rd, dc->ra);
tcg_gen_ext8s_i32(cpu_R[dc->rd], cpu_R[dc->ra]);
break;
case 0x61:
LOG_DIS("ext16s r%d r%d\n", dc->rd, dc->ra);
tcg_gen_ext16s_i32(cpu_R[dc->rd], cpu_R[dc->ra]);
break;
case 0x64:
case 0x66:
case 0x74:
case 0x76:
/* wdc. */
LOG_DIS("wdc r%d\n", dc->ra);
if ((dc->tb_flags & MSR_EE_FLAG)
&& mem_index == MMU_USER_IDX) {
tcg_gen_movi_tl(cpu_SR[SR_ESR], ESR_EC_PRIVINSN);
t_gen_raise_exception(dc, EXCP_HW_EXCP);
return;
}
break;
case 0x68:
/* wic. */
LOG_DIS("wic r%d\n", dc->ra);
if ((dc->tb_flags & MSR_EE_FLAG)
&& mem_index == MMU_USER_IDX) {
tcg_gen_movi_tl(cpu_SR[SR_ESR], ESR_EC_PRIVINSN);
t_gen_raise_exception(dc, EXCP_HW_EXCP);
return;
}
break;
default:
cpu_abort(dc->env, "unknown bit oc=%x op=%x rd=%d ra=%d rb=%d\n",
dc->pc, op, dc->rd, dc->ra, dc->rb);
break;
}
}
static inline void sync_jmpstate(DisasContext *dc)
{
if (dc->jmp == JMP_DIRECT || dc->jmp == JMP_DIRECT_CC) {
if (dc->jmp == JMP_DIRECT) {
tcg_gen_movi_tl(env_btaken, 1);
}
dc->jmp = JMP_INDIRECT;
tcg_gen_movi_tl(env_btarget, dc->jmp_pc);
}
}
static void dec_imm(DisasContext *dc)
{
LOG_DIS("imm %x\n", dc->imm << 16);
tcg_gen_movi_tl(env_imm, (dc->imm << 16));
dc->tb_flags |= IMM_FLAG;
dc->clear_imm = 0;
}
static inline void gen_load(DisasContext *dc, TCGv dst, TCGv addr,
unsigned int size)
{
int mem_index = cpu_mmu_index(dc->env);
if (size == 1) {
tcg_gen_qemu_ld8u(dst, addr, mem_index);
} else if (size == 2) {
tcg_gen_qemu_ld16u(dst, addr, mem_index);
} else if (size == 4) {
tcg_gen_qemu_ld32u(dst, addr, mem_index);
} else
cpu_abort(dc->env, "Incorrect load size %d\n", size);
}
static inline TCGv *compute_ldst_addr(DisasContext *dc, TCGv *t)
{
unsigned int extimm = dc->tb_flags & IMM_FLAG;
/* Treat the common cases first. */
if (!dc->type_b) {
/* If any of the regs is r0, return a ptr to the other. */
if (dc->ra == 0) {
return &cpu_R[dc->rb];
} else if (dc->rb == 0) {
return &cpu_R[dc->ra];
}
*t = tcg_temp_new();
tcg_gen_add_tl(*t, cpu_R[dc->ra], cpu_R[dc->rb]);
return t;
}
/* Immediate. */
if (!extimm) {
if (dc->imm == 0) {
return &cpu_R[dc->ra];
}
*t = tcg_temp_new();
tcg_gen_movi_tl(*t, (int32_t)((int16_t)dc->imm));
tcg_gen_add_tl(*t, cpu_R[dc->ra], *t);
} else {
*t = tcg_temp_new();
tcg_gen_add_tl(*t, cpu_R[dc->ra], *(dec_alu_op_b(dc)));
}
return t;
}
static inline void dec_byteswap(DisasContext *dc, TCGv dst, TCGv src, int size)
{
if (size == 4) {
tcg_gen_bswap32_tl(dst, src);
} else if (size == 2) {
TCGv t = tcg_temp_new();
/* bswap16 assumes the high bits are zero. */
tcg_gen_andi_tl(t, src, 0xffff);
tcg_gen_bswap16_tl(dst, t);
tcg_temp_free(t);
} else {
/* Ignore.
cpu_abort(dc->env, "Invalid ldst byteswap size %d\n", size);
*/
}
}
static void dec_load(DisasContext *dc)
{
TCGv t, *addr;
unsigned int size, rev = 0;
size = 1 << (dc->opcode & 3);
if (!dc->type_b) {
rev = (dc->ir >> 9) & 1;
}
if (size > 4 && (dc->tb_flags & MSR_EE_FLAG)
&& (dc->env->pvr.regs[2] & PVR2_ILL_OPCODE_EXC_MASK)) {
tcg_gen_movi_tl(cpu_SR[SR_ESR], ESR_EC_ILLEGAL_OP);
t_gen_raise_exception(dc, EXCP_HW_EXCP);
return;
}
LOG_DIS("l%d%s%s\n", size, dc->type_b ? "i" : "", rev ? "r" : "");
t_sync_flags(dc);
addr = compute_ldst_addr(dc, &t);
/*
* When doing reverse accesses we need to do two things.
*
* 1. Reverse the address wrt endianness.
* 2. Byteswap the data lanes on the way back into the CPU core.
*/
if (rev && size != 4) {
/* Endian reverse the address. t is addr. */
switch (size) {
case 1:
{
/* 00 -> 11
01 -> 10
10 -> 10
11 -> 00 */
TCGv low = tcg_temp_new();
/* Force addr into the temp. */
if (addr != &t) {
t = tcg_temp_new();
tcg_gen_mov_tl(t, *addr);
addr = &t;
}
tcg_gen_andi_tl(low, t, 3);
tcg_gen_sub_tl(low, tcg_const_tl(3), low);
tcg_gen_andi_tl(t, t, ~3);
tcg_gen_or_tl(t, t, low);
tcg_gen_mov_tl(env_imm, t);
tcg_temp_free(low);
break;
}
case 2:
/* 00 -> 10
10 -> 00. */
/* Force addr into the temp. */
if (addr != &t) {
t = tcg_temp_new();
tcg_gen_xori_tl(t, *addr, 2);
addr = &t;
} else {
tcg_gen_xori_tl(t, t, 2);
}
break;
default:
cpu_abort(dc->env, "Invalid reverse size\n");
break;
}
}
/* If we get a fault on a dslot, the jmpstate better be in sync. */
sync_jmpstate(dc);
/* Verify alignment if needed. */
if ((dc->env->pvr.regs[2] & PVR2_UNALIGNED_EXC_MASK) && size > 1) {
TCGv v = tcg_temp_new();
/*
* Microblaze gives MMU faults priority over faults due to
* unaligned addresses. That's why we speculatively do the load
* into v. If the load succeeds, we verify alignment of the
* address and if that succeeds we write into the destination reg.
*/
gen_load(dc, v, *addr, size);
tcg_gen_movi_tl(cpu_SR[SR_PC], dc->pc);
gen_helper_memalign(*addr, tcg_const_tl(dc->rd),
tcg_const_tl(0), tcg_const_tl(size - 1));
if (dc->rd) {
if (rev) {
dec_byteswap(dc, cpu_R[dc->rd], v, size);
} else {
tcg_gen_mov_tl(cpu_R[dc->rd], v);