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cd7dd10f09
qemu/target-mips/translate.c
bellard cd7dd10f09 MIPS CP0 not usable in kernel mode (Stefan Weil) 
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1829 c046a42c-6fe2-441c-8c8c-71466251a162
2006-04-23 15:21:24 +00:00

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/*
* MIPS32 emulation for qemu: main translation routines.
*
* Copyright (c) 2004-2005 Jocelyn Mayer
*
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <inttypes.h>
#include "cpu.h"
#include "exec-all.h"
#include "disas.h"
//#define MIPS_DEBUG_DISAS
//#define MIPS_SINGLE_STEP
#ifdef USE_DIRECT_JUMP
#define TBPARAM(x)
#else
#define TBPARAM(x) (long)(x)
#endif
enum {
#define DEF(s, n, copy_size) INDEX_op_ ## s,
#include "opc.h"
#undef DEF
NB_OPS,
};
static uint16_t *gen_opc_ptr;
static uint32_t *gen_opparam_ptr;
#include "gen-op.h"
/* MIPS opcodes */
#define EXT_SPECIAL 0x100
#define EXT_SPECIAL2 0x200
#define EXT_REGIMM 0x300
#define EXT_CP0 0x400
#define EXT_CP1 0x500
#define EXT_CP2 0x600
#define EXT_CP3 0x700
enum {
/* indirect opcode tables */
OPC_SPECIAL = 0x00,
OPC_BREGIMM = 0x01,
OPC_CP0 = 0x10,
OPC_CP1 = 0x11,
OPC_CP2 = 0x12,
OPC_CP3 = 0x13,
OPC_SPECIAL2 = 0x1C,
/* arithmetic with immediate */
OPC_ADDI = 0x08,
OPC_ADDIU = 0x09,
OPC_SLTI = 0x0A,
OPC_SLTIU = 0x0B,
OPC_ANDI = 0x0C,
OPC_ORI = 0x0D,
OPC_XORI = 0x0E,
OPC_LUI = 0x0F,
/* Jump and branches */
OPC_J = 0x02,
OPC_JAL = 0x03,
OPC_BEQ = 0x04, /* Unconditional if rs = rt = 0 (B) */
OPC_BEQL = 0x14,
OPC_BNE = 0x05,
OPC_BNEL = 0x15,
OPC_BLEZ = 0x06,
OPC_BLEZL = 0x16,
OPC_BGTZ = 0x07,
OPC_BGTZL = 0x17,
OPC_JALX = 0x1D, /* MIPS 16 only */
/* Load and stores */
OPC_LB = 0x20,
OPC_LH = 0x21,
OPC_LWL = 0x22,
OPC_LW = 0x23,
OPC_LBU = 0x24,
OPC_LHU = 0x25,
OPC_LWR = 0x26,
OPC_SB = 0x28,
OPC_SH = 0x29,
OPC_SWL = 0x2A,
OPC_SW = 0x2B,
OPC_SWR = 0x2E,
OPC_LL = 0x30,
OPC_SC = 0x38,
/* Floating point load/store */
OPC_LWC1 = 0x31,
OPC_LWC2 = 0x32,
OPC_LDC1 = 0x35,
OPC_LDC2 = 0x36,
OPC_SWC1 = 0x39,
OPC_SWC2 = 0x3A,
OPC_SDC1 = 0x3D,
OPC_SDC2 = 0x3E,
/* Cache and prefetch */
OPC_CACHE = 0x2F,
OPC_PREF = 0x33,
};
/* MIPS special opcodes */
enum {
/* Shifts */
OPC_SLL = 0x00 | EXT_SPECIAL,
/* NOP is SLL r0, r0, 0 */
/* SSNOP is SLL r0, r0, 1 */
OPC_SRL = 0x02 | EXT_SPECIAL,
OPC_SRA = 0x03 | EXT_SPECIAL,
OPC_SLLV = 0x04 | EXT_SPECIAL,
OPC_SRLV = 0x06 | EXT_SPECIAL,
OPC_SRAV = 0x07 | EXT_SPECIAL,
/* Multiplication / division */
OPC_MULT = 0x18 | EXT_SPECIAL,
OPC_MULTU = 0x19 | EXT_SPECIAL,
OPC_DIV = 0x1A | EXT_SPECIAL,
OPC_DIVU = 0x1B | EXT_SPECIAL,
/* 2 registers arithmetic / logic */
OPC_ADD = 0x20 | EXT_SPECIAL,
OPC_ADDU = 0x21 | EXT_SPECIAL,
OPC_SUB = 0x22 | EXT_SPECIAL,
OPC_SUBU = 0x23 | EXT_SPECIAL,
OPC_AND = 0x24 | EXT_SPECIAL,
OPC_OR = 0x25 | EXT_SPECIAL,
OPC_XOR = 0x26 | EXT_SPECIAL,
OPC_NOR = 0x27 | EXT_SPECIAL,
OPC_SLT = 0x2A | EXT_SPECIAL,
OPC_SLTU = 0x2B | EXT_SPECIAL,
/* Jumps */
OPC_JR = 0x08 | EXT_SPECIAL,
OPC_JALR = 0x09 | EXT_SPECIAL,
/* Traps */
OPC_TGE = 0x30 | EXT_SPECIAL,
OPC_TGEU = 0x31 | EXT_SPECIAL,
OPC_TLT = 0x32 | EXT_SPECIAL,
OPC_TLTU = 0x33 | EXT_SPECIAL,
OPC_TEQ = 0x34 | EXT_SPECIAL,
OPC_TNE = 0x36 | EXT_SPECIAL,
/* HI / LO registers load & stores */
OPC_MFHI = 0x10 | EXT_SPECIAL,
OPC_MTHI = 0x11 | EXT_SPECIAL,
OPC_MFLO = 0x12 | EXT_SPECIAL,
OPC_MTLO = 0x13 | EXT_SPECIAL,
/* Conditional moves */
OPC_MOVZ = 0x0A | EXT_SPECIAL,
OPC_MOVN = 0x0B | EXT_SPECIAL,
OPC_MOVCI = 0x01 | EXT_SPECIAL,
/* Special */
OPC_PMON = 0x05 | EXT_SPECIAL,
OPC_SYSCALL = 0x0C | EXT_SPECIAL,
OPC_BREAK = 0x0D | EXT_SPECIAL,
OPC_SYNC = 0x0F | EXT_SPECIAL,
};
enum {
/* Mutiply & xxx operations */
OPC_MADD = 0x00 | EXT_SPECIAL2,
OPC_MADDU = 0x01 | EXT_SPECIAL2,
OPC_MUL = 0x02 | EXT_SPECIAL2,
OPC_MSUB = 0x04 | EXT_SPECIAL2,
OPC_MSUBU = 0x05 | EXT_SPECIAL2,
/* Misc */
OPC_CLZ = 0x20 | EXT_SPECIAL2,
OPC_CLO = 0x21 | EXT_SPECIAL2,
/* Special */
OPC_SDBBP = 0x3F | EXT_SPECIAL2,
};
/* Branch REGIMM */
enum {
OPC_BLTZ = 0x00 | EXT_REGIMM,
OPC_BLTZL = 0x02 | EXT_REGIMM,
OPC_BGEZ = 0x01 | EXT_REGIMM,
OPC_BGEZL = 0x03 | EXT_REGIMM,
OPC_BLTZAL = 0x10 | EXT_REGIMM,
OPC_BLTZALL = 0x12 | EXT_REGIMM,
OPC_BGEZAL = 0x11 | EXT_REGIMM,
OPC_BGEZALL = 0x13 | EXT_REGIMM,
OPC_TGEI = 0x08 | EXT_REGIMM,
OPC_TGEIU = 0x09 | EXT_REGIMM,
OPC_TLTI = 0x0A | EXT_REGIMM,
OPC_TLTIU = 0x0B | EXT_REGIMM,
OPC_TEQI = 0x0C | EXT_REGIMM,
OPC_TNEI = 0x0E | EXT_REGIMM,
};
enum {
/* Coprocessor 0 (MMU) */
OPC_MFC0 = 0x00 | EXT_CP0,
OPC_MTC0 = 0x04 | EXT_CP0,
OPC_TLBR = 0x01 | EXT_CP0,
OPC_TLBWI = 0x02 | EXT_CP0,
OPC_TLBWR = 0x06 | EXT_CP0,
OPC_TLBP = 0x08 | EXT_CP0,
OPC_ERET = 0x18 | EXT_CP0,
OPC_DERET = 0x1F | EXT_CP0,
OPC_WAIT = 0x20 | EXT_CP0,
};
const unsigned char *regnames[] =
{ "r0", "at", "v0", "v1", "a0", "a1", "a2", "a3",
"t0", "t1", "t2", "t3", "t4", "t5", "t6", "t7",
"s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7",
"t8", "t9", "k0", "k1", "gp", "sp", "s8", "ra", };
/* Warning: no function for r0 register (hard wired to zero) */
#define GEN32(func, NAME) \
static GenOpFunc *NAME ## _table [32] = { \
NULL, NAME ## 1, NAME ## 2, NAME ## 3, \
NAME ## 4, NAME ## 5, NAME ## 6, NAME ## 7, \
NAME ## 8, NAME ## 9, NAME ## 10, NAME ## 11, \
NAME ## 12, NAME ## 13, NAME ## 14, NAME ## 15, \
NAME ## 16, NAME ## 17, NAME ## 18, NAME ## 19, \
NAME ## 20, NAME ## 21, NAME ## 22, NAME ## 23, \
NAME ## 24, NAME ## 25, NAME ## 26, NAME ## 27, \
NAME ## 28, NAME ## 29, NAME ## 30, NAME ## 31, \
}; \
static inline void func(int n) \
{ \
NAME ## _table[n](); \
}
/* General purpose registers moves */
GEN32(gen_op_load_gpr_T0, gen_op_load_gpr_T0_gpr);
GEN32(gen_op_load_gpr_T1, gen_op_load_gpr_T1_gpr);
GEN32(gen_op_load_gpr_T2, gen_op_load_gpr_T2_gpr);
GEN32(gen_op_store_T0_gpr, gen_op_store_T0_gpr_gpr);
GEN32(gen_op_store_T1_gpr, gen_op_store_T1_gpr_gpr);
typedef struct DisasContext {
struct TranslationBlock *tb;
target_ulong pc, saved_pc;
uint32_t opcode;
/* Routine used to access memory */
int mem_idx;
uint32_t hflags, saved_hflags;
uint32_t CP0_Status;
int bstate;
target_ulong btarget;
} DisasContext;
enum {
BS_NONE = 0, /* We go out of the TB without reaching a branch or an
* exception condition
*/
BS_STOP = 1, /* We want to stop translation for any reason */
BS_BRANCH = 2, /* We reached a branch condition */
BS_EXCP = 3, /* We reached an exception condition */
};
#if defined MIPS_DEBUG_DISAS
#define MIPS_DEBUG(fmt, args...) \
do { \
if (loglevel & CPU_LOG_TB_IN_ASM) { \
fprintf(logfile, "%08x: %08x " fmt "\n", \
ctx->pc, ctx->opcode , ##args); \
} \
} while (0)
#else
#define MIPS_DEBUG(fmt, args...) do { } while(0)
#endif
#define MIPS_INVAL(op) \
do { \
MIPS_DEBUG("Invalid %s %03x %03x %03x", op, ctx->opcode >> 26, \
ctx->opcode & 0x3F, ((ctx->opcode >> 16) & 0x1F)); \
} while (0)
#define GEN_LOAD_REG_TN(Tn, Rn) \
do { \
if (Rn == 0) { \
glue(gen_op_reset_, Tn)(); \
} else { \
glue(gen_op_load_gpr_, Tn)(Rn); \
} \
} while (0)
#define GEN_LOAD_IMM_TN(Tn, Imm) \
do { \
if (Imm == 0) { \
glue(gen_op_reset_, Tn)(); \
} else { \
glue(gen_op_set_, Tn)(Imm); \
} \
} while (0)
#define GEN_STORE_TN_REG(Rn, Tn) \
do { \
if (Rn != 0) { \
glue(glue(gen_op_store_, Tn),_gpr)(Rn); \
} \
} while (0)
static inline void save_cpu_state (DisasContext *ctx, int do_save_pc)
{
#if defined MIPS_DEBUG_DISAS
if (loglevel & CPU_LOG_TB_IN_ASM) {
fprintf(logfile, "hflags %08x saved %08x\n",
ctx->hflags, ctx->saved_hflags);
}
#endif
if (do_save_pc && ctx->pc != ctx->saved_pc) {
gen_op_save_pc(ctx->pc);
ctx->saved_pc = ctx->pc;
}
if (ctx->hflags != ctx->saved_hflags) {
gen_op_save_state(ctx->hflags);
ctx->saved_hflags = ctx->hflags;
if (ctx->hflags & MIPS_HFLAG_BR) {
gen_op_save_breg_target();
} else if (ctx->hflags & MIPS_HFLAG_B) {
gen_op_save_btarget(ctx->btarget);
} else if (ctx->hflags & MIPS_HFLAG_BMASK) {
gen_op_save_bcond();
gen_op_save_btarget(ctx->btarget);
}
}
}
static inline void generate_exception_err (DisasContext *ctx, int excp, int err)
{
#if defined MIPS_DEBUG_DISAS
if (loglevel & CPU_LOG_TB_IN_ASM)
fprintf(logfile, "%s: raise exception %d\n", __func__, excp);
#endif
save_cpu_state(ctx, 1);
if (err == 0)
gen_op_raise_exception(excp);
else
gen_op_raise_exception_err(excp, err);
ctx->bstate = BS_EXCP;
}
static inline void generate_exception (DisasContext *ctx, int excp)
{
generate_exception_err (ctx, excp, 0);
}
#if defined(CONFIG_USER_ONLY)
#define op_ldst(name) gen_op_##name##_raw()
#define OP_LD_TABLE(width)
#define OP_ST_TABLE(width)
#else
#define op_ldst(name) (*gen_op_##name[ctx->mem_idx])()
#define OP_LD_TABLE(width) \
static GenOpFunc *gen_op_l##width[] = { \
&gen_op_l##width##_user, \
&gen_op_l##width##_kernel, \
}
#define OP_ST_TABLE(width) \
static GenOpFunc *gen_op_s##width[] = { \
&gen_op_s##width##_user, \
&gen_op_s##width##_kernel, \
}
#endif
#ifdef TARGET_MIPS64
OP_LD_TABLE(d);
OP_LD_TABLE(dl);
OP_LD_TABLE(dr);
OP_ST_TABLE(d);
OP_ST_TABLE(dl);
OP_ST_TABLE(dr);
#endif
OP_LD_TABLE(w);
OP_LD_TABLE(wl);
OP_LD_TABLE(wr);
OP_ST_TABLE(w);
OP_ST_TABLE(wl);
OP_ST_TABLE(wr);
OP_LD_TABLE(h);
OP_LD_TABLE(hu);
OP_ST_TABLE(h);
OP_LD_TABLE(b);
OP_LD_TABLE(bu);
OP_ST_TABLE(b);
OP_LD_TABLE(l);
OP_ST_TABLE(c);
/* Load and store */
static void gen_ldst (DisasContext *ctx, uint16_t opc, int rt,
int base, int16_t offset)
{
const unsigned char *opn = "unk";
if (base == 0) {
GEN_LOAD_IMM_TN(T0, offset);
} else if (offset == 0) {
gen_op_load_gpr_T0(base);
} else {
gen_op_load_gpr_T0(base);
gen_op_set_T1(offset);
gen_op_add();
}
/* Don't do NOP if destination is zero: we must perform the actual
* memory access
*/
switch (opc) {
#if defined(TARGET_MIPS64)
case OPC_LD:
#if defined (MIPS_HAS_UNALIGNED_LS)
case OPC_ULD:
#endif
op_ldst(ld);
GEN_STORE_TN_REG(rt, T0);
opn = "ld";
break;
case OPC_SD:
#if defined (MIPS_HAS_UNALIGNED_LS)
case OPC_USD:
#endif
GEN_LOAD_REG_TN(T1, rt);
op_ldst(sd);
opn = "sd";
break;
case OPC_LDL:
op_ldst(ldl);
GEN_STORE_TN_REG(rt, T0);
opn = "ldl";
break;
case OPC_SDL:
GEN_LOAD_REG_TN(T1, rt);
op_ldst(sdl);
opn = "sdl";
break;
case OPC_LDR:
op_ldst(ldr);
GEN_STORE_TN_REG(rt, T0);
opn = "ldr";
break;
case OPC_SDR:
GEN_LOAD_REG_TN(T1, rt);
op_ldst(sdr);
opn = "sdr";
break;
#endif
case OPC_LW:
#if defined (MIPS_HAS_UNALIGNED_LS)
case OPC_ULW:
#endif
op_ldst(lw);
GEN_STORE_TN_REG(rt, T0);
opn = "lw";
break;
case OPC_SW:
#if defined (MIPS_HAS_UNALIGNED_LS)
case OPC_USW:
#endif
GEN_LOAD_REG_TN(T1, rt);
op_ldst(sw);
opn = "sw";
break;
case OPC_LH:
#if defined (MIPS_HAS_UNALIGNED_LS)
case OPC_ULH:
#endif
op_ldst(lh);
GEN_STORE_TN_REG(rt, T0);
opn = "lh";
break;
case OPC_SH:
#if defined (MIPS_HAS_UNALIGNED_LS)
case OPC_USH:
#endif
GEN_LOAD_REG_TN(T1, rt);
op_ldst(sh);
opn = "sh";
break;
case OPC_LHU:
#if defined (MIPS_HAS_UNALIGNED_LS)
case OPC_ULHU:
#endif
op_ldst(lhu);
GEN_STORE_TN_REG(rt, T0);
opn = "lhu";
break;
case OPC_LB:
op_ldst(lb);
GEN_STORE_TN_REG(rt, T0);
opn = "lb";
break;
case OPC_SB:
GEN_LOAD_REG_TN(T1, rt);
op_ldst(sb);
opn = "sb";
break;
case OPC_LBU:
op_ldst(lbu);
GEN_STORE_TN_REG(rt, T0);
opn = "lbu";
break;
case OPC_LWL:
GEN_LOAD_REG_TN(T1, rt);
op_ldst(lwl);
GEN_STORE_TN_REG(rt, T0);
opn = "lwl";
break;
case OPC_SWL:
GEN_LOAD_REG_TN(T1, rt);
op_ldst(swl);
opn = "swr";
break;
case OPC_LWR:
GEN_LOAD_REG_TN(T1, rt);
op_ldst(lwr);
GEN_STORE_TN_REG(rt, T0);
opn = "lwr";
break;
case OPC_SWR:
GEN_LOAD_REG_TN(T1, rt);
op_ldst(swr);
opn = "swr";
break;
case OPC_LL:
op_ldst(ll);
GEN_STORE_TN_REG(rt, T0);
opn = "ll";
break;
case OPC_SC:
GEN_LOAD_REG_TN(T1, rt);
op_ldst(sc);
GEN_STORE_TN_REG(rt, T0);
opn = "sc";
break;
default:
MIPS_INVAL("load/store");
generate_exception(ctx, EXCP_RI);
return;
}
MIPS_DEBUG("%s %s, %d(%s)", opn, regnames[rt], offset, regnames[base]);
}
/* Arithmetic with immediate operand */
static void gen_arith_imm (DisasContext *ctx, uint16_t opc, int rt,
int rs, int16_t imm)
{
uint32_t uimm;
const unsigned char *opn = "unk";
if (rt == 0 && opc != OPC_ADDI) {
/* if no destination, treat it as a NOP
* For addi, we must generate the overflow exception when needed.
*/
MIPS_DEBUG("NOP");
return;
}
if (opc == OPC_ADDI || opc == OPC_ADDIU ||
opc == OPC_SLTI || opc == OPC_SLTIU)
uimm = (int32_t)imm; /* Sign extent to 32 bits */
else
uimm = (uint16_t)imm;
if (opc != OPC_LUI) {
GEN_LOAD_REG_TN(T0, rs);
GEN_LOAD_IMM_TN(T1, uimm);
} else {
uimm = uimm << 16;
GEN_LOAD_IMM_TN(T0, uimm);
}
switch (opc) {
case OPC_ADDI:
save_cpu_state(ctx, 1);
gen_op_addo();
opn = "addi";
break;
case OPC_ADDIU:
gen_op_add();
opn = "addiu";
break;
case OPC_SLTI:
gen_op_lt();
opn = "slti";
break;
case OPC_SLTIU:
gen_op_ltu();
opn = "sltiu";
break;
case OPC_ANDI:
gen_op_and();
opn = "andi";
break;
case OPC_ORI:
gen_op_or();
opn = "ori";
break;
case OPC_XORI:
gen_op_xor();
opn = "xori";
break;
case OPC_LUI:
opn = "lui";
break;
case OPC_SLL:
gen_op_sll();
opn = "sll";
break;
case OPC_SRA:
gen_op_sra();
opn = "sra";
break;
case OPC_SRL:
gen_op_srl();
opn = "srl";
break;
default:
MIPS_INVAL("imm arith");
generate_exception(ctx, EXCP_RI);
return;
}
GEN_STORE_TN_REG(rt, T0);
MIPS_DEBUG("%s %s, %s, %x", opn, regnames[rt], regnames[rs], uimm);
}
/* Arithmetic */
static void gen_arith (DisasContext *ctx, uint16_t opc,
int rd, int rs, int rt)
{
const unsigned char *opn = "unk";
if (rd == 0 && opc != OPC_ADD && opc != OPC_SUB) {
/* if no destination, treat it as a NOP
* For add & sub, we must generate the overflow exception when needed.
*/
MIPS_DEBUG("NOP");
return;
}
GEN_LOAD_REG_TN(T0, rs);
GEN_LOAD_REG_TN(T1, rt);
switch (opc) {
case OPC_ADD:
save_cpu_state(ctx, 1);
gen_op_addo();
opn = "add";
break;
case OPC_ADDU:
gen_op_add();
opn = "addu";
break;
case OPC_SUB:
save_cpu_state(ctx, 1);
gen_op_subo();
opn = "sub";
break;
case OPC_SUBU:
gen_op_sub();
opn = "subu";
break;
case OPC_SLT:
gen_op_lt();
opn = "slt";
break;
case OPC_SLTU:
gen_op_ltu();
opn = "sltu";
break;
case OPC_AND:
gen_op_and();
opn = "and";
break;
case OPC_NOR:
gen_op_nor();
opn = "nor";
break;
case OPC_OR:
gen_op_or();
opn = "or";
break;
case OPC_XOR:
gen_op_xor();
opn = "xor";
break;
case OPC_MUL:
gen_op_mul();
opn = "mul";
break;
case OPC_MOVN:
gen_op_movn(rd);
opn = "movn";
goto print;
case OPC_MOVZ:
gen_op_movz(rd);
opn = "movz";
goto print;
case OPC_SLLV:
gen_op_sllv();
opn = "sllv";
break;
case OPC_SRAV:
gen_op_srav();
opn = "srav";
break;
case OPC_SRLV:
gen_op_srlv();
opn = "srlv";
break;
default:
MIPS_INVAL("arith");
generate_exception(ctx, EXCP_RI);
return;
}
GEN_STORE_TN_REG(rd, T0);
print:
MIPS_DEBUG("%s %s, %s, %s", opn, regnames[rd], regnames[rs], regnames[rt]);
}
/* Arithmetic on HI/LO registers */
static void gen_HILO (DisasContext *ctx, uint16_t opc, int reg)
{
const unsigned char *opn = "unk";
if (reg == 0 && (opc == OPC_MFHI || opc == OPC_MFLO)) {
/* Treat as a NOP */
MIPS_DEBUG("NOP");
return;
}
switch (opc) {
case OPC_MFHI:
gen_op_load_HI();
GEN_STORE_TN_REG(reg, T0);
opn = "mfhi";
break;
case OPC_MFLO:
gen_op_load_LO();
GEN_STORE_TN_REG(reg, T0);
opn = "mflo";
break;
case OPC_MTHI:
GEN_LOAD_REG_TN(T0, reg);
gen_op_store_HI();
opn = "mthi";
break;
case OPC_MTLO:
GEN_LOAD_REG_TN(T0, reg);
gen_op_store_LO();
opn = "mtlo";
break;
default:
MIPS_INVAL("HILO");
generate_exception(ctx, EXCP_RI);
return;
}
MIPS_DEBUG("%s %s", opn, regnames[reg]);
}
static void gen_muldiv (DisasContext *ctx, uint16_t opc,
int rs, int rt)
{
const unsigned char *opn = "unk";
GEN_LOAD_REG_TN(T0, rs);
GEN_LOAD_REG_TN(T1, rt);
switch (opc) {
case OPC_DIV:
gen_op_div();
opn = "div";
break;
case OPC_DIVU:
gen_op_divu();
opn = "divu";
break;
case OPC_MULT:
gen_op_mult();
opn = "mult";
break;
case OPC_MULTU:
gen_op_multu();
opn = "multu";
break;
case OPC_MADD:
gen_op_madd();
opn = "madd";
break;
case OPC_MADDU:
gen_op_maddu();
opn = "maddu";
break;
case OPC_MSUB:
gen_op_msub();
opn = "msub";
break;
case OPC_MSUBU:
gen_op_msubu();
opn = "msubu";
break;
default:
MIPS_INVAL("mul/div");
generate_exception(ctx, EXCP_RI);
return;
}
MIPS_DEBUG("%s %s %s", opn, regnames[rs], regnames[rt]);
}
static void gen_cl (DisasContext *ctx, uint16_t opc,
int rd, int rs)
{
const unsigned char *opn = "unk";
if (rd == 0) {
/* Treat as a NOP */
MIPS_DEBUG("NOP");
return;
}
GEN_LOAD_REG_TN(T0, rs);
switch (opc) {
case OPC_CLO:
/* CLO */
gen_op_clo();
opn = "clo";
break;
case OPC_CLZ:
/* CLZ */
gen_op_clz();
opn = "clz";
break;
default:
MIPS_INVAL("CLx");
generate_exception(ctx, EXCP_RI);
return;
}
gen_op_store_T0_gpr(rd);
MIPS_DEBUG("%s %s, %s", opn, regnames[rd], regnames[rs]);
}
/* Traps */
static void gen_trap (DisasContext *ctx, uint16_t opc,
int rs, int rt, int16_t imm)
{
int cond;
cond = 0;
/* Load needed operands */
switch (opc) {
case OPC_TEQ:
case OPC_TGE:
case OPC_TGEU:
case OPC_TLT:
case OPC_TLTU:
case OPC_TNE:
/* Compare two registers */
if (rs != rt) {
GEN_LOAD_REG_TN(T0, rs);
GEN_LOAD_REG_TN(T1, rt);
cond = 1;
}
case OPC_TEQI:
case OPC_TGEI:
case OPC_TGEIU:
case OPC_TLTI:
case OPC_TLTIU:
case OPC_TNEI:
/* Compare register to immediate */
if (rs != 0 || imm != 0) {
GEN_LOAD_REG_TN(T0, rs);
GEN_LOAD_IMM_TN(T1, (int32_t)imm);
cond = 1;
}
break;
}
if (cond == 0) {
switch (opc) {
case OPC_TEQ: /* rs == rs */
case OPC_TEQI: /* r0 == 0 */
case OPC_TGE: /* rs >= rs */
case OPC_TGEI: /* r0 >= 0 */
case OPC_TGEU: /* rs >= rs unsigned */
case OPC_TGEIU: /* r0 >= 0 unsigned */
/* Always trap */
gen_op_set_T0(1);
break;
case OPC_TLT: /* rs < rs */
case OPC_TLTI: /* r0 < 0 */
case OPC_TLTU: /* rs < rs unsigned */
case OPC_TLTIU: /* r0 < 0 unsigned */
case OPC_TNE: /* rs != rs */
case OPC_TNEI: /* r0 != 0 */
/* Never trap: treat as NOP */
return;
default:
MIPS_INVAL("TRAP");
generate_exception(ctx, EXCP_RI);
return;
}
} else {
switch (opc) {
case OPC_TEQ:
case OPC_TEQI:
gen_op_eq();
break;
case OPC_TGE:
case OPC_TGEI:
gen_op_ge();
break;
case OPC_TGEU:
case OPC_TGEIU:
gen_op_geu();
break;
case OPC_TLT:
case OPC_TLTI:
gen_op_lt();
break;
case OPC_TLTU:
case OPC_TLTIU:
gen_op_ltu();
break;
case OPC_TNE:
case OPC_TNEI:
gen_op_ne();
break;
default:
MIPS_INVAL("TRAP");
generate_exception(ctx, EXCP_RI);
return;
}
}
save_cpu_state(ctx, 1);
gen_op_trap();
ctx->bstate = BS_STOP;
}
static inline void gen_goto_tb(DisasContext *ctx, int n, target_ulong dest)
{
TranslationBlock *tb;
tb = ctx->tb;
if ((tb->pc & TARGET_PAGE_MASK) == (dest & TARGET_PAGE_MASK)) {
if (n == 0)
gen_op_goto_tb0(TBPARAM(tb));
else
gen_op_goto_tb1(TBPARAM(tb));
gen_op_save_pc(dest);
gen_op_set_T0((long)tb + n);
gen_op_exit_tb();
} else {
gen_op_save_pc(dest);
gen_op_set_T0(0);
gen_op_exit_tb();
}
}
/* Branches (before delay slot) */
static void gen_compute_branch (DisasContext *ctx, uint16_t opc,
int rs, int rt, int32_t offset)
{
target_ulong btarget;
int blink, bcond;
btarget = -1;
blink = 0;
bcond = 0;
/* Load needed operands */
switch (opc) {
case OPC_BEQ:
case OPC_BEQL:
case OPC_BNE:
case OPC_BNEL:
/* Compare two registers */
if (rs != rt) {
GEN_LOAD_REG_TN(T0, rs);
GEN_LOAD_REG_TN(T1, rt);
bcond = 1;
}
btarget = ctx->pc + 4 + offset;
break;
case OPC_BGEZ:
case OPC_BGEZAL:
case OPC_BGEZALL:
case OPC_BGEZL:
case OPC_BGTZ:
case OPC_BGTZL:
case OPC_BLEZ:
case OPC_BLEZL:
case OPC_BLTZ:
case OPC_BLTZAL:
case OPC_BLTZALL:
case OPC_BLTZL:
/* Compare to zero */
if (rs != 0) {
gen_op_load_gpr_T0(rs);
bcond = 1;
}
btarget = ctx->pc + 4 + offset;
break;
case OPC_J:
case OPC_JAL:
/* Jump to immediate */
btarget = ((ctx->pc + 4) & 0xF0000000) | offset;
break;
case OPC_JR:
case OPC_JALR:
/* Jump to register */
if (offset != 0) {
/* Only hint = 0 is valid */
generate_exception(ctx, EXCP_RI);
return;
}
GEN_LOAD_REG_TN(T2, rs);
break;
default:
MIPS_INVAL("branch/jump");
generate_exception(ctx, EXCP_RI);
return;
}
if (bcond == 0) {
/* No condition to be computed */
switch (opc) {
case OPC_BEQ: /* rx == rx */
case OPC_BEQL: /* rx == rx likely */
case OPC_BGEZ: /* 0 >= 0 */
case OPC_BGEZL: /* 0 >= 0 likely */
case OPC_BLEZ: /* 0 <= 0 */
case OPC_BLEZL: /* 0 <= 0 likely */
/* Always take */
ctx->hflags |= MIPS_HFLAG_B;
MIPS_DEBUG("balways");
break;
case OPC_BGEZAL: /* 0 >= 0 */
case OPC_BGEZALL: /* 0 >= 0 likely */
/* Always take and link */
blink = 31;
ctx->hflags |= MIPS_HFLAG_B;
MIPS_DEBUG("balways and link");
break;
case OPC_BNE: /* rx != rx */
case OPC_BGTZ: /* 0 > 0 */
case OPC_BLTZ: /* 0 < 0 */
/* Treated as NOP */
MIPS_DEBUG("bnever (NOP)");
return;
case OPC_BLTZAL: /* 0 < 0 */
gen_op_set_T0(ctx->pc + 8);
gen_op_store_T0_gpr(31);
return;
case OPC_BLTZALL: /* 0 < 0 likely */
gen_op_set_T0(ctx->pc + 8);
gen_op_store_T0_gpr(31);
gen_goto_tb(ctx, 0, ctx->pc + 4);
return;
case OPC_BNEL: /* rx != rx likely */
case OPC_BGTZL: /* 0 > 0 likely */
case OPC_BLTZL: /* 0 < 0 likely */
/* Skip the instruction in the delay slot */
MIPS_DEBUG("bnever and skip");
gen_goto_tb(ctx, 0, ctx->pc + 4);
return;
case OPC_J:
ctx->hflags |= MIPS_HFLAG_B;
MIPS_DEBUG("j %08x", btarget);
break;
case OPC_JAL:
blink = 31;
ctx->hflags |= MIPS_HFLAG_B;
MIPS_DEBUG("jal %08x", btarget);
break;
case OPC_JR:
ctx->hflags |= MIPS_HFLAG_BR;
MIPS_DEBUG("jr %s", regnames[rs]);
break;
case OPC_JALR:
blink = rt;
ctx->hflags |= MIPS_HFLAG_BR;
MIPS_DEBUG("jalr %s, %s", regnames[rt], regnames[rs]);
break;
default:
MIPS_INVAL("branch/jump");
generate_exception(ctx, EXCP_RI);
return;
}
} else {
switch (opc) {
case OPC_BEQ:
gen_op_eq();
MIPS_DEBUG("beq %s, %s, %08x",
regnames[rs], regnames[rt], btarget);
goto not_likely;
case OPC_BEQL:
gen_op_eq();
MIPS_DEBUG("beql %s, %s, %08x",
regnames[rs], regnames[rt], btarget);
goto likely;
case OPC_BNE:
gen_op_ne();
MIPS_DEBUG("bne %s, %s, %08x",
regnames[rs], regnames[rt], btarget);
goto not_likely;
case OPC_BNEL:
gen_op_ne();
MIPS_DEBUG("bnel %s, %s, %08x",
regnames[rs], regnames[rt], btarget);
goto likely;
case OPC_BGEZ:
gen_op_gez();
MIPS_DEBUG("bgez %s, %08x", regnames[rs], btarget);
goto not_likely;
case OPC_BGEZL:
gen_op_gez();
MIPS_DEBUG("bgezl %s, %08x", regnames[rs], btarget);
goto likely;
case OPC_BGEZAL:
gen_op_gez();
MIPS_DEBUG("bgezal %s, %08x", regnames[rs], btarget);
blink = 31;
goto not_likely;
case OPC_BGEZALL:
gen_op_gez();
blink = 31;
MIPS_DEBUG("bgezall %s, %08x", regnames[rs], btarget);
goto likely;
case OPC_BGTZ:
gen_op_gtz();
MIPS_DEBUG("bgtz %s, %08x", regnames[rs], btarget);
goto not_likely;
case OPC_BGTZL:
gen_op_gtz();
MIPS_DEBUG("bgtzl %s, %08x", regnames[rs], btarget);
goto likely;
case OPC_BLEZ:
gen_op_lez();
MIPS_DEBUG("blez %s, %08x", regnames[rs], btarget);
goto not_likely;
case OPC_BLEZL:
gen_op_lez();
MIPS_DEBUG("blezl %s, %08x", regnames[rs], btarget);
goto likely;
case OPC_BLTZ:
gen_op_ltz();
MIPS_DEBUG("bltz %s, %08x", regnames[rs], btarget);
goto not_likely;
case OPC_BLTZL:
gen_op_ltz();
MIPS_DEBUG("bltzl %s, %08x", regnames[rs], btarget);
goto likely;
case OPC_BLTZAL:
gen_op_ltz();
blink = 31;
MIPS_DEBUG("bltzal %s, %08x", regnames[rs], btarget);
not_likely:
ctx->hflags |= MIPS_HFLAG_BC;
break;
case OPC_BLTZALL:
gen_op_ltz();
blink = 31;
MIPS_DEBUG("bltzall %s, %08x", regnames[rs], btarget);
likely:
ctx->hflags |= MIPS_HFLAG_BL;
break;
}
gen_op_set_bcond();
}
MIPS_DEBUG("enter ds: link %d cond %02x target %08x",
blink, ctx->hflags, btarget);
ctx->btarget = btarget;
if (blink > 0) {
gen_op_set_T0(ctx->pc + 8);
gen_op_store_T0_gpr(blink);
}
return;
}
/* CP0 (MMU and control) */
static void gen_cp0 (DisasContext *ctx, uint16_t opc, int rt, int rd)
{
const unsigned char *opn = "unk";
if (!(ctx->CP0_Status & (1 << CP0St_CU0)) &&
(ctx->hflags & MIPS_HFLAG_UM) &&
!(ctx->hflags & MIPS_HFLAG_ERL) &&
!(ctx->hflags & MIPS_HFLAG_EXL)) {
if (loglevel & CPU_LOG_TB_IN_ASM) {
fprintf(logfile, "CP0 is not usable\n");
}
generate_exception_err (ctx, EXCP_CpU, 0);
return;
}
switch (opc) {
case OPC_MFC0:
if (rt == 0) {
/* Treat as NOP */
return;
}
gen_op_mfc0(rd, ctx->opcode & 0x7);
gen_op_store_T0_gpr(rt);
opn = "mfc0";
break;
case OPC_MTC0:
/* If we get an exception, we want to restart at next instruction */
ctx->pc += 4;
save_cpu_state(ctx, 1);
ctx->pc -= 4;
GEN_LOAD_REG_TN(T0, rt);
gen_op_mtc0(rd, ctx->opcode & 0x7);
/* Stop translation as we may have switched the execution mode */
ctx->bstate = BS_STOP;
opn = "mtc0";
break;
#if defined(MIPS_USES_R4K_TLB)
case OPC_TLBWI:
gen_op_tlbwi();
opn = "tlbwi";
break;
case OPC_TLBWR:
gen_op_tlbwr();
opn = "tlbwr";
break;
case OPC_TLBP:
gen_op_tlbp();
opn = "tlbp";
break;
case OPC_TLBR:
gen_op_tlbr();
opn = "tlbr";
break;
#endif
case OPC_ERET:
opn = "eret";
save_cpu_state(ctx, 0);
gen_op_eret();
ctx->bstate = BS_EXCP;
break;
case OPC_DERET:
opn = "deret";
if (!(ctx->hflags & MIPS_HFLAG_DM)) {
generate_exception(ctx, EXCP_RI);
} else {
save_cpu_state(ctx, 0);
gen_op_deret();
ctx->bstate = BS_EXCP;
}
break;
case OPC_WAIT:
opn = "wait";
/* If we get an exception, we want to restart at next instruction */
ctx->pc += 4;
save_cpu_state(ctx, 1);
ctx->pc -= 4;
gen_op_wait();
ctx->bstate = BS_EXCP;
break;
default:
if (loglevel & CPU_LOG_TB_IN_ASM) {
fprintf(logfile, "Invalid CP0 opcode: %08x %03x %03x %03x\n",
ctx->opcode, ctx->opcode >> 26, ctx->opcode & 0x3F,
((ctx->opcode >> 16) & 0x1F));
}
generate_exception(ctx, EXCP_RI);
return;
}
MIPS_DEBUG("%s %s %d", opn, regnames[rt], rd);
}
/* Coprocessor 1 (FPU) */
/* ISA extensions */
/* MIPS16 extension to MIPS32 */
/* SmartMIPS extension to MIPS32 */
#ifdef TARGET_MIPS64
static void gen_arith64 (DisasContext *ctx, uint16_t opc)
{
if (func == 0x02 && rd == 0) {
/* NOP */
return;
}
if (rs == 0 || rt == 0) {
gen_op_reset_T0();
gen_op_save64();
} else {
gen_op_load_gpr_T0(rs);
gen_op_load_gpr_T1(rt);
gen_op_save64();
if (func & 0x01)
gen_op_mul64u();
else
gen_op_mul64s();
}
if (func & 0x02)
gen_op_add64();
else
gen_op_sub64();
}
/* Coprocessor 3 (FPU) */
/* MDMX extension to MIPS64 */
/* MIPS-3D extension to MIPS64 */
#endif
static void gen_blikely(DisasContext *ctx)
{
int l1;
l1 = gen_new_label();
gen_op_jnz_T2(l1);
gen_op_save_state(ctx->hflags & ~MIPS_HFLAG_BMASK);
gen_goto_tb(ctx, 1, ctx->pc + 4);
gen_set_label(l1);
}
static void decode_opc (DisasContext *ctx)
{
int32_t offset;
int rs, rt, rd, sa;
uint16_t op, op1;
int16_t imm;
if ((ctx->hflags & MIPS_HFLAG_BMASK) == MIPS_HFLAG_BL) {
/* Handle blikely not taken case */
MIPS_DEBUG("blikely condition (%08x)", ctx->pc + 4);
gen_blikely(ctx);
}
op = ctx->opcode >> 26;
rs = ((ctx->opcode >> 21) & 0x1F);
rt = ((ctx->opcode >> 16) & 0x1F);
rd = ((ctx->opcode >> 11) & 0x1F);
sa = ((ctx->opcode >> 6) & 0x1F);
imm = (int16_t)ctx->opcode;
switch (op) {
case 0x00: /* Special opcode */
op1 = ctx->opcode & 0x3F;
switch (op1) {
case 0x00: /* Arithmetic with immediate */
case 0x02 ... 0x03:
gen_arith_imm(ctx, op1 | EXT_SPECIAL, rd, rt, sa);
break;
case 0x04: /* Arithmetic */
case 0x06 ... 0x07:
case 0x0A ... 0x0B:
case 0x20 ... 0x27:
case 0x2A ... 0x2B:
gen_arith(ctx, op1 | EXT_SPECIAL, rd, rs, rt);
break;
case 0x18 ... 0x1B: /* MULT / DIV */
gen_muldiv(ctx, op1 | EXT_SPECIAL, rs, rt);
break;
case 0x08 ... 0x09: /* Jumps */
gen_compute_branch(ctx, op1 | EXT_SPECIAL, rs, rd, sa);
return;
case 0x30 ... 0x34: /* Traps */
case 0x36:
gen_trap(ctx, op1 | EXT_SPECIAL, rs, rt, -1);
break;
case 0x10: /* Move from HI/LO */
case 0x12:
gen_HILO(ctx, op1 | EXT_SPECIAL, rd);
break;
case 0x11:
case 0x13: /* Move to HI/LO */
gen_HILO(ctx, op1 | EXT_SPECIAL, rs);
break;
case 0x0C: /* SYSCALL */
generate_exception(ctx, EXCP_SYSCALL);
break;
case 0x0D: /* BREAK */
generate_exception(ctx, EXCP_BREAK);
break;
case 0x0F: /* SYNC */
/* Treat as a noop */
break;
case 0x05: /* Pmon entry point */
gen_op_pmon((ctx->opcode >> 6) & 0x1F);
break;
case 0x01: /* MOVCI */
#if defined (MIPS_HAS_MOVCI)
/* XXX */
#else
/* Not implemented */
generate_exception_err (ctx, EXCP_CpU, 1);
#endif
break;
#if defined (TARGET_MIPS64)
case 0x14: /* MIPS64 specific opcodes */
case 0x16:
case 0x17:
case 0x1C ... 0x1F:
case 0x2C ... 0x2F:
case 0x37:
case 0x39 ... 0x3B:
case 0x3E ... 0x3F:
#endif
default: /* Invalid */
MIPS_INVAL("special");
generate_exception(ctx, EXCP_RI);
break;
}
break;
case 0x1C: /* Special2 opcode */
op1 = ctx->opcode & 0x3F;
switch (op1) {
#if defined (MIPS_USES_R4K_EXT)
/* Those instructions are not part of MIPS32 core */
case 0x00 ... 0x01: /* Multiply and add/sub */
case 0x04 ... 0x05:
gen_muldiv(ctx, op1 | EXT_SPECIAL2, rs, rt);
break;
case 0x02: /* MUL */
gen_arith(ctx, op1 | EXT_SPECIAL2, rd, rs, rt);
break;
case 0x20 ... 0x21: /* CLO / CLZ */
gen_cl(ctx, op1 | EXT_SPECIAL2, rd, rs);
break;
#endif
case 0x3F: /* SDBBP */
/* XXX: not clear which exception should be raised
* when in debug mode...
*/
if (!(ctx->hflags & MIPS_HFLAG_DM)) {
generate_exception(ctx, EXCP_DBp);
} else {
generate_exception(ctx, EXCP_DBp);
}
/* Treat as a noop */
break;
default: /* Invalid */
MIPS_INVAL("special2");
generate_exception(ctx, EXCP_RI);
break;
}
break;
case 0x01: /* B REGIMM opcode */
op1 = ((ctx->opcode >> 16) & 0x1F);
switch (op1) {
case 0x00 ... 0x03: /* REGIMM branches */
case 0x10 ... 0x13:
gen_compute_branch(ctx, op1 | EXT_REGIMM, rs, -1, imm << 2);
return;
case 0x08 ... 0x0C: /* Traps */
case 0x0E:
gen_trap(ctx, op1 | EXT_REGIMM, rs, -1, imm);
break;
default: /* Invalid */
MIPS_INVAL("REGIMM");
generate_exception(ctx, EXCP_RI);
break;
}
break;
case 0x10: /* CP0 opcode */
op1 = ((ctx->opcode >> 21) & 0x1F);
switch (op1) {
case 0x00:
case 0x04:
gen_cp0(ctx, op1 | EXT_CP0, rt, rd);
break;
default:
gen_cp0(ctx, (ctx->opcode & 0x3F) | EXT_CP0, rt, rd);
break;
}
break;
case 0x08 ... 0x0F: /* Arithmetic with immediate opcode */
gen_arith_imm(ctx, op, rt, rs, imm);
break;
case 0x02 ... 0x03: /* Jump */
offset = (int32_t)(ctx->opcode & 0x03FFFFFF) << 2;
gen_compute_branch(ctx, op, rs, rt, offset);
return;
case 0x04 ... 0x07: /* Branch */
case 0x14 ... 0x17:
gen_compute_branch(ctx, op, rs, rt, imm << 2);
return;
case 0x20 ... 0x26: /* Load and stores */
case 0x28 ... 0x2E:
case 0x30:
case 0x38:
gen_ldst(ctx, op, rt, rs, imm);
break;
case 0x2F: /* Cache operation */
/* Treat as a noop */
break;
case 0x33: /* Prefetch */
/* Treat as a noop */
break;
case 0x3F: /* HACK */
break;
/* Floating point. */
case 0x31: /* LWC1 */
case 0x35: /* LDC1 */
case 0x39: /* SWC1 */
case 0x3D: /* SDC1 */
case 0x11: /* CP1 opcode */
#if defined(MIPS_USES_FPU)
/* XXX: not correct */
#else
generate_exception_err(ctx, EXCP_CpU, 1);
#endif
break;
/* COP2. */
case 0x32: /* LWC2 */
case 0x36: /* LDC2 */
case 0x3A: /* SWC2 */
case 0x3E: /* SDC2 */
case 0x12: /* CP2 opcode */
/* Not implemented */
generate_exception_err(ctx, EXCP_CpU, 2);
break;
case 0x13: /* CP3 opcode */
/* Not implemented */
generate_exception_err(ctx, EXCP_CpU, 3);
break;
#if defined (TARGET_MIPS64)
case 0x18 ... 0x1B:
case 0x27:
case 0x34:
case 0x37:
/* MIPS64 opcodes */
#endif
#if defined (MIPS_HAS_JALX)
case 0x1D:
/* JALX: not implemented */
#endif
case 0x1E:
/* ASE specific */
default: /* Invalid */
MIPS_INVAL("");
generate_exception(ctx, EXCP_RI);
break;
}
if (ctx->hflags & MIPS_HFLAG_BMASK) {
int hflags = ctx->hflags;
/* Branches completion */
ctx->hflags &= ~MIPS_HFLAG_BMASK;
ctx->bstate = BS_BRANCH;
save_cpu_state(ctx, 0);
switch (hflags & MIPS_HFLAG_BMASK) {
case MIPS_HFLAG_B:
/* unconditional branch */
MIPS_DEBUG("unconditional branch");
gen_goto_tb(ctx, 0, ctx->btarget);
break;
case MIPS_HFLAG_BL:
/* blikely taken case */
MIPS_DEBUG("blikely branch taken");
gen_goto_tb(ctx, 0, ctx->btarget);
break;
case MIPS_HFLAG_BC:
/* Conditional branch */
MIPS_DEBUG("conditional branch");
{
int l1;
l1 = gen_new_label();
gen_op_jnz_T2(l1);
gen_goto_tb(ctx, 1, ctx->pc + 4);
gen_set_label(l1);
gen_goto_tb(ctx, 0, ctx->btarget);
}
break;
case MIPS_HFLAG_BR:
/* unconditional branch to register */
MIPS_DEBUG("branch to register");
gen_op_breg();
break;
default:
MIPS_DEBUG("unknown branch");
break;
}
}
}
int gen_intermediate_code_internal (CPUState *env, TranslationBlock *tb,
int search_pc)
{
DisasContext ctx, *ctxp = &ctx;
target_ulong pc_start;
uint16_t *gen_opc_end;
int j, lj = -1;
if (search_pc && loglevel)
fprintf (logfile, "search pc %d\n", search_pc);
pc_start = tb->pc;
gen_opc_ptr = gen_opc_buf;
gen_opc_end = gen_opc_buf + OPC_MAX_SIZE;
gen_opparam_ptr = gen_opparam_buf;
nb_gen_labels = 0;
ctx.pc = pc_start;
ctx.saved_pc = -1;
ctx.tb = tb;
ctx.bstate = BS_NONE;
/* Restore delay slot state from the tb context. */
ctx.hflags = tb->flags;
ctx.saved_hflags = ctx.hflags;
if (ctx.hflags & MIPS_HFLAG_BR) {
gen_op_restore_breg_target();
} else if (ctx.hflags & MIPS_HFLAG_B) {
ctx.btarget = env->btarget;
} else if (ctx.hflags & MIPS_HFLAG_BMASK) {
/* If we are in the delay slot of a conditional branch,
* restore the branch condition from env->bcond to T2
*/
ctx.btarget = env->btarget;
gen_op_restore_bcond();
}
#if defined(CONFIG_USER_ONLY)
ctx.mem_idx = 0;
#else
ctx.mem_idx = (ctx.hflags & MIPS_HFLAG_MODE) == MIPS_HFLAG_UM ? 0 : 1;
#endif
ctx.CP0_Status = env->CP0_Status;
#ifdef DEBUG_DISAS
if (loglevel & CPU_LOG_TB_CPU) {
fprintf(logfile, "------------------------------------------------\n");
/* FIXME: This may print out stale hflags from env... */
cpu_dump_state(env, logfile, fprintf, 0);
}
#endif
#if defined MIPS_DEBUG_DISAS
if (loglevel & CPU_LOG_TB_IN_ASM)
fprintf(logfile, "\ntb %p super %d cond %04x\n",
tb, ctx.mem_idx, ctx.hflags);
#endif
while (ctx.bstate == BS_NONE && gen_opc_ptr < gen_opc_end) {
if (env->nb_breakpoints > 0) {
for(j = 0; j < env->nb_breakpoints; j++) {
if (env->breakpoints[j] == ctx.pc) {
save_cpu_state(ctxp, 1);
ctx.bstate = BS_BRANCH;
gen_op_debug();
goto done_generating;
}
}
}
if (search_pc) {
j = gen_opc_ptr - gen_opc_buf;
if (lj < j) {
lj++;
while (lj < j)
gen_opc_instr_start[lj++] = 0;
}
gen_opc_pc[lj] = ctx.pc;
gen_opc_hflags[lj] = ctx.hflags & MIPS_HFLAG_BMASK;
gen_opc_instr_start[lj] = 1;
}
ctx.opcode = ldl_code(ctx.pc);
decode_opc(&ctx);
ctx.pc += 4;
if (env->singlestep_enabled)
break;
if ((ctx.pc & (TARGET_PAGE_SIZE - 1)) == 0)
break;
#if defined (MIPS_SINGLE_STEP)
break;
#endif
}
if (env->singlestep_enabled) {
save_cpu_state(ctxp, ctx.bstate == BS_NONE);
gen_op_debug();
goto done_generating;
}
else if (ctx.bstate != BS_BRANCH && ctx.bstate != BS_EXCP) {
save_cpu_state(ctxp, 0);
gen_goto_tb(&ctx, 0, ctx.pc);
}
gen_op_reset_T0();
/* Generate the return instruction */
gen_op_exit_tb();
done_generating:
*gen_opc_ptr = INDEX_op_end;
if (search_pc) {
j = gen_opc_ptr - gen_opc_buf;
lj++;
while (lj <= j)
gen_opc_instr_start[lj++] = 0;
tb->size = 0;
} else {
tb->size = ctx.pc - pc_start;
}
#ifdef DEBUG_DISAS
#if defined MIPS_DEBUG_DISAS
if (loglevel & CPU_LOG_TB_IN_ASM)
fprintf(logfile, "\n");
#endif
if (loglevel & CPU_LOG_TB_IN_ASM) {
fprintf(logfile, "IN: %s\n", lookup_symbol(pc_start));
target_disas(logfile, pc_start, ctx.pc - pc_start, 0);
fprintf(logfile, "\n");
}
if (loglevel & CPU_LOG_TB_OP) {
fprintf(logfile, "OP:\n");
dump_ops(gen_opc_buf, gen_opparam_buf);
fprintf(logfile, "\n");
}
if (loglevel & CPU_LOG_TB_CPU) {
fprintf(logfile, "---------------- %d %08x\n", ctx.bstate, ctx.hflags);
}
#endif
return 0;
}
int gen_intermediate_code (CPUState *env, struct TranslationBlock *tb)
{
return gen_intermediate_code_internal(env, tb, 0);
}
int gen_intermediate_code_pc (CPUState *env, struct TranslationBlock *tb)
{
return gen_intermediate_code_internal(env, tb, 1);
}
void cpu_dump_state (CPUState *env, FILE *f,
int (*cpu_fprintf)(FILE *f, const char *fmt, ...),
int flags)
{
uint32_t c0_status;
int i;
cpu_fprintf(f, "pc=0x%08x HI=0x%08x LO=0x%08x ds %04x %08x %d\n",
env->PC, env->HI, env->LO, env->hflags, env->btarget, env->bcond);
for (i = 0; i < 32; i++) {
if ((i & 3) == 0)
cpu_fprintf(f, "GPR%02d:", i);
cpu_fprintf(f, " %s %08x", regnames[i], env->gpr[i]);
if ((i & 3) == 3)
cpu_fprintf(f, "\n");
}
c0_status = env->CP0_Status;
if (env->hflags & MIPS_HFLAG_UM)
c0_status |= (1 << CP0St_UM);
if (env->hflags & MIPS_HFLAG_ERL)
c0_status |= (1 << CP0St_ERL);
if (env->hflags & MIPS_HFLAG_EXL)
c0_status |= (1 << CP0St_EXL);
cpu_fprintf(f, "CP0 Status 0x%08x Cause 0x%08x EPC 0x%08x\n",
c0_status, env->CP0_Cause, env->CP0_EPC);
cpu_fprintf(f, " Config0 0x%08x Config1 0x%08x LLAddr 0x%08x\n",
env->CP0_Config0, env->CP0_Config1, env->CP0_LLAddr);
}
CPUMIPSState *cpu_mips_init (void)
{
CPUMIPSState *env;
env = qemu_mallocz(sizeof(CPUMIPSState));
if (!env)
return NULL;
cpu_exec_init(env);
tlb_flush(env, 1);
/* Minimal init */
env->PC = 0xBFC00000;
#if defined (MIPS_USES_R4K_TLB)
env->CP0_random = MIPS_TLB_NB - 1;
#endif
env->CP0_Wired = 0;
env->CP0_Config0 = MIPS_CONFIG0;
#if defined (MIPS_CONFIG1)
env->CP0_Config1 = MIPS_CONFIG1;
#endif
#if defined (MIPS_CONFIG2)
env->CP0_Config2 = MIPS_CONFIG2;
#endif
#if defined (MIPS_CONFIG3)
env->CP0_Config3 = MIPS_CONFIG3;
#endif
env->CP0_Status = (1 << CP0St_CU0) | (1 << CP0St_BEV);
env->CP0_WatchLo = 0;
env->hflags = MIPS_HFLAG_ERL;
/* Count register increments in debug mode, EJTAG version 1 */
env->CP0_Debug = (1 << CP0DB_CNT) | (0x1 << CP0DB_VER);
env->CP0_PRid = MIPS_CPU;
env->exception_index = EXCP_NONE;
#if defined(CONFIG_USER_ONLY)
env->hflags |= MIPS_HFLAG_UM;
#endif
return env;
}
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