qemu/target-tricore/translate.c

/*
 *  TriCore emulation for qemu: main translation routines.
 *
 *  Copyright (c) 2013-2014 Bastian Koppelmann C-Lab/University Paderborn
 *
 * 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 "cpu.h"
#include "disas/disas.h"
#include "tcg-op.h"
#include "exec/cpu_ldst.h"

#include "exec/helper-proto.h"
#include "exec/helper-gen.h"

#include "tricore-opcodes.h"
/*
 * TCG registers
 */
static TCGv cpu_PC;
static TCGv cpu_PCXI;
static TCGv cpu_PSW;
static TCGv cpu_ICR;
/* GPR registers */
static TCGv cpu_gpr_a[16];
static TCGv cpu_gpr_d[16];
/* PSW Flag cache */
static TCGv cpu_PSW_C;
static TCGv cpu_PSW_V;
static TCGv cpu_PSW_SV;
static TCGv cpu_PSW_AV;
static TCGv cpu_PSW_SAV;
/* CPU env */
static TCGv_ptr cpu_env;

#include "exec/gen-icount.h"

static const char *regnames_a[] = {
      "a0"  , "a1"  , "a2"  , "a3" , "a4"  , "a5" ,
      "a6"  , "a7"  , "a8"  , "a9" , "sp" , "a11" ,
      "a12" , "a13" , "a14" , "a15",
    };

static const char *regnames_d[] = {
      "d0"  , "d1"  , "d2"  , "d3" , "d4"  , "d5"  ,
      "d6"  , "d7"  , "d8"  , "d9" , "d10" , "d11" ,
      "d12" , "d13" , "d14" , "d15",
    };

typedef struct DisasContext {
    struct TranslationBlock *tb;
    target_ulong pc, saved_pc, next_pc;
    uint32_t opcode;
    int singlestep_enabled;
    /* Routine used to access memory */
    int mem_idx;
    uint32_t hflags, saved_hflags;
    int bstate;
} DisasContext;

enum {

    BS_NONE   = 0,
    BS_STOP   = 1,
    BS_BRANCH = 2,
    BS_EXCP   = 3,
};

void tricore_cpu_dump_state(CPUState *cs, FILE *f,
                            fprintf_function cpu_fprintf, int flags)
{
    TriCoreCPU *cpu = TRICORE_CPU(cs);
    CPUTriCoreState *env = &cpu->env;
    int i;

    cpu_fprintf(f, "PC=%08x\n", env->PC);
    for (i = 0; i < 16; ++i) {
        if ((i & 3) == 0) {
            cpu_fprintf(f, "GPR A%02d:", i);
        }
        cpu_fprintf(f, " %s " TARGET_FMT_lx, regnames_a[i], env->gpr_a[i]);
    }
    for (i = 0; i < 16; ++i) {
        if ((i & 3) == 0) {
            cpu_fprintf(f, "GPR D%02d:", i);
        }
        cpu_fprintf(f, " %s " TARGET_FMT_lx, regnames_d[i], env->gpr_d[i]);
    }

}

static void decode_16Bit_opc(CPUTriCoreState *env, DisasContext *ctx)
{
}

static void decode_32Bit_opc(CPUTriCoreState *env, DisasContext *ctx)
{
}

static void decode_opc(CPUTriCoreState *env, DisasContext *ctx, int *is_branch)
{
    /* 16-Bit Instruction */
    if ((ctx->opcode & 0x1) == 0) {
        ctx->next_pc = ctx->pc + 2;
        decode_16Bit_opc(env, ctx);
    /* 32-Bit Instruction */
    } else {
        ctx->next_pc = ctx->pc + 4;
        decode_32Bit_opc(env, ctx);
    }
}

static inline void
gen_intermediate_code_internal(TriCoreCPU *cpu, struct TranslationBlock *tb,
                              int search_pc)
{
    CPUState *cs = CPU(cpu);
    CPUTriCoreState *env = &cpu->env;
    DisasContext ctx;
    target_ulong pc_start;
    int num_insns;
    uint16_t *gen_opc_end;

    if (search_pc) {
        qemu_log("search pc %d\n", search_pc);
    }

    num_insns = 0;
    pc_start = tb->pc;
    gen_opc_end = tcg_ctx.gen_opc_buf + OPC_MAX_SIZE;
    ctx.pc = pc_start;
    ctx.saved_pc = -1;
    ctx.tb = tb;
    ctx.singlestep_enabled = cs->singlestep_enabled;
    ctx.bstate = BS_NONE;
    ctx.mem_idx = cpu_mmu_index(env);

    tcg_clear_temp_count();
    gen_tb_start();
    while (ctx.bstate == BS_NONE) {
        ctx.opcode = cpu_ldl_code(env, ctx.pc);
        decode_opc(env, &ctx, 0);

        num_insns++;

        if (tcg_ctx.gen_opc_ptr >= gen_opc_end) {
            break;
        }
        if (singlestep) {
            break;
        }
        ctx.pc = ctx.next_pc;
    }

    gen_tb_end(tb, num_insns);
    *tcg_ctx.gen_opc_ptr = INDEX_op_end;
    if (search_pc) {
        printf("done_generating search pc\n");
    } else {
        tb->size = ctx.pc - pc_start;
        tb->icount = num_insns;
    }
    if (tcg_check_temp_count()) {
        printf("LEAK at %08x\n", env->PC);
    }

#ifdef DEBUG_DISAS
    if (qemu_loglevel_mask(CPU_LOG_TB_IN_ASM)) {
        qemu_log("IN: %s\n", lookup_symbol(pc_start));
        log_target_disas(env, pc_start, ctx.pc - pc_start, 0);
        qemu_log("\n");
    }
#endif
}

void
gen_intermediate_code(CPUTriCoreState *env, struct TranslationBlock *tb)
{
    gen_intermediate_code_internal(tricore_env_get_cpu(env), tb, false);
}

void
gen_intermediate_code_pc(CPUTriCoreState *env, struct TranslationBlock *tb)
{
    gen_intermediate_code_internal(tricore_env_get_cpu(env), tb, true);
}

void
restore_state_to_opc(CPUTriCoreState *env, TranslationBlock *tb, int pc_pos)
{
    env->PC = tcg_ctx.gen_opc_pc[pc_pos];
}
/*
 *
 * Initialization
 *
 */

void cpu_state_reset(CPUTriCoreState *env)
{
    /* Reset Regs to Default Value */
    env->PSW = 0xb80;
}

static void tricore_tcg_init_csfr(void)
{
    cpu_PCXI = tcg_global_mem_new(TCG_AREG0,
                          offsetof(CPUTriCoreState, PCXI), "PCXI");
    cpu_PSW = tcg_global_mem_new(TCG_AREG0,
                          offsetof(CPUTriCoreState, PSW), "PSW");
    cpu_PC = tcg_global_mem_new(TCG_AREG0,
                          offsetof(CPUTriCoreState, PC), "PC");
    cpu_ICR = tcg_global_mem_new(TCG_AREG0,
                          offsetof(CPUTriCoreState, ICR), "ICR");
}

void tricore_tcg_init(void)
{
    int i;
    static int inited;
    if (inited) {
        return;
    }
    cpu_env = tcg_global_reg_new_ptr(TCG_AREG0, "env");
    /* reg init */
    for (i = 0 ; i < 16 ; i++) {
        cpu_gpr_a[i] = tcg_global_mem_new(TCG_AREG0,
                                          offsetof(CPUTriCoreState, gpr_a[i]),
                                          regnames_a[i]);
    }
    for (i = 0 ; i < 16 ; i++) {
        cpu_gpr_d[i] = tcg_global_mem_new(TCG_AREG0,
                                  offsetof(CPUTriCoreState, gpr_d[i]),
                                           regnames_d[i]);
    }
    tricore_tcg_init_csfr();
    /* init PSW flag cache */
    cpu_PSW_C = tcg_global_mem_new(TCG_AREG0,
                                   offsetof(CPUTriCoreState, PSW_USB_C),
                                   "PSW_C");
    cpu_PSW_V = tcg_global_mem_new(TCG_AREG0,
                                   offsetof(CPUTriCoreState, PSW_USB_V),
                                   "PSW_V");
    cpu_PSW_SV = tcg_global_mem_new(TCG_AREG0,
                                    offsetof(CPUTriCoreState, PSW_USB_SV),
                                    "PSW_SV");
    cpu_PSW_AV = tcg_global_mem_new(TCG_AREG0,
                                    offsetof(CPUTriCoreState, PSW_USB_AV),
                                    "PSW_AV");
    cpu_PSW_SAV = tcg_global_mem_new(TCG_AREG0,
                                     offsetof(CPUTriCoreState, PSW_USB_SAV),
                                     "PSW_SAV");
}