xref: /openbmc/qemu/target/mips/tcg/ldst_helper.c (revision 09b07f286d539a1fdd9b1cdb8f4de181c896af3a)

/*
 *  MIPS emulation load/store helpers for QEMU.
 *
 *  Copyright (c) 2004-2005 Jocelyn Mayer
 *
 * SPDX-License-Identifier: LGPL-2.1-or-later
 *
 * 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 2.1 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 "qemu/osdep.h"
#include "cpu.h"
#include "exec/helper-proto.h"
#include "exec/exec-all.h"
#include "exec/cpu_ldst.h"
#include "exec/memop.h"
#include "internal.h"

#ifndef CONFIG_USER_ONLY

#define HELPER_LD_ATOMIC(name, insn, almask, do_cast)                         \
target_ulong helper_##name(CPUMIPSState *env, target_ulong arg, int mem_idx)  \
{                                                                             \
    if (arg & almask) {                                                       \
        if (!(env->hflags & MIPS_HFLAG_DM)) {                                 \
            env->CP0_BadVAddr = arg;                                          \
        }                                                                     \
        do_raise_exception(env, EXCP_AdEL, GETPC());                          \
    }                                                                         \
    env->CP0_LLAddr = cpu_mips_translate_address(env, arg, MMU_DATA_LOAD,     \
                                                 GETPC());                    \
    env->lladdr = arg;                                                        \
    env->llval = do_cast cpu_##insn##_mmuidx_ra(env, arg, mem_idx, GETPC());  \
    return env->llval;                                                        \
}
HELPER_LD_ATOMIC(ll, ldl, 0x3, (target_long)(int32_t))
#ifdef TARGET_MIPS64
HELPER_LD_ATOMIC(lld, ldq, 0x7, (target_ulong))
#endif
#undef HELPER_LD_ATOMIC

#endif /* !CONFIG_USER_ONLY */

static inline bool cpu_is_bigendian(CPUMIPSState *env)
{
    return extract32(env->CP0_Config0, CP0C0_BE, 1);
}

static inline target_ulong get_lmask(CPUMIPSState *env,
                                     target_ulong value, unsigned bits)
{
    unsigned mask = (bits / BITS_PER_BYTE) - 1;

    value &= mask;

    if (!cpu_is_bigendian(env)) {
        value ^= mask;
    }

    return value;
}

void helper_swl(CPUMIPSState *env, target_ulong arg1, target_ulong arg2,
                int mem_idx)
{
    target_ulong lmask = get_lmask(env, arg2, 32);
    int dir = cpu_is_bigendian(env) ? 1 : -1;

    cpu_stb_mmuidx_ra(env, arg2, (uint8_t)(arg1 >> 24), mem_idx, GETPC());

    if (lmask <= 2) {
        cpu_stb_mmuidx_ra(env, arg2 + 1 * dir, (uint8_t)(arg1 >> 16),
                          mem_idx, GETPC());
    }

    if (lmask <= 1) {
        cpu_stb_mmuidx_ra(env, arg2 + 2 * dir, (uint8_t)(arg1 >> 8),
                          mem_idx, GETPC());
    }

    if (lmask == 0) {
        cpu_stb_mmuidx_ra(env, arg2 + 3 * dir, (uint8_t)arg1,
                          mem_idx, GETPC());
    }
}

void helper_swr(CPUMIPSState *env, target_ulong arg1, target_ulong arg2,
                int mem_idx)
{
    target_ulong lmask = get_lmask(env, arg2, 32);
    int dir = cpu_is_bigendian(env) ? 1 : -1;

    cpu_stb_mmuidx_ra(env, arg2, (uint8_t)arg1, mem_idx, GETPC());

    if (lmask >= 1) {
        cpu_stb_mmuidx_ra(env, arg2 - 1 * dir, (uint8_t)(arg1 >> 8),
                          mem_idx, GETPC());
    }

    if (lmask >= 2) {
        cpu_stb_mmuidx_ra(env, arg2 - 2 * dir, (uint8_t)(arg1 >> 16),
                          mem_idx, GETPC());
    }

    if (lmask == 3) {
        cpu_stb_mmuidx_ra(env, arg2 - 3 * dir, (uint8_t)(arg1 >> 24),
                          mem_idx, GETPC());
    }
}

#if defined(TARGET_MIPS64)
/*
 * "half" load and stores.  We must do the memory access inline,
 * or fault handling won't work.
 */

void helper_sdl(CPUMIPSState *env, target_ulong arg1, target_ulong arg2,
                int mem_idx)
{
    target_ulong lmask = get_lmask(env, arg2, 64);
    int dir = cpu_is_bigendian(env) ? 1 : -1;

    cpu_stb_mmuidx_ra(env, arg2, (uint8_t)(arg1 >> 56), mem_idx, GETPC());

    if (lmask <= 6) {
        cpu_stb_mmuidx_ra(env, arg2 + 1 * dir, (uint8_t)(arg1 >> 48),
                          mem_idx, GETPC());
    }

    if (lmask <= 5) {
        cpu_stb_mmuidx_ra(env, arg2 + 2 * dir, (uint8_t)(arg1 >> 40),
                          mem_idx, GETPC());
    }

    if (lmask <= 4) {
        cpu_stb_mmuidx_ra(env, arg2 + 3 * dir, (uint8_t)(arg1 >> 32),
                          mem_idx, GETPC());
    }

    if (lmask <= 3) {
        cpu_stb_mmuidx_ra(env, arg2 + 4 * dir, (uint8_t)(arg1 >> 24),
                          mem_idx, GETPC());
    }

    if (lmask <= 2) {
        cpu_stb_mmuidx_ra(env, arg2 + 5 * dir, (uint8_t)(arg1 >> 16),
                          mem_idx, GETPC());
    }

    if (lmask <= 1) {
        cpu_stb_mmuidx_ra(env, arg2 + 6 * dir, (uint8_t)(arg1 >> 8),
                          mem_idx, GETPC());
    }

    if (lmask <= 0) {
        cpu_stb_mmuidx_ra(env, arg2 + 7 * dir, (uint8_t)arg1,
                          mem_idx, GETPC());
    }
}

void helper_sdr(CPUMIPSState *env, target_ulong arg1, target_ulong arg2,
                int mem_idx)
{
    target_ulong lmask = get_lmask(env, arg2, 64);
    int dir = cpu_is_bigendian(env) ? 1 : -1;

    cpu_stb_mmuidx_ra(env, arg2, (uint8_t)arg1, mem_idx, GETPC());

    if (lmask >= 1) {
        cpu_stb_mmuidx_ra(env, arg2 - 1 * dir, (uint8_t)(arg1 >> 8),
                          mem_idx, GETPC());
    }

    if (lmask >= 2) {
        cpu_stb_mmuidx_ra(env, arg2 - 2 * dir, (uint8_t)(arg1 >> 16),
                          mem_idx, GETPC());
    }

    if (lmask >= 3) {
        cpu_stb_mmuidx_ra(env, arg2 - 3 * dir, (uint8_t)(arg1 >> 24),
                          mem_idx, GETPC());
    }

    if (lmask >= 4) {
        cpu_stb_mmuidx_ra(env, arg2 - 4 * dir, (uint8_t)(arg1 >> 32),
                          mem_idx, GETPC());
    }

    if (lmask >= 5) {
        cpu_stb_mmuidx_ra(env, arg2 - 5 * dir, (uint8_t)(arg1 >> 40),
                          mem_idx, GETPC());
    }

    if (lmask >= 6) {
        cpu_stb_mmuidx_ra(env, arg2 - 6 * dir, (uint8_t)(arg1 >> 48),
                          mem_idx, GETPC());
    }

    if (lmask == 7) {
        cpu_stb_mmuidx_ra(env, arg2 - 7 * dir, (uint8_t)(arg1 >> 56),
                          mem_idx, GETPC());
    }
}
#endif /* TARGET_MIPS64 */

static const int multiple_regs[] = { 16, 17, 18, 19, 20, 21, 22, 23, 30 };

void helper_lwm(CPUMIPSState *env, target_ulong addr, target_ulong reglist,
                uint32_t mem_idx)
{
    target_ulong base_reglist = reglist & 0xf;
    target_ulong do_r31 = reglist & 0x10;

    if (base_reglist > 0 && base_reglist <= ARRAY_SIZE(multiple_regs)) {
        target_ulong i;

        for (i = 0; i < base_reglist; i++) {
            env->active_tc.gpr[multiple_regs[i]] =
                (target_long)cpu_ldl_mmuidx_ra(env, addr, mem_idx, GETPC());
            addr += 4;
        }
    }

    if (do_r31) {
        env->active_tc.gpr[31] =
            (target_long)cpu_ldl_mmuidx_ra(env, addr, mem_idx, GETPC());
    }
}

void helper_swm(CPUMIPSState *env, target_ulong addr, target_ulong reglist,
                uint32_t mem_idx)
{
    target_ulong base_reglist = reglist & 0xf;
    target_ulong do_r31 = reglist & 0x10;

    if (base_reglist > 0 && base_reglist <= ARRAY_SIZE(multiple_regs)) {
        target_ulong i;

        for (i = 0; i < base_reglist; i++) {
            cpu_stl_mmuidx_ra(env, addr, env->active_tc.gpr[multiple_regs[i]],
                              mem_idx, GETPC());
            addr += 4;
        }
    }

    if (do_r31) {
        cpu_stl_mmuidx_ra(env, addr, env->active_tc.gpr[31], mem_idx, GETPC());
    }
}

#if defined(TARGET_MIPS64)
void helper_ldm(CPUMIPSState *env, target_ulong addr, target_ulong reglist,
                uint32_t mem_idx)
{
    target_ulong base_reglist = reglist & 0xf;
    target_ulong do_r31 = reglist & 0x10;

    if (base_reglist > 0 && base_reglist <= ARRAY_SIZE(multiple_regs)) {
        target_ulong i;

        for (i = 0; i < base_reglist; i++) {
            env->active_tc.gpr[multiple_regs[i]] =
                cpu_ldq_mmuidx_ra(env, addr, mem_idx, GETPC());
            addr += 8;
        }
    }

    if (do_r31) {
        env->active_tc.gpr[31] =
            cpu_ldq_mmuidx_ra(env, addr, mem_idx, GETPC());
    }
}

void helper_sdm(CPUMIPSState *env, target_ulong addr, target_ulong reglist,
                uint32_t mem_idx)
{
    target_ulong base_reglist = reglist & 0xf;
    target_ulong do_r31 = reglist & 0x10;

    if (base_reglist > 0 && base_reglist <= ARRAY_SIZE(multiple_regs)) {
        target_ulong i;

        for (i = 0; i < base_reglist; i++) {
            cpu_stq_mmuidx_ra(env, addr, env->active_tc.gpr[multiple_regs[i]],
                              mem_idx, GETPC());
            addr += 8;
        }
    }

    if (do_r31) {
        cpu_stq_mmuidx_ra(env, addr, env->active_tc.gpr[31], mem_idx, GETPC());
    }
}

#endif /* TARGET_MIPS64 */