qemu

cpu_loop.c
197 строк · 6.4 Кб
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/*
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 *  qemu user cpu loop
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 *
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 *  Copyright (c) 2003-2008 Fabrice Bellard
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 *
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 *  This program is free software; you can redistribute it and/or modify
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 *  it under the terms of the GNU General Public License as published by
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 *  the Free Software Foundation; either version 2 of the License, or
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 *  (at your option) any later version.
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 *
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 *  This program is distributed in the hope that it will be useful,
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 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *  GNU General Public License for more details.
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 *
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 *  You should have received a copy of the GNU General Public License
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 *  along with this program; if not, see <http://www.gnu.org/licenses/>.
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 */
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#include "qemu/osdep.h"
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#include "qemu.h"
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#include "user-internals.h"
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#include "cpu_loop-common.h"
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#include "signal-common.h"
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static abi_ulong hppa_lws(CPUHPPAState *env)
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{
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    CPUState *cs = env_cpu(env);
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    uint32_t which = env->gr[20];
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    abi_ulong addr = env->gr[26];
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    abi_ulong old = env->gr[25];
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    abi_ulong new = env->gr[24];
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    abi_ulong size, ret;
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    switch (which) {
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    default:
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        return -TARGET_ENOSYS;
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    case 0: /* elf32 atomic 32bit cmpxchg */
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        if ((addr & 3) || !access_ok(cs, VERIFY_WRITE, addr, 4)) {
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            return -TARGET_EFAULT;
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        }
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        old = tswap32(old);
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        new = tswap32(new);
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        ret = qatomic_cmpxchg((uint32_t *)g2h(cs, addr), old, new);
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        ret = tswap32(ret);
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        break;
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    case 2: /* elf32 atomic "new" cmpxchg */
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        size = env->gr[23];
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        if (size >= 4) {
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            return -TARGET_ENOSYS;
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        }
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        if (((addr | old | new) & ((1 << size) - 1))
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            || !access_ok(cs, VERIFY_WRITE, addr, 1 << size)
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            || !access_ok(cs, VERIFY_READ, old, 1 << size)
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            || !access_ok(cs, VERIFY_READ, new, 1 << size)) {
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            return -TARGET_EFAULT;
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        }
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        /* Note that below we use host-endian loads so that the cmpxchg
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           can be host-endian as well.  */
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        switch (size) {
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        case 0:
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            old = *(uint8_t *)g2h(cs, old);
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            new = *(uint8_t *)g2h(cs, new);
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            ret = qatomic_cmpxchg((uint8_t *)g2h(cs, addr), old, new);
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            ret = ret != old;
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            break;
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        case 1:
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            old = *(uint16_t *)g2h(cs, old);
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            new = *(uint16_t *)g2h(cs, new);
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            ret = qatomic_cmpxchg((uint16_t *)g2h(cs, addr), old, new);
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            ret = ret != old;
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            break;
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        case 2:
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            old = *(uint32_t *)g2h(cs, old);
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            new = *(uint32_t *)g2h(cs, new);
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            ret = qatomic_cmpxchg((uint32_t *)g2h(cs, addr), old, new);
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            ret = ret != old;
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            break;
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        case 3:
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            {
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                uint64_t o64, n64, r64;
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                o64 = *(uint64_t *)g2h(cs, old);
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                n64 = *(uint64_t *)g2h(cs, new);
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#ifdef CONFIG_ATOMIC64
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                r64 = qatomic_cmpxchg__nocheck((aligned_uint64_t *)g2h(cs, addr),
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                                               o64, n64);
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                ret = r64 != o64;
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#else
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                start_exclusive();
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                r64 = *(uint64_t *)g2h(cs, addr);
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                ret = 1;
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                if (r64 == o64) {
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                    *(uint64_t *)g2h(cs, addr) = n64;
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                    ret = 0;
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                }
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                end_exclusive();
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#endif
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            }
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            break;
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        }
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        break;
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    }
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    env->gr[28] = ret;
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    return 0;
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}
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void cpu_loop(CPUHPPAState *env)
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{
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    CPUState *cs = env_cpu(env);
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    abi_ulong ret;
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    int trapnr;
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    while (1) {
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        cpu_exec_start(cs);
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        trapnr = cpu_exec(cs);
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        cpu_exec_end(cs);
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        process_queued_cpu_work(cs);
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        switch (trapnr) {
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        case EXCP_SYSCALL:
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            ret = do_syscall(env, env->gr[20],
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                             env->gr[26], env->gr[25],
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                             env->gr[24], env->gr[23],
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                             env->gr[22], env->gr[21], 0, 0);
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            switch (ret) {
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            default:
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                env->gr[28] = ret;
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                /* We arrived here by faking the gateway page.  Return.  */
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                env->iaoq_f = env->gr[31] | PRIV_USER;
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                env->iaoq_b = env->iaoq_f + 4;
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                break;
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            case -QEMU_ERESTARTSYS:
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            case -QEMU_ESIGRETURN:
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                break;
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            }
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            break;
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        case EXCP_SYSCALL_LWS:
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            env->gr[21] = hppa_lws(env);
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            /* We arrived here by faking the gateway page.  Return.  */
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            env->iaoq_f = env->gr[31] | PRIV_USER;
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            env->iaoq_b = env->iaoq_f + 4;
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            break;
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        case EXCP_IMP:
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            force_sig_fault(TARGET_SIGSEGV, TARGET_SEGV_MAPERR, env->iaoq_f);
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            break;
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        case EXCP_ILL:
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            force_sig_fault(TARGET_SIGILL, TARGET_ILL_ILLOPC, env->iaoq_f);
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            break;
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        case EXCP_PRIV_OPR:
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            /* check for glibc ABORT_INSTRUCTION "iitlbp %r0,(%sr0, %r0)" */
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            if (env->cr[CR_IIR] == 0x04000000) {
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                force_sig_fault(TARGET_SIGILL, TARGET_ILL_ILLOPC, env->iaoq_f);
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            } else {
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                force_sig_fault(TARGET_SIGILL, TARGET_ILL_PRVOPC, env->iaoq_f);
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            }
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            break;
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        case EXCP_PRIV_REG:
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            force_sig_fault(TARGET_SIGILL, TARGET_ILL_PRVREG, env->iaoq_f);
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            break;
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        case EXCP_OVERFLOW:
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            force_sig_fault(TARGET_SIGFPE, TARGET_FPE_INTOVF, env->iaoq_f);
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            break;
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        case EXCP_COND:
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            force_sig_fault(TARGET_SIGFPE, TARGET_FPE_CONDTRAP, env->iaoq_f);
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            break;
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        case EXCP_ASSIST:
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            force_sig_fault(TARGET_SIGFPE, 0, env->iaoq_f);
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            break;
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        case EXCP_BREAK:
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            force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->iaoq_f);
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            break;
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        case EXCP_DEBUG:
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            force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->iaoq_f);
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            break;
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        case EXCP_INTERRUPT:
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            /* just indicate that signals should be handled asap */
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            break;
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        default:
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            EXCP_DUMP(env, "qemu: unhandled CPU exception 0x%x - aborting\n", trapnr);
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            abort();
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        }
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        process_pending_signals(env);
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    }
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}
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void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
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{
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    int i;
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    for (i = 1; i < 32; i++) {
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        env->gr[i] = regs->gr[i];
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    }
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    env->iaoq_f = regs->iaoq[0];
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    env->iaoq_b = regs->iaoq[1];
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}
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