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/*
 *  qemu user main
 *
 *  Copyright (c) 2003-2008 Fabrice Bellard
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
 *  MA 02110-1301, USA.
 */
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <machine/trap.h>

#include "qemu.h"
#include "qemu-common.h"
/* For tb_lock */
#include "exec-all.h"

#define DEBUG_LOGFILE "/tmp/qemu.log"

static const char *interp_prefix = CONFIG_QEMU_PREFIX;
const char *qemu_uname_release = CONFIG_UNAME_RELEASE;
extern char **environ;

/* XXX: on x86 MAP_GROWSDOWN only works if ESP <= address + 32, so
   we allocate a bigger stack. Need a better solution, for example
   by remapping the process stack directly at the right place */
unsigned long x86_stack_size = 512 * 1024;

void gemu_log(const char *fmt, ...)
{
    va_list ap;

    va_start(ap, fmt);
    vfprintf(stderr, fmt, ap);
    va_end(ap);
}

/* These are no-ops because we are not threadsafe.  */
static inline void cpu_exec_start(CPUState *env)
{
}

static inline void cpu_exec_end(CPUState *env)
{
}

static inline void start_exclusive(void)
{
}

static inline void end_exclusive(void)
{
}

void fork_start(void)
{
}

void fork_end(int child)
{
    if (child) {
        gdbserver_fork(thread_env);
    }
}

void cpu_list_lock(void)
{
}

void cpu_list_unlock(void)
{
}

#ifdef TARGET_SPARC
#define SPARC64_STACK_BIAS 2047

//#define DEBUG_WIN
/* WARNING: dealing with register windows _is_ complicated. More info
   can be found at http://www.sics.se/~psm/sparcstack.html */
static inline int get_reg_index(CPUSPARCState *env, int cwp, int index)
{
    index = (index + cwp * 16) % (16 * env->nwindows);
    /* wrap handling : if cwp is on the last window, then we use the
       registers 'after' the end */
    if (index < 8 && env->cwp == env->nwindows - 1)
        index += 16 * env->nwindows;
    return index;
}

/* save the register window 'cwp1' */
static inline void save_window_offset(CPUSPARCState *env, int cwp1)
{
    unsigned int i;
    abi_ulong sp_ptr;

    sp_ptr = env->regbase[get_reg_index(env, cwp1, 6)];
#ifdef TARGET_SPARC64
    if (sp_ptr & 3)
        sp_ptr += SPARC64_STACK_BIAS;
#endif
#if defined(DEBUG_WIN)
    printf("win_overflow: sp_ptr=0x" TARGET_ABI_FMT_lx " save_cwp=%d\n",
           sp_ptr, cwp1);
#endif
    for(i = 0; i < 16; i++) {
        /* FIXME - what to do if put_user() fails? */
        put_user_ual(env->regbase[get_reg_index(env, cwp1, 8 + i)], sp_ptr);
        sp_ptr += sizeof(abi_ulong);
    }
}

static void save_window(CPUSPARCState *env)
{
#ifndef TARGET_SPARC64
    unsigned int new_wim;
    new_wim = ((env->wim >> 1) | (env->wim << (env->nwindows - 1))) &
        ((1LL << env->nwindows) - 1);
    save_window_offset(env, cpu_cwp_dec(env, env->cwp - 2));
    env->wim = new_wim;
#else
    save_window_offset(env, cpu_cwp_dec(env, env->cwp - 2));
    env->cansave++;
    env->canrestore--;
#endif
}

static void restore_window(CPUSPARCState *env)
{
#ifndef TARGET_SPARC64
    unsigned int new_wim;
#endif
    unsigned int i, cwp1;
    abi_ulong sp_ptr;

#ifndef TARGET_SPARC64
    new_wim = ((env->wim << 1) | (env->wim >> (env->nwindows - 1))) &
        ((1LL << env->nwindows) - 1);
#endif

    /* restore the invalid window */
    cwp1 = cpu_cwp_inc(env, env->cwp + 1);
    sp_ptr = env->regbase[get_reg_index(env, cwp1, 6)];
#ifdef TARGET_SPARC64
    if (sp_ptr & 3)
        sp_ptr += SPARC64_STACK_BIAS;
#endif
#if defined(DEBUG_WIN)
    printf("win_underflow: sp_ptr=0x" TARGET_ABI_FMT_lx " load_cwp=%d\n",
           sp_ptr, cwp1);
#endif
    for(i = 0; i < 16; i++) {
        /* FIXME - what to do if get_user() fails? */
        get_user_ual(env->regbase[get_reg_index(env, cwp1, 8 + i)], sp_ptr);
        sp_ptr += sizeof(abi_ulong);
    }
#ifdef TARGET_SPARC64
    env->canrestore++;
    if (env->cleanwin < env->nwindows - 1)
        env->cleanwin++;
    env->cansave--;
#else
    env->wim = new_wim;
#endif
}

static void flush_windows(CPUSPARCState *env)
{
    int offset, cwp1;

    offset = 1;
    for(;;) {
        /* if restore would invoke restore_window(), then we can stop */
        cwp1 = cpu_cwp_inc(env, env->cwp + offset);
#ifndef TARGET_SPARC64
        if (env->wim & (1 << cwp1))
            break;
#else
        if (env->canrestore == 0)
            break;
        env->cansave++;
        env->canrestore--;
#endif
        save_window_offset(env, cwp1);
        offset++;
    }
    cwp1 = cpu_cwp_inc(env, env->cwp + 1);
#ifndef TARGET_SPARC64
    /* set wim so that restore will reload the registers */
    env->wim = 1 << cwp1;
#endif
#if defined(DEBUG_WIN)
    printf("flush_windows: nb=%d\n", offset - 1);
#endif
}

void cpu_loop(CPUSPARCState *env, enum BSDType bsd_type)
{
    int trapnr, ret, syscall_nr;
    //target_siginfo_t info;

    while (1) {
        trapnr = cpu_sparc_exec (env);

        switch (trapnr) {
#ifndef TARGET_SPARC64
        case 0x80:
#else
        case 0x100:
#endif
            syscall_nr = env->gregs[1];
            if (bsd_type == target_freebsd)
                ret = do_freebsd_syscall(env, syscall_nr,
                                         env->regwptr[0], env->regwptr[1],
                                         env->regwptr[2], env->regwptr[3],
                                         env->regwptr[4], env->regwptr[5]);
            else if (bsd_type == target_netbsd)
                ret = do_netbsd_syscall(env, syscall_nr,
                                        env->regwptr[0], env->regwptr[1],
                                        env->regwptr[2], env->regwptr[3],
                                        env->regwptr[4], env->regwptr[5]);
            else { //if (bsd_type == target_openbsd)
#if defined(TARGET_SPARC64)
                syscall_nr &= ~(TARGET_OPENBSD_SYSCALL_G7RFLAG |
                                TARGET_OPENBSD_SYSCALL_G2RFLAG);
#endif
                ret = do_openbsd_syscall(env, syscall_nr,
                                         env->regwptr[0], env->regwptr[1],
                                         env->regwptr[2], env->regwptr[3],
                                         env->regwptr[4], env->regwptr[5]);
            }
            if ((unsigned int)ret >= (unsigned int)(-515)) {
#if defined(TARGET_SPARC64) && !defined(TARGET_ABI32)
                env->xcc |= PSR_CARRY;
#else
                env->psr |= PSR_CARRY;
#endif
            } else {
#if defined(TARGET_SPARC64) && !defined(TARGET_ABI32)
                env->xcc &= ~PSR_CARRY;
#else
                env->psr &= ~PSR_CARRY;
#endif
            }
            env->regwptr[0] = ret;
            /* next instruction */
#if defined(TARGET_SPARC64)
            if (bsd_type == target_openbsd &&
                env->gregs[1] & TARGET_OPENBSD_SYSCALL_G2RFLAG) {
                env->pc = env->gregs[2];
                env->npc = env->pc + 4;
            } else if (bsd_type == target_openbsd &&
                       env->gregs[1] & TARGET_OPENBSD_SYSCALL_G7RFLAG) {
                env->pc = env->gregs[7];
                env->npc = env->pc + 4;
            } else {
                env->pc = env->npc;
                env->npc = env->npc + 4;
            }
#else
            env->pc = env->npc;
            env->npc = env->npc + 4;
#endif
            break;
        case 0x83: /* flush windows */
#ifdef TARGET_ABI32
        case 0x103:
#endif
            flush_windows(env);
            /* next instruction */
            env->pc = env->npc;
            env->npc = env->npc + 4;
            break;
#ifndef TARGET_SPARC64
        case TT_WIN_OVF: /* window overflow */
            save_window(env);
            break;
        case TT_WIN_UNF: /* window underflow */
            restore_window(env);
            break;
        case TT_TFAULT:
        case TT_DFAULT:
#if 0
            {
                info.si_signo = SIGSEGV;
                info.si_errno = 0;
                /* XXX: check env->error_code */
                info.si_code = TARGET_SEGV_MAPERR;
                info._sifields._sigfault._addr = env->mmuregs[4];
                queue_signal(env, info.si_signo, &info);
            }
#endif
            break;
#else
        case TT_SPILL: /* window overflow */
            save_window(env);
            break;
        case TT_FILL: /* window underflow */
            restore_window(env);
            break;
        case TT_TFAULT:
        case TT_DFAULT:
#if 0
            {
                info.si_signo = SIGSEGV;
                info.si_errno = 0;
                /* XXX: check env->error_code */
                info.si_code = TARGET_SEGV_MAPERR;
                if (trapnr == TT_DFAULT)
                    info._sifields._sigfault._addr = env->dmmuregs[4];
                else
                    info._sifields._sigfault._addr = env->tsptr->tpc;
                //queue_signal(env, info.si_signo, &info);
            }
#endif
            break;
#endif
        case EXCP_INTERRUPT:
            /* just indicate that signals should be handled asap */
            break;
        case EXCP_DEBUG:
            {
                int sig;

                sig = gdb_handlesig (env, TARGET_SIGTRAP);
#if 0
                if (sig)
                  {
                    info.si_signo = sig;
                    info.si_errno = 0;
                    info.si_code = TARGET_TRAP_BRKPT;
                    //queue_signal(env, info.si_signo, &info);
                  }
#endif
            }
            break;
        default:
            printf ("Unhandled trap: 0x%x\n", trapnr);
            cpu_dump_state(env, stderr, fprintf, 0);
            exit (1);
        }
        process_pending_signals (env);
    }
}

#endif

static void usage(void)
{
    printf("qemu-" TARGET_ARCH " version " QEMU_VERSION ", Copyright (c) 2003-2008 Fabrice Bellard\n"
           "usage: qemu-" TARGET_ARCH " [options] program [arguments...]\n"
           "BSD CPU emulator (compiled for %s emulation)\n"
           "\n"
           "Standard options:\n"
           "-h                print this help\n"
           "-g port           wait gdb connection to port\n"
           "-L path           set the elf interpreter prefix (default=%s)\n"
           "-s size           set the stack size in bytes (default=%ld)\n"
           "-cpu model        select CPU (-cpu ? for list)\n"
           "-drop-ld-preload  drop LD_PRELOAD for target process\n"
           "-bsd type         select emulated BSD type FreeBSD/NetBSD/OpenBSD (default)\n"
           "\n"
           "Debug options:\n"
           "-d options   activate log (logfile=%s)\n"
           "-p pagesize  set the host page size to 'pagesize'\n"
           "-strace      log system calls\n"
           "\n"
           "Environment variables:\n"
           "QEMU_STRACE       Print system calls and arguments similar to the\n"
           "                  'strace' program.  Enable by setting to any value.\n"
           ,
           TARGET_ARCH,
           interp_prefix,
           x86_stack_size,
           DEBUG_LOGFILE);
    exit(1);
}

THREAD CPUState *thread_env;

/* Assumes contents are already zeroed.  */
void init_task_state(TaskState *ts)
{
    int i;

    ts->used = 1;
    ts->first_free = ts->sigqueue_table;
    for (i = 0; i < MAX_SIGQUEUE_SIZE - 1; i++) {
        ts->sigqueue_table[i].next = &ts->sigqueue_table[i + 1];
    }
    ts->sigqueue_table[i].next = NULL;
}

int main(int argc, char **argv)
{
    const char *filename;
    const char *cpu_model;
    struct target_pt_regs regs1, *regs = &regs1;
    struct image_info info1, *info = &info1;
    TaskState ts1, *ts = &ts1;
    CPUState *env;
    int optind;
    const char *r;
    int gdbstub_port = 0;
    int drop_ld_preload = 0, environ_count = 0;
    char **target_environ, **wrk, **dst;
    enum BSDType bsd_type = target_openbsd;

    if (argc <= 1)
        usage();

    /* init debug */
    cpu_set_log_filename(DEBUG_LOGFILE);

    cpu_model = NULL;
    optind = 1;
    for(;;) {
        if (optind >= argc)
            break;
        r = argv[optind];
        if (r[0] != '-')
            break;
        optind++;
        r++;
        if (!strcmp(r, "-")) {
            break;
        } else if (!strcmp(r, "d")) {
            int mask;
            const CPULogItem *item;

            if (optind >= argc)
                break;

            r = argv[optind++];
            mask = cpu_str_to_log_mask(r);
            if (!mask) {
                printf("Log items (comma separated):\n");
                for(item = cpu_log_items; item->mask != 0; item++) {
                    printf("%-10s %s\n", item->name, item->help);
                }
                exit(1);
            }
            cpu_set_log(mask);
        } else if (!strcmp(r, "s")) {
            r = argv[optind++];
            x86_stack_size = strtol(r, (char **)&r, 0);
            if (x86_stack_size <= 0)
                usage();
            if (*r == 'M')
                x86_stack_size *= 1024 * 1024;
            else if (*r == 'k' || *r == 'K')
                x86_stack_size *= 1024;
        } else if (!strcmp(r, "L")) {
            interp_prefix = argv[optind++];
        } else if (!strcmp(r, "p")) {
            qemu_host_page_size = atoi(argv[optind++]);
            if (qemu_host_page_size == 0 ||
                (qemu_host_page_size & (qemu_host_page_size - 1)) != 0) {
                fprintf(stderr, "page size must be a power of two\n");
                exit(1);
            }
        } else if (!strcmp(r, "g")) {
            gdbstub_port = atoi(argv[optind++]);
        } else if (!strcmp(r, "r")) {
            qemu_uname_release = argv[optind++];
        } else if (!strcmp(r, "cpu")) {
            cpu_model = argv[optind++];
            if (strcmp(cpu_model, "?") == 0) {
/* XXX: implement xxx_cpu_list for targets that still miss it */
#if defined(cpu_list)
                    cpu_list(stdout, &fprintf);
#endif
                exit(1);
            }
        } else if (!strcmp(r, "drop-ld-preload")) {
            drop_ld_preload = 1;
        } else if (!strcmp(r, "bsd")) {
            if (!strcasecmp(argv[optind], "freebsd")) {
                bsd_type = target_freebsd;
            } else if (!strcasecmp(argv[optind], "netbsd")) {
                bsd_type = target_netbsd;
            } else if (!strcasecmp(argv[optind], "openbsd")) {
                bsd_type = target_openbsd;
            } else {
                usage();
            }
            optind++;
        } else if (!strcmp(r, "strace")) {
            do_strace = 1;
        } else
        {
            usage();
        }
    }
    if (optind >= argc)
        usage();
    filename = argv[optind];

    /* Zero out regs */
    memset(regs, 0, sizeof(struct target_pt_regs));

    /* Zero out image_info */
    memset(info, 0, sizeof(struct image_info));

    /* Scan interp_prefix dir for replacement files. */
    init_paths(interp_prefix);

    if (cpu_model == NULL) {
#if defined(TARGET_SPARC)
#ifdef TARGET_SPARC64
        cpu_model = "TI UltraSparc II";
#else
        cpu_model = "Fujitsu MB86904";
#endif
#else
        cpu_model = "any";
#endif
    }
    cpu_exec_init_all(0);
    /* NOTE: we need to init the CPU at this stage to get
       qemu_host_page_size */
    env = cpu_init(cpu_model);
    if (!env) {
        fprintf(stderr, "Unable to find CPU definition\n");
        exit(1);
    }
    thread_env = env;

    if (getenv("QEMU_STRACE")) {
        do_strace = 1;
    }

    wrk = environ;
    while (*(wrk++))
        environ_count++;

    target_environ = malloc((environ_count + 1) * sizeof(char *));
    if (!target_environ)
        abort();
    for (wrk = environ, dst = target_environ; *wrk; wrk++) {
        if (drop_ld_preload && !strncmp(*wrk, "LD_PRELOAD=", 11))
            continue;
        *(dst++) = strdup(*wrk);
    }
    *dst = NULL; /* NULL terminate target_environ */

    if (loader_exec(filename, argv+optind, target_environ, regs, info) != 0) {
        printf("Error loading %s\n", filename);
        _exit(1);
    }

    for (wrk = target_environ; *wrk; wrk++) {
        free(*wrk);
    }

    free(target_environ);

    if (qemu_log_enabled()) {
        log_page_dump();

        qemu_log("start_brk   0x" TARGET_ABI_FMT_lx "\n", info->start_brk);
        qemu_log("end_code    0x" TARGET_ABI_FMT_lx "\n", info->end_code);
        qemu_log("start_code  0x" TARGET_ABI_FMT_lx "\n",
                 info->start_code);
        qemu_log("start_data  0x" TARGET_ABI_FMT_lx "\n",
                 info->start_data);
        qemu_log("end_data    0x" TARGET_ABI_FMT_lx "\n", info->end_data);
        qemu_log("start_stack 0x" TARGET_ABI_FMT_lx "\n",
                 info->start_stack);
        qemu_log("brk         0x" TARGET_ABI_FMT_lx "\n", info->brk);
        qemu_log("entry       0x" TARGET_ABI_FMT_lx "\n", info->entry);
    }

    target_set_brk(info->brk);
    syscall_init();
    signal_init();

    /* build Task State */
    memset(ts, 0, sizeof(TaskState));
    init_task_state(ts);
    ts->info = info;
    env->opaque = ts;

#if defined(TARGET_SPARC)
    {
        int i;
        env->pc = regs->pc;
        env->npc = regs->npc;
        env->y = regs->y;
        for(i = 0; i < 8; i++)
            env->gregs[i] = regs->u_regs[i];
        for(i = 0; i < 8; i++)
            env->regwptr[i] = regs->u_regs[i + 8];
    }
#else
#error unsupported target CPU
#endif

    if (gdbstub_port) {
        gdbserver_start (gdbstub_port);
        gdb_handlesig(env, 0);
    }
    cpu_loop(env, bsd_type);
    /* never exits */
    return 0;
}