Add qemu 2.4.0

Change-Id: Ic99cbad4b61f8b127b7dc74d04576c0bcbaaf4f5
Signed-off-by: Yang Zhang <yang.z.zhang@intel.com>

1 files changed, 1139 insertions, 0 deletions

diff --git a/qemu/bsd-user/main.c b/qemu/bsd-user/main.c
new file mode 100644
index 000000000..ee68daa39
--- /dev/null
+++ b/qemu/bsd-user/main.c
@@ -0,0 +1,1139 @@
+/*
+ *  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, see <http://www.gnu.org/licenses/>.
+ */
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdarg.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <machine/trap.h>
+#include <sys/types.h>
+#include <sys/mman.h>
+
+#include "qemu.h"
+#include "qemu-common.h"
+/* For tb_lock */
+#include "cpu.h"
+#include "tcg.h"
+#include "qemu/timer.h"
+#include "qemu/envlist.h"
+
+int singlestep;
+#if defined(CONFIG_USE_GUEST_BASE)
+unsigned long mmap_min_addr;
+unsigned long guest_base;
+int have_guest_base;
+unsigned long reserved_va;
+#endif
+
+static const char *interp_prefix = CONFIG_QEMU_INTERP_PREFIX;
+const char *qemu_uname_release;
+extern char **environ;
+enum BSDType bsd_type;
+
+/* 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);
+}
+
+#if defined(TARGET_I386)
+int cpu_get_pic_interrupt(CPUX86State *env)
+{
+    return -1;
+}
+#endif
+
+/* These are no-ops because we are not threadsafe.  */
+static inline void cpu_exec_start(CPUArchState *env)
+{
+}
+
+static inline void cpu_exec_end(CPUArchState *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_cpu);
+    }
+}
+
+void cpu_list_lock(void)
+{
+}
+
+void cpu_list_unlock(void)
+{
+}
+
+#ifdef TARGET_I386
+/***********************************************************/
+/* CPUX86 core interface */
+
+uint64_t cpu_get_tsc(CPUX86State *env)
+{
+    return cpu_get_real_ticks();
+}
+
+static void write_dt(void *ptr, unsigned long addr, unsigned long limit,
+                     int flags)
+{
+    unsigned int e1, e2;
+    uint32_t *p;
+    e1 = (addr << 16) | (limit & 0xffff);
+    e2 = ((addr >> 16) & 0xff) | (addr & 0xff000000) | (limit & 0x000f0000);
+    e2 |= flags;
+    p = ptr;
+    p[0] = tswap32(e1);
+    p[1] = tswap32(e2);
+}
+
+static uint64_t *idt_table;
+#ifdef TARGET_X86_64
+static void set_gate64(void *ptr, unsigned int type, unsigned int dpl,
+                       uint64_t addr, unsigned int sel)
+{
+    uint32_t *p, e1, e2;
+    e1 = (addr & 0xffff) | (sel << 16);
+    e2 = (addr & 0xffff0000) | 0x8000 | (dpl << 13) | (type << 8);
+    p = ptr;
+    p[0] = tswap32(e1);
+    p[1] = tswap32(e2);
+    p[2] = tswap32(addr >> 32);
+    p[3] = 0;
+}
+/* only dpl matters as we do only user space emulation */
+static void set_idt(int n, unsigned int dpl)
+{
+    set_gate64(idt_table + n * 2, 0, dpl, 0, 0);
+}
+#else
+static void set_gate(void *ptr, unsigned int type, unsigned int dpl,
+                     uint32_t addr, unsigned int sel)
+{
+    uint32_t *p, e1, e2;
+    e1 = (addr & 0xffff) | (sel << 16);
+    e2 = (addr & 0xffff0000) | 0x8000 | (dpl << 13) | (type << 8);
+    p = ptr;
+    p[0] = tswap32(e1);
+    p[1] = tswap32(e2);
+}
+
+/* only dpl matters as we do only user space emulation */
+static void set_idt(int n, unsigned int dpl)
+{
+    set_gate(idt_table + n, 0, dpl, 0, 0);
+}
+#endif
+
+void cpu_loop(CPUX86State *env)
+{
+    X86CPU *cpu = x86_env_get_cpu(env);
+    CPUState *cs = CPU(cpu);
+    int trapnr;
+    abi_ulong pc;
+    //target_siginfo_t info;
+
+    for(;;) {
+        trapnr = cpu_x86_exec(cs);
+        switch(trapnr) {
+        case 0x80:
+            /* syscall from int $0x80 */
+            if (bsd_type == target_freebsd) {
+                abi_ulong params = (abi_ulong) env->regs[R_ESP] +
+                    sizeof(int32_t);
+                int32_t syscall_nr = env->regs[R_EAX];
+                int32_t arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8;
+
+                if (syscall_nr == TARGET_FREEBSD_NR_syscall) {
+                    get_user_s32(syscall_nr, params);
+                    params += sizeof(int32_t);
+                } else if (syscall_nr == TARGET_FREEBSD_NR___syscall) {
+                    get_user_s32(syscall_nr, params);
+                    params += sizeof(int64_t);
+                }
+                get_user_s32(arg1, params);
+                params += sizeof(int32_t);
+                get_user_s32(arg2, params);
+                params += sizeof(int32_t);
+                get_user_s32(arg3, params);
+                params += sizeof(int32_t);
+                get_user_s32(arg4, params);
+                params += sizeof(int32_t);
+                get_user_s32(arg5, params);
+                params += sizeof(int32_t);
+                get_user_s32(arg6, params);
+                params += sizeof(int32_t);
+                get_user_s32(arg7, params);
+                params += sizeof(int32_t);
+                get_user_s32(arg8, params);
+                env->regs[R_EAX] = do_freebsd_syscall(env,
+                                                      syscall_nr,
+                                                      arg1,
+                                                      arg2,
+                                                      arg3,
+                                                      arg4,
+                                                      arg5,
+                                                      arg6,
+                                                      arg7,
+                                                      arg8);
+            } else { //if (bsd_type == target_openbsd)
+                env->regs[R_EAX] = do_openbsd_syscall(env,
+                                                      env->regs[R_EAX],
+                                                      env->regs[R_EBX],
+                                                      env->regs[R_ECX],
+                                                      env->regs[R_EDX],
+                                                      env->regs[R_ESI],
+                                                      env->regs[R_EDI],
+                                                      env->regs[R_EBP]);
+            }
+            if (((abi_ulong)env->regs[R_EAX]) >= (abi_ulong)(-515)) {
+                env->regs[R_EAX] = -env->regs[R_EAX];
+                env->eflags |= CC_C;
+            } else {
+                env->eflags &= ~CC_C;
+            }
+            break;
+#ifndef TARGET_ABI32
+        case EXCP_SYSCALL:
+            /* syscall from syscall instruction */
+            if (bsd_type == target_freebsd)
+                env->regs[R_EAX] = do_freebsd_syscall(env,
+                                                      env->regs[R_EAX],
+                                                      env->regs[R_EDI],
+                                                      env->regs[R_ESI],
+                                                      env->regs[R_EDX],
+                                                      env->regs[R_ECX],
+                                                      env->regs[8],
+                                                      env->regs[9], 0, 0);
+            else { //if (bsd_type == target_openbsd)
+                env->regs[R_EAX] = do_openbsd_syscall(env,
+                                                      env->regs[R_EAX],
+                                                      env->regs[R_EDI],
+                                                      env->regs[R_ESI],
+                                                      env->regs[R_EDX],
+                                                      env->regs[10],
+                                                      env->regs[8],
+                                                      env->regs[9]);
+            }
+            env->eip = env->exception_next_eip;
+            if (((abi_ulong)env->regs[R_EAX]) >= (abi_ulong)(-515)) {
+                env->regs[R_EAX] = -env->regs[R_EAX];
+                env->eflags |= CC_C;
+            } else {
+                env->eflags &= ~CC_C;
+            }
+            break;
+#endif
+#if 0
+        case EXCP0B_NOSEG:
+        case EXCP0C_STACK:
+            info.si_signo = SIGBUS;
+            info.si_errno = 0;
+            info.si_code = TARGET_SI_KERNEL;
+            info._sifields._sigfault._addr = 0;
+            queue_signal(env, info.si_signo, &info);
+            break;
+        case EXCP0D_GPF:
+            /* XXX: potential problem if ABI32 */
+#ifndef TARGET_X86_64
+            if (env->eflags & VM_MASK) {
+                handle_vm86_fault(env);
+            } else
+#endif
+            {
+                info.si_signo = SIGSEGV;
+                info.si_errno = 0;
+                info.si_code = TARGET_SI_KERNEL;
+                info._sifields._sigfault._addr = 0;
+                queue_signal(env, info.si_signo, &info);
+            }
+            break;
+        case EXCP0E_PAGE:
+            info.si_signo = SIGSEGV;
+            info.si_errno = 0;
+            if (!(env->error_code & 1))
+                info.si_code = TARGET_SEGV_MAPERR;
+            else
+                info.si_code = TARGET_SEGV_ACCERR;
+            info._sifields._sigfault._addr = env->cr[2];
+            queue_signal(env, info.si_signo, &info);
+            break;
+        case EXCP00_DIVZ:
+#ifndef TARGET_X86_64
+            if (env->eflags & VM_MASK) {
+                handle_vm86_trap(env, trapnr);
+            } else
+#endif
+            {
+                /* division by zero */
+                info.si_signo = SIGFPE;
+                info.si_errno = 0;
+                info.si_code = TARGET_FPE_INTDIV;
+                info._sifields._sigfault._addr = env->eip;
+                queue_signal(env, info.si_signo, &info);
+            }
+            break;
+        case EXCP01_DB:
+        case EXCP03_INT3:
+#ifndef TARGET_X86_64
+            if (env->eflags & VM_MASK) {
+                handle_vm86_trap(env, trapnr);
+            } else
+#endif
+            {
+                info.si_signo = SIGTRAP;
+                info.si_errno = 0;
+                if (trapnr == EXCP01_DB) {
+                    info.si_code = TARGET_TRAP_BRKPT;
+                    info._sifields._sigfault._addr = env->eip;
+                } else {
+                    info.si_code = TARGET_SI_KERNEL;
+                    info._sifields._sigfault._addr = 0;
+                }
+                queue_signal(env, info.si_signo, &info);
+            }
+            break;
+        case EXCP04_INTO:
+        case EXCP05_BOUND:
+#ifndef TARGET_X86_64
+            if (env->eflags & VM_MASK) {
+                handle_vm86_trap(env, trapnr);
+            } else
+#endif
+            {
+                info.si_signo = SIGSEGV;
+                info.si_errno = 0;
+                info.si_code = TARGET_SI_KERNEL;
+                info._sifields._sigfault._addr = 0;
+                queue_signal(env, info.si_signo, &info);
+            }
+            break;
+        case EXCP06_ILLOP:
+            info.si_signo = SIGILL;
+            info.si_errno = 0;
+            info.si_code = TARGET_ILL_ILLOPN;
+            info._sifields._sigfault._addr = env->eip;
+            queue_signal(env, info.si_signo, &info);
+            break;
+#endif
+        case EXCP_INTERRUPT:
+            /* just indicate that signals should be handled asap */
+            break;
+#if 0
+        case EXCP_DEBUG:
+            {
+                int sig;
+
+                sig = gdb_handlesig (env, TARGET_SIGTRAP);
+                if (sig)
+                  {
+                    info.si_signo = sig;
+                    info.si_errno = 0;
+                    info.si_code = TARGET_TRAP_BRKPT;
+                    queue_signal(env, info.si_signo, &info);
+                  }
+            }
+            break;
+#endif
+        default:
+            pc = env->segs[R_CS].base + env->eip;
+            fprintf(stderr, "qemu: 0x%08lx: unhandled CPU exception 0x%x - aborting\n",
+                    (long)pc, trapnr);
+            abort();
+        }
+        process_pending_signals(env);
+    }
+}
+#endif
+
+#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)
+{
+    CPUState *cs = CPU(sparc_env_get_cpu(env));
+    int trapnr, ret, syscall_nr;
+    //target_siginfo_t info;
+
+    while (1) {
+        trapnr = cpu_sparc_exec(cs);
+
+        switch (trapnr) {
+#ifndef TARGET_SPARC64
+        case 0x80:
+#else
+        /* FreeBSD uses 0x141 for syscalls too */
+        case 0x141:
+            if (bsd_type != target_freebsd)
+                goto badtrap;
+        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], 0, 0);
+            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)) {
+                ret = -ret;
+#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(cs, 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:
+#ifdef TARGET_SPARC64
+        badtrap:
+#endif
+            printf ("Unhandled trap: 0x%x\n", trapnr);
+            cpu_dump_state(cs, stderr, fprintf, 0);
+            exit (1);
+        }
+        process_pending_signals (env);
+    }
+}
+
+#endif
+
+static void usage(void)
+{
+    printf("qemu-" TARGET_NAME " version " QEMU_VERSION ", Copyright (c) 2003-2008 Fabrice Bellard\n"
+           "usage: qemu-" TARGET_NAME " [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 help for list)\n"
+           "-drop-ld-preload  drop LD_PRELOAD for target process\n"
+           "-E var=value      sets/modifies targets environment variable(s)\n"
+           "-U var            unsets targets environment variable(s)\n"
+#if defined(CONFIG_USE_GUEST_BASE)
+           "-B address        set guest_base address to address\n"
+#endif
+           "-bsd type         select emulated BSD type FreeBSD/NetBSD/OpenBSD (default)\n"
+           "\n"
+           "Debug options:\n"
+           "-d item1[,...]    enable logging of specified items\n"
+           "                  (use '-d help' for a list of log items)\n"
+           "-D logfile        write logs to 'logfile' (default stderr)\n"
+           "-p pagesize       set the host page size to 'pagesize'\n"
+           "-singlestep       always run in singlestep mode\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"
+           "You can use -E and -U options to set/unset environment variables\n"
+           "for target process.  It is possible to provide several variables\n"
+           "by repeating the option.  For example:\n"
+           "    -E var1=val2 -E var2=val2 -U LD_PRELOAD -U LD_DEBUG\n"
+           "Note that if you provide several changes to single variable\n"
+           "last change will stay in effect.\n"
+           ,
+           TARGET_NAME,
+           interp_prefix,
+           x86_stack_size);
+    exit(1);
+}
+
+THREAD CPUState *thread_cpu;
+
+/* 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;
+    const char *log_file = NULL;
+    const char *log_mask = NULL;
+    struct target_pt_regs regs1, *regs = &regs1;
+    struct image_info info1, *info = &info1;
+    TaskState ts1, *ts = &ts1;
+    CPUArchState *env;
+    CPUState *cpu;
+    int optind;
+    const char *r;
+    int gdbstub_port = 0;
+    char **target_environ, **wrk;
+    envlist_t *envlist = NULL;
+    bsd_type = target_openbsd;
+
+    if (argc <= 1)
+        usage();
+
+    module_call_init(MODULE_INIT_QOM);
+
+    if ((envlist = envlist_create()) == NULL) {
+        (void) fprintf(stderr, "Unable to allocate envlist\n");
+        exit(1);
+    }
+
+    /* add current environment into the list */
+    for (wrk = environ; *wrk != NULL; wrk++) {
+        (void) envlist_setenv(envlist, *wrk);
+    }
+
+    cpu_model = NULL;
+#if defined(cpudef_setup)
+    cpudef_setup(); /* parse cpu definitions in target config file (TBD) */
+#endif
+
+    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")) {
+            if (optind >= argc) {
+                break;
+            }
+            log_mask = argv[optind++];
+        } else if (!strcmp(r, "D")) {
+            if (optind >= argc) {
+                break;
+            }
+            log_file = argv[optind++];
+        } else if (!strcmp(r, "E")) {
+            r = argv[optind++];
+            if (envlist_setenv(envlist, r) != 0)
+                usage();
+        } else if (!strcmp(r, "ignore-environment")) {
+            envlist_free(envlist);
+            if ((envlist = envlist_create()) == NULL) {
+                (void) fprintf(stderr, "Unable to allocate envlist\n");
+                exit(1);
+            }
+        } else if (!strcmp(r, "U")) {
+            r = argv[optind++];
+            if (envlist_unsetenv(envlist, r) != 0)
+                usage();
+        } 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 (is_help_option(cpu_model)) {
+/* XXX: implement xxx_cpu_list for targets that still miss it */
+#if defined(cpu_list)
+                    cpu_list(stdout, &fprintf);
+#endif
+                exit(1);
+            }
+#if defined(CONFIG_USE_GUEST_BASE)
+        } else if (!strcmp(r, "B")) {
+           guest_base = strtol(argv[optind++], NULL, 0);
+           have_guest_base = 1;
+#endif
+        } else if (!strcmp(r, "drop-ld-preload")) {
+            (void) envlist_unsetenv(envlist, "LD_PRELOAD");
+        } 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, "singlestep")) {
+            singlestep = 1;
+        } else if (!strcmp(r, "strace")) {
+            do_strace = 1;
+        } else
+        {
+            usage();
+        }
+    }
+
+    /* init debug */
+    qemu_set_log_filename(log_file);
+    if (log_mask) {
+        int mask;
+
+        mask = qemu_str_to_log_mask(log_mask);
+        if (!mask) {
+            qemu_print_log_usage(stdout);
+            exit(1);
+        }
+        qemu_set_log(mask);
+    }
+
+    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_I386)
+#ifdef TARGET_X86_64
+        cpu_model = "qemu64";
+#else
+        cpu_model = "qemu32";
+#endif
+#elif defined(TARGET_SPARC)
+#ifdef TARGET_SPARC64
+        cpu_model = "TI UltraSparc II";
+#else
+        cpu_model = "Fujitsu MB86904";
+#endif
+#else
+        cpu_model = "any";
+#endif
+    }
+    tcg_exec_init(0);
+    /* NOTE: we need to init the CPU at this stage to get
+       qemu_host_page_size */
+    cpu = cpu_init(cpu_model);
+    if (!cpu) {
+        fprintf(stderr, "Unable to find CPU definition\n");
+        exit(1);
+    }
+    env = cpu->env_ptr;
+#if defined(TARGET_SPARC) || defined(TARGET_PPC)
+    cpu_reset(cpu);
+#endif
+    thread_cpu = cpu;
+
+    if (getenv("QEMU_STRACE")) {
+        do_strace = 1;
+    }
+
+    target_environ = envlist_to_environ(envlist, NULL);
+    envlist_free(envlist);
+
+#if defined(CONFIG_USE_GUEST_BASE)
+    /*
+     * Now that page sizes are configured in cpu_init() we can do
+     * proper page alignment for guest_base.
+     */
+    guest_base = HOST_PAGE_ALIGN(guest_base);
+
+    /*
+     * Read in mmap_min_addr kernel parameter.  This value is used
+     * When loading the ELF image to determine whether guest_base
+     * is needed.
+     *
+     * When user has explicitly set the quest base, we skip this
+     * test.
+     */
+    if (!have_guest_base) {
+        FILE *fp;
+
+        if ((fp = fopen("/proc/sys/vm/mmap_min_addr", "r")) != NULL) {
+            unsigned long tmp;
+            if (fscanf(fp, "%lu", &tmp) == 1) {
+                mmap_min_addr = tmp;
+                qemu_log("host mmap_min_addr=0x%lx\n", mmap_min_addr);
+            }
+            fclose(fp);
+        }
+    }
+#endif /* CONFIG_USE_GUEST_BASE */
+
+    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()) {
+#if defined(CONFIG_USE_GUEST_BASE)
+        qemu_log("guest_base  0x%lx\n", guest_base);
+#endif
+        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();
+
+#if defined(CONFIG_USE_GUEST_BASE)
+    /* Now that we've loaded the binary, GUEST_BASE is fixed.  Delay
+       generating the prologue until now so that the prologue can take
+       the real value of GUEST_BASE into account.  */
+    tcg_prologue_init(&tcg_ctx);
+#endif
+
+    /* build Task State */
+    memset(ts, 0, sizeof(TaskState));
+    init_task_state(ts);
+    ts->info = info;
+    cpu->opaque = ts;
+
+#if defined(TARGET_I386)
+    env->cr[0] = CR0_PG_MASK | CR0_WP_MASK | CR0_PE_MASK;
+    env->hflags |= HF_PE_MASK | HF_CPL_MASK;
+    if (env->features[FEAT_1_EDX] & CPUID_SSE) {
+        env->cr[4] |= CR4_OSFXSR_MASK;
+        env->hflags |= HF_OSFXSR_MASK;
+    }
+#ifndef TARGET_ABI32
+    /* enable 64 bit mode if possible */
+    if (!(env->features[FEAT_8000_0001_EDX] & CPUID_EXT2_LM)) {
+        fprintf(stderr, "The selected x86 CPU does not support 64 bit mode\n");
+        exit(1);
+    }
+    env->cr[4] |= CR4_PAE_MASK;
+    env->efer |= MSR_EFER_LMA | MSR_EFER_LME;
+    env->hflags |= HF_LMA_MASK;
+#endif
+
+    /* flags setup : we activate the IRQs by default as in user mode */
+    env->eflags |= IF_MASK;
+
+    /* linux register setup */
+#ifndef TARGET_ABI32
+    env->regs[R_EAX] = regs->rax;
+    env->regs[R_EBX] = regs->rbx;
+    env->regs[R_ECX] = regs->rcx;
+    env->regs[R_EDX] = regs->rdx;
+    env->regs[R_ESI] = regs->rsi;
+    env->regs[R_EDI] = regs->rdi;
+    env->regs[R_EBP] = regs->rbp;
+    env->regs[R_ESP] = regs->rsp;
+    env->eip = regs->rip;
+#else
+    env->regs[R_EAX] = regs->eax;
+    env->regs[R_EBX] = regs->ebx;
+    env->regs[R_ECX] = regs->ecx;
+    env->regs[R_EDX] = regs->edx;
+    env->regs[R_ESI] = regs->esi;
+    env->regs[R_EDI] = regs->edi;
+    env->regs[R_EBP] = regs->ebp;
+    env->regs[R_ESP] = regs->esp;
+    env->eip = regs->eip;
+#endif
+
+    /* linux interrupt setup */
+#ifndef TARGET_ABI32
+    env->idt.limit = 511;
+#else
+    env->idt.limit = 255;
+#endif
+    env->idt.base = target_mmap(0, sizeof(uint64_t) * (env->idt.limit + 1),
+                                PROT_READ|PROT_WRITE,
+                                MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
+    idt_table = g2h(env->idt.base);
+    set_idt(0, 0);
+    set_idt(1, 0);
+    set_idt(2, 0);
+    set_idt(3, 3);
+    set_idt(4, 3);
+    set_idt(5, 0);
+    set_idt(6, 0);
+    set_idt(7, 0);
+    set_idt(8, 0);
+    set_idt(9, 0);
+    set_idt(10, 0);
+    set_idt(11, 0);
+    set_idt(12, 0);
+    set_idt(13, 0);
+    set_idt(14, 0);
+    set_idt(15, 0);
+    set_idt(16, 0);
+    set_idt(17, 0);
+    set_idt(18, 0);
+    set_idt(19, 0);
+    set_idt(0x80, 3);
+
+    /* linux segment setup */
+    {
+        uint64_t *gdt_table;
+        env->gdt.base = target_mmap(0, sizeof(uint64_t) * TARGET_GDT_ENTRIES,
+                                    PROT_READ|PROT_WRITE,
+                                    MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
+        env->gdt.limit = sizeof(uint64_t) * TARGET_GDT_ENTRIES - 1;
+        gdt_table = g2h(env->gdt.base);
+#ifdef TARGET_ABI32
+        write_dt(&gdt_table[__USER_CS >> 3], 0, 0xfffff,
+                 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | DESC_S_MASK |
+                 (3 << DESC_DPL_SHIFT) | (0xa << DESC_TYPE_SHIFT));
+#else
+        /* 64 bit code segment */
+        write_dt(&gdt_table[__USER_CS >> 3], 0, 0xfffff,
+                 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | DESC_S_MASK |
+                 DESC_L_MASK |
+                 (3 << DESC_DPL_SHIFT) | (0xa << DESC_TYPE_SHIFT));
+#endif
+        write_dt(&gdt_table[__USER_DS >> 3], 0, 0xfffff,
+                 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | DESC_S_MASK |
+                 (3 << DESC_DPL_SHIFT) | (0x2 << DESC_TYPE_SHIFT));
+    }
+
+    cpu_x86_load_seg(env, R_CS, __USER_CS);
+    cpu_x86_load_seg(env, R_SS, __USER_DS);
+#ifdef TARGET_ABI32
+    cpu_x86_load_seg(env, R_DS, __USER_DS);
+    cpu_x86_load_seg(env, R_ES, __USER_DS);
+    cpu_x86_load_seg(env, R_FS, __USER_DS);
+    cpu_x86_load_seg(env, R_GS, __USER_DS);
+    /* This hack makes Wine work... */
+    env->segs[R_FS].selector = 0;
+#else
+    cpu_x86_load_seg(env, R_DS, 0);
+    cpu_x86_load_seg(env, R_ES, 0);
+    cpu_x86_load_seg(env, R_FS, 0);
+    cpu_x86_load_seg(env, R_GS, 0);
+#endif
+#elif 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(cpu, 0);
+    }
+    cpu_loop(env);
+    /* never exits */
+    return 0;
+}