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Annotation of qemu/linux-user/vm86.c, revision 1.1

1.1     ! root        1: /*
        !             2:  *  vm86 linux syscall support
        !             3:  * 
        !             4:  *  Copyright (c) 2003 Fabrice Bellard
        !             5:  *
        !             6:  *  This program is free software; you can redistribute it and/or modify
        !             7:  *  it under the terms of the GNU General Public License as published by
        !             8:  *  the Free Software Foundation; either version 2 of the License, or
        !             9:  *  (at your option) any later version.
        !            10:  *
        !            11:  *  This program is distributed in the hope that it will be useful,
        !            12:  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            13:  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            14:  *  GNU General Public License for more details.
        !            15:  *
        !            16:  *  You should have received a copy of the GNU General Public License
        !            17:  *  along with this program; if not, write to the Free Software
        !            18:  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
        !            19:  */
        !            20: #include <stdlib.h>
        !            21: #include <stdio.h>
        !            22: #include <stdarg.h>
        !            23: #include <string.h>
        !            24: #include <errno.h>
        !            25: #include <unistd.h>
        !            26: 
        !            27: #include "qemu.h"
        !            28: 
        !            29: //#define DEBUG_VM86
        !            30: 
        !            31: #define set_flags(X,new,mask) \
        !            32: ((X) = ((X) & ~(mask)) | ((new) & (mask)))
        !            33: 
        !            34: #define SAFE_MASK      (0xDD5)
        !            35: #define RETURN_MASK    (0xDFF)
        !            36: 
        !            37: static inline int is_revectored(int nr, struct target_revectored_struct *bitmap)
        !            38: {
        !            39:     return (((uint8_t *)bitmap)[nr >> 3] >> (nr & 7)) & 1;
        !            40: }
        !            41: 
        !            42: static inline void vm_putw(uint8_t *segptr, unsigned int reg16, unsigned int val)
        !            43: {
        !            44:     stw(segptr + (reg16 & 0xffff), val);
        !            45: }
        !            46: 
        !            47: static inline void vm_putl(uint8_t *segptr, unsigned int reg16, unsigned int val)
        !            48: {
        !            49:     stl(segptr + (reg16 & 0xffff), val);
        !            50: }
        !            51: 
        !            52: static inline unsigned int vm_getw(uint8_t *segptr, unsigned int reg16)
        !            53: {
        !            54:     return lduw(segptr + (reg16 & 0xffff));
        !            55: }
        !            56: 
        !            57: static inline unsigned int vm_getl(uint8_t *segptr, unsigned int reg16)
        !            58: {
        !            59:     return ldl(segptr + (reg16 & 0xffff));
        !            60: }
        !            61: 
        !            62: void save_v86_state(CPUX86State *env)
        !            63: {
        !            64:     TaskState *ts = env->opaque;
        !            65: 
        !            66:     /* put the VM86 registers in the userspace register structure */
        !            67:     ts->target_v86->regs.eax = tswap32(env->regs[R_EAX]);
        !            68:     ts->target_v86->regs.ebx = tswap32(env->regs[R_EBX]);
        !            69:     ts->target_v86->regs.ecx = tswap32(env->regs[R_ECX]);
        !            70:     ts->target_v86->regs.edx = tswap32(env->regs[R_EDX]);
        !            71:     ts->target_v86->regs.esi = tswap32(env->regs[R_ESI]);
        !            72:     ts->target_v86->regs.edi = tswap32(env->regs[R_EDI]);
        !            73:     ts->target_v86->regs.ebp = tswap32(env->regs[R_EBP]);
        !            74:     ts->target_v86->regs.esp = tswap32(env->regs[R_ESP]);
        !            75:     ts->target_v86->regs.eip = tswap32(env->eip);
        !            76:     ts->target_v86->regs.cs = tswap16(env->segs[R_CS].selector);
        !            77:     ts->target_v86->regs.ss = tswap16(env->segs[R_SS].selector);
        !            78:     ts->target_v86->regs.ds = tswap16(env->segs[R_DS].selector);
        !            79:     ts->target_v86->regs.es = tswap16(env->segs[R_ES].selector);
        !            80:     ts->target_v86->regs.fs = tswap16(env->segs[R_FS].selector);
        !            81:     ts->target_v86->regs.gs = tswap16(env->segs[R_GS].selector);
        !            82:     set_flags(env->eflags, ts->v86flags, VIF_MASK | ts->v86mask);
        !            83:     ts->target_v86->regs.eflags = tswap32(env->eflags);
        !            84: #ifdef DEBUG_VM86
        !            85:     fprintf(logfile, "save_v86_state: eflags=%08x cs:ip=%04x:%04x\n", 
        !            86:             env->eflags, env->segs[R_CS].selector, env->eip);
        !            87: #endif
        !            88: 
        !            89:     /* restore 32 bit registers */
        !            90:     env->regs[R_EAX] = ts->vm86_saved_regs.eax;
        !            91:     env->regs[R_EBX] = ts->vm86_saved_regs.ebx;
        !            92:     env->regs[R_ECX] = ts->vm86_saved_regs.ecx;
        !            93:     env->regs[R_EDX] = ts->vm86_saved_regs.edx;
        !            94:     env->regs[R_ESI] = ts->vm86_saved_regs.esi;
        !            95:     env->regs[R_EDI] = ts->vm86_saved_regs.edi;
        !            96:     env->regs[R_EBP] = ts->vm86_saved_regs.ebp;
        !            97:     env->regs[R_ESP] = ts->vm86_saved_regs.esp;
        !            98:     env->eflags = ts->vm86_saved_regs.eflags;
        !            99:     env->eip = ts->vm86_saved_regs.eip;
        !           100: 
        !           101:     cpu_x86_load_seg(env, R_CS, ts->vm86_saved_regs.cs);
        !           102:     cpu_x86_load_seg(env, R_SS, ts->vm86_saved_regs.ss);
        !           103:     cpu_x86_load_seg(env, R_DS, ts->vm86_saved_regs.ds);
        !           104:     cpu_x86_load_seg(env, R_ES, ts->vm86_saved_regs.es);
        !           105:     cpu_x86_load_seg(env, R_FS, ts->vm86_saved_regs.fs);
        !           106:     cpu_x86_load_seg(env, R_GS, ts->vm86_saved_regs.gs);
        !           107: }
        !           108: 
        !           109: /* return from vm86 mode to 32 bit. The vm86() syscall will return
        !           110:    'retval' */
        !           111: static inline void return_to_32bit(CPUX86State *env, int retval)
        !           112: {
        !           113: #ifdef DEBUG_VM86
        !           114:     fprintf(logfile, "return_to_32bit: ret=0x%x\n", retval);
        !           115: #endif
        !           116:     save_v86_state(env);
        !           117:     env->regs[R_EAX] = retval;
        !           118: }
        !           119: 
        !           120: static inline int set_IF(CPUX86State *env)
        !           121: {
        !           122:     TaskState *ts = env->opaque;
        !           123:     
        !           124:     ts->v86flags |= VIF_MASK;
        !           125:     if (ts->v86flags & VIP_MASK) {
        !           126:         return_to_32bit(env, TARGET_VM86_STI);
        !           127:         return 1;
        !           128:     }
        !           129:     return 0;
        !           130: }
        !           131: 
        !           132: static inline void clear_IF(CPUX86State *env)
        !           133: {
        !           134:     TaskState *ts = env->opaque;
        !           135: 
        !           136:     ts->v86flags &= ~VIF_MASK;
        !           137: }
        !           138: 
        !           139: static inline void clear_TF(CPUX86State *env)
        !           140: {
        !           141:     env->eflags &= ~TF_MASK;
        !           142: }
        !           143: 
        !           144: static inline void clear_AC(CPUX86State *env)
        !           145: {
        !           146:     env->eflags &= ~AC_MASK;
        !           147: }
        !           148: 
        !           149: static inline int set_vflags_long(unsigned long eflags, CPUX86State *env)
        !           150: {
        !           151:     TaskState *ts = env->opaque;
        !           152: 
        !           153:     set_flags(ts->v86flags, eflags, ts->v86mask);
        !           154:     set_flags(env->eflags, eflags, SAFE_MASK);
        !           155:     if (eflags & IF_MASK)
        !           156:         return set_IF(env);
        !           157:     else
        !           158:         clear_IF(env);
        !           159:     return 0;
        !           160: }
        !           161: 
        !           162: static inline int set_vflags_short(unsigned short flags, CPUX86State *env)
        !           163: {
        !           164:     TaskState *ts = env->opaque;
        !           165: 
        !           166:     set_flags(ts->v86flags, flags, ts->v86mask & 0xffff);
        !           167:     set_flags(env->eflags, flags, SAFE_MASK);
        !           168:     if (flags & IF_MASK)
        !           169:         return set_IF(env);
        !           170:     else
        !           171:         clear_IF(env);
        !           172:     return 0;
        !           173: }
        !           174: 
        !           175: static inline unsigned int get_vflags(CPUX86State *env)
        !           176: {
        !           177:     TaskState *ts = env->opaque;
        !           178:     unsigned int flags;
        !           179: 
        !           180:     flags = env->eflags & RETURN_MASK;
        !           181:     if (ts->v86flags & VIF_MASK)
        !           182:         flags |= IF_MASK;
        !           183:     flags |= IOPL_MASK;
        !           184:     return flags | (ts->v86flags & ts->v86mask);
        !           185: }
        !           186: 
        !           187: #define ADD16(reg, val) reg = (reg & ~0xffff) | ((reg + (val)) & 0xffff)
        !           188: 
        !           189: /* handle VM86 interrupt (NOTE: the CPU core currently does not
        !           190:    support TSS interrupt revectoring, so this code is always executed) */
        !           191: static void do_int(CPUX86State *env, int intno)
        !           192: {
        !           193:     TaskState *ts = env->opaque;
        !           194:     uint32_t *int_ptr, segoffs;
        !           195:     uint8_t *ssp;
        !           196:     unsigned int sp;
        !           197: 
        !           198:     if (env->segs[R_CS].selector == TARGET_BIOSSEG)
        !           199:         goto cannot_handle;
        !           200:     if (is_revectored(intno, &ts->vm86plus.int_revectored))
        !           201:         goto cannot_handle;
        !           202:     if (intno == 0x21 && is_revectored((env->regs[R_EAX] >> 8) & 0xff, 
        !           203:                                        &ts->vm86plus.int21_revectored))
        !           204:         goto cannot_handle;
        !           205:     int_ptr = (uint32_t *)(intno << 2);
        !           206:     segoffs = tswap32(*int_ptr);
        !           207:     if ((segoffs >> 16) == TARGET_BIOSSEG)
        !           208:         goto cannot_handle;
        !           209: #if defined(DEBUG_VM86)
        !           210:     fprintf(logfile, "VM86: emulating int 0x%x. CS:IP=%04x:%04x\n", 
        !           211:             intno, segoffs >> 16, segoffs & 0xffff);
        !           212: #endif
        !           213:     /* save old state */
        !           214:     ssp = (uint8_t *)(env->segs[R_SS].selector << 4);
        !           215:     sp = env->regs[R_ESP] & 0xffff;
        !           216:     vm_putw(ssp, sp - 2, get_vflags(env));
        !           217:     vm_putw(ssp, sp - 4, env->segs[R_CS].selector);
        !           218:     vm_putw(ssp, sp - 6, env->eip);
        !           219:     ADD16(env->regs[R_ESP], -6);
        !           220:     /* goto interrupt handler */
        !           221:     env->eip = segoffs & 0xffff;
        !           222:     cpu_x86_load_seg(env, R_CS, segoffs >> 16);
        !           223:     clear_TF(env);
        !           224:     clear_IF(env);
        !           225:     clear_AC(env);
        !           226:     return;
        !           227:  cannot_handle:
        !           228: #if defined(DEBUG_VM86)
        !           229:     fprintf(logfile, "VM86: return to 32 bits int 0x%x\n", intno);
        !           230: #endif
        !           231:     return_to_32bit(env, TARGET_VM86_INTx | (intno << 8));
        !           232: }
        !           233: 
        !           234: void handle_vm86_trap(CPUX86State *env, int trapno)
        !           235: {
        !           236:     if (trapno == 1 || trapno == 3) {
        !           237:         return_to_32bit(env, TARGET_VM86_TRAP + (trapno << 8));
        !           238:     } else {
        !           239:         do_int(env, trapno);
        !           240:     }
        !           241: }
        !           242: 
        !           243: #define CHECK_IF_IN_TRAP() \
        !           244:       if ((ts->vm86plus.vm86plus.flags & TARGET_vm86dbg_active) && \
        !           245:           (ts->vm86plus.vm86plus.flags & TARGET_vm86dbg_TFpendig)) \
        !           246:                newflags |= TF_MASK
        !           247: 
        !           248: #define VM86_FAULT_RETURN \
        !           249:         if ((ts->vm86plus.vm86plus.flags & TARGET_force_return_for_pic) && \
        !           250:             (ts->v86flags & (IF_MASK | VIF_MASK))) \
        !           251:             return_to_32bit(env, TARGET_VM86_PICRETURN); \
        !           252:         return
        !           253: 
        !           254: void handle_vm86_fault(CPUX86State *env)
        !           255: {
        !           256:     TaskState *ts = env->opaque;
        !           257:     uint8_t *csp, *pc, *ssp;
        !           258:     unsigned int ip, sp, newflags, newip, newcs, opcode, intno;
        !           259:     int data32, pref_done;
        !           260: 
        !           261:     csp = (uint8_t *)(env->segs[R_CS].selector << 4);
        !           262:     ip = env->eip & 0xffff;
        !           263:     pc = csp + ip;
        !           264:     
        !           265:     ssp = (uint8_t *)(env->segs[R_SS].selector << 4);
        !           266:     sp = env->regs[R_ESP] & 0xffff;
        !           267: 
        !           268: #if defined(DEBUG_VM86)
        !           269:     fprintf(logfile, "VM86 exception %04x:%08x %02x %02x\n",
        !           270:             env->segs[R_CS].selector, env->eip, pc[0], pc[1]);
        !           271: #endif
        !           272: 
        !           273:     data32 = 0;
        !           274:     pref_done = 0;
        !           275:     do {
        !           276:         opcode = csp[ip];
        !           277:         ADD16(ip, 1);
        !           278:         switch (opcode) {
        !           279:         case 0x66:      /* 32-bit data */     data32=1; break;
        !           280:         case 0x67:      /* 32-bit address */  break;
        !           281:         case 0x2e:      /* CS */              break;
        !           282:         case 0x3e:      /* DS */              break;
        !           283:         case 0x26:      /* ES */              break;
        !           284:         case 0x36:      /* SS */              break;
        !           285:         case 0x65:      /* GS */              break;
        !           286:         case 0x64:      /* FS */              break;
        !           287:         case 0xf2:      /* repnz */          break;
        !           288:         case 0xf3:      /* rep */             break;
        !           289:         default: pref_done = 1;
        !           290:         }
        !           291:     } while (!pref_done);
        !           292: 
        !           293:     /* VM86 mode */
        !           294:     switch(opcode) {
        !           295:     case 0x9c: /* pushf */
        !           296:         if (data32) {
        !           297:             vm_putl(ssp, sp - 4, get_vflags(env));
        !           298:             ADD16(env->regs[R_ESP], -4);
        !           299:         } else {
        !           300:             vm_putw(ssp, sp - 2, get_vflags(env));
        !           301:             ADD16(env->regs[R_ESP], -2);
        !           302:         }
        !           303:         env->eip = ip;
        !           304:         VM86_FAULT_RETURN;
        !           305: 
        !           306:     case 0x9d: /* popf */
        !           307:         if (data32) {
        !           308:             newflags = vm_getl(ssp, sp);
        !           309:             ADD16(env->regs[R_ESP], 4);
        !           310:         } else {
        !           311:             newflags = vm_getw(ssp, sp);
        !           312:             ADD16(env->regs[R_ESP], 2);
        !           313:         }
        !           314:         env->eip = ip;
        !           315:         CHECK_IF_IN_TRAP();
        !           316:         if (data32) {
        !           317:             if (set_vflags_long(newflags, env))
        !           318:                 return;
        !           319:         } else {
        !           320:             if (set_vflags_short(newflags, env))
        !           321:                 return;
        !           322:         }
        !           323:         VM86_FAULT_RETURN;
        !           324: 
        !           325:     case 0xcd: /* int */
        !           326:         intno = csp[ip];
        !           327:         ADD16(ip, 1);
        !           328:         env->eip = ip;
        !           329:         if (ts->vm86plus.vm86plus.flags & TARGET_vm86dbg_active) {
        !           330:             if ( (ts->vm86plus.vm86plus.vm86dbg_intxxtab[intno >> 3] >> 
        !           331:                   (intno &7)) & 1) {
        !           332:                 return_to_32bit(env, TARGET_VM86_INTx + (intno << 8));
        !           333:                 return;
        !           334:             }
        !           335:         }
        !           336:         do_int(env, intno);
        !           337:         break;
        !           338: 
        !           339:     case 0xcf: /* iret */
        !           340:         if (data32) {
        !           341:             newip = vm_getl(ssp, sp) & 0xffff;
        !           342:             newcs = vm_getl(ssp, sp + 4) & 0xffff;
        !           343:             newflags = vm_getl(ssp, sp + 8);
        !           344:             ADD16(env->regs[R_ESP], 12);
        !           345:         } else {
        !           346:             newip = vm_getw(ssp, sp);
        !           347:             newcs = vm_getw(ssp, sp + 2);
        !           348:             newflags = vm_getw(ssp, sp + 4);
        !           349:             ADD16(env->regs[R_ESP], 6);
        !           350:         }
        !           351:         env->eip = newip;
        !           352:         cpu_x86_load_seg(env, R_CS, newcs);
        !           353:         CHECK_IF_IN_TRAP();
        !           354:         if (data32) {
        !           355:             if (set_vflags_long(newflags, env))
        !           356:                 return;
        !           357:         } else {
        !           358:             if (set_vflags_short(newflags, env))
        !           359:                 return;
        !           360:         }
        !           361:         VM86_FAULT_RETURN;
        !           362:         
        !           363:     case 0xfa: /* cli */
        !           364:         env->eip = ip;
        !           365:         clear_IF(env);
        !           366:         VM86_FAULT_RETURN;
        !           367:         
        !           368:     case 0xfb: /* sti */
        !           369:         env->eip = ip;
        !           370:         if (set_IF(env))
        !           371:             return;
        !           372:         VM86_FAULT_RETURN;
        !           373: 
        !           374:     default:
        !           375:         /* real VM86 GPF exception */
        !           376:         return_to_32bit(env, TARGET_VM86_UNKNOWN);
        !           377:         break;
        !           378:     }
        !           379: }
        !           380: 
        !           381: int do_vm86(CPUX86State *env, long subfunction, 
        !           382:             struct target_vm86plus_struct * target_v86)
        !           383: {
        !           384:     TaskState *ts = env->opaque;
        !           385:     int ret;
        !           386:     
        !           387:     switch (subfunction) {
        !           388:     case TARGET_VM86_REQUEST_IRQ:
        !           389:     case TARGET_VM86_FREE_IRQ:
        !           390:     case TARGET_VM86_GET_IRQ_BITS:
        !           391:     case TARGET_VM86_GET_AND_RESET_IRQ:
        !           392:         gemu_log("qemu: unsupported vm86 subfunction (%ld)\n", subfunction);
        !           393:         ret = -EINVAL;
        !           394:         goto out;
        !           395:     case TARGET_VM86_PLUS_INSTALL_CHECK:
        !           396:         /* NOTE: on old vm86 stuff this will return the error
        !           397:            from verify_area(), because the subfunction is
        !           398:            interpreted as (invalid) address to vm86_struct.
        !           399:            So the installation check works.
        !           400:             */
        !           401:         ret = 0;
        !           402:         goto out;
        !           403:     }
        !           404: 
        !           405:     ts->target_v86 = target_v86;
        !           406:     /* save current CPU regs */
        !           407:     ts->vm86_saved_regs.eax = 0; /* default vm86 syscall return code */
        !           408:     ts->vm86_saved_regs.ebx = env->regs[R_EBX];
        !           409:     ts->vm86_saved_regs.ecx = env->regs[R_ECX];
        !           410:     ts->vm86_saved_regs.edx = env->regs[R_EDX];
        !           411:     ts->vm86_saved_regs.esi = env->regs[R_ESI];
        !           412:     ts->vm86_saved_regs.edi = env->regs[R_EDI];
        !           413:     ts->vm86_saved_regs.ebp = env->regs[R_EBP];
        !           414:     ts->vm86_saved_regs.esp = env->regs[R_ESP];
        !           415:     ts->vm86_saved_regs.eflags = env->eflags;
        !           416:     ts->vm86_saved_regs.eip  = env->eip;
        !           417:     ts->vm86_saved_regs.cs = env->segs[R_CS].selector;
        !           418:     ts->vm86_saved_regs.ss = env->segs[R_SS].selector;
        !           419:     ts->vm86_saved_regs.ds = env->segs[R_DS].selector;
        !           420:     ts->vm86_saved_regs.es = env->segs[R_ES].selector;
        !           421:     ts->vm86_saved_regs.fs = env->segs[R_FS].selector;
        !           422:     ts->vm86_saved_regs.gs = env->segs[R_GS].selector;
        !           423: 
        !           424:     /* build vm86 CPU state */
        !           425:     ts->v86flags = tswap32(target_v86->regs.eflags);
        !           426:     env->eflags = (env->eflags & ~SAFE_MASK) | 
        !           427:         (tswap32(target_v86->regs.eflags) & SAFE_MASK) | VM_MASK;
        !           428: 
        !           429:     ts->vm86plus.cpu_type = tswapl(target_v86->cpu_type);
        !           430:     switch (ts->vm86plus.cpu_type) {
        !           431:     case TARGET_CPU_286:
        !           432:         ts->v86mask = 0;
        !           433:         break;
        !           434:     case TARGET_CPU_386:
        !           435:         ts->v86mask = NT_MASK | IOPL_MASK;
        !           436:         break;
        !           437:     case TARGET_CPU_486:
        !           438:         ts->v86mask = AC_MASK | NT_MASK | IOPL_MASK;
        !           439:         break;
        !           440:     default:
        !           441:         ts->v86mask = ID_MASK | AC_MASK | NT_MASK | IOPL_MASK;
        !           442:         break;
        !           443:     }
        !           444: 
        !           445:     env->regs[R_EBX] = tswap32(target_v86->regs.ebx);
        !           446:     env->regs[R_ECX] = tswap32(target_v86->regs.ecx);
        !           447:     env->regs[R_EDX] = tswap32(target_v86->regs.edx);
        !           448:     env->regs[R_ESI] = tswap32(target_v86->regs.esi);
        !           449:     env->regs[R_EDI] = tswap32(target_v86->regs.edi);
        !           450:     env->regs[R_EBP] = tswap32(target_v86->regs.ebp);
        !           451:     env->regs[R_ESP] = tswap32(target_v86->regs.esp);
        !           452:     env->eip = tswap32(target_v86->regs.eip);
        !           453:     cpu_x86_load_seg(env, R_CS, tswap16(target_v86->regs.cs));
        !           454:     cpu_x86_load_seg(env, R_SS, tswap16(target_v86->regs.ss));
        !           455:     cpu_x86_load_seg(env, R_DS, tswap16(target_v86->regs.ds));
        !           456:     cpu_x86_load_seg(env, R_ES, tswap16(target_v86->regs.es));
        !           457:     cpu_x86_load_seg(env, R_FS, tswap16(target_v86->regs.fs));
        !           458:     cpu_x86_load_seg(env, R_GS, tswap16(target_v86->regs.gs));
        !           459:     ret = tswap32(target_v86->regs.eax); /* eax will be restored at
        !           460:                                             the end of the syscall */
        !           461:     memcpy(&ts->vm86plus.int_revectored, 
        !           462:            &target_v86->int_revectored, 32);
        !           463:     memcpy(&ts->vm86plus.int21_revectored, 
        !           464:            &target_v86->int21_revectored, 32);
        !           465:     ts->vm86plus.vm86plus.flags = tswapl(target_v86->vm86plus.flags);
        !           466:     memcpy(&ts->vm86plus.vm86plus.vm86dbg_intxxtab, 
        !           467:            target_v86->vm86plus.vm86dbg_intxxtab, 32);
        !           468:     
        !           469: #ifdef DEBUG_VM86
        !           470:     fprintf(logfile, "do_vm86: cs:ip=%04x:%04x\n", 
        !           471:             env->segs[R_CS].selector, env->eip);
        !           472: #endif
        !           473:     /* now the virtual CPU is ready for vm86 execution ! */
        !           474:  out:
        !           475:     return ret;
        !           476: }
        !           477: 

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