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

1.1     ! root        1: /*
        !             2:  *  Arm "Angel" semihosting syscalls
        !             3:  * 
        !             4:  *  Copyright (c) 2005 CodeSourcery, LLC. Written by Paul Brook.
        !             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: 
        !            21: #include <sys/types.h>
        !            22: #include <sys/stat.h>
        !            23: #include <fcntl.h>
        !            24: #include <unistd.h>
        !            25: #include <stdlib.h>
        !            26: #include <stdio.h>
        !            27: #include <time.h>
        !            28: 
        !            29: #include "qemu.h"
        !            30: 
        !            31: #define ARM_ANGEL_HEAP_SIZE (128 * 1024 * 1024)
        !            32: 
        !            33: #define SYS_OPEN        0x01
        !            34: #define SYS_CLOSE       0x02
        !            35: #define SYS_WRITEC      0x03
        !            36: #define SYS_WRITE0      0x04
        !            37: #define SYS_WRITE       0x05
        !            38: #define SYS_READ        0x06
        !            39: #define SYS_READC       0x07
        !            40: #define SYS_ISTTY       0x09
        !            41: #define SYS_SEEK        0x0a
        !            42: #define SYS_FLEN        0x0c
        !            43: #define SYS_TMPNAM      0x0d
        !            44: #define SYS_REMOVE      0x0e
        !            45: #define SYS_RENAME      0x0f
        !            46: #define SYS_CLOCK       0x10
        !            47: #define SYS_TIME        0x11
        !            48: #define SYS_SYSTEM      0x12
        !            49: #define SYS_ERRNO       0x13
        !            50: #define SYS_GET_CMDLINE 0x15
        !            51: #define SYS_HEAPINFO    0x16
        !            52: #define SYS_EXIT        0x18
        !            53: 
        !            54: #ifndef O_BINARY
        !            55: #define O_BINARY 0
        !            56: #endif
        !            57: 
        !            58: int open_modeflags[12] = {
        !            59:     O_RDONLY,
        !            60:     O_RDONLY | O_BINARY,
        !            61:     O_RDWR,
        !            62:     O_RDWR | O_BINARY,
        !            63:     O_WRONLY | O_CREAT | O_TRUNC,
        !            64:     O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
        !            65:     O_RDWR | O_CREAT | O_TRUNC,
        !            66:     O_RDWR | O_CREAT | O_TRUNC | O_BINARY,
        !            67:     O_WRONLY | O_CREAT | O_APPEND,
        !            68:     O_WRONLY | O_CREAT | O_APPEND | O_BINARY,
        !            69:     O_RDWR | O_CREAT | O_APPEND,
        !            70:     O_RDWR | O_CREAT | O_APPEND | O_BINARY
        !            71: };
        !            72: 
        !            73: static inline uint32_t set_swi_errno(TaskState *ts, uint32_t code)
        !            74: {
        !            75:   if (code == (uint32_t)-1)
        !            76:       ts->swi_errno = errno;
        !            77:   return code;
        !            78: }
        !            79: 
        !            80: #define ARG(x) tswap32(args[x])
        !            81: uint32_t do_arm_semihosting(CPUState *env)
        !            82: {
        !            83:     uint32_t *args;
        !            84:     char * s;
        !            85:     int nr;
        !            86:     uint32_t ret;
        !            87:     TaskState *ts = env->opaque;
        !            88: 
        !            89:     nr = env->regs[0];
        !            90:     args = (uint32_t *)env->regs[1];
        !            91:     switch (nr) {
        !            92:     case SYS_OPEN:
        !            93:         s = (char *)ARG(0);
        !            94:         if (ARG(1) >= 12)
        !            95:           return (uint32_t)-1;
        !            96:         if (strcmp(s, ":tt") == 0) {
        !            97:             if (ARG(1) < 4)
        !            98:                 return STDIN_FILENO;
        !            99:             else
        !           100:                 return STDOUT_FILENO;
        !           101:         }
        !           102:         return set_swi_errno(ts, open(s, open_modeflags[ARG(1)], 0644));
        !           103:     case SYS_CLOSE:
        !           104:         return set_swi_errno(ts, close(ARG(0)));
        !           105:     case SYS_WRITEC:
        !           106:         /* Write to debug console.  stderr is near enough.  */
        !           107:         return write(STDERR_FILENO, args, 1);
        !           108:     case SYS_WRITE0:
        !           109:         s = (char *)args;
        !           110:         return write(STDERR_FILENO, s, strlen(s));
        !           111:     case SYS_WRITE:
        !           112:         ret = set_swi_errno(ts, write(ARG(0), (void *)ARG(1), ARG(2)));
        !           113:         if (ret == (uint32_t)-1)
        !           114:             return -1;
        !           115:         return ARG(2) - ret;
        !           116:     case SYS_READ:
        !           117:         ret = set_swi_errno(ts, read(ARG(0), (void *)ARG(1), ARG(2)));
        !           118:         if (ret == (uint32_t)-1)
        !           119:             return -1;
        !           120:         return ARG(2) - ret;
        !           121:     case SYS_READC:
        !           122:        /* XXX: Read from debug cosole. Not implemented.  */
        !           123:         return 0;
        !           124:     case SYS_ISTTY:
        !           125:         return isatty(ARG(0));
        !           126:     case SYS_SEEK:
        !           127:         ret = set_swi_errno(ts, lseek(ARG(0), ARG(1), SEEK_SET));
        !           128:        if (ret == (uint32_t)-1)
        !           129:          return -1;
        !           130:        return 0;
        !           131:     case SYS_FLEN:
        !           132:         {
        !           133:             struct stat buf;
        !           134:             ret = set_swi_errno(ts, fstat(ARG(0), &buf));
        !           135:             if (ret == (uint32_t)-1)
        !           136:                 return -1;
        !           137:             return buf.st_size;
        !           138:         }
        !           139:     case SYS_TMPNAM:
        !           140:         /* XXX: Not implemented.  */
        !           141:         return -1;
        !           142:     case SYS_REMOVE:
        !           143:         return set_swi_errno(ts, remove((char *)ARG(0)));
        !           144:     case SYS_RENAME:
        !           145:         return set_swi_errno(ts, rename((char *)ARG(0), (char *)ARG(2)));
        !           146:     case SYS_CLOCK:
        !           147:         return clock() / (CLOCKS_PER_SEC / 100);
        !           148:     case SYS_TIME:
        !           149:         return set_swi_errno(ts, time(NULL));
        !           150:     case SYS_SYSTEM:
        !           151:         return set_swi_errno(ts, system((char *)ARG(0)));
        !           152:     case SYS_ERRNO:
        !           153:         return ts->swi_errno;
        !           154:     case SYS_GET_CMDLINE:
        !           155:         /* XXX: Not implemented.  */
        !           156:         s = (char *)ARG(0);
        !           157:         *s = 0;
        !           158:         return -1;
        !           159:     case SYS_HEAPINFO:
        !           160:         {
        !           161:             uint32_t *ptr;
        !           162:             uint32_t limit;
        !           163: 
        !           164:             /* Some C llibraries assume the heap immediately follows .bss, so
        !           165:                allocate it using sbrk.  */
        !           166:             if (!ts->heap_limit) {
        !           167:                 long ret;
        !           168: 
        !           169:                 ts->heap_base = do_brk(NULL);
        !           170:                 limit = ts->heap_base + ARM_ANGEL_HEAP_SIZE;
        !           171:                 /* Try a big heap, and reduce the size if that fails.  */
        !           172:                 for (;;) {
        !           173:                     ret = do_brk((char *)limit);
        !           174:                     if (ret != -1)
        !           175:                         break;
        !           176:                     limit = (ts->heap_base >> 1) + (limit >> 1);
        !           177:                 }
        !           178:                 ts->heap_limit = limit;
        !           179:             }
        !           180:               
        !           181:             ptr = (uint32_t *)ARG(0);
        !           182:             ptr[0] = tswap32(ts->heap_base);
        !           183:             ptr[1] = tswap32(ts->heap_limit);
        !           184:             ptr[2] = tswap32(ts->stack_base);
        !           185:             ptr[3] = tswap32(0); /* Stack limit.  */
        !           186:             return 0;
        !           187:         }
        !           188:     case SYS_EXIT:
        !           189:         exit(0);
        !           190:     default:
        !           191:         fprintf(stderr, "qemu: Unsupported SemiHosting SWI 0x%02x\n", nr);
        !           192:         cpu_dump_state(env, stderr, fprintf, 0);
        !           193:         abort();
        !           194:     }
        !           195: }
        !           196: 

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