uint32_t do_arm_semihosting(CPUARMState *env)

{

    ARMCPU *cpu = arm_env_get_cpu(env);

    CPUState *cs = CPU(cpu);

    target_ulong args;

    target_ulong arg0, arg1, arg2, arg3;

    char * s;

    int nr;

    uint32_t ret;

    uint32_t len;

#ifdef CONFIG_USER_ONLY

    TaskState *ts = cs->opaque;

#else

    CPUARMState *ts = env;

#endif



    nr = env->regs[0];

    args = env->regs[1];

    switch (nr) {

    case TARGET_SYS_OPEN:

        GET_ARG(0);

        GET_ARG(1);

        GET_ARG(2);

        s = lock_user_string(arg0);

        if (!s) {

            

            return (uint32_t)-1;

        }

        if (arg1 >= 12) {

            unlock_user(s, arg0, 0);

            return (uint32_t)-1;

        }

        if (strcmp(s, ":tt") == 0) {

            int result_fileno = arg1 < 4 ? STDIN_FILENO : STDOUT_FILENO;

            unlock_user(s, arg0, 0);

            return result_fileno;

        }

        if (use_gdb_syscalls()) {

            gdb_do_syscall(arm_semi_cb, "open,%s,%x,1a4", arg0,

                           (int)arg2+1, gdb_open_modeflags[arg1]);

            ret = env->regs[0];

        } else {

            ret = set_swi_errno(ts, open(s, open_modeflags[arg1], 0644));

        }

        unlock_user(s, arg0, 0);

        return ret;

    case TARGET_SYS_CLOSE:

        GET_ARG(0);

        if (use_gdb_syscalls()) {

            gdb_do_syscall(arm_semi_cb, "close,%x", arg0);

            return env->regs[0];

        } else {

            return set_swi_errno(ts, close(arg0));

        }

    case TARGET_SYS_WRITEC:

        {

          char c;



          if (get_user_u8(c, args))

              

              return (uint32_t)-1;

          

          if (use_gdb_syscalls()) {

                gdb_do_syscall(arm_semi_cb, "write,2,%x,1", args);

                return env->regs[0];

          } else {

                return write(STDERR_FILENO, &c, 1);

          }

        }

    case TARGET_SYS_WRITE0:

        if (!(s = lock_user_string(args)))

            

            return (uint32_t)-1;

        len = strlen(s);

        if (use_gdb_syscalls()) {

            gdb_do_syscall(arm_semi_cb, "write,2,%x,%x\n", args, len);

            ret = env->regs[0];

        } else {

            ret = write(STDERR_FILENO, s, len);

        }

        unlock_user(s, args, 0);

        return ret;

    case TARGET_SYS_WRITE:

        GET_ARG(0);

        GET_ARG(1);

        GET_ARG(2);

        len = arg2;

        if (use_gdb_syscalls()) {

            arm_semi_syscall_len = len;

            gdb_do_syscall(arm_semi_cb, "write,%x,%x,%x", arg0, arg1, len);

            return env->regs[0];

        } else {

            s = lock_user(VERIFY_READ, arg1, len, 1);

            if (!s) {

                

                return (uint32_t)-1;

            }

            ret = set_swi_errno(ts, write(arg0, s, len));

            unlock_user(s, arg1, 0);

            if (ret == (uint32_t)-1)

                return -1;

            return len - ret;

        }

    case TARGET_SYS_READ:

        GET_ARG(0);

        GET_ARG(1);

        GET_ARG(2);

        len = arg2;

        if (use_gdb_syscalls()) {

            arm_semi_syscall_len = len;

            gdb_do_syscall(arm_semi_cb, "read,%x,%x,%x", arg0, arg1, len);

            return env->regs[0];

        } else {

            s = lock_user(VERIFY_WRITE, arg1, len, 0);

            if (!s) {

                

                return (uint32_t)-1;

            }

            do {

                ret = set_swi_errno(ts, read(arg0, s, len));

            } while (ret == -1 && errno == EINTR);

            unlock_user(s, arg1, len);

            if (ret == (uint32_t)-1)

                return -1;

            return len - ret;

        }

    case TARGET_SYS_READC:

       

        return 0;

    case TARGET_SYS_ISTTY:

        GET_ARG(0);

        if (use_gdb_syscalls()) {

            gdb_do_syscall(arm_semi_cb, "isatty,%x", arg0);

            return env->regs[0];

        } else {

            return isatty(arg0);

        }

    case TARGET_SYS_SEEK:

        GET_ARG(0);

        GET_ARG(1);

        if (use_gdb_syscalls()) {

            gdb_do_syscall(arm_semi_cb, "lseek,%x,%x,0", arg0, arg1);

            return env->regs[0];

        } else {

            ret = set_swi_errno(ts, lseek(arg0, arg1, SEEK_SET));

            if (ret == (uint32_t)-1)

              return -1;

            return 0;

        }

    case TARGET_SYS_FLEN:

        GET_ARG(0);

        if (use_gdb_syscalls()) {

            gdb_do_syscall(arm_semi_flen_cb, "fstat,%x,%x",

                           arg0, env->regs[13]-64);

            return env->regs[0];

        } else {

            struct stat buf;

            ret = set_swi_errno(ts, fstat(arg0, &buf));

            if (ret == (uint32_t)-1)

                return -1;

            return buf.st_size;

        }

    case TARGET_SYS_TMPNAM:

        

        return -1;

    case TARGET_SYS_REMOVE:

        GET_ARG(0);

        GET_ARG(1);

        if (use_gdb_syscalls()) {

            gdb_do_syscall(arm_semi_cb, "unlink,%s", arg0, (int)arg1+1);

            ret = env->regs[0];

        } else {

            s = lock_user_string(arg0);

            if (!s) {

                

                return (uint32_t)-1;

            }

            ret =  set_swi_errno(ts, remove(s));

            unlock_user(s, arg0, 0);

        }

        return ret;

    case TARGET_SYS_RENAME:

        GET_ARG(0);

        GET_ARG(1);

        GET_ARG(2);

        GET_ARG(3);

        if (use_gdb_syscalls()) {

            gdb_do_syscall(arm_semi_cb, "rename,%s,%s",

                           arg0, (int)arg1+1, arg2, (int)arg3+1);

            return env->regs[0];

        } else {

            char *s2;

            s = lock_user_string(arg0);

            s2 = lock_user_string(arg2);

            if (!s || !s2)

                

                ret = (uint32_t)-1;

            else

                ret = set_swi_errno(ts, rename(s, s2));

            if (s2)

                unlock_user(s2, arg2, 0);

            if (s)

                unlock_user(s, arg0, 0);

            return ret;

        }

    case TARGET_SYS_CLOCK:

        return clock() / (CLOCKS_PER_SEC / 100);

    case TARGET_SYS_TIME:

        return set_swi_errno(ts, time(NULL));

    case TARGET_SYS_SYSTEM:

        GET_ARG(0);

        GET_ARG(1);

        if (use_gdb_syscalls()) {

            gdb_do_syscall(arm_semi_cb, "system,%s", arg0, (int)arg1+1);

            return env->regs[0];

        } else {

            s = lock_user_string(arg0);

            if (!s) {

                

                return (uint32_t)-1;

            }

            ret = set_swi_errno(ts, system(s));

            unlock_user(s, arg0, 0);

            return ret;

        }

    case TARGET_SYS_ERRNO:

#ifdef CONFIG_USER_ONLY

        return ts->swi_errno;

#else

        return syscall_err;

#endif

    case TARGET_SYS_GET_CMDLINE:

        {

            



























            char *output_buffer;

            size_t input_size;

            size_t output_size;

            int status = 0;

            GET_ARG(0);

            GET_ARG(1);

            input_size = arg1;

            

#if !defined(CONFIG_USER_ONLY)

            output_size = strlen(ts->boot_info->kernel_filename)

                        + 1  

                        + strlen(ts->boot_info->kernel_cmdline)

                        + 1; 

#else

            unsigned int i;



            output_size = ts->info->arg_end - ts->info->arg_start;

            if (!output_size) {

                



                output_size = 1;

            }

#endif



            if (output_size > input_size) {

                 

                return -1;

            }



            

            if (SET_ARG(1, output_size - 1)) {

                

                return -1;

            }



            

            output_buffer = lock_user(VERIFY_WRITE, arg0, output_size, 0);

            if (!output_buffer) {

                return -1;

            }



            

#if !defined(CONFIG_USER_ONLY)

            pstrcpy(output_buffer, output_size, ts->boot_info->kernel_filename);

            pstrcat(output_buffer, output_size, " ");

            pstrcat(output_buffer, output_size, ts->boot_info->kernel_cmdline);

#else

            if (output_size == 1) {

                

                output_buffer[0] = '\0';

                goto out;

            }



            if (copy_from_user(output_buffer, ts->info->arg_start,

                               output_size)) {

                status = -1;

                goto out;

            }



            

            for (i = 0; i < output_size - 1; i++) {

                if (output_buffer[i] == 0) {

                    output_buffer[i] = ' ';

                }

            }

        out:

#endif

            

            unlock_user(output_buffer, arg0, output_size);



            return status;

        }

    case TARGET_SYS_HEAPINFO:

        {

            uint32_t *ptr;

            uint32_t limit;

            GET_ARG(0);



#ifdef CONFIG_USER_ONLY

            



            if (!ts->heap_limit) {

                abi_ulong ret;



                ts->heap_base = do_brk(0);

                limit = ts->heap_base + ARM_ANGEL_HEAP_SIZE;

                

                for (;;) {

                    ret = do_brk(limit);

                    if (ret >= limit) {

                        break;

                    }

                    limit = (ts->heap_base >> 1) + (limit >> 1);

                }

                ts->heap_limit = limit;

            }



            ptr = lock_user(VERIFY_WRITE, arg0, 16, 0);

            if (!ptr) {

                

                return (uint32_t)-1;

            }

            ptr[0] = tswap32(ts->heap_base);

            ptr[1] = tswap32(ts->heap_limit);

            ptr[2] = tswap32(ts->stack_base);

            ptr[3] = tswap32(0); 

            unlock_user(ptr, arg0, 16);

#else

            limit = ram_size;

            ptr = lock_user(VERIFY_WRITE, arg0, 16, 0);

            if (!ptr) {

                

                return (uint32_t)-1;

            }

            

            ptr[0] = tswap32(limit / 2);

            ptr[1] = tswap32(limit);

            ptr[2] = tswap32(limit); 

            ptr[3] = tswap32(0); 

            unlock_user(ptr, arg0, 16);

#endif

            return 0;

        }

    case TARGET_SYS_EXIT:

        gdb_exit(env, 0);

        exit(0);

    default:

        fprintf(stderr, "qemu: Unsupported SemiHosting SWI 0x%02x\n", nr);

        cpu_dump_state(cs, stderr, fprintf, 0);

        abort();

    }

}
