xtensa-semi.c

   1 /*
   2  * Copyright (c) 2011, Max Filippov, Open Source and Linux Lab.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are met:
   7  *     * Redistributions of source code must retain the above copyright
   8  *       notice, this list of conditions and the following disclaimer.
   9  *     * Redistributions in binary form must reproduce the above copyright
  10  *       notice, this list of conditions and the following disclaimer in the
  11  *       documentation and/or other materials provided with the distribution.
  12  *     * Neither the name of the Open Source and Linux Lab nor the
  13  *       names of its contributors may be used to endorse or promote products
  14  *       derived from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  17  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  20  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  21  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  22  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  23  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  25  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #include <errno.h>
  29 #include <unistd.h>
  30 #include <string.h>
  31 #include <stddef.h>
  32 #include "cpu.h"
  33 #include "dyngen-exec.h"
  34 #include "helper.h"
  35 #include "qemu-log.h"
  36
  37 enum {
  38     TARGET_SYS_exit = 1,
  39     TARGET_SYS_read = 3,
  40     TARGET_SYS_write = 4,
  41     TARGET_SYS_open = 5,
  42     TARGET_SYS_close = 6,
  43     TARGET_SYS_lseek = 19,
  44     TARGET_SYS_select_one = 29,
  45
  46     TARGET_SYS_argc = 1000,
  47     TARGET_SYS_argv_sz = 1001,
  48     TARGET_SYS_argv = 1002,
  49     TARGET_SYS_memset = 1004,
  50 };
  51
  52 enum {
  53     SELECT_ONE_READ   = 1,
  54     SELECT_ONE_WRITE  = 2,
  55     SELECT_ONE_EXCEPT = 3,
  56 };
  57
  58 void HELPER(simcall)(CPUXtensaState *env)
  59 {
  60     uint32_t *regs = env->regs;
  61
  62     switch (regs[2]) {
  63     case TARGET_SYS_exit:
  64         qemu_log("exit(%d) simcall\n", regs[3]);
  65         exit(regs[3]);
  66         break;
  67
  68     case TARGET_SYS_read:
  69     case TARGET_SYS_write:
  70         {
  71             bool is_write = regs[2] == TARGET_SYS_write;
  72             uint32_t fd = regs[3];
  73             uint32_t vaddr = regs[4];
  74             uint32_t len = regs[5];
  75
  76             while (len > 0) {
  77                 target_phys_addr_t paddr =
  78                     cpu_get_phys_page_debug(env, vaddr);
  79                 uint32_t page_left =
  80                     TARGET_PAGE_SIZE - (vaddr & (TARGET_PAGE_SIZE - 1));
  81                 uint32_t io_sz = page_left < len ? page_left : len;
  82                 target_phys_addr_t sz = io_sz;
  83                 void *buf = cpu_physical_memory_map(paddr, &sz, is_write);
  84
  85                 if (buf) {
  86                     vaddr += io_sz;
  87                     len -= io_sz;
  88                     regs[2] = is_write ?
  89                         write(fd, buf, io_sz) :
  90                         read(fd, buf, io_sz);
  91                     regs[3] = errno;
  92                     cpu_physical_memory_unmap(buf, sz, is_write, sz);
  93                     if (regs[2] == -1) {
  94                         break;
  95                     }
  96                 } else {
  97                     regs[2] = -1;
  98                     regs[3] = EINVAL;
  99                     break;
 100                 }
 101             }
 102         }
 103         break;
 104
 105     case TARGET_SYS_open:
 106         {
 107             char name[1024];
 108             int rc;
 109             int i;
 110
 111             for (i = 0; i < ARRAY_SIZE(name); ++i) {
 112                 rc = cpu_memory_rw_debug(
 113                         env, regs[3] + i, (uint8_t *)name + i, 1, 0);
 114                 if (rc != 0 || name[i] == 0) {
 115                     break;
 116                 }
 117             }
 118
 119             if (rc == 0 && i < ARRAY_SIZE(name)) {
 120                 regs[2] = open(name, regs[4], regs[5]);
 121                 regs[3] = errno;
 122             } else {
 123                 regs[2] = -1;
 124                 regs[3] = EINVAL;
 125             }
 126         }
 127         break;
 128
 129     case TARGET_SYS_close:
 130         if (regs[3] < 3) {
 131             regs[2] = regs[3] = 0;
 132         } else {
 133             regs[2] = close(regs[3]);
 134             regs[3] = errno;
 135         }
 136         break;
 137
 138     case TARGET_SYS_lseek:
 139         regs[2] = lseek(regs[3], (off_t)(int32_t)regs[4], regs[5]);
 140         regs[3] = errno;
 141         break;
 142
 143     case TARGET_SYS_select_one:
 144         {
 145             uint32_t fd = regs[3];
 146             uint32_t rq = regs[4];
 147             uint32_t target_tv = regs[5];
 148             uint32_t target_tvv[2];
 149
 150             struct timeval tv = {0};
 151             fd_set fdset;
 152
 153             FD_ZERO(&fdset);
 154             FD_SET(fd, &fdset);
 155
 156             if (target_tv) {
 157                 cpu_memory_rw_debug(env, target_tv,
 158                         (uint8_t *)target_tvv, sizeof(target_tvv), 0);
 159                 tv.tv_sec = (int32_t)tswap32(target_tvv[0]);
 160                 tv.tv_usec = (int32_t)tswap32(target_tvv[1]);
 161             }
 162             regs[2] = select(fd + 1,
 163                     rq == SELECT_ONE_READ   ? &fdset : NULL,
 164                     rq == SELECT_ONE_WRITE  ? &fdset : NULL,
 165                     rq == SELECT_ONE_EXCEPT ? &fdset : NULL,
 166                     target_tv ? &tv : NULL);
 167             regs[3] = errno;
 168         }
 169         break;
 170
 171     case TARGET_SYS_argc:
 172         regs[2] = 1;
 173         regs[3] = 0;
 174         break;
 175
 176     case TARGET_SYS_argv_sz:
 177         regs[2] = 128;
 178         regs[3] = 0;
 179         break;
 180
 181     case TARGET_SYS_argv:
 182         {
 183             struct Argv {
 184                 uint32_t argptr[2];
 185                 char text[120];
 186             } argv = {
 187                 {0, 0},
 188                 "test"
 189             };
 190
 191             argv.argptr[0] = tswap32(regs[3] + offsetof(struct Argv, text));
 192             cpu_memory_rw_debug(
 193                     env, regs[3], (uint8_t *)&argv, sizeof(argv), 1);
 194         }
 195         break;
 196
 197     case TARGET_SYS_memset:
 198         {
 199             uint32_t base = regs[3];
 200             uint32_t sz = regs[5];
 201
 202             while (sz) {
 203                 target_phys_addr_t len = sz;
 204                 void *buf = cpu_physical_memory_map(base, &len, 1);
 205
 206                 if (buf && len) {
 207                     memset(buf, regs[4], len);
 208                     cpu_physical_memory_unmap(buf, len, 1, len);
 209                 } else {
 210                     len = 1;
 211                 }
 212                 base += len;
 213                 sz -= len;
 214             }
 215             regs[2] = regs[3];
 216             regs[3] = 0;
 217         }
 218         break;
 219
 220     default:
 221         qemu_log("%s(%d): not implemented\n", __func__, regs[2]);
 222         break;
 223     }
 224 }