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  1. /*
  2.  * Copyright (c) 2008 Jiri Svoboda
  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
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup generic
  30.  * @{
  31.  */
  32.  
  33. /**
  34.  * @file
  35.  * @brief   Udebug IPC message handling.
  36.  */
  37.  
  38. #include <console/klog.h>
  39. #include <proc/task.h>
  40. #include <proc/thread.h>
  41. #include <arch.h>
  42. #include <errno.h>
  43. #include <ipc/ipc.h>
  44. #include <syscall/copy.h>
  45. #include <udebug/udebug.h>
  46. #include <udebug/udebug_ops.h>
  47. #include <udebug/udebug_ipc.h>
  48.  
  49. static int udebug_rp_regs_write(call_t *call, phone_t *phone)
  50. {
  51.     void *uspace_data;
  52.     unative_t to_copy;
  53.     int rc;
  54.     void *buffer;
  55.  
  56.     klog_printf("debug_regs_write()");
  57.  
  58.     uspace_data = (void *)IPC_GET_ARG3(call->data);
  59.     to_copy = IPC_GET_ARG4(call->data);
  60.     if (to_copy > sizeof(istate_t)) to_copy = sizeof(istate_t);
  61.  
  62.     buffer = malloc(to_copy, 0);
  63.     if (!buffer) return ENOMEM;
  64.  
  65.     rc = copy_from_uspace(buffer, uspace_data, to_copy);
  66.     if (rc != 0) {
  67.         klog_printf("debug_regs_write() - copy failed");
  68.         return rc;
  69.     }
  70.  
  71.     call->buffer = buffer;
  72.  
  73.     klog_printf(" - done");
  74.     return 0;
  75. }
  76.  
  77. static int udebug_rp_mem_write(call_t *call, phone_t *phone)
  78. {
  79.     void *uspace_data;
  80.     unative_t to_copy;
  81.     int rc;
  82.     void *buffer;
  83.  
  84.     klog_printf("udebug_rp_mem_write()");
  85.  
  86.     uspace_data = (void *)IPC_GET_ARG2(call->data);
  87.     to_copy = IPC_GET_ARG4(call->data);
  88.  
  89.     buffer = malloc(to_copy, 0);
  90.     if (!buffer) return ENOMEM;
  91.  
  92.     rc = copy_from_uspace(buffer, uspace_data, to_copy);
  93.     if (rc != 0) {
  94.         klog_printf(" - copy failed");
  95.         return rc;
  96.     }
  97.  
  98.     call->buffer = buffer;
  99.  
  100.     klog_printf(" - done");
  101.     return 0;
  102. }
  103.  
  104.  
  105. int udebug_request_preprocess(call_t *call, phone_t *phone)
  106. {
  107.     int rc;
  108.  
  109.     switch (IPC_GET_ARG1(call->data)) {
  110.     case UDEBUG_M_REGS_WRITE:
  111.         rc = udebug_rp_regs_write(call, phone);
  112.         return rc;
  113.     case UDEBUG_M_MEM_WRITE:
  114.         rc = udebug_rp_mem_write(call, phone);
  115.         return rc;
  116.     default:
  117.         break;
  118.     }
  119.  
  120.     return 0;
  121. }
  122.  
  123. static void udebug_receive_begin(call_t *call)
  124. {
  125.     int rc;
  126.  
  127.     rc = udebug_begin(call);
  128.     if (rc < 0) {
  129.         IPC_SET_RETVAL(call->data, rc);
  130.         ipc_answer(&TASK->kernel_box, call);
  131.         return;
  132.     }
  133.  
  134.     if (rc != 0) {
  135.         IPC_SET_RETVAL(call->data, 0);
  136.         ipc_answer(&TASK->kernel_box, call);
  137.     }
  138. }
  139.  
  140. static void udebug_receive_end(call_t *call)
  141. {
  142.     int rc;
  143.  
  144.     rc = udebug_end();
  145.  
  146.     IPC_SET_RETVAL(call->data, rc);
  147.     ipc_answer(&TASK->kernel_box, call);
  148. }
  149.  
  150. static void udebug_receive_go(call_t *call)
  151. {
  152.     thread_t *t;
  153.     int rc;
  154.  
  155.     klog_printf("debug_go()");
  156.  
  157.     t = (thread_t *)IPC_GET_ARG2(call->data);
  158.  
  159.     rc = udebug_go(t, call);
  160.     if (rc < 0) {
  161.         IPC_SET_RETVAL(call->data, rc);
  162.         ipc_answer(&TASK->kernel_box, call);
  163.         return;
  164.     }
  165. }
  166.  
  167.  
  168. static void udebug_receive_thread_read(call_t *call)
  169. {
  170.     unative_t uspace_addr;
  171.     unative_t to_copy;
  172.     unsigned total_bytes;
  173.     unsigned buf_size;
  174.     void *buffer;
  175.     size_t n;
  176.     int rc;
  177.  
  178.     uspace_addr = IPC_GET_ARG2(call->data); /* Destination address */
  179.     buf_size = IPC_GET_ARG3(call->data);    /* Dest. buffer size */
  180.  
  181.     /*
  182.      * Read thread list. Variable n will be filled with actual number
  183.      * of threads times thread-id size.
  184.      */
  185.     rc = udebug_thread_read(&buffer, buf_size, &n);
  186.     if (rc < 0) {
  187.         IPC_SET_RETVAL(call->data, rc);
  188.         ipc_answer(&TASK->kernel_box, call);
  189.         return;
  190.     }
  191.  
  192.     total_bytes = n;
  193.  
  194.     /* Copy MAX(buf_size, total_bytes) bytes */
  195.  
  196.     if (buf_size > total_bytes)
  197.         to_copy = total_bytes;
  198.     else
  199.         to_copy = buf_size;
  200.  
  201.     /*
  202.      * Make use of call->buffer to transfer data to caller's userspace
  203.      */
  204.  
  205.     IPC_SET_RETVAL(call->data, 0);
  206.     /* ARG1=dest, ARG2=size as in IPC_M_DATA_READ so that
  207.        same code in process_answer() can be used
  208.        (no way to distinguish method in answer) */
  209.     IPC_SET_ARG1(call->data, uspace_addr);
  210.     IPC_SET_ARG2(call->data, to_copy);
  211.  
  212.     IPC_SET_ARG3(call->data, total_bytes);
  213.     call->buffer = buffer;
  214.  
  215.     ipc_answer(&TASK->kernel_box, call);
  216. }
  217.  
  218. static void udebug_receive_args_read(call_t *call)
  219. {
  220.     thread_t *t;
  221.     unative_t uspace_addr;
  222.     int rc;
  223.     void *buffer;
  224.  
  225.     t = (thread_t *)IPC_GET_ARG2(call->data);
  226.  
  227.     rc = udebug_args_read(t, &buffer);
  228.     if (rc != EOK) {
  229.         IPC_SET_RETVAL(call->data, rc);
  230.         ipc_answer(&TASK->kernel_box, call);
  231.         return;
  232.     }
  233.  
  234.     /*
  235.      * Make use of call->buffer to transfer data to caller's userspace
  236.      */
  237.  
  238.     uspace_addr = IPC_GET_ARG3(call->data);
  239.  
  240.     IPC_SET_RETVAL(call->data, 0);
  241.     /* ARG1=dest, ARG2=size as in IPC_M_DATA_READ so that
  242.        same code in process_answer() can be used
  243.        (no way to distinguish method in answer) */
  244.     IPC_SET_ARG1(call->data, uspace_addr);
  245.     IPC_SET_ARG2(call->data, 6 * sizeof(unative_t));
  246.     call->buffer = buffer;
  247.  
  248.     ipc_answer(&TASK->kernel_box, call);
  249. }
  250.  
  251. static void udebug_receive_regs_read(call_t *call)
  252. {
  253.     thread_t *t;
  254.     unative_t uspace_addr;
  255.     unative_t to_copy;
  256.     unative_t buf_size;
  257.     unative_t total_bytes;
  258.     void *buffer;
  259.     int rc;
  260.     size_t n;
  261.  
  262.     klog_printf("debug_regs_read()");
  263.  
  264.     t = (thread_t *) IPC_GET_ARG2(call->data);
  265.  
  266.     rc = udebug_regs_read(t, &buffer, &n);
  267.     if (rc < 0) {
  268.         IPC_SET_RETVAL(call->data, rc);
  269.         ipc_answer(&TASK->kernel_box, call);
  270.         return;
  271.     }
  272.  
  273.     /*
  274.      * Make use of call->buffer to transfer data to caller's userspace
  275.      */
  276.  
  277.     uspace_addr = IPC_GET_ARG3(call->data);
  278.     buf_size = IPC_GET_ARG4(call->data);
  279.  
  280.     total_bytes = n;
  281.  
  282.     if (buf_size > total_bytes)
  283.         to_copy = total_bytes;
  284.     else
  285.         to_copy = buf_size;
  286.  
  287.     IPC_SET_RETVAL(call->data, 0);
  288.     /* ARG1=dest, ARG2=size as in IPC_M_DATA_READ so that
  289.        same code in process_answer() can be used
  290.        (no way to distinguish method in answer) */
  291.     IPC_SET_ARG1(call->data, uspace_addr);
  292.     IPC_SET_ARG2(call->data, to_copy);
  293.  
  294.     IPC_SET_ARG3(call->data, total_bytes);
  295.     call->buffer = buffer;
  296.  
  297.     ipc_answer(&TASK->kernel_box, call);
  298. }
  299.  
  300. static void udebug_receive_regs_write(call_t *call)
  301. {
  302.     thread_t *t;
  303.     void *uspace_data;
  304.     unative_t to_copy;
  305.     int rc;
  306.  
  307.     uspace_data = (void *)IPC_GET_ARG3(call->data);
  308.     to_copy = IPC_GET_ARG4(call->data);
  309.  
  310.     t = (thread_t *) IPC_GET_ARG2(call->data);
  311.  
  312.     rc = udebug_regs_write(t, call->buffer);
  313.     if (rc < 0) {
  314.         IPC_SET_RETVAL(call->data, rc);
  315.         ipc_answer(&TASK->kernel_box, call);
  316.         return;
  317.     }
  318.  
  319.     /* Set answer values */
  320.  
  321.     IPC_SET_ARG1(call->data, to_copy);
  322.     IPC_SET_ARG2(call->data, sizeof(istate_t));
  323.  
  324.     IPC_SET_RETVAL(call->data, 0);
  325.     free(call->buffer);
  326.     call->buffer = NULL;
  327.  
  328.     ipc_answer(&TASK->kernel_box, call);
  329. }
  330.  
  331.  
  332. static void udebug_receive_mem_read(call_t *call)
  333. {
  334.     unative_t uspace_dst;
  335.     unative_t uspace_src;
  336.     unsigned size;
  337.     void *buffer;
  338.     int rc;
  339.  
  340.     uspace_dst = IPC_GET_ARG2(call->data);
  341.     uspace_src = IPC_GET_ARG3(call->data);
  342.     size = IPC_GET_ARG4(call->data);
  343.  
  344.     rc = udebug_mem_read(uspace_src, size, &buffer);
  345.     if (rc < 0) {
  346.         IPC_SET_RETVAL(call->data, rc);
  347.         ipc_answer(&TASK->kernel_box, call);
  348.         return;
  349.     }
  350.  
  351.     IPC_SET_RETVAL(call->data, 0);
  352.     /* ARG1=dest, ARG2=size as in IPC_M_DATA_READ so that
  353.        same code in process_answer() can be used
  354.        (no way to distinguish method in answer) */
  355.     IPC_SET_ARG1(call->data, uspace_dst);
  356.     IPC_SET_ARG2(call->data, size);
  357.     call->buffer = buffer;
  358.  
  359.     ipc_answer(&TASK->kernel_box, call);
  360. }
  361.  
  362. static void udebug_receive_mem_write(call_t *call)
  363. {
  364.     unative_t uspace_dst;
  365.     unsigned size;
  366.     int rc;
  367.  
  368.     klog_printf("udebug_receive_mem_write()");
  369.  
  370.     uspace_dst = IPC_GET_ARG3(call->data);
  371.     size = IPC_GET_ARG4(call->data);
  372.  
  373.     rc = udebug_mem_write(uspace_dst, call->buffer, size);
  374.     if (rc < 0) {
  375.         IPC_SET_RETVAL(call->data, rc);
  376.         ipc_answer(&TASK->kernel_box, call);
  377.         return;
  378.     }
  379.  
  380.     IPC_SET_RETVAL(call->data, 0);
  381.     free(call->buffer);
  382.     call->buffer = NULL;
  383.  
  384.     ipc_answer(&TASK->kernel_box, call);
  385. }
  386.  
  387.  
  388. /**
  389.  * Handle a debug call received on the kernel answerbox.
  390.  *
  391.  * This is called by the kbox servicing thread.
  392.  */
  393. void udebug_call_receive(call_t *call)
  394. {
  395.     int debug_method;
  396.  
  397.     debug_method = IPC_GET_ARG1(call->data);
  398.  
  399.     if (debug_method != UDEBUG_M_BEGIN) {
  400.         /*
  401.          * Verify that the sender is this task's debugger.
  402.          * Note that this is the only thread that could change
  403.          * TASK->debugger. Therefore no locking is necessary
  404.          * and the sender can be safely considered valid until
  405.          * control exits this function.
  406.          */
  407.         if (TASK->debugger != call->sender) {
  408.             IPC_SET_RETVAL(call->data, EINVAL);
  409.             ipc_answer(&TASK->kernel_box, call);
  410.             return;
  411.         }
  412.     }
  413.  
  414.     switch (debug_method) {
  415.     case UDEBUG_M_BEGIN:
  416.         udebug_receive_begin(call);
  417.         break;
  418.     case UDEBUG_M_END:
  419.         udebug_receive_end(call);
  420.         break;
  421.     case UDEBUG_M_GO:
  422.         udebug_receive_go(call);
  423.         break;
  424.     case UDEBUG_M_THREAD_READ:
  425.         udebug_receive_thread_read(call);
  426.         break;
  427.     case UDEBUG_M_ARGS_READ:
  428.         udebug_receive_args_read(call);
  429.         break;
  430.     case UDEBUG_M_REGS_READ:
  431.         udebug_receive_regs_read(call);
  432.         break;
  433.     case UDEBUG_M_REGS_WRITE:
  434.         udebug_receive_regs_write(call);
  435.         break;
  436.     case UDEBUG_M_MEM_READ:
  437.         udebug_receive_mem_read(call);
  438.         break;
  439.     case UDEBUG_M_MEM_WRITE:
  440.         udebug_receive_mem_write(call);
  441.         break;
  442.     }
  443. }
  444.  
  445. /** @}
  446.  */
  447.