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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. static void udebug_receive_stop(call_t *call)
  168. {
  169.     thread_t *t;
  170.     int rc;
  171.  
  172.     klog_printf("debug_stop()");
  173.  
  174.     t = (thread_t *)IPC_GET_ARG2(call->data);
  175.  
  176.     rc = udebug_stop(t, call);
  177.     IPC_SET_RETVAL(call->data, rc);
  178.     ipc_answer(&TASK->kernel_box, call);
  179. }
  180.  
  181. static void udebug_receive_thread_read(call_t *call)
  182. {
  183.     unative_t uspace_addr;
  184.     unative_t to_copy;
  185.     unsigned total_bytes;
  186.     unsigned buf_size;
  187.     void *buffer;
  188.     size_t n;
  189.     int rc;
  190.  
  191.     uspace_addr = IPC_GET_ARG2(call->data); /* Destination address */
  192.     buf_size = IPC_GET_ARG3(call->data);    /* Dest. buffer size */
  193.  
  194.     /*
  195.      * Read thread list. Variable n will be filled with actual number
  196.      * of threads times thread-id size.
  197.      */
  198.     rc = udebug_thread_read(&buffer, buf_size, &n);
  199.     if (rc < 0) {
  200.         IPC_SET_RETVAL(call->data, rc);
  201.         ipc_answer(&TASK->kernel_box, call);
  202.         return;
  203.     }
  204.  
  205.     total_bytes = n;
  206.  
  207.     /* Copy MAX(buf_size, total_bytes) bytes */
  208.  
  209.     if (buf_size > total_bytes)
  210.         to_copy = total_bytes;
  211.     else
  212.         to_copy = buf_size;
  213.  
  214.     /*
  215.      * Make use of call->buffer to transfer data to caller's userspace
  216.      */
  217.  
  218.     IPC_SET_RETVAL(call->data, 0);
  219.     /* ARG1=dest, ARG2=size as in IPC_M_DATA_READ so that
  220.        same code in process_answer() can be used
  221.        (no way to distinguish method in answer) */
  222.     IPC_SET_ARG1(call->data, uspace_addr);
  223.     IPC_SET_ARG2(call->data, to_copy);
  224.  
  225.     IPC_SET_ARG3(call->data, total_bytes);
  226.     call->buffer = buffer;
  227.  
  228.     ipc_answer(&TASK->kernel_box, call);
  229. }
  230.  
  231. static void udebug_receive_args_read(call_t *call)
  232. {
  233.     thread_t *t;
  234.     unative_t uspace_addr;
  235.     int rc;
  236.     void *buffer;
  237.  
  238.     t = (thread_t *)IPC_GET_ARG2(call->data);
  239.  
  240.     rc = udebug_args_read(t, &buffer);
  241.     if (rc != EOK) {
  242.         IPC_SET_RETVAL(call->data, rc);
  243.         ipc_answer(&TASK->kernel_box, call);
  244.         return;
  245.     }
  246.  
  247.     /*
  248.      * Make use of call->buffer to transfer data to caller's userspace
  249.      */
  250.  
  251.     uspace_addr = IPC_GET_ARG3(call->data);
  252.  
  253.     IPC_SET_RETVAL(call->data, 0);
  254.     /* ARG1=dest, ARG2=size as in IPC_M_DATA_READ so that
  255.        same code in process_answer() can be used
  256.        (no way to distinguish method in answer) */
  257.     IPC_SET_ARG1(call->data, uspace_addr);
  258.     IPC_SET_ARG2(call->data, 6 * sizeof(unative_t));
  259.     call->buffer = buffer;
  260.  
  261.     ipc_answer(&TASK->kernel_box, call);
  262. }
  263.  
  264. static void udebug_receive_regs_read(call_t *call)
  265. {
  266.     thread_t *t;
  267.     unative_t uspace_addr;
  268.     unative_t to_copy;
  269.     unative_t buf_size;
  270.     unative_t total_bytes;
  271.     void *buffer;
  272.     int rc;
  273.     size_t n;
  274.  
  275.     klog_printf("debug_regs_read()");
  276.  
  277.     t = (thread_t *) IPC_GET_ARG2(call->data);
  278.  
  279.     rc = udebug_regs_read(t, &buffer, &n);
  280.     if (rc < 0) {
  281.         IPC_SET_RETVAL(call->data, rc);
  282.         ipc_answer(&TASK->kernel_box, call);
  283.         return;
  284.     }
  285.  
  286.     /*
  287.      * Make use of call->buffer to transfer data to caller's userspace
  288.      */
  289.  
  290.     uspace_addr = IPC_GET_ARG3(call->data);
  291.     buf_size = IPC_GET_ARG4(call->data);
  292.  
  293.     total_bytes = n;
  294.  
  295.     if (buf_size > total_bytes)
  296.         to_copy = total_bytes;
  297.     else
  298.         to_copy = buf_size;
  299.  
  300.     IPC_SET_RETVAL(call->data, 0);
  301.     /* ARG1=dest, ARG2=size as in IPC_M_DATA_READ so that
  302.        same code in process_answer() can be used
  303.        (no way to distinguish method in answer) */
  304.     IPC_SET_ARG1(call->data, uspace_addr);
  305.     IPC_SET_ARG2(call->data, to_copy);
  306.  
  307.     IPC_SET_ARG3(call->data, total_bytes);
  308.     call->buffer = buffer;
  309.  
  310.     ipc_answer(&TASK->kernel_box, call);
  311. }
  312.  
  313. static void udebug_receive_regs_write(call_t *call)
  314. {
  315.     thread_t *t;
  316.     void *uspace_data;
  317.     unative_t to_copy;
  318.     int rc;
  319.  
  320.     uspace_data = (void *)IPC_GET_ARG3(call->data);
  321.     to_copy = IPC_GET_ARG4(call->data);
  322.  
  323.     t = (thread_t *) IPC_GET_ARG2(call->data);
  324.  
  325.     rc = udebug_regs_write(t, call->buffer);
  326.     if (rc < 0) {
  327.         IPC_SET_RETVAL(call->data, rc);
  328.         ipc_answer(&TASK->kernel_box, call);
  329.         return;
  330.     }
  331.  
  332.     /* Set answer values */
  333.  
  334.     IPC_SET_ARG1(call->data, to_copy);
  335.     IPC_SET_ARG2(call->data, sizeof(istate_t));
  336.  
  337.     IPC_SET_RETVAL(call->data, 0);
  338.     free(call->buffer);
  339.     call->buffer = NULL;
  340.  
  341.     ipc_answer(&TASK->kernel_box, call);
  342. }
  343.  
  344.  
  345. static void udebug_receive_mem_read(call_t *call)
  346. {
  347.     unative_t uspace_dst;
  348.     unative_t uspace_src;
  349.     unsigned size;
  350.     void *buffer;
  351.     int rc;
  352.  
  353.     uspace_dst = IPC_GET_ARG2(call->data);
  354.     uspace_src = IPC_GET_ARG3(call->data);
  355.     size = IPC_GET_ARG4(call->data);
  356.  
  357.     rc = udebug_mem_read(uspace_src, size, &buffer);
  358.     if (rc < 0) {
  359.         IPC_SET_RETVAL(call->data, rc);
  360.         ipc_answer(&TASK->kernel_box, call);
  361.         return;
  362.     }
  363.  
  364.     IPC_SET_RETVAL(call->data, 0);
  365.     /* ARG1=dest, ARG2=size as in IPC_M_DATA_READ so that
  366.        same code in process_answer() can be used
  367.        (no way to distinguish method in answer) */
  368.     IPC_SET_ARG1(call->data, uspace_dst);
  369.     IPC_SET_ARG2(call->data, size);
  370.     call->buffer = buffer;
  371.  
  372.     ipc_answer(&TASK->kernel_box, call);
  373. }
  374.  
  375. static void udebug_receive_mem_write(call_t *call)
  376. {
  377.     unative_t uspace_dst;
  378.     unsigned size;
  379.     int rc;
  380.  
  381.     klog_printf("udebug_receive_mem_write()");
  382.  
  383.     uspace_dst = IPC_GET_ARG3(call->data);
  384.     size = IPC_GET_ARG4(call->data);
  385.  
  386.     rc = udebug_mem_write(uspace_dst, call->buffer, size);
  387.     if (rc < 0) {
  388.         IPC_SET_RETVAL(call->data, rc);
  389.         ipc_answer(&TASK->kernel_box, call);
  390.         return;
  391.     }
  392.  
  393.     IPC_SET_RETVAL(call->data, 0);
  394.     free(call->buffer);
  395.     call->buffer = NULL;
  396.  
  397.     ipc_answer(&TASK->kernel_box, call);
  398. }
  399.  
  400.  
  401. /**
  402.  * Handle a debug call received on the kernel answerbox.
  403.  *
  404.  * This is called by the kbox servicing thread.
  405.  */
  406. void udebug_call_receive(call_t *call)
  407. {
  408.     int debug_method;
  409.  
  410.     debug_method = IPC_GET_ARG1(call->data);
  411.  
  412.     if (debug_method != UDEBUG_M_BEGIN) {
  413.         /*
  414.          * Verify that the sender is this task's debugger.
  415.          * Note that this is the only thread that could change
  416.          * TASK->debugger. Therefore no locking is necessary
  417.          * and the sender can be safely considered valid until
  418.          * control exits this function.
  419.          */
  420.         if (TASK->debugger != call->sender) {
  421.             IPC_SET_RETVAL(call->data, EINVAL);
  422.             ipc_answer(&TASK->kernel_box, call);
  423.             return;
  424.         }
  425.     }
  426.  
  427.     switch (debug_method) {
  428.     case UDEBUG_M_BEGIN:
  429.         udebug_receive_begin(call);
  430.         break;
  431.     case UDEBUG_M_END:
  432.         udebug_receive_end(call);
  433.         break;
  434.     case UDEBUG_M_GO:
  435.         udebug_receive_go(call);
  436.         break;
  437.     case UDEBUG_M_STOP:
  438.         udebug_receive_stop(call);
  439.         break;
  440.     case UDEBUG_M_THREAD_READ:
  441.         udebug_receive_thread_read(call);
  442.         break;
  443.     case UDEBUG_M_ARGS_READ:
  444.         udebug_receive_args_read(call);
  445.         break;
  446.     case UDEBUG_M_REGS_READ:
  447.         udebug_receive_regs_read(call);
  448.         break;
  449.     case UDEBUG_M_REGS_WRITE:
  450.         udebug_receive_regs_write(call);
  451.         break;
  452.     case UDEBUG_M_MEM_READ:
  453.         udebug_receive_mem_read(call);
  454.         break;
  455.     case UDEBUG_M_MEM_WRITE:
  456.         udebug_receive_mem_write(call);
  457.         break;
  458.     }
  459. }
  460.  
  461. /** @}
  462.  */
  463.