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  1. /*
  2.  * Copyright (c) 2006 Ondrej Palkovsky
  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 amd64debug
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #include <arch/debugger.h>
  36. #include <console/kconsole.h>
  37. #include <console/cmd.h>
  38. #include <symtab.h>
  39. #include <print.h>
  40. #include <panic.h>
  41. #include <interrupt.h>
  42. #include <arch/asm.h>
  43. #include <arch/cpu.h>
  44. #include <debug.h>
  45. #include <func.h>
  46. #include <smp/ipi.h>
  47.  
  48. typedef struct  {
  49.     uintptr_t address;      /**< Breakpoint address */
  50.     int flags;              /**< Flags regarding breakpoint */
  51.     int counter;            /**< How many times the exception occured */
  52. } bpinfo_t;
  53.  
  54. static bpinfo_t breakpoints[BKPOINTS_MAX];
  55. SPINLOCK_INITIALIZE(bkpoint_lock);
  56.  
  57. static int cmd_print_breakpoints(cmd_arg_t *argv);
  58. static cmd_info_t bkpts_info = {
  59.     .name = "bkpts",
  60.     .description = "Print breakpoint table.",
  61.     .func = cmd_print_breakpoints,
  62.     .argc = 0,
  63. };
  64.  
  65. #ifndef CONFIG_DEBUG_AS_WATCHPOINT
  66.  
  67. static int cmd_del_breakpoint(cmd_arg_t *argv);
  68. static cmd_arg_t del_argv = {
  69.     .type = ARG_TYPE_INT
  70. };
  71. static cmd_info_t delbkpt_info = {
  72.     .name = "delbkpt",
  73.     .description = "delbkpt <number> - Delete breakpoint.",
  74.     .func = cmd_del_breakpoint,
  75.     .argc = 1,
  76.     .argv = &del_argv
  77. };
  78.  
  79. static int cmd_add_breakpoint(cmd_arg_t *argv);
  80. static cmd_arg_t add_argv = {
  81.     .type = ARG_TYPE_INT
  82. };
  83. static cmd_info_t addbkpt_info = {
  84.     .name = "addbkpt",
  85.     .description = "addbkpt <&symbol> - new breakpoint.",
  86.     .func = cmd_add_breakpoint,
  87.     .argc = 1,
  88.     .argv = &add_argv
  89. };
  90.  
  91. static cmd_arg_t addw_argv = {
  92.     .type = ARG_TYPE_INT
  93. };
  94. static cmd_info_t addwatchp_info = {
  95.     .name = "addwatchp",
  96.     .description = "addbwatchp <&symbol> - new write watchpoint.",
  97.     .func = cmd_add_breakpoint,
  98.     .argc = 1,
  99.     .argv = &addw_argv
  100. };
  101.  
  102. #endif
  103.  
  104. /** Print table of active breakpoints */
  105. int cmd_print_breakpoints(cmd_arg_t *argv __attribute__((unused)))
  106. {
  107.     unsigned int i;
  108.     char *symbol;
  109.  
  110. #ifdef __32_BITS__ 
  111.     printf("#  Count Address    In symbol\n");
  112.     printf("-- ----- ---------- ---------\n");
  113. #endif
  114.  
  115. #ifdef __64_BITS__
  116.     printf("#  Count Address            In symbol\n");
  117.     printf("-- ----- ------------------ ---------\n");
  118. #endif
  119.    
  120.     for (i = 0; i < BKPOINTS_MAX; i++)
  121.         if (breakpoints[i].address) {
  122.             symbol = get_symtab_entry(breakpoints[i].address);
  123.  
  124. #ifdef __32_BITS__
  125.             printf("%-2u %-5d %#10zx %s\n", i,
  126.                 breakpoints[i].counter, breakpoints[i].address,
  127.                 symbol);
  128. #endif
  129.  
  130. #ifdef __64_BITS__
  131.             printf("%-2u %-5d %#18zx %s\n", i,
  132.                 breakpoints[i].counter, breakpoints[i].address,
  133.                 symbol);
  134. #endif
  135.  
  136.         }
  137.     return 1;
  138. }
  139.  
  140. /* Setup DR register according to table */
  141. static void setup_dr(int curidx)
  142. {
  143.     unative_t dr7;
  144.     bpinfo_t *cur = &breakpoints[curidx];
  145.     int flags = breakpoints[curidx].flags;
  146.  
  147.     /* Disable breakpoint in DR7 */
  148.     dr7 = read_dr7();
  149.     dr7 &= ~(0x2 << (curidx*2));
  150.  
  151.     if (cur->address) { /* Setup DR register */
  152.         /* Set breakpoint to debug registers */
  153.         switch (curidx) {
  154.         case 0:
  155.             write_dr0(cur->address);
  156.             break;
  157.         case 1:
  158.             write_dr1(cur->address);
  159.             break;
  160.         case 2:
  161.             write_dr2(cur->address);
  162.             break;
  163.         case 3:
  164.             write_dr3(cur->address);
  165.             break;
  166.         }
  167.         /* Set type to requested breakpoint & length*/
  168.         dr7 &= ~ (0x3 << (16 + 4*curidx));
  169.         dr7 &= ~ (0x3 << (18 + 4*curidx));
  170.         if ((flags & BKPOINT_INSTR)) {
  171.             ;
  172.         } else {
  173.        
  174. #ifdef __32_BITS__
  175.             dr7 |= ((unative_t) 0x3) << (18 + 4 * curidx);
  176. #endif
  177.  
  178. #ifdef __64_BITS__
  179.             dr7 |= ((unative_t) 0x2) << (18 + 4 * curidx);
  180. #endif
  181.            
  182.             if ((flags & BKPOINT_WRITE))
  183.                 dr7 |= ((unative_t) 0x1) << (16 + 4 * curidx);
  184.             else if ((flags & BKPOINT_READ_WRITE))
  185.                 dr7 |= ((unative_t) 0x3) << (16 + 4 * curidx);
  186.         }
  187.  
  188.         /* Enable global breakpoint */
  189.         dr7 |= 0x2 << (curidx * 2);
  190.  
  191.         write_dr7(dr7);
  192.        
  193.     }
  194. }
  195.    
  196. /** Enable hardware breakpoint
  197.  *
  198.  * @param where Address of HW breakpoint
  199.  * @param flags Type of breakpoint (EXECUTE, WRITE)
  200.  * @return Debug slot on success, -1 - no available HW breakpoint
  201.  */
  202. int breakpoint_add(const void *where, const int flags, int curidx)
  203. {
  204.     ipl_t ipl;
  205.     int i;
  206.     bpinfo_t *cur;
  207.  
  208.     ASSERT(flags & (BKPOINT_INSTR | BKPOINT_WRITE | BKPOINT_READ_WRITE));
  209.  
  210.     ipl = interrupts_disable();
  211.     spinlock_lock(&bkpoint_lock);
  212.    
  213.     if (curidx == -1) {
  214.         /* Find free space in slots */
  215.         for (i = 0; i < BKPOINTS_MAX; i++)
  216.             if (!breakpoints[i].address) {
  217.                 curidx = i;
  218.                 break;
  219.             }
  220.         if (curidx == -1) {
  221.             /* Too many breakpoints */
  222.             spinlock_unlock(&bkpoint_lock);
  223.             interrupts_restore(ipl);
  224.             return -1;
  225.         }
  226.     }
  227.     cur = &breakpoints[curidx];
  228.  
  229.     cur->address = (uintptr_t) where;
  230.     cur->flags = flags;
  231.     cur->counter = 0;
  232.  
  233.     setup_dr(curidx);
  234.  
  235.     spinlock_unlock(&bkpoint_lock);
  236.     interrupts_restore(ipl);
  237.  
  238.     /* Send IPI */
  239. #ifdef CONFIG_SMP
  240. //  ipi_broadcast(VECTOR_DEBUG_IPI);   
  241. #endif 
  242.  
  243.     return curidx;
  244. }
  245.  
  246. #ifdef amd64
  247. #   define getip(x) ((x)->rip)
  248. #else
  249. #   define getip(x) ((x)->eip)
  250. #endif
  251.  
  252. static void handle_exception(int slot, istate_t *istate)
  253. {
  254.     ASSERT(breakpoints[slot].address);
  255.  
  256.     /* Handle zero checker */
  257.     if (! (breakpoints[slot].flags & BKPOINT_INSTR)) {
  258.         if ((breakpoints[slot].flags & BKPOINT_CHECK_ZERO)) {
  259.             if (*((unative_t *) breakpoints[slot].address) != 0)
  260.                 return;
  261.             printf("*** Found ZERO on address %lx (slot %d) ***\n",
  262.                 breakpoints[slot].address, slot);
  263.         } else {
  264.             printf("Data watchpoint - new data: %lx\n",
  265.                 *((unative_t *) breakpoints[slot].address));
  266.         }
  267.     }
  268.     printf("Reached breakpoint %d:%lx(%s)\n", slot, getip(istate),
  269.         get_symtab_entry(getip(istate)));
  270.     printf("***Type 'exit' to exit kconsole.\n");
  271.     atomic_set(&haltstate,1);
  272.     kconsole((void *) "debug");
  273.     atomic_set(&haltstate,0);
  274. }
  275.  
  276. void breakpoint_del(int slot)
  277. {
  278.     bpinfo_t *cur;
  279.     ipl_t ipl;
  280.  
  281.     ipl = interrupts_disable();
  282.     spinlock_lock(&bkpoint_lock);
  283.  
  284.     cur = &breakpoints[slot];
  285.     if (!cur->address) {
  286.         spinlock_unlock(&bkpoint_lock);
  287.         interrupts_restore(ipl);
  288.         return;
  289.     }
  290.  
  291.     cur->address = NULL;
  292.  
  293.     setup_dr(slot);
  294.  
  295.     spinlock_unlock(&bkpoint_lock);
  296.     interrupts_restore(ipl);
  297. #ifdef CONFIG_SMP
  298. //  ipi_broadcast(VECTOR_DEBUG_IPI);   
  299. #endif
  300. }
  301.  
  302. #ifndef CONFIG_DEBUG_AS_WATCHPOINT
  303.  
  304. /** Remove breakpoint from table */
  305. int cmd_del_breakpoint(cmd_arg_t *argv)
  306. {
  307.     unative_t bpno = argv->intval;
  308.     if (bpno > BKPOINTS_MAX) {
  309.         printf("Invalid breakpoint number.\n");
  310.         return 0;
  311.     }
  312.     breakpoint_del(argv->intval);
  313.     return 1;
  314. }
  315.  
  316. /** Add new breakpoint to table */
  317. static int cmd_add_breakpoint(cmd_arg_t *argv)
  318. {
  319.     int flags;
  320.     int id;
  321.  
  322.     if (argv == &add_argv) {
  323.         flags = BKPOINT_INSTR;
  324.     } else { /* addwatchp */
  325.         flags = BKPOINT_WRITE;
  326.     }
  327.     printf("Adding breakpoint on address: %p\n", argv->intval);
  328.     id = breakpoint_add((void *)argv->intval, flags, -1);
  329.     if (id < 0)
  330.         printf("Add breakpoint failed.\n");
  331.     else
  332.         printf("Added breakpoint %d.\n", id);
  333.    
  334.     return 1;
  335. }
  336. #endif
  337.  
  338. static void debug_exception(int n __attribute__((unused)), istate_t *istate)
  339. {
  340.     unative_t dr6;
  341.     int i;
  342.    
  343.     /* Set RF to restart the instruction  */
  344. #ifdef amd64      
  345.     istate->rflags |= RFLAGS_RF;
  346. #else
  347.     istate->eflags |= EFLAGS_RF;
  348. #endif
  349.  
  350.     dr6 = read_dr6();
  351.     for (i=0; i < BKPOINTS_MAX; i++) {
  352.         if (dr6 & (1 << i)) {
  353.             dr6 &= ~ (1 << i);
  354.             write_dr6(dr6);
  355.            
  356.             handle_exception(i, istate);
  357.         }
  358.     }
  359. }
  360.  
  361. #ifdef CONFIG_SMP
  362. static void
  363. debug_ipi(int n __attribute__((unused)),
  364.     istate_t *istate __attribute__((unused)))
  365. {
  366.     int i;
  367.  
  368.     spinlock_lock(&bkpoint_lock);
  369.     for (i = 0; i < BKPOINTS_MAX; i++)
  370.         setup_dr(i);
  371.     spinlock_unlock(&bkpoint_lock);
  372. }
  373. #endif
  374.  
  375. /** Initialize debugger */
  376. void debugger_init()
  377. {
  378.     int i;
  379.  
  380.     for (i = 0; i < BKPOINTS_MAX; i++)
  381.         breakpoints[i].address = NULL;
  382.    
  383.     cmd_initialize(&bkpts_info);
  384.     if (!cmd_register(&bkpts_info))
  385.         panic("could not register command %s\n", bkpts_info.name);
  386.  
  387. #ifndef CONFIG_DEBUG_AS_WATCHPOINT
  388.     cmd_initialize(&delbkpt_info);
  389.     if (!cmd_register(&delbkpt_info))
  390.         panic("could not register command %s\n", delbkpt_info.name);
  391.  
  392.     cmd_initialize(&addbkpt_info);
  393.     if (!cmd_register(&addbkpt_info))
  394.         panic("could not register command %s\n", addbkpt_info.name);
  395.  
  396.     cmd_initialize(&addwatchp_info);
  397.     if (!cmd_register(&addwatchp_info))
  398.         panic("could not register command %s\n", addwatchp_info.name);
  399. #endif
  400.    
  401.     exc_register(VECTOR_DEBUG, "debugger", debug_exception);
  402. #ifdef CONFIG_SMP
  403.     exc_register(VECTOR_DEBUG_IPI, "debugger_smp", debug_ipi);
  404. #endif
  405. }
  406.  
  407. /** @}
  408.  */
  409.