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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.     int i;
  108.     char *symbol;
  109.  
  110.     printf("Breakpoint table.\n");
  111.     for (i=0; i < BKPOINTS_MAX; i++)
  112.         if (breakpoints[i].address) {
  113.             symbol = get_symtab_entry(breakpoints[i].address);
  114.             printf("%d. %lx in %s\n", i,
  115.                    breakpoints[i].address, symbol);
  116.             printf("     Count(%d) ", breakpoints[i].counter);
  117.             printf("\n");
  118.         }
  119.     return 1;
  120. }
  121.  
  122. /* Setup DR register according to table */
  123. static void setup_dr(int curidx)
  124. {
  125.     unative_t dr7;
  126.     bpinfo_t *cur = &breakpoints[curidx];
  127.     int flags = breakpoints[curidx].flags;
  128.  
  129.     /* Disable breakpoint in DR7 */
  130.     dr7 = read_dr7();
  131.     dr7 &= ~(0x2 << (curidx*2));
  132.  
  133.     if (cur->address) { /* Setup DR register */
  134.         /* Set breakpoint to debug registers */
  135.         switch (curidx) {
  136.         case 0:
  137.             write_dr0(cur->address);
  138.             break;
  139.         case 1:
  140.             write_dr1(cur->address);
  141.             break;
  142.         case 2:
  143.             write_dr2(cur->address);
  144.             break;
  145.         case 3:
  146.             write_dr3(cur->address);
  147.             break;
  148.         }
  149.         /* Set type to requested breakpoint & length*/
  150.         dr7 &= ~ (0x3 << (16 + 4*curidx));
  151.         dr7 &= ~ (0x3 << (18 + 4*curidx));
  152.         if ((flags & BKPOINT_INSTR)) {
  153.             ;
  154.         } else {
  155.             if (sizeof(int) == 4)
  156.                 dr7 |= ((unative_t) 0x3) << (18 + 4*curidx);
  157.             else /* 8 */
  158.                 dr7 |= ((unative_t) 0x2) << (18 + 4*curidx);
  159.            
  160.             if ((flags & BKPOINT_WRITE))
  161.                 dr7 |= ((unative_t) 0x1) << (16 + 4*curidx);
  162.             else if ((flags & BKPOINT_READ_WRITE))
  163.                 dr7 |= ((unative_t) 0x3) << (16 + 4*curidx);
  164.         }
  165.  
  166.         /* Enable global breakpoint */
  167.         dr7 |= 0x2 << (curidx*2);
  168.  
  169.         write_dr7(dr7);
  170.        
  171.     }
  172. }
  173.    
  174. /** Enable hardware breakpoint
  175.  *
  176.  * @param where Address of HW breakpoint
  177.  * @param flags Type of breakpoint (EXECUTE, WRITE)
  178.  * @return Debug slot on success, -1 - no available HW breakpoint
  179.  */
  180. int breakpoint_add(const void *where, const int flags, int curidx)
  181. {
  182.     ipl_t ipl;
  183.     int i;
  184.     bpinfo_t *cur;
  185.  
  186.     ASSERT(flags & (BKPOINT_INSTR | BKPOINT_WRITE | BKPOINT_READ_WRITE));
  187.  
  188.     ipl = interrupts_disable();
  189.     spinlock_lock(&bkpoint_lock);
  190.    
  191.     if (curidx == -1) {
  192.         /* Find free space in slots */
  193.         for (i = 0; i < BKPOINTS_MAX; i++)
  194.             if (!breakpoints[i].address) {
  195.                 curidx = i;
  196.                 break;
  197.             }
  198.         if (curidx == -1) {
  199.             /* Too many breakpoints */
  200.             spinlock_unlock(&bkpoint_lock);
  201.             interrupts_restore(ipl);
  202.             return -1;
  203.         }
  204.     }
  205.     cur = &breakpoints[curidx];
  206.  
  207.     cur->address = (uintptr_t) where;
  208.     cur->flags = flags;
  209.     cur->counter = 0;
  210.  
  211.     setup_dr(curidx);
  212.  
  213.     spinlock_unlock(&bkpoint_lock);
  214.     interrupts_restore(ipl);
  215.  
  216.     /* Send IPI */
  217. #ifdef CONFIG_SMP
  218. //  ipi_broadcast(VECTOR_DEBUG_IPI);   
  219. #endif 
  220.  
  221.     return curidx;
  222. }
  223.  
  224. #ifdef amd64
  225. #   define getip(x) ((x)->rip)
  226. #else
  227. #   define getip(x) ((x)->eip)
  228. #endif
  229.  
  230. static void handle_exception(int slot, istate_t *istate)
  231. {
  232.     ASSERT(breakpoints[slot].address);
  233.  
  234.     /* Handle zero checker */
  235.     if (! (breakpoints[slot].flags & BKPOINT_INSTR)) {
  236.         if ((breakpoints[slot].flags & BKPOINT_CHECK_ZERO)) {
  237.             if (*((unative_t *) breakpoints[slot].address) != 0)
  238.                 return;
  239.             printf("**** Found ZERO on address %lx (slot %d) ****\n",
  240.                 breakpoints[slot].address, slot);
  241.         } else {
  242.             printf("Data watchpoint - new data: %lx\n",
  243.                    *((unative_t *) breakpoints[slot].address));
  244.         }
  245.     }
  246.     printf("Reached breakpoint %d:%lx(%s)\n", slot, getip(istate),
  247.            get_symtab_entry(getip(istate)));
  248.     printf("***Type 'exit' to exit kconsole.\n");
  249.     atomic_set(&haltstate,1);
  250.     kconsole((void *) "debug");
  251.     atomic_set(&haltstate,0);
  252. }
  253.  
  254. void breakpoint_del(int slot)
  255. {
  256.     bpinfo_t *cur;
  257.     ipl_t ipl;
  258.  
  259.     ipl = interrupts_disable();
  260.     spinlock_lock(&bkpoint_lock);
  261.  
  262.     cur = &breakpoints[slot];
  263.     if (!cur->address) {
  264.         spinlock_unlock(&bkpoint_lock);
  265.         interrupts_restore(ipl);
  266.         return;
  267.     }
  268.  
  269.     cur->address = NULL;
  270.  
  271.     setup_dr(slot);
  272.  
  273.     spinlock_unlock(&bkpoint_lock);
  274.     interrupts_restore(ipl);
  275. #ifdef CONFIG_SMP
  276. //  ipi_broadcast(VECTOR_DEBUG_IPI);   
  277. #endif
  278. }
  279.  
  280. #ifndef CONFIG_DEBUG_AS_WATCHPOINT
  281.  
  282. /** Remove breakpoint from table */
  283. int cmd_del_breakpoint(cmd_arg_t *argv)
  284. {
  285.     if (argv->intval < 0 || argv->intval > BKPOINTS_MAX) {
  286.         printf("Invalid breakpoint number.\n");
  287.         return 0;
  288.     }
  289.     breakpoint_del(argv->intval);
  290.     return 1;
  291. }
  292.  
  293. /** Add new breakpoint to table */
  294. static int cmd_add_breakpoint(cmd_arg_t *argv)
  295. {
  296.     int flags;
  297.     int id;
  298.  
  299.     if (argv == &add_argv) {
  300.         flags = BKPOINT_INSTR;
  301.     } else { /* addwatchp */
  302.         flags = BKPOINT_WRITE;
  303.     }
  304.     printf("Adding breakpoint on address: %p\n", argv->intval);
  305.     id = breakpoint_add((void *)argv->intval, flags, -1);
  306.     if (id < 0)
  307.         printf("Add breakpoint failed.\n");
  308.     else
  309.         printf("Added breakpoint %d.\n", id);
  310.    
  311.     return 1;
  312. }
  313. #endif
  314.  
  315. static void debug_exception(int n __attribute__((unused)), istate_t *istate)
  316. {
  317.     unative_t dr6;
  318.     int i;
  319.    
  320.     /* Set RF to restart the instruction  */
  321. #ifdef amd64      
  322.     istate->rflags |= RFLAGS_RF;
  323. #else
  324.     istate->eflags |= EFLAGS_RF;
  325. #endif
  326.  
  327.     dr6 = read_dr6();
  328.     for (i=0; i < BKPOINTS_MAX; i++) {
  329.         if (dr6 & (1 << i)) {
  330.             dr6 &= ~ (1 << i);
  331.             write_dr6(dr6);
  332.            
  333.             handle_exception(i, istate);
  334.         }
  335.     }
  336. }
  337.  
  338. #ifdef CONFIG_SMP
  339. static void debug_ipi(int n __attribute__((unused)), istate_t *istate __attribute__((unused)))
  340. {
  341.     int i;
  342.  
  343.     spinlock_lock(&bkpoint_lock);
  344.     for (i = 0; i < BKPOINTS_MAX; i++)
  345.         setup_dr(i);
  346.     spinlock_unlock(&bkpoint_lock);
  347. }
  348. #endif
  349.  
  350. /** Initialize debugger */
  351. void debugger_init()
  352. {
  353.     int i;
  354.  
  355.     for (i=0; i<BKPOINTS_MAX; i++)
  356.         breakpoints[i].address = NULL;
  357.    
  358.     cmd_initialize(&bkpts_info);
  359.     if (!cmd_register(&bkpts_info))
  360.         panic("could not register command %s\n", bkpts_info.name);
  361.  
  362. #ifndef CONFIG_DEBUG_AS_WATCHPOINT
  363.     cmd_initialize(&delbkpt_info);
  364.     if (!cmd_register(&delbkpt_info))
  365.         panic("could not register command %s\n", delbkpt_info.name);
  366.  
  367.     cmd_initialize(&addbkpt_info);
  368.     if (!cmd_register(&addbkpt_info))
  369.         panic("could not register command %s\n", addbkpt_info.name);
  370.  
  371.     cmd_initialize(&addwatchp_info);
  372.     if (!cmd_register(&addwatchp_info))
  373.         panic("could not register command %s\n", addwatchp_info.name);
  374. #endif
  375.    
  376.     exc_register(VECTOR_DEBUG, "debugger",
  377.              debug_exception);
  378. #ifdef CONFIG_SMP
  379.     exc_register(VECTOR_DEBUG_IPI, "debugger_smp",
  380.              debug_ipi);
  381. #endif
  382. }
  383.  
  384. /** @}
  385.  */
  386.