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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. #ifdef CONFIG_KCONSOLE
  58.  
  59. static int cmd_print_breakpoints(cmd_arg_t *argv);
  60. static cmd_info_t bkpts_info = {
  61.     .name = "bkpts",
  62.     .description = "Print breakpoint table.",
  63.     .func = cmd_print_breakpoints,
  64.     .argc = 0,
  65. };
  66.  
  67. #ifndef CONFIG_DEBUG_AS_WATCHPOINT
  68.  
  69. static int cmd_del_breakpoint(cmd_arg_t *argv);
  70. static cmd_arg_t del_argv = {
  71.     .type = ARG_TYPE_INT
  72. };
  73. static cmd_info_t delbkpt_info = {
  74.     .name = "delbkpt",
  75.     .description = "delbkpt <number> - Delete breakpoint.",
  76.     .func = cmd_del_breakpoint,
  77.     .argc = 1,
  78.     .argv = &del_argv
  79. };
  80.  
  81. static int cmd_add_breakpoint(cmd_arg_t *argv);
  82. static cmd_arg_t add_argv = {
  83.     .type = ARG_TYPE_INT
  84. };
  85. static cmd_info_t addbkpt_info = {
  86.     .name = "addbkpt",
  87.     .description = "addbkpt <&symbol> - new breakpoint.",
  88.     .func = cmd_add_breakpoint,
  89.     .argc = 1,
  90.     .argv = &add_argv
  91. };
  92.  
  93. static cmd_arg_t addw_argv = {
  94.     .type = ARG_TYPE_INT
  95. };
  96. static cmd_info_t addwatchp_info = {
  97.     .name = "addwatchp",
  98.     .description = "addbwatchp <&symbol> - new write watchpoint.",
  99.     .func = cmd_add_breakpoint,
  100.     .argc = 1,
  101.     .argv = &addw_argv
  102. };
  103.  
  104. #endif /* CONFIG_DEBUG_AS_WATCHPOINT */
  105. #endif /* CONFIG_KCONSOLE */
  106.  
  107. /* Setup DR register according to table */
  108. static void setup_dr(int curidx)
  109. {
  110.     unative_t dr7;
  111.     bpinfo_t *cur = &breakpoints[curidx];
  112.     int flags = breakpoints[curidx].flags;
  113.  
  114.     /* Disable breakpoint in DR7 */
  115.     dr7 = read_dr7();
  116.     dr7 &= ~(0x2 << (curidx*2));
  117.  
  118.     if (cur->address) { /* Setup DR register */
  119.         /* Set breakpoint to debug registers */
  120.         switch (curidx) {
  121.         case 0:
  122.             write_dr0(cur->address);
  123.             break;
  124.         case 1:
  125.             write_dr1(cur->address);
  126.             break;
  127.         case 2:
  128.             write_dr2(cur->address);
  129.             break;
  130.         case 3:
  131.             write_dr3(cur->address);
  132.             break;
  133.         }
  134.         /* Set type to requested breakpoint & length*/
  135.         dr7 &= ~ (0x3 << (16 + 4*curidx));
  136.         dr7 &= ~ (0x3 << (18 + 4*curidx));
  137.         if ((flags & BKPOINT_INSTR)) {
  138.             ;
  139.         } else {
  140.        
  141. #ifdef __32_BITS__
  142.             dr7 |= ((unative_t) 0x3) << (18 + 4 * curidx);
  143. #endif
  144.  
  145. #ifdef __64_BITS__
  146.             dr7 |= ((unative_t) 0x2) << (18 + 4 * curidx);
  147. #endif
  148.            
  149.             if ((flags & BKPOINT_WRITE))
  150.                 dr7 |= ((unative_t) 0x1) << (16 + 4 * curidx);
  151.             else if ((flags & BKPOINT_READ_WRITE))
  152.                 dr7 |= ((unative_t) 0x3) << (16 + 4 * curidx);
  153.         }
  154.  
  155.         /* Enable global breakpoint */
  156.         dr7 |= 0x2 << (curidx * 2);
  157.  
  158.         write_dr7(dr7);
  159.        
  160.     }
  161. }
  162.    
  163. /** Enable hardware breakpoint
  164.  *
  165.  * @param where Address of HW breakpoint
  166.  * @param flags Type of breakpoint (EXECUTE, WRITE)
  167.  * @return Debug slot on success, -1 - no available HW breakpoint
  168.  */
  169. int breakpoint_add(const void *where, const int flags, int curidx)
  170. {
  171.     ipl_t ipl;
  172.     int i;
  173.     bpinfo_t *cur;
  174.  
  175.     ASSERT(flags & (BKPOINT_INSTR | BKPOINT_WRITE | BKPOINT_READ_WRITE));
  176.  
  177.     ipl = interrupts_disable();
  178.     spinlock_lock(&bkpoint_lock);
  179.    
  180.     if (curidx == -1) {
  181.         /* Find free space in slots */
  182.         for (i = 0; i < BKPOINTS_MAX; i++)
  183.             if (!breakpoints[i].address) {
  184.                 curidx = i;
  185.                 break;
  186.             }
  187.         if (curidx == -1) {
  188.             /* Too many breakpoints */
  189.             spinlock_unlock(&bkpoint_lock);
  190.             interrupts_restore(ipl);
  191.             return -1;
  192.         }
  193.     }
  194.     cur = &breakpoints[curidx];
  195.  
  196.     cur->address = (uintptr_t) where;
  197.     cur->flags = flags;
  198.     cur->counter = 0;
  199.  
  200.     setup_dr(curidx);
  201.  
  202.     spinlock_unlock(&bkpoint_lock);
  203.     interrupts_restore(ipl);
  204.  
  205.     /* Send IPI */
  206. #ifdef CONFIG_SMP
  207. //  ipi_broadcast(VECTOR_DEBUG_IPI);   
  208. #endif 
  209.  
  210.     return curidx;
  211. }
  212.  
  213. #ifdef amd64
  214. #   define getip(x) ((x)->rip)
  215. #else
  216. #   define getip(x) ((x)->eip)
  217. #endif
  218.  
  219. static void handle_exception(int slot, istate_t *istate)
  220. {
  221.     ASSERT(breakpoints[slot].address);
  222.  
  223.     /* Handle zero checker */
  224.     if (! (breakpoints[slot].flags & BKPOINT_INSTR)) {
  225.         if ((breakpoints[slot].flags & BKPOINT_CHECK_ZERO)) {
  226.             if (*((unative_t *) breakpoints[slot].address) != 0)
  227.                 return;
  228.             printf("*** Found ZERO on address %lx (slot %d) ***\n",
  229.                 breakpoints[slot].address, slot);
  230.         } else {
  231.             printf("Data watchpoint - new data: %lx\n",
  232.                 *((unative_t *) breakpoints[slot].address));
  233.         }
  234.     }
  235.     printf("Reached breakpoint %d:%lx(%s)\n", slot, getip(istate),
  236.         get_symtab_entry(getip(istate)));
  237.  
  238. #ifdef CONFIG_KCONSOLE
  239.     atomic_set(&haltstate, 1);
  240.     kconsole("debug", "Debug console ready (type 'exit' to continue)\n", false);
  241.     atomic_set(&haltstate, 0);
  242. #endif
  243. }
  244.  
  245. void breakpoint_del(int slot)
  246. {
  247.     bpinfo_t *cur;
  248.     ipl_t ipl;
  249.  
  250.     ipl = interrupts_disable();
  251.     spinlock_lock(&bkpoint_lock);
  252.  
  253.     cur = &breakpoints[slot];
  254.     if (!cur->address) {
  255.         spinlock_unlock(&bkpoint_lock);
  256.         interrupts_restore(ipl);
  257.         return;
  258.     }
  259.  
  260.     cur->address = NULL;
  261.  
  262.     setup_dr(slot);
  263.  
  264.     spinlock_unlock(&bkpoint_lock);
  265.     interrupts_restore(ipl);
  266. #ifdef CONFIG_SMP
  267. //  ipi_broadcast(VECTOR_DEBUG_IPI);   
  268. #endif
  269. }
  270.  
  271.  
  272.  
  273. static void debug_exception(int n __attribute__((unused)), istate_t *istate)
  274. {
  275.     unative_t dr6;
  276.     int i;
  277.    
  278.     /* Set RF to restart the instruction  */
  279. #ifdef amd64      
  280.     istate->rflags |= RFLAGS_RF;
  281. #else
  282.     istate->eflags |= EFLAGS_RF;
  283. #endif
  284.  
  285.     dr6 = read_dr6();
  286.     for (i=0; i < BKPOINTS_MAX; i++) {
  287.         if (dr6 & (1 << i)) {
  288.             dr6 &= ~ (1 << i);
  289.             write_dr6(dr6);
  290.            
  291.             handle_exception(i, istate);
  292.         }
  293.     }
  294. }
  295.  
  296. #ifdef CONFIG_SMP
  297. static void
  298. debug_ipi(int n __attribute__((unused)),
  299.     istate_t *istate __attribute__((unused)))
  300. {
  301.     int i;
  302.  
  303.     spinlock_lock(&bkpoint_lock);
  304.     for (i = 0; i < BKPOINTS_MAX; i++)
  305.         setup_dr(i);
  306.     spinlock_unlock(&bkpoint_lock);
  307. }
  308. #endif
  309.  
  310. /** Initialize debugger */
  311. void debugger_init()
  312. {
  313.     int i;
  314.  
  315.     for (i = 0; i < BKPOINTS_MAX; i++)
  316.         breakpoints[i].address = NULL;
  317.  
  318. #ifdef CONFIG_KCONSOLE
  319.     cmd_initialize(&bkpts_info);
  320.     if (!cmd_register(&bkpts_info))
  321.         printf("Cannot register command %s\n", bkpts_info.name);
  322.  
  323. #ifndef CONFIG_DEBUG_AS_WATCHPOINT
  324.     cmd_initialize(&delbkpt_info);
  325.     if (!cmd_register(&delbkpt_info))
  326.         printf("Cannot register command %s\n", delbkpt_info.name);
  327.  
  328.     cmd_initialize(&addbkpt_info);
  329.     if (!cmd_register(&addbkpt_info))
  330.         printf("Cannot register command %s\n", addbkpt_info.name);
  331.  
  332.     cmd_initialize(&addwatchp_info);
  333.     if (!cmd_register(&addwatchp_info))
  334.         printf("Cannot register command %s\n", addwatchp_info.name);
  335. #endif /* CONFIG_DEBUG_AS_WATCHPOINT */
  336. #endif /* CONFIG_KCONSOLE */
  337.    
  338.     exc_register(VECTOR_DEBUG, "debugger", debug_exception);
  339. #ifdef CONFIG_SMP
  340.     exc_register(VECTOR_DEBUG_IPI, "debugger_smp", debug_ipi);
  341. #endif
  342. }
  343.  
  344. #ifdef CONFIG_KCONSOLE
  345. /** Print table of active breakpoints */
  346. int cmd_print_breakpoints(cmd_arg_t *argv __attribute__((unused)))
  347. {
  348.     unsigned int i;
  349.     char *symbol;
  350.  
  351. #ifdef __32_BITS__ 
  352.     printf("#  Count Address    In symbol\n");
  353.     printf("-- ----- ---------- ---------\n");
  354. #endif
  355.  
  356. #ifdef __64_BITS__
  357.     printf("#  Count Address            In symbol\n");
  358.     printf("-- ----- ------------------ ---------\n");
  359. #endif
  360.    
  361.     for (i = 0; i < BKPOINTS_MAX; i++)
  362.         if (breakpoints[i].address) {
  363.             symbol = get_symtab_entry(breakpoints[i].address);
  364.  
  365. #ifdef __32_BITS__
  366.             printf("%-2u %-5d %#10zx %s\n", i,
  367.                 breakpoints[i].counter, breakpoints[i].address,
  368.                 symbol);
  369. #endif
  370.  
  371. #ifdef __64_BITS__
  372.             printf("%-2u %-5d %#18zx %s\n", i,
  373.                 breakpoints[i].counter, breakpoints[i].address,
  374.                 symbol);
  375. #endif
  376.  
  377.         }
  378.     return 1;
  379. }
  380.  
  381. #ifndef CONFIG_DEBUG_AS_WATCHPOINT
  382.  
  383. /** Remove breakpoint from table */
  384. int cmd_del_breakpoint(cmd_arg_t *argv)
  385. {
  386.     unative_t bpno = argv->intval;
  387.     if (bpno > BKPOINTS_MAX) {
  388.         printf("Invalid breakpoint number.\n");
  389.         return 0;
  390.     }
  391.     breakpoint_del(argv->intval);
  392.     return 1;
  393. }
  394.  
  395. /** Add new breakpoint to table */
  396. static int cmd_add_breakpoint(cmd_arg_t *argv)
  397. {
  398.     int flags;
  399.     int id;
  400.  
  401.     if (argv == &add_argv) {
  402.         flags = BKPOINT_INSTR;
  403.     } else { /* addwatchp */
  404.         flags = BKPOINT_WRITE;
  405.     }
  406.     printf("Adding breakpoint on address: %p\n", argv->intval);
  407.     id = breakpoint_add((void *)argv->intval, flags, -1);
  408.     if (id < 0)
  409.         printf("Add breakpoint failed.\n");
  410.     else
  411.         printf("Added breakpoint %d.\n", id);
  412.    
  413.     return 1;
  414. }
  415. #endif /* CONFIG_DEBUG_AS_WATCHPOINT */
  416. #endif /* CONFIG_KCONSOLE */
  417.  
  418. /** @}
  419.  */
  420.