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  1. /*
  2.  * Copyright (c) 2005 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 mips32debug
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #include <arch/debugger.h>
  36. #include <arch/barrier.h>
  37. #include <memstr.h>
  38. #include <console/kconsole.h>
  39. #include <console/cmd.h>
  40. #include <symtab.h>
  41. #include <print.h>
  42. #include <panic.h>
  43. #include <arch.h>
  44. #include <arch/cp0.h>
  45. #include <func.h>
  46.  
  47. bpinfo_t breakpoints[BKPOINTS_MAX];
  48. SPINLOCK_INITIALIZE(bkpoint_lock);
  49.  
  50. #ifdef CONFIG_KCONSOLE
  51.  
  52. static int cmd_print_breakpoints(cmd_arg_t *argv);
  53. static cmd_info_t bkpts_info = {
  54.     .name = "bkpts",
  55.     .description = "Print breakpoint table.",
  56.     .func = cmd_print_breakpoints,
  57.     .argc = 0,
  58. };
  59.  
  60. static int cmd_del_breakpoint(cmd_arg_t *argv);
  61. static cmd_arg_t del_argv = {
  62.     .type = ARG_TYPE_INT
  63. };
  64. static cmd_info_t delbkpt_info = {
  65.     .name = "delbkpt",
  66.     .description = "delbkpt <number> - Delete breakpoint.",
  67.     .func = cmd_del_breakpoint,
  68.     .argc = 1,
  69.     .argv = &del_argv
  70. };
  71.  
  72. static int cmd_add_breakpoint(cmd_arg_t *argv);
  73. static cmd_arg_t add_argv = {
  74.     .type = ARG_TYPE_INT
  75. };
  76. static cmd_info_t addbkpt_info = {
  77.     .name = "addbkpt",
  78.     .description = "addbkpt <&symbol> - new bkpoint. Break on J/Branch "
  79.         "insts unsupported.",
  80.     .func = cmd_add_breakpoint,
  81.     .argc = 1,
  82.     .argv = &add_argv
  83. };
  84.  
  85. static cmd_arg_t adde_argv[] = {
  86.     { .type = ARG_TYPE_INT },
  87.     { .type = ARG_TYPE_INT }
  88. };
  89. static cmd_info_t addbkpte_info = {
  90.     .name = "addbkpte",
  91.     .description = "addebkpte <&symbol> <&func> - new bkpoint. Call "
  92.         "func(or Nothing if 0).",
  93.     .func = cmd_add_breakpoint,
  94.     .argc = 2,
  95.     .argv = adde_argv
  96. };
  97.  
  98. static struct {
  99.     uint32_t andmask;
  100.     uint32_t value;
  101. } jmpinstr[] = {
  102.     {0xf3ff0000, 0x41000000}, /* BCzF */
  103.     {0xf3ff0000, 0x41020000}, /* BCzFL */
  104.     {0xf3ff0000, 0x41010000}, /* BCzT */
  105.     {0xf3ff0000, 0x41030000}, /* BCzTL */
  106.     {0xfc000000, 0x10000000}, /* BEQ */
  107.     {0xfc000000, 0x50000000}, /* BEQL */
  108.     {0xfc1f0000, 0x04010000}, /* BEQL */
  109.     {0xfc1f0000, 0x04110000}, /* BGEZAL */
  110.     {0xfc1f0000, 0x04130000}, /* BGEZALL */
  111.     {0xfc1f0000, 0x04030000}, /* BGEZL */
  112.     {0xfc1f0000, 0x1c000000}, /* BGTZ */
  113.     {0xfc1f0000, 0x5c000000}, /* BGTZL */
  114.     {0xfc1f0000, 0x18000000}, /* BLEZ */
  115.     {0xfc1f0000, 0x58000000}, /* BLEZL */
  116.     {0xfc1f0000, 0x04000000}, /* BLTZ */
  117.     {0xfc1f0000, 0x04100000}, /* BLTZAL */
  118.     {0xfc1f0000, 0x04120000}, /* BLTZALL */
  119.     {0xfc1f0000, 0x04020000}, /* BLTZL */
  120.     {0xfc000000, 0x14000000}, /* BNE */
  121.     {0xfc000000, 0x54000000}, /* BNEL */
  122.     {0xfc000000, 0x08000000}, /* J */
  123.     {0xfc000000, 0x0c000000}, /* JAL */
  124.     {0xfc1f07ff, 0x00000009}, /* JALR */
  125.     {0, 0} /* EndOfTable */
  126. };
  127.  
  128.  
  129. /** Test, if the given instruction is a jump or branch instruction
  130.  *
  131.  * @param instr Instruction code
  132.  * @return true - it is jump instruction, false otherwise
  133.  *
  134.  */
  135. static bool is_jump(unative_t instr)
  136. {
  137.     int i;
  138.  
  139.     for (i = 0; jmpinstr[i].andmask; i++) {
  140.         if ((instr & jmpinstr[i].andmask) == jmpinstr[i].value)
  141.             return true;
  142.     }
  143.  
  144.     return false;
  145. }
  146.  
  147. /** Add new breakpoint to table */
  148. int cmd_add_breakpoint(cmd_arg_t *argv)
  149. {
  150.     bpinfo_t *cur = NULL;
  151.     ipl_t ipl;
  152.     int i;
  153.  
  154.     if (argv->intval & 0x3) {
  155.         printf("Not aligned instruction, forgot to use &symbol?\n");
  156.         return 1;
  157.     }
  158.     ipl = interrupts_disable();
  159.     spinlock_lock(&bkpoint_lock);
  160.  
  161.     /* Check, that the breakpoints do not conflict */
  162.     for (i = 0; i < BKPOINTS_MAX; i++) {
  163.         if (breakpoints[i].address == (uintptr_t)argv->intval) {
  164.             printf("Duplicate breakpoint %d.\n", i);
  165.             spinlock_unlock(&bkpoints_lock);
  166.             return 0;
  167.         } else if (breakpoints[i].address == (uintptr_t)argv->intval +
  168.             sizeof(unative_t) || breakpoints[i].address ==
  169.             (uintptr_t)argv->intval - sizeof(unative_t)) {
  170.             printf("Adjacent breakpoints not supported, conflict "
  171.                 "with %d.\n", i);
  172.             spinlock_unlock(&bkpoints_lock);
  173.             return 0;
  174.         }
  175.            
  176.     }
  177.  
  178.     for (i = 0; i < BKPOINTS_MAX; i++)
  179.         if (!breakpoints[i].address) {
  180.             cur = &breakpoints[i];
  181.             break;
  182.         }
  183.     if (!cur) {
  184.         printf("Too many breakpoints.\n");
  185.         spinlock_unlock(&bkpoint_lock);
  186.         interrupts_restore(ipl);
  187.         return 0;
  188.     }
  189.     cur->address = (uintptr_t) argv->intval;
  190.     printf("Adding breakpoint on address: %p\n", argv->intval);
  191.     cur->instruction = ((unative_t *)cur->address)[0];
  192.     cur->nextinstruction = ((unative_t *)cur->address)[1];
  193.     if (argv == &add_argv) {
  194.         cur->flags = 0;
  195.     } else { /* We are add extended */
  196.         cur->flags = BKPOINT_FUNCCALL;
  197.         cur->bkfunc = (void (*)(void *, istate_t *)) argv[1].intval;
  198.     }
  199.     if (is_jump(cur->instruction))
  200.         cur->flags |= BKPOINT_ONESHOT;
  201.     cur->counter = 0;
  202.  
  203.     /* Set breakpoint */
  204.     *((unative_t *)cur->address) = 0x0d;
  205.     smc_coherence(cur->address);
  206.  
  207.     spinlock_unlock(&bkpoint_lock);
  208.     interrupts_restore(ipl);
  209.  
  210.     return 1;
  211. }
  212.  
  213. /** Remove breakpoint from table */
  214. int cmd_del_breakpoint(cmd_arg_t *argv)
  215. {
  216.     bpinfo_t *cur;
  217.     ipl_t ipl;
  218.  
  219.     if (argv->intval > BKPOINTS_MAX) {
  220.         printf("Invalid breakpoint number.\n");
  221.         return 0;
  222.     }
  223.     ipl = interrupts_disable();
  224.     spinlock_lock(&bkpoint_lock);
  225.  
  226.     cur = &breakpoints[argv->intval];
  227.     if (!cur->address) {
  228.         printf("Breakpoint does not exist.\n");
  229.         spinlock_unlock(&bkpoint_lock);
  230.         interrupts_restore(ipl);
  231.         return 0;
  232.     }
  233.     if ((cur->flags & BKPOINT_INPROG) && (cur->flags & BKPOINT_ONESHOT)) {
  234.         printf("Cannot remove one-shot breakpoint in-progress\n");
  235.         spinlock_unlock(&bkpoint_lock);
  236.         interrupts_restore(ipl);
  237.         return 0;
  238.     }
  239.     ((uint32_t *)cur->address)[0] = cur->instruction;
  240.     smc_coherence(((uint32_t *)cur->address)[0]);
  241.     ((uint32_t *)cur->address)[1] = cur->nextinstruction;
  242.     smc_coherence(((uint32_t *)cur->address)[1]);
  243.  
  244.     cur->address = NULL;
  245.  
  246.     spinlock_unlock(&bkpoint_lock);
  247.     interrupts_restore(ipl);
  248.     return 1;
  249. }
  250.  
  251. /** Print table of active breakpoints */
  252. int cmd_print_breakpoints(cmd_arg_t *argv)
  253. {
  254.     unsigned int i;
  255.     char *symbol;
  256.    
  257.     printf("#  Count Address    INPROG ONESHOT FUNCCALL In symbol\n");
  258.     printf("-- ----- ---------- ------ ------- -------- ---------\n");
  259.    
  260.     for (i = 0; i < BKPOINTS_MAX; i++)
  261.         if (breakpoints[i].address) {
  262.             symbol = get_symtab_entry(breakpoints[i].address);
  263.            
  264.             printf("%-2u %-5d %#10zx %-6s %-7s %-8s %s\n", i,
  265.                 breakpoints[i].counter, breakpoints[i].address,
  266.                 ((breakpoints[i].flags & BKPOINT_INPROG) ? "true" :
  267.                 "false"), ((breakpoints[i].flags & BKPOINT_ONESHOT)
  268.                 ? "true" : "false"), ((breakpoints[i].flags &
  269.                 BKPOINT_FUNCCALL) ? "true" : "false"), symbol);
  270.         }
  271.     return 1;
  272. }
  273.  
  274. #endif
  275.  
  276. /** Initialize debugger */
  277. void debugger_init()
  278. {
  279.     int i;
  280.  
  281.     for (i = 0; i < BKPOINTS_MAX; i++)
  282.         breakpoints[i].address = NULL;
  283.  
  284. #ifdef CONFIG_KCONSOLE
  285.     cmd_initialize(&bkpts_info);
  286.     if (!cmd_register(&bkpts_info))
  287.         printf("Cannot register command %s\n", bkpts_info.name);
  288.  
  289.     cmd_initialize(&delbkpt_info);
  290.     if (!cmd_register(&delbkpt_info))
  291.         printf("Cannot register command %s\n", delbkpt_info.name);
  292.  
  293.     cmd_initialize(&addbkpt_info);
  294.     if (!cmd_register(&addbkpt_info))
  295.         printf("Cannot register command %s\n", addbkpt_info.name);
  296.  
  297.     cmd_initialize(&addbkpte_info);
  298.     if (!cmd_register(&addbkpte_info))
  299.         printf("Cannot register command %s\n", addbkpte_info.name);
  300. #endif
  301. }
  302.  
  303. /** Handle breakpoint
  304.  *
  305.  * Find breakpoint in breakpoint table.
  306.  * If found, call kconsole, set break on next instruction and reexecute.
  307.  * If we are on "next instruction", set it back on the first and reexecute.
  308.  * If breakpoint not found in breakpoint table, call kconsole and start
  309.  * next instruction.
  310.  */
  311. void debugger_bpoint(istate_t *istate)
  312. {
  313.     bpinfo_t *cur = NULL;
  314.     uintptr_t fireaddr = istate->epc;
  315.     int i;
  316.  
  317.     /* test branch delay slot */
  318.     if (cp0_cause_read() & 0x80000000)
  319.         panic("Breakpoint in branch delay slot not supported.");
  320.  
  321.     spinlock_lock(&bkpoint_lock);
  322.     for (i = 0; i < BKPOINTS_MAX; i++) {
  323.         /* Normal breakpoint */
  324.         if (fireaddr == breakpoints[i].address &&
  325.             !(breakpoints[i].flags & BKPOINT_REINST)) {
  326.             cur = &breakpoints[i];
  327.             break;
  328.         }
  329.         /* Reinst only breakpoint */
  330.         if ((breakpoints[i].flags & BKPOINT_REINST) &&
  331.             (fireaddr == breakpoints[i].address + sizeof(unative_t))) {
  332.             cur = &breakpoints[i];
  333.             break;
  334.         }
  335.     }
  336.     if (cur) {
  337.         if (cur->flags & BKPOINT_REINST) {
  338.             /* Set breakpoint on first instruction */
  339.             ((uint32_t *)cur->address)[0] = 0x0d;
  340.             smc_coherence(((uint32_t *)cur->address)[0]);
  341.             /* Return back the second */
  342.             ((uint32_t *)cur->address)[1] = cur->nextinstruction;
  343.             smc_coherence(((uint32_t *)cur->address)[1]);
  344.             cur->flags &= ~BKPOINT_REINST;
  345.             spinlock_unlock(&bkpoint_lock);
  346.             return;
  347.         }
  348.         if (cur->flags & BKPOINT_INPROG)
  349.             printf("Warning: breakpoint recursion\n");
  350.        
  351.         if (!(cur->flags & BKPOINT_FUNCCALL))
  352.             printf("***Breakpoint %d: %p in %s.\n", i, fireaddr,
  353.                 get_symtab_entry(istate->epc));
  354.  
  355.         /* Return first instruction back */
  356.         ((uint32_t *)cur->address)[0] = cur->instruction;
  357.         smc_coherence(cur->address);
  358.  
  359.         if (! (cur->flags & BKPOINT_ONESHOT)) {
  360.             /* Set Breakpoint on next instruction */
  361.             ((uint32_t *)cur->address)[1] = 0x0d;
  362.             cur->flags |= BKPOINT_REINST;
  363.         }
  364.         cur->flags |= BKPOINT_INPROG;
  365.     } else {
  366.         printf("***Breakpoint %p in %s.\n", fireaddr,
  367.                get_symtab_entry(fireaddr));
  368.         /* Move on to next instruction */
  369.         istate->epc += 4;
  370.     }
  371.     if (cur)
  372.         cur->counter++;
  373.     if (cur && (cur->flags & BKPOINT_FUNCCALL)) {
  374.         /* Allow zero bkfunc, just for counting */
  375.         if (cur->bkfunc)
  376.             cur->bkfunc(cur, istate);
  377.     } else {
  378. #ifdef CONFIG_KCONSOLE
  379.         /* This disables all other processors - we are not SMP,
  380.          * actually this gets us to cpu_halt, if scheduler() is run
  381.          * - we generally do not want scheduler to be run from debug,
  382.          *   so this is a good idea
  383.          */
  384.         atomic_set(&haltstate, 1);
  385.         spinlock_unlock(&bkpoint_lock);
  386.        
  387.         kconsole("debug", "Debug console ready (type 'exit' to continue)\n", false);
  388.        
  389.         spinlock_lock(&bkpoint_lock);
  390.         atomic_set(&haltstate, 0);
  391. #endif
  392.     }
  393.     if (cur && cur->address == fireaddr && (cur->flags & BKPOINT_INPROG)) {
  394.         /* Remove one-shot breakpoint */
  395.         if ((cur->flags & BKPOINT_ONESHOT))
  396.             cur->address = NULL;
  397.         /* Remove in-progress flag */
  398.         cur->flags &= ~BKPOINT_INPROG;
  399.     }
  400.     spinlock_unlock(&bkpoint_lock);
  401. }
  402.  
  403. /** @}
  404.  */
  405.