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| Rev | Author | Line No. | Line |
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| 2923 | svoboda | 1 | /* |
| 2 | * Copyright (c) 2008 Jiri Svoboda |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |||
| 29 | /** @addtogroup debug |
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| 30 | * @{ |
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| 31 | */ |
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| 32 | /** @file |
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| 33 | */ |
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| 34 | |||
| 35 | #include <stdio.h> |
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| 36 | #include <stdlib.h> |
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| 37 | #include <sys/types.h> |
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| 38 | #include <udebug.h> |
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| 39 | |||
| 40 | #include "../../../main.h" |
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| 41 | #include "../../../include/arch.h" |
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| 42 | |||
| 43 | #define OPCODE_INT3 0xCC |
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| 44 | |||
| 45 | #define ISTATE_OFF_EIP 12 |
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| 46 | #define ISTATE_OFF_EFLAGS 14 |
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| 47 | |||
| 48 | void arch_breakpoint_add(uintptr_t addr) |
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| 49 | { |
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| 50 | char brkp[1]; |
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| 51 | int rc; |
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| 52 | breakpoint_t *brk; |
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| 53 | int i; |
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| 54 | |||
| 55 | brk = NULL; |
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| 56 | for (i = 0; i < MAX_BRKPTS; i++) |
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| 57 | if (brk_list[i].set == 0) brk = brk_list+i; |
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| 58 | |||
| 59 | if (!brk) { |
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| 60 | printf("too many breakpoints\n"); |
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| 61 | return; |
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| 62 | } |
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| 63 | |||
| 64 | rc = udebug_mem_read(app_phone, &brk->arch.back, addr, 1); |
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| 65 | printf("udebug_mem_read() -> %d\n", rc); |
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| 66 | brkp[0] = OPCODE_INT3; |
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| 67 | rc = udebug_mem_write(app_phone, brkp, addr, 1); |
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| 68 | printf("udebug_mem_write() -> %d\n", rc); |
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| 69 | |||
| 70 | brk->addr = addr; |
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| 71 | brk->set = 1; |
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| 72 | } |
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| 73 | |||
| 74 | static unsigned buffer[1024]; |
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| 75 | static breakpoint_t *lifted_brkpt; |
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| 76 | |||
| 77 | void arch_event_breakpoint(thash_t thread_hash) |
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| 78 | { |
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| 79 | int rc; |
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| 80 | |||
| 81 | rc = udebug_regs_read(app_phone, thread_hash, buffer); |
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| 82 | printf("udebug_regs_read -> %d\n", rc); |
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| 83 | printf("EIP was 0x%08x\n", buffer[ISTATE_OFF_EIP]); |
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| 84 | int brk_addr = buffer[ISTATE_OFF_EIP] - 1; |
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| 85 | int bi; |
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| 86 | for (bi = 0; bi < MAX_BRKPTS; bi++) { |
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| 87 | if (brk_list[bi].set && brk_list[bi].addr == brk_addr) |
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| 88 | break; |
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| 89 | } |
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| 2924 | svoboda | 90 | |
| 2923 | svoboda | 91 | if (bi < MAX_BRKPTS) { |
| 2924 | svoboda | 92 | printf("breakpoint %d hit\n", bi); |
| 93 | |||
| 2923 | svoboda | 94 | buffer[ISTATE_OFF_EIP] = brk_addr; |
| 95 | buffer[ISTATE_OFF_EFLAGS] |= 0x0100; /* trap flag */ |
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| 96 | printf("setting EIP to 0x%08x\n", buffer[ISTATE_OFF_EIP]); |
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| 97 | rc = udebug_regs_write(app_phone, thread_hash, buffer); |
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| 98 | rc = udebug_mem_write(app_phone, &brk_list[bi].arch.back, brk_addr, 1); |
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| 99 | printf("udebug_mem_write(phone, 0x%x, 0x%02x, 1) -> %d\n", brk_addr, brk_list[bi].arch.back, rc); |
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| 100 | lifted_brkpt = &brk_list[bi]; |
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| 101 | } else { |
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| 102 | printf("unrecognized breakpoint at 0x%x\n", brk_addr); |
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| 103 | } |
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| 104 | } |
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| 105 | |||
| 106 | void arch_event_trap(thash_t thread_hash) |
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| 107 | { |
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| 108 | unsigned char brkinstr[1]; |
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| 109 | int rc; |
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| 110 | |||
| 2924 | svoboda | 111 | printf("trap event\n"); |
| 112 | |||
| 2923 | svoboda | 113 | breakpoint_t *lb = lifted_brkpt; |
| 114 | brkinstr[0] = OPCODE_INT3; |
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| 115 | rc = udebug_mem_write(app_phone, brkinstr, lb->addr, 1); |
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| 116 | printf("restore breakpoint -> %d\n", rc); |
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| 117 | |||
| 118 | rc = udebug_regs_read(app_phone, thread_hash, buffer); |
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| 119 | printf("udebug_regs_read -> %d\n", rc); |
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| 120 | buffer[ISTATE_OFF_EFLAGS] &= ~0x0100; /* trap flag */ |
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| 121 | rc = udebug_regs_write(app_phone, thread_hash, buffer); |
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| 122 | } |
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| 123 | |||
| 124 | /** @} |
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| 125 | */ |