[a0d4e99] | 1 | /* |
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| 2 | * Copyright (c) 2016 Chris Johns <chrisj@rtems.org>. All rights reserved. |
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| 3 | * |
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| 4 | * Redistribution and use in source and binary forms, with or without |
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| 5 | * modification, are permitted provided that the following conditions |
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| 6 | * are met: |
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| 7 | * 1. Redistributions of source code must retain the above copyright |
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| 8 | * notice, this list of conditions and the following disclaimer. |
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| 9 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer in the |
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| 11 | * documentation and/or other materials provided with the distribution. |
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| 12 | * |
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| 13 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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| 14 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 15 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 16 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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| 17 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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| 18 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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| 19 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 20 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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| 21 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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| 22 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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| 23 | * SUCH DAMAGE. |
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| 24 | */ |
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| 25 | |
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| 26 | #define TARGET_DEBUG 0 |
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| 27 | |
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| 28 | #ifdef HAVE_CONFIG_H |
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| 29 | #include "config.h" |
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| 30 | #endif |
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| 31 | |
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| 32 | #include <errno.h> |
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| 33 | #include <inttypes.h> |
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| 34 | #include <stdlib.h> |
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| 35 | |
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| 36 | #include <rtems.h> |
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| 37 | #include <rtems/score/threadimpl.h> |
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| 38 | |
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| 39 | #include <bsp/linker-symbols.h> |
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| 40 | |
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| 41 | #include "rtems-debugger-target.h" |
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| 42 | #include "rtems-debugger-threads.h" |
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| 43 | |
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| 44 | #if TARGET_DEBUG |
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| 45 | #include <rtems/bspIo.h> |
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| 46 | #endif |
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| 47 | |
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[e629076] | 48 | /* |
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| 49 | * ARM Variant controls. |
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| 50 | */ |
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| 51 | #if defined(__ARM_ARCH_7A__) || \ |
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| 52 | defined(__ARM_ARCH_7R__) |
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| 53 | #define ARM_CP15 1 |
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| 54 | #endif |
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| 55 | |
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| 56 | #if (defined(__ARM_ARCH_7M__) || \ |
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| 57 | defined(__ARM_ARCH_7EM__)) |
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| 58 | #define ARM_THUMB_ONLY 1 |
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| 59 | #else |
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| 60 | #define ARM_THUMB_ONLY 0 |
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| 61 | #endif |
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| 62 | |
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| 63 | #if defined(ARM_MULTILIB_ARCH_V4) |
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| 64 | #define ARM_PSR_HAS_INT_MASK 1 |
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| 65 | #define ARM_PSR_HAS_THUMB 1 |
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| 66 | #else |
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| 67 | #define ARM_PSR_HAS_INT_MASK 0 |
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| 68 | #define ARM_PSR_HAS_THUMB 0 |
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| 69 | #endif |
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| 70 | |
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| 71 | #if ARM_CP15 |
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| 72 | #include <libcpu/arm-cp15.h> |
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| 73 | #endif |
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| 74 | |
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| 75 | /** |
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| 76 | * If thumb build of code switch the asm to thumb as required. |
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| 77 | * |
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| 78 | * If the variant only supports thumb insturctions disable the support. |
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| 79 | */ |
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| 80 | #define ARM_SWITCH_REG uint32_t arm_switch_reg |
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| 81 | #define ARM_SWITCH_REG_ASM [arm_switch_reg] "=&r" (arm_switch_reg) |
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| 82 | #if !ARM_THUMB_ONLY && defined(__thumb__) |
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| 83 | #define ASM_ARM_MODE ".align 2\nbx pc\n.arm\n" |
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| 84 | #define ASM_THUMB_MODE "add %[arm_switch_reg], pc, #1\nbx %[arm_switch_reg]\n.thumb\n" |
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| 85 | #else |
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| 86 | #define ASM_ARM_MODE |
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| 87 | #define ASM_THUMB_MODE |
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| 88 | #endif |
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| 89 | |
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| 90 | /* |
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| 91 | * Hack to work around ARMv7-M not having a the T and I bits in the PSR. |
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| 92 | * |
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| 93 | * This needs to be fixed when real support for this ARM variant is added. |
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| 94 | */ |
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| 95 | #if !defined(ARM_PSR_I) |
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| 96 | #define ARM_PSR_I 0 |
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| 97 | #endif |
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| 98 | #if !defined(ARM_PSR_T) |
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| 99 | #define ARM_PSR_T 0 |
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| 100 | #endif |
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| 101 | |
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[a0d4e99] | 102 | /* |
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| 103 | * The ARM has 2 interrupt bits. |
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| 104 | */ |
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| 105 | #define CPSR_IRQ_DISABLE 0x80 /* IIQ disabled when 1 */ |
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| 106 | #define CPSR_FIQ_DISABLE 0x40 /* FIQ disabled when 1 */ |
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| 107 | #define CPSR_INTS_MASK (CPSR_IRQ_DISABLE | CPSR_FIQ_DISABLE) |
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| 108 | |
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| 109 | /* |
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| 110 | * Software breakpoint block size. |
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| 111 | */ |
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| 112 | #define RTEMS_DEBUGGER_SWBREAK_NUM 64 |
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| 113 | |
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| 114 | /* |
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| 115 | * Number of registers. |
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| 116 | */ |
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| 117 | #define RTEMS_DEBUGGER_NUMREGS 26 |
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| 118 | |
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| 119 | /* |
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| 120 | * Number of bytes per register. |
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| 121 | */ |
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| 122 | #define RTEMS_DEBUGGER_REGBYTES 4 |
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| 123 | |
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| 124 | /* |
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| 125 | * Number of bytes of registers. |
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| 126 | */ |
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| 127 | #define RTEMS_DEBUGGER_NUMREGBYTES \ |
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| 128 | (RTEMS_DEBUGGER_NUMREGS * RTEMS_DEBUGGER_REGBYTES) |
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| 129 | |
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| 130 | /* |
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| 131 | * Debugger registers layout. |
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| 132 | */ |
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| 133 | #define REG_R0 0 |
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| 134 | #define REG_R1 1 |
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| 135 | #define REG_R2 2 |
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| 136 | #define REG_R3 3 |
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| 137 | #define REG_R4 4 |
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| 138 | #define REG_R5 5 |
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| 139 | #define REG_R6 6 |
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| 140 | #define REG_R7 7 |
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| 141 | #define REG_R8 8 |
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| 142 | #define REG_R9 9 |
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| 143 | #define REG_R10 10 |
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| 144 | #define REG_R11 11 |
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| 145 | #define REG_R12 12 |
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| 146 | #define REG_SP 13 |
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| 147 | #define REG_LR 14 |
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| 148 | #define REG_PC 15 |
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| 149 | #define REG_CPSR 25 |
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| 150 | |
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| 151 | /** |
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| 152 | * The various status registers. |
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| 153 | */ |
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| 154 | #if defined(ARM_MULTILIB_ARCH_V4) |
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| 155 | #define FRAME_SR frame->register_cpsr |
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| 156 | #elif defined(ARM_MULTILIB_ARCH_V7M) |
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| 157 | #define FRAME_SR frame->register_xpsr |
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| 158 | #else |
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| 159 | #error ARM architecture is not supported. |
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| 160 | #endif |
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| 161 | |
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| 162 | /** |
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| 163 | * The breakpoint. |
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| 164 | */ |
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| 165 | #ifdef __thumb__ |
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| 166 | static const uint8_t breakpoint[2] = { 0x55, 0xbe }; |
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| 167 | #else |
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[e629076] | 168 | static const uint8_t breakpoint[4] = { 0x75, 0xe0, 0x20, 0xe1 }; |
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[a0d4e99] | 169 | #endif |
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| 170 | |
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| 171 | /** |
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| 172 | * Target lock. |
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| 173 | */ |
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| 174 | RTEMS_INTERRUPT_LOCK_DEFINE(static, target_lock, "target_lock") |
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| 175 | |
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| 176 | /** |
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| 177 | * Is a session active? |
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| 178 | */ |
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| 179 | static bool debug_session_active; |
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| 180 | |
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| 181 | /* |
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| 182 | * ARM debug hardware. |
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| 183 | */ |
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| 184 | static int debug_version; |
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| 185 | static int debug_revision;; |
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| 186 | static int hw_breakpoints; |
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| 187 | static int hw_watchpoints; |
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| 188 | |
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| 189 | /** |
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| 190 | * Hardware break and watch points. |
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| 191 | */ |
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| 192 | typedef struct |
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| 193 | { |
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| 194 | bool enabled; |
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| 195 | bool loaded; |
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| 196 | void* address; |
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| 197 | size_t length; |
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| 198 | CPU_Exception_frame* frame; |
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| 199 | uint32_t control; |
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| 200 | uint32_t value; |
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| 201 | } arm_debug_hwbreak; |
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| 202 | |
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| 203 | #define ARM_HW_BREAKPOINT_MAX (16) |
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| 204 | #define ARM_HW_WATCHPOINT_MAX (16) |
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| 205 | |
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| 206 | /* |
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| 207 | * Types of break points. Only the 2 we use listed. |
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| 208 | */ |
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| 209 | #define ARM_HW_BP_UNLINKED_INSTR_MATCH (0x00) |
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| 210 | #define ARM_HW_BP_UNLINKED_INSTR_MISMATCH (0x04) |
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| 211 | |
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| 212 | /* |
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| 213 | * Privilege levels. |
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| 214 | */ |
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| 215 | #define ARM_HW_BP_PRIV_PL0_SUP_SYS (0x00) |
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| 216 | #define ARM_HW_BP_PRIV_PL1_ONLY (0x01) |
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| 217 | #define ARM_HW_BP_PRIV_PL0_ONLY (0x02) |
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| 218 | #define ARM_HW_BP_PRIV_ALL_MODES (0x03) |
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| 219 | |
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| 220 | static arm_debug_hwbreak hw_breaks[ARM_HW_BREAKPOINT_MAX]; |
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| 221 | //static arm_debug_hwbreak hw_watches[ARM_HW_WATCHPOINT_MAX]; |
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| 222 | |
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| 223 | #if TARGET_DEBUG |
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| 224 | static void target_printk(const char* format, ...) RTEMS_PRINTFLIKE(1, 2); |
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| 225 | static void |
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| 226 | target_printk(const char* format, ...) |
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| 227 | { |
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| 228 | va_list ap; |
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| 229 | va_start(ap, format); |
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| 230 | vprintk(format, ap); |
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| 231 | va_end(ap); |
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| 232 | } |
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| 233 | static const char* |
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| 234 | mode_label(int mode) |
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| 235 | { |
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| 236 | switch (mode) { |
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| 237 | case 0x10: |
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| 238 | return "USR"; |
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| 239 | case 0x11: |
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| 240 | return "FIQ"; |
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| 241 | case 0x12: |
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| 242 | return "IRQ"; |
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| 243 | case 0x13: |
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| 244 | return "SVC"; |
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| 245 | case 0x16: |
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| 246 | return "MON"; |
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| 247 | case 0x17: |
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| 248 | return "ABT"; |
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| 249 | case 0x1a: |
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| 250 | return "HYP"; |
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| 251 | case 0x1b: |
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| 252 | return "UND"; |
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| 253 | case 0x1f: |
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| 254 | return "SYS"; |
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| 255 | } |
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| 256 | return "---"; |
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| 257 | } |
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| 258 | #else |
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| 259 | #define target_printk(_fmt, ...) |
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| 260 | #define mode_labels(_m) NULL |
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| 261 | #endif |
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| 262 | |
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| 263 | /* |
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| 264 | * Read and write a CP14 register. |
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| 265 | * |
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| 266 | * The software debug event registers are not easy to program because there are |
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| 267 | * up to 32 registers and the instructions have to assembler for each of the 32 |
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| 268 | * registers, you cannot program it. This means there is a switch table to do |
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| 269 | * this. |
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| 270 | */ |
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| 271 | #define ARM_CP14_INSTR(_opc, _val, _CRn, _CRm, _opc2) \ |
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| 272 | #_opc " p14, 0, %[" #_val "], c" #_CRn ", c" #_CRm ", " #_opc2 "\n" |
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| 273 | |
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| 274 | #define ARM_CP14_WRITE(_val, _CRn, _CRm, _opc2) \ |
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| 275 | do { \ |
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[e629076] | 276 | ARM_SWITCH_REG; \ |
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[a0d4e99] | 277 | asm volatile( \ |
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[e629076] | 278 | ASM_ARM_MODE \ |
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[a0d4e99] | 279 | ARM_CP14_INSTR(mcr, val, _CRn, _CRm, _opc2) \ |
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[e629076] | 280 | ASM_THUMB_MODE \ |
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| 281 | : ARM_SWITCH_REG_ASM \ |
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| 282 | : [val] "r" (_val)); \ |
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[a0d4e99] | 283 | } while (0) |
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| 284 | |
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| 285 | #define ARM_CP14_READ(_val, _CRn, _CRm, _opc2) \ |
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| 286 | do { \ |
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[e629076] | 287 | ARM_SWITCH_REG; \ |
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[a0d4e99] | 288 | asm volatile( \ |
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[e629076] | 289 | ASM_ARM_MODE \ |
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[a0d4e99] | 290 | ARM_CP14_INSTR(mrc, val, _CRn, _CRm, _opc2) \ |
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[e629076] | 291 | ASM_THUMB_MODE \ |
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| 292 | : ARM_SWITCH_REG_ASM, \ |
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| 293 | [val] "=&r" (_val)); \ |
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[a0d4e99] | 294 | } while (0) |
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| 295 | |
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| 296 | static int |
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| 297 | arm_debug_probe(rtems_debugger_target* target) |
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| 298 | { |
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| 299 | #define ID_VALUE(_i, _h, _l) ((_i >> _l) & ((1 << ((_h - _l) + 1)) -1)) |
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| 300 | uint32_t val; |
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| 301 | const char const* vl = "[Invalid version]"; |
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| 302 | const char const* labels[] = { |
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| 303 | "ARMv6 [v6]", |
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| 304 | "ARMv6 [v6.1]", |
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| 305 | "ARMv7 [v7, all CP14 registers]", |
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| 306 | "ARMv7 [v7, baseline CP14 registers]", |
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| 307 | "ARMv7 [v7.1]" |
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| 308 | }; |
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| 309 | ARM_CP14_READ(val, 0, 0, 0); |
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| 310 | debug_version = ID_VALUE(val, 19, 16); |
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| 311 | if (debug_version < 1 || debug_version > 5) { |
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| 312 | rtems_debugger_printf("rtems-db: arm debug: (v%d.%d) not supported\n", |
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| 313 | debug_version, debug_revision); |
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| 314 | errno = EIO; |
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| 315 | return -1; |
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| 316 | } |
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| 317 | vl = labels[debug_version - 1]; |
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| 318 | debug_revision = ID_VALUE(val, 3, 0); |
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| 319 | hw_breakpoints = ID_VALUE(val, 27, 24); |
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| 320 | hw_watchpoints = ID_VALUE(val, 31, 28); |
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| 321 | rtems_debugger_printf("rtems-db: arm debug: (v%d.%d) %s breakpoints:%d watchpoints:%d\n", |
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| 322 | debug_version, debug_revision, vl, |
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| 323 | hw_breakpoints, hw_watchpoints); |
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| 324 | ARM_CP14_READ(val, 0, 1, 0); |
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| 325 | if ((val & (1 << 15)) == 0) { |
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| 326 | switch (debug_version) { |
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| 327 | case 1: |
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| 328 | case 2: |
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| 329 | ARM_CP14_WRITE(val | (1 << 15), 0, 1, 0); |
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| 330 | break; |
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| 331 | case 3: |
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| 332 | case 4: |
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| 333 | case 5: |
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| 334 | default: |
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| 335 | ARM_CP14_WRITE(val | (1 << 15), 0, 2, 2); |
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| 336 | break; |
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| 337 | } |
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| 338 | ARM_CP14_READ(val, 0, 1, 0); |
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| 339 | if ((val & (1 << 15)) == 0) { |
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| 340 | rtems_debugger_printf("rtems-db: arm debug: cannot enter monitor mode\n"); |
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| 341 | errno = EIO; |
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| 342 | return -1; |
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| 343 | } |
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| 344 | } |
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| 345 | return 0; |
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| 346 | } |
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| 347 | |
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| 348 | static inline void |
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| 349 | arm_debug_break_setup(arm_debug_hwbreak* bp, |
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| 350 | uint32_t address, |
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| 351 | uint32_t type, |
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| 352 | uint32_t byte_address_select, |
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| 353 | uint32_t privilege) |
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| 354 | { |
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| 355 | bp->control = (((type & 0xf) << 20) | |
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| 356 | ((byte_address_select & 0xf) << 5) | |
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| 357 | ((privilege & 0x3) << 1) | 1); |
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| 358 | bp->value = (intptr_t) address; |
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| 359 | } |
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| 360 | |
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| 361 | static void |
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| 362 | arm_debug_break_write_control(int bp, uint32_t control) |
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| 363 | { |
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| 364 | switch (bp) { |
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| 365 | case 0: |
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| 366 | ARM_CP14_WRITE(control, 0, 0, 5); |
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| 367 | break; |
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| 368 | case 1: |
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| 369 | ARM_CP14_WRITE(control, 0, 1, 5); |
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| 370 | break; |
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| 371 | case 2: |
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| 372 | ARM_CP14_WRITE(control, 0, 2, 5); |
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| 373 | break; |
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| 374 | case 3: |
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| 375 | ARM_CP14_WRITE(control, 0, 3, 5); |
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| 376 | break; |
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| 377 | case 4: |
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| 378 | ARM_CP14_WRITE(control, 0, 4, 5); |
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| 379 | break; |
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| 380 | case 5: |
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| 381 | ARM_CP14_WRITE(control, 0, 5, 5); |
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| 382 | break; |
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| 383 | case 6: |
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| 384 | ARM_CP14_WRITE(control, 0, 6, 5); |
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| 385 | break; |
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| 386 | case 7: |
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| 387 | ARM_CP14_WRITE(control, 0, 7, 5); |
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| 388 | break; |
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| 389 | case 8: |
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| 390 | ARM_CP14_WRITE(control, 0, 8, 5); |
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| 391 | break; |
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| 392 | case 9: |
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| 393 | ARM_CP14_WRITE(control, 0, 9, 5); |
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| 394 | break; |
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| 395 | case 10: |
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| 396 | ARM_CP14_WRITE(control, 0, 10, 5); |
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| 397 | break; |
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| 398 | case 11: |
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| 399 | ARM_CP14_WRITE(control, 0, 11, 5); |
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| 400 | break; |
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| 401 | case 12: |
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| 402 | ARM_CP14_WRITE(control, 0, 12, 5); |
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| 403 | break; |
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| 404 | case 13: |
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| 405 | ARM_CP14_WRITE(control, 0, 13, 5); |
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| 406 | break; |
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| 407 | case 14: |
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| 408 | ARM_CP14_WRITE(control, 0, 14, 5); |
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| 409 | break; |
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| 410 | case 15: |
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| 411 | ARM_CP14_WRITE(control, 0, 15, 5); |
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| 412 | break; |
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| 413 | } |
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| 414 | } |
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| 415 | |
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| 416 | static void |
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| 417 | arm_debug_break_write_value(int bp, uint32_t value) |
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| 418 | { |
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| 419 | switch (bp) { |
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| 420 | case 0: |
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| 421 | ARM_CP14_WRITE(value, 0, 0, 4); |
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| 422 | break; |
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| 423 | case 1: |
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| 424 | ARM_CP14_WRITE(value, 0, 1, 4); |
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| 425 | break; |
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| 426 | case 2: |
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| 427 | ARM_CP14_WRITE(value, 0, 2, 4); |
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| 428 | break; |
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| 429 | case 3: |
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| 430 | ARM_CP14_WRITE(value, 0, 3, 4); |
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| 431 | break; |
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| 432 | case 4: |
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| 433 | ARM_CP14_WRITE(value, 0, 4, 4); |
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| 434 | break; |
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| 435 | case 5: |
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| 436 | ARM_CP14_WRITE(value, 0, 5, 4); |
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| 437 | break; |
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| 438 | case 6: |
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| 439 | ARM_CP14_WRITE(value, 0, 6, 4); |
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| 440 | break; |
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| 441 | case 7: |
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| 442 | ARM_CP14_WRITE(value, 0, 7, 4); |
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| 443 | break; |
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| 444 | case 8: |
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| 445 | ARM_CP14_WRITE(value, 0, 8, 4); |
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| 446 | break; |
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| 447 | case 9: |
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| 448 | ARM_CP14_WRITE(value, 0, 9, 4); |
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| 449 | break; |
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| 450 | case 10: |
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| 451 | ARM_CP14_WRITE(value, 0, 10, 4); |
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| 452 | break; |
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| 453 | case 11: |
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| 454 | ARM_CP14_WRITE(value, 0, 11, 4); |
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| 455 | break; |
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| 456 | case 12: |
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| 457 | ARM_CP14_WRITE(value, 0, 12, 4); |
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| 458 | break; |
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| 459 | case 13: |
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| 460 | ARM_CP14_WRITE(value, 0, 13, 4); |
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| 461 | break; |
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| 462 | case 14: |
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| 463 | ARM_CP14_WRITE(value, 0, 14, 4); |
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| 464 | break; |
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| 465 | case 15: |
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| 466 | ARM_CP14_WRITE(value, 0, 15, 4); |
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| 467 | break; |
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| 468 | } |
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| 469 | } |
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| 470 | |
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| 471 | static void |
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| 472 | arm_debug_break_clear(void) |
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| 473 | { |
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| 474 | arm_debug_hwbreak* bp = &hw_breaks[0]; |
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| 475 | int i; |
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| 476 | for (i = 0; i < hw_breakpoints; ++i, ++bp) { |
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| 477 | bp->enabled = false; |
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| 478 | bp->loaded = false; |
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| 479 | } |
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| 480 | } |
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| 481 | |
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| 482 | static void |
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| 483 | arm_debug_break_load(void) |
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| 484 | { |
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| 485 | arm_debug_hwbreak* bp = &hw_breaks[0]; |
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| 486 | int i; |
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| 487 | for (i = 0; i < hw_breakpoints; ++i, ++bp) { |
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| 488 | if (bp->enabled && !bp->loaded) { |
---|
| 489 | bp->loaded = true; |
---|
| 490 | target_printk("]]} hwbp: %i: v:%08lx c:%08lx l:%08x\n", |
---|
| 491 | i, bp->value, bp->control, bp->length); |
---|
| 492 | arm_debug_break_write_value(i, bp->value); |
---|
| 493 | arm_debug_break_write_control(i, bp->control); |
---|
| 494 | } |
---|
| 495 | } |
---|
| 496 | } |
---|
| 497 | |
---|
| 498 | static void |
---|
| 499 | arm_debug_break_unload(void) |
---|
| 500 | { |
---|
| 501 | arm_debug_hwbreak* bp = &hw_breaks[0]; |
---|
| 502 | int i; |
---|
| 503 | for (i = 0; i < hw_breakpoints; ++i, ++bp) { |
---|
| 504 | bp->loaded = false; |
---|
| 505 | arm_debug_break_write_control(i, 0); |
---|
| 506 | } |
---|
| 507 | } |
---|
| 508 | |
---|
| 509 | #if NOT_USED_BUT_KEEPING |
---|
| 510 | static size_t |
---|
| 511 | arm_debug_break_length(void* pc) |
---|
| 512 | { |
---|
| 513 | arm_debug_hwbreak* bp = &hw_breaks[0]; |
---|
| 514 | int i; |
---|
| 515 | |
---|
| 516 | for (i = 0; i < hw_breakpoints; ++i, ++bp) { |
---|
| 517 | if (bp->enabled && bp->address == pc) { |
---|
| 518 | return bp->length; |
---|
| 519 | } |
---|
| 520 | } |
---|
| 521 | return sizeof(DB_UINT); |
---|
| 522 | } |
---|
| 523 | #endif |
---|
| 524 | |
---|
| 525 | int |
---|
| 526 | rtems_debugger_target_configure(rtems_debugger_target* target) |
---|
| 527 | { |
---|
| 528 | target->capabilities = (RTEMS_DEBUGGER_TARGET_CAP_SWBREAK); |
---|
| 529 | target->reg_num = RTEMS_DEBUGGER_NUMREGS; |
---|
| 530 | target->reg_size = sizeof(uint32_t); |
---|
| 531 | target->breakpoint = &breakpoint[0]; |
---|
| 532 | target->breakpoint_size = sizeof(breakpoint); |
---|
| 533 | return arm_debug_probe(target); |
---|
| 534 | } |
---|
| 535 | |
---|
| 536 | static void |
---|
| 537 | target_exception(CPU_Exception_frame* frame) |
---|
| 538 | { |
---|
| 539 | #if TARGET_DEBUG |
---|
| 540 | uint32_t ifsr = arm_cp15_get_instruction_fault_status(); |
---|
| 541 | #endif |
---|
| 542 | |
---|
| 543 | target_printk("[} frame = %08lx sig=%d vector=%x ifsr=%08lx pra=%08x\n", |
---|
| 544 | (uint32_t) frame, |
---|
| 545 | rtems_debugger_target_exception_to_signal(frame), |
---|
| 546 | frame->vector, ifsr, (intptr_t) frame->register_pc); |
---|
| 547 | |
---|
| 548 | if ((FRAME_SR & (1 << 5)) == 0) |
---|
| 549 | frame->register_pc = (void*) ((intptr_t) frame->register_pc - 8); |
---|
| 550 | else |
---|
| 551 | frame->register_pc = (void*) ((intptr_t) frame->register_pc - 4); |
---|
| 552 | |
---|
| 553 | target_printk("[} R0 = %08" PRIx32 " R1 = %08" PRIx32 \ |
---|
| 554 | " R2 = %08" PRIx32 " R3 = %08" PRIx32 "\n", |
---|
| 555 | frame->register_r0, frame->register_r1, |
---|
| 556 | frame->register_r2, frame->register_r3); |
---|
| 557 | target_printk("[} R4 = %08" PRIx32 " R5 = %08" PRIx32 \ |
---|
| 558 | " R6 = %08" PRIx32 " R7 = %08" PRIx32 "\n", |
---|
| 559 | frame->register_r4, frame->register_r5, |
---|
| 560 | frame->register_r6, frame->register_r7); |
---|
| 561 | target_printk("[} R8 = %08" PRIx32 " R9 = %08" PRIx32 \ |
---|
| 562 | " R10 = %08" PRIx32 " R11 = %08" PRIx32 "\n", |
---|
| 563 | frame->register_r8, frame->register_r9, |
---|
| 564 | frame->register_r10, frame->register_r11); |
---|
| 565 | target_printk("[} R12 = %08" PRIx32 " SP = %08" PRIx32 \ |
---|
| 566 | " LR = %08" PRIxPTR " PC = %08" PRIxPTR "\n", \ |
---|
| 567 | frame->register_r12, frame->register_sp, |
---|
| 568 | (intptr_t) frame->register_lr, (intptr_t) frame->register_pc); |
---|
| 569 | target_printk("[} CPSR = %08" PRIx32 " %c%c%c%c%c%c%c%c%c%c%c" \ |
---|
| 570 | " GE:%" PRIx32 " IT:%02" PRIx32 " M:%" PRIx32 " %s\n", |
---|
| 571 | FRAME_SR, |
---|
| 572 | (FRAME_SR & (1 << 31)) != 0 ? 'N' : '-', |
---|
| 573 | (FRAME_SR & (1 << 30)) != 0 ? 'Z' : '-', |
---|
| 574 | (FRAME_SR & (1 << 29)) != 0 ? 'C' : '-', |
---|
| 575 | (FRAME_SR & (1 << 28)) != 0 ? 'V' : '-', |
---|
| 576 | (FRAME_SR & (1 << 27)) != 0 ? 'Q' : '-', |
---|
| 577 | (FRAME_SR & (1 << 24)) != 0 ? 'J' : '-', |
---|
| 578 | (FRAME_SR & (1 << 9)) != 0 ? 'E' : '-', |
---|
| 579 | (FRAME_SR & (1 << 8)) != 0 ? 'A' : '-', |
---|
| 580 | (FRAME_SR & (1 << 7)) != 0 ? 'I' : '-', |
---|
| 581 | (FRAME_SR & (1 << 6)) != 0 ? 'F' : '-', |
---|
| 582 | (FRAME_SR & (1 << 5)) != 0 ? 'T' : '-', |
---|
| 583 | ((FRAME_SR >> (25 - 5)) & (0x3 << 5)) | ((FRAME_SR >> 10) & 0x1f), |
---|
| 584 | (FRAME_SR >> 16) & 0xf, |
---|
| 585 | FRAME_SR & 0x1f, mode_label(FRAME_SR & 0x1f)); |
---|
| 586 | |
---|
| 587 | arm_debug_break_clear(); |
---|
| 588 | |
---|
| 589 | if (!debug_session_active) |
---|
| 590 | _ARM_Exception_default(frame); |
---|
| 591 | |
---|
| 592 | switch (rtems_debugger_target_exception(frame)) { |
---|
| 593 | case rtems_debugger_target_exc_consumed: |
---|
| 594 | default: |
---|
| 595 | break; |
---|
| 596 | case rtems_debugger_target_exc_step: |
---|
| 597 | FRAME_SR |= CPSR_INTS_MASK; |
---|
| 598 | break; |
---|
| 599 | case rtems_debugger_target_exc_cascade: |
---|
| 600 | target_printk("rtems-db: unhandled exception: cascading\n"); |
---|
| 601 | _ARM_Exception_default(frame); |
---|
| 602 | break; |
---|
| 603 | } |
---|
| 604 | |
---|
| 605 | target_printk("[} resuming frame = %08lx PC = %08" PRIxPTR " CPSR = %08" PRIx32 "\n", |
---|
| 606 | (uint32_t) frame, (intptr_t) frame->register_pc, FRAME_SR); |
---|
| 607 | } |
---|
| 608 | |
---|
| 609 | /** |
---|
| 610 | * Exception stack frame size. |
---|
| 611 | * |
---|
| 612 | * The size is the exception stack frame plus the CPSR from the exception. We |
---|
| 613 | * save the CPSR and restore it when we exit the exception. |
---|
| 614 | */ |
---|
| 615 | #define EXCEPTION_FRAME_SIZE (sizeof(CPU_Exception_frame) + sizeof(uint32_t)) |
---|
| 616 | |
---|
| 617 | /** |
---|
| 618 | * Exception stack frame FPU offsets and sizes. |
---|
| 619 | */ |
---|
| 620 | #define EXCEPTION_FRAME_FPU_SIZE ARM_VFP_CONTEXT_SIZE |
---|
| 621 | #define EXCEPTION_FRAME_FPU_OFFSET ARM_EXCEPTION_FRAME_VFP_CONTEXT_OFFSET |
---|
| 622 | |
---|
| 623 | /** |
---|
| 624 | * Exception entry. |
---|
| 625 | * |
---|
| 626 | * We have switched from svc (or even user) to an exception mode. Save the |
---|
| 627 | * current CPSR and create an exception frame on the exception's stack and then |
---|
| 628 | * copy it to the thread's stack. Switch back to the thread's context and mode |
---|
| 629 | * to handle the exception to avoid any stack checks thinking the stack is |
---|
| 630 | * blown. This lets the thread be suspended. |
---|
| 631 | * |
---|
| 632 | * The entry is in two parts, the exception mode entry and the trhead mode |
---|
| 633 | * entry. This lets us disable any hardware breakpoint support. We need to do |
---|
| 634 | * this because it is enabled in PL0 mode. |
---|
| 635 | * |
---|
| 636 | * Note, the code currently assumes cp15 has been set up to match the |
---|
| 637 | * instruction set being used. |
---|
| 638 | */ |
---|
| 639 | #define EXCEPTION_ENTRY_EXC() \ |
---|
| 640 | __asm__ volatile( \ |
---|
| 641 | ASM_ARM_MODE \ |
---|
| 642 | "sub sp, %[frame_size]\n" /* alloc the frame and CPSR */ \ |
---|
| 643 | "stm sp, {r0-r12}\n" /* store r0-r12 */ \ |
---|
| 644 | "sub sp, #4\n" \ |
---|
| 645 | "str lr, [sp]\n" /* save the link reg */ \ |
---|
| 646 | ASM_THUMB_MODE \ |
---|
[e629076] | 647 | : ARM_SWITCH_REG_ASM \ |
---|
[a0d4e99] | 648 | : [frame_size] "i" (EXCEPTION_FRAME_SIZE) \ |
---|
| 649 | : "memory") |
---|
| 650 | |
---|
| 651 | /* |
---|
| 652 | * FPU entry. Conditionally D16 or D32 support. |
---|
| 653 | */ |
---|
| 654 | #ifdef ARM_MULTILIB_VFP |
---|
| 655 | #ifdef ARM_MULTILIB_VFP_D32 |
---|
| 656 | #define FPU_ENTRY_VFP_D32 \ |
---|
| 657 | "vstmia r5!, {d16-d31}\n" |
---|
| 658 | #else /* ARM_MULTILIB_VFP_D32 */ |
---|
| 659 | #define FPU_ENTRY_VFP_D32 \ |
---|
| 660 | "mov r3, #0\n" \ |
---|
| 661 | "mov r4, #0\n" \ |
---|
| 662 | "adds r6, r5, #128\n" \ |
---|
| 663 | "3:\n" \ |
---|
| 664 | "stmia r5!, {r3-r4}\n" \ |
---|
| 665 | "cmp r5, r6\n" \ |
---|
| 666 | "bne 3b\n" |
---|
| 667 | #endif /* ARM_MULTILIB_VFP_D32 */ |
---|
| 668 | #define EXCEPTION_ENTRY_FPU(frame_fpu_size) \ |
---|
| 669 | "sub sp, %[frame_fpu_size]\n" /* size includes alignment size */ \ |
---|
| 670 | "add r5, sp, #4\n" /* up to align down */ \ |
---|
| 671 | "bic r5, r5, #7\n" /* align the FPU frame */ \ |
---|
| 672 | "str r5, [r2]\n" /* store the FPU frame pointer */ \ |
---|
| 673 | "vmrs r3, FPEXC\n" \ |
---|
| 674 | "vmrs r4, FPSCR\n" \ |
---|
| 675 | "stmia r5!, {r3-r4}\n" \ |
---|
| 676 | "vstmia r5!, {d0-d15}\n" \ |
---|
| 677 | FPU_ENTRY_VFP_D32 |
---|
| 678 | #else /* ARM_MULTILIB_VFP */ |
---|
| 679 | #define EXCEPTION_ENTRY_FPU(frame_fpu_size) |
---|
| 680 | #endif /* ARM_MULTILIB_VFP */ |
---|
| 681 | |
---|
| 682 | #define EXCEPTION_ENTRY_THREAD(_frame) \ |
---|
| 683 | __asm__ volatile( \ |
---|
| 684 | ASM_ARM_MODE \ |
---|
| 685 | "ldr lr, [sp]\n" /* recover the link reg */ \ |
---|
| 686 | "add sp, #4\n" \ |
---|
| 687 | "add r0, sp, %[r0_r12_size]\n" /* get the sp in the frame */ \ |
---|
| 688 | "mrs r1, spsr\n" /* get the saved sr */ \ |
---|
| 689 | "mov r6, r1\n" /* stash it for later */ \ |
---|
| 690 | "bic r1, r1, %[psr_t]\n" /* clear thumb mode, not sure? */ \ |
---|
| 691 | "orr r1, r1, %[psr_i]\n" /* mask irqs */ \ |
---|
| 692 | "mrs r2, cpsr\n" /* get the current sr */ \ |
---|
| 693 | "str r2, [sp, %[frame_cpsr]]\n" /* save for exc return */ \ |
---|
| 694 | "msr cpsr, r1\n" /* switch to user mode */ \ |
---|
| 695 | "mov r3, sp\n" /* get the stack pointer */ \ |
---|
| 696 | "mov r4, lr\n" /* get the link reg */ \ |
---|
| 697 | "msr cpsr, r2\n" /* back to exc mode */ \ |
---|
| 698 | "mov r5, lr\n" /* get the PRA */ \ |
---|
| 699 | "stm r0, {r3-r6}\n" /* save into the frame */ \ |
---|
| 700 | "sub r4, r3, %[frame_size]\n" /* destination address */ \ |
---|
| 701 | "mov r6, r4\n" /* save the frame */ \ |
---|
| 702 | "sub r4, #1\n" /* one before the start */ \ |
---|
| 703 | "add r3, #1\n" /* one past the end */ \ |
---|
| 704 | "sub r5, sp, #1\n" /* source address */ \ |
---|
| 705 | "1:\n" \ |
---|
| 706 | "ldrb r0, [r5, #1]!\n" /* get a byte */ \ |
---|
| 707 | "strb r0, [r4, #1]!\n" /* put the byte */ \ |
---|
| 708 | "cmp r3, r4\n" /* the end? */ \ |
---|
| 709 | "bne 1b\n" \ |
---|
| 710 | "add sp, %[frame_size]\n" /* free the frame and CPSR */ \ |
---|
| 711 | "mrs r1, spsr\n" /* get the thread's saved sr */ \ |
---|
| 712 | "orr r2, r1, %[psr_i]\n" /* mask irqs */ \ |
---|
| 713 | "msr cpsr, r2\n" /* switch back to the thread's context */ \ |
---|
| 714 | "sub sp, %[frame_size]\n" /* alloc in the thread stack */ \ |
---|
| 715 | "mov %[o_frame], sp\n" /* save the frame */ \ |
---|
| 716 | "add r2, sp, %[o_frame_fpu]\n" /* get the FPU offset */ \ |
---|
| 717 | "mov r3, #0\n" \ |
---|
| 718 | "str r3, [r2]\n" /* clear the FPU frame pointer */ \ |
---|
| 719 | EXCEPTION_ENTRY_FPU(frame_fpu_size) \ |
---|
[b53ad46] | 720 | "bic r1, r1, %[psr_i]\n" /* clear irq mask, debug checks */ \ |
---|
| 721 | "msr cpsr, r1\n" /* restore the state with irq mask clear */ \ |
---|
[a0d4e99] | 722 | ASM_THUMB_MODE \ |
---|
[e629076] | 723 | : ARM_SWITCH_REG_ASM, \ |
---|
[a0d4e99] | 724 | [o_frame] "=r" (_frame) \ |
---|
| 725 | : [psr_t] "i" (ARM_PSR_T), \ |
---|
| 726 | [psr_i] "i" (ARM_PSR_I), \ |
---|
| 727 | [r0_r12_size] "i" (13 * sizeof(uint32_t)), \ |
---|
| 728 | [frame_cpsr] "i" (EXCEPTION_FRAME_SIZE - sizeof(uint32_t)), \ |
---|
| 729 | [frame_size] "i" (EXCEPTION_FRAME_SIZE), \ |
---|
| 730 | [o_frame_fpu] "i" (EXCEPTION_FRAME_FPU_OFFSET), \ |
---|
| 731 | [frame_fpu_size] "i" (EXCEPTION_FRAME_FPU_SIZE + 4) \ |
---|
| 732 | : "r0", "r1", "r2", "r3", "r4", "r5", "r6", "memory") |
---|
| 733 | |
---|
| 734 | /* |
---|
| 735 | * FPU exit. Conditionally D16 or D32 support. |
---|
| 736 | */ |
---|
| 737 | #ifdef ARM_MULTILIB_VFP |
---|
| 738 | #ifdef ARM_MULTILIB_VFP_D32 |
---|
| 739 | #define FPU_EXIT_VFP_D32 \ |
---|
| 740 | "vldmia r0, {d16-d31}\n" |
---|
| 741 | #else /* ARM_MULTILIB_VFP_D32 */ |
---|
| 742 | #define FPU_EXIT_VFP_D32 |
---|
| 743 | #endif /* ARM_MULTILIB_VFP_D32 */ |
---|
| 744 | #define EXCEPTION_EXIT_FPU(frame_fpu_size) \ |
---|
| 745 | "ldmia r0!, {r1-r2}\n" \ |
---|
| 746 | "vldmia r0!, {d0-d15}\n" \ |
---|
| 747 | FPU_EXIT_VFP_D32 \ |
---|
| 748 | "vmsr FPEXC, r1\n" \ |
---|
| 749 | "vmsr FPSCR, r2\n" \ |
---|
| 750 | "add sp, %[frame_fpu_size]\n" /* size includes alignment size */ |
---|
| 751 | #else /* ARM_MULTILIB_VFP */ |
---|
| 752 | #define EXCEPTION_EXIT_FPU(frame_fpu_size) |
---|
| 753 | #endif /* ARM_MULTILIB_VFP */ |
---|
| 754 | |
---|
| 755 | /** |
---|
| 756 | * Exception exit. |
---|
| 757 | * |
---|
| 758 | * The thread is to be resumed so we are still in the thread's mode. Copy the |
---|
| 759 | * exception frame from the thread's stack back to the exception's stack and |
---|
| 760 | * restore the thread's context before returning from the exception to the |
---|
| 761 | * thread. |
---|
| 762 | * |
---|
| 763 | * Note, the code currently assumes cp15 has been set up to match the |
---|
| 764 | * instruction set being used. |
---|
| 765 | */ |
---|
| 766 | #define EXCEPTION_EXIT_THREAD(_frame) \ |
---|
| 767 | __asm__ volatile( \ |
---|
| 768 | ASM_ARM_MODE \ |
---|
| 769 | "mov r0, %[i_frame]\n" /* get the frame */ \ |
---|
| 770 | "ldr r0, [r0, %[frame_fpu]]\n" /* recover FPU frame pointer */ \ |
---|
| 771 | EXCEPTION_EXIT_FPU(frame_fpu_size) \ |
---|
| 772 | "ldr r2, [sp, %[frame_cpsr]]\n" /* recover exc CPSR from thread */ \ |
---|
| 773 | "mov r0, sp\n" /* get the thread frame pointer */ \ |
---|
| 774 | "msr cpsr, r2\n" /* switch back to the exc's context */ \ |
---|
| 775 | "add r3, sp, #1\n" /* get the end */ \ |
---|
| 776 | "sub sp, %[frame_size]\n" /* alloc the frame */ \ |
---|
| 777 | "sub r4, sp, #1\n" /* destination address */ \ |
---|
| 778 | "sub r5, r0, #1\n" /* source address */ \ |
---|
| 779 | "1:\n" \ |
---|
| 780 | "ldrb r1, [r5, #1]!\n" /* get a byte */ \ |
---|
| 781 | "strb r1, [r4, #1]!\n" /* put the byte */ \ |
---|
| 782 | "cmp r3, r4\n" /* the end? */ \ |
---|
| 783 | "bne 1b\n" \ |
---|
| 784 | "add r1, r0, %[r0_r12_size]\n" /* get the sp in the frame */ \ |
---|
| 785 | "ldm r1, {r3-r6}\n" /* recover from the frame */ \ |
---|
| 786 | "orr r1, r6, %[psr_i]\n" /* get the thread's psr and mask irqs */ \ |
---|
| 787 | "msr cpsr, r1\n" /* switch to user mode */ \ |
---|
| 788 | "mov sp, r3\n" /* set the stack pointer */ \ |
---|
| 789 | "mov lr, r4\n" /* set the link reg */ \ |
---|
| 790 | "msr cpsr, r2\n" /* switch back to the exc's context */ \ |
---|
| 791 | "msr spsr, r6\n" /* set the thread's CPSR */ \ |
---|
| 792 | "sub sp, #4\n" \ |
---|
| 793 | "mov lr, r5\n" /* get the PC */ \ |
---|
| 794 | "str lr, [sp]\n" /* save the link reg */ \ |
---|
| 795 | ASM_THUMB_MODE \ |
---|
[e629076] | 796 | : ARM_SWITCH_REG_ASM \ |
---|
[a0d4e99] | 797 | : [psr_i] "i" (ARM_PSR_I), \ |
---|
| 798 | [r0_r12_size] "i" (13 * sizeof(uint32_t)), \ |
---|
| 799 | [frame_cpsr] "i" (EXCEPTION_FRAME_SIZE - sizeof(uint32_t)), \ |
---|
| 800 | [frame_size] "i" (EXCEPTION_FRAME_SIZE), \ |
---|
| 801 | [frame_fpu] "i" (EXCEPTION_FRAME_FPU_OFFSET), \ |
---|
| 802 | [frame_fpu_size] "i" (EXCEPTION_FRAME_FPU_SIZE + 4), \ |
---|
| 803 | [i_frame] "r" (_frame) \ |
---|
| 804 | : "r0", "r1", "r2", "r3", "r4", "r5", "r6", "memory") |
---|
| 805 | |
---|
| 806 | #define EXCEPTION_EXIT_EXC() \ |
---|
| 807 | __asm__ volatile( \ |
---|
| 808 | ASM_ARM_MODE \ |
---|
| 809 | "ldr lr, [sp]\n" /* recover the link reg */ \ |
---|
| 810 | "add sp, #4\n" \ |
---|
| 811 | "ldm sp, {r0-r12}\n" /* restore the trhead's context */ \ |
---|
| 812 | "add sp, %[frame_size]\n" /* free the frame */ \ |
---|
| 813 | "subs pc, lr, #0\n" /* return from the exc */ \ |
---|
| 814 | : \ |
---|
| 815 | : [frame_size] "i" (EXCEPTION_FRAME_SIZE) \ |
---|
| 816 | : "memory") |
---|
| 817 | |
---|
| 818 | |
---|
| 819 | static void __attribute__((naked)) |
---|
| 820 | target_exception_undefined_instruction(void) |
---|
| 821 | { |
---|
| 822 | CPU_Exception_frame* frame; |
---|
| 823 | ARM_SWITCH_REG; |
---|
| 824 | EXCEPTION_ENTRY_EXC(); |
---|
| 825 | arm_debug_break_unload(); |
---|
| 826 | EXCEPTION_ENTRY_THREAD(frame); |
---|
| 827 | frame->vector = 1; |
---|
| 828 | target_exception(frame); |
---|
| 829 | EXCEPTION_EXIT_THREAD(frame); |
---|
| 830 | arm_debug_break_load(); |
---|
| 831 | EXCEPTION_EXIT_EXC(); |
---|
| 832 | } |
---|
| 833 | |
---|
| 834 | static void __attribute__((naked)) |
---|
| 835 | target_exception_supervisor_call(void) |
---|
| 836 | { |
---|
| 837 | CPU_Exception_frame* frame; |
---|
| 838 | ARM_SWITCH_REG; |
---|
| 839 | /* |
---|
| 840 | * The PC offset needs to be review so we move past a svc instruction. This |
---|
| 841 | * can then used as a user breakpoint. The issue is this exception is used by |
---|
| 842 | * the BKPT instruction in the prefetch abort handler to signal a TRAP. |
---|
| 843 | */ |
---|
| 844 | EXCEPTION_ENTRY_EXC(); |
---|
| 845 | arm_debug_break_unload(); |
---|
| 846 | EXCEPTION_ENTRY_THREAD(frame); |
---|
| 847 | frame->vector = 2; |
---|
| 848 | target_exception(frame); |
---|
| 849 | EXCEPTION_EXIT_THREAD(frame); |
---|
| 850 | arm_debug_break_load(); |
---|
| 851 | EXCEPTION_EXIT_EXC(); |
---|
| 852 | } |
---|
| 853 | |
---|
| 854 | static void __attribute__((naked)) |
---|
| 855 | target_exception_prefetch_abort(void) |
---|
| 856 | { |
---|
| 857 | CPU_Exception_frame* frame; |
---|
| 858 | ARM_SWITCH_REG; |
---|
| 859 | EXCEPTION_ENTRY_EXC(); |
---|
| 860 | arm_debug_break_unload(); |
---|
| 861 | EXCEPTION_ENTRY_THREAD(frame); |
---|
[e629076] | 862 | #if ARM_CP15 |
---|
[a0d4e99] | 863 | if ((arm_cp15_get_instruction_fault_status() & 0x1f) == 0x02) |
---|
| 864 | frame->vector = 2; |
---|
| 865 | else |
---|
| 866 | frame->vector = 3; |
---|
[e629076] | 867 | #else |
---|
| 868 | frame->vector = 3; |
---|
| 869 | #endif |
---|
[a0d4e99] | 870 | target_exception(frame); |
---|
| 871 | EXCEPTION_EXIT_THREAD(frame); |
---|
| 872 | arm_debug_break_load(); |
---|
| 873 | EXCEPTION_EXIT_EXC(); |
---|
| 874 | } |
---|
| 875 | |
---|
| 876 | static void __attribute__((naked)) |
---|
| 877 | target_exception_data_abort(void) |
---|
| 878 | { |
---|
| 879 | CPU_Exception_frame* frame; |
---|
| 880 | ARM_SWITCH_REG; |
---|
| 881 | EXCEPTION_ENTRY_EXC(); |
---|
| 882 | arm_debug_break_unload(); |
---|
| 883 | EXCEPTION_ENTRY_THREAD(frame); |
---|
| 884 | frame->vector = 4; |
---|
| 885 | target_exception(frame); |
---|
| 886 | EXCEPTION_EXIT_THREAD(frame); |
---|
| 887 | arm_debug_break_load(); |
---|
| 888 | EXCEPTION_EXIT_EXC(); |
---|
| 889 | } |
---|
| 890 | |
---|
[e629076] | 891 | #if ARM_CP15 |
---|
| 892 | /** |
---|
| 893 | * The init value for the text section. |
---|
| 894 | */ |
---|
| 895 | static uint32_t text_section_flags; |
---|
| 896 | |
---|
| 897 | static void |
---|
| 898 | rtems_debugger_target_set_vectors(void) |
---|
[a0d4e99] | 899 | { |
---|
[e629076] | 900 | void* text_begin; |
---|
| 901 | void* text_end; |
---|
[a0d4e99] | 902 | text_begin = &bsp_section_text_begin[0]; |
---|
| 903 | text_end = &bsp_section_text_end[0]; |
---|
| 904 | text_section_flags = |
---|
| 905 | arm_cp15_set_translation_table_entries(text_begin, |
---|
| 906 | text_end, |
---|
| 907 | ARMV7_MMU_DATA_READ_WRITE_CACHED); |
---|
| 908 | arm_cp15_set_exception_handler(ARM_EXCEPTION_UNDEF, |
---|
| 909 | target_exception_undefined_instruction); |
---|
| 910 | arm_cp15_set_exception_handler(ARM_EXCEPTION_SWI, |
---|
| 911 | target_exception_supervisor_call); |
---|
| 912 | arm_cp15_set_exception_handler(ARM_EXCEPTION_PREF_ABORT, |
---|
| 913 | target_exception_prefetch_abort); |
---|
| 914 | arm_cp15_set_exception_handler(ARM_EXCEPTION_DATA_ABORT, |
---|
| 915 | target_exception_data_abort); |
---|
[e629076] | 916 | } |
---|
| 917 | #else |
---|
| 918 | static void |
---|
| 919 | rtems_debugger_target_set_vectors(void) |
---|
| 920 | { |
---|
| 921 | /* |
---|
| 922 | * Dummy, please add support for your ARM variant. |
---|
| 923 | */ |
---|
| 924 | void* ui = target_exception_undefined_instruction; |
---|
| 925 | void* sc = target_exception_supervisor_call; |
---|
| 926 | void* pa = target_exception_prefetch_abort; |
---|
| 927 | void* da = target_exception_data_abort; |
---|
| 928 | (void) ui; |
---|
| 929 | (void) sc; |
---|
| 930 | (void) pa; |
---|
| 931 | (void) da; |
---|
| 932 | } |
---|
| 933 | #endif |
---|
| 934 | |
---|
| 935 | int |
---|
| 936 | rtems_debugger_target_enable(void) |
---|
| 937 | { |
---|
| 938 | rtems_interrupt_lock_context lock_context; |
---|
| 939 | debug_session_active = true; |
---|
| 940 | rtems_interrupt_lock_acquire(&target_lock, &lock_context); |
---|
| 941 | arm_debug_break_unload(); |
---|
| 942 | arm_debug_break_clear(); |
---|
| 943 | rtems_debugger_target_set_vectors(); |
---|
[a0d4e99] | 944 | rtems_interrupt_lock_release(&target_lock, &lock_context); |
---|
| 945 | return 0; |
---|
| 946 | } |
---|
| 947 | |
---|
| 948 | int |
---|
| 949 | rtems_debugger_target_disable(void) |
---|
| 950 | { |
---|
| 951 | rtems_interrupt_lock_context lock_context; |
---|
| 952 | #if DOES_NOT_WORK |
---|
| 953 | void* text_begin; |
---|
| 954 | void* text_end; |
---|
| 955 | #endif |
---|
| 956 | rtems_interrupt_lock_acquire(&target_lock, &lock_context); |
---|
| 957 | debug_session_active = false; |
---|
| 958 | #if DOES_NOT_WORK |
---|
| 959 | text_begin = &bsp_section_text_begin[0]; |
---|
| 960 | text_end = &bsp_section_text_end[0]; |
---|
| 961 | arm_cp15_set_translation_table_entries(text_begin, |
---|
| 962 | text_end, |
---|
| 963 | text_section_flags); |
---|
| 964 | #endif |
---|
| 965 | rtems_interrupt_lock_release(&target_lock, &lock_context); |
---|
| 966 | return 0; |
---|
| 967 | } |
---|
| 968 | |
---|
| 969 | int |
---|
| 970 | rtems_debugger_target_read_regs(rtems_debugger_thread* thread) |
---|
| 971 | { |
---|
| 972 | if (!rtems_debugger_thread_flag(thread, |
---|
| 973 | RTEMS_DEBUGGER_THREAD_FLAG_REG_VALID)) { |
---|
| 974 | static const uint32_t good_address = (uint32_t) &good_address; |
---|
| 975 | uint32_t* regs = &thread->registers[0]; |
---|
| 976 | int i; |
---|
| 977 | |
---|
| 978 | for (i = 0; i < RTEMS_DEBUGGER_NUMREGS; ++i) |
---|
| 979 | regs[i] = (uint32_t) &good_address; |
---|
| 980 | |
---|
| 981 | if (thread->frame) { |
---|
| 982 | CPU_Exception_frame* frame = thread->frame; |
---|
| 983 | |
---|
| 984 | /* |
---|
| 985 | * Assume interrupts are not masked and if masked set them to the saved |
---|
| 986 | * value. |
---|
| 987 | */ |
---|
| 988 | FRAME_SR &= ~CPSR_INTS_MASK; |
---|
| 989 | |
---|
| 990 | if (rtems_debugger_thread_flag(thread, |
---|
| 991 | RTEMS_DEBUGGER_THREAD_FLAG_INTS_DISABLED)) { |
---|
| 992 | FRAME_SR |= |
---|
| 993 | (thread->flags >> RTEMS_DEBUGGER_THREAD_FLAG_TARGET_BASE) & CPSR_INTS_MASK; |
---|
| 994 | thread->flags = ~RTEMS_DEBUGGER_THREAD_FLAG_INTS_DISABLED; |
---|
| 995 | } |
---|
| 996 | |
---|
| 997 | regs[REG_R0] = frame->register_r0; |
---|
| 998 | regs[REG_R1] = frame->register_r1; |
---|
| 999 | regs[REG_R2] = frame->register_r2; |
---|
| 1000 | regs[REG_R3] = frame->register_r3; |
---|
| 1001 | regs[REG_R4] = frame->register_r4; |
---|
| 1002 | regs[REG_R5] = frame->register_r5; |
---|
| 1003 | regs[REG_R6] = frame->register_r6; |
---|
| 1004 | regs[REG_R7] = frame->register_r7; |
---|
| 1005 | regs[REG_R8] = frame->register_r8; |
---|
| 1006 | regs[REG_R9] = frame->register_r9; |
---|
| 1007 | regs[REG_R10] = frame->register_r10; |
---|
| 1008 | regs[REG_R11] = frame->register_r11; |
---|
| 1009 | regs[REG_R12] = frame->register_r12; |
---|
| 1010 | regs[REG_SP] = frame->register_sp; |
---|
| 1011 | regs[REG_LR] = (uint32_t) frame->register_lr; |
---|
| 1012 | regs[REG_PC] = (uint32_t) frame->register_pc; |
---|
| 1013 | regs[REG_CPSR] = FRAME_SR; |
---|
| 1014 | /* |
---|
| 1015 | * Get the signal from the frame. |
---|
| 1016 | */ |
---|
| 1017 | thread->signal = rtems_debugger_target_exception_to_signal(frame); |
---|
| 1018 | } |
---|
| 1019 | else { |
---|
| 1020 | #if defined(ARM_MULTILIB_ARCH_V4) |
---|
| 1021 | regs[REG_R4] = thread->tcb->Registers.register_r4; |
---|
| 1022 | regs[REG_R5] = thread->tcb->Registers.register_r5; |
---|
| 1023 | regs[REG_R6] = thread->tcb->Registers.register_r6; |
---|
| 1024 | regs[REG_R7] = thread->tcb->Registers.register_r7; |
---|
| 1025 | regs[REG_R8] = thread->tcb->Registers.register_r8; |
---|
| 1026 | regs[REG_R9] = thread->tcb->Registers.register_r9; |
---|
| 1027 | regs[REG_R10] = thread->tcb->Registers.register_r10; |
---|
| 1028 | regs[REG_R11] = thread->tcb->Registers.register_fp; |
---|
| 1029 | regs[REG_LR] = (intptr_t) thread->tcb->Registers.register_lr; |
---|
| 1030 | regs[REG_PC] = (intptr_t) thread->tcb->Registers.register_lr; |
---|
| 1031 | regs[REG_SP] = (intptr_t) thread->tcb->Registers.register_sp; |
---|
| 1032 | #elif defined(ARM_MULTILIB_ARCH_V7M) |
---|
| 1033 | regs[REG_R4] = thread->tcb->Registers.register_r4; |
---|
| 1034 | regs[REG_R5] = thread->tcb->Registers.register_r5; |
---|
| 1035 | regs[REG_R6] = thread->tcb->Registers.register_r6; |
---|
| 1036 | regs[REG_R7] = thread->tcb->Registers.register_r7; |
---|
| 1037 | regs[REG_R8] = thread->tcb->Registers.register_r8; |
---|
| 1038 | regs[REG_R9] = thread->tcb->Registers.register_r9; |
---|
| 1039 | regs[REG_R10] = thread->tcb->Registers.register_r10; |
---|
| 1040 | regs[REG_R11] = thread->tcb->Registers.register_r11; |
---|
| 1041 | regs[REG_LR] = (intptr_t) thread->tcb->Registers.register_lr; |
---|
| 1042 | regs[REG_PC] = (intptr_t) thread->tcb->Registers.register_lr; |
---|
| 1043 | regs[REG_SP] = (intptr_t) thread->tcb->Registers.register_sp; |
---|
| 1044 | #endif |
---|
| 1045 | /* |
---|
| 1046 | * Blocked threads have no signal. |
---|
| 1047 | */ |
---|
| 1048 | thread->signal = 0; |
---|
| 1049 | } |
---|
| 1050 | |
---|
| 1051 | thread->flags |= RTEMS_DEBUGGER_THREAD_FLAG_REG_VALID; |
---|
| 1052 | thread->flags &= ~RTEMS_DEBUGGER_THREAD_FLAG_REG_DIRTY; |
---|
| 1053 | } |
---|
| 1054 | |
---|
| 1055 | return 0; |
---|
| 1056 | } |
---|
| 1057 | |
---|
| 1058 | int |
---|
| 1059 | rtems_debugger_target_write_regs(rtems_debugger_thread* thread) |
---|
| 1060 | { |
---|
| 1061 | if (rtems_debugger_thread_flag(thread, |
---|
| 1062 | RTEMS_DEBUGGER_THREAD_FLAG_REG_DIRTY)) { |
---|
| 1063 | uint32_t* regs = &thread->registers[0]; |
---|
| 1064 | |
---|
| 1065 | /* |
---|
| 1066 | * Only write to debugger controlled threads. Do not touch the registers |
---|
| 1067 | * for threads blocked in the context switcher. |
---|
| 1068 | */ |
---|
| 1069 | if (rtems_debugger_thread_flag(thread, |
---|
| 1070 | RTEMS_DEBUGGER_THREAD_FLAG_DEBUGGING)) { |
---|
| 1071 | CPU_Exception_frame* frame = thread->frame; |
---|
| 1072 | frame->register_r0 = regs[REG_R0]; |
---|
| 1073 | frame->register_r1 = regs[REG_R1]; |
---|
| 1074 | frame->register_r2 = regs[REG_R2]; |
---|
| 1075 | frame->register_r3 = regs[REG_R3]; |
---|
| 1076 | frame->register_r4 = regs[REG_R4]; |
---|
| 1077 | frame->register_r5 = regs[REG_R5]; |
---|
| 1078 | frame->register_r6 = regs[REG_R6]; |
---|
| 1079 | frame->register_r7 = regs[REG_R7]; |
---|
| 1080 | frame->register_r8 = regs[REG_R8]; |
---|
| 1081 | frame->register_r9 = regs[REG_R9]; |
---|
| 1082 | frame->register_r10 = regs[REG_R10]; |
---|
| 1083 | frame->register_r11 = regs[REG_R11]; |
---|
| 1084 | frame->register_r12 = regs[REG_R12]; |
---|
| 1085 | frame->register_sp = regs[REG_SP]; |
---|
| 1086 | frame->register_lr = (void*) regs[REG_LR]; |
---|
| 1087 | frame->register_pc = (void*) regs[REG_PC]; |
---|
| 1088 | FRAME_SR = regs[REG_CPSR]; |
---|
| 1089 | } |
---|
| 1090 | thread->flags &= ~RTEMS_DEBUGGER_THREAD_FLAG_REG_DIRTY; |
---|
| 1091 | } |
---|
| 1092 | return 0; |
---|
| 1093 | } |
---|
| 1094 | |
---|
| 1095 | DB_UINT |
---|
| 1096 | rtems_debugger_target_reg_pc(rtems_debugger_thread* thread) |
---|
| 1097 | { |
---|
| 1098 | int r; |
---|
| 1099 | r = rtems_debugger_target_read_regs(thread); |
---|
| 1100 | if (r >= 0) { |
---|
| 1101 | uint32_t* regs = &thread->registers[0]; |
---|
| 1102 | return regs[REG_PC]; |
---|
| 1103 | } |
---|
| 1104 | return 0; |
---|
| 1105 | } |
---|
| 1106 | |
---|
| 1107 | DB_UINT |
---|
| 1108 | rtems_debugger_target_frame_pc(CPU_Exception_frame* frame) |
---|
| 1109 | { |
---|
| 1110 | return (DB_UINT) frame->register_pc; |
---|
| 1111 | } |
---|
| 1112 | |
---|
| 1113 | DB_UINT |
---|
| 1114 | rtems_debugger_target_reg_sp(rtems_debugger_thread* thread) |
---|
| 1115 | { |
---|
| 1116 | int r; |
---|
| 1117 | r = rtems_debugger_target_read_regs(thread); |
---|
| 1118 | if (r >= 0) { |
---|
| 1119 | uint32_t* regs = &thread->registers[0]; |
---|
| 1120 | return regs[REG_SP]; |
---|
| 1121 | } |
---|
| 1122 | return 0; |
---|
| 1123 | } |
---|
| 1124 | |
---|
| 1125 | DB_UINT |
---|
| 1126 | rtems_debugger_target_tcb_sp(rtems_debugger_thread* thread) |
---|
| 1127 | { |
---|
| 1128 | return (DB_UINT) thread->tcb->Registers.register_sp; |
---|
| 1129 | } |
---|
| 1130 | |
---|
| 1131 | int |
---|
| 1132 | rtems_debugger_target_thread_stepping(rtems_debugger_thread* thread) |
---|
| 1133 | { |
---|
| 1134 | if (rtems_debugger_thread_flag(thread, |
---|
| 1135 | (RTEMS_DEBUGGER_THREAD_FLAG_STEP | |
---|
| 1136 | RTEMS_DEBUGGER_THREAD_FLAG_STEPPING))) { |
---|
| 1137 | /* |
---|
| 1138 | * Single stepping and range stepping uses hardware debug breakpoint |
---|
| 1139 | * 0. This is reserved for single stepping. |
---|
| 1140 | */ |
---|
| 1141 | CPU_Exception_frame* frame = thread->frame; |
---|
| 1142 | arm_debug_hwbreak* bp = &hw_breaks[0]; |
---|
| 1143 | int i; |
---|
| 1144 | for (i = 0; i < hw_breakpoints; ++i, ++bp) { |
---|
| 1145 | if (!bp->enabled) { |
---|
| 1146 | const uint32_t addr = (intptr_t) frame->register_pc; |
---|
| 1147 | const bool thumb = (FRAME_SR & (1 << 5)) != 0 ? true : false; |
---|
| 1148 | uint32_t bas; |
---|
| 1149 | |
---|
| 1150 | bp->enabled = true; |
---|
| 1151 | bp->loaded = false; |
---|
| 1152 | bp->address = frame->register_pc; |
---|
| 1153 | bp->frame = frame; |
---|
| 1154 | bp->length = sizeof(uint32_t); |
---|
| 1155 | |
---|
| 1156 | if (thumb) { |
---|
| 1157 | uint16_t instr = *((uint16_t*) frame->register_pc); |
---|
| 1158 | switch (instr & 0xf800) { |
---|
| 1159 | case 0xe800: |
---|
| 1160 | case 0xf000: |
---|
| 1161 | case 0xf800: |
---|
| 1162 | break; |
---|
| 1163 | default: |
---|
| 1164 | bp->length = sizeof(uint16_t); |
---|
| 1165 | break; |
---|
| 1166 | } |
---|
| 1167 | } |
---|
| 1168 | |
---|
| 1169 | /* |
---|
| 1170 | * See table C3-2 Effect of byte address selection on Breakpoint |
---|
| 1171 | * generation and "Instruction address comparisoin programming |
---|
| 1172 | * examples. |
---|
| 1173 | */ |
---|
| 1174 | if (thumb) { |
---|
| 1175 | if ((addr & (1 << 1)) == 0) { |
---|
| 1176 | bas = 0x3; /* b0011 */ |
---|
| 1177 | } |
---|
| 1178 | else { |
---|
| 1179 | bas = 0xc; /* b1100 */ |
---|
| 1180 | } |
---|
| 1181 | } |
---|
| 1182 | else { |
---|
| 1183 | bas = 0xf; /* b1111 */ |
---|
| 1184 | } |
---|
| 1185 | |
---|
| 1186 | arm_debug_break_setup(bp, |
---|
| 1187 | addr & ~0x3, |
---|
| 1188 | ARM_HW_BP_UNLINKED_INSTR_MISMATCH, |
---|
| 1189 | bas, |
---|
| 1190 | ARM_HW_BP_PRIV_PL0_SUP_SYS); |
---|
| 1191 | |
---|
| 1192 | /* |
---|
| 1193 | * Save the interrupt state before stepping if set. |
---|
| 1194 | */ |
---|
[e629076] | 1195 | #if ARM_PSR_HAS_INT_MASK |
---|
[a0d4e99] | 1196 | if ((FRAME_SR & CPSR_INTS_MASK) != 0) { |
---|
| 1197 | uint32_t int_state; |
---|
| 1198 | int_state = |
---|
| 1199 | (frame->register_cpsr & CPSR_INTS_MASK) << RTEMS_DEBUGGER_THREAD_FLAG_TARGET_BASE; |
---|
| 1200 | thread->flags |= RTEMS_DEBUGGER_THREAD_FLAG_INTS_DISABLED | int_state; |
---|
| 1201 | } |
---|
| 1202 | /* |
---|
| 1203 | * Mask the interrupt when stepping. |
---|
| 1204 | */ |
---|
| 1205 | FRAME_SR |= CPSR_INTS_MASK; |
---|
[e629076] | 1206 | #endif |
---|
[a0d4e99] | 1207 | break; |
---|
| 1208 | } |
---|
| 1209 | } |
---|
| 1210 | } |
---|
| 1211 | return 0; |
---|
| 1212 | } |
---|
| 1213 | |
---|
| 1214 | int |
---|
| 1215 | rtems_debugger_target_exception_to_signal(CPU_Exception_frame* frame) |
---|
| 1216 | { |
---|
| 1217 | int sig = RTEMS_DEBUGGER_SIGNAL_HUP; |
---|
[e629076] | 1218 | #if defined(ARM_EXCEPTION_RESET) |
---|
[a0d4e99] | 1219 | switch (frame->vector) { |
---|
| 1220 | case ARM_EXCEPTION_RESET: |
---|
| 1221 | case ARM_EXCEPTION_SWI: |
---|
| 1222 | sig = RTEMS_DEBUGGER_SIGNAL_TRAP; |
---|
| 1223 | break; |
---|
| 1224 | case ARM_EXCEPTION_UNDEF: |
---|
| 1225 | sig = RTEMS_DEBUGGER_SIGNAL_ILL; |
---|
| 1226 | break; |
---|
| 1227 | case ARM_EXCEPTION_FIQ: |
---|
| 1228 | sig = RTEMS_DEBUGGER_SIGNAL_FPE; |
---|
| 1229 | break; |
---|
| 1230 | case ARM_EXCEPTION_PREF_ABORT: |
---|
| 1231 | case ARM_EXCEPTION_DATA_ABORT: |
---|
| 1232 | sig = RTEMS_DEBUGGER_SIGNAL_SEGV; |
---|
| 1233 | break; |
---|
| 1234 | case ARM_EXCEPTION_RESERVED: |
---|
| 1235 | case ARM_EXCEPTION_IRQ: |
---|
| 1236 | sig = RTEMS_DEBUGGER_SIGNAL_BUS; |
---|
| 1237 | break; |
---|
| 1238 | default: |
---|
| 1239 | break; |
---|
| 1240 | } |
---|
[e629076] | 1241 | #endif |
---|
[a0d4e99] | 1242 | return sig; |
---|
| 1243 | } |
---|
| 1244 | |
---|
| 1245 | int |
---|
| 1246 | rtems_debugger_target_hwbreak_control(rtems_debugger_target_watchpoint wp, |
---|
| 1247 | bool insert, |
---|
| 1248 | DB_UINT addr, |
---|
| 1249 | DB_UINT kind) |
---|
| 1250 | { |
---|
| 1251 | /* |
---|
| 1252 | * To do. |
---|
| 1253 | */ |
---|
| 1254 | return 0; |
---|
| 1255 | } |
---|
| 1256 | |
---|
| 1257 | int |
---|
| 1258 | rtems_debugger_target_cache_sync(rtems_debugger_target_swbreak* swbreak) |
---|
| 1259 | { |
---|
| 1260 | /* |
---|
| 1261 | * Flush the data cache and invalidate the instruction cache. |
---|
| 1262 | */ |
---|
| 1263 | rtems_cache_flush_multiple_data_lines(swbreak->address, |
---|
| 1264 | sizeof(breakpoint)); |
---|
| 1265 | rtems_cache_invalidate_multiple_instruction_lines(swbreak->address, |
---|
| 1266 | sizeof(breakpoint)); |
---|
| 1267 | return 0; |
---|
| 1268 | } |
---|