Gabe Black | a799151 | 2013-12-07 04:25:01 -0800 | [diff] [blame] | 1 | /* |
| 2 | * This file is part of the libpayload project. |
| 3 | * |
| 4 | * Copyright 2013 Google Inc. |
| 5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions |
| 8 | * are met: |
| 9 | * 1. Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * 2. 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 | * 3. 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 AND CONTRIBUTORS ``AS IS'' AND |
| 18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 27 | * SUCH DAMAGE. |
| 28 | */ |
| 29 | |
Gabe Black | 20cdb24 | 2013-12-11 00:23:15 -0800 | [diff] [blame] | 30 | #include <arch/exception.h> |
Gabe Black | a799151 | 2013-12-07 04:25:01 -0800 | [diff] [blame] | 31 | #include <exception.h> |
| 32 | #include <libpayload.h> |
| 33 | #include <stdint.h> |
| 34 | |
Julius Werner | 092cac5 | 2014-05-15 19:41:52 -0700 | [diff] [blame] | 35 | u32 exception_stack[0x400] __attribute__((aligned(8))); |
Gabe Black | a799151 | 2013-12-07 04:25:01 -0800 | [diff] [blame] | 36 | |
Julius Werner | 092cac5 | 2014-05-15 19:41:52 -0700 | [diff] [blame] | 37 | static exception_hook hook; |
| 38 | static const char *names[EXC_COUNT] = { |
| 39 | [EXC_DE] = "Divide by Zero", |
| 40 | [EXC_DB] = "Debug", |
| 41 | [EXC_NMI] = "Non-Maskable-Interrupt", |
| 42 | [EXC_BP] = "Breakpoint", |
| 43 | [EXC_OF] = "Overflow", |
| 44 | [EXC_BR] = "Bound Range", |
| 45 | [EXC_UD] = "Invalid Opcode", |
| 46 | [EXC_NM] = "Device Not Available", |
| 47 | [EXC_DF] = "Double Fault", |
| 48 | [EXC_TS] = "Invalid TSS", |
| 49 | [EXC_NP] = "Segment Not Present", |
| 50 | [EXC_SS] = "Stack Fault", |
| 51 | [EXC_GP] = "General Protection Fault", |
| 52 | [EXC_PF] = "Page Fault", |
| 53 | [EXC_MF] = "x87 Floating Point", |
| 54 | [EXC_AC] = "Alignment Check", |
| 55 | [EXC_MC] = "Machine Check", |
| 56 | [EXC_XF] = "SIMD Floating Point", |
| 57 | [EXC_SX] = "Security", |
Gabe Black | a799151 | 2013-12-07 04:25:01 -0800 | [diff] [blame] | 58 | }; |
| 59 | |
| 60 | static void print_segment_error_code(u32 code) |
| 61 | { |
| 62 | printf("%#x - descriptor %#x in the ", code, (code >> 3) & 0x1f); |
| 63 | if (code & (0x1 << 1)) { |
| 64 | printf("IDT"); |
| 65 | } else { |
| 66 | if (code & 0x04) |
| 67 | printf("LDT"); |
| 68 | else |
| 69 | printf("GDT"); |
| 70 | } |
| 71 | if (code & (0x1 << 0)) |
| 72 | printf(", external to the CPU"); |
| 73 | else |
| 74 | printf(", internal to the CPU"); |
| 75 | } |
| 76 | |
| 77 | static void print_page_fault_error_code(u32 code) |
| 78 | { |
| 79 | printf("%#x -", code); |
| 80 | if (code & (0x1 << 0)) |
| 81 | printf(" page protection"); |
| 82 | else |
| 83 | printf(" page not present"); |
| 84 | if (code & (0x1 << 1)) |
| 85 | printf(", write"); |
| 86 | else |
| 87 | printf(", read"); |
| 88 | if (code & (0x1 << 2)) |
| 89 | printf(", user"); |
| 90 | else |
| 91 | printf(", supervisor"); |
| 92 | if (code & (0x1 << 3)) |
| 93 | printf(", reserved bits set"); |
| 94 | if (code & (0x1 << 4)) |
| 95 | printf(", instruction fetch"); |
| 96 | } |
| 97 | |
| 98 | static void print_raw_error_code(u32 code) |
| 99 | { |
| 100 | printf("%#x", code); |
| 101 | } |
| 102 | |
Gabe Black | a799151 | 2013-12-07 04:25:01 -0800 | [diff] [blame] | 103 | static void dump_stack(uintptr_t addr, size_t bytes) |
| 104 | { |
| 105 | int i, j; |
| 106 | const int line = 8; |
| 107 | uint32_t *ptr = (uint32_t *)(addr & ~(line * sizeof(*ptr) - 1)); |
| 108 | |
| 109 | printf("Dumping stack:\n"); |
| 110 | for (i = bytes / sizeof(*ptr); i >= 0; i -= line) { |
| 111 | printf("%p: ", ptr + i); |
| 112 | for (j = i; j < i + line; j++) |
| 113 | printf("%08x ", *(ptr + j)); |
| 114 | printf("\n"); |
| 115 | } |
| 116 | } |
| 117 | |
Julius Werner | 092cac5 | 2014-05-15 19:41:52 -0700 | [diff] [blame] | 118 | static void dump_exception_state(void) |
Gabe Black | a799151 | 2013-12-07 04:25:01 -0800 | [diff] [blame] | 119 | { |
Julius Werner | 092cac5 | 2014-05-15 19:41:52 -0700 | [diff] [blame] | 120 | printf("%s Exception\n", names[exception_state->vector]); |
Patrick Georgi | bcf07c3 | 2014-12-29 19:34:56 +0100 | [diff] [blame] | 121 | |
Julius Werner | 092cac5 | 2014-05-15 19:41:52 -0700 | [diff] [blame] | 122 | printf("Error code: "); |
| 123 | switch (exception_state->vector) { |
| 124 | case EXC_PF: |
| 125 | print_page_fault_error_code(exception_state->error_code); |
| 126 | break; |
| 127 | case EXC_TS: |
| 128 | case EXC_NP: |
| 129 | case EXC_SS: |
| 130 | case EXC_GP: |
| 131 | print_segment_error_code(exception_state->error_code); |
| 132 | break; |
| 133 | case EXC_DF: |
| 134 | case EXC_AC: |
| 135 | case EXC_SX: |
| 136 | print_raw_error_code(exception_state->error_code); |
| 137 | break; |
| 138 | default: |
| 139 | printf("n/a"); |
| 140 | break; |
Gabe Black | a799151 | 2013-12-07 04:25:01 -0800 | [diff] [blame] | 141 | } |
Julius Werner | 092cac5 | 2014-05-15 19:41:52 -0700 | [diff] [blame] | 142 | printf("\n"); |
| 143 | printf("EIP: 0x%08x\n", exception_state->regs.eip); |
| 144 | printf("CS: 0x%04x\n", exception_state->regs.cs); |
| 145 | printf("EFLAGS: 0x%08x\n", exception_state->regs.eflags); |
| 146 | printf("EAX: 0x%08x\n", exception_state->regs.eax); |
| 147 | printf("ECX: 0x%08x\n", exception_state->regs.ecx); |
| 148 | printf("EDX: 0x%08x\n", exception_state->regs.edx); |
| 149 | printf("EBX: 0x%08x\n", exception_state->regs.ebx); |
| 150 | printf("ESP: 0x%08x\n", exception_state->regs.esp); |
| 151 | printf("EBP: 0x%08x\n", exception_state->regs.ebp); |
| 152 | printf("ESI: 0x%08x\n", exception_state->regs.esi); |
| 153 | printf("EDI: 0x%08x\n", exception_state->regs.edi); |
| 154 | printf("DS: 0x%04x\n", exception_state->regs.ds); |
| 155 | printf("ES: 0x%04x\n", exception_state->regs.es); |
| 156 | printf("SS: 0x%04x\n", exception_state->regs.ss); |
| 157 | printf("FS: 0x%04x\n", exception_state->regs.fs); |
| 158 | printf("GS: 0x%04x\n", exception_state->regs.gs); |
Gabe Black | a799151 | 2013-12-07 04:25:01 -0800 | [diff] [blame] | 159 | } |
| 160 | |
Gabe Black | 20cdb24 | 2013-12-11 00:23:15 -0800 | [diff] [blame] | 161 | void exception_dispatch(void) |
| 162 | { |
Julius Werner | 092cac5 | 2014-05-15 19:41:52 -0700 | [diff] [blame] | 163 | u32 vec = exception_state->vector; |
| 164 | die_if(vec >= EXC_COUNT || !names[vec], "Bad exception vector %u", vec); |
Gabe Black | 20cdb24 | 2013-12-11 00:23:15 -0800 | [diff] [blame] | 165 | |
Julius Werner | 092cac5 | 2014-05-15 19:41:52 -0700 | [diff] [blame] | 166 | if (hook && hook(vec)) |
| 167 | return; |
Gabe Black | 20cdb24 | 2013-12-11 00:23:15 -0800 | [diff] [blame] | 168 | |
Julius Werner | 092cac5 | 2014-05-15 19:41:52 -0700 | [diff] [blame] | 169 | dump_exception_state(); |
| 170 | dump_stack(exception_state->regs.esp, 512); |
| 171 | halt(); |
Gabe Black | 20cdb24 | 2013-12-11 00:23:15 -0800 | [diff] [blame] | 172 | } |
| 173 | |
Gabe Black | a799151 | 2013-12-07 04:25:01 -0800 | [diff] [blame] | 174 | void exception_init(void) |
| 175 | { |
Julius Werner | 092cac5 | 2014-05-15 19:41:52 -0700 | [diff] [blame] | 176 | exception_stack_end = exception_stack + ARRAY_SIZE(exception_stack); |
Gabe Black | a799151 | 2013-12-07 04:25:01 -0800 | [diff] [blame] | 177 | exception_init_asm(); |
| 178 | } |
Gabe Black | 20cdb24 | 2013-12-11 00:23:15 -0800 | [diff] [blame] | 179 | |
Julius Werner | 092cac5 | 2014-05-15 19:41:52 -0700 | [diff] [blame] | 180 | void exception_install_hook(exception_hook h) |
Gabe Black | 20cdb24 | 2013-12-11 00:23:15 -0800 | [diff] [blame] | 181 | { |
Julius Werner | 092cac5 | 2014-05-15 19:41:52 -0700 | [diff] [blame] | 182 | die_if(hook, "Implement support for a list of hooks if you need it."); |
| 183 | hook = h; |
Gabe Black | 20cdb24 | 2013-12-11 00:23:15 -0800 | [diff] [blame] | 184 | } |