1 | /* |
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2 | * hal_exception.c - Implementation of exception handler for x86_64 |
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3 | * |
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4 | * Copyright (c) 2017 Maxime Villard |
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5 | * |
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6 | * This file is part of ALMOS-MKH. |
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7 | * |
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8 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
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9 | * under the terms of the GNU General Public License as published by |
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10 | * the Free Software Foundation; version 2.0 of the License. |
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11 | * |
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12 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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13 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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15 | * General Public License for more details. |
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16 | * |
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17 | * You should have received a copy of the GNU General Public License |
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18 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
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19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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20 | */ |
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21 | |
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22 | #include <hal_types.h> |
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23 | #include <hal_irqmask.h> |
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24 | #include <hal_exception.h> |
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25 | #include <thread.h> |
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26 | #include <errno.h> |
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27 | #include <core.h> |
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28 | |
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29 | #include <hal_kentry.h> |
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30 | #include <hal_internal.h> |
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31 | #include <hal_segmentation.h> |
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32 | |
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33 | static const char *exc_type[] = { |
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34 | [T_PRIVINFLT]= "privileged instruction fault", |
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35 | [T_BPTFLT] = "breakpoint trap", |
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36 | [T_ARITHTRAP] = "arithmetic trap", |
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37 | [T_ASTFLT] = "asynchronous system trap", |
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38 | [T_PROTFLT] = "protection fault", |
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39 | [T_TRCTRAP] = "trace trap", |
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40 | [T_PAGEFLT] = "page fault", |
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41 | [T_ALIGNFLT] = "alignment fault", |
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42 | [T_DIVIDE] = "integer divide fault", |
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43 | [T_NMI] = "non-maskable interrupt", |
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44 | [T_OFLOW] = "overflow trap", |
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45 | [T_BOUND] = "bounds check fault", |
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46 | [T_DNA] = "FPU not available fault", |
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47 | [T_DOUBLEFLT] = "double fault", |
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48 | [T_FPOPFLT] = "FPU operand fetch fault", |
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49 | [T_TSSFLT] = "invalid TSS fault", |
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50 | [T_SEGNPFLT] = "segment not present fault", |
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51 | [T_STKFLT] = "stack fault", |
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52 | [T_MCA] = "machine check fault", |
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53 | [T_XMM] = "SSE FP exception", |
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54 | }; |
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55 | int exc_types = __arraycount(exc_type); |
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56 | |
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57 | static void hal_exception_kern(hal_trapframe_t *tf) |
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58 | { |
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59 | uint64_t trapno = tf->tf_trapno; |
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60 | const char *buf; |
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61 | |
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62 | if (trapno < exc_types) { |
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63 | buf = exc_type[trapno]; |
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64 | } else { |
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65 | buf = "unknown exception"; |
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66 | } |
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67 | |
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68 | x86_lock(); |
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69 | x86_printf("\n****** EXCEPTION OCCURRED IN KERNEL MODE ******\n"); |
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70 | x86_printf("%s\n", (char *)buf); |
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71 | x86_printf("-> rip = %Z\n", tf->tf_rip); |
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72 | x86_printf("-> rdi = %Z\n", tf->tf_rdi); |
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73 | x86_printf("-> rbp = %Z\n", tf->tf_rbp); |
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74 | x86_printf("-> tls = %Z (gid=%Z)\n", (uint64_t)curtls(), |
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75 | (uint64_t)hal_get_gid()); |
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76 | x86_printf("-> err = %Z\n", tf->tf_err); |
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77 | if (trapno == T_PAGEFLT) |
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78 | x86_printf("-> va = %Z\n", rcr2()); |
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79 | x86_printf("\n***********************************************\n"); |
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80 | x86_unlock(); |
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81 | |
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82 | while (1); |
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83 | } |
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84 | |
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85 | static void hal_exception_user(hal_trapframe_t *tf) |
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86 | { |
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87 | thread_t *thread = curtls()->tls_thr; |
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88 | process_t *process = thread->process; |
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89 | intptr_t bad_vaddr; |
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90 | error_t error; |
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91 | |
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92 | switch (tf->tf_trapno) { |
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93 | case T_PAGEFLT: |
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94 | bad_vaddr = rcr2(); |
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95 | |
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96 | error = vmm_handle_page_fault(process, |
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97 | bad_vaddr >> CONFIG_PPM_PAGE_SHIFT); |
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98 | |
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99 | x86_printf("VA=%Z ERROR=%Z\n", bad_vaddr, (uint64_t)error); |
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100 | break; |
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101 | |
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102 | default: |
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103 | x86_panic("userland not yet handled"); |
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104 | } |
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105 | } |
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106 | |
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107 | /* |
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108 | * Exception handler. |
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109 | */ |
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110 | void hal_exception_entry(hal_trapframe_t *tf) |
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111 | { |
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112 | if ((tf->tf_cs & SEL_RPL) == SEL_UPL) |
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113 | hal_exception_user(tf); |
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114 | else |
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115 | hal_exception_kern(tf); |
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116 | } |
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117 | |
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118 | /* -------------------------------------------------------------------------- */ |
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119 | |
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120 | void hal_do_exception( thread_t * this, |
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121 | reg_t * regs_tbl ) |
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122 | { |
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123 | x86_panic((char *)__func__); |
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124 | } |
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125 | |
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126 | void hal_exception_dump( thread_t * this, |
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127 | reg_t * regs_tbl ) |
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128 | { |
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129 | x86_panic((char *)__func__); |
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130 | } |
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131 | |
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