1 #ifndef __IDT_TEST__ 2 #define __IDT_TEST__ 3 4 #include <setjmp.h> 5 6 void setup_idt(void); 7 void setup_alt_stack(void); 8 9 struct ex_regs { 10 unsigned long rax, rcx, rdx, rbx; 11 unsigned long dummy, rbp, rsi, rdi; 12 #ifdef __x86_64__ 13 unsigned long r8, r9, r10, r11; 14 unsigned long r12, r13, r14, r15; 15 #endif 16 unsigned long vector; 17 unsigned long error_code; 18 unsigned long rip; 19 unsigned long cs; 20 unsigned long rflags; 21 }; 22 23 typedef void (*handler)(struct ex_regs *regs); 24 25 typedef struct { 26 u16 prev; 27 u16 res1; 28 u32 esp0; 29 u16 ss0; 30 u16 res2; 31 u32 esp1; 32 u16 ss1; 33 u16 res3; 34 u32 esp2; 35 u16 ss2; 36 u16 res4; 37 u32 cr3; 38 u32 eip; 39 u32 eflags; 40 u32 eax, ecx, edx, ebx, esp, ebp, esi, edi; 41 u16 es; 42 u16 res5; 43 u16 cs; 44 u16 res6; 45 u16 ss; 46 u16 res7; 47 u16 ds; 48 u16 res8; 49 u16 fs; 50 u16 res9; 51 u16 gs; 52 u16 res10; 53 u16 ldt; 54 u16 res11; 55 u16 t:1; 56 u16 res12:15; 57 u16 iomap_base; 58 } tss32_t; 59 60 typedef struct __attribute__((packed)) { 61 u32 res1; 62 u64 rsp0; 63 u64 rsp1; 64 u64 rsp2; 65 u64 res2; 66 u64 ist1; 67 u64 ist2; 68 u64 ist3; 69 u64 ist4; 70 u64 ist5; 71 u64 ist6; 72 u64 ist7; 73 u64 res3; 74 u16 res4; 75 u16 iomap_base; 76 } tss64_t; 77 78 #define ASM_TRY(catch) \ 79 "movl $0, %%gs:4 \n\t" \ 80 ".pushsection .data.ex \n\t" \ 81 ".quad 1111f, " catch "\n\t" \ 82 ".popsection \n\t" \ 83 "1111:" 84 85 #define DB_VECTOR 1 86 #define BP_VECTOR 3 87 #define UD_VECTOR 6 88 #define GP_VECTOR 13 89 90 /* 91 * selector 32-bit 64-bit 92 * 0x00 NULL descriptor NULL descriptor 93 * 0x08 ring-0 code segment (32-bit) ring-0 code segment (64-bit) 94 * 0x10 ring-0 data segment (32-bit) ring-0 data segment (32/64-bit) 95 * 0x18 ring-0 code segment (P=0) ring-0 code segment (64-bit, P=0) 96 * 0x20 intr_alt_stack TSS ring-0 code segment (32-bit) 97 * 0x28 ring-0 code segment (16-bit) same 98 * 0x30 ring-0 data segment (16-bit) same 99 * 0x38 (0x3b) ring-3 code segment (32-bit) same 100 * 0x40 (0x43) ring-3 data segment (32-bit) ring-3 data segment (32/64-bit) 101 * 0x48 (0x4b) **unused** ring-3 code segment (64-bit) 102 * 0x50--0x78 free to use for test cases same 103 * 0x80 primary TSS (CPU 0) same 104 * 105 * Note that the same segment can be used for 32-bit and 64-bit data segments 106 * (the L bit is only defined for code segments) 107 * 108 * Selectors 0x08-0x10 and 0x3b-0x4b are set up for use with the SYSCALL 109 * and SYSRET instructions. 110 */ 111 112 #define KERNEL_CS 0x08 113 #define KERNEL_DS 0x10 114 #define NP_SEL 0x18 115 #ifdef __x86_64__ 116 #define KERNEL_CS32 0x20 117 #else 118 #define TSS_INTR 0x20 119 #endif 120 #define KERNEL_CS16 0x28 121 #define KERNEL_DS16 0x30 122 #define USER_CS32 0x3b 123 #define USER_DS 0x43 124 #ifdef __x86_64__ 125 #define USER_CS64 0x4b 126 #endif 127 128 /* Synonyms */ 129 #define KERNEL_DS32 KERNEL_DS 130 #define USER_DS32 USER_DS 131 132 #ifdef __x86_64__ 133 #define KERNEL_CS64 KERNEL_CS 134 #define USER_CS USER_CS64 135 #define KERNEL_DS64 KERNEL_DS 136 #define USER_DS64 USER_DS 137 #else 138 #define KERNEL_CS32 KERNEL_CS 139 #define USER_CS USER_CS32 140 #endif 141 142 #define FIRST_SPARE_SEL 0x50 143 #define TSS_MAIN 0x80 144 145 typedef struct { 146 unsigned short offset0; 147 unsigned short selector; 148 unsigned short ist : 3; 149 unsigned short : 5; 150 unsigned short type : 4; 151 unsigned short : 1; 152 unsigned short dpl : 2; 153 unsigned short p : 1; 154 unsigned short offset1; 155 #ifdef __x86_64__ 156 unsigned offset2; 157 unsigned reserved; 158 #endif 159 } idt_entry_t; 160 161 typedef struct { 162 u16 limit_low; 163 u16 base_low; 164 u8 base_middle; 165 u8 access; 166 u8 granularity; 167 u8 base_high; 168 } gdt_entry_t; 169 170 struct segment_desc64 { 171 uint16_t limit1; 172 uint16_t base1; 173 uint8_t base2; 174 union { 175 uint16_t type_limit_flags; /* Type and limit flags */ 176 struct { 177 uint16_t type:4; 178 uint16_t s:1; 179 uint16_t dpl:2; 180 uint16_t p:1; 181 uint16_t limit:4; 182 uint16_t avl:1; 183 uint16_t l:1; 184 uint16_t db:1; 185 uint16_t g:1; 186 } __attribute__((__packed__)); 187 } __attribute__((__packed__)); 188 uint8_t base3; 189 uint32_t base4; 190 uint32_t zero; 191 } __attribute__((__packed__)); 192 193 #define DESC_BUSY ((uint64_t) 1 << 41) 194 195 extern idt_entry_t boot_idt[256]; 196 197 #ifndef __x86_64__ 198 extern gdt_entry_t gdt32[]; 199 extern tss32_t tss; 200 extern tss32_t tss_intr; 201 void set_gdt_task_gate(u16 tss_sel, u16 sel); 202 void set_idt_task_gate(int vec, u16 sel); 203 void set_intr_task_gate(int vec, void *fn); 204 void setup_tss32(void); 205 #else 206 extern tss64_t tss; 207 #endif 208 209 unsigned exception_vector(void); 210 unsigned exception_error_code(void); 211 bool exception_rflags_rf(void); 212 void set_idt_entry(int vec, void *addr, int dpl); 213 void set_idt_sel(int vec, u16 sel); 214 void set_idt_dpl(int vec, u16 dpl); 215 void set_gdt_entry(int sel, u32 base, u32 limit, u8 access, u8 gran); 216 void set_intr_alt_stack(int e, void *fn); 217 void print_current_tss_info(void); 218 handler handle_exception(u8 v, handler fn); 219 void unhandled_exception(struct ex_regs *regs, bool cpu); 220 221 bool test_for_exception(unsigned int ex, void (*trigger_func)(void *data), 222 void *data); 223 void __set_exception_jmpbuf(jmp_buf *addr); 224 #define set_exception_jmpbuf(jmpbuf) \ 225 (setjmp(jmpbuf) ? : (__set_exception_jmpbuf(&(jmpbuf)), 0)) 226 227 #endif 228