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1 | # TITLE CpuAsm.S: \r |
| 2 | \r |
| 3 | #------------------------------------------------------------------------------\r |
| 4 | #*\r |
| 5 | #* Copyright 2008 - 2009, Intel Corporation\r |
| 6 | #* All rights reserved. This program and the accompanying materials\r |
| 7 | #* are licensed and made available under the terms and conditions of the BSD License\r |
| 8 | #* which accompanies this distribution. The full text of the license may be found at\r |
| 9 | #* http://opensource.org/licenses/bsd-license.php\r |
| 10 | #*\r |
| 11 | #* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r |
| 12 | #* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r |
| 13 | #*\r |
| 14 | #* CpuAsm.S\r |
| 15 | #*\r |
| 16 | #* Abstract:\r |
| 17 | #*\r |
| 18 | #------------------------------------------------------------------------------\r |
| 19 | \r |
| 20 | \r |
| 21 | #text SEGMENT\r |
| 22 | \r |
| 23 | \r |
| 24 | #EXTRN ASM_PFX(mErrorCodeFlag):DWORD # Error code flags for exceptions\r |
| 25 | \r |
| 26 | \r |
| 27 | #\r |
| 28 | # point to the external interrupt vector table\r |
| 29 | #\r |
| 30 | ExternalVectorTablePtr:\r |
| 31 | .byte 0, 0, 0, 0, 0, 0, 0, 0\r |
| 32 | \r |
| 33 | ASM_GLOBAL ASM_PFX(InitializeExternalVectorTablePtr)\r |
| 34 | ASM_PFX(InitializeExternalVectorTablePtr):\r |
| 35 | lea ExternalVectorTablePtr(%rip), %rax # save vector number\r |
| 36 | mov %rcx, (%rax) \r |
| 37 | ret\r |
| 38 | \r |
| 39 | \r |
| 40 | #------------------------------------------------------------------------------\r |
| 41 | # VOID\r |
| 42 | # SetCodeSelector (\r |
| 43 | # UINT16 Selector\r |
| 44 | # );\r |
| 45 | #------------------------------------------------------------------------------\r |
| 46 | ASM_GLOBAL ASM_PFX(SetCodeSelector)\r |
| 47 | ASM_PFX(SetCodeSelector):\r |
| 48 | subq $0x10, %rsp \r |
| 49 | leaq setCodeSelectorLongJump(%rip), %rax \r |
| 50 | movq %rax, (%rsp) \r |
| 51 | movw %cx, 4(%rsp)\r |
| 52 | .byte 0xFF, 0x2C, 0x24 # jmp (%rsp) note:fword jmp\r |
| 53 | setCodeSelectorLongJump:\r |
| 54 | addq $0x10, %rsp\r |
| 55 | ret\r |
| 56 | \r |
| 57 | #------------------------------------------------------------------------------\r |
| 58 | # VOID\r |
| 59 | # SetDataSelectors (\r |
| 60 | # UINT16 Selector\r |
| 61 | # );\r |
| 62 | #------------------------------------------------------------------------------\r |
| 63 | ASM_GLOBAL ASM_PFX(SetDataSelectors)\r |
| 64 | ASM_PFX(SetDataSelectors):\r |
| 65 | movw %cx, %ss\r |
| 66 | movw %cx, %ds\r |
| 67 | movw %cx, %es\r |
| 68 | movw %cx, %fs\r |
| 69 | movw %cx, %gs\r |
| 70 | ret\r |
| 71 | \r |
| 72 | #---------------------------------------;\r |
| 73 | # CommonInterruptEntry ;\r |
| 74 | #---------------------------------------;\r |
| 75 | # The follow algorithm is used for the common interrupt routine.\r |
| 76 | \r |
| 77 | ASM_GLOBAL ASM_PFX(CommonInterruptEntry)\r |
| 78 | ASM_PFX(CommonInterruptEntry):\r |
| 79 | cli\r |
| 80 | #\r |
| 81 | # All interrupt handlers are invoked through interrupt gates, so\r |
| 82 | # IF flag automatically cleared at the entry point\r |
| 83 | #\r |
| 84 | #\r |
| 85 | # Calculate vector number\r |
| 86 | #\r |
| 87 | xchgq (%rsp), %rcx # get the return address of call, actually, it is the address of vector number.\r |
| 88 | movzwl (%rcx), %ecx \r |
| 89 | cmp $32, %ecx # Intel reserved vector for exceptions?\r |
| 90 | jae NoErrorCode\r |
| 91 | pushq %rax\r |
| 92 | leaq ASM_PFX(mErrorCodeFlag)(%rip), %rax\r |
| 93 | bt %ecx, (%rax) \r |
| 94 | popq %rax\r |
| 95 | jc CommonInterruptEntry_al_0000\r |
| 96 | \r |
| 97 | NoErrorCode:\r |
| 98 | \r |
| 99 | #\r |
| 100 | # Push a dummy error code on the stack\r |
| 101 | # to maintain coherent stack map\r |
| 102 | #\r |
| 103 | pushq (%rsp)\r |
| 104 | movq $0, 8(%rsp)\r |
| 105 | CommonInterruptEntry_al_0000:\r |
| 106 | pushq %rbp\r |
| 107 | movq %rsp, %rbp\r |
| 108 | \r |
| 109 | #\r |
| 110 | # Stack:\r |
| 111 | # +---------------------+ <-- 16-byte aligned ensured by processor\r |
| 112 | # + Old SS +\r |
| 113 | # +---------------------+\r |
| 114 | # + Old RSP +\r |
| 115 | # +---------------------+\r |
| 116 | # + RFlags +\r |
| 117 | # +---------------------+\r |
| 118 | # + CS +\r |
| 119 | # +---------------------+\r |
| 120 | # + RIP +\r |
| 121 | # +---------------------+\r |
| 122 | # + Error Code +\r |
| 123 | # +---------------------+\r |
| 124 | # + RCX / Vector Number +\r |
| 125 | # +---------------------+\r |
| 126 | # + RBP +\r |
| 127 | # +---------------------+ <-- RBP, 16-byte aligned\r |
| 128 | #\r |
| 129 | \r |
| 130 | \r |
| 131 | #\r |
| 132 | # Since here the stack pointer is 16-byte aligned, so\r |
| 133 | # EFI_FX_SAVE_STATE_X64 of EFI_SYSTEM_CONTEXT_x64\r |
| 134 | # is 16-byte aligned\r |
| 135 | #\r |
| 136 | \r |
| 137 | #; UINT64 Rdi, Rsi, Rbp, Rsp, Rbx, Rdx, Rcx, Rax;\r |
| 138 | #; UINT64 R8, R9, R10, R11, R12, R13, R14, R15;\r |
| 139 | pushq %r15\r |
| 140 | pushq %r14\r |
| 141 | pushq %r13\r |
| 142 | pushq %r12\r |
| 143 | pushq %r11\r |
| 144 | pushq %r10\r |
| 145 | pushq %r9\r |
| 146 | pushq %r8\r |
| 147 | pushq %rax\r |
| 148 | pushq 8(%rbp) # RCX\r |
| 149 | pushq %rdx\r |
| 150 | pushq %rbx\r |
| 151 | pushq 48(%rbp) # RSP\r |
| 152 | pushq (%rbp) # RBP\r |
| 153 | pushq %rsi\r |
| 154 | pushq %rdi\r |
| 155 | \r |
| 156 | #; UINT64 Gs, Fs, Es, Ds, Cs, Ss; insure high 16 bits of each is zero\r |
| 157 | movzwq 56(%rbp), %rax\r |
| 158 | pushq %rax # for ss\r |
| 159 | movzwq 32(%rbp), %rax\r |
| 160 | pushq %rax # for cs\r |
| 161 | movq %ds, %rax\r |
| 162 | pushq %rax\r |
| 163 | movq %es, %rax\r |
| 164 | pushq %rax\r |
| 165 | movq %fs, %rax\r |
| 166 | pushq %rax\r |
| 167 | movq %gs, %rax\r |
| 168 | pushq %rax\r |
| 169 | \r |
| 170 | movq %rcx, 8(%rbp) # save vector number\r |
| 171 | \r |
| 172 | #; UINT64 Rip;\r |
| 173 | pushq 24(%rbp)\r |
| 174 | \r |
| 175 | #; UINT64 Gdtr[2], Idtr[2];\r |
| 176 | xorq %rax, %rax\r |
| 177 | pushq %rax\r |
| 178 | pushq %rax\r |
| 179 | sidt (%rsp)\r |
| 180 | xchgq 2(%rsp), %rax\r |
| 181 | xchgq (%rsp), %rax\r |
| 182 | xchgq 8(%rsp), %rax\r |
| 183 | \r |
| 184 | xorq %rax, %rax\r |
| 185 | pushq %rax\r |
| 186 | pushq %rax\r |
| 187 | sgdt (%rsp)\r |
| 188 | xchgq 2(%rsp), %rax\r |
| 189 | xchgq (%rsp), %rax\r |
| 190 | xchgq 8(%rsp), %rax\r |
| 191 | \r |
| 192 | #; UINT64 Ldtr, Tr;\r |
| 193 | xorq %rax, %rax\r |
| 194 | str %ax\r |
| 195 | pushq %rax\r |
| 196 | sldt %ax\r |
| 197 | pushq %rax\r |
| 198 | \r |
| 199 | #; UINT64 RFlags;\r |
| 200 | pushq 40(%rbp)\r |
| 201 | \r |
| 202 | #; UINT64 Cr0, Cr1, Cr2, Cr3, Cr4, Cr8;\r |
| 203 | movq %cr8, %rax\r |
| 204 | pushq %rax\r |
| 205 | movq %cr4, %rax\r |
| 206 | orq $0x208, %rax \r |
| 207 | movq %rax, %cr4 \r |
| 208 | pushq %rax\r |
| 209 | mov %cr3, %rax \r |
| 210 | pushq %rax\r |
| 211 | mov %cr2, %rax \r |
| 212 | pushq %rax\r |
| 213 | xorq %rax, %rax\r |
| 214 | pushq %rax\r |
| 215 | mov %cr0, %rax \r |
| 216 | pushq %rax\r |
| 217 | \r |
| 218 | #; UINT64 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7;\r |
| 219 | movq %dr7, %rax\r |
| 220 | pushq %rax\r |
| 221 | #; clear Dr7 while executing debugger itself\r |
| 222 | xorq %rax, %rax\r |
| 223 | movq %rax, %dr7\r |
| 224 | \r |
| 225 | movq %dr6, %rax\r |
| 226 | pushq %rax\r |
| 227 | #; insure all status bits in dr6 are clear...\r |
| 228 | xorq %rax, %rax\r |
| 229 | movq %rax, %dr6\r |
| 230 | \r |
| 231 | movq %dr3, %rax\r |
| 232 | pushq %rax\r |
| 233 | movq %dr2, %rax\r |
| 234 | pushq %rax\r |
| 235 | movq %dr1, %rax\r |
| 236 | pushq %rax\r |
| 237 | movq %dr0, %rax\r |
| 238 | pushq %rax\r |
| 239 | \r |
| 240 | #; FX_SAVE_STATE_X64 FxSaveState;\r |
| 241 | subq $512, %rsp\r |
| 242 | movq %rsp, %rdi\r |
| 243 | .byte 0x0f, 0x0ae, 0x07 #fxsave [rdi]\r |
| 244 | \r |
| 245 | #; UINT32 ExceptionData;\r |
| 246 | pushq 16(%rbp)\r |
| 247 | \r |
| 248 | #; call into exception handler\r |
| 249 | movq 8(%rbp), %rcx\r |
| 250 | leaq ExternalVectorTablePtr(%rip), %rax\r |
| 251 | movl (%eax), %eax\r |
| 252 | movq (%rax,%rcx,8), %rax\r |
| 253 | orq %rax, %rax # NULL?\r |
| 254 | \r |
| 255 | je nonNullValue#\r |
| 256 | \r |
| 257 | #; Prepare parameter and call\r |
| 258 | # mov rcx, [rbp + 8]\r |
| 259 | mov %rsp, %rdx\r |
| 260 | #\r |
| 261 | # Per X64 calling convention, allocate maximum parameter stack space\r |
| 262 | # and make sure RSP is 16-byte aligned\r |
| 263 | #\r |
| 264 | subq $40, %rsp \r |
| 265 | call *%rax\r |
| 266 | addq $40, %rsp\r |
| 267 | \r |
| 268 | nonNullValue:\r |
| 269 | cli\r |
| 270 | #; UINT64 ExceptionData;\r |
| 271 | addq $8, %rsp\r |
| 272 | \r |
| 273 | #; FX_SAVE_STATE_X64 FxSaveState;\r |
| 274 | \r |
| 275 | movq %rsp, %rsi\r |
| 276 | .byte 0x0f, 0x0ae, 0x0E # fxrstor [rsi]\r |
| 277 | addq $512, %rsp\r |
| 278 | \r |
| 279 | #; UINT64 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7;\r |
| 280 | popq %rax\r |
| 281 | movq %rax, %dr0\r |
| 282 | popq %rax\r |
| 283 | movq %rax, %dr1\r |
| 284 | popq %rax\r |
| 285 | movq %rax, %dr2\r |
| 286 | popq %rax\r |
| 287 | movq %rax, %dr3\r |
| 288 | #; skip restore of dr6. We cleared dr6 during the context save.\r |
| 289 | addq $8, %rsp\r |
| 290 | popq %rax\r |
| 291 | movq %rax, %dr7\r |
| 292 | \r |
| 293 | #; UINT64 Cr0, Cr1, Cr2, Cr3, Cr4, Cr8;\r |
| 294 | popq %rax\r |
| 295 | movq %rax, %cr0\r |
| 296 | addq $8, %rsp # not for Cr1\r |
| 297 | popq %rax\r |
| 298 | movq %rax, %cr2\r |
| 299 | popq %rax\r |
| 300 | movq %rax, %cr3\r |
| 301 | popq %rax\r |
| 302 | movq %rax, %cr4\r |
| 303 | popq %rax\r |
| 304 | movq %rax, %cr8\r |
| 305 | \r |
| 306 | #; UINT64 RFlags;\r |
| 307 | popq 40(%rbp)\r |
| 308 | \r |
| 309 | #; UINT64 Ldtr, Tr;\r |
| 310 | #; UINT64 Gdtr[2], Idtr[2];\r |
| 311 | #; Best not let anyone mess with these particular registers...\r |
| 312 | addq $48, %rsp\r |
| 313 | \r |
| 314 | #; UINT64 Rip;\r |
| 315 | popq 24(%rbp)\r |
| 316 | \r |
| 317 | #; UINT64 Gs, Fs, Es, Ds, Cs, Ss;\r |
| 318 | popq %rax\r |
| 319 | # mov %rax, %gs ; not for gs\r |
| 320 | popq %rax\r |
| 321 | # mov %rax, %fs ; not for fs\r |
| 322 | # (X64 will not use fs and gs, so we do not restore it)\r |
| 323 | popq %rax\r |
| 324 | movq %rax, %es\r |
| 325 | popq %rax\r |
| 326 | movq %rax, %ds\r |
| 327 | popq 32(%rbp) # for cs\r |
| 328 | popq 56(%rbp) # for ss\r |
| 329 | \r |
| 330 | #; UINT64 Rdi, Rsi, Rbp, Rsp, Rbx, Rdx, Rcx, Rax;\r |
| 331 | #; UINT64 R8, R9, R10, R11, R12, R13, R14, R15;\r |
| 332 | popq %rdi\r |
| 333 | popq %rsi\r |
| 334 | addq $8, %rsp # not for rbp\r |
| 335 | popq 48(%rbp) # for rsp\r |
| 336 | popq %rbx\r |
| 337 | popq %rdx\r |
| 338 | popq %rcx\r |
| 339 | popq %rax\r |
| 340 | popq %r8\r |
| 341 | popq %r9\r |
| 342 | popq %r10\r |
| 343 | popq %r11\r |
| 344 | popq %r12\r |
| 345 | popq %r13\r |
| 346 | popq %r14\r |
| 347 | popq %r15\r |
| 348 | \r |
| 349 | movq %rbp, %rsp\r |
| 350 | popq %rbp\r |
| 351 | addq $16, %rsp\r |
| 352 | iretq\r |
| 353 | \r |
| 354 | \r |
| 355 | #text ENDS\r |
| 356 | \r |
| 357 | #END\r |
| 358 | \r |
| 359 | \r |
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