projects / mirror_edk2.git / blame
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| 7b414b4e | 1 | /// @file\r |
| 2 | /// Low level IPF routines used by the debug support driver\r | |
| 3 | ///\r | |
| e5eed7d3 HT |
4 | /// Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>\r |
| 5 | /// This program and the accompanying materials\r | |
| 7b414b4e | 6 | /// are licensed and made available under the terms and conditions of the BSD License\r |
| 7 | /// which accompanies this distribution. The full text of the license may be found at\r | |
| 8 | /// http://opensource.org/licenses/bsd-license.php\r | |
| 9 | ///\r | |
| 10 | /// THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
| 11 | /// WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
| 12 | ///\r | |
| 7b414b4e | 13 | ///\r |
| c1f23d63 | 14 | \r |
| 15 | \r | |
| e9f9d09a | 16 | #include "Common.i"\r |
| c1f23d63 | 17 | #include "Ds64Macros.i"\r |
| 18 | \r | |
| 132f41f0 | 19 | ASM_GLOBAL PatchSaveBuffer\r |
| 20 | ASM_GLOBAL IpfContextBuf\r | |
| 21 | ASM_GLOBAL CommonHandler\r | |
| 22 | ASM_GLOBAL ExternalInterruptCount\r | |
| c1f23d63 | 23 | \r |
| 24 | \r | |
| 25 | /////////////////////////////////////////////\r | |
| 26 | //\r | |
| 27 | // Name:\r | |
| 28 | // InstructionCacheFlush\r | |
| 29 | //\r | |
| 30 | // Description:\r | |
| 31 | // Flushes instruction cache for specified number of bytes\r | |
| 32 | //\r | |
| 132f41f0 | 33 | ASM_GLOBAL InstructionCacheFlush\r |
| c1f23d63 | 34 | .proc InstructionCacheFlush\r |
| 35 | .align 32\r | |
| 36 | InstructionCacheFlush::\r | |
| 37 | { .mii\r | |
| 38 | alloc r3=2, 0, 0, 0\r | |
| 39 | cmp4.leu p0,p6=32, r33;;\r | |
| 40 | (p6) mov r33=32;;\r | |
| 41 | }\r | |
| 42 | { .mii\r | |
| 43 | nop.m 0\r | |
| 44 | zxt4 r29=r33;;\r | |
| 45 | dep.z r30=r29, 0, 5;;\r | |
| 46 | }\r | |
| 47 | { .mii\r | |
| 48 | cmp4.eq p0,p7=r0, r30\r | |
| 49 | shr.u r28=r29, 5;;\r | |
| 50 | (p7) adds r28=1, r28;;\r | |
| 51 | }\r | |
| 52 | { .mii\r | |
| 53 | nop.m 0\r | |
| 54 | shl r27=r28, 5;;\r | |
| 55 | zxt4 r26=r27;;\r | |
| 56 | }\r | |
| 57 | { .mfb\r | |
| 58 | add r31=r26, r32\r | |
| 59 | nop.f 0\r | |
| 60 | nop.b 0\r | |
| 61 | }\r | |
| 62 | LoopBack: // $L143:\r | |
| 63 | { .mii\r | |
| 64 | fc r32\r | |
| 65 | adds r32=32, r32;;\r | |
| 66 | cmp.ltu p14,p15=r32, r31\r | |
| 67 | }\r | |
| 68 | { .mfb\r | |
| 69 | nop.m 0\r | |
| 70 | nop.f 0\r | |
| 71 | //(p14) br.cond.dptk.few $L143#;;\r | |
| 72 | (p14) br.cond.dptk.few LoopBack;;\r | |
| 73 | }\r | |
| 74 | { .mmi\r | |
| 75 | sync.i;;\r | |
| 76 | srlz.i\r | |
| 77 | nop.i 0;;\r | |
| 78 | }\r | |
| 79 | { .mfb\r | |
| 80 | nop.m 0\r | |
| 81 | nop.f 0\r | |
| 82 | br.ret.sptk.few b0;;\r | |
| 83 | }\r | |
| 84 | .endp InstructionCacheFlush\r | |
| 85 | \r | |
| 86 | \r | |
| 87 | /////////////////////////////////////////////\r | |
| 88 | //\r | |
| 89 | // Name:\r | |
| 90 | // ChainHandler\r | |
| 91 | //\r | |
| 92 | // Description:\r | |
| 93 | // Chains an interrupt handler\r | |
| 94 | //\r | |
| 95 | // The purpose of this function is to enable chaining of the external interrupt.\r | |
| 96 | // Since there's no clean SAL abstraction for doing this, we must do it\r | |
| 97 | // surreptitiously.\r | |
| 98 | //\r | |
| 99 | // The reserved IVT entry at offset 0x3400 is coopted for use by this handler.\r | |
| 100 | // According to Itanium architecture, it is reserved. Strictly speaking, this is\r | |
| 101 | // not safe, as we're cheating and violating the Itanium architecture. However,\r | |
| 102 | // as long as we're the only ones cheating, we should be OK. Without hooks in\r | |
| 103 | // the SAL to enable IVT management, there aren't many good options.\r | |
| 104 | //\r | |
| 105 | // The strategy is to replace the first bundle of the external interrupt handler\r | |
| 106 | // with our own that will branch into a piece of code we've supplied and located\r | |
| 107 | // in the reserved IVT entry. Only the first bundle of the external interrupt\r | |
| 108 | // IVT entry is modified.\r | |
| 109 | //\r | |
| 110 | // The original bundle is moved and relocated to space\r | |
| 111 | // allocated within the reserved IVT entry. The next bundle following is\r | |
| 112 | // is generated to go a hard coded branch back to the second bundle of the\r | |
| 113 | // external interrupt IVT entry just in case the first bundle had no branch.\r | |
| 114 | //\r | |
| 115 | // Our new code will execute our handler, and then fall through to the\r | |
| 116 | // original bundle after restoring all context appropriately.\r | |
| 117 | //\r | |
| 118 | // The following is a representation of what the IVT memory map looks like with\r | |
| 119 | // our chained handler installed:\r | |
| 120 | //\r | |
| 121 | //\r | |
| 7b414b4e | 122 | //\r |
| 123 | //\r | |
| 124 | //\r | |
| 125 | // This IVT entry is Failsafe bundle\r | |
| 126 | // reserved by the\r | |
| 127 | // Itanium architecture Original bundle 0\r | |
| 128 | // and is used for\r | |
| 129 | // for locating our\r | |
| 130 | // handler and the\r | |
| 131 | // original bundle Patch code...\r | |
| 132 | // zero of the ext\r | |
| 133 | // interrupt handler\r | |
| 134 | //\r | |
| 135 | // RSVD (3400) Unused\r | |
| 136 | //\r | |
| 137 | //\r | |
| 138 | //\r | |
| 139 | //\r | |
| 140 | //\r | |
| 141 | //\r | |
| 142 | //\r | |
| 143 | //\r | |
| 144 | //\r | |
| 145 | //\r | |
| 146 | //\r | |
| 147 | //\r | |
| c1f23d63 | 148 | // EXT_INT (3000) Bundle 0 Bundle zero - This one is\r |
| 149 | // modified, all other bundles\r | |
| 150 | // in the EXT_INT entry are\r | |
| 151 | // untouched.\r | |
| 152 | //\r | |
| 153 | //\r | |
| 154 | // Arguments:\r | |
| 155 | //\r | |
| 156 | // Returns:\r | |
| 157 | //\r | |
| 158 | // Notes:\r | |
| 159 | //\r | |
| 160 | //\r | |
| 132f41f0 | 161 | ASM_GLOBAL ChainHandler\r |
| c1f23d63 | 162 | .proc ChainHandler\r |
| 163 | ChainHandler:\r | |
| 164 | \r | |
| 165 | NESTED_SETUP( 0,2+3,3,0 )\r | |
| 166 | \r | |
| 167 | mov r8=1 // r8 = success\r | |
| 168 | mov r2=cr.iva;;\r | |
| 169 | //\r | |
| 170 | // NOTE: There's a potential hazard here in that we're simply stealing a bunch of\r | |
| 171 | // bundles (memory) from the IVT and assuming there's no catastrophic side effect.\r | |
| 172 | //\r | |
| 173 | // First, save IVT area we're taking over with the patch so we can restore it later\r | |
| 174 | //\r | |
| 175 | addl out0=PATCH_ENTRY_OFFSET, r2 // out0 = source buffer\r | |
| 176 | movl out1=PatchSaveBuffer // out1 = destination buffer\r | |
| 177 | mov out2=0x40;; // out2 = number of bundles to copy... save entire IDT entry\r | |
| 178 | br.call.sptk.few b0 = CopyBundles\r | |
| 179 | \r | |
| 180 | // Next, copy the patch code into the IVT\r | |
| 181 | movl out0=PatchCode // out0 = source buffer of patch code\r | |
| 182 | addl out1=PATCH_OFFSET, r2 // out1 = destination buffer - in IVT\r | |
| f8c9de87 | 183 | mov out2=PATCH_CODE_SIZE;; \r |
| 184 | shr out2=out2, 4;; // out2 = number of bundles to copy\r | |
| c1f23d63 | 185 | br.call.sptk.few b0 = CopyBundles\r |
| 186 | \r | |
| 187 | \r | |
| 188 | // copy original bundle 0 from the external interrupt handler to the\r | |
| 189 | // appropriate place in the reserved IVT interrupt slot\r | |
| 190 | addl out0=EXT_INT_ENTRY_OFFSET, r2 // out0 = source buffer\r | |
| 191 | addl out1=RELOCATED_EXT_INT, r2 // out1 = destination buffer - in reserved IVT\r | |
| 192 | mov out2=1;; // out2 = copy 1 bundle\r | |
| 193 | br.call.sptk.few b0 = CopyBundles\r | |
| 194 | \r | |
| 195 | // Now relocate it there because it very likely had a branch instruction that\r | |
| 196 | // that must now be fixed up.\r | |
| 197 | addl out0=RELOCATED_EXT_INT, r2 // out0 = new runtime address of bundle - in reserved IVT\r | |
| 198 | addl out1=EXT_INT_ENTRY_OFFSET, r2;;// out1 = IP address of previous location\r | |
| 199 | mov out2=out0;; // out2 = IP address of new location\r | |
| 200 | br.call.sptk.few b0 = RelocateBundle\r | |
| 201 | \r | |
| 202 | // Now copy into the failsafe branch into the next bundle just in case\r | |
| 203 | // the original ext int bundle 0 bundle did not contain a branch instruction\r | |
| 204 | movl out0=FailsafeBranch // out0 = source buffer\r | |
| 205 | addl out1=FAILSAFE_BRANCH_OFFSET, r2 // out1 = destination buffer - in reserved IVT\r | |
| 206 | mov out2=1;; // out2 = copy 1 bundle\r | |
| 207 | br.call.sptk.few b0 = CopyBundles\r | |
| 208 | \r | |
| 209 | // Last, copy in our replacement for the external interrupt IVT entry bundle 0\r | |
| 210 | movl out0=PatchCodeNewBun0 // out0 = source buffer - our replacement bundle 0\r | |
| 211 | addl out1=EXT_INT_ENTRY_OFFSET, r2 // out1 = destination buffer - bundle 0 of External interrupt entry\r | |
| 212 | mov out2=1;; // out2 = copy 1 bundle\r | |
| 213 | br.call.sptk.few b0 = CopyBundles\r | |
| 214 | \r | |
| 215 | ChainHandlerDone:\r | |
| 216 | NESTED_RETURN\r | |
| 217 | \r | |
| 218 | .endp ChainHandler\r | |
| 219 | \r | |
| 220 | \r | |
| 221 | /////////////////////////////////////////////\r | |
| 222 | //\r | |
| 223 | // Name:\r | |
| 224 | // UnchainHandler\r | |
| 225 | //\r | |
| 226 | // Description:\r | |
| 227 | // Unchains an interrupt handler\r | |
| 228 | //\r | |
| 229 | // Arguments:\r | |
| 230 | //\r | |
| 231 | // Returns:\r | |
| 232 | //\r | |
| 233 | // Notes:\r | |
| 234 | //\r | |
| 235 | //\r | |
| 132f41f0 | 236 | ASM_GLOBAL UnchainHandler\r |
| c1f23d63 | 237 | .proc UnchainHandler\r |
| 238 | \r | |
| 239 | UnchainHandler:\r | |
| 240 | \r | |
| 241 | NESTED_SETUP( 0,2+3,3,0 )\r | |
| 242 | \r | |
| 243 | mov r8=1 // r8 = success\r | |
| 244 | mov r2=cr.iva;; // r2 = interrupt vector address\r | |
| 245 | \r | |
| 246 | // First copy original Ext Int bundle 0 back to it's proper home...\r | |
| 247 | addl out0=RELOCATED_EXT_INT, r2 // out0 = source - in reserved IVT\r | |
| 248 | addl out1=EXT_INT_ENTRY_OFFSET, r2 // out1 = destination buffer - first bundle of Ext Int entry\r | |
| 249 | mov out2=1;; // out2 = copy 1 bundle\r | |
| 250 | br.call.sptk.few b0 = CopyBundles\r | |
| 251 | \r | |
| 252 | // Now, relocate it again...\r | |
| 253 | addl out0=EXT_INT_ENTRY_OFFSET, r2 // out1 = New runtime address\r | |
| 254 | addl out1=RELOCATED_EXT_INT, r2;; // out0 = IP address of previous location\r | |
| 255 | mov out2=out0;; // out2 = IP address of new location\r | |
| 256 | br.call.sptk.few b0 = RelocateBundle\r | |
| 257 | \r | |
| 258 | // Last, restore the patch area\r | |
| 259 | movl out0=PatchSaveBuffer // out0 = source buffer\r | |
| 260 | addl out1=PATCH_ENTRY_OFFSET, r2 // out1 = destination buffer\r | |
| 261 | mov out2=0x40;; // out2 = number of bundles to copy... save entire IDT entry\r | |
| 262 | br.call.sptk.few b0 = CopyBundles\r | |
| 263 | \r | |
| 264 | UnchainHandlerDone:\r | |
| 265 | NESTED_RETURN\r | |
| 266 | \r | |
| 267 | .endp UnchainHandler\r | |
| 268 | \r | |
| 269 | \r | |
| 270 | /////////////////////////////////////////////\r | |
| 271 | //\r | |
| 272 | // Name:\r | |
| 273 | // CopyBundles\r | |
| 274 | //\r | |
| 275 | // Description:\r | |
| 276 | // Copies instruction bundles - flushes icache as necessary\r | |
| 277 | //\r | |
| 278 | // Arguments:\r | |
| 279 | // in0 - Bundle source\r | |
| 280 | // in1 - Bundle destination\r | |
| 281 | // in2 - Bundle count\r | |
| 282 | //\r | |
| 283 | // Returns:\r | |
| 284 | //\r | |
| 285 | // Notes:\r | |
| 286 | // This procedure is a leaf routine\r | |
| 287 | //\r | |
| 288 | .proc CopyBundles\r | |
| 289 | \r | |
| 290 | CopyBundles:\r | |
| 291 | \r | |
| 292 | NESTED_SETUP(3,2+1,0,0)\r | |
| 293 | \r | |
| 294 | shl in2=in2, 1;; // in2 = count of 8 byte blocks to copy\r | |
| 295 | \r | |
| 296 | CopyBundlesLoop:\r | |
| 297 | \r | |
| 298 | cmp.eq p14, p15 = 0, in2;; // Check if done\r | |
| 299 | (p14) br.sptk.few CopyBundlesDone;;\r | |
| 300 | \r | |
| 301 | ld8 loc2=[in0], 0x8;; // loc2 = source bytes\r | |
| 302 | st8 [in1]=loc2;; // [in1] = destination bytes\r | |
| 303 | fc in1;; // Flush instruction cache\r | |
| 304 | sync.i;; // Ensure local and remote data/inst caches in sync\r | |
| 305 | srlz.i;; // Ensure sync has been observed\r | |
| 306 | add in1=0x8, in1;; // in1 = next destination\r | |
| 307 | add in2=-1, in2;; // in2 = decrement 8 bytes blocks to copy\r | |
| 308 | br.sptk.few CopyBundlesLoop;;\r | |
| 309 | \r | |
| 310 | CopyBundlesDone:\r | |
| 311 | NESTED_RETURN\r | |
| 312 | \r | |
| 313 | .endp CopyBundles\r | |
| 314 | \r | |
| 315 | \r | |
| 316 | /////////////////////////////////////////////\r | |
| 317 | //\r | |
| 318 | // Name:\r | |
| 319 | // RelocateBundle\r | |
| 320 | //\r | |
| 321 | // Description:\r | |
| 322 | // Relocates an instruction bundle by updating any ip-relative branch instructions.\r | |
| 323 | //\r | |
| 324 | // Arguments:\r | |
| 325 | // in0 - Runtime address of bundle\r | |
| 326 | // in1 - IP address of previous location of bundle\r | |
| 327 | // in2 - IP address of new location of bundle\r | |
| 328 | //\r | |
| 329 | // Returns:\r | |
| 330 | // in0 - 1 if successful or 0 if unsuccessful\r | |
| 331 | //\r | |
| 332 | // Notes:\r | |
| 333 | // This routine examines all slots in the given bundle that are destined for the\r | |
| 334 | // branch execution unit. If any of these slots contain an IP-relative branch\r | |
| 335 | // namely instructions B1, B2, B3, or B6, the slot is fixed-up with a new relative\r | |
| 336 | // address. Errors can occur if a branch cannot be reached.\r | |
| 337 | //\r | |
| 338 | .proc RelocateBundle\r | |
| 339 | \r | |
| 340 | RelocateBundle:\r | |
| 341 | \r | |
| 342 | NESTED_SETUP(3,2+4,3,0)\r | |
| 343 | \r | |
| 344 | mov loc2=SLOT0 // loc2 = slot index\r | |
| 345 | mov loc5=in0;; // loc5 = runtime address of bundle\r | |
| 346 | mov in0=1;; // in0 = success\r | |
| 347 | \r | |
| 348 | RelocateBundleNextSlot:\r | |
| 349 | \r | |
| 350 | cmp.ge p14, p15 = SLOT2, loc2;; // Check if maximum slot\r | |
| 351 | (p15) br.sptk.few RelocateBundleDone\r | |
| 352 | \r | |
| 353 | mov out0=loc5;; // out0 = runtime address of bundle\r | |
| 354 | br.call.sptk.few b0 = GetTemplate\r | |
| 355 | mov loc3=out0;; // loc3 = instruction template\r | |
| 356 | mov out0=loc5 // out0 = runtime address of bundle\r | |
| 357 | mov out1=loc2;; // out1 = instruction slot number\r | |
| 358 | br.call.sptk.few b0 = GetSlot\r | |
| 359 | mov loc4=out0;; // loc4 = instruction encoding\r | |
| 360 | mov out0=loc4 // out0 = instuction encoding\r | |
| 361 | mov out1=loc2 // out1 = instruction slot number\r | |
| 362 | mov out2=loc3;; // out2 = instruction template\r | |
| 363 | br.call.sptk.few b0 = IsSlotBranch\r | |
| 364 | cmp.eq p14, p15 = 1, out0;; // Check if branch slot\r | |
| 365 | (p15) add loc2=1,loc2 // Increment slot\r | |
| 366 | (p15) br.sptk.few RelocateBundleNextSlot\r | |
| 367 | mov out0=loc4 // out0 = instuction encoding\r | |
| 368 | mov out1=in1 // out1 = IP address of previous location\r | |
| 369 | mov out2=in2;; // out2 = IP address of new location\r | |
| 370 | br.call.sptk.few b0 = RelocateSlot\r | |
| 371 | cmp.eq p14, p15 = 1, out1;; // Check if relocated slot\r | |
| 372 | (p15) mov in0=0 // in0 = failure\r | |
| 373 | (p15) br.sptk.few RelocateBundleDone\r | |
| 374 | mov out2=out0;; // out2 = instruction encoding\r | |
| 375 | mov out0=loc5 // out0 = runtime address of bundle\r | |
| 376 | mov out1=loc2;; // out1 = instruction slot number\r | |
| 377 | br.call.sptk.few b0 = SetSlot\r | |
| 378 | add loc2=1,loc2;; // Increment slot\r | |
| 379 | br.sptk.few RelocateBundleNextSlot\r | |
| 380 | \r | |
| 381 | RelocateBundleDone:\r | |
| 382 | NESTED_RETURN\r | |
| 383 | \r | |
| 384 | .endp RelocateBundle\r | |
| 385 | \r | |
| 386 | \r | |
| 387 | /////////////////////////////////////////////\r | |
| 388 | //\r | |
| 389 | // Name:\r | |
| 390 | // RelocateSlot\r | |
| 391 | //\r | |
| 392 | // Description:\r | |
| 393 | // Relocates an instruction bundle by updating any ip-relative branch instructions.\r | |
| 394 | //\r | |
| 395 | // Arguments:\r | |
| 396 | // in0 - Instruction encoding (41-bits, right justified)\r | |
| 397 | // in1 - IP address of previous location of bundle\r | |
| 398 | // in2 - IP address of new location of bundle\r | |
| 399 | //\r | |
| 400 | // Returns:\r | |
| 401 | // in0 - Instruction encoding (41-bits, right justified)\r | |
| 402 | // in1 - 1 if successful otherwise 0\r | |
| 403 | //\r | |
| 404 | // Notes:\r | |
| 405 | // This procedure is a leaf routine\r | |
| 406 | //\r | |
| 407 | .proc RelocateSlot\r | |
| 408 | \r | |
| 409 | RelocateSlot:\r | |
| 410 | NESTED_SETUP(3,2+5,0,0)\r | |
| 411 | extr.u loc2=in0, 37, 4;; // loc2 = instruction opcode\r | |
| 412 | cmp.eq p14, p15 = 4, loc2;; // IP-relative branch (B1) or\r | |
| 413 | // IP-relative counted branch (B2)\r | |
| 414 | (p15) cmp.eq p14, p15 = 5, loc2;; // IP-relative call (B3)\r | |
| 415 | (p15) cmp.eq p14, p15 = 7, loc2;; // IP-relative predict (B6)\r | |
| 416 | (p15) mov in1=1 // Instruction did not need to be reencoded\r | |
| 417 | (p15) br.sptk.few RelocateSlotDone\r | |
| 418 | tbit.nz p14, p15 = in0, 36;; // put relative offset sign bit in p14\r | |
| 419 | extr.u loc2=in0, 13, 20;; // loc2 = relative offset in instruction\r | |
| 420 | (p14) movl loc3=0xfffffffffff00000;; // extend sign\r | |
| 421 | (p14) or loc2=loc2, loc3;;\r | |
| 422 | shl loc2=loc2,4;; // convert to byte offset instead of bundle offset\r | |
| 423 | add loc3=loc2, in1;; // loc3 = physical address of branch target\r | |
| 424 | (p14) sub loc2=r0,loc2;; // flip sign in loc2 if offset is negative\r | |
| 425 | sub loc4=loc3,in2;; // loc4 = relative offset from new ip to branch target\r | |
| 7b414b4e | 426 | cmp.lt p15, p14 = 0, loc4;; // get new sign bit\r |
| c1f23d63 | 427 | (p14) sub loc5=r0,loc4 // get absolute value of offset\r |
| 428 | (p15) mov loc5=loc4;;\r | |
| 429 | movl loc6=0x0FFFFFF;; // maximum offset in bytes for ip-rel branch\r | |
| 430 | cmp.gt p14, p15 = loc5, loc6;; // check to see we're not out of range for an ip-relative branch\r | |
| 431 | (p14) br.sptk.few RelocateSlotError\r | |
| 432 | cmp.lt p15, p14 = 0, loc4;; // store sign in p14 again\r | |
| f8c9de87 | 433 | (p14) dep in0=-1,in0,36,1 // store sign bit in instruction\r |
| c1f23d63 | 434 | (p15) dep in0=0,in0,36,1\r |
| 435 | shr loc4=loc4, 4;; // convert back to bundle offset\r | |
| 436 | dep in0=loc4,in0,13,16;; // put first 16 bits of new offset into instruction\r | |
| 437 | shr loc4=loc4,16;;\r | |
| 438 | dep in0=loc4,in0,13+16,4 // put last 4 bits of new offset into instruction\r | |
| 439 | mov in1=1;; // in1 = success\r | |
| 440 | br.sptk.few RelocateSlotDone;;\r | |
| 441 | \r | |
| 442 | RelocateSlotError:\r | |
| 443 | mov in1=0;; // in1 = failure\r | |
| 444 | \r | |
| 445 | RelocateSlotDone:\r | |
| 446 | NESTED_RETURN\r | |
| 447 | \r | |
| 448 | .endp RelocateSlot\r | |
| 449 | \r | |
| 450 | \r | |
| 451 | /////////////////////////////////////////////\r | |
| 452 | //\r | |
| 453 | // Name:\r | |
| 454 | // IsSlotBranch\r | |
| 455 | //\r | |
| 456 | // Description:\r | |
| 457 | // Determines if the given instruction is a branch instruction.\r | |
| 458 | //\r | |
| 459 | // Arguments:\r | |
| 460 | // in0 - Instruction encoding (41-bits, right justified)\r | |
| 461 | // in1 - Instruction slot number\r | |
| 462 | // in2 - Bundle template\r | |
| 463 | //\r | |
| 464 | // Returns:\r | |
| 465 | // in0 - 1 if branch or 0 if not branch\r | |
| 466 | //\r | |
| 467 | // Notes:\r | |
| 468 | // This procedure is a leaf routine\r | |
| 469 | //\r | |
| 470 | // IsSlotBranch recognizes all branch instructions by looking at the provided template.\r | |
| 471 | // The instruction encoding is only passed to this routine for future expansion.\r | |
| 472 | //\r | |
| 473 | .proc IsSlotBranch\r | |
| 474 | \r | |
| 475 | IsSlotBranch:\r | |
| 476 | \r | |
| 477 | NESTED_SETUP (3,2+0,0,0)\r | |
| 478 | \r | |
| 479 | mov in0=1;; // in0 = 1 which destroys the instruction\r | |
| 480 | andcm in2=in2,in0;; // in2 = even template to reduce compares\r | |
| 481 | mov in0=0;; // in0 = not a branch\r | |
| 482 | cmp.eq p14, p15 = 0x16, in2;; // Template 0x16 is BBB\r | |
| 483 | (p14) br.sptk.few IsSlotBranchTrue\r | |
| 484 | cmp.eq p14, p15 = SLOT0, in1;; // Slot 0 has no other possiblities\r | |
| 485 | (p14) br.sptk.few IsSlotBranchDone\r | |
| 486 | cmp.eq p14, p15 = 0x12, in2;; // Template 0x12 is MBB\r | |
| 487 | (p14) br.sptk.few IsSlotBranchTrue\r | |
| 488 | cmp.eq p14, p15 = SLOT1, in1;; // Slot 1 has no other possiblities\r | |
| 489 | (p14) br.sptk.few IsSlotBranchDone\r | |
| 490 | cmp.eq p14, p15 = 0x10, in2;; // Template 0x10 is MIB\r | |
| 491 | (p14) br.sptk.few IsSlotBranchTrue\r | |
| 492 | cmp.eq p14, p15 = 0x18, in2;; // Template 0x18 is MMB\r | |
| 493 | (p14) br.sptk.few IsSlotBranchTrue\r | |
| 494 | cmp.eq p14, p15 = 0x1C, in2;; // Template 0x1C is MFB\r | |
| 495 | (p14) br.sptk.few IsSlotBranchTrue\r | |
| 496 | br.sptk.few IsSlotBranchDone\r | |
| 497 | \r | |
| 498 | IsSlotBranchTrue:\r | |
| 499 | mov in0=1;; // in0 = branch\r | |
| 500 | \r | |
| 501 | IsSlotBranchDone:\r | |
| 502 | NESTED_RETURN\r | |
| 503 | \r | |
| 504 | .endp IsSlotBranch\r | |
| 505 | \r | |
| 506 | \r | |
| 507 | /////////////////////////////////////////////\r | |
| 508 | //\r | |
| 509 | // Name:\r | |
| 510 | // GetTemplate\r | |
| 511 | //\r | |
| 512 | // Description:\r | |
| 513 | // Retrieves the instruction template for an instruction bundle\r | |
| 514 | //\r | |
| 515 | // Arguments:\r | |
| 516 | // in0 - Runtime address of bundle\r | |
| 517 | //\r | |
| 518 | // Returns:\r | |
| 519 | // in0 - Instruction template (5-bits, right-justified)\r | |
| 520 | //\r | |
| 521 | // Notes:\r | |
| 522 | // This procedure is a leaf routine\r | |
| 523 | //\r | |
| 524 | .proc GetTemplate\r | |
| 525 | \r | |
| 526 | GetTemplate:\r | |
| 527 | \r | |
| 528 | NESTED_SETUP (1,2+2,0,0)\r | |
| 529 | \r | |
| 530 | ld8 loc2=[in0], 0x8 // loc2 = first 8 bytes of branch bundle\r | |
| 531 | movl loc3=MASK_0_4;; // loc3 = template mask\r | |
| 532 | and loc2=loc2,loc3;; // loc2 = template, right justified\r | |
| 533 | mov in0=loc2;; // in0 = template, right justified\r | |
| 534 | \r | |
| 535 | NESTED_RETURN\r | |
| 536 | \r | |
| 537 | .endp GetTemplate\r | |
| 538 | \r | |
| 539 | \r | |
| 540 | /////////////////////////////////////////////\r | |
| 541 | //\r | |
| 542 | // Name:\r | |
| 543 | // GetSlot\r | |
| 544 | //\r | |
| 545 | // Description:\r | |
| 546 | // Gets the instruction encoding for an instruction slot and bundle\r | |
| 547 | //\r | |
| 548 | // Arguments:\r | |
| 549 | // in0 - Runtime address of bundle\r | |
| 550 | // in1 - Instruction slot (either 0, 1, or 2)\r | |
| 551 | //\r | |
| 552 | // Returns:\r | |
| 553 | // in0 - Instruction encoding (41-bits, right justified)\r | |
| 554 | //\r | |
| 555 | // Notes:\r | |
| 556 | // This procedure is a leaf routine\r | |
| 557 | //\r | |
| 558 | // Slot0 - [in0 + 0x8] Bits 45-5\r | |
| 559 | // Slot1 - [in0 + 0x8] Bits 63-46 and [in0] Bits 22-0\r | |
| 560 | // Slot2 - [in0] Bits 63-23\r | |
| 561 | //\r | |
| 562 | .proc GetSlot\r | |
| 563 | \r | |
| 564 | GetSlot:\r | |
| 565 | NESTED_SETUP (2,2+3,0,0)\r | |
| 566 | \r | |
| 567 | ld8 loc2=[in0], 0x8;; // loc2 = first 8 bytes of branch bundle\r | |
| 568 | ld8 loc3=[in0];; // loc3 = second 8 bytes of branch bundle\r | |
| 569 | cmp.eq p14, p15 = 2, in1;; // check if slot 2 specified\r | |
| 570 | (p14) br.cond.sptk.few GetSlot2;; // get slot 2\r | |
| 571 | cmp.eq p14, p15 = 1, in1;; // check if slot 1 specified\r | |
| 572 | (p14) br.cond.sptk.few GetSlot1;; // get slot 1\r | |
| 573 | \r | |
| 574 | GetSlot0:\r | |
| 575 | extr.u in0=loc2, 5, 45 // in0 = extracted slot 0\r | |
| 576 | br.sptk.few GetSlotDone;;\r | |
| 577 | \r | |
| 578 | GetSlot1:\r | |
| 579 | extr.u in0=loc2, 46, 18 // in0 = bits 63-46 of loc2 right-justified\r | |
| 580 | extr.u loc4=loc3, 0, 23;; // loc4 = bits 22-0 of loc3 right-justified\r | |
| 581 | dep in0=loc4, in0, 18, 15;;\r | |
| 582 | shr.u loc4=loc4,15;;\r | |
| 583 | dep in0=loc4, in0, 33, 8;; // in0 = extracted slot 1\r | |
| 584 | br.sptk.few GetSlotDone;;\r | |
| 585 | \r | |
| 586 | GetSlot2:\r | |
| 587 | extr.u in0=loc3, 23, 41;; // in0 = extracted slot 2\r | |
| 588 | \r | |
| 589 | GetSlotDone:\r | |
| 590 | NESTED_RETURN\r | |
| 591 | \r | |
| 592 | .endp GetSlot\r | |
| 593 | \r | |
| 594 | \r | |
| 595 | /////////////////////////////////////////////\r | |
| 596 | //\r | |
| 597 | // Name:\r | |
| 598 | // SetSlot\r | |
| 599 | //\r | |
| 600 | // Description:\r | |
| 601 | // Sets the instruction encoding for an instruction slot and bundle\r | |
| 602 | //\r | |
| 603 | // Arguments:\r | |
| 604 | // in0 - Runtime address of bundle\r | |
| 605 | // in1 - Instruction slot (either 0, 1, or 2)\r | |
| 606 | // in2 - Instruction encoding (41-bits, right justified)\r | |
| 607 | //\r | |
| 608 | // Returns:\r | |
| 609 | //\r | |
| 610 | // Notes:\r | |
| 611 | // This procedure is a leaf routine\r | |
| 612 | //\r | |
| 613 | .proc SetSlot\r | |
| 614 | \r | |
| 615 | SetSlot:\r | |
| 616 | NESTED_SETUP (3,2+3,0,0)\r | |
| 617 | \r | |
| 618 | ld8 loc2=[in0], 0x8;; // loc2 = first 8 bytes of bundle\r | |
| 619 | ld8 loc3=[in0];; // loc3 = second 8 bytes of bundle\r | |
| 620 | cmp.eq p14, p15 = 2, in1;; // check if slot 2 specified\r | |
| 621 | (p14) br.cond.sptk.few SetSlot2;; // set slot 2\r | |
| 622 | cmp.eq p14, p15 = 1, in1;; // check if slot 1 specified\r | |
| 623 | (p14) br.cond.sptk.few SetSlot1;; // set slot 1\r | |
| 624 | \r | |
| 625 | SetSlot0:\r | |
| 626 | dep loc2=0, loc2, 5, 41;; // remove old instruction from slot 0\r | |
| 627 | shl loc4=in2, 5;; // loc4 = new instruction ready to be inserted\r | |
| 628 | or loc2=loc2, loc4;; // loc2 = updated first 8 bytes of bundle\r | |
| 629 | add loc4=0x8,in0;; // loc4 = address to store first 8 bytes of bundle\r | |
| 630 | st8 [loc4]=loc2 // [loc4] = updated bundle\r | |
| 631 | br.sptk.few SetSlotDone;;\r | |
| 632 | ;;\r | |
| 633 | \r | |
| 634 | SetSlot1:\r | |
| 635 | dep loc2=0, loc2, 46, 18 // remove old instruction from slot 1\r | |
| 636 | dep loc3=0, loc3, 0, 23;;\r | |
| 637 | shl loc4=in2, 46;; // loc4 = partial instruction ready to be inserted\r | |
| 638 | or loc2=loc2, loc4;; // loc2 = updated first 8 bytes of bundle\r | |
| 639 | add loc4=0x8,in0;; // loc4 = address to store first 8 bytes of bundle\r | |
| 640 | st8 [loc4]=loc2;; // [loc4] = updated bundle\r | |
| 641 | shr.u loc4=in2, 18;; // loc4 = partial instruction ready to be inserted\r | |
| 642 | or loc3=loc3, loc4;; // loc3 = updated second 8 bytes of bundle\r | |
| 643 | st8 [in0]=loc3;; // [in0] = updated bundle\r | |
| 644 | br.sptk.few SetSlotDone;;\r | |
| 645 | \r | |
| 646 | SetSlot2:\r | |
| 647 | dep loc3=0, loc3, 23, 41;; // remove old instruction from slot 2\r | |
| 648 | shl loc4=in2, 23;; // loc4 = instruction ready to be inserted\r | |
| 649 | or loc3=loc3, loc4;; // loc3 = updated second 8 bytes of bundle\r | |
| 650 | st8 [in0]=loc3;; // [in0] = updated bundle\r | |
| 651 | \r | |
| 652 | SetSlotDone:\r | |
| 653 | \r | |
| 654 | NESTED_RETURN\r | |
| 655 | .endp SetSlot\r | |
| 656 | \r | |
| 657 | \r | |
| 658 | /////////////////////////////////////////////\r | |
| 659 | //\r | |
| 660 | // Name:\r | |
| 661 | // GetIva\r | |
| 662 | //\r | |
| 663 | // Description:\r | |
| 664 | // C callable function to obtain the current value of IVA\r | |
| 665 | //\r | |
| 666 | // Returns:\r | |
| 667 | // Current value if IVA\r | |
| 668 | \r | |
| 132f41f0 | 669 | ASM_GLOBAL GetIva\r |
| c1f23d63 | 670 | .proc GetIva\r |
| 671 | GetIva:\r | |
| 672 | mov r8=cr2;;\r | |
| 673 | br.ret.sptk.many b0\r | |
| 674 | \r | |
| 675 | .endp GetIva\r | |
| 676 | \r | |
| 677 | \r | |
| 678 | /////////////////////////////////////////////\r | |
| 679 | //\r | |
| 680 | // Name:\r | |
| 681 | // ProgramInterruptFlags\r | |
| 682 | //\r | |
| 683 | // Description:\r | |
| 684 | // C callable function to enable/disable interrupts\r | |
| 685 | //\r | |
| 686 | // Returns:\r | |
| 687 | // Previous state of psr.ic\r | |
| 688 | //\r | |
| 132f41f0 | 689 | ASM_GLOBAL ProgramInterruptFlags\r |
| c1f23d63 | 690 | .proc ProgramInterruptFlags\r |
| 691 | ProgramInterruptFlags:\r | |
| 692 | alloc loc0=1,2,0,0;;\r | |
| 693 | mov loc0=psr\r | |
| 694 | mov loc1=0x6000;;\r | |
| 695 | and r8=loc0, loc1 // obtain current psr.ic and psr.i state\r | |
| 696 | and in0=in0, loc1 // insure no extra bits set in input\r | |
| 697 | andcm loc0=loc0,loc1;; // clear original psr.i and psr.ic\r | |
| 698 | or loc0=loc0,in0;; // OR in new psr.ic value\r | |
| 699 | mov psr.l=loc0;; // write new psr\r | |
| 700 | srlz.d\r | |
| 701 | br.ret.sptk.many b0 // return\r | |
| 702 | \r | |
| 703 | .endp ProgramInterruptFlags\r | |
| 704 | \r | |
| 705 | \r | |
| 706 | /////////////////////////////////////////////\r | |
| 707 | //\r | |
| 708 | // Name:\r | |
| 709 | // SpillContext\r | |
| 710 | //\r | |
| 711 | // Description:\r | |
| 712 | // Saves system context to context record.\r | |
| 713 | //\r | |
| 714 | // Arguments:\r | |
| 715 | // in0 = 512 byte aligned context record address\r | |
| 716 | // in1 = original B0\r | |
| 717 | // in2 = original ar.bsp\r | |
| 718 | // in3 = original ar.bspstore\r | |
| 719 | // in4 = original ar.rnat\r | |
| 720 | // in5 = original ar.pfs\r | |
| 721 | //\r | |
| 722 | // Notes:\r | |
| 723 | // loc0 - scratch\r | |
| 724 | // loc1 - scratch\r | |
| 725 | // loc2 - temporary application unat storage\r | |
| 726 | // loc3 - temporary exception handler unat storage\r | |
| 727 | \r | |
| 728 | .proc SpillContext\r | |
| 729 | \r | |
| 730 | SpillContext:\r | |
| 731 | alloc loc0=6,4,0,0;; // alloc 6 input, 4 locals, 0 outs\r | |
| 732 | mov loc2=ar.unat;; // save application context unat (spilled later)\r | |
| 733 | mov ar.unat=r0;; // set UNAT=0\r | |
| 734 | st8.spill [in0]=r0,8;;\r | |
| 735 | st8.spill [in0]=r1,8;; // save R1 - R31\r | |
| 736 | st8.spill [in0]=r2,8;;\r | |
| 737 | st8.spill [in0]=r3,8;;\r | |
| 738 | st8.spill [in0]=r4,8;;\r | |
| 739 | st8.spill [in0]=r5,8;;\r | |
| 740 | st8.spill [in0]=r6,8;;\r | |
| 741 | st8.spill [in0]=r7,8;;\r | |
| 742 | st8.spill [in0]=r8,8;;\r | |
| 743 | st8.spill [in0]=r9,8;;\r | |
| 744 | st8.spill [in0]=r10,8;;\r | |
| 745 | st8.spill [in0]=r11,8;;\r | |
| 746 | st8.spill [in0]=r12,8;;\r | |
| 747 | st8.spill [in0]=r13,8;;\r | |
| 748 | st8.spill [in0]=r14,8;;\r | |
| 749 | st8.spill [in0]=r15,8;;\r | |
| 750 | st8.spill [in0]=r16,8;;\r | |
| 751 | st8.spill [in0]=r17,8;;\r | |
| 752 | st8.spill [in0]=r18,8;;\r | |
| 753 | st8.spill [in0]=r19,8;;\r | |
| 754 | st8.spill [in0]=r20,8;;\r | |
| 755 | st8.spill [in0]=r21,8;;\r | |
| 756 | st8.spill [in0]=r22,8;;\r | |
| 757 | st8.spill [in0]=r23,8;;\r | |
| 758 | st8.spill [in0]=r24,8;;\r | |
| 759 | st8.spill [in0]=r25,8;;\r | |
| 760 | st8.spill [in0]=r26,8;;\r | |
| 761 | st8.spill [in0]=r27,8;;\r | |
| 762 | st8.spill [in0]=r28,8;;\r | |
| 763 | st8.spill [in0]=r29,8;;\r | |
| 764 | st8.spill [in0]=r30,8;;\r | |
| 765 | st8.spill [in0]=r31,8;;\r | |
| 766 | mov loc3=ar.unat;; // save debugger context unat (spilled later)\r | |
| 767 | stf.spill [in0]=f2,16;; // save f2 - f31\r | |
| 768 | stf.spill [in0]=f3,16;;\r | |
| 769 | stf.spill [in0]=f4,16;;\r | |
| 770 | stf.spill [in0]=f5,16;;\r | |
| 771 | stf.spill [in0]=f6,16;;\r | |
| 772 | stf.spill [in0]=f7,16;;\r | |
| 773 | stf.spill [in0]=f8,16;;\r | |
| 774 | stf.spill [in0]=f9,16;;\r | |
| 775 | stf.spill [in0]=f10,16;;\r | |
| 776 | stf.spill [in0]=f11,16;;\r | |
| 777 | stf.spill [in0]=f12,16;;\r | |
| 778 | stf.spill [in0]=f13,16;;\r | |
| 779 | stf.spill [in0]=f14,16;;\r | |
| 780 | stf.spill [in0]=f15,16;;\r | |
| 781 | stf.spill [in0]=f16,16;;\r | |
| 782 | stf.spill [in0]=f17,16;;\r | |
| 783 | stf.spill [in0]=f18,16;;\r | |
| 784 | stf.spill [in0]=f19,16;;\r | |
| 785 | stf.spill [in0]=f20,16;;\r | |
| 786 | stf.spill [in0]=f21,16;;\r | |
| 787 | stf.spill [in0]=f22,16;;\r | |
| 788 | stf.spill [in0]=f23,16;;\r | |
| 789 | stf.spill [in0]=f24,16;;\r | |
| 790 | stf.spill [in0]=f25,16;;\r | |
| 791 | stf.spill [in0]=f26,16;;\r | |
| 792 | stf.spill [in0]=f27,16;;\r | |
| 793 | stf.spill [in0]=f28,16;;\r | |
| 794 | stf.spill [in0]=f29,16;;\r | |
| 795 | stf.spill [in0]=f30,16;;\r | |
| 796 | stf.spill [in0]=f31,16;;\r | |
| 797 | mov loc0=pr;; // save predicates\r | |
| 798 | st8.spill [in0]=loc0,8;;\r | |
| 799 | st8.spill [in0]=in1,8;; // save b0 - b7... in1 already equals saved b0\r | |
| 800 | mov loc0=b1;;\r | |
| 801 | st8.spill [in0]=loc0,8;;\r | |
| 802 | mov loc0=b2;;\r | |
| 803 | st8.spill [in0]=loc0,8;;\r | |
| 804 | mov loc0=b3;;\r | |
| 805 | st8.spill [in0]=loc0,8;;\r | |
| 806 | mov loc0=b4;;\r | |
| 807 | st8.spill [in0]=loc0,8;;\r | |
| 808 | mov loc0=b5;;\r | |
| 809 | st8.spill [in0]=loc0,8;;\r | |
| 810 | mov loc0=b6;;\r | |
| 811 | st8.spill [in0]=loc0,8;;\r | |
| 812 | mov loc0=b7;;\r | |
| 813 | st8.spill [in0]=loc0,8;;\r | |
| 814 | mov loc0=ar.rsc;; // save ar.rsc\r | |
| 815 | st8.spill [in0]=loc0,8;;\r | |
| 816 | st8.spill [in0]=in2,8;; // save ar.bsp (in2)\r | |
| 817 | st8.spill [in0]=in3,8;; // save ar.bspstore (in3)\r | |
| 818 | st8.spill [in0]=in4,8;; // save ar.rnat (in4)\r | |
| 819 | mov loc0=ar.fcr;; // save ar.fcr (ar21 - IA32 floating-point control register)\r | |
| 820 | st8.spill [in0]=loc0,8;;\r | |
| 821 | mov loc0=ar.eflag;; // save ar.eflag (ar24)\r | |
| 822 | st8.spill [in0]=loc0,8;;\r | |
| 823 | mov loc0=ar.csd;; // save ar.csd (ar25 - ia32 CS descriptor)\r | |
| 824 | st8.spill [in0]=loc0,8;;\r | |
| 825 | mov loc0=ar.ssd;; // save ar.ssd (ar26 - ia32 ss descriptor)\r | |
| 826 | st8.spill [in0]=loc0,8;;\r | |
| 827 | mov loc0=ar.cflg;; // save ar.cflg (ar27 - ia32 cr0 and cr4)\r | |
| 828 | st8.spill [in0]=loc0,8;;\r | |
| 829 | mov loc0=ar.fsr;; // save ar.fsr (ar28 - ia32 floating-point status register)\r | |
| 830 | st8.spill [in0]=loc0,8;;\r | |
| 831 | mov loc0=ar.fir;; // save ar.fir (ar29 - ia32 floating-point instruction register)\r | |
| 832 | st8.spill [in0]=loc0,8;;\r | |
| 833 | mov loc0=ar.fdr;; // save ar.fdr (ar30 - ia32 floating-point data register)\r | |
| 834 | st8.spill [in0]=loc0,8;;\r | |
| 835 | mov loc0=ar.ccv;; // save ar.ccv\r | |
| 836 | st8.spill [in0]=loc0,8;;\r | |
| 837 | st8.spill [in0]=loc2,8;; // save ar.unat (saved to loc2 earlier)\r | |
| 838 | mov loc0=ar.fpsr;; // save floating point status register\r | |
| 839 | st8.spill [in0]=loc0,8;;\r | |
| 840 | st8.spill [in0]=in5,8;; // save ar.pfs\r | |
| 841 | mov loc0=ar.lc;; // save ar.lc\r | |
| 842 | st8.spill [in0]=loc0,8;;\r | |
| 843 | mov loc0=ar.ec;; // save ar.ec\r | |
| 844 | st8.spill [in0]=loc0,8;;\r | |
| 845 | \r | |
| 846 | // save control registers\r | |
| 847 | mov loc0=cr.dcr;; // save dcr\r | |
| 848 | st8.spill [in0]=loc0,8;;\r | |
| 849 | mov loc0=cr.itm;; // save itm\r | |
| 850 | st8.spill [in0]=loc0,8;;\r | |
| 851 | mov loc0=cr.iva;; // save iva\r | |
| 852 | st8.spill [in0]=loc0,8;;\r | |
| 853 | mov loc0=cr.pta;; // save pta\r | |
| 854 | st8.spill [in0]=loc0,8;;\r | |
| 855 | mov loc0=cr.ipsr;; // save ipsr\r | |
| 856 | st8.spill [in0]=loc0,8;;\r | |
| 857 | mov loc0=cr.isr;; // save isr\r | |
| 858 | st8.spill [in0]=loc0,8;;\r | |
| 859 | mov loc0=cr.iip;; // save iip\r | |
| 860 | st8.spill [in0]=loc0,8;;\r | |
| 861 | mov loc0=cr.ifa;; // save ifa\r | |
| 862 | st8.spill [in0]=loc0,8;;\r | |
| 863 | mov loc0=cr.itir;; // save itir\r | |
| 864 | st8.spill [in0]=loc0,8;;\r | |
| 865 | mov loc0=cr.iipa;; // save iipa\r | |
| 866 | st8.spill [in0]=loc0,8;;\r | |
| 867 | mov loc0=cr.ifs;; // save ifs\r | |
| 868 | st8.spill [in0]=loc0,8;;\r | |
| 869 | mov loc0=cr.iim;; // save iim\r | |
| 870 | st8.spill [in0]=loc0,8;;\r | |
| 871 | mov loc0=cr.iha;; // save iha\r | |
| 872 | st8.spill [in0]=loc0,8;;\r | |
| 873 | \r | |
| 874 | // save debug registers\r | |
| 875 | mov loc0=dbr[r0];; // save dbr0 - dbr7\r | |
| 876 | st8.spill [in0]=loc0,8;;\r | |
| 877 | movl loc1=1;;\r | |
| 878 | mov loc0=dbr[loc1];;\r | |
| 879 | st8.spill [in0]=loc0,8;;\r | |
| 880 | movl loc1=2;;\r | |
| 881 | mov loc0=dbr[loc1];;\r | |
| 882 | st8.spill [in0]=loc0,8;;\r | |
| 883 | movl loc1=3;;\r | |
| 884 | mov loc0=dbr[loc1];;\r | |
| 885 | st8.spill [in0]=loc0,8;;\r | |
| 886 | movl loc1=4;;\r | |
| 887 | mov loc0=dbr[loc1];;\r | |
| 888 | st8.spill [in0]=loc0,8;;\r | |
| 889 | movl loc1=5;;\r | |
| 890 | mov loc0=dbr[loc1];;\r | |
| 891 | st8.spill [in0]=loc0,8;;\r | |
| 892 | movl loc1=6;;\r | |
| 893 | mov loc0=dbr[loc1];;\r | |
| 894 | st8.spill [in0]=loc0,8;;\r | |
| 895 | movl loc1=7;;\r | |
| 896 | mov loc0=dbr[loc1];;\r | |
| 897 | st8.spill [in0]=loc0,8;;\r | |
| 898 | mov loc0=ibr[r0];; // save ibr0 - ibr7\r | |
| 899 | st8.spill [in0]=loc0,8;;\r | |
| 900 | movl loc1=1;;\r | |
| 901 | mov loc0=ibr[loc1];;\r | |
| 902 | st8.spill [in0]=loc0,8;;\r | |
| 903 | movl loc1=2;;\r | |
| 904 | mov loc0=ibr[loc1];;\r | |
| 905 | st8.spill [in0]=loc0,8;;\r | |
| 906 | movl loc1=3;;\r | |
| 907 | mov loc0=ibr[loc1];;\r | |
| 908 | st8.spill [in0]=loc0,8;;\r | |
| 909 | movl loc1=4;;\r | |
| 910 | mov loc0=ibr[loc1];;\r | |
| 911 | st8.spill [in0]=loc0,8;;\r | |
| 912 | movl loc1=5;;\r | |
| 913 | mov loc0=ibr[loc1];;\r | |
| 914 | st8.spill [in0]=loc0,8;;\r | |
| 915 | movl loc1=6;;\r | |
| 916 | mov loc0=ibr[loc1];;\r | |
| 917 | st8.spill [in0]=loc0,8;;\r | |
| 918 | movl loc1=7;;\r | |
| 919 | mov loc0=ibr[loc1];;\r | |
| 920 | st8.spill [in0]=loc0,8;;\r | |
| 921 | st8.spill [in0]=loc3;;\r | |
| 922 | \r | |
| 923 | br.ret.sptk.few b0\r | |
| 924 | \r | |
| 925 | .endp SpillContext\r | |
| 926 | \r | |
| 927 | \r | |
| 928 | /////////////////////////////////////////////\r | |
| 929 | //\r | |
| 930 | // Name:\r | |
| 931 | // FillContext\r | |
| 932 | //\r | |
| 933 | // Description:\r | |
| 934 | // Restores register context from context record.\r | |
| 935 | //\r | |
| 936 | // Arguments:\r | |
| 937 | // in0 = address of last element 512 byte aligned context record address\r | |
| 938 | // in1 = modified B0\r | |
| 939 | // in2 = modified ar.bsp\r | |
| 940 | // in3 = modified ar.bspstore\r | |
| 941 | // in4 = modified ar.rnat\r | |
| 942 | // in5 = modified ar.pfs\r | |
| 943 | //\r | |
| 944 | // Notes:\r | |
| 945 | // loc0 - scratch\r | |
| 946 | // loc1 - scratch\r | |
| 947 | // loc2 - temporary application unat storage\r | |
| 948 | // loc3 - temporary exception handler unat storage\r | |
| 949 | \r | |
| 950 | .proc FillContext\r | |
| 951 | FillContext:\r | |
| 952 | alloc loc0=6,4,0,0;; // alloc 6 inputs, 4 locals, 0 outs\r | |
| 953 | ld8.fill loc3=[in0],-8;; // int_nat (nat bits for R1-31)\r | |
| 954 | movl loc1=7;; // ibr7\r | |
| 955 | ld8.fill loc0=[in0],-8;;\r | |
| 956 | mov ibr[loc1]=loc0;;\r | |
| 957 | movl loc1=6;; // ibr6\r | |
| 958 | ld8.fill loc0=[in0],-8;;\r | |
| 959 | mov ibr[loc1]=loc0;;\r | |
| 960 | movl loc1=5;; // ibr5\r | |
| 961 | ld8.fill loc0=[in0],-8;;\r | |
| 962 | mov ibr[loc1]=loc0;;\r | |
| 963 | movl loc1=4;; // ibr4\r | |
| 964 | ld8.fill loc0=[in0],-8;;\r | |
| 965 | mov ibr[loc1]=loc0;;\r | |
| 966 | movl loc1=3;; // ibr3\r | |
| 967 | ld8.fill loc0=[in0],-8;;\r | |
| 968 | mov ibr[loc1]=loc0;;\r | |
| 969 | movl loc1=2;; // ibr2\r | |
| 970 | ld8.fill loc0=[in0],-8;;\r | |
| 971 | mov ibr[loc1]=loc0;;\r | |
| 972 | movl loc1=1;; // ibr1\r | |
| 973 | ld8.fill loc0=[in0],-8;;\r | |
| 974 | mov ibr[loc1]=loc0;;\r | |
| 975 | ld8.fill loc0=[in0],-8;; // ibr0\r | |
| 976 | mov ibr[r0]=loc0;;\r | |
| 977 | movl loc1=7;; // dbr7\r | |
| 978 | ld8.fill loc0=[in0],-8;;\r | |
| 979 | mov dbr[loc1]=loc0;;\r | |
| 980 | movl loc1=6;; // dbr6\r | |
| 981 | ld8.fill loc0=[in0],-8;;\r | |
| 982 | mov dbr[loc1]=loc0;;\r | |
| 983 | movl loc1=5;; // dbr5\r | |
| 984 | ld8.fill loc0=[in0],-8;;\r | |
| 985 | mov dbr[loc1]=loc0;;\r | |
| 986 | movl loc1=4;; // dbr4\r | |
| 987 | ld8.fill loc0=[in0],-8;;\r | |
| 988 | mov dbr[loc1]=loc0;;\r | |
| 989 | movl loc1=3;; // dbr3\r | |
| 990 | ld8.fill loc0=[in0],-8;;\r | |
| 991 | mov dbr[loc1]=loc0;;\r | |
| 992 | movl loc1=2;; // dbr2\r | |
| 993 | ld8.fill loc0=[in0],-8;;\r | |
| 994 | mov dbr[loc1]=loc0;;\r | |
| 995 | movl loc1=1;; // dbr1\r | |
| 996 | ld8.fill loc0=[in0],-8;;\r | |
| 997 | mov dbr[loc1]=loc0;;\r | |
| 998 | ld8.fill loc0=[in0],-8;; // dbr0\r | |
| 999 | mov dbr[r0]=loc0;;\r | |
| 1000 | ld8.fill loc0=[in0],-8;; // iha\r | |
| 1001 | mov cr.iha=loc0;;\r | |
| 1002 | ld8.fill loc0=[in0],-8;; // iim\r | |
| 1003 | mov cr.iim=loc0;;\r | |
| 1004 | ld8.fill loc0=[in0],-8;; // ifs\r | |
| 1005 | mov cr.ifs=loc0;;\r | |
| 1006 | ld8.fill loc0=[in0],-8;; // iipa\r | |
| 1007 | mov cr.iipa=loc0;;\r | |
| 1008 | ld8.fill loc0=[in0],-8;; // itir\r | |
| 1009 | mov cr.itir=loc0;;\r | |
| 1010 | ld8.fill loc0=[in0],-8;; // ifa\r | |
| 1011 | mov cr.ifa=loc0;;\r | |
| 1012 | ld8.fill loc0=[in0],-8;; // iip\r | |
| 1013 | mov cr.iip=loc0;;\r | |
| 1014 | ld8.fill loc0=[in0],-8;; // isr\r | |
| 1015 | mov cr.isr=loc0;;\r | |
| 1016 | ld8.fill loc0=[in0],-8;; // ipsr\r | |
| 1017 | mov cr.ipsr=loc0;;\r | |
| 1018 | ld8.fill loc0=[in0],-8;; // pta\r | |
| 1019 | mov cr.pta=loc0;;\r | |
| 1020 | ld8.fill loc0=[in0],-8;; // iva\r | |
| 1021 | mov cr.iva=loc0;;\r | |
| 1022 | ld8.fill loc0=[in0],-8;; // itm\r | |
| 1023 | mov cr.itm=loc0;;\r | |
| 1024 | ld8.fill loc0=[in0],-8;; // dcr\r | |
| 1025 | mov cr.dcr=loc0;;\r | |
| 1026 | ld8.fill loc0=[in0],-8;; // ec\r | |
| 1027 | mov ar.ec=loc0;;\r | |
| 1028 | ld8.fill loc0=[in0],-8;; // lc\r | |
| 1029 | mov ar.lc=loc0;;\r | |
| 1030 | ld8.fill in5=[in0],-8;; // ar.pfs\r | |
| 1031 | ld8.fill loc0=[in0],-8;; // ar.fpsr\r | |
| 1032 | mov ar.fpsr=loc0;;\r | |
| 1033 | ld8.fill loc2=[in0],-8;; // ar.unat - restored later...\r | |
| 1034 | ld8.fill loc0=[in0],-8;; // ar.ccv\r | |
| 1035 | mov ar.ccv=loc0;;\r | |
| 1036 | ld8.fill loc0=[in0],-8;; // ar.fdr\r | |
| 1037 | mov ar.fdr=loc0;;\r | |
| 1038 | ld8.fill loc0=[in0],-8;; // ar.fir\r | |
| 1039 | mov ar.fir=loc0;;\r | |
| 1040 | ld8.fill loc0=[in0],-8;; // ar.fsr\r | |
| 1041 | mov ar.fsr=loc0;;\r | |
| 1042 | ld8.fill loc0=[in0],-8;; // ar.cflg\r | |
| 1043 | mov ar.cflg=loc0;;\r | |
| 1044 | ld8.fill loc0=[in0],-8;; // ar.ssd\r | |
| 1045 | mov ar.ssd=loc0;;\r | |
| 1046 | ld8.fill loc0=[in0],-8;; // ar.csd\r | |
| 1047 | mov ar.csd=loc0;;\r | |
| 1048 | ld8.fill loc0=[in0],-8;; // ar.eflag\r | |
| 1049 | mov ar.eflag=loc0;;\r | |
| 1050 | ld8.fill loc0=[in0],-8;; // ar.fcr\r | |
| 1051 | mov ar.fcr=loc0;;\r | |
| 1052 | ld8.fill in4=[in0],-8;; // ar.rnat\r | |
| 1053 | ld8.fill in3=[in0],-8;; // bspstore\r | |
| 1054 | ld8.fill in2=[in0],-8;; // bsp\r | |
| 1055 | ld8.fill loc0=[in0],-8;; // ar.rsc\r | |
| 1056 | mov ar.rsc=loc0;;\r | |
| 1057 | ld8.fill loc0=[in0],-8;; // B7 - B0\r | |
| 1058 | mov b7=loc0;;\r | |
| 1059 | ld8.fill loc0=[in0],-8;;\r | |
| 1060 | mov b6=loc0;;\r | |
| 1061 | ld8.fill loc0=[in0],-8;;\r | |
| 1062 | mov b5=loc0;;\r | |
| 1063 | ld8.fill loc0=[in0],-8;;\r | |
| 1064 | mov b4=loc0;;\r | |
| 1065 | ld8.fill loc0=[in0],-8;;\r | |
| 1066 | mov b3=loc0;;\r | |
| 1067 | ld8.fill loc0=[in0],-8;;\r | |
| 1068 | mov b2=loc0;;\r | |
| 1069 | ld8.fill loc0=[in0],-8;;\r | |
| 1070 | mov b1=loc0;;\r | |
| 1071 | ld8.fill in1=[in0],-8;; // b0 is temporarily stored in in1\r | |
| 1072 | ld8.fill loc0=[in0],-16;; // predicates\r | |
| 1073 | mov pr=loc0;;\r | |
| 1074 | ldf.fill f31=[in0],-16;;\r | |
| 1075 | ldf.fill f30=[in0],-16;;\r | |
| 1076 | ldf.fill f29=[in0],-16;;\r | |
| 1077 | ldf.fill f28=[in0],-16;;\r | |
| 1078 | ldf.fill f27=[in0],-16;;\r | |
| 1079 | ldf.fill f26=[in0],-16;;\r | |
| 1080 | ldf.fill f25=[in0],-16;;\r | |
| 1081 | ldf.fill f24=[in0],-16;;\r | |
| 1082 | ldf.fill f23=[in0],-16;;\r | |
| 1083 | ldf.fill f22=[in0],-16;;\r | |
| 1084 | ldf.fill f21=[in0],-16;;\r | |
| 1085 | ldf.fill f20=[in0],-16;;\r | |
| 1086 | ldf.fill f19=[in0],-16;;\r | |
| 1087 | ldf.fill f18=[in0],-16;;\r | |
| 1088 | ldf.fill f17=[in0],-16;;\r | |
| 1089 | ldf.fill f16=[in0],-16;;\r | |
| 1090 | ldf.fill f15=[in0],-16;;\r | |
| 1091 | ldf.fill f14=[in0],-16;;\r | |
| 1092 | ldf.fill f13=[in0],-16;;\r | |
| 1093 | ldf.fill f12=[in0],-16;;\r | |
| 1094 | ldf.fill f11=[in0],-16;;\r | |
| 1095 | ldf.fill f10=[in0],-16;;\r | |
| 1096 | ldf.fill f9=[in0],-16;;\r | |
| 1097 | ldf.fill f8=[in0],-16;;\r | |
| 1098 | ldf.fill f7=[in0],-16;;\r | |
| 1099 | ldf.fill f6=[in0],-16;;\r | |
| 1100 | ldf.fill f5=[in0],-16;;\r | |
| 1101 | ldf.fill f4=[in0],-16;;\r | |
| 1102 | ldf.fill f3=[in0],-16;;\r | |
| 1103 | ldf.fill f2=[in0],-8;;\r | |
| 1104 | mov ar.unat=loc3;; // restore unat (int_nat) before fill of general registers\r | |
| 1105 | ld8.fill r31=[in0],-8;;\r | |
| 1106 | ld8.fill r30=[in0],-8;;\r | |
| 1107 | ld8.fill r29=[in0],-8;;\r | |
| 1108 | ld8.fill r28=[in0],-8;;\r | |
| 1109 | ld8.fill r27=[in0],-8;;\r | |
| 1110 | ld8.fill r26=[in0],-8;;\r | |
| 1111 | ld8.fill r25=[in0],-8;;\r | |
| 1112 | ld8.fill r24=[in0],-8;;\r | |
| 1113 | ld8.fill r23=[in0],-8;;\r | |
| 1114 | ld8.fill r22=[in0],-8;;\r | |
| 1115 | ld8.fill r21=[in0],-8;;\r | |
| 1116 | ld8.fill r20=[in0],-8;;\r | |
| 1117 | ld8.fill r19=[in0],-8;;\r | |
| 1118 | ld8.fill r18=[in0],-8;;\r | |
| 1119 | ld8.fill r17=[in0],-8;;\r | |
| 1120 | ld8.fill r16=[in0],-8;;\r | |
| 1121 | ld8.fill r15=[in0],-8;;\r | |
| 1122 | ld8.fill r14=[in0],-8;;\r | |
| 1123 | ld8.fill r13=[in0],-8;;\r | |
| 1124 | ld8.fill r12=[in0],-8;;\r | |
| 1125 | ld8.fill r11=[in0],-8;;\r | |
| 1126 | ld8.fill r10=[in0],-8;;\r | |
| 1127 | ld8.fill r9=[in0],-8;;\r | |
| 1128 | ld8.fill r8=[in0],-8;;\r | |
| 1129 | ld8.fill r7=[in0],-8;;\r | |
| 1130 | ld8.fill r6=[in0],-8;;\r | |
| 1131 | ld8.fill r5=[in0],-8;;\r | |
| 1132 | ld8.fill r4=[in0],-8;;\r | |
| 1133 | ld8.fill r3=[in0],-8;;\r | |
| 1134 | ld8.fill r2=[in0],-8;;\r | |
| 1135 | ld8.fill r1=[in0],-8;;\r | |
| 1136 | mov ar.unat=loc2;; // restore application context unat\r | |
| 1137 | \r | |
| 1138 | br.ret.sptk.many b0\r | |
| 1139 | \r | |
| 1140 | .endp FillContext\r | |
| 1141 | \r | |
| 1142 | \r | |
| 1143 | /////////////////////////////////////////////\r | |
| 1144 | //\r | |
| 1145 | // Name:\r | |
| 1146 | // HookHandler\r | |
| 1147 | //\r | |
| 1148 | // Description:\r | |
| 1149 | // Common branch target from hooked IVT entries. Runs in interrupt context.\r | |
| 1150 | // Responsible for saving and restoring context and calling common C\r | |
| 1151 | // handler. Banked registers running on bank 0 at entry.\r | |
| 1152 | //\r | |
| 1153 | // Arguments:\r | |
| 1154 | // All arguments are passed in banked registers:\r | |
| 1155 | // B0_REG = Original B0\r | |
| 1156 | // SCRATCH_REG1 = IVT entry index\r | |
| 1157 | //\r | |
| 1158 | // Returns:\r | |
| 1159 | // Returns via rfi\r | |
| 1160 | //\r | |
| 1161 | // Notes:\r | |
| 1162 | // loc0 - scratch\r | |
| 1163 | // loc1 - scratch\r | |
| 1164 | // loc2 - vector number / mask\r | |
| 1165 | // loc3 - 16 byte aligned context record address\r | |
| 1166 | // loc4 - temporary storage of last address in context record\r | |
| 1167 | \r | |
| 1168 | HookHandler:\r | |
| 1169 | flushrs;; // Synch RSE with backing store\r | |
| 1170 | mov SCRATCH_REG2=ar.bsp // save interrupted context bsp\r | |
| 1171 | mov SCRATCH_REG3=ar.bspstore // save interrupted context bspstore\r | |
| 1172 | mov SCRATCH_REG4=ar.rnat // save interrupted context rnat\r | |
| 1173 | mov SCRATCH_REG6=cr.ifs;; // save IFS in case we need to chain...\r | |
| 1174 | cover;; // creates new frame, moves old\r | |
| 1175 | // CFM to IFS.\r | |
| 1176 | alloc SCRATCH_REG5=0,5,6,0 // alloc 5 locals, 6 outs\r | |
| 1177 | ;;\r | |
| 1178 | // save banked registers to locals\r | |
| 1179 | mov out1=B0_REG // out1 = Original B0\r | |
| 1180 | mov out2=SCRATCH_REG2 // out2 = original ar.bsp\r | |
| 1181 | mov out3=SCRATCH_REG3 // out3 = original ar.bspstore\r | |
| 1182 | mov out4=SCRATCH_REG4 // out4 = original ar.rnat\r | |
| 1183 | mov out5=SCRATCH_REG5 // out5 = original ar.pfs\r | |
| 1184 | mov loc2=SCRATCH_REG1;; // loc2 = vector number + chain flag\r | |
| 1185 | bsw.1;; // switch banked registers to bank 1\r | |
| 1186 | srlz.d // explicit serialize required\r | |
| 1187 | // now fill in context record structure\r | |
| 1188 | movl loc3=IpfContextBuf // Insure context record is aligned\r | |
| 1189 | add loc0=-0x200,r0;; // mask the lower 9 bits (align on 512 byte boundary)\r | |
| 1190 | and loc3=loc3,loc0;;\r | |
| 1191 | add loc3=0x200,loc3;; // move to next 512 byte boundary\r | |
| 1192 | // loc3 now contains the 512 byte aligned context record\r | |
| 1193 | // spill register context into context record\r | |
| 1194 | mov out0=loc3;; // Context record base in out0\r | |
| 1195 | // original B0 in out1 already\r | |
| 1196 | // original ar.bsp in out2 already\r | |
| 1197 | // original ar.bspstore in out3 already\r | |
| 1198 | br.call.sptk.few b0=SpillContext;; // spill context\r | |
| 1199 | mov loc4=out0 // save modified address\r | |
| 1200 | \r | |
| 1201 | // At this point, the context has been saved to the context record and we're\r | |
| 1202 | // ready to call the C part of the handler...\r | |
| 1203 | \r | |
| 1204 | movl loc0=CommonHandler;; // obtain address of plabel\r | |
| 1205 | ld8 loc1=[loc0];; // get entry point of CommonHandler\r | |
| 1206 | mov b6=loc1;; // put it in a branch register\r | |
| 1207 | adds loc1= 8, loc0;; // index to GP in plabel\r | |
| 1208 | ld8 r1=[loc1];; // set up gp for C call\r | |
| 1209 | mov loc1=0xfffff;; // mask off so only vector bits are present\r | |
| 1210 | and out0=loc2,loc1;; // pass vector number (exception type)\r | |
| 1211 | mov out1=loc3;; // pass context record address\r | |
| 1212 | br.call.sptk.few b0=b6;; // call C handler\r | |
| 1213 | \r | |
| 1214 | // We've returned from the C call, so restore the context and either rfi\r | |
| 1215 | // back to interrupted thread, or chain into the SAL if this was an external interrupt\r | |
| 1216 | mov out0=loc4;; // pass address of last element in context record\r | |
| 1217 | br.call.sptk.few b0=FillContext;; // Fill context\r | |
| 1218 | mov b0=out1 // fill in b0\r | |
| 1219 | mov ar.rnat=out4\r | |
| 1220 | mov ar.pfs=out5\r | |
| 1221 | \r | |
| 1222 | // Loadrs is necessary because the debugger may have changed some values in\r | |
| 1223 | // the backing store. The processor, however may not be aware that the\r | |
| 1224 | // stacked registers need to be reloaded from the backing store. Therefore,\r | |
| 1225 | // we explicitly cause the RSE to refresh the stacked register's contents\r | |
| 7b414b4e | 1226 | // from the backing store.\r |
| c1f23d63 | 1227 | mov loc0=ar.rsc // get RSC value\r |
| 1228 | mov loc1=ar.rsc // save it so we can restore it\r | |
| 1229 | movl loc3=0xffffffffc000ffff;; // create mask for clearing RSC.loadrs\r | |
| 1230 | and loc0=loc0,loc3;; // create value for RSC with RSC.loadrs==0\r | |
| 1231 | mov ar.rsc=loc0;; // modify RSC\r | |
| 1232 | loadrs;; // invalidate register stack\r | |
| 1233 | mov ar.rsc=loc1;; // restore original RSC\r | |
| 1234 | \r | |
| 1235 | bsw.0;; // switch banked registers back to bank 0\r | |
| 1236 | srlz.d;; // explicit serialize required\r | |
| 1237 | mov PR_REG=pr // save predicates - to be restored after chaining decision\r | |
| 1238 | mov B0_REG=b0 // save b0 - required by chain code\r | |
| 1239 | mov loc2=EXCPT_EXTERNAL_INTERRUPT;;\r | |
| 1240 | cmp.eq p7,p0=SCRATCH_REG1,loc2;; // check to see if this is the timer tick\r | |
| 1241 | (p7) br.cond.dpnt.few DO_CHAIN;;\r | |
| 1242 | \r | |
| 1243 | NO_CHAIN:\r | |
| 1244 | mov pr=PR_REG;;\r | |
| 1245 | rfi;; // we're outa here.\r | |
| 1246 | \r | |
| 1247 | DO_CHAIN:\r | |
| 1248 | mov pr=PR_REG\r | |
| 1249 | mov SCRATCH_REG1=cr.iva\r | |
| 1250 | mov SCRATCH_REG2=PATCH_RETURN_OFFSET;;\r | |
| 1251 | add SCRATCH_REG1=SCRATCH_REG1, SCRATCH_REG2;;\r | |
| 1252 | mov b0=SCRATCH_REG1;;\r | |
| 1253 | br.cond.sptk.few b0;;\r | |
| 1254 | \r | |
| 1255 | EndHookHandler:\r | |
| 1256 | \r | |
| 1257 | \r | |
| 1258 | /////////////////////////////////////////////\r | |
| 1259 | //\r | |
| 1260 | // Name:\r | |
| 1261 | // HookStub\r | |
| 1262 | //\r | |
| 1263 | // Description:\r | |
| 1264 | // HookStub will be copied from it's loaded location into the IVT when\r | |
| 1265 | // an IVT entry is hooked. The IVT entry does an indirect jump via B0 to\r | |
| 1266 | // HookHandler, which in turn calls into the default C handler, which calls\r | |
| 1267 | // the user-installed C handler. The calls return and HookHandler executes\r | |
| 1268 | // an rfi.\r | |
| 1269 | //\r | |
| 1270 | // Notes:\r | |
| 1271 | // Saves B0 to B0_REG\r | |
| 1272 | // Saves IVT index to SCRATCH_REG1 (immediate value is fixed up when code is copied\r | |
| 1273 | // to the IVT entry.\r | |
| 1274 | \r | |
| 132f41f0 | 1275 | ASM_GLOBAL HookStub\r |
| c1f23d63 | 1276 | .proc HookStub\r |
| 1277 | HookStub:\r | |
| 1278 | \r | |
| 1279 | mov B0_REG=b0\r | |
| 1280 | movl SCRATCH_REG1=HookHandler;;\r | |
| 1281 | mov b0=SCRATCH_REG1;;\r | |
| 1282 | mov SCRATCH_REG1=0;;// immediate value is fixed up during install of handler to be the vector number\r | |
| 1283 | br.cond.sptk.few b0\r | |
| 1284 | \r | |
| 1285 | .endp HookStub\r | |
| 1286 | \r | |
| 1287 | \r | |
| 1288 | /////////////////////////////////////////////\r | |
| 1289 | // The following code is moved into IVT entry 14 (offset 3400) which is reserved\r | |
| 1290 | // in the Itanium architecture. The patch code is located at the end of the\r | |
| 1291 | // IVT entry.\r | |
| 1292 | \r | |
| 1293 | PatchCode:\r | |
| 1294 | mov SCRATCH_REG0=psr\r | |
| 1295 | mov SCRATCH_REG6=cr.ipsr\r | |
| 1296 | mov PR_REG=pr\r | |
| 1297 | mov B0_REG=b0;;\r | |
| 1298 | \r | |
| 1299 | // turn off any virtual translations\r | |
| 1300 | movl SCRATCH_REG1 = ~( MASK(PSR_DT,1) | MASK(PSR_RT,1));;\r | |
| 1301 | and SCRATCH_REG1 = SCRATCH_REG0, SCRATCH_REG1;;\r | |
| 1302 | mov psr.l = SCRATCH_REG1;;\r | |
| 7b414b4e | 1303 | srlz.d\r |
| c1f23d63 | 1304 | tbit.z p14, p15 = SCRATCH_REG6, PSR_IS;; // Check to see if we were\r |
| 1305 | // interrupted from IA32\r | |
| 1306 | // context. If so, bail out\r | |
| 1307 | // and chain to SAL immediately\r | |
| 1308 | (p15) br.cond.sptk.few Stub_IVT_Passthru;;\r | |
| 1309 | // we only want to take 1 out of 32 external interrupts to minimize the\r | |
| 1310 | // impact to system performance. Check our interrupt count and bail\r | |
| 1311 | // out if we're not up to 32\r | |
| 1312 | movl SCRATCH_REG1=ExternalInterruptCount;;\r | |
| 1313 | ld8 SCRATCH_REG2=[SCRATCH_REG1];; // ExternalInterruptCount\r | |
| 1314 | tbit.z p14, p15 = SCRATCH_REG2, 5;; // bit 5 set?\r | |
| 1315 | (p14) add SCRATCH_REG2=1, SCRATCH_REG2;; // No? Then increment\r | |
| 1316 | // ExternalInterruptCount\r | |
| 1317 | // and Chain to SAL\r | |
| 1318 | // immediately\r | |
| 1319 | (p14) st8 [SCRATCH_REG1]=SCRATCH_REG2;;\r | |
| 1320 | (p14) br.cond.sptk.few Stub_IVT_Passthru;;\r | |
| 1321 | (p15) mov SCRATCH_REG2=0;; // Yes? Then reset\r | |
| 1322 | // ExternalInterruptCount\r | |
| 1323 | // and branch to\r | |
| 1324 | // HookHandler\r | |
| 1325 | (p15) st8 [SCRATCH_REG1]=SCRATCH_REG2;;\r | |
| 1326 | mov pr=PR_REG\r | |
| 1327 | movl SCRATCH_REG1=HookHandler;; // SCRATCH_REG1 = entrypoint of HookHandler\r | |
| 1328 | mov b0=SCRATCH_REG1;; // b0 = entrypoint of HookHandler\r | |
| 1329 | mov SCRATCH_REG1=EXCPT_EXTERNAL_INTERRUPT;;\r | |
| 1330 | br.sptk.few b0;; // branch to HookHandler\r | |
| 1331 | \r | |
| 1332 | PatchCodeRet:\r | |
| 1333 | // fake-up an rfi to get RSE back to being coherent and insure psr has\r | |
| 1334 | // original contents when interrupt occured, then exit to SAL\r | |
| 1335 | // at this point:\r | |
| 1336 | // cr.ifs has been modified by previous "cover"\r | |
| 1337 | // SCRATCH_REG6 has original cr.ifs\r | |
| 1338 | \r | |
| 1339 | mov SCRATCH_REG5=cr.ipsr\r | |
| 1340 | mov SCRATCH_REG4=cr.iip;;\r | |
| 1341 | mov cr.ipsr=SCRATCH_REG0\r | |
| 1342 | mov SCRATCH_REG1=ip;;\r | |
| 1343 | add SCRATCH_REG1=0x30, SCRATCH_REG1;;\r | |
| 1344 | mov cr.iip=SCRATCH_REG1;;\r | |
| 1345 | rfi;; // rfi to next instruction\r | |
| 1346 | \r | |
| 1347 | Stub_RfiTarget:\r | |
| 1348 | mov cr.ifs=SCRATCH_REG6\r | |
| 1349 | mov cr.ipsr=SCRATCH_REG5\r | |
| 1350 | mov cr.iip=SCRATCH_REG4;;\r | |
| 1351 | \r | |
| 1352 | Stub_IVT_Passthru:\r | |
| 1353 | mov pr=PR_REG // pr = saved predicate registers\r | |
| 1354 | mov b0=B0_REG;; // b0 = saved b0\r | |
| 1355 | EndPatchCode:\r | |
| 1356 | \r | |
| 1357 | \r | |
| 1358 | /////////////////////////////////////////////\r | |
| 1359 | // The following bundle is moved into IVT entry 14 (offset 0x3400) which is reserved\r | |
| 1360 | // in the Itanium architecture. This bundle will be the last bundle and will\r | |
| 1361 | // be located at offset 0x37F0 in the IVT.\r | |
| 1362 | \r | |
| 1363 | FailsafeBranch:\r | |
| 1364 | {\r | |
| 1365 | .mib\r | |
| 1366 | nop.m 0\r | |
| 1367 | nop.i 0\r | |
| 1368 | br.sptk.few -(FAILSAFE_BRANCH_OFFSET - EXT_INT_ENTRY_OFFSET - 0x10)\r | |
| 1369 | }\r | |
| 1370 | \r | |
| 1371 | \r | |
| 1372 | /////////////////////////////////////////////\r | |
| 1373 | // The following bundle is moved into IVT entry 13 (offset 0x3000) which is the\r | |
| 1374 | // external interrupt. It branches to the patch code.\r | |
| 1375 | \r | |
| 1376 | PatchCodeNewBun0:\r | |
| 1377 | {\r | |
| 1378 | .mib\r | |
| 1379 | nop.m 0\r | |
| 1380 | nop.i 0\r | |
| 1381 | br.cond.sptk.few PATCH_BRANCH\r | |
| 1382 | }\r |