projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 | 1 | /* |
| a23ba435 | 2 | * arch/sh/kernel/cpu/sh5/entry.S |
| 1da177e4 LT |
3 | * |
| 4 | * Copyright (C) 2000, 2001 Paolo Alberelli | |
| dbce1f64 | 5 | * Copyright (C) 2004 - 2008 Paul Mundt |
| a23ba435 | 6 | * Copyright (C) 2003, 2004 Richard Curnow |
| 1da177e4 | 7 | * |
| a23ba435 PM |
8 | * This file is subject to the terms and conditions of the GNU General Public |
| 9 | * License. See the file "COPYING" in the main directory of this archive | |
| 10 | * for more details. | |
| 1da177e4 | 11 | */ |
| 1da177e4 | 12 | #include <linux/errno.h> |
| 882016ff | 13 | #include <linux/init.h> |
| 1da177e4 | 14 | #include <linux/sys.h> |
| f15cbe6f | 15 | #include <cpu/registers.h> |
| 1da177e4 | 16 | #include <asm/processor.h> |
| 1da177e4 LT |
17 | #include <asm/unistd.h> |
| 18 | #include <asm/thread_info.h> | |
| 19 | #include <asm/asm-offsets.h> | |
| 20 | ||
| 21 | /* | |
| 22 | * SR fields. | |
| 23 | */ | |
| 24 | #define SR_ASID_MASK 0x00ff0000 | |
| 25 | #define SR_FD_MASK 0x00008000 | |
| 26 | #define SR_SS 0x08000000 | |
| 27 | #define SR_BL 0x10000000 | |
| 28 | #define SR_MD 0x40000000 | |
| 29 | ||
| 30 | /* | |
| 31 | * Event code. | |
| 32 | */ | |
| 33 | #define EVENT_INTERRUPT 0 | |
| 34 | #define EVENT_FAULT_TLB 1 | |
| 35 | #define EVENT_FAULT_NOT_TLB 2 | |
| 36 | #define EVENT_DEBUG 3 | |
| 37 | ||
| 38 | /* EXPEVT values */ | |
| 39 | #define RESET_CAUSE 0x20 | |
| 40 | #define DEBUGSS_CAUSE 0x980 | |
| 41 | ||
| 42 | /* | |
| 43 | * Frame layout. Quad index. | |
| 44 | */ | |
| 45 | #define FRAME_T(x) FRAME_TBASE+(x*8) | |
| 46 | #define FRAME_R(x) FRAME_RBASE+(x*8) | |
| 47 | #define FRAME_S(x) FRAME_SBASE+(x*8) | |
| 48 | #define FSPC 0 | |
| 49 | #define FSSR 1 | |
| 50 | #define FSYSCALL_ID 2 | |
| 51 | ||
| 52 | /* Arrange the save frame to be a multiple of 32 bytes long */ | |
| 53 | #define FRAME_SBASE 0 | |
| 54 | #define FRAME_RBASE (FRAME_SBASE+(3*8)) /* SYSCALL_ID - SSR - SPC */ | |
| 55 | #define FRAME_TBASE (FRAME_RBASE+(63*8)) /* r0 - r62 */ | |
| 56 | #define FRAME_PBASE (FRAME_TBASE+(8*8)) /* tr0 -tr7 */ | |
| 57 | #define FRAME_SIZE (FRAME_PBASE+(2*8)) /* pad0-pad1 */ | |
| 58 | ||
| 59 | #define FP_FRAME_SIZE FP_FRAME_BASE+(33*8) /* dr0 - dr31 + fpscr */ | |
| 60 | #define FP_FRAME_BASE 0 | |
| 61 | ||
| 62 | #define SAVED_R2 0*8 | |
| 63 | #define SAVED_R3 1*8 | |
| 64 | #define SAVED_R4 2*8 | |
| 65 | #define SAVED_R5 3*8 | |
| 66 | #define SAVED_R18 4*8 | |
| 67 | #define SAVED_R6 5*8 | |
| 68 | #define SAVED_TR0 6*8 | |
| 69 | ||
| 70 | /* These are the registers saved in the TLB path that aren't saved in the first | |
| 71 | level of the normal one. */ | |
| 72 | #define TLB_SAVED_R25 7*8 | |
| 73 | #define TLB_SAVED_TR1 8*8 | |
| 74 | #define TLB_SAVED_TR2 9*8 | |
| 75 | #define TLB_SAVED_TR3 10*8 | |
| 76 | #define TLB_SAVED_TR4 11*8 | |
| 77 | /* Save R0/R1 : PT-migrating compiler currently dishounours -ffixed-r0 and -ffixed-r1 causing | |
| 78 | breakage otherwise. */ | |
| 79 | #define TLB_SAVED_R0 12*8 | |
| 80 | #define TLB_SAVED_R1 13*8 | |
| 81 | ||
| 82 | #define CLI() \ | |
| 83 | getcon SR, r6; \ | |
| 84 | ori r6, 0xf0, r6; \ | |
| 85 | putcon r6, SR; | |
| 86 | ||
| 87 | #define STI() \ | |
| 88 | getcon SR, r6; \ | |
| 89 | andi r6, ~0xf0, r6; \ | |
| 90 | putcon r6, SR; | |
| 91 | ||
| 92 | #ifdef CONFIG_PREEMPT | |
| 93 | # define preempt_stop() CLI() | |
| 94 | #else | |
| 95 | # define preempt_stop() | |
| 96 | # define resume_kernel restore_all | |
| 97 | #endif | |
| 98 | ||
| 99 | .section .data, "aw" | |
| 100 | ||
| 101 | #define FAST_TLBMISS_STACK_CACHELINES 4 | |
| 102 | #define FAST_TLBMISS_STACK_QUADWORDS (4*FAST_TLBMISS_STACK_CACHELINES) | |
| 103 | ||
| 104 | /* Register back-up area for all exceptions */ | |
| 105 | .balign 32 | |
| 106 | /* Allow for 16 quadwords to be pushed by fast tlbmiss handling | |
| 107 | * register saves etc. */ | |
| 108 | .fill FAST_TLBMISS_STACK_QUADWORDS, 8, 0x0 | |
| 109 | /* This is 32 byte aligned by construction */ | |
| 110 | /* Register back-up area for all exceptions */ | |
| 111 | reg_save_area: | |
| 112 | .quad 0 | |
| 113 | .quad 0 | |
| 114 | .quad 0 | |
| 115 | .quad 0 | |
| 116 | ||
| 117 | .quad 0 | |
| 118 | .quad 0 | |
| 119 | .quad 0 | |
| 120 | .quad 0 | |
| 121 | ||
| 122 | .quad 0 | |
| 123 | .quad 0 | |
| 124 | .quad 0 | |
| 125 | .quad 0 | |
| 126 | ||
| 127 | .quad 0 | |
| 128 | .quad 0 | |
| 129 | ||
| 130 | /* Save area for RESVEC exceptions. We cannot use reg_save_area because of | |
| 131 | * reentrancy. Note this area may be accessed via physical address. | |
| 132 | * Align so this fits a whole single cache line, for ease of purging. | |
| 133 | */ | |
| 134 | .balign 32,0,32 | |
| 135 | resvec_save_area: | |
| 136 | .quad 0 | |
| 137 | .quad 0 | |
| 138 | .quad 0 | |
| 139 | .quad 0 | |
| 140 | .quad 0 | |
| 141 | .balign 32,0,32 | |
| 142 | ||
| 143 | /* Jump table of 3rd level handlers */ | |
| 144 | trap_jtable: | |
| 145 | .long do_exception_error /* 0x000 */ | |
| 146 | .long do_exception_error /* 0x020 */ | |
| ccd80587 | 147 | #ifdef CONFIG_MMU |
| 1da177e4 LT |
148 | .long tlb_miss_load /* 0x040 */ |
| 149 | .long tlb_miss_store /* 0x060 */ | |
| ccd80587 PM |
150 | #else |
| 151 | .long do_exception_error | |
| 152 | .long do_exception_error | |
| 153 | #endif | |
| 1da177e4 LT |
154 | ! ARTIFICIAL pseudo-EXPEVT setting |
| 155 | .long do_debug_interrupt /* 0x080 */ | |
| ccd80587 | 156 | #ifdef CONFIG_MMU |
| 1da177e4 LT |
157 | .long tlb_miss_load /* 0x0A0 */ |
| 158 | .long tlb_miss_store /* 0x0C0 */ | |
| ccd80587 PM |
159 | #else |
| 160 | .long do_exception_error | |
| 161 | .long do_exception_error | |
| 162 | #endif | |
| 1da177e4 LT |
163 | .long do_address_error_load /* 0x0E0 */ |
| 164 | .long do_address_error_store /* 0x100 */ | |
| 165 | #ifdef CONFIG_SH_FPU | |
| 166 | .long do_fpu_error /* 0x120 */ | |
| 167 | #else | |
| 168 | .long do_exception_error /* 0x120 */ | |
| 169 | #endif | |
| 170 | .long do_exception_error /* 0x140 */ | |
| 171 | .long system_call /* 0x160 */ | |
| 172 | .long do_reserved_inst /* 0x180 */ | |
| 173 | .long do_illegal_slot_inst /* 0x1A0 */ | |
| 92b59258 | 174 | .long do_exception_error /* 0x1C0 - NMI */ |
| 1da177e4 LT |
175 | .long do_exception_error /* 0x1E0 */ |
| 176 | .rept 15 | |
| 177 | .long do_IRQ /* 0x200 - 0x3C0 */ | |
| 178 | .endr | |
| 179 | .long do_exception_error /* 0x3E0 */ | |
| 180 | .rept 32 | |
| 181 | .long do_IRQ /* 0x400 - 0x7E0 */ | |
| 182 | .endr | |
| 183 | .long fpu_error_or_IRQA /* 0x800 */ | |
| 184 | .long fpu_error_or_IRQB /* 0x820 */ | |
| 185 | .long do_IRQ /* 0x840 */ | |
| 186 | .long do_IRQ /* 0x860 */ | |
| 187 | .rept 6 | |
| 188 | .long do_exception_error /* 0x880 - 0x920 */ | |
| 189 | .endr | |
| a4ae2b2b | 190 | .long breakpoint_trap_handler /* 0x940 */ |
| 1da177e4 LT |
191 | .long do_exception_error /* 0x960 */ |
| 192 | .long do_single_step /* 0x980 */ | |
| 193 | ||
| 194 | .rept 3 | |
| 195 | .long do_exception_error /* 0x9A0 - 0x9E0 */ | |
| 196 | .endr | |
| 197 | .long do_IRQ /* 0xA00 */ | |
| 198 | .long do_IRQ /* 0xA20 */ | |
| ccd80587 | 199 | #ifdef CONFIG_MMU |
| 1da177e4 | 200 | .long itlb_miss_or_IRQ /* 0xA40 */ |
| ccd80587 PM |
201 | #else |
| 202 | .long do_IRQ | |
| 203 | #endif | |
| 1da177e4 LT |
204 | .long do_IRQ /* 0xA60 */ |
| 205 | .long do_IRQ /* 0xA80 */ | |
| ccd80587 | 206 | #ifdef CONFIG_MMU |
| 1da177e4 | 207 | .long itlb_miss_or_IRQ /* 0xAA0 */ |
| ccd80587 PM |
208 | #else |
| 209 | .long do_IRQ | |
| 210 | #endif | |
| 1da177e4 LT |
211 | .long do_exception_error /* 0xAC0 */ |
| 212 | .long do_address_error_exec /* 0xAE0 */ | |
| 213 | .rept 8 | |
| 214 | .long do_exception_error /* 0xB00 - 0xBE0 */ | |
| 215 | .endr | |
| 216 | .rept 18 | |
| 217 | .long do_IRQ /* 0xC00 - 0xE20 */ | |
| 218 | .endr | |
| 219 | ||
| 220 | .section .text64, "ax" | |
| 221 | ||
| 222 | /* | |
| 223 | * --- Exception/Interrupt/Event Handling Section | |
| 224 | */ | |
| 225 | ||
| 226 | /* | |
| 227 | * VBR and RESVEC blocks. | |
| 228 | * | |
| 229 | * First level handler for VBR-based exceptions. | |
| 230 | * | |
| 231 | * To avoid waste of space, align to the maximum text block size. | |
| 232 | * This is assumed to be at most 128 bytes or 32 instructions. | |
| 233 | * DO NOT EXCEED 32 instructions on the first level handlers ! | |
| 234 | * | |
| 235 | * Also note that RESVEC is contained within the VBR block | |
| 236 | * where the room left (1KB - TEXT_SIZE) allows placing | |
| 237 | * the RESVEC block (at most 512B + TEXT_SIZE). | |
| 238 | * | |
| 239 | * So first (and only) level handler for RESVEC-based exceptions. | |
| 240 | * | |
| 241 | * Where the fault/interrupt is handled (not_a_tlb_miss, tlb_miss | |
| 242 | * and interrupt) we are a lot tight with register space until | |
| 243 | * saving onto the stack frame, which is done in handle_exception(). | |
| 244 | * | |
| 245 | */ | |
| 246 | ||
| 247 | #define TEXT_SIZE 128 | |
| 248 | #define BLOCK_SIZE 1664 /* Dynamic check, 13*128 */ | |
| 249 | ||
| 250 | .balign TEXT_SIZE | |
| 251 | LVBR_block: | |
| 252 | .space 256, 0 /* Power-on class handler, */ | |
| 253 | /* not required here */ | |
| 254 | not_a_tlb_miss: | |
| 255 | synco /* TAKum03020 (but probably a good idea anyway.) */ | |
| 256 | /* Save original stack pointer into KCR1 */ | |
| 257 | putcon SP, KCR1 | |
| 258 | ||
| 259 | /* Save other original registers into reg_save_area */ | |
| 260 | movi reg_save_area, SP | |
| 261 | st.q SP, SAVED_R2, r2 | |
| 262 | st.q SP, SAVED_R3, r3 | |
| 263 | st.q SP, SAVED_R4, r4 | |
| 264 | st.q SP, SAVED_R5, r5 | |
| 265 | st.q SP, SAVED_R6, r6 | |
| 266 | st.q SP, SAVED_R18, r18 | |
| 267 | gettr tr0, r3 | |
| 268 | st.q SP, SAVED_TR0, r3 | |
| 269 | ||
| 270 | /* Set args for Non-debug, Not a TLB miss class handler */ | |
| 271 | getcon EXPEVT, r2 | |
| 272 | movi ret_from_exception, r3 | |
| 273 | ori r3, 1, r3 | |
| 274 | movi EVENT_FAULT_NOT_TLB, r4 | |
| 275 | or SP, ZERO, r5 | |
| 276 | getcon KCR1, SP | |
| 277 | pta handle_exception, tr0 | |
| 278 | blink tr0, ZERO | |
| 279 | ||
| 280 | .balign 256 | |
| 281 | ! VBR+0x200 | |
| 282 | nop | |
| 283 | .balign 256 | |
| 284 | ! VBR+0x300 | |
| 285 | nop | |
| 286 | .balign 256 | |
| 287 | /* | |
| 288 | * Instead of the natural .balign 1024 place RESVEC here | |
| 289 | * respecting the final 1KB alignment. | |
| 290 | */ | |
| 291 | .balign TEXT_SIZE | |
| 292 | /* | |
| 293 | * Instead of '.space 1024-TEXT_SIZE' place the RESVEC | |
| 294 | * block making sure the final alignment is correct. | |
| 295 | */ | |
| ccd80587 | 296 | #ifdef CONFIG_MMU |
| 1da177e4 LT |
297 | tlb_miss: |
| 298 | synco /* TAKum03020 (but probably a good idea anyway.) */ | |
| 299 | putcon SP, KCR1 | |
| 300 | movi reg_save_area, SP | |
| 301 | /* SP is guaranteed 32-byte aligned. */ | |
| 302 | st.q SP, TLB_SAVED_R0 , r0 | |
| 303 | st.q SP, TLB_SAVED_R1 , r1 | |
| 304 | st.q SP, SAVED_R2 , r2 | |
| 305 | st.q SP, SAVED_R3 , r3 | |
| 306 | st.q SP, SAVED_R4 , r4 | |
| 307 | st.q SP, SAVED_R5 , r5 | |
| 308 | st.q SP, SAVED_R6 , r6 | |
| 309 | st.q SP, SAVED_R18, r18 | |
| 310 | ||
| 311 | /* Save R25 for safety; as/ld may want to use it to achieve the call to | |
| 312 | * the code in mm/tlbmiss.c */ | |
| 313 | st.q SP, TLB_SAVED_R25, r25 | |
| 314 | gettr tr0, r2 | |
| 315 | gettr tr1, r3 | |
| 316 | gettr tr2, r4 | |
| 317 | gettr tr3, r5 | |
| 318 | gettr tr4, r18 | |
| 319 | st.q SP, SAVED_TR0 , r2 | |
| 320 | st.q SP, TLB_SAVED_TR1 , r3 | |
| 321 | st.q SP, TLB_SAVED_TR2 , r4 | |
| 322 | st.q SP, TLB_SAVED_TR3 , r5 | |
| 323 | st.q SP, TLB_SAVED_TR4 , r18 | |
| 324 | ||
| 325 | pt do_fast_page_fault, tr0 | |
| 326 | getcon SSR, r2 | |
| 327 | getcon EXPEVT, r3 | |
| 328 | getcon TEA, r4 | |
| 329 | shlri r2, 30, r2 | |
| 330 | andi r2, 1, r2 /* r2 = SSR.MD */ | |
| 331 | blink tr0, LINK | |
| 332 | ||
| 333 | pt fixup_to_invoke_general_handler, tr1 | |
| 334 | ||
| 335 | /* If the fast path handler fixed the fault, just drop through quickly | |
| 336 | to the restore code right away to return to the excepting context. | |
| 337 | */ | |
| 4de51856 | 338 | bnei/u r2, 0, tr1 |
| 1da177e4 LT |
339 | |
| 340 | fast_tlb_miss_restore: | |
| 341 | ld.q SP, SAVED_TR0, r2 | |
| 342 | ld.q SP, TLB_SAVED_TR1, r3 | |
| 343 | ld.q SP, TLB_SAVED_TR2, r4 | |
| 344 | ||
| 345 | ld.q SP, TLB_SAVED_TR3, r5 | |
| 346 | ld.q SP, TLB_SAVED_TR4, r18 | |
| 347 | ||
| 348 | ptabs r2, tr0 | |
| 349 | ptabs r3, tr1 | |
| 350 | ptabs r4, tr2 | |
| 351 | ptabs r5, tr3 | |
| 352 | ptabs r18, tr4 | |
| 353 | ||
| 354 | ld.q SP, TLB_SAVED_R0, r0 | |
| 355 | ld.q SP, TLB_SAVED_R1, r1 | |
| 356 | ld.q SP, SAVED_R2, r2 | |
| 357 | ld.q SP, SAVED_R3, r3 | |
| 358 | ld.q SP, SAVED_R4, r4 | |
| 359 | ld.q SP, SAVED_R5, r5 | |
| 360 | ld.q SP, SAVED_R6, r6 | |
| 361 | ld.q SP, SAVED_R18, r18 | |
| 362 | ld.q SP, TLB_SAVED_R25, r25 | |
| 363 | ||
| 364 | getcon KCR1, SP | |
| 365 | rte | |
| 366 | nop /* for safety, in case the code is run on sh5-101 cut1.x */ | |
| 367 | ||
| 368 | fixup_to_invoke_general_handler: | |
| 369 | ||
| 370 | /* OK, new method. Restore stuff that's not expected to get saved into | |
| 371 | the 'first-level' reg save area, then just fall through to setting | |
| 372 | up the registers and calling the second-level handler. */ | |
| 373 | ||
| 374 | /* 2nd level expects r2,3,4,5,6,18,tr0 to be saved. So we must restore | |
| 375 | r25,tr1-4 and save r6 to get into the right state. */ | |
| 376 | ||
| 377 | ld.q SP, TLB_SAVED_TR1, r3 | |
| 378 | ld.q SP, TLB_SAVED_TR2, r4 | |
| 379 | ld.q SP, TLB_SAVED_TR3, r5 | |
| 380 | ld.q SP, TLB_SAVED_TR4, r18 | |
| 381 | ld.q SP, TLB_SAVED_R25, r25 | |
| 382 | ||
| 383 | ld.q SP, TLB_SAVED_R0, r0 | |
| 384 | ld.q SP, TLB_SAVED_R1, r1 | |
| 385 | ||
| 386 | ptabs/u r3, tr1 | |
| 387 | ptabs/u r4, tr2 | |
| 388 | ptabs/u r5, tr3 | |
| 389 | ptabs/u r18, tr4 | |
| 390 | ||
| 391 | /* Set args for Non-debug, TLB miss class handler */ | |
| 392 | getcon EXPEVT, r2 | |
| 393 | movi ret_from_exception, r3 | |
| 394 | ori r3, 1, r3 | |
| 395 | movi EVENT_FAULT_TLB, r4 | |
| 396 | or SP, ZERO, r5 | |
| 397 | getcon KCR1, SP | |
| 398 | pta handle_exception, tr0 | |
| 399 | blink tr0, ZERO | |
| ccd80587 PM |
400 | #else /* CONFIG_MMU */ |
| 401 | .balign 256 | |
| 402 | #endif | |
| 1da177e4 LT |
403 | |
| 404 | /* NB TAKE GREAT CARE HERE TO ENSURE THAT THE INTERRUPT CODE | |
| 405 | DOES END UP AT VBR+0x600 */ | |
| 406 | nop | |
| 407 | nop | |
| 408 | nop | |
| 409 | nop | |
| 410 | nop | |
| 411 | nop | |
| 412 | ||
| 413 | .balign 256 | |
| 414 | /* VBR + 0x600 */ | |
| 415 | ||
| 416 | interrupt: | |
| 417 | synco /* TAKum03020 (but probably a good idea anyway.) */ | |
| 418 | /* Save original stack pointer into KCR1 */ | |
| 419 | putcon SP, KCR1 | |
| 420 | ||
| 421 | /* Save other original registers into reg_save_area */ | |
| 422 | movi reg_save_area, SP | |
| 423 | st.q SP, SAVED_R2, r2 | |
| 424 | st.q SP, SAVED_R3, r3 | |
| 425 | st.q SP, SAVED_R4, r4 | |
| 426 | st.q SP, SAVED_R5, r5 | |
| 427 | st.q SP, SAVED_R6, r6 | |
| 428 | st.q SP, SAVED_R18, r18 | |
| 429 | gettr tr0, r3 | |
| 430 | st.q SP, SAVED_TR0, r3 | |
| 431 | ||
| 432 | /* Set args for interrupt class handler */ | |
| 433 | getcon INTEVT, r2 | |
| 434 | movi ret_from_irq, r3 | |
| 435 | ori r3, 1, r3 | |
| 436 | movi EVENT_INTERRUPT, r4 | |
| 437 | or SP, ZERO, r5 | |
| 438 | getcon KCR1, SP | |
| 439 | pta handle_exception, tr0 | |
| 440 | blink tr0, ZERO | |
| 441 | .balign TEXT_SIZE /* let's waste the bare minimum */ | |
| 442 | ||
| 443 | LVBR_block_end: /* Marker. Used for total checking */ | |
| 444 | ||
| 445 | .balign 256 | |
| 446 | LRESVEC_block: | |
| 447 | /* Panic handler. Called with MMU off. Possible causes/actions: | |
| 448 | * - Reset: Jump to program start. | |
| 449 | * - Single Step: Turn off Single Step & return. | |
| 450 | * - Others: Call panic handler, passing PC as arg. | |
| 451 | * (this may need to be extended...) | |
| 452 | */ | |
| 453 | reset_or_panic: | |
| 454 | synco /* TAKum03020 (but probably a good idea anyway.) */ | |
| 455 | putcon SP, DCR | |
| 456 | /* First save r0-1 and tr0, as we need to use these */ | |
| 36763b22 | 457 | movi resvec_save_area-CONFIG_PAGE_OFFSET, SP |
| 1da177e4 LT |
458 | st.q SP, 0, r0 |
| 459 | st.q SP, 8, r1 | |
| 460 | gettr tr0, r0 | |
| 461 | st.q SP, 32, r0 | |
| 462 | ||
| 463 | /* Check cause */ | |
| 464 | getcon EXPEVT, r0 | |
| 465 | movi RESET_CAUSE, r1 | |
| 466 | sub r1, r0, r1 /* r1=0 if reset */ | |
| 36763b22 | 467 | movi _stext-CONFIG_PAGE_OFFSET, r0 |
| 1da177e4 LT |
468 | ori r0, 1, r0 |
| 469 | ptabs r0, tr0 | |
| 470 | beqi r1, 0, tr0 /* Jump to start address if reset */ | |
| 471 | ||
| 472 | getcon EXPEVT, r0 | |
| 473 | movi DEBUGSS_CAUSE, r1 | |
| 474 | sub r1, r0, r1 /* r1=0 if single step */ | |
| 475 | pta single_step_panic, tr0 | |
| 476 | beqi r1, 0, tr0 /* jump if single step */ | |
| 477 | ||
| 478 | /* Now jump to where we save the registers. */ | |
| 36763b22 | 479 | movi panic_stash_regs-CONFIG_PAGE_OFFSET, r1 |
| 1da177e4 LT |
480 | ptabs r1, tr0 |
| 481 | blink tr0, r63 | |
| 482 | ||
| 483 | single_step_panic: | |
| 484 | /* We are in a handler with Single Step set. We need to resume the | |
| 485 | * handler, by turning on MMU & turning off Single Step. */ | |
| 486 | getcon SSR, r0 | |
| 487 | movi SR_MMU, r1 | |
| 488 | or r0, r1, r0 | |
| 489 | movi ~SR_SS, r1 | |
| 490 | and r0, r1, r0 | |
| 491 | putcon r0, SSR | |
| 492 | /* Restore EXPEVT, as the rte won't do this */ | |
| 493 | getcon PEXPEVT, r0 | |
| 494 | putcon r0, EXPEVT | |
| 495 | /* Restore regs */ | |
| 496 | ld.q SP, 32, r0 | |
| 497 | ptabs r0, tr0 | |
| 498 | ld.q SP, 0, r0 | |
| 499 | ld.q SP, 8, r1 | |
| 500 | getcon DCR, SP | |
| 501 | synco | |
| 502 | rte | |
| 503 | ||
| 504 | ||
| 505 | .balign 256 | |
| 506 | debug_exception: | |
| 507 | synco /* TAKum03020 (but probably a good idea anyway.) */ | |
| 508 | /* | |
| 509 | * Single step/software_break_point first level handler. | |
| 510 | * Called with MMU off, so the first thing we do is enable it | |
| 511 | * by doing an rte with appropriate SSR. | |
| 512 | */ | |
| 513 | putcon SP, DCR | |
| 514 | /* Save SSR & SPC, together with R0 & R1, as we need to use 2 regs. */ | |
| 36763b22 | 515 | movi resvec_save_area-CONFIG_PAGE_OFFSET, SP |
| 1da177e4 LT |
516 | |
| 517 | /* With the MMU off, we are bypassing the cache, so purge any | |
| 518 | * data that will be made stale by the following stores. | |
| 519 | */ | |
| 520 | ocbp SP, 0 | |
| 521 | synco | |
| 522 | ||
| 523 | st.q SP, 0, r0 | |
| 524 | st.q SP, 8, r1 | |
| 525 | getcon SPC, r0 | |
| 526 | st.q SP, 16, r0 | |
| 527 | getcon SSR, r0 | |
| 528 | st.q SP, 24, r0 | |
| 529 | ||
| 530 | /* Enable MMU, block exceptions, set priv mode, disable single step */ | |
| 531 | movi SR_MMU | SR_BL | SR_MD, r1 | |
| 532 | or r0, r1, r0 | |
| 533 | movi ~SR_SS, r1 | |
| 534 | and r0, r1, r0 | |
| 535 | putcon r0, SSR | |
| 536 | /* Force control to debug_exception_2 when rte is executed */ | |
| 537 | movi debug_exeception_2, r0 | |
| 538 | ori r0, 1, r0 /* force SHmedia, just in case */ | |
| 539 | putcon r0, SPC | |
| 540 | getcon DCR, SP | |
| 541 | synco | |
| 542 | rte | |
| 543 | debug_exeception_2: | |
| 544 | /* Restore saved regs */ | |
| 545 | putcon SP, KCR1 | |
| 546 | movi resvec_save_area, SP | |
| 547 | ld.q SP, 24, r0 | |
| 548 | putcon r0, SSR | |
| 549 | ld.q SP, 16, r0 | |
| 550 | putcon r0, SPC | |
| 551 | ld.q SP, 0, r0 | |
| 552 | ld.q SP, 8, r1 | |
| 553 | ||
| 554 | /* Save other original registers into reg_save_area */ | |
| 555 | movi reg_save_area, SP | |
| 556 | st.q SP, SAVED_R2, r2 | |
| 557 | st.q SP, SAVED_R3, r3 | |
| 558 | st.q SP, SAVED_R4, r4 | |
| 559 | st.q SP, SAVED_R5, r5 | |
| 560 | st.q SP, SAVED_R6, r6 | |
| 561 | st.q SP, SAVED_R18, r18 | |
| 562 | gettr tr0, r3 | |
| 563 | st.q SP, SAVED_TR0, r3 | |
| 564 | ||
| 565 | /* Set args for debug class handler */ | |
| 566 | getcon EXPEVT, r2 | |
| 567 | movi ret_from_exception, r3 | |
| 568 | ori r3, 1, r3 | |
| 569 | movi EVENT_DEBUG, r4 | |
| 570 | or SP, ZERO, r5 | |
| 571 | getcon KCR1, SP | |
| 572 | pta handle_exception, tr0 | |
| 573 | blink tr0, ZERO | |
| 574 | ||
| 575 | .balign 256 | |
| 576 | debug_interrupt: | |
| 577 | /* !!! WE COME HERE IN REAL MODE !!! */ | |
| 578 | /* Hook-up debug interrupt to allow various debugging options to be | |
| 579 | * hooked into its handler. */ | |
| 580 | /* Save original stack pointer into KCR1 */ | |
| 581 | synco | |
| 582 | putcon SP, KCR1 | |
| 36763b22 | 583 | movi resvec_save_area-CONFIG_PAGE_OFFSET, SP |
| 1da177e4 LT |
584 | ocbp SP, 0 |
| 585 | ocbp SP, 32 | |
| 586 | synco | |
| 587 | ||
| 588 | /* Save other original registers into reg_save_area thru real addresses */ | |
| 589 | st.q SP, SAVED_R2, r2 | |
| 590 | st.q SP, SAVED_R3, r3 | |
| 591 | st.q SP, SAVED_R4, r4 | |
| 592 | st.q SP, SAVED_R5, r5 | |
| 593 | st.q SP, SAVED_R6, r6 | |
| 594 | st.q SP, SAVED_R18, r18 | |
| 595 | gettr tr0, r3 | |
| 596 | st.q SP, SAVED_TR0, r3 | |
| 597 | ||
| 598 | /* move (spc,ssr)->(pspc,pssr). The rte will shift | |
| 599 | them back again, so that they look like the originals | |
| 600 | as far as the real handler code is concerned. */ | |
| 601 | getcon spc, r6 | |
| 602 | putcon r6, pspc | |
| 603 | getcon ssr, r6 | |
| 604 | putcon r6, pssr | |
| 605 | ||
| 606 | ! construct useful SR for handle_exception | |
| 607 | movi 3, r6 | |
| 608 | shlli r6, 30, r6 | |
| 609 | getcon sr, r18 | |
| 610 | or r18, r6, r6 | |
| 611 | putcon r6, ssr | |
| 612 | ||
| 613 | ! SSR is now the current SR with the MD and MMU bits set | |
| 614 | ! i.e. the rte will switch back to priv mode and put | |
| 615 | ! the mmu back on | |
| 616 | ||
| 617 | ! construct spc | |
| 618 | movi handle_exception, r18 | |
| 619 | ori r18, 1, r18 ! for safety (do we need this?) | |
| 620 | putcon r18, spc | |
| 621 | ||
| 622 | /* Set args for Non-debug, Not a TLB miss class handler */ | |
| 623 | ||
| 624 | ! EXPEVT==0x80 is unused, so 'steal' this value to put the | |
| 625 | ! debug interrupt handler in the vectoring table | |
| 626 | movi 0x80, r2 | |
| 627 | movi ret_from_exception, r3 | |
| 628 | ori r3, 1, r3 | |
| 629 | movi EVENT_FAULT_NOT_TLB, r4 | |
| 630 | ||
| 631 | or SP, ZERO, r5 | |
| 36763b22 | 632 | movi CONFIG_PAGE_OFFSET, r6 |
| 1da177e4 LT |
633 | add r6, r5, r5 |
| 634 | getcon KCR1, SP | |
| 635 | ||
| 636 | synco ! for safety | |
| 637 | rte ! -> handle_exception, switch back to priv mode again | |
| 638 | ||
| 639 | LRESVEC_block_end: /* Marker. Unused. */ | |
| 640 | ||
| 641 | .balign TEXT_SIZE | |
| 642 | ||
| 643 | /* | |
| 644 | * Second level handler for VBR-based exceptions. Pre-handler. | |
| 645 | * In common to all stack-frame sensitive handlers. | |
| 646 | * | |
| 647 | * Inputs: | |
| 648 | * (KCR0) Current [current task union] | |
| 649 | * (KCR1) Original SP | |
| 650 | * (r2) INTEVT/EXPEVT | |
| 651 | * (r3) appropriate return address | |
| 652 | * (r4) Event (0 = interrupt, 1 = TLB miss fault, 2 = Not TLB miss fault, 3=debug) | |
| 653 | * (r5) Pointer to reg_save_area | |
| 654 | * (SP) Original SP | |
| 655 | * | |
| 656 | * Available registers: | |
| 657 | * (r6) | |
| 658 | * (r18) | |
| 659 | * (tr0) | |
| 660 | * | |
| 661 | */ | |
| 662 | handle_exception: | |
| 663 | /* Common 2nd level handler. */ | |
| 664 | ||
| 665 | /* First thing we need an appropriate stack pointer */ | |
| 666 | getcon SSR, r6 | |
| 667 | shlri r6, 30, r6 | |
| 668 | andi r6, 1, r6 | |
| 669 | pta stack_ok, tr0 | |
| 670 | bne r6, ZERO, tr0 /* Original stack pointer is fine */ | |
| 671 | ||
| 672 | /* Set stack pointer for user fault */ | |
| 673 | getcon KCR0, SP | |
| 674 | movi THREAD_SIZE, r6 /* Point to the end */ | |
| 675 | add SP, r6, SP | |
| 676 | ||
| 677 | stack_ok: | |
| 678 | ||
| 679 | /* DEBUG : check for underflow/overflow of the kernel stack */ | |
| 680 | pta no_underflow, tr0 | |
| 681 | getcon KCR0, r6 | |
| 682 | movi 1024, r18 | |
| 683 | add r6, r18, r6 | |
| 684 | bge SP, r6, tr0 ! ? below 1k from bottom of stack : danger zone | |
| 685 | ||
| 686 | /* Just panic to cause a crash. */ | |
| 687 | bad_sp: | |
| 688 | ld.b r63, 0, r6 | |
| 689 | nop | |
| 690 | ||
| 691 | no_underflow: | |
| 692 | pta bad_sp, tr0 | |
| 693 | getcon kcr0, r6 | |
| 694 | movi THREAD_SIZE, r18 | |
| 695 | add r18, r6, r6 | |
| 696 | bgt SP, r6, tr0 ! sp above the stack | |
| 697 | ||
| 698 | /* Make some room for the BASIC frame. */ | |
| 699 | movi -(FRAME_SIZE), r6 | |
| 700 | add SP, r6, SP | |
| 701 | ||
| 702 | /* Could do this with no stalling if we had another spare register, but the | |
| 703 | code below will be OK. */ | |
| 704 | ld.q r5, SAVED_R2, r6 | |
| 705 | ld.q r5, SAVED_R3, r18 | |
| 706 | st.q SP, FRAME_R(2), r6 | |
| 707 | ld.q r5, SAVED_R4, r6 | |
| 708 | st.q SP, FRAME_R(3), r18 | |
| 709 | ld.q r5, SAVED_R5, r18 | |
| 710 | st.q SP, FRAME_R(4), r6 | |
| 711 | ld.q r5, SAVED_R6, r6 | |
| 712 | st.q SP, FRAME_R(5), r18 | |
| 713 | ld.q r5, SAVED_R18, r18 | |
| 714 | st.q SP, FRAME_R(6), r6 | |
| 715 | ld.q r5, SAVED_TR0, r6 | |
| 716 | st.q SP, FRAME_R(18), r18 | |
| 717 | st.q SP, FRAME_T(0), r6 | |
| 718 | ||
| 719 | /* Keep old SP around */ | |
| 720 | getcon KCR1, r6 | |
| 721 | ||
| 722 | /* Save the rest of the general purpose registers */ | |
| 723 | st.q SP, FRAME_R(0), r0 | |
| 724 | st.q SP, FRAME_R(1), r1 | |
| 725 | st.q SP, FRAME_R(7), r7 | |
| 726 | st.q SP, FRAME_R(8), r8 | |
| 727 | st.q SP, FRAME_R(9), r9 | |
| 728 | st.q SP, FRAME_R(10), r10 | |
| 729 | st.q SP, FRAME_R(11), r11 | |
| 730 | st.q SP, FRAME_R(12), r12 | |
| 731 | st.q SP, FRAME_R(13), r13 | |
| 732 | st.q SP, FRAME_R(14), r14 | |
| 733 | ||
| 734 | /* SP is somewhere else */ | |
| 735 | st.q SP, FRAME_R(15), r6 | |
| 736 | ||
| 737 | st.q SP, FRAME_R(16), r16 | |
| 738 | st.q SP, FRAME_R(17), r17 | |
| 739 | /* r18 is saved earlier. */ | |
| 740 | st.q SP, FRAME_R(19), r19 | |
| 741 | st.q SP, FRAME_R(20), r20 | |
| 742 | st.q SP, FRAME_R(21), r21 | |
| 743 | st.q SP, FRAME_R(22), r22 | |
| 744 | st.q SP, FRAME_R(23), r23 | |
| 745 | st.q SP, FRAME_R(24), r24 | |
| 746 | st.q SP, FRAME_R(25), r25 | |
| 747 | st.q SP, FRAME_R(26), r26 | |
| 748 | st.q SP, FRAME_R(27), r27 | |
| 749 | st.q SP, FRAME_R(28), r28 | |
| 750 | st.q SP, FRAME_R(29), r29 | |
| 751 | st.q SP, FRAME_R(30), r30 | |
| 752 | st.q SP, FRAME_R(31), r31 | |
| 753 | st.q SP, FRAME_R(32), r32 | |
| 754 | st.q SP, FRAME_R(33), r33 | |
| 755 | st.q SP, FRAME_R(34), r34 | |
| 756 | st.q SP, FRAME_R(35), r35 | |
| 757 | st.q SP, FRAME_R(36), r36 | |
| 758 | st.q SP, FRAME_R(37), r37 | |
| 759 | st.q SP, FRAME_R(38), r38 | |
| 760 | st.q SP, FRAME_R(39), r39 | |
| 761 | st.q SP, FRAME_R(40), r40 | |
| 762 | st.q SP, FRAME_R(41), r41 | |
| 763 | st.q SP, FRAME_R(42), r42 | |
| 764 | st.q SP, FRAME_R(43), r43 | |
| 765 | st.q SP, FRAME_R(44), r44 | |
| 766 | st.q SP, FRAME_R(45), r45 | |
| 767 | st.q SP, FRAME_R(46), r46 | |
| 768 | st.q SP, FRAME_R(47), r47 | |
| 769 | st.q SP, FRAME_R(48), r48 | |
| 770 | st.q SP, FRAME_R(49), r49 | |
| 771 | st.q SP, FRAME_R(50), r50 | |
| 772 | st.q SP, FRAME_R(51), r51 | |
| 773 | st.q SP, FRAME_R(52), r52 | |
| 774 | st.q SP, FRAME_R(53), r53 | |
| 775 | st.q SP, FRAME_R(54), r54 | |
| 776 | st.q SP, FRAME_R(55), r55 | |
| 777 | st.q SP, FRAME_R(56), r56 | |
| 778 | st.q SP, FRAME_R(57), r57 | |
| 779 | st.q SP, FRAME_R(58), r58 | |
| 780 | st.q SP, FRAME_R(59), r59 | |
| 781 | st.q SP, FRAME_R(60), r60 | |
| 782 | st.q SP, FRAME_R(61), r61 | |
| 783 | st.q SP, FRAME_R(62), r62 | |
| 784 | ||
| 785 | /* | |
| 786 | * Save the S* registers. | |
| 787 | */ | |
| 788 | getcon SSR, r61 | |
| 789 | st.q SP, FRAME_S(FSSR), r61 | |
| 790 | getcon SPC, r62 | |
| 791 | st.q SP, FRAME_S(FSPC), r62 | |
| 792 | movi -1, r62 /* Reset syscall_nr */ | |
| 793 | st.q SP, FRAME_S(FSYSCALL_ID), r62 | |
| 794 | ||
| 795 | /* Save the rest of the target registers */ | |
| 796 | gettr tr1, r6 | |
| 797 | st.q SP, FRAME_T(1), r6 | |
| 798 | gettr tr2, r6 | |
| 799 | st.q SP, FRAME_T(2), r6 | |
| 800 | gettr tr3, r6 | |
| 801 | st.q SP, FRAME_T(3), r6 | |
| 802 | gettr tr4, r6 | |
| 803 | st.q SP, FRAME_T(4), r6 | |
| 804 | gettr tr5, r6 | |
| 805 | st.q SP, FRAME_T(5), r6 | |
| 806 | gettr tr6, r6 | |
| 807 | st.q SP, FRAME_T(6), r6 | |
| 808 | gettr tr7, r6 | |
| 809 | st.q SP, FRAME_T(7), r6 | |
| 810 | ||
| 811 | ! setup FP so that unwinder can wind back through nested kernel mode | |
| 812 | ! exceptions | |
| 813 | add SP, ZERO, r14 | |
| 814 | ||
| 1da177e4 LT |
815 | /* For syscall and debug race condition, get TRA now */ |
| 816 | getcon TRA, r5 | |
| 817 | ||
| 818 | /* We are in a safe position to turn SR.BL off, but set IMASK=0xf | |
| 819 | * Also set FD, to catch FPU usage in the kernel. | |
| 820 | * | |
| 821 | * benedict.gaster@superh.com 29/07/2002 | |
| 822 | * | |
| 823 | * On all SH5-101 revisions it is unsafe to raise the IMASK and at the | |
| 824 | * same time change BL from 1->0, as any pending interrupt of a level | |
| 825 | * higher than he previous value of IMASK will leak through and be | |
| 826 | * taken unexpectedly. | |
| 827 | * | |
| 828 | * To avoid this we raise the IMASK and then issue another PUTCON to | |
| 829 | * enable interrupts. | |
| 830 | */ | |
| 831 | getcon SR, r6 | |
| 832 | movi SR_IMASK | SR_FD, r7 | |
| 833 | or r6, r7, r6 | |
| 834 | putcon r6, SR | |
| 835 | movi SR_UNBLOCK_EXC, r7 | |
| 836 | and r6, r7, r6 | |
| 837 | putcon r6, SR | |
| 838 | ||
| 839 | ||
| 840 | /* Now call the appropriate 3rd level handler */ | |
| 841 | or r3, ZERO, LINK | |
| 842 | movi trap_jtable, r3 | |
| 843 | shlri r2, 3, r2 | |
| 844 | ldx.l r2, r3, r3 | |
| 845 | shlri r2, 2, r2 | |
| 846 | ptabs r3, tr0 | |
| 847 | or SP, ZERO, r3 | |
| 848 | blink tr0, ZERO | |
| 849 | ||
| 850 | /* | |
| 851 | * Second level handler for VBR-based exceptions. Post-handlers. | |
| 852 | * | |
| 853 | * Post-handlers for interrupts (ret_from_irq), exceptions | |
| 854 | * (ret_from_exception) and common reentrance doors (restore_all | |
| 855 | * to get back to the original context, ret_from_syscall loop to | |
| 856 | * check kernel exiting). | |
| 857 | * | |
| 858 | * ret_with_reschedule and work_notifysig are an inner lables of | |
| 859 | * the ret_from_syscall loop. | |
| 860 | * | |
| 861 | * In common to all stack-frame sensitive handlers. | |
| 862 | * | |
| 863 | * Inputs: | |
| 864 | * (SP) struct pt_regs *, original register's frame pointer (basic) | |
| 865 | * | |
| 866 | */ | |
| 867 | .global ret_from_irq | |
| 868 | ret_from_irq: | |
| 1da177e4 LT |
869 | ld.q SP, FRAME_S(FSSR), r6 |
| 870 | shlri r6, 30, r6 | |
| 871 | andi r6, 1, r6 | |
| 872 | pta resume_kernel, tr0 | |
| 873 | bne r6, ZERO, tr0 /* no further checks */ | |
| 874 | STI() | |
| 875 | pta ret_with_reschedule, tr0 | |
| 876 | blink tr0, ZERO /* Do not check softirqs */ | |
| 877 | ||
| 878 | .global ret_from_exception | |
| 879 | ret_from_exception: | |
| 880 | preempt_stop() | |
| 881 | ||
| 1da177e4 LT |
882 | ld.q SP, FRAME_S(FSSR), r6 |
| 883 | shlri r6, 30, r6 | |
| 884 | andi r6, 1, r6 | |
| 885 | pta resume_kernel, tr0 | |
| 886 | bne r6, ZERO, tr0 /* no further checks */ | |
| 887 | ||
| 888 | /* Check softirqs */ | |
| 889 | ||
| 890 | #ifdef CONFIG_PREEMPT | |
| 891 | pta ret_from_syscall, tr0 | |
| 892 | blink tr0, ZERO | |
| 893 | ||
| 894 | resume_kernel: | |
| dbce1f64 PM |
895 | CLI() |
| 896 | ||
| 1da177e4 LT |
897 | pta restore_all, tr0 |
| 898 | ||
| 899 | getcon KCR0, r6 | |
| 900 | ld.l r6, TI_PRE_COUNT, r7 | |
| 901 | beq/u r7, ZERO, tr0 | |
| 902 | ||
| 903 | need_resched: | |
| 904 | ld.l r6, TI_FLAGS, r7 | |
| 905 | movi (1 << TIF_NEED_RESCHED), r8 | |
| 906 | and r8, r7, r8 | |
| 907 | bne r8, ZERO, tr0 | |
| 908 | ||
| 909 | getcon SR, r7 | |
| 910 | andi r7, 0xf0, r7 | |
| 911 | bne r7, ZERO, tr0 | |
| 912 | ||
| dbce1f64 | 913 | movi preempt_schedule_irq, r7 |
| 1da177e4 LT |
914 | ori r7, 1, r7 |
| 915 | ptabs r7, tr1 | |
| 916 | blink tr1, LINK | |
| 917 | ||
| 1da177e4 LT |
918 | pta need_resched, tr1 |
| 919 | blink tr1, ZERO | |
| 920 | #endif | |
| 921 | ||
| 922 | .global ret_from_syscall | |
| 923 | ret_from_syscall: | |
| 924 | ||
| 925 | ret_with_reschedule: | |
| 926 | getcon KCR0, r6 ! r6 contains current_thread_info | |
| 927 | ld.l r6, TI_FLAGS, r7 ! r7 contains current_thread_info->flags | |
| 928 | ||
| c18fe9a0 | 929 | movi _TIF_NEED_RESCHED, r8 |
| 1da177e4 LT |
930 | and r8, r7, r8 |
| 931 | pta work_resched, tr0 | |
| 932 | bne r8, ZERO, tr0 | |
| 933 | ||
| 934 | pta restore_all, tr1 | |
| 935 | ||
| 56bfc42f | 936 | movi _TIF_SIGPENDING, r8 |
| 1da177e4 LT |
937 | and r8, r7, r8 |
| 938 | pta work_notifysig, tr0 | |
| 939 | bne r8, ZERO, tr0 | |
| 940 | ||
| 941 | blink tr1, ZERO | |
| 942 | ||
| 943 | work_resched: | |
| 944 | pta ret_from_syscall, tr0 | |
| 945 | gettr tr0, LINK | |
| 946 | movi schedule, r6 | |
| 947 | ptabs r6, tr0 | |
| 948 | blink tr0, ZERO /* Call schedule(), return on top */ | |
| 949 | ||
| 950 | work_notifysig: | |
| 951 | gettr tr1, LINK | |
| 952 | ||
| ab99c733 | 953 | movi do_notify_resume, r6 |
| 1da177e4 LT |
954 | ptabs r6, tr0 |
| 955 | or SP, ZERO, r2 | |
| ab99c733 PM |
956 | or r7, ZERO, r3 |
| 957 | blink tr0, LINK /* Call do_notify_resume(regs, current_thread_info->flags), return here */ | |
| 1da177e4 LT |
958 | |
| 959 | restore_all: | |
| 960 | /* Do prefetches */ | |
| 961 | ||
| 962 | ld.q SP, FRAME_T(0), r6 | |
| 963 | ld.q SP, FRAME_T(1), r7 | |
| 964 | ld.q SP, FRAME_T(2), r8 | |
| 965 | ld.q SP, FRAME_T(3), r9 | |
| 966 | ptabs r6, tr0 | |
| 967 | ptabs r7, tr1 | |
| 968 | ptabs r8, tr2 | |
| 969 | ptabs r9, tr3 | |
| 970 | ld.q SP, FRAME_T(4), r6 | |
| 971 | ld.q SP, FRAME_T(5), r7 | |
| 972 | ld.q SP, FRAME_T(6), r8 | |
| 973 | ld.q SP, FRAME_T(7), r9 | |
| 974 | ptabs r6, tr4 | |
| 975 | ptabs r7, tr5 | |
| 976 | ptabs r8, tr6 | |
| 977 | ptabs r9, tr7 | |
| 978 | ||
| 979 | ld.q SP, FRAME_R(0), r0 | |
| 980 | ld.q SP, FRAME_R(1), r1 | |
| 981 | ld.q SP, FRAME_R(2), r2 | |
| 982 | ld.q SP, FRAME_R(3), r3 | |
| 983 | ld.q SP, FRAME_R(4), r4 | |
| 984 | ld.q SP, FRAME_R(5), r5 | |
| 985 | ld.q SP, FRAME_R(6), r6 | |
| 986 | ld.q SP, FRAME_R(7), r7 | |
| 987 | ld.q SP, FRAME_R(8), r8 | |
| 988 | ld.q SP, FRAME_R(9), r9 | |
| 989 | ld.q SP, FRAME_R(10), r10 | |
| 990 | ld.q SP, FRAME_R(11), r11 | |
| 991 | ld.q SP, FRAME_R(12), r12 | |
| 992 | ld.q SP, FRAME_R(13), r13 | |
| 993 | ld.q SP, FRAME_R(14), r14 | |
| 994 | ||
| 995 | ld.q SP, FRAME_R(16), r16 | |
| 996 | ld.q SP, FRAME_R(17), r17 | |
| 997 | ld.q SP, FRAME_R(18), r18 | |
| 998 | ld.q SP, FRAME_R(19), r19 | |
| 999 | ld.q SP, FRAME_R(20), r20 | |
| 1000 | ld.q SP, FRAME_R(21), r21 | |
| 1001 | ld.q SP, FRAME_R(22), r22 | |
| 1002 | ld.q SP, FRAME_R(23), r23 | |
| 1003 | ld.q SP, FRAME_R(24), r24 | |
| 1004 | ld.q SP, FRAME_R(25), r25 | |
| 1005 | ld.q SP, FRAME_R(26), r26 | |
| 1006 | ld.q SP, FRAME_R(27), r27 | |
| 1007 | ld.q SP, FRAME_R(28), r28 | |
| 1008 | ld.q SP, FRAME_R(29), r29 | |
| 1009 | ld.q SP, FRAME_R(30), r30 | |
| 1010 | ld.q SP, FRAME_R(31), r31 | |
| 1011 | ld.q SP, FRAME_R(32), r32 | |
| 1012 | ld.q SP, FRAME_R(33), r33 | |
| 1013 | ld.q SP, FRAME_R(34), r34 | |
| 1014 | ld.q SP, FRAME_R(35), r35 | |
| 1015 | ld.q SP, FRAME_R(36), r36 | |
| 1016 | ld.q SP, FRAME_R(37), r37 | |
| 1017 | ld.q SP, FRAME_R(38), r38 | |
| 1018 | ld.q SP, FRAME_R(39), r39 | |
| 1019 | ld.q SP, FRAME_R(40), r40 | |
| 1020 | ld.q SP, FRAME_R(41), r41 | |
| 1021 | ld.q SP, FRAME_R(42), r42 | |
| 1022 | ld.q SP, FRAME_R(43), r43 | |
| 1023 | ld.q SP, FRAME_R(44), r44 | |
| 1024 | ld.q SP, FRAME_R(45), r45 | |
| 1025 | ld.q SP, FRAME_R(46), r46 | |
| 1026 | ld.q SP, FRAME_R(47), r47 | |
| 1027 | ld.q SP, FRAME_R(48), r48 | |
| 1028 | ld.q SP, FRAME_R(49), r49 | |
| 1029 | ld.q SP, FRAME_R(50), r50 | |
| 1030 | ld.q SP, FRAME_R(51), r51 | |
| 1031 | ld.q SP, FRAME_R(52), r52 | |
| 1032 | ld.q SP, FRAME_R(53), r53 | |
| 1033 | ld.q SP, FRAME_R(54), r54 | |
| 1034 | ld.q SP, FRAME_R(55), r55 | |
| 1035 | ld.q SP, FRAME_R(56), r56 | |
| 1036 | ld.q SP, FRAME_R(57), r57 | |
| 1037 | ld.q SP, FRAME_R(58), r58 | |
| 1038 | ||
| 1039 | getcon SR, r59 | |
| 1040 | movi SR_BLOCK_EXC, r60 | |
| 1041 | or r59, r60, r59 | |
| 1042 | putcon r59, SR /* SR.BL = 1, keep nesting out */ | |
| 1043 | ld.q SP, FRAME_S(FSSR), r61 | |
| 1044 | ld.q SP, FRAME_S(FSPC), r62 | |
| 1045 | movi SR_ASID_MASK, r60 | |
| 1046 | and r59, r60, r59 | |
| 1047 | andc r61, r60, r61 /* Clear out older ASID */ | |
| 1048 | or r59, r61, r61 /* Retain current ASID */ | |
| 1049 | putcon r61, SSR | |
| 1050 | putcon r62, SPC | |
| 1051 | ||
| 1052 | /* Ignore FSYSCALL_ID */ | |
| 1053 | ||
| 1054 | ld.q SP, FRAME_R(59), r59 | |
| 1055 | ld.q SP, FRAME_R(60), r60 | |
| 1056 | ld.q SP, FRAME_R(61), r61 | |
| 1057 | ld.q SP, FRAME_R(62), r62 | |
| 1058 | ||
| 1059 | /* Last touch */ | |
| 1060 | ld.q SP, FRAME_R(15), SP | |
| 1061 | rte | |
| 1062 | nop | |
| 1063 | ||
| 1064 | /* | |
| 1065 | * Third level handlers for VBR-based exceptions. Adapting args to | |
| 1066 | * and/or deflecting to fourth level handlers. | |
| 1067 | * | |
| 1068 | * Fourth level handlers interface. | |
| 1069 | * Most are C-coded handlers directly pointed by the trap_jtable. | |
| 1070 | * (Third = Fourth level) | |
| 1071 | * Inputs: | |
| 1072 | * (r2) fault/interrupt code, entry number (e.g. NMI = 14, | |
| 1073 | * IRL0-3 (0000) = 16, RTLBMISS = 2, SYSCALL = 11, etc ...) | |
| 1074 | * (r3) struct pt_regs *, original register's frame pointer | |
| 1075 | * (r4) Event (0 = interrupt, 1 = TLB miss fault, 2 = Not TLB miss fault) | |
| 1076 | * (r5) TRA control register (for syscall/debug benefit only) | |
| 1077 | * (LINK) return address | |
| 1078 | * (SP) = r3 | |
| 1079 | * | |
| 1080 | * Kernel TLB fault handlers will get a slightly different interface. | |
| 1081 | * (r2) struct pt_regs *, original register's frame pointer | |
| 9a7b7739 PM |
1082 | * (r3) page fault error code (see asm/thread_info.h) |
| 1083 | * (r4) Effective Address of fault | |
| 1da177e4 LT |
1084 | * (LINK) return address |
| 1085 | * (SP) = r2 | |
| 1086 | * | |
| 1087 | * fpu_error_or_IRQ? is a helper to deflect to the right cause. | |
| 1088 | * | |
| 1089 | */ | |
| ccd80587 | 1090 | #ifdef CONFIG_MMU |
| 1da177e4 LT |
1091 | tlb_miss_load: |
| 1092 | or SP, ZERO, r2 | |
| 1093 | or ZERO, ZERO, r3 /* Read */ | |
| 9a7b7739 | 1094 | getcon TEA, r4 |
| 1da177e4 LT |
1095 | pta call_do_page_fault, tr0 |
| 1096 | beq ZERO, ZERO, tr0 | |
| 1097 | ||
| 1098 | tlb_miss_store: | |
| 1099 | or SP, ZERO, r2 | |
| 9a7b7739 PM |
1100 | movi FAULT_CODE_WRITE, r3 /* Write */ |
| 1101 | getcon TEA, r4 | |
| 1da177e4 LT |
1102 | pta call_do_page_fault, tr0 |
| 1103 | beq ZERO, ZERO, tr0 | |
| 1104 | ||
| 1105 | itlb_miss_or_IRQ: | |
| 1106 | pta its_IRQ, tr0 | |
| 1107 | beqi/u r4, EVENT_INTERRUPT, tr0 | |
| 9a7b7739 PM |
1108 | |
| 1109 | /* ITLB miss */ | |
| 1da177e4 | 1110 | or SP, ZERO, r2 |
| 9a7b7739 PM |
1111 | movi FAULT_CODE_ITLB, r3 |
| 1112 | getcon TEA, r4 | |
| 1da177e4 LT |
1113 | /* Fall through */ |
| 1114 | ||
| 1115 | call_do_page_fault: | |
| 1116 | movi do_page_fault, r6 | |
| 1117 | ptabs r6, tr0 | |
| 1118 | blink tr0, ZERO | |
| ccd80587 | 1119 | #endif /* CONFIG_MMU */ |
| 1da177e4 LT |
1120 | |
| 1121 | fpu_error_or_IRQA: | |
| 1122 | pta its_IRQ, tr0 | |
| 1123 | beqi/l r4, EVENT_INTERRUPT, tr0 | |
| 1124 | #ifdef CONFIG_SH_FPU | |
| d6db8888 | 1125 | movi fpu_state_restore_trap_handler, r6 |
| 1da177e4 LT |
1126 | #else |
| 1127 | movi do_exception_error, r6 | |
| 1128 | #endif | |
| 1129 | ptabs r6, tr0 | |
| 1130 | blink tr0, ZERO | |
| 1131 | ||
| 1132 | fpu_error_or_IRQB: | |
| 1133 | pta its_IRQ, tr0 | |
| 1134 | beqi/l r4, EVENT_INTERRUPT, tr0 | |
| 1135 | #ifdef CONFIG_SH_FPU | |
| d6db8888 | 1136 | movi fpu_state_restore_trap_handler, r6 |
| 1da177e4 LT |
1137 | #else |
| 1138 | movi do_exception_error, r6 | |
| 1139 | #endif | |
| 1140 | ptabs r6, tr0 | |
| 1141 | blink tr0, ZERO | |
| 1142 | ||
| 1143 | its_IRQ: | |
| 1144 | movi do_IRQ, r6 | |
| 1145 | ptabs r6, tr0 | |
| 1146 | blink tr0, ZERO | |
| 1147 | ||
| 1148 | /* | |
| 1149 | * system_call/unknown_trap third level handler: | |
| 1150 | * | |
| 1151 | * Inputs: | |
| 1152 | * (r2) fault/interrupt code, entry number (TRAP = 11) | |
| 1153 | * (r3) struct pt_regs *, original register's frame pointer | |
| 1154 | * (r4) Not used. Event (0=interrupt, 1=TLB miss fault, 2=Not TLB miss fault) | |
| 1155 | * (r5) TRA Control Reg (0x00xyzzzz: x=1 SYSCALL, y = #args, z=nr) | |
| 1156 | * (SP) = r3 | |
| 1157 | * (LINK) return address: ret_from_exception | |
| 1158 | * (*r3) Syscall parms: SC#, arg0, arg1, ..., arg5 in order (Saved r2/r7) | |
| 1159 | * | |
| 1160 | * Outputs: | |
| 1161 | * (*r3) Syscall reply (Saved r2) | |
| 1162 | * (LINK) In case of syscall only it can be scrapped. | |
| 1163 | * Common second level post handler will be ret_from_syscall. | |
| 1164 | * Common (non-trace) exit point to that is syscall_ret (saving | |
| 1165 | * result to r2). Common bad exit point is syscall_bad (returning | |
| 1166 | * ENOSYS then saved to r2). | |
| 1167 | * | |
| 1168 | */ | |
| 1169 | ||
| 1170 | unknown_trap: | |
| 1171 | /* Unknown Trap or User Trace */ | |
| 1172 | movi do_unknown_trapa, r6 | |
| 1173 | ptabs r6, tr0 | |
| 1174 | ld.q r3, FRAME_R(9), r2 /* r2 = #arg << 16 | syscall # */ | |
| 1175 | andi r2, 0x1ff, r2 /* r2 = syscall # */ | |
| 1176 | blink tr0, LINK | |
| 1177 | ||
| 1178 | pta syscall_ret, tr0 | |
| 1179 | blink tr0, ZERO | |
| 1180 | ||
| 1181 | /* New syscall implementation*/ | |
| 1182 | system_call: | |
| 1183 | pta unknown_trap, tr0 | |
| 1184 | or r5, ZERO, r4 /* TRA (=r5) -> r4 */ | |
| 1185 | shlri r4, 20, r4 | |
| 1186 | bnei r4, 1, tr0 /* unknown_trap if not 0x1yzzzz */ | |
| 1187 | ||
| 1188 | /* It's a system call */ | |
| 1189 | st.q r3, FRAME_S(FSYSCALL_ID), r5 /* ID (0x1yzzzz) -> stack */ | |
| 1190 | andi r5, 0x1ff, r5 /* syscall # -> r5 */ | |
| 1191 | ||
| 1192 | STI() | |
| 1193 | ||
| 1194 | pta syscall_allowed, tr0 | |
| 1195 | movi NR_syscalls - 1, r4 /* Last valid */ | |
| 1196 | bgeu/l r4, r5, tr0 | |
| 1197 | ||
| 1198 | syscall_bad: | |
| 1199 | /* Return ENOSYS ! */ | |
| 1200 | movi -(ENOSYS), r2 /* Fall-through */ | |
| 1201 | ||
| 1202 | .global syscall_ret | |
| 1203 | syscall_ret: | |
| 1204 | st.q SP, FRAME_R(9), r2 /* Expecting SP back to BASIC frame */ | |
| 1da177e4 LT |
1205 | ld.q SP, FRAME_S(FSPC), r2 |
| 1206 | addi r2, 4, r2 /* Move PC, being pre-execution event */ | |
| 1207 | st.q SP, FRAME_S(FSPC), r2 | |
| 1208 | pta ret_from_syscall, tr0 | |
| 1209 | blink tr0, ZERO | |
| 1210 | ||
| 1211 | ||
| 1212 | /* A different return path for ret_from_fork, because we now need | |
| 1213 | * to call schedule_tail with the later kernels. Because prev is | |
| 1214 | * loaded into r2 by switch_to() means we can just call it straight away | |
| 1215 | */ | |
| 1216 | ||
| 1217 | .global ret_from_fork | |
| 1218 | ret_from_fork: | |
| 1219 | ||
| 1220 | movi schedule_tail,r5 | |
| 1221 | ori r5, 1, r5 | |
| 1222 | ptabs r5, tr0 | |
| 1223 | blink tr0, LINK | |
| 1224 | ||
| 1da177e4 LT |
1225 | ld.q SP, FRAME_S(FSPC), r2 |
| 1226 | addi r2, 4, r2 /* Move PC, being pre-execution event */ | |
| 1227 | st.q SP, FRAME_S(FSPC), r2 | |
| 1228 | pta ret_from_syscall, tr0 | |
| 1229 | blink tr0, ZERO | |
| 1230 | ||
| 1da177e4 LT |
1231 | syscall_allowed: |
| 1232 | /* Use LINK to deflect the exit point, default is syscall_ret */ | |
| 1233 | pta syscall_ret, tr0 | |
| 1234 | gettr tr0, LINK | |
| 1235 | pta syscall_notrace, tr0 | |
| 1236 | ||
| 1237 | getcon KCR0, r2 | |
| 1238 | ld.l r2, TI_FLAGS, r4 | |
| cec3fd3e | 1239 | movi _TIF_WORK_SYSCALL_MASK, r6 |
| 1da177e4 LT |
1240 | and r6, r4, r6 |
| 1241 | beq/l r6, ZERO, tr0 | |
| 1242 | ||
| 1243 | /* Trace it by calling syscall_trace before and after */ | |
| ab99c733 | 1244 | movi do_syscall_trace_enter, r4 |
| 4b27c47c | 1245 | or SP, ZERO, r2 |
| 1da177e4 LT |
1246 | ptabs r4, tr0 |
| 1247 | blink tr0, LINK | |
| 4b27c47c | 1248 | |
| ab99c733 PM |
1249 | /* Save the retval */ |
| 1250 | st.q SP, FRAME_R(2), r2 | |
| 1251 | ||
| 1252 | /* Reload syscall number as r5 is trashed by do_syscall_trace_enter */ | |
| 1da177e4 LT |
1253 | ld.q SP, FRAME_S(FSYSCALL_ID), r5 |
| 1254 | andi r5, 0x1ff, r5 | |
| 1255 | ||
| 1256 | pta syscall_ret_trace, tr0 | |
| 1257 | gettr tr0, LINK | |
| 1258 | ||
| 1259 | syscall_notrace: | |
| 1260 | /* Now point to the appropriate 4th level syscall handler */ | |
| 1261 | movi sys_call_table, r4 | |
| 1262 | shlli r5, 2, r5 | |
| 1263 | ldx.l r4, r5, r5 | |
| 1264 | ptabs r5, tr0 | |
| 1265 | ||
| 1266 | /* Prepare original args */ | |
| 1267 | ld.q SP, FRAME_R(2), r2 | |
| 1268 | ld.q SP, FRAME_R(3), r3 | |
| 1269 | ld.q SP, FRAME_R(4), r4 | |
| 1270 | ld.q SP, FRAME_R(5), r5 | |
| 1271 | ld.q SP, FRAME_R(6), r6 | |
| 1272 | ld.q SP, FRAME_R(7), r7 | |
| 1273 | ||
| 1274 | /* And now the trick for those syscalls requiring regs * ! */ | |
| 1275 | or SP, ZERO, r8 | |
| 1276 | ||
| 1277 | /* Call it */ | |
| 1278 | blink tr0, ZERO /* LINK is already properly set */ | |
| 1279 | ||
| 1280 | syscall_ret_trace: | |
| 1281 | /* We get back here only if under trace */ | |
| 1282 | st.q SP, FRAME_R(9), r2 /* Save return value */ | |
| 1283 | ||
| ab99c733 | 1284 | movi do_syscall_trace_leave, LINK |
| 4b27c47c | 1285 | or SP, ZERO, r2 |
| 1da177e4 LT |
1286 | ptabs LINK, tr0 |
| 1287 | blink tr0, LINK | |
| 1288 | ||
| 1289 | /* This needs to be done after any syscall tracing */ | |
| 1290 | ld.q SP, FRAME_S(FSPC), r2 | |
| 1291 | addi r2, 4, r2 /* Move PC, being pre-execution event */ | |
| 1292 | st.q SP, FRAME_S(FSPC), r2 | |
| 1293 | ||
| 1294 | pta ret_from_syscall, tr0 | |
| 1295 | blink tr0, ZERO /* Resume normal return sequence */ | |
| 1296 | ||
| 1297 | /* | |
| 1298 | * --- Switch to running under a particular ASID and return the previous ASID value | |
| 1299 | * --- The caller is assumed to have done a cli before calling this. | |
| 1300 | * | |
| 1301 | * Input r2 : new ASID | |
| 1302 | * Output r2 : old ASID | |
| 1303 | */ | |
| 1304 | ||
| 1305 | .global switch_and_save_asid | |
| 1306 | switch_and_save_asid: | |
| 1307 | getcon sr, r0 | |
| 1308 | movi 255, r4 | |
| 1309 | shlli r4, 16, r4 /* r4 = mask to select ASID */ | |
| 1310 | and r0, r4, r3 /* r3 = shifted old ASID */ | |
| 1311 | andi r2, 255, r2 /* mask down new ASID */ | |
| 1312 | shlli r2, 16, r2 /* align new ASID against SR.ASID */ | |
| 1313 | andc r0, r4, r0 /* efface old ASID from SR */ | |
| 1314 | or r0, r2, r0 /* insert the new ASID */ | |
| 1315 | putcon r0, ssr | |
| 1316 | movi 1f, r0 | |
| 1317 | putcon r0, spc | |
| 1318 | rte | |
| 1319 | nop | |
| 1320 | 1: | |
| 1321 | ptabs LINK, tr0 | |
| 1322 | shlri r3, 16, r2 /* r2 = old ASID */ | |
| 1323 | blink tr0, r63 | |
| 1324 | ||
| 1325 | .global route_to_panic_handler | |
| 1326 | route_to_panic_handler: | |
| 1327 | /* Switch to real mode, goto panic_handler, don't return. Useful for | |
| 1328 | last-chance debugging, e.g. if no output wants to go to the console. | |
| 1329 | */ | |
| 1330 | ||
| 36763b22 | 1331 | movi panic_handler - CONFIG_PAGE_OFFSET, r1 |
| 1da177e4 LT |
1332 | ptabs r1, tr0 |
| 1333 | pta 1f, tr1 | |
| 1334 | gettr tr1, r0 | |
| 1335 | putcon r0, spc | |
| 1336 | getcon sr, r0 | |
| 1337 | movi 1, r1 | |
| 1338 | shlli r1, 31, r1 | |
| 1339 | andc r0, r1, r0 | |
| 1340 | putcon r0, ssr | |
| 1341 | rte | |
| 1342 | nop | |
| 1343 | 1: /* Now in real mode */ | |
| 1344 | blink tr0, r63 | |
| 1345 | nop | |
| 1346 | ||
| 1347 | .global peek_real_address_q | |
| 1348 | peek_real_address_q: | |
| 1349 | /* Two args: | |
| 1350 | r2 : real mode address to peek | |
| 1351 | r2(out) : result quadword | |
| 1352 | ||
| 1353 | This is provided as a cheapskate way of manipulating device | |
| 0fb849b9 PM |
1354 | registers for debugging (to avoid the need to ioremap the debug |
| 1355 | module, and to avoid the need to ioremap the watchpoint | |
| 1da177e4 LT |
1356 | controller in a way that identity maps sufficient bits to avoid the |
| 1357 | SH5-101 cut2 silicon defect). | |
| 1358 | ||
| 1359 | This code is not performance critical | |
| 1360 | */ | |
| 1361 | ||
| 1362 | add.l r2, r63, r2 /* sign extend address */ | |
| 1363 | getcon sr, r0 /* r0 = saved original SR */ | |
| 1364 | movi 1, r1 | |
| 1365 | shlli r1, 28, r1 | |
| 1366 | or r0, r1, r1 /* r0 with block bit set */ | |
| 1367 | putcon r1, sr /* now in critical section */ | |
| 1368 | movi 1, r36 | |
| 1369 | shlli r36, 31, r36 | |
| 1370 | andc r1, r36, r1 /* turn sr.mmu off in real mode section */ | |
| 1371 | ||
| 1372 | putcon r1, ssr | |
| 36763b22 | 1373 | movi .peek0 - CONFIG_PAGE_OFFSET, r36 /* real mode target address */ |
| 1da177e4 LT |
1374 | movi 1f, r37 /* virtual mode return addr */ |
| 1375 | putcon r36, spc | |
| 1376 | ||
| 1377 | synco | |
| 1378 | rte | |
| 1379 | nop | |
| 1380 | ||
| 1381 | .peek0: /* come here in real mode, don't touch caches!! | |
| 1382 | still in critical section (sr.bl==1) */ | |
| 1383 | putcon r0, ssr | |
| 1384 | putcon r37, spc | |
| 1385 | /* Here's the actual peek. If the address is bad, all bets are now off | |
| 1386 | * what will happen (handlers invoked in real-mode = bad news) */ | |
| 1387 | ld.q r2, 0, r2 | |
| 1388 | synco | |
| 1389 | rte /* Back to virtual mode */ | |
| 1390 | nop | |
| 1391 | ||
| 1392 | 1: | |
| 1393 | ptabs LINK, tr0 | |
| 1394 | blink tr0, r63 | |
| 1395 | ||
| 1396 | .global poke_real_address_q | |
| 1397 | poke_real_address_q: | |
| 1398 | /* Two args: | |
| 1399 | r2 : real mode address to poke | |
| 1400 | r3 : quadword value to write. | |
| 1401 | ||
| 1402 | This is provided as a cheapskate way of manipulating device | |
| 0fb849b9 PM |
1403 | registers for debugging (to avoid the need to ioremap the debug |
| 1404 | module, and to avoid the need to ioremap the watchpoint | |
| 1da177e4 LT |
1405 | controller in a way that identity maps sufficient bits to avoid the |
| 1406 | SH5-101 cut2 silicon defect). | |
| 1407 | ||
| 1408 | This code is not performance critical | |
| 1409 | */ | |
| 1410 | ||
| 1411 | add.l r2, r63, r2 /* sign extend address */ | |
| 1412 | getcon sr, r0 /* r0 = saved original SR */ | |
| 1413 | movi 1, r1 | |
| 1414 | shlli r1, 28, r1 | |
| 1415 | or r0, r1, r1 /* r0 with block bit set */ | |
| 1416 | putcon r1, sr /* now in critical section */ | |
| 1417 | movi 1, r36 | |
| 1418 | shlli r36, 31, r36 | |
| 1419 | andc r1, r36, r1 /* turn sr.mmu off in real mode section */ | |
| 1420 | ||
| 1421 | putcon r1, ssr | |
| 36763b22 | 1422 | movi .poke0-CONFIG_PAGE_OFFSET, r36 /* real mode target address */ |
| 1da177e4 LT |
1423 | movi 1f, r37 /* virtual mode return addr */ |
| 1424 | putcon r36, spc | |
| 1425 | ||
| 1426 | synco | |
| 1427 | rte | |
| 1428 | nop | |
| 1429 | ||
| 1430 | .poke0: /* come here in real mode, don't touch caches!! | |
| 1431 | still in critical section (sr.bl==1) */ | |
| 1432 | putcon r0, ssr | |
| 1433 | putcon r37, spc | |
| 1434 | /* Here's the actual poke. If the address is bad, all bets are now off | |
| 1435 | * what will happen (handlers invoked in real-mode = bad news) */ | |
| 1436 | st.q r2, 0, r3 | |
| 1437 | synco | |
| 1438 | rte /* Back to virtual mode */ | |
| 1439 | nop | |
| 1440 | ||
| 1441 | 1: | |
| 1442 | ptabs LINK, tr0 | |
| 1443 | blink tr0, r63 | |
| 1444 | ||
| ccd80587 | 1445 | #ifdef CONFIG_MMU |
| 1da177e4 LT |
1446 | /* |
| 1447 | * --- User Access Handling Section | |
| 1448 | */ | |
| 1449 | ||
| 1450 | /* | |
| 1451 | * User Access support. It all moved to non inlined Assembler | |
| 1452 | * functions in here. | |
| 1453 | * | |
| 1454 | * __kernel_size_t __copy_user(void *__to, const void *__from, | |
| 1455 | * __kernel_size_t __n) | |
| 1456 | * | |
| 1457 | * Inputs: | |
| 1458 | * (r2) target address | |
| 1459 | * (r3) source address | |
| 1460 | * (r4) size in bytes | |
| 1461 | * | |
| 1462 | * Ouputs: | |
| 1463 | * (*r2) target data | |
| 1464 | * (r2) non-copied bytes | |
| 1465 | * | |
| 1466 | * If a fault occurs on the user pointer, bail out early and return the | |
| 1467 | * number of bytes not copied in r2. | |
| 1468 | * Strategy : for large blocks, call a real memcpy function which can | |
| 1469 | * move >1 byte at a time using unaligned ld/st instructions, and can | |
| 1470 | * manipulate the cache using prefetch + alloco to improve the speed | |
| 1471 | * further. If a fault occurs in that function, just revert to the | |
| 1472 | * byte-by-byte approach used for small blocks; this is rare so the | |
| 1473 | * performance hit for that case does not matter. | |
| 1474 | * | |
| 1475 | * For small blocks it's not worth the overhead of setting up and calling | |
| 1476 | * the memcpy routine; do the copy a byte at a time. | |
| 1477 | * | |
| 1478 | */ | |
| 1479 | .global __copy_user | |
| 1480 | __copy_user: | |
| 1481 | pta __copy_user_byte_by_byte, tr1 | |
| 1482 | movi 16, r0 ! this value is a best guess, should tune it by benchmarking | |
| 1483 | bge/u r0, r4, tr1 | |
| 1484 | pta copy_user_memcpy, tr0 | |
| 1485 | addi SP, -32, SP | |
| 1486 | /* Save arguments in case we have to fix-up unhandled page fault */ | |
| 1487 | st.q SP, 0, r2 | |
| 1488 | st.q SP, 8, r3 | |
| 1489 | st.q SP, 16, r4 | |
| 1490 | st.q SP, 24, r35 ! r35 is callee-save | |
| 1491 | /* Save LINK in a register to reduce RTS time later (otherwise | |
| 1492 | ld SP,*,LINK;ptabs LINK;trn;blink trn,r63 becomes a critical path) */ | |
| 1493 | ori LINK, 0, r35 | |
| 1494 | blink tr0, LINK | |
| 1495 | ||
| 1496 | /* Copy completed normally if we get back here */ | |
| 1497 | ptabs r35, tr0 | |
| 1498 | ld.q SP, 24, r35 | |
| 1499 | /* don't restore r2-r4, pointless */ | |
| 1500 | /* set result=r2 to zero as the copy must have succeeded. */ | |
| 1501 | or r63, r63, r2 | |
| 1502 | addi SP, 32, SP | |
| 1503 | blink tr0, r63 ! RTS | |
| 1504 | ||
| 1505 | .global __copy_user_fixup | |
| 1506 | __copy_user_fixup: | |
| 1507 | /* Restore stack frame */ | |
| 1508 | ori r35, 0, LINK | |
| 1509 | ld.q SP, 24, r35 | |
| 1510 | ld.q SP, 16, r4 | |
| 1511 | ld.q SP, 8, r3 | |
| 1512 | ld.q SP, 0, r2 | |
| 1513 | addi SP, 32, SP | |
| 1514 | /* Fall through to original code, in the 'same' state we entered with */ | |
| 1515 | ||
| 1516 | /* The slow byte-by-byte method is used if the fast copy traps due to a bad | |
| 1517 | user address. In that rare case, the speed drop can be tolerated. */ | |
| 1518 | __copy_user_byte_by_byte: | |
| 1519 | pta ___copy_user_exit, tr1 | |
| 1520 | pta ___copy_user1, tr0 | |
| 1521 | beq/u r4, r63, tr1 /* early exit for zero length copy */ | |
| 1522 | sub r2, r3, r0 | |
| 1523 | addi r0, -1, r0 | |
| 1524 | ||
| 1525 | ___copy_user1: | |
| 1526 | ld.b r3, 0, r5 /* Fault address 1 */ | |
| 1527 | ||
| 1528 | /* Could rewrite this to use just 1 add, but the second comes 'free' | |
| 1529 | due to load latency */ | |
| 1530 | addi r3, 1, r3 | |
| 1531 | addi r4, -1, r4 /* No real fixup required */ | |
| 1532 | ___copy_user2: | |
| 1533 | stx.b r3, r0, r5 /* Fault address 2 */ | |
| 1534 | bne r4, ZERO, tr0 | |
| 1535 | ||
| 1536 | ___copy_user_exit: | |
| 1537 | or r4, ZERO, r2 | |
| 1538 | ptabs LINK, tr0 | |
| 1539 | blink tr0, ZERO | |
| 1540 | ||
| 1541 | /* | |
| 1542 | * __kernel_size_t __clear_user(void *addr, __kernel_size_t size) | |
| 1543 | * | |
| 1544 | * Inputs: | |
| 1545 | * (r2) target address | |
| 1546 | * (r3) size in bytes | |
| 1547 | * | |
| 1548 | * Ouputs: | |
| 1549 | * (*r2) zero-ed target data | |
| 1550 | * (r2) non-zero-ed bytes | |
| 1551 | */ | |
| 1552 | .global __clear_user | |
| 1553 | __clear_user: | |
| 1554 | pta ___clear_user_exit, tr1 | |
| 1555 | pta ___clear_user1, tr0 | |
| 1556 | beq/u r3, r63, tr1 | |
| 1557 | ||
| 1558 | ___clear_user1: | |
| 1559 | st.b r2, 0, ZERO /* Fault address */ | |
| 1560 | addi r2, 1, r2 | |
| 1561 | addi r3, -1, r3 /* No real fixup required */ | |
| 1562 | bne r3, ZERO, tr0 | |
| 1563 | ||
| 1564 | ___clear_user_exit: | |
| 1565 | or r3, ZERO, r2 | |
| 1566 | ptabs LINK, tr0 | |
| 1567 | blink tr0, ZERO | |
| 1568 | ||
| ccd80587 | 1569 | #endif /* CONFIG_MMU */ |
| 1da177e4 | 1570 | |
| 1da177e4 LT |
1571 | /* |
| 1572 | * extern long __get_user_asm_?(void *val, long addr) | |
| 1573 | * | |
| 1574 | * Inputs: | |
| 1575 | * (r2) dest address | |
| 1576 | * (r3) source address (in User Space) | |
| 1577 | * | |
| 1578 | * Ouputs: | |
| 1579 | * (r2) -EFAULT (faulting) | |
| 1580 | * 0 (not faulting) | |
| 1581 | */ | |
| 1582 | .global __get_user_asm_b | |
| 1583 | __get_user_asm_b: | |
| 1584 | or r2, ZERO, r4 | |
| 1585 | movi -(EFAULT), r2 /* r2 = reply, no real fixup */ | |
| 1586 | ||
| 1587 | ___get_user_asm_b1: | |
| 1588 | ld.b r3, 0, r5 /* r5 = data */ | |
| 1589 | st.b r4, 0, r5 | |
| 1590 | or ZERO, ZERO, r2 | |
| 1591 | ||
| 1592 | ___get_user_asm_b_exit: | |
| 1593 | ptabs LINK, tr0 | |
| 1594 | blink tr0, ZERO | |
| 1595 | ||
| 1596 | ||
| 1597 | .global __get_user_asm_w | |
| 1598 | __get_user_asm_w: | |
| 1599 | or r2, ZERO, r4 | |
| 1600 | movi -(EFAULT), r2 /* r2 = reply, no real fixup */ | |
| 1601 | ||
| 1602 | ___get_user_asm_w1: | |
| 1603 | ld.w r3, 0, r5 /* r5 = data */ | |
| 1604 | st.w r4, 0, r5 | |
| 1605 | or ZERO, ZERO, r2 | |
| 1606 | ||
| 1607 | ___get_user_asm_w_exit: | |
| 1608 | ptabs LINK, tr0 | |
| 1609 | blink tr0, ZERO | |
| 1610 | ||
| 1611 | ||
| 1612 | .global __get_user_asm_l | |
| 1613 | __get_user_asm_l: | |
| 1614 | or r2, ZERO, r4 | |
| 1615 | movi -(EFAULT), r2 /* r2 = reply, no real fixup */ | |
| 1616 | ||
| 1617 | ___get_user_asm_l1: | |
| 1618 | ld.l r3, 0, r5 /* r5 = data */ | |
| 1619 | st.l r4, 0, r5 | |
| 1620 | or ZERO, ZERO, r2 | |
| 1621 | ||
| 1622 | ___get_user_asm_l_exit: | |
| 1623 | ptabs LINK, tr0 | |
| 1624 | blink tr0, ZERO | |
| 1625 | ||
| 1626 | ||
| 1627 | .global __get_user_asm_q | |
| 1628 | __get_user_asm_q: | |
| 1629 | or r2, ZERO, r4 | |
| 1630 | movi -(EFAULT), r2 /* r2 = reply, no real fixup */ | |
| 1631 | ||
| 1632 | ___get_user_asm_q1: | |
| 1633 | ld.q r3, 0, r5 /* r5 = data */ | |
| 1634 | st.q r4, 0, r5 | |
| 1635 | or ZERO, ZERO, r2 | |
| 1636 | ||
| 1637 | ___get_user_asm_q_exit: | |
| 1638 | ptabs LINK, tr0 | |
| 1639 | blink tr0, ZERO | |
| 1640 | ||
| 1641 | /* | |
| 1642 | * extern long __put_user_asm_?(void *pval, long addr) | |
| 1643 | * | |
| 1644 | * Inputs: | |
| 1645 | * (r2) kernel pointer to value | |
| 1646 | * (r3) dest address (in User Space) | |
| 1647 | * | |
| 1648 | * Ouputs: | |
| 1649 | * (r2) -EFAULT (faulting) | |
| 1650 | * 0 (not faulting) | |
| 1651 | */ | |
| 1652 | .global __put_user_asm_b | |
| 1653 | __put_user_asm_b: | |
| 1654 | ld.b r2, 0, r4 /* r4 = data */ | |
| 1655 | movi -(EFAULT), r2 /* r2 = reply, no real fixup */ | |
| 1656 | ||
| 1657 | ___put_user_asm_b1: | |
| 1658 | st.b r3, 0, r4 | |
| 1659 | or ZERO, ZERO, r2 | |
| 1660 | ||
| 1661 | ___put_user_asm_b_exit: | |
| 1662 | ptabs LINK, tr0 | |
| 1663 | blink tr0, ZERO | |
| 1664 | ||
| 1665 | ||
| 1666 | .global __put_user_asm_w | |
| 1667 | __put_user_asm_w: | |
| 1668 | ld.w r2, 0, r4 /* r4 = data */ | |
| 1669 | movi -(EFAULT), r2 /* r2 = reply, no real fixup */ | |
| 1670 | ||
| 1671 | ___put_user_asm_w1: | |
| 1672 | st.w r3, 0, r4 | |
| 1673 | or ZERO, ZERO, r2 | |
| 1674 | ||
| 1675 | ___put_user_asm_w_exit: | |
| 1676 | ptabs LINK, tr0 | |
| 1677 | blink tr0, ZERO | |
| 1678 | ||
| 1679 | ||
| 1680 | .global __put_user_asm_l | |
| 1681 | __put_user_asm_l: | |
| 1682 | ld.l r2, 0, r4 /* r4 = data */ | |
| 1683 | movi -(EFAULT), r2 /* r2 = reply, no real fixup */ | |
| 1684 | ||
| 1685 | ___put_user_asm_l1: | |
| 1686 | st.l r3, 0, r4 | |
| 1687 | or ZERO, ZERO, r2 | |
| 1688 | ||
| 1689 | ___put_user_asm_l_exit: | |
| 1690 | ptabs LINK, tr0 | |
| 1691 | blink tr0, ZERO | |
| 1692 | ||
| 1693 | ||
| 1694 | .global __put_user_asm_q | |
| 1695 | __put_user_asm_q: | |
| 1696 | ld.q r2, 0, r4 /* r4 = data */ | |
| 1697 | movi -(EFAULT), r2 /* r2 = reply, no real fixup */ | |
| 1698 | ||
| 1699 | ___put_user_asm_q1: | |
| 1700 | st.q r3, 0, r4 | |
| 1701 | or ZERO, ZERO, r2 | |
| 1702 | ||
| 1703 | ___put_user_asm_q_exit: | |
| 1704 | ptabs LINK, tr0 | |
| 1705 | blink tr0, ZERO | |
| 1706 | ||
| 1707 | panic_stash_regs: | |
| 1708 | /* The idea is : when we get an unhandled panic, we dump the registers | |
| 1709 | to a known memory location, the just sit in a tight loop. | |
| 1710 | This allows the human to look at the memory region through the GDB | |
| 1711 | session (assuming the debug module's SHwy initiator isn't locked up | |
| 1712 | or anything), to hopefully analyze the cause of the panic. */ | |
| 1713 | ||
| 1714 | /* On entry, former r15 (SP) is in DCR | |
| 1715 | former r0 is at resvec_saved_area + 0 | |
| 1716 | former r1 is at resvec_saved_area + 8 | |
| 1717 | former tr0 is at resvec_saved_area + 32 | |
| 1718 | DCR is the only register whose value is lost altogether. | |
| 1719 | */ | |
| 1720 | ||
| 1721 | movi 0xffffffff80000000, r0 ! phy of dump area | |
| 1722 | ld.q SP, 0x000, r1 ! former r0 | |
| 1723 | st.q r0, 0x000, r1 | |
| 1724 | ld.q SP, 0x008, r1 ! former r1 | |
| 1725 | st.q r0, 0x008, r1 | |
| 1726 | st.q r0, 0x010, r2 | |
| 1727 | st.q r0, 0x018, r3 | |
| 1728 | st.q r0, 0x020, r4 | |
| 1729 | st.q r0, 0x028, r5 | |
| 1730 | st.q r0, 0x030, r6 | |
| 1731 | st.q r0, 0x038, r7 | |
| 1732 | st.q r0, 0x040, r8 | |
| 1733 | st.q r0, 0x048, r9 | |
| 1734 | st.q r0, 0x050, r10 | |
| 1735 | st.q r0, 0x058, r11 | |
| 1736 | st.q r0, 0x060, r12 | |
| 1737 | st.q r0, 0x068, r13 | |
| 1738 | st.q r0, 0x070, r14 | |
| 1739 | getcon dcr, r14 | |
| 1740 | st.q r0, 0x078, r14 | |
| 1741 | st.q r0, 0x080, r16 | |
| 1742 | st.q r0, 0x088, r17 | |
| 1743 | st.q r0, 0x090, r18 | |
| 1744 | st.q r0, 0x098, r19 | |
| 1745 | st.q r0, 0x0a0, r20 | |
| 1746 | st.q r0, 0x0a8, r21 | |
| 1747 | st.q r0, 0x0b0, r22 | |
| 1748 | st.q r0, 0x0b8, r23 | |
| 1749 | st.q r0, 0x0c0, r24 | |
| 1750 | st.q r0, 0x0c8, r25 | |
| 1751 | st.q r0, 0x0d0, r26 | |
| 1752 | st.q r0, 0x0d8, r27 | |
| 1753 | st.q r0, 0x0e0, r28 | |
| 1754 | st.q r0, 0x0e8, r29 | |
| 1755 | st.q r0, 0x0f0, r30 | |
| 1756 | st.q r0, 0x0f8, r31 | |
| 1757 | st.q r0, 0x100, r32 | |
| 1758 | st.q r0, 0x108, r33 | |
| 1759 | st.q r0, 0x110, r34 | |
| 1760 | st.q r0, 0x118, r35 | |
| 1761 | st.q r0, 0x120, r36 | |
| 1762 | st.q r0, 0x128, r37 | |
| 1763 | st.q r0, 0x130, r38 | |
| 1764 | st.q r0, 0x138, r39 | |
| 1765 | st.q r0, 0x140, r40 | |
| 1766 | st.q r0, 0x148, r41 | |
| 1767 | st.q r0, 0x150, r42 | |
| 1768 | st.q r0, 0x158, r43 | |
| 1769 | st.q r0, 0x160, r44 | |
| 1770 | st.q r0, 0x168, r45 | |
| 1771 | st.q r0, 0x170, r46 | |
| 1772 | st.q r0, 0x178, r47 | |
| 1773 | st.q r0, 0x180, r48 | |
| 1774 | st.q r0, 0x188, r49 | |
| 1775 | st.q r0, 0x190, r50 | |
| 1776 | st.q r0, 0x198, r51 | |
| 1777 | st.q r0, 0x1a0, r52 | |
| 1778 | st.q r0, 0x1a8, r53 | |
| 1779 | st.q r0, 0x1b0, r54 | |
| 1780 | st.q r0, 0x1b8, r55 | |
| 1781 | st.q r0, 0x1c0, r56 | |
| 1782 | st.q r0, 0x1c8, r57 | |
| 1783 | st.q r0, 0x1d0, r58 | |
| 1784 | st.q r0, 0x1d8, r59 | |
| 1785 | st.q r0, 0x1e0, r60 | |
| 1786 | st.q r0, 0x1e8, r61 | |
| 1787 | st.q r0, 0x1f0, r62 | |
| 1788 | st.q r0, 0x1f8, r63 ! bogus, but for consistency's sake... | |
| 1789 | ||
| 1790 | ld.q SP, 0x020, r1 ! former tr0 | |
| 1791 | st.q r0, 0x200, r1 | |
| 1792 | gettr tr1, r1 | |
| 1793 | st.q r0, 0x208, r1 | |
| 1794 | gettr tr2, r1 | |
| 1795 | st.q r0, 0x210, r1 | |
| 1796 | gettr tr3, r1 | |
| 1797 | st.q r0, 0x218, r1 | |
| 1798 | gettr tr4, r1 | |
| 1799 | st.q r0, 0x220, r1 | |
| 1800 | gettr tr5, r1 | |
| 1801 | st.q r0, 0x228, r1 | |
| 1802 | gettr tr6, r1 | |
| 1803 | st.q r0, 0x230, r1 | |
| 1804 | gettr tr7, r1 | |
| 1805 | st.q r0, 0x238, r1 | |
| 1806 | ||
| 1807 | getcon sr, r1 | |
| 1808 | getcon ssr, r2 | |
| 1809 | getcon pssr, r3 | |
| 1810 | getcon spc, r4 | |
| 1811 | getcon pspc, r5 | |
| 1812 | getcon intevt, r6 | |
| 1813 | getcon expevt, r7 | |
| 1814 | getcon pexpevt, r8 | |
| 1815 | getcon tra, r9 | |
| 1816 | getcon tea, r10 | |
| 1817 | getcon kcr0, r11 | |
| 1818 | getcon kcr1, r12 | |
| 1819 | getcon vbr, r13 | |
| 1820 | getcon resvec, r14 | |
| 1821 | ||
| 1822 | st.q r0, 0x240, r1 | |
| 1823 | st.q r0, 0x248, r2 | |
| 1824 | st.q r0, 0x250, r3 | |
| 1825 | st.q r0, 0x258, r4 | |
| 1826 | st.q r0, 0x260, r5 | |
| 1827 | st.q r0, 0x268, r6 | |
| 1828 | st.q r0, 0x270, r7 | |
| 1829 | st.q r0, 0x278, r8 | |
| 1830 | st.q r0, 0x280, r9 | |
| 1831 | st.q r0, 0x288, r10 | |
| 1832 | st.q r0, 0x290, r11 | |
| 1833 | st.q r0, 0x298, r12 | |
| 1834 | st.q r0, 0x2a0, r13 | |
| 1835 | st.q r0, 0x2a8, r14 | |
| 1836 | ||
| 1837 | getcon SPC,r2 | |
| 1838 | getcon SSR,r3 | |
| 1839 | getcon EXPEVT,r4 | |
| 1840 | /* Prepare to jump to C - physical address */ | |
| 36763b22 | 1841 | movi panic_handler-CONFIG_PAGE_OFFSET, r1 |
| 1da177e4 LT |
1842 | ori r1, 1, r1 |
| 1843 | ptabs r1, tr0 | |
| 1844 | getcon DCR, SP | |
| 1845 | blink tr0, ZERO | |
| 1846 | nop | |
| 1847 | nop | |
| 1848 | nop | |
| 1849 | nop | |
| 1850 | ||
| 1851 | ||
| 1852 | ||
| 1853 | ||
| 1854 | /* | |
| 1855 | * --- Signal Handling Section | |
| 1856 | */ | |
| 1857 | ||
| 1858 | /* | |
| 1859 | * extern long long _sa_default_rt_restorer | |
| 1860 | * extern long long _sa_default_restorer | |
| 1861 | * | |
| 1862 | * or, better, | |
| 1863 | * | |
| 1864 | * extern void _sa_default_rt_restorer(void) | |
| 1865 | * extern void _sa_default_restorer(void) | |
| 1866 | * | |
| 1867 | * Code prototypes to do a sys_rt_sigreturn() or sys_sysreturn() | |
| 1868 | * from user space. Copied into user space by signal management. | |
| 1869 | * Both must be quad aligned and 2 quad long (4 instructions). | |
| 1870 | * | |
| 1871 | */ | |
| 1872 | .balign 8 | |
| 1873 | .global sa_default_rt_restorer | |
| 1874 | sa_default_rt_restorer: | |
| 1875 | movi 0x10, r9 | |
| 1876 | shori __NR_rt_sigreturn, r9 | |
| 1877 | trapa r9 | |
| 1878 | nop | |
| 1879 | ||
| 1880 | .balign 8 | |
| 1881 | .global sa_default_restorer | |
| 1882 | sa_default_restorer: | |
| 1883 | movi 0x10, r9 | |
| 1884 | shori __NR_sigreturn, r9 | |
| 1885 | trapa r9 | |
| 1886 | nop | |
| 1887 | ||
| 1888 | /* | |
| 1889 | * --- __ex_table Section | |
| 1890 | */ | |
| 1891 | ||
| 1892 | /* | |
| 1893 | * User Access Exception Table. | |
| 1894 | */ | |
| 1895 | .section __ex_table, "a" | |
| 1896 | ||
| 1897 | .global asm_uaccess_start /* Just a marker */ | |
| 1898 | asm_uaccess_start: | |
| 1899 | ||
| ccd80587 | 1900 | #ifdef CONFIG_MMU |
| 1da177e4 LT |
1901 | .long ___copy_user1, ___copy_user_exit |
| 1902 | .long ___copy_user2, ___copy_user_exit | |
| 1903 | .long ___clear_user1, ___clear_user_exit | |
| ccd80587 | 1904 | #endif |
| 1da177e4 LT |
1905 | .long ___get_user_asm_b1, ___get_user_asm_b_exit |
| 1906 | .long ___get_user_asm_w1, ___get_user_asm_w_exit | |
| 1907 | .long ___get_user_asm_l1, ___get_user_asm_l_exit | |
| 1908 | .long ___get_user_asm_q1, ___get_user_asm_q_exit | |
| 1909 | .long ___put_user_asm_b1, ___put_user_asm_b_exit | |
| 1910 | .long ___put_user_asm_w1, ___put_user_asm_w_exit | |
| 1911 | .long ___put_user_asm_l1, ___put_user_asm_l_exit | |
| 1912 | .long ___put_user_asm_q1, ___put_user_asm_q_exit | |
| 1913 | ||
| 1914 | .global asm_uaccess_end /* Just a marker */ | |
| 1915 | asm_uaccess_end: | |
| 1916 | ||
| 1917 | ||
| 1918 | ||
| 1919 | ||
| 1920 | /* | |
| 882016ff | 1921 | * --- .init.text Section |
| 1da177e4 LT |
1922 | */ |
| 1923 | ||
| 882016ff | 1924 | __INIT |
| 1da177e4 LT |
1925 | |
| 1926 | /* | |
| 1927 | * void trap_init (void) | |
| 1928 | * | |
| 1929 | */ | |
| 1930 | .global trap_init | |
| 1931 | trap_init: | |
| 1932 | addi SP, -24, SP /* Room to save r28/r29/r30 */ | |
| 1933 | st.q SP, 0, r28 | |
| 1934 | st.q SP, 8, r29 | |
| 1935 | st.q SP, 16, r30 | |
| 1936 | ||
| 1937 | /* Set VBR and RESVEC */ | |
| 1938 | movi LVBR_block, r19 | |
| 1939 | andi r19, -4, r19 /* reset MMUOFF + reserved */ | |
| 1940 | /* For RESVEC exceptions we force the MMU off, which means we need the | |
| 1941 | physical address. */ | |
| 36763b22 | 1942 | movi LRESVEC_block-CONFIG_PAGE_OFFSET, r20 |
| 1da177e4 LT |
1943 | andi r20, -4, r20 /* reset reserved */ |
| 1944 | ori r20, 1, r20 /* set MMUOFF */ | |
| 1945 | putcon r19, VBR | |
| 1946 | putcon r20, RESVEC | |
| 1947 | ||
| 1948 | /* Sanity check */ | |
| 1949 | movi LVBR_block_end, r21 | |
| 1950 | andi r21, -4, r21 | |
| 1951 | movi BLOCK_SIZE, r29 /* r29 = expected size */ | |
| 1952 | or r19, ZERO, r30 | |
| 1953 | add r19, r29, r19 | |
| 1954 | ||
| 1955 | /* | |
| 1956 | * Ugly, but better loop forever now than crash afterwards. | |
| 1957 | * We should print a message, but if we touch LVBR or | |
| 1958 | * LRESVEC blocks we should not be surprised if we get stuck | |
| 1959 | * in trap_init(). | |
| 1960 | */ | |
| 1961 | pta trap_init_loop, tr1 | |
| 1962 | gettr tr1, r28 /* r28 = trap_init_loop */ | |
| 1963 | sub r21, r30, r30 /* r30 = actual size */ | |
| 1964 | ||
| 1965 | /* | |
| 1966 | * VBR/RESVEC handlers overlap by being bigger than | |
| 1967 | * allowed. Very bad. Just loop forever. | |
| 1968 | * (r28) panic/loop address | |
| 1969 | * (r29) expected size | |
| 1970 | * (r30) actual size | |
| 1971 | */ | |
| 1972 | trap_init_loop: | |
| 1973 | bne r19, r21, tr1 | |
| 1974 | ||
| 1975 | /* Now that exception vectors are set up reset SR.BL */ | |
| 1976 | getcon SR, r22 | |
| 1977 | movi SR_UNBLOCK_EXC, r23 | |
| 1978 | and r22, r23, r22 | |
| 1979 | putcon r22, SR | |
| 1980 | ||
| 1981 | addi SP, 24, SP | |
| 1982 | ptabs LINK, tr0 | |
| 1983 | blink tr0, ZERO | |
| 1984 |