1/* 2 * arch/sh/kernel/process_64.c 3 * 4 * This file handles the architecture-dependent parts of process handling.. 5 * 6 * Copyright (C) 2000, 2001 Paolo Alberelli 7 * Copyright (C) 2003 - 2007 Paul Mundt 8 * Copyright (C) 2003, 2004 Richard Curnow 9 * 10 * Started from SH3/4 version: 11 * Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima 12 * 13 * In turn started from i386 version: 14 * Copyright (C) 1995 Linus Torvalds 15 * 16 * This file is subject to the terms and conditions of the GNU General Public 17 * License. See the file "COPYING" in the main directory of this archive 18 * for more details. 19 */ 20#include <linux/mm.h> 21#include <linux/fs.h> 22#include <linux/ptrace.h> 23#include <linux/reboot.h> 24#include <linux/slab.h> 25#include <linux/init.h> 26#include <linux/module.h> 27#include <linux/io.h> 28#include <asm/syscalls.h> 29#include <asm/uaccess.h> 30#include <asm/pgtable.h> 31#include <asm/mmu_context.h> 32#include <asm/fpu.h> 33#include <asm/switch_to.h> 34 35struct task_struct *last_task_used_math = NULL; 36struct pt_regs fake_swapper_regs = { 0, }; 37 38void show_regs(struct pt_regs *regs) 39{ 40 unsigned long long ah, al, bh, bl, ch, cl; 41 42 printk("\n"); 43 show_regs_print_info(KERN_DEFAULT); 44 45 ah = (regs->pc) >> 32; 46 al = (regs->pc) & 0xffffffff; 47 bh = (regs->regs[18]) >> 32; 48 bl = (regs->regs[18]) & 0xffffffff; 49 ch = (regs->regs[15]) >> 32; 50 cl = (regs->regs[15]) & 0xffffffff; 51 printk("PC : %08Lx%08Lx LINK: %08Lx%08Lx SP : %08Lx%08Lx\n", 52 ah, al, bh, bl, ch, cl); 53 54 ah = (regs->sr) >> 32; 55 al = (regs->sr) & 0xffffffff; 56 asm volatile ("getcon " __TEA ", %0" : "=r" (bh)); 57 asm volatile ("getcon " __TEA ", %0" : "=r" (bl)); 58 bh = (bh) >> 32; 59 bl = (bl) & 0xffffffff; 60 asm volatile ("getcon " __KCR0 ", %0" : "=r" (ch)); 61 asm volatile ("getcon " __KCR0 ", %0" : "=r" (cl)); 62 ch = (ch) >> 32; 63 cl = (cl) & 0xffffffff; 64 printk("SR : %08Lx%08Lx TEA : %08Lx%08Lx KCR0: %08Lx%08Lx\n", 65 ah, al, bh, bl, ch, cl); 66 67 ah = (regs->regs[0]) >> 32; 68 al = (regs->regs[0]) & 0xffffffff; 69 bh = (regs->regs[1]) >> 32; 70 bl = (regs->regs[1]) & 0xffffffff; 71 ch = (regs->regs[2]) >> 32; 72 cl = (regs->regs[2]) & 0xffffffff; 73 printk("R0 : %08Lx%08Lx R1 : %08Lx%08Lx R2 : %08Lx%08Lx\n", 74 ah, al, bh, bl, ch, cl); 75 76 ah = (regs->regs[3]) >> 32; 77 al = (regs->regs[3]) & 0xffffffff; 78 bh = (regs->regs[4]) >> 32; 79 bl = (regs->regs[4]) & 0xffffffff; 80 ch = (regs->regs[5]) >> 32; 81 cl = (regs->regs[5]) & 0xffffffff; 82 printk("R3 : %08Lx%08Lx R4 : %08Lx%08Lx R5 : %08Lx%08Lx\n", 83 ah, al, bh, bl, ch, cl); 84 85 ah = (regs->regs[6]) >> 32; 86 al = (regs->regs[6]) & 0xffffffff; 87 bh = (regs->regs[7]) >> 32; 88 bl = (regs->regs[7]) & 0xffffffff; 89 ch = (regs->regs[8]) >> 32; 90 cl = (regs->regs[8]) & 0xffffffff; 91 printk("R6 : %08Lx%08Lx R7 : %08Lx%08Lx R8 : %08Lx%08Lx\n", 92 ah, al, bh, bl, ch, cl); 93 94 ah = (regs->regs[9]) >> 32; 95 al = (regs->regs[9]) & 0xffffffff; 96 bh = (regs->regs[10]) >> 32; 97 bl = (regs->regs[10]) & 0xffffffff; 98 ch = (regs->regs[11]) >> 32; 99 cl = (regs->regs[11]) & 0xffffffff; 100 printk("R9 : %08Lx%08Lx R10 : %08Lx%08Lx R11 : %08Lx%08Lx\n", 101 ah, al, bh, bl, ch, cl); 102 103 ah = (regs->regs[12]) >> 32; 104 al = (regs->regs[12]) & 0xffffffff; 105 bh = (regs->regs[13]) >> 32; 106 bl = (regs->regs[13]) & 0xffffffff; 107 ch = (regs->regs[14]) >> 32; 108 cl = (regs->regs[14]) & 0xffffffff; 109 printk("R12 : %08Lx%08Lx R13 : %08Lx%08Lx R14 : %08Lx%08Lx\n", 110 ah, al, bh, bl, ch, cl); 111 112 ah = (regs->regs[16]) >> 32; 113 al = (regs->regs[16]) & 0xffffffff; 114 bh = (regs->regs[17]) >> 32; 115 bl = (regs->regs[17]) & 0xffffffff; 116 ch = (regs->regs[19]) >> 32; 117 cl = (regs->regs[19]) & 0xffffffff; 118 printk("R16 : %08Lx%08Lx R17 : %08Lx%08Lx R19 : %08Lx%08Lx\n", 119 ah, al, bh, bl, ch, cl); 120 121 ah = (regs->regs[20]) >> 32; 122 al = (regs->regs[20]) & 0xffffffff; 123 bh = (regs->regs[21]) >> 32; 124 bl = (regs->regs[21]) & 0xffffffff; 125 ch = (regs->regs[22]) >> 32; 126 cl = (regs->regs[22]) & 0xffffffff; 127 printk("R20 : %08Lx%08Lx R21 : %08Lx%08Lx R22 : %08Lx%08Lx\n", 128 ah, al, bh, bl, ch, cl); 129 130 ah = (regs->regs[23]) >> 32; 131 al = (regs->regs[23]) & 0xffffffff; 132 bh = (regs->regs[24]) >> 32; 133 bl = (regs->regs[24]) & 0xffffffff; 134 ch = (regs->regs[25]) >> 32; 135 cl = (regs->regs[25]) & 0xffffffff; 136 printk("R23 : %08Lx%08Lx R24 : %08Lx%08Lx R25 : %08Lx%08Lx\n", 137 ah, al, bh, bl, ch, cl); 138 139 ah = (regs->regs[26]) >> 32; 140 al = (regs->regs[26]) & 0xffffffff; 141 bh = (regs->regs[27]) >> 32; 142 bl = (regs->regs[27]) & 0xffffffff; 143 ch = (regs->regs[28]) >> 32; 144 cl = (regs->regs[28]) & 0xffffffff; 145 printk("R26 : %08Lx%08Lx R27 : %08Lx%08Lx R28 : %08Lx%08Lx\n", 146 ah, al, bh, bl, ch, cl); 147 148 ah = (regs->regs[29]) >> 32; 149 al = (regs->regs[29]) & 0xffffffff; 150 bh = (regs->regs[30]) >> 32; 151 bl = (regs->regs[30]) & 0xffffffff; 152 ch = (regs->regs[31]) >> 32; 153 cl = (regs->regs[31]) & 0xffffffff; 154 printk("R29 : %08Lx%08Lx R30 : %08Lx%08Lx R31 : %08Lx%08Lx\n", 155 ah, al, bh, bl, ch, cl); 156 157 ah = (regs->regs[32]) >> 32; 158 al = (regs->regs[32]) & 0xffffffff; 159 bh = (regs->regs[33]) >> 32; 160 bl = (regs->regs[33]) & 0xffffffff; 161 ch = (regs->regs[34]) >> 32; 162 cl = (regs->regs[34]) & 0xffffffff; 163 printk("R32 : %08Lx%08Lx R33 : %08Lx%08Lx R34 : %08Lx%08Lx\n", 164 ah, al, bh, bl, ch, cl); 165 166 ah = (regs->regs[35]) >> 32; 167 al = (regs->regs[35]) & 0xffffffff; 168 bh = (regs->regs[36]) >> 32; 169 bl = (regs->regs[36]) & 0xffffffff; 170 ch = (regs->regs[37]) >> 32; 171 cl = (regs->regs[37]) & 0xffffffff; 172 printk("R35 : %08Lx%08Lx R36 : %08Lx%08Lx R37 : %08Lx%08Lx\n", 173 ah, al, bh, bl, ch, cl); 174 175 ah = (regs->regs[38]) >> 32; 176 al = (regs->regs[38]) & 0xffffffff; 177 bh = (regs->regs[39]) >> 32; 178 bl = (regs->regs[39]) & 0xffffffff; 179 ch = (regs->regs[40]) >> 32; 180 cl = (regs->regs[40]) & 0xffffffff; 181 printk("R38 : %08Lx%08Lx R39 : %08Lx%08Lx R40 : %08Lx%08Lx\n", 182 ah, al, bh, bl, ch, cl); 183 184 ah = (regs->regs[41]) >> 32; 185 al = (regs->regs[41]) & 0xffffffff; 186 bh = (regs->regs[42]) >> 32; 187 bl = (regs->regs[42]) & 0xffffffff; 188 ch = (regs->regs[43]) >> 32; 189 cl = (regs->regs[43]) & 0xffffffff; 190 printk("R41 : %08Lx%08Lx R42 : %08Lx%08Lx R43 : %08Lx%08Lx\n", 191 ah, al, bh, bl, ch, cl); 192 193 ah = (regs->regs[44]) >> 32; 194 al = (regs->regs[44]) & 0xffffffff; 195 bh = (regs->regs[45]) >> 32; 196 bl = (regs->regs[45]) & 0xffffffff; 197 ch = (regs->regs[46]) >> 32; 198 cl = (regs->regs[46]) & 0xffffffff; 199 printk("R44 : %08Lx%08Lx R45 : %08Lx%08Lx R46 : %08Lx%08Lx\n", 200 ah, al, bh, bl, ch, cl); 201 202 ah = (regs->regs[47]) >> 32; 203 al = (regs->regs[47]) & 0xffffffff; 204 bh = (regs->regs[48]) >> 32; 205 bl = (regs->regs[48]) & 0xffffffff; 206 ch = (regs->regs[49]) >> 32; 207 cl = (regs->regs[49]) & 0xffffffff; 208 printk("R47 : %08Lx%08Lx R48 : %08Lx%08Lx R49 : %08Lx%08Lx\n", 209 ah, al, bh, bl, ch, cl); 210 211 ah = (regs->regs[50]) >> 32; 212 al = (regs->regs[50]) & 0xffffffff; 213 bh = (regs->regs[51]) >> 32; 214 bl = (regs->regs[51]) & 0xffffffff; 215 ch = (regs->regs[52]) >> 32; 216 cl = (regs->regs[52]) & 0xffffffff; 217 printk("R50 : %08Lx%08Lx R51 : %08Lx%08Lx R52 : %08Lx%08Lx\n", 218 ah, al, bh, bl, ch, cl); 219 220 ah = (regs->regs[53]) >> 32; 221 al = (regs->regs[53]) & 0xffffffff; 222 bh = (regs->regs[54]) >> 32; 223 bl = (regs->regs[54]) & 0xffffffff; 224 ch = (regs->regs[55]) >> 32; 225 cl = (regs->regs[55]) & 0xffffffff; 226 printk("R53 : %08Lx%08Lx R54 : %08Lx%08Lx R55 : %08Lx%08Lx\n", 227 ah, al, bh, bl, ch, cl); 228 229 ah = (regs->regs[56]) >> 32; 230 al = (regs->regs[56]) & 0xffffffff; 231 bh = (regs->regs[57]) >> 32; 232 bl = (regs->regs[57]) & 0xffffffff; 233 ch = (regs->regs[58]) >> 32; 234 cl = (regs->regs[58]) & 0xffffffff; 235 printk("R56 : %08Lx%08Lx R57 : %08Lx%08Lx R58 : %08Lx%08Lx\n", 236 ah, al, bh, bl, ch, cl); 237 238 ah = (regs->regs[59]) >> 32; 239 al = (regs->regs[59]) & 0xffffffff; 240 bh = (regs->regs[60]) >> 32; 241 bl = (regs->regs[60]) & 0xffffffff; 242 ch = (regs->regs[61]) >> 32; 243 cl = (regs->regs[61]) & 0xffffffff; 244 printk("R59 : %08Lx%08Lx R60 : %08Lx%08Lx R61 : %08Lx%08Lx\n", 245 ah, al, bh, bl, ch, cl); 246 247 ah = (regs->regs[62]) >> 32; 248 al = (regs->regs[62]) & 0xffffffff; 249 bh = (regs->tregs[0]) >> 32; 250 bl = (regs->tregs[0]) & 0xffffffff; 251 ch = (regs->tregs[1]) >> 32; 252 cl = (regs->tregs[1]) & 0xffffffff; 253 printk("R62 : %08Lx%08Lx T0 : %08Lx%08Lx T1 : %08Lx%08Lx\n", 254 ah, al, bh, bl, ch, cl); 255 256 ah = (regs->tregs[2]) >> 32; 257 al = (regs->tregs[2]) & 0xffffffff; 258 bh = (regs->tregs[3]) >> 32; 259 bl = (regs->tregs[3]) & 0xffffffff; 260 ch = (regs->tregs[4]) >> 32; 261 cl = (regs->tregs[4]) & 0xffffffff; 262 printk("T2 : %08Lx%08Lx T3 : %08Lx%08Lx T4 : %08Lx%08Lx\n", 263 ah, al, bh, bl, ch, cl); 264 265 ah = (regs->tregs[5]) >> 32; 266 al = (regs->tregs[5]) & 0xffffffff; 267 bh = (regs->tregs[6]) >> 32; 268 bl = (regs->tregs[6]) & 0xffffffff; 269 ch = (regs->tregs[7]) >> 32; 270 cl = (regs->tregs[7]) & 0xffffffff; 271 printk("T5 : %08Lx%08Lx T6 : %08Lx%08Lx T7 : %08Lx%08Lx\n", 272 ah, al, bh, bl, ch, cl); 273 274 /* 275 * If we're in kernel mode, dump the stack too.. 276 */ 277 if (!user_mode(regs)) { 278 void show_stack(struct task_struct *tsk, unsigned long *sp); 279 unsigned long sp = regs->regs[15] & 0xffffffff; 280 struct task_struct *tsk = get_current(); 281 282 tsk->thread.kregs = regs; 283 284 show_stack(tsk, (unsigned long *)sp); 285 } 286} 287 288/* 289 * Free current thread data structures etc.. 290 */ 291void exit_thread(void) 292{ 293 /* 294 * See arch/sparc/kernel/process.c for the precedent for doing 295 * this -- RPC. 296 * 297 * The SH-5 FPU save/restore approach relies on 298 * last_task_used_math pointing to a live task_struct. When 299 * another task tries to use the FPU for the 1st time, the FPUDIS 300 * trap handling (see arch/sh/kernel/cpu/sh5/fpu.c) will save the 301 * existing FPU state to the FP regs field within 302 * last_task_used_math before re-loading the new task's FPU state 303 * (or initialising it if the FPU has been used before). So if 304 * last_task_used_math is stale, and its page has already been 305 * re-allocated for another use, the consequences are rather 306 * grim. Unless we null it here, there is no other path through 307 * which it would get safely nulled. 308 */ 309#ifdef CONFIG_SH_FPU 310 if (last_task_used_math == current) { 311 last_task_used_math = NULL; 312 } 313#endif 314} 315 316void flush_thread(void) 317{ 318 319 /* Called by fs/exec.c (setup_new_exec) to remove traces of a 320 * previously running executable. */ 321#ifdef CONFIG_SH_FPU 322 if (last_task_used_math == current) { 323 last_task_used_math = NULL; 324 } 325 /* Force FPU state to be reinitialised after exec */ 326 clear_used_math(); 327#endif 328 329 /* if we are a kernel thread, about to change to user thread, 330 * update kreg 331 */ 332 if(current->thread.kregs==&fake_swapper_regs) { 333 current->thread.kregs = 334 ((struct pt_regs *)(THREAD_SIZE + (unsigned long) current) - 1); 335 current->thread.uregs = current->thread.kregs; 336 } 337} 338 339void release_thread(struct task_struct *dead_task) 340{ 341 /* do nothing */ 342} 343 344/* Fill in the fpu structure for a core dump.. */ 345int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu) 346{ 347#ifdef CONFIG_SH_FPU 348 int fpvalid; 349 struct task_struct *tsk = current; 350 351 fpvalid = !!tsk_used_math(tsk); 352 if (fpvalid) { 353 if (current == last_task_used_math) { 354 enable_fpu(); 355 save_fpu(tsk); 356 disable_fpu(); 357 last_task_used_math = 0; 358 regs->sr |= SR_FD; 359 } 360 361 memcpy(fpu, &tsk->thread.xstate->hardfpu, sizeof(*fpu)); 362 } 363 364 return fpvalid; 365#else 366 return 0; /* Task didn't use the fpu at all. */ 367#endif 368} 369EXPORT_SYMBOL(dump_fpu); 370 371asmlinkage void ret_from_fork(void); 372asmlinkage void ret_from_kernel_thread(void); 373 374int copy_thread(unsigned long clone_flags, unsigned long usp, 375 unsigned long arg, struct task_struct *p) 376{ 377 struct pt_regs *childregs; 378 379#ifdef CONFIG_SH_FPU 380 /* can't happen for a kernel thread */ 381 if (last_task_used_math == current) { 382 enable_fpu(); 383 save_fpu(current); 384 disable_fpu(); 385 last_task_used_math = NULL; 386 current_pt_regs()->sr |= SR_FD; 387 } 388#endif 389 /* Copy from sh version */ 390 childregs = (struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1; 391 p->thread.sp = (unsigned long) childregs; 392 393 if (unlikely(p->flags & PF_KTHREAD)) { 394 memset(childregs, 0, sizeof(struct pt_regs)); 395 childregs->regs[2] = (unsigned long)arg; 396 childregs->regs[3] = (unsigned long)usp; 397 childregs->sr = (1 << 30); /* not user_mode */ 398 childregs->sr |= SR_FD; /* Invalidate FPU flag */ 399 p->thread.pc = (unsigned long) ret_from_kernel_thread; 400 return 0; 401 } 402 *childregs = *current_pt_regs(); 403 404 /* 405 * Sign extend the edited stack. 406 * Note that thread.pc and thread.pc will stay 407 * 32-bit wide and context switch must take care 408 * of NEFF sign extension. 409 */ 410 if (usp) 411 childregs->regs[15] = neff_sign_extend(usp); 412 p->thread.uregs = childregs; 413 414 childregs->regs[9] = 0; /* Set return value for child */ 415 childregs->sr |= SR_FD; /* Invalidate FPU flag */ 416 417 p->thread.pc = (unsigned long) ret_from_fork; 418 419 return 0; 420} 421 422#ifdef CONFIG_FRAME_POINTER 423static int in_sh64_switch_to(unsigned long pc) 424{ 425 extern char __sh64_switch_to_end; 426 /* For a sleeping task, the PC is somewhere in the middle of the function, 427 so we don't have to worry about masking the LSB off */ 428 return (pc >= (unsigned long) sh64_switch_to) && 429 (pc < (unsigned long) &__sh64_switch_to_end); 430} 431#endif 432 433unsigned long get_wchan(struct task_struct *p) 434{ 435 unsigned long pc; 436 437 if (!p || p == current || p->state == TASK_RUNNING) 438 return 0; 439 440 /* 441 * The same comment as on the Alpha applies here, too ... 442 */ 443 pc = thread_saved_pc(p); 444 445#ifdef CONFIG_FRAME_POINTER 446 if (in_sh64_switch_to(pc)) { 447 unsigned long schedule_fp; 448 unsigned long sh64_switch_to_fp; 449 unsigned long schedule_caller_pc; 450 451 sh64_switch_to_fp = (long) p->thread.sp; 452 /* r14 is saved at offset 4 in the sh64_switch_to frame */ 453 schedule_fp = *(unsigned long *) (long)(sh64_switch_to_fp + 4); 454 455 /* and the caller of 'schedule' is (currently!) saved at offset 24 456 in the frame of schedule (from disasm) */ 457 schedule_caller_pc = *(unsigned long *) (long)(schedule_fp + 24); 458 return schedule_caller_pc; 459 } 460#endif 461 return pc; 462} 463