Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1 | /* |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 2 | * Derived from "arch/i386/kernel/process.c" |
| 3 | * Copyright (C) 1995 Linus Torvalds |
| 4 | * |
| 5 | * Updated and modified by Cort Dougan (cort@cs.nmt.edu) and |
| 6 | * Paul Mackerras (paulus@cs.anu.edu.au) |
| 7 | * |
| 8 | * PowerPC version |
| 9 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or |
| 12 | * modify it under the terms of the GNU General Public License |
| 13 | * as published by the Free Software Foundation; either version |
| 14 | * 2 of the License, or (at your option) any later version. |
| 15 | */ |
| 16 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 17 | #include <linux/errno.h> |
| 18 | #include <linux/sched.h> |
| 19 | #include <linux/kernel.h> |
| 20 | #include <linux/mm.h> |
| 21 | #include <linux/smp.h> |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 22 | #include <linux/stddef.h> |
| 23 | #include <linux/unistd.h> |
| 24 | #include <linux/ptrace.h> |
| 25 | #include <linux/slab.h> |
| 26 | #include <linux/user.h> |
| 27 | #include <linux/elf.h> |
| 28 | #include <linux/init.h> |
| 29 | #include <linux/prctl.h> |
| 30 | #include <linux/init_task.h> |
| 31 | #include <linux/module.h> |
| 32 | #include <linux/kallsyms.h> |
| 33 | #include <linux/mqueue.h> |
| 34 | #include <linux/hardirq.h> |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 35 | #include <linux/utsname.h> |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 36 | |
| 37 | #include <asm/pgtable.h> |
| 38 | #include <asm/uaccess.h> |
| 39 | #include <asm/system.h> |
| 40 | #include <asm/io.h> |
| 41 | #include <asm/processor.h> |
| 42 | #include <asm/mmu.h> |
| 43 | #include <asm/prom.h> |
Michael Ellerman | 76032de | 2005-11-07 13:12:03 +1100 | [diff] [blame] | 44 | #include <asm/machdep.h> |
Paul Mackerras | c6622f6 | 2006-02-24 10:06:59 +1100 | [diff] [blame] | 45 | #include <asm/time.h> |
Arnd Bergmann | a7f3184 | 2006-03-23 00:00:08 +0100 | [diff] [blame] | 46 | #include <asm/syscalls.h> |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 47 | #ifdef CONFIG_PPC64 |
| 48 | #include <asm/firmware.h> |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 49 | #endif |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 50 | |
| 51 | extern unsigned long _get_SP(void); |
| 52 | |
| 53 | #ifndef CONFIG_SMP |
| 54 | struct task_struct *last_task_used_math = NULL; |
| 55 | struct task_struct *last_task_used_altivec = NULL; |
| 56 | struct task_struct *last_task_used_spe = NULL; |
| 57 | #endif |
| 58 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 59 | /* |
| 60 | * Make sure the floating-point register state in the |
| 61 | * the thread_struct is up to date for task tsk. |
| 62 | */ |
| 63 | void flush_fp_to_thread(struct task_struct *tsk) |
| 64 | { |
| 65 | if (tsk->thread.regs) { |
| 66 | /* |
| 67 | * We need to disable preemption here because if we didn't, |
| 68 | * another process could get scheduled after the regs->msr |
| 69 | * test but before we have finished saving the FP registers |
| 70 | * to the thread_struct. That process could take over the |
| 71 | * FPU, and then when we get scheduled again we would store |
| 72 | * bogus values for the remaining FP registers. |
| 73 | */ |
| 74 | preempt_disable(); |
| 75 | if (tsk->thread.regs->msr & MSR_FP) { |
| 76 | #ifdef CONFIG_SMP |
| 77 | /* |
| 78 | * This should only ever be called for current or |
| 79 | * for a stopped child process. Since we save away |
| 80 | * the FP register state on context switch on SMP, |
| 81 | * there is something wrong if a stopped child appears |
| 82 | * to still have its FP state in the CPU registers. |
| 83 | */ |
| 84 | BUG_ON(tsk != current); |
| 85 | #endif |
Kumar Gala | 0ee6c15 | 2007-08-28 21:15:53 -0500 | [diff] [blame] | 86 | giveup_fpu(tsk); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 87 | } |
| 88 | preempt_enable(); |
| 89 | } |
| 90 | } |
| 91 | |
| 92 | void enable_kernel_fp(void) |
| 93 | { |
| 94 | WARN_ON(preemptible()); |
| 95 | |
| 96 | #ifdef CONFIG_SMP |
| 97 | if (current->thread.regs && (current->thread.regs->msr & MSR_FP)) |
| 98 | giveup_fpu(current); |
| 99 | else |
| 100 | giveup_fpu(NULL); /* just enables FP for kernel */ |
| 101 | #else |
| 102 | giveup_fpu(last_task_used_math); |
| 103 | #endif /* CONFIG_SMP */ |
| 104 | } |
| 105 | EXPORT_SYMBOL(enable_kernel_fp); |
| 106 | |
| 107 | int dump_task_fpu(struct task_struct *tsk, elf_fpregset_t *fpregs) |
| 108 | { |
| 109 | if (!tsk->thread.regs) |
| 110 | return 0; |
| 111 | flush_fp_to_thread(current); |
| 112 | |
| 113 | memcpy(fpregs, &tsk->thread.fpr[0], sizeof(*fpregs)); |
| 114 | |
| 115 | return 1; |
| 116 | } |
| 117 | |
| 118 | #ifdef CONFIG_ALTIVEC |
| 119 | void enable_kernel_altivec(void) |
| 120 | { |
| 121 | WARN_ON(preemptible()); |
| 122 | |
| 123 | #ifdef CONFIG_SMP |
| 124 | if (current->thread.regs && (current->thread.regs->msr & MSR_VEC)) |
| 125 | giveup_altivec(current); |
| 126 | else |
| 127 | giveup_altivec(NULL); /* just enable AltiVec for kernel - force */ |
| 128 | #else |
| 129 | giveup_altivec(last_task_used_altivec); |
| 130 | #endif /* CONFIG_SMP */ |
| 131 | } |
| 132 | EXPORT_SYMBOL(enable_kernel_altivec); |
| 133 | |
| 134 | /* |
| 135 | * Make sure the VMX/Altivec register state in the |
| 136 | * the thread_struct is up to date for task tsk. |
| 137 | */ |
| 138 | void flush_altivec_to_thread(struct task_struct *tsk) |
| 139 | { |
| 140 | if (tsk->thread.regs) { |
| 141 | preempt_disable(); |
| 142 | if (tsk->thread.regs->msr & MSR_VEC) { |
| 143 | #ifdef CONFIG_SMP |
| 144 | BUG_ON(tsk != current); |
| 145 | #endif |
Kumar Gala | 0ee6c15 | 2007-08-28 21:15:53 -0500 | [diff] [blame] | 146 | giveup_altivec(tsk); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 147 | } |
| 148 | preempt_enable(); |
| 149 | } |
| 150 | } |
| 151 | |
Mark Nelson | 1f7d666 | 2007-10-16 23:25:40 -0700 | [diff] [blame] | 152 | int dump_task_altivec(struct task_struct *tsk, elf_vrregset_t *vrregs) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 153 | { |
Mark Nelson | 1f7d666 | 2007-10-16 23:25:40 -0700 | [diff] [blame] | 154 | /* ELF_NVRREG includes the VSCR and VRSAVE which we need to save |
| 155 | * separately, see below */ |
| 156 | const int nregs = ELF_NVRREG - 2; |
| 157 | elf_vrreg_t *reg; |
| 158 | u32 *dest; |
| 159 | |
| 160 | if (tsk == current) |
| 161 | flush_altivec_to_thread(tsk); |
| 162 | |
| 163 | reg = (elf_vrreg_t *)vrregs; |
| 164 | |
| 165 | /* copy the 32 vr registers */ |
| 166 | memcpy(reg, &tsk->thread.vr[0], nregs * sizeof(*reg)); |
| 167 | reg += nregs; |
| 168 | |
| 169 | /* copy the vscr */ |
| 170 | memcpy(reg, &tsk->thread.vscr, sizeof(*reg)); |
| 171 | reg++; |
| 172 | |
| 173 | /* vrsave is stored in the high 32bit slot of the final 128bits */ |
| 174 | memset(reg, 0, sizeof(*reg)); |
| 175 | dest = (u32 *)reg; |
| 176 | *dest = tsk->thread.vrsave; |
| 177 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 178 | return 1; |
| 179 | } |
| 180 | #endif /* CONFIG_ALTIVEC */ |
| 181 | |
| 182 | #ifdef CONFIG_SPE |
| 183 | |
| 184 | void enable_kernel_spe(void) |
| 185 | { |
| 186 | WARN_ON(preemptible()); |
| 187 | |
| 188 | #ifdef CONFIG_SMP |
| 189 | if (current->thread.regs && (current->thread.regs->msr & MSR_SPE)) |
| 190 | giveup_spe(current); |
| 191 | else |
| 192 | giveup_spe(NULL); /* just enable SPE for kernel - force */ |
| 193 | #else |
| 194 | giveup_spe(last_task_used_spe); |
| 195 | #endif /* __SMP __ */ |
| 196 | } |
| 197 | EXPORT_SYMBOL(enable_kernel_spe); |
| 198 | |
| 199 | void flush_spe_to_thread(struct task_struct *tsk) |
| 200 | { |
| 201 | if (tsk->thread.regs) { |
| 202 | preempt_disable(); |
| 203 | if (tsk->thread.regs->msr & MSR_SPE) { |
| 204 | #ifdef CONFIG_SMP |
| 205 | BUG_ON(tsk != current); |
| 206 | #endif |
Kumar Gala | 0ee6c15 | 2007-08-28 21:15:53 -0500 | [diff] [blame] | 207 | giveup_spe(tsk); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 208 | } |
| 209 | preempt_enable(); |
| 210 | } |
| 211 | } |
| 212 | |
| 213 | int dump_spe(struct pt_regs *regs, elf_vrregset_t *evrregs) |
| 214 | { |
| 215 | flush_spe_to_thread(current); |
| 216 | /* We copy u32 evr[32] + u64 acc + u32 spefscr -> 35 */ |
| 217 | memcpy(evrregs, ¤t->thread.evr[0], sizeof(u32) * 35); |
| 218 | return 1; |
| 219 | } |
| 220 | #endif /* CONFIG_SPE */ |
| 221 | |
Paul Mackerras | 5388fb1 | 2006-01-11 22:11:39 +1100 | [diff] [blame] | 222 | #ifndef CONFIG_SMP |
Paul Mackerras | 48abec0 | 2005-11-30 13:20:54 +1100 | [diff] [blame] | 223 | /* |
| 224 | * If we are doing lazy switching of CPU state (FP, altivec or SPE), |
| 225 | * and the current task has some state, discard it. |
| 226 | */ |
Paul Mackerras | 5388fb1 | 2006-01-11 22:11:39 +1100 | [diff] [blame] | 227 | void discard_lazy_cpu_state(void) |
Paul Mackerras | 48abec0 | 2005-11-30 13:20:54 +1100 | [diff] [blame] | 228 | { |
Paul Mackerras | 48abec0 | 2005-11-30 13:20:54 +1100 | [diff] [blame] | 229 | preempt_disable(); |
| 230 | if (last_task_used_math == current) |
| 231 | last_task_used_math = NULL; |
| 232 | #ifdef CONFIG_ALTIVEC |
| 233 | if (last_task_used_altivec == current) |
| 234 | last_task_used_altivec = NULL; |
| 235 | #endif /* CONFIG_ALTIVEC */ |
| 236 | #ifdef CONFIG_SPE |
| 237 | if (last_task_used_spe == current) |
| 238 | last_task_used_spe = NULL; |
| 239 | #endif |
| 240 | preempt_enable(); |
Paul Mackerras | 48abec0 | 2005-11-30 13:20:54 +1100 | [diff] [blame] | 241 | } |
Paul Mackerras | 5388fb1 | 2006-01-11 22:11:39 +1100 | [diff] [blame] | 242 | #endif /* CONFIG_SMP */ |
Paul Mackerras | 48abec0 | 2005-11-30 13:20:54 +1100 | [diff] [blame] | 243 | |
Michael Ellerman | a2ceff5 | 2008-03-28 19:11:48 +1100 | [diff] [blame] | 244 | static DEFINE_PER_CPU(unsigned long, current_dabr); |
| 245 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 246 | int set_dabr(unsigned long dabr) |
| 247 | { |
Michael Ellerman | a2ceff5 | 2008-03-28 19:11:48 +1100 | [diff] [blame] | 248 | __get_cpu_var(current_dabr) = dabr; |
| 249 | |
Benjamin Herrenschmidt | 791cc50 | 2007-06-04 15:15:48 +1000 | [diff] [blame] | 250 | #ifdef CONFIG_PPC_MERGE /* XXX for now */ |
Michael Ellerman | cab0af9 | 2005-11-03 15:30:49 +1100 | [diff] [blame] | 251 | if (ppc_md.set_dabr) |
| 252 | return ppc_md.set_dabr(dabr); |
Benjamin Herrenschmidt | 791cc50 | 2007-06-04 15:15:48 +1000 | [diff] [blame] | 253 | #endif |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 254 | |
Benjamin Herrenschmidt | 791cc50 | 2007-06-04 15:15:48 +1000 | [diff] [blame] | 255 | /* XXX should we have a CPU_FTR_HAS_DABR ? */ |
| 256 | #if defined(CONFIG_PPC64) || defined(CONFIG_6xx) |
Michael Ellerman | cab0af9 | 2005-11-03 15:30:49 +1100 | [diff] [blame] | 257 | mtspr(SPRN_DABR, dabr); |
Benjamin Herrenschmidt | 791cc50 | 2007-06-04 15:15:48 +1000 | [diff] [blame] | 258 | #endif |
Michael Ellerman | cab0af9 | 2005-11-03 15:30:49 +1100 | [diff] [blame] | 259 | return 0; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 260 | } |
| 261 | |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 262 | #ifdef CONFIG_PPC64 |
| 263 | DEFINE_PER_CPU(struct cpu_usage, cpu_usage_array); |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 264 | #endif |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 265 | |
| 266 | struct task_struct *__switch_to(struct task_struct *prev, |
| 267 | struct task_struct *new) |
| 268 | { |
| 269 | struct thread_struct *new_thread, *old_thread; |
| 270 | unsigned long flags; |
| 271 | struct task_struct *last; |
| 272 | |
| 273 | #ifdef CONFIG_SMP |
| 274 | /* avoid complexity of lazy save/restore of fpu |
| 275 | * by just saving it every time we switch out if |
| 276 | * this task used the fpu during the last quantum. |
| 277 | * |
| 278 | * If it tries to use the fpu again, it'll trap and |
| 279 | * reload its fp regs. So we don't have to do a restore |
| 280 | * every switch, just a save. |
| 281 | * -- Cort |
| 282 | */ |
| 283 | if (prev->thread.regs && (prev->thread.regs->msr & MSR_FP)) |
| 284 | giveup_fpu(prev); |
| 285 | #ifdef CONFIG_ALTIVEC |
| 286 | /* |
| 287 | * If the previous thread used altivec in the last quantum |
| 288 | * (thus changing altivec regs) then save them. |
| 289 | * We used to check the VRSAVE register but not all apps |
| 290 | * set it, so we don't rely on it now (and in fact we need |
| 291 | * to save & restore VSCR even if VRSAVE == 0). -- paulus |
| 292 | * |
| 293 | * On SMP we always save/restore altivec regs just to avoid the |
| 294 | * complexity of changing processors. |
| 295 | * -- Cort |
| 296 | */ |
| 297 | if (prev->thread.regs && (prev->thread.regs->msr & MSR_VEC)) |
| 298 | giveup_altivec(prev); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 299 | #endif /* CONFIG_ALTIVEC */ |
| 300 | #ifdef CONFIG_SPE |
| 301 | /* |
| 302 | * If the previous thread used spe in the last quantum |
| 303 | * (thus changing spe regs) then save them. |
| 304 | * |
| 305 | * On SMP we always save/restore spe regs just to avoid the |
| 306 | * complexity of changing processors. |
| 307 | */ |
| 308 | if ((prev->thread.regs && (prev->thread.regs->msr & MSR_SPE))) |
| 309 | giveup_spe(prev); |
Paul Mackerras | c0c0d99 | 2005-10-01 13:49:08 +1000 | [diff] [blame] | 310 | #endif /* CONFIG_SPE */ |
| 311 | |
| 312 | #else /* CONFIG_SMP */ |
| 313 | #ifdef CONFIG_ALTIVEC |
| 314 | /* Avoid the trap. On smp this this never happens since |
| 315 | * we don't set last_task_used_altivec -- Cort |
| 316 | */ |
| 317 | if (new->thread.regs && last_task_used_altivec == new) |
| 318 | new->thread.regs->msr |= MSR_VEC; |
| 319 | #endif /* CONFIG_ALTIVEC */ |
| 320 | #ifdef CONFIG_SPE |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 321 | /* Avoid the trap. On smp this this never happens since |
| 322 | * we don't set last_task_used_spe |
| 323 | */ |
| 324 | if (new->thread.regs && last_task_used_spe == new) |
| 325 | new->thread.regs->msr |= MSR_SPE; |
| 326 | #endif /* CONFIG_SPE */ |
Paul Mackerras | c0c0d99 | 2005-10-01 13:49:08 +1000 | [diff] [blame] | 327 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 328 | #endif /* CONFIG_SMP */ |
| 329 | |
Michael Ellerman | a2ceff5 | 2008-03-28 19:11:48 +1100 | [diff] [blame] | 330 | if (unlikely(__get_cpu_var(current_dabr) != new->thread.dabr)) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 331 | set_dabr(new->thread.dabr); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 332 | |
| 333 | new_thread = &new->thread; |
| 334 | old_thread = ¤t->thread; |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 335 | |
| 336 | #ifdef CONFIG_PPC64 |
| 337 | /* |
| 338 | * Collect processor utilization data per process |
| 339 | */ |
| 340 | if (firmware_has_feature(FW_FEATURE_SPLPAR)) { |
| 341 | struct cpu_usage *cu = &__get_cpu_var(cpu_usage_array); |
| 342 | long unsigned start_tb, current_tb; |
| 343 | start_tb = old_thread->start_tb; |
| 344 | cu->current_tb = current_tb = mfspr(SPRN_PURR); |
| 345 | old_thread->accum_tb += (current_tb - start_tb); |
| 346 | new_thread->start_tb = current_tb; |
| 347 | } |
| 348 | #endif |
| 349 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 350 | local_irq_save(flags); |
Paul Mackerras | c6622f6 | 2006-02-24 10:06:59 +1100 | [diff] [blame] | 351 | |
| 352 | account_system_vtime(current); |
Tony Breeds | 81a3843 | 2007-12-04 16:51:44 +1100 | [diff] [blame] | 353 | account_process_vtime(current); |
Paul Mackerras | c6622f6 | 2006-02-24 10:06:59 +1100 | [diff] [blame] | 354 | calculate_steal_time(); |
| 355 | |
Anton Blanchard | 44387e9 | 2008-03-17 15:27:09 +1100 | [diff] [blame] | 356 | /* |
| 357 | * We can't take a PMU exception inside _switch() since there is a |
| 358 | * window where the kernel stack SLB and the kernel stack are out |
| 359 | * of sync. Hard disable here. |
| 360 | */ |
| 361 | hard_irq_disable(); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 362 | last = _switch(old_thread, new_thread); |
| 363 | |
| 364 | local_irq_restore(flags); |
| 365 | |
| 366 | return last; |
| 367 | } |
| 368 | |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 369 | static int instructions_to_print = 16; |
| 370 | |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 371 | static void show_instructions(struct pt_regs *regs) |
| 372 | { |
| 373 | int i; |
| 374 | unsigned long pc = regs->nip - (instructions_to_print * 3 / 4 * |
| 375 | sizeof(int)); |
| 376 | |
| 377 | printk("Instruction dump:"); |
| 378 | |
| 379 | for (i = 0; i < instructions_to_print; i++) { |
| 380 | int instr; |
| 381 | |
| 382 | if (!(i % 8)) |
| 383 | printk("\n"); |
| 384 | |
Scott Wood | 0de2d82 | 2007-09-28 04:38:55 +1000 | [diff] [blame] | 385 | #if !defined(CONFIG_BOOKE) |
| 386 | /* If executing with the IMMU off, adjust pc rather |
| 387 | * than print XXXXXXXX. |
| 388 | */ |
| 389 | if (!(regs->msr & MSR_IR)) |
| 390 | pc = (unsigned long)phys_to_virt(pc); |
| 391 | #endif |
| 392 | |
Stephen Rothwell | af30837 | 2006-03-23 17:38:10 +1100 | [diff] [blame] | 393 | /* We use __get_user here *only* to avoid an OOPS on a |
| 394 | * bad address because the pc *should* only be a |
| 395 | * kernel address. |
| 396 | */ |
Anton Blanchard | 00ae36d | 2006-10-13 12:17:16 +1000 | [diff] [blame] | 397 | if (!__kernel_text_address(pc) || |
| 398 | __get_user(instr, (unsigned int __user *)pc)) { |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 399 | printk("XXXXXXXX "); |
| 400 | } else { |
| 401 | if (regs->nip == pc) |
| 402 | printk("<%08x> ", instr); |
| 403 | else |
| 404 | printk("%08x ", instr); |
| 405 | } |
| 406 | |
| 407 | pc += sizeof(int); |
| 408 | } |
| 409 | |
| 410 | printk("\n"); |
| 411 | } |
| 412 | |
| 413 | static struct regbit { |
| 414 | unsigned long bit; |
| 415 | const char *name; |
| 416 | } msr_bits[] = { |
| 417 | {MSR_EE, "EE"}, |
| 418 | {MSR_PR, "PR"}, |
| 419 | {MSR_FP, "FP"}, |
| 420 | {MSR_ME, "ME"}, |
| 421 | {MSR_IR, "IR"}, |
| 422 | {MSR_DR, "DR"}, |
| 423 | {0, NULL} |
| 424 | }; |
| 425 | |
| 426 | static void printbits(unsigned long val, struct regbit *bits) |
| 427 | { |
| 428 | const char *sep = ""; |
| 429 | |
| 430 | printk("<"); |
| 431 | for (; bits->bit; ++bits) |
| 432 | if (val & bits->bit) { |
| 433 | printk("%s%s", sep, bits->name); |
| 434 | sep = ","; |
| 435 | } |
| 436 | printk(">"); |
| 437 | } |
| 438 | |
| 439 | #ifdef CONFIG_PPC64 |
anton@samba.org | f6f7dde | 2007-03-20 20:38:19 -0500 | [diff] [blame] | 440 | #define REG "%016lx" |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 441 | #define REGS_PER_LINE 4 |
| 442 | #define LAST_VOLATILE 13 |
| 443 | #else |
anton@samba.org | f6f7dde | 2007-03-20 20:38:19 -0500 | [diff] [blame] | 444 | #define REG "%08lx" |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 445 | #define REGS_PER_LINE 8 |
| 446 | #define LAST_VOLATILE 12 |
| 447 | #endif |
| 448 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 449 | void show_regs(struct pt_regs * regs) |
| 450 | { |
| 451 | int i, trap; |
| 452 | |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 453 | printk("NIP: "REG" LR: "REG" CTR: "REG"\n", |
| 454 | regs->nip, regs->link, regs->ctr); |
| 455 | printk("REGS: %p TRAP: %04lx %s (%s)\n", |
Serge E. Hallyn | 96b644b | 2006-10-02 02:18:13 -0700 | [diff] [blame] | 456 | regs, regs->trap, print_tainted(), init_utsname()->release); |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 457 | printk("MSR: "REG" ", regs->msr); |
| 458 | printbits(regs->msr, msr_bits); |
anton@samba.org | f6f7dde | 2007-03-20 20:38:19 -0500 | [diff] [blame] | 459 | printk(" CR: %08lx XER: %08lx\n", regs->ccr, regs->xer); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 460 | trap = TRAP(regs); |
| 461 | if (trap == 0x300 || trap == 0x600) |
Kumar Gala | 1417078 | 2007-07-26 00:46:15 -0500 | [diff] [blame] | 462 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) |
| 463 | printk("DEAR: "REG", ESR: "REG"\n", regs->dar, regs->dsisr); |
| 464 | #else |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 465 | printk("DAR: "REG", DSISR: "REG"\n", regs->dar, regs->dsisr); |
Kumar Gala | 1417078 | 2007-07-26 00:46:15 -0500 | [diff] [blame] | 466 | #endif |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 467 | printk("TASK = %p[%d] '%s' THREAD: %p", |
Alexey Dobriyan | 19c5870 | 2007-10-18 23:40:41 -0700 | [diff] [blame] | 468 | current, task_pid_nr(current), current->comm, task_thread_info(current)); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 469 | |
| 470 | #ifdef CONFIG_SMP |
Hugh Dickins | 79ccd1b | 2008-02-09 05:25:13 +1100 | [diff] [blame] | 471 | printk(" CPU: %d", raw_smp_processor_id()); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 472 | #endif /* CONFIG_SMP */ |
| 473 | |
| 474 | for (i = 0; i < 32; i++) { |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 475 | if ((i % REGS_PER_LINE) == 0) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 476 | printk("\n" KERN_INFO "GPR%02d: ", i); |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 477 | printk(REG " ", regs->gpr[i]); |
| 478 | if (i == LAST_VOLATILE && !FULL_REGS(regs)) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 479 | break; |
| 480 | } |
| 481 | printk("\n"); |
| 482 | #ifdef CONFIG_KALLSYMS |
| 483 | /* |
| 484 | * Lookup NIP late so we have the best change of getting the |
| 485 | * above info out without failing |
| 486 | */ |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 487 | printk("NIP ["REG"] ", regs->nip); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 488 | print_symbol("%s\n", regs->nip); |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 489 | printk("LR ["REG"] ", regs->link); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 490 | print_symbol("%s\n", regs->link); |
| 491 | #endif |
| 492 | show_stack(current, (unsigned long *) regs->gpr[1]); |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 493 | if (!user_mode(regs)) |
| 494 | show_instructions(regs); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 495 | } |
| 496 | |
| 497 | void exit_thread(void) |
| 498 | { |
Paul Mackerras | 48abec0 | 2005-11-30 13:20:54 +1100 | [diff] [blame] | 499 | discard_lazy_cpu_state(); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 500 | } |
| 501 | |
| 502 | void flush_thread(void) |
| 503 | { |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 504 | #ifdef CONFIG_PPC64 |
| 505 | struct thread_info *t = current_thread_info(); |
| 506 | |
Mathieu Desnoyers | f144e7c7 | 2007-03-10 03:23:03 -0500 | [diff] [blame] | 507 | if (test_ti_thread_flag(t, TIF_ABI_PENDING)) { |
| 508 | clear_ti_thread_flag(t, TIF_ABI_PENDING); |
| 509 | if (test_ti_thread_flag(t, TIF_32BIT)) |
| 510 | clear_ti_thread_flag(t, TIF_32BIT); |
| 511 | else |
| 512 | set_ti_thread_flag(t, TIF_32BIT); |
| 513 | } |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 514 | #endif |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 515 | |
Paul Mackerras | 48abec0 | 2005-11-30 13:20:54 +1100 | [diff] [blame] | 516 | discard_lazy_cpu_state(); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 517 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 518 | if (current->thread.dabr) { |
| 519 | current->thread.dabr = 0; |
| 520 | set_dabr(0); |
| 521 | } |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 522 | } |
| 523 | |
| 524 | void |
| 525 | release_thread(struct task_struct *t) |
| 526 | { |
| 527 | } |
| 528 | |
| 529 | /* |
| 530 | * This gets called before we allocate a new thread and copy |
| 531 | * the current task into it. |
| 532 | */ |
| 533 | void prepare_to_copy(struct task_struct *tsk) |
| 534 | { |
| 535 | flush_fp_to_thread(current); |
| 536 | flush_altivec_to_thread(current); |
| 537 | flush_spe_to_thread(current); |
| 538 | } |
| 539 | |
| 540 | /* |
| 541 | * Copy a thread.. |
| 542 | */ |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 543 | int copy_thread(int nr, unsigned long clone_flags, unsigned long usp, |
| 544 | unsigned long unused, struct task_struct *p, |
| 545 | struct pt_regs *regs) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 546 | { |
| 547 | struct pt_regs *childregs, *kregs; |
| 548 | extern void ret_from_fork(void); |
Al Viro | 0cec6fd | 2006-01-12 01:06:02 -0800 | [diff] [blame] | 549 | unsigned long sp = (unsigned long)task_stack_page(p) + THREAD_SIZE; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 550 | |
| 551 | CHECK_FULL_REGS(regs); |
| 552 | /* Copy registers */ |
| 553 | sp -= sizeof(struct pt_regs); |
| 554 | childregs = (struct pt_regs *) sp; |
| 555 | *childregs = *regs; |
| 556 | if ((childregs->msr & MSR_PR) == 0) { |
| 557 | /* for kernel thread, set `current' and stackptr in new task */ |
| 558 | childregs->gpr[1] = sp + sizeof(struct pt_regs); |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 559 | #ifdef CONFIG_PPC32 |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 560 | childregs->gpr[2] = (unsigned long) p; |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 561 | #else |
Al Viro | b5e2fc1 | 2006-01-12 01:06:01 -0800 | [diff] [blame] | 562 | clear_tsk_thread_flag(p, TIF_32BIT); |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 563 | #endif |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 564 | p->thread.regs = NULL; /* no user register state */ |
| 565 | } else { |
| 566 | childregs->gpr[1] = usp; |
| 567 | p->thread.regs = childregs; |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 568 | if (clone_flags & CLONE_SETTLS) { |
| 569 | #ifdef CONFIG_PPC64 |
| 570 | if (!test_thread_flag(TIF_32BIT)) |
| 571 | childregs->gpr[13] = childregs->gpr[6]; |
| 572 | else |
| 573 | #endif |
| 574 | childregs->gpr[2] = childregs->gpr[6]; |
| 575 | } |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 576 | } |
| 577 | childregs->gpr[3] = 0; /* Result from fork() */ |
| 578 | sp -= STACK_FRAME_OVERHEAD; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 579 | |
| 580 | /* |
| 581 | * The way this works is that at some point in the future |
| 582 | * some task will call _switch to switch to the new task. |
| 583 | * That will pop off the stack frame created below and start |
| 584 | * the new task running at ret_from_fork. The new task will |
| 585 | * do some house keeping and then return from the fork or clone |
| 586 | * system call, using the stack frame created above. |
| 587 | */ |
| 588 | sp -= sizeof(struct pt_regs); |
| 589 | kregs = (struct pt_regs *) sp; |
| 590 | sp -= STACK_FRAME_OVERHEAD; |
| 591 | p->thread.ksp = sp; |
Kumar Gala | 8521882 | 2008-04-28 16:21:22 +1000 | [diff] [blame] | 592 | p->thread.ksp_limit = (unsigned long)task_stack_page(p) + |
| 593 | _ALIGN_UP(sizeof(struct thread_info), 16); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 594 | |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 595 | #ifdef CONFIG_PPC64 |
| 596 | if (cpu_has_feature(CPU_FTR_SLB)) { |
Paul Mackerras | 1189be6 | 2007-10-11 20:37:10 +1000 | [diff] [blame] | 597 | unsigned long sp_vsid; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 598 | unsigned long llp = mmu_psize_defs[mmu_linear_psize].sllp; |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 599 | |
Paul Mackerras | 1189be6 | 2007-10-11 20:37:10 +1000 | [diff] [blame] | 600 | if (cpu_has_feature(CPU_FTR_1T_SEGMENT)) |
| 601 | sp_vsid = get_kernel_vsid(sp, MMU_SEGSIZE_1T) |
| 602 | << SLB_VSID_SHIFT_1T; |
| 603 | else |
| 604 | sp_vsid = get_kernel_vsid(sp, MMU_SEGSIZE_256M) |
| 605 | << SLB_VSID_SHIFT; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 606 | sp_vsid |= SLB_VSID_KERNEL | llp; |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 607 | p->thread.ksp_vsid = sp_vsid; |
| 608 | } |
| 609 | |
| 610 | /* |
| 611 | * The PPC64 ABI makes use of a TOC to contain function |
| 612 | * pointers. The function (ret_from_except) is actually a pointer |
| 613 | * to the TOC entry. The first entry is a pointer to the actual |
| 614 | * function. |
| 615 | */ |
| 616 | kregs->nip = *((unsigned long *)ret_from_fork); |
| 617 | #else |
| 618 | kregs->nip = (unsigned long)ret_from_fork; |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 619 | #endif |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 620 | |
| 621 | return 0; |
| 622 | } |
| 623 | |
| 624 | /* |
| 625 | * Set up a thread for executing a new program |
| 626 | */ |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 627 | void start_thread(struct pt_regs *regs, unsigned long start, unsigned long sp) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 628 | { |
Michael Ellerman | 90eac72 | 2005-10-21 16:01:33 +1000 | [diff] [blame] | 629 | #ifdef CONFIG_PPC64 |
| 630 | unsigned long load_addr = regs->gpr[2]; /* saved by ELF_PLAT_INIT */ |
| 631 | #endif |
| 632 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 633 | set_fs(USER_DS); |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 634 | |
| 635 | /* |
| 636 | * If we exec out of a kernel thread then thread.regs will not be |
| 637 | * set. Do it now. |
| 638 | */ |
| 639 | if (!current->thread.regs) { |
Al Viro | 0cec6fd | 2006-01-12 01:06:02 -0800 | [diff] [blame] | 640 | struct pt_regs *regs = task_stack_page(current) + THREAD_SIZE; |
| 641 | current->thread.regs = regs - 1; |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 642 | } |
| 643 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 644 | memset(regs->gpr, 0, sizeof(regs->gpr)); |
| 645 | regs->ctr = 0; |
| 646 | regs->link = 0; |
| 647 | regs->xer = 0; |
| 648 | regs->ccr = 0; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 649 | regs->gpr[1] = sp; |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 650 | |
Roland McGrath | 474f819 | 2007-09-24 16:52:44 -0700 | [diff] [blame] | 651 | /* |
| 652 | * We have just cleared all the nonvolatile GPRs, so make |
| 653 | * FULL_REGS(regs) return true. This is necessary to allow |
| 654 | * ptrace to examine the thread immediately after exec. |
| 655 | */ |
| 656 | regs->trap &= ~1UL; |
| 657 | |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 658 | #ifdef CONFIG_PPC32 |
| 659 | regs->mq = 0; |
| 660 | regs->nip = start; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 661 | regs->msr = MSR_USER; |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 662 | #else |
Stephen Rothwell | d4bf9a7 | 2005-10-13 13:40:54 +1000 | [diff] [blame] | 663 | if (!test_thread_flag(TIF_32BIT)) { |
Michael Ellerman | 90eac72 | 2005-10-21 16:01:33 +1000 | [diff] [blame] | 664 | unsigned long entry, toc; |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 665 | |
| 666 | /* start is a relocated pointer to the function descriptor for |
| 667 | * the elf _start routine. The first entry in the function |
| 668 | * descriptor is the entry address of _start and the second |
| 669 | * entry is the TOC value we need to use. |
| 670 | */ |
| 671 | __get_user(entry, (unsigned long __user *)start); |
| 672 | __get_user(toc, (unsigned long __user *)start+1); |
| 673 | |
| 674 | /* Check whether the e_entry function descriptor entries |
| 675 | * need to be relocated before we can use them. |
| 676 | */ |
| 677 | if (load_addr != 0) { |
| 678 | entry += load_addr; |
| 679 | toc += load_addr; |
| 680 | } |
| 681 | regs->nip = entry; |
| 682 | regs->gpr[2] = toc; |
| 683 | regs->msr = MSR_USER64; |
Stephen Rothwell | d4bf9a7 | 2005-10-13 13:40:54 +1000 | [diff] [blame] | 684 | } else { |
| 685 | regs->nip = start; |
| 686 | regs->gpr[2] = 0; |
| 687 | regs->msr = MSR_USER32; |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 688 | } |
| 689 | #endif |
| 690 | |
Paul Mackerras | 48abec0 | 2005-11-30 13:20:54 +1100 | [diff] [blame] | 691 | discard_lazy_cpu_state(); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 692 | memset(current->thread.fpr, 0, sizeof(current->thread.fpr)); |
David Gibson | 25c8a78 | 2005-10-27 16:27:25 +1000 | [diff] [blame] | 693 | current->thread.fpscr.val = 0; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 694 | #ifdef CONFIG_ALTIVEC |
| 695 | memset(current->thread.vr, 0, sizeof(current->thread.vr)); |
| 696 | memset(¤t->thread.vscr, 0, sizeof(current->thread.vscr)); |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 697 | current->thread.vscr.u[3] = 0x00010000; /* Java mode disabled */ |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 698 | current->thread.vrsave = 0; |
| 699 | current->thread.used_vr = 0; |
| 700 | #endif /* CONFIG_ALTIVEC */ |
| 701 | #ifdef CONFIG_SPE |
| 702 | memset(current->thread.evr, 0, sizeof(current->thread.evr)); |
| 703 | current->thread.acc = 0; |
| 704 | current->thread.spefscr = 0; |
| 705 | current->thread.used_spe = 0; |
| 706 | #endif /* CONFIG_SPE */ |
| 707 | } |
| 708 | |
| 709 | #define PR_FP_ALL_EXCEPT (PR_FP_EXC_DIV | PR_FP_EXC_OVF | PR_FP_EXC_UND \ |
| 710 | | PR_FP_EXC_RES | PR_FP_EXC_INV) |
| 711 | |
| 712 | int set_fpexc_mode(struct task_struct *tsk, unsigned int val) |
| 713 | { |
| 714 | struct pt_regs *regs = tsk->thread.regs; |
| 715 | |
| 716 | /* This is a bit hairy. If we are an SPE enabled processor |
| 717 | * (have embedded fp) we store the IEEE exception enable flags in |
| 718 | * fpexc_mode. fpexc_mode is also used for setting FP exception |
| 719 | * mode (asyn, precise, disabled) for 'Classic' FP. */ |
| 720 | if (val & PR_FP_EXC_SW_ENABLE) { |
| 721 | #ifdef CONFIG_SPE |
Kumar Gala | 5e14d21 | 2007-09-13 01:44:20 -0500 | [diff] [blame] | 722 | if (cpu_has_feature(CPU_FTR_SPE)) { |
| 723 | tsk->thread.fpexc_mode = val & |
| 724 | (PR_FP_EXC_SW_ENABLE | PR_FP_ALL_EXCEPT); |
| 725 | return 0; |
| 726 | } else { |
| 727 | return -EINVAL; |
| 728 | } |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 729 | #else |
| 730 | return -EINVAL; |
| 731 | #endif |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 732 | } |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 733 | |
| 734 | /* on a CONFIG_SPE this does not hurt us. The bits that |
| 735 | * __pack_fe01 use do not overlap with bits used for |
| 736 | * PR_FP_EXC_SW_ENABLE. Additionally, the MSR[FE0,FE1] bits |
| 737 | * on CONFIG_SPE implementations are reserved so writing to |
| 738 | * them does not change anything */ |
| 739 | if (val > PR_FP_EXC_PRECISE) |
| 740 | return -EINVAL; |
| 741 | tsk->thread.fpexc_mode = __pack_fe01(val); |
| 742 | if (regs != NULL && (regs->msr & MSR_FP) != 0) |
| 743 | regs->msr = (regs->msr & ~(MSR_FE0|MSR_FE1)) |
| 744 | | tsk->thread.fpexc_mode; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 745 | return 0; |
| 746 | } |
| 747 | |
| 748 | int get_fpexc_mode(struct task_struct *tsk, unsigned long adr) |
| 749 | { |
| 750 | unsigned int val; |
| 751 | |
| 752 | if (tsk->thread.fpexc_mode & PR_FP_EXC_SW_ENABLE) |
| 753 | #ifdef CONFIG_SPE |
Kumar Gala | 5e14d21 | 2007-09-13 01:44:20 -0500 | [diff] [blame] | 754 | if (cpu_has_feature(CPU_FTR_SPE)) |
| 755 | val = tsk->thread.fpexc_mode; |
| 756 | else |
| 757 | return -EINVAL; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 758 | #else |
| 759 | return -EINVAL; |
| 760 | #endif |
| 761 | else |
| 762 | val = __unpack_fe01(tsk->thread.fpexc_mode); |
| 763 | return put_user(val, (unsigned int __user *) adr); |
| 764 | } |
| 765 | |
Paul Mackerras | fab5db9 | 2006-06-07 16:14:40 +1000 | [diff] [blame] | 766 | int set_endian(struct task_struct *tsk, unsigned int val) |
| 767 | { |
| 768 | struct pt_regs *regs = tsk->thread.regs; |
| 769 | |
| 770 | if ((val == PR_ENDIAN_LITTLE && !cpu_has_feature(CPU_FTR_REAL_LE)) || |
| 771 | (val == PR_ENDIAN_PPC_LITTLE && !cpu_has_feature(CPU_FTR_PPC_LE))) |
| 772 | return -EINVAL; |
| 773 | |
| 774 | if (regs == NULL) |
| 775 | return -EINVAL; |
| 776 | |
| 777 | if (val == PR_ENDIAN_BIG) |
| 778 | regs->msr &= ~MSR_LE; |
| 779 | else if (val == PR_ENDIAN_LITTLE || val == PR_ENDIAN_PPC_LITTLE) |
| 780 | regs->msr |= MSR_LE; |
| 781 | else |
| 782 | return -EINVAL; |
| 783 | |
| 784 | return 0; |
| 785 | } |
| 786 | |
| 787 | int get_endian(struct task_struct *tsk, unsigned long adr) |
| 788 | { |
| 789 | struct pt_regs *regs = tsk->thread.regs; |
| 790 | unsigned int val; |
| 791 | |
| 792 | if (!cpu_has_feature(CPU_FTR_PPC_LE) && |
| 793 | !cpu_has_feature(CPU_FTR_REAL_LE)) |
| 794 | return -EINVAL; |
| 795 | |
| 796 | if (regs == NULL) |
| 797 | return -EINVAL; |
| 798 | |
| 799 | if (regs->msr & MSR_LE) { |
| 800 | if (cpu_has_feature(CPU_FTR_REAL_LE)) |
| 801 | val = PR_ENDIAN_LITTLE; |
| 802 | else |
| 803 | val = PR_ENDIAN_PPC_LITTLE; |
| 804 | } else |
| 805 | val = PR_ENDIAN_BIG; |
| 806 | |
| 807 | return put_user(val, (unsigned int __user *)adr); |
| 808 | } |
| 809 | |
Paul Mackerras | e9370ae | 2006-06-07 16:15:39 +1000 | [diff] [blame] | 810 | int set_unalign_ctl(struct task_struct *tsk, unsigned int val) |
| 811 | { |
| 812 | tsk->thread.align_ctl = val; |
| 813 | return 0; |
| 814 | } |
| 815 | |
| 816 | int get_unalign_ctl(struct task_struct *tsk, unsigned long adr) |
| 817 | { |
| 818 | return put_user(tsk->thread.align_ctl, (unsigned int __user *)adr); |
| 819 | } |
| 820 | |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 821 | #define TRUNC_PTR(x) ((typeof(x))(((unsigned long)(x)) & 0xffffffff)) |
| 822 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 823 | int sys_clone(unsigned long clone_flags, unsigned long usp, |
| 824 | int __user *parent_tidp, void __user *child_threadptr, |
| 825 | int __user *child_tidp, int p6, |
| 826 | struct pt_regs *regs) |
| 827 | { |
| 828 | CHECK_FULL_REGS(regs); |
| 829 | if (usp == 0) |
| 830 | usp = regs->gpr[1]; /* stack pointer for child */ |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 831 | #ifdef CONFIG_PPC64 |
| 832 | if (test_thread_flag(TIF_32BIT)) { |
| 833 | parent_tidp = TRUNC_PTR(parent_tidp); |
| 834 | child_tidp = TRUNC_PTR(child_tidp); |
| 835 | } |
| 836 | #endif |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 837 | return do_fork(clone_flags, usp, regs, 0, parent_tidp, child_tidp); |
| 838 | } |
| 839 | |
| 840 | int sys_fork(unsigned long p1, unsigned long p2, unsigned long p3, |
| 841 | unsigned long p4, unsigned long p5, unsigned long p6, |
| 842 | struct pt_regs *regs) |
| 843 | { |
| 844 | CHECK_FULL_REGS(regs); |
| 845 | return do_fork(SIGCHLD, regs->gpr[1], regs, 0, NULL, NULL); |
| 846 | } |
| 847 | |
| 848 | int sys_vfork(unsigned long p1, unsigned long p2, unsigned long p3, |
| 849 | unsigned long p4, unsigned long p5, unsigned long p6, |
| 850 | struct pt_regs *regs) |
| 851 | { |
| 852 | CHECK_FULL_REGS(regs); |
| 853 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->gpr[1], |
| 854 | regs, 0, NULL, NULL); |
| 855 | } |
| 856 | |
| 857 | int sys_execve(unsigned long a0, unsigned long a1, unsigned long a2, |
| 858 | unsigned long a3, unsigned long a4, unsigned long a5, |
| 859 | struct pt_regs *regs) |
| 860 | { |
| 861 | int error; |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 862 | char *filename; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 863 | |
| 864 | filename = getname((char __user *) a0); |
| 865 | error = PTR_ERR(filename); |
| 866 | if (IS_ERR(filename)) |
| 867 | goto out; |
| 868 | flush_fp_to_thread(current); |
| 869 | flush_altivec_to_thread(current); |
| 870 | flush_spe_to_thread(current); |
Paul Mackerras | 20c8c21 | 2005-09-28 20:28:14 +1000 | [diff] [blame] | 871 | error = do_execve(filename, (char __user * __user *) a1, |
| 872 | (char __user * __user *) a2, regs); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 873 | putname(filename); |
| 874 | out: |
| 875 | return error; |
| 876 | } |
| 877 | |
Paul Mackerras | bb72c48 | 2007-02-19 11:42:42 +1100 | [diff] [blame] | 878 | #ifdef CONFIG_IRQSTACKS |
| 879 | static inline int valid_irq_stack(unsigned long sp, struct task_struct *p, |
| 880 | unsigned long nbytes) |
| 881 | { |
| 882 | unsigned long stack_page; |
| 883 | unsigned long cpu = task_cpu(p); |
| 884 | |
| 885 | /* |
| 886 | * Avoid crashing if the stack has overflowed and corrupted |
| 887 | * task_cpu(p), which is in the thread_info struct. |
| 888 | */ |
| 889 | if (cpu < NR_CPUS && cpu_possible(cpu)) { |
| 890 | stack_page = (unsigned long) hardirq_ctx[cpu]; |
| 891 | if (sp >= stack_page + sizeof(struct thread_struct) |
| 892 | && sp <= stack_page + THREAD_SIZE - nbytes) |
| 893 | return 1; |
| 894 | |
| 895 | stack_page = (unsigned long) softirq_ctx[cpu]; |
| 896 | if (sp >= stack_page + sizeof(struct thread_struct) |
| 897 | && sp <= stack_page + THREAD_SIZE - nbytes) |
| 898 | return 1; |
| 899 | } |
| 900 | return 0; |
| 901 | } |
| 902 | |
| 903 | #else |
| 904 | #define valid_irq_stack(sp, p, nb) 0 |
| 905 | #endif /* CONFIG_IRQSTACKS */ |
| 906 | |
Anton Blanchard | 2f25194 | 2006-03-27 11:46:18 +1100 | [diff] [blame] | 907 | int validate_sp(unsigned long sp, struct task_struct *p, |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 908 | unsigned long nbytes) |
| 909 | { |
Al Viro | 0cec6fd | 2006-01-12 01:06:02 -0800 | [diff] [blame] | 910 | unsigned long stack_page = (unsigned long)task_stack_page(p); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 911 | |
| 912 | if (sp >= stack_page + sizeof(struct thread_struct) |
| 913 | && sp <= stack_page + THREAD_SIZE - nbytes) |
| 914 | return 1; |
| 915 | |
Paul Mackerras | bb72c48 | 2007-02-19 11:42:42 +1100 | [diff] [blame] | 916 | return valid_irq_stack(sp, p, nbytes); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 917 | } |
| 918 | |
Anton Blanchard | 2f25194 | 2006-03-27 11:46:18 +1100 | [diff] [blame] | 919 | EXPORT_SYMBOL(validate_sp); |
| 920 | |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 921 | unsigned long get_wchan(struct task_struct *p) |
| 922 | { |
| 923 | unsigned long ip, sp; |
| 924 | int count = 0; |
| 925 | |
| 926 | if (!p || p == current || p->state == TASK_RUNNING) |
| 927 | return 0; |
| 928 | |
| 929 | sp = p->thread.ksp; |
Benjamin Herrenschmidt | ec2b36b | 2008-04-17 14:34:59 +1000 | [diff] [blame] | 930 | if (!validate_sp(sp, p, STACK_FRAME_OVERHEAD)) |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 931 | return 0; |
| 932 | |
| 933 | do { |
| 934 | sp = *(unsigned long *)sp; |
Benjamin Herrenschmidt | ec2b36b | 2008-04-17 14:34:59 +1000 | [diff] [blame] | 935 | if (!validate_sp(sp, p, STACK_FRAME_OVERHEAD)) |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 936 | return 0; |
| 937 | if (count > 0) { |
Benjamin Herrenschmidt | ec2b36b | 2008-04-17 14:34:59 +1000 | [diff] [blame] | 938 | ip = ((unsigned long *)sp)[STACK_FRAME_LR_SAVE]; |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 939 | if (!in_sched_functions(ip)) |
| 940 | return ip; |
| 941 | } |
| 942 | } while (count++ < 16); |
| 943 | return 0; |
| 944 | } |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 945 | |
| 946 | static int kstack_depth_to_print = 64; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 947 | |
| 948 | void show_stack(struct task_struct *tsk, unsigned long *stack) |
| 949 | { |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 950 | unsigned long sp, ip, lr, newsp; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 951 | int count = 0; |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 952 | int firstframe = 1; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 953 | |
| 954 | sp = (unsigned long) stack; |
| 955 | if (tsk == NULL) |
| 956 | tsk = current; |
| 957 | if (sp == 0) { |
| 958 | if (tsk == current) |
| 959 | asm("mr %0,1" : "=r" (sp)); |
| 960 | else |
| 961 | sp = tsk->thread.ksp; |
| 962 | } |
| 963 | |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 964 | lr = 0; |
| 965 | printk("Call Trace:\n"); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 966 | do { |
Benjamin Herrenschmidt | ec2b36b | 2008-04-17 14:34:59 +1000 | [diff] [blame] | 967 | if (!validate_sp(sp, tsk, STACK_FRAME_OVERHEAD)) |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 968 | return; |
| 969 | |
| 970 | stack = (unsigned long *) sp; |
| 971 | newsp = stack[0]; |
Benjamin Herrenschmidt | ec2b36b | 2008-04-17 14:34:59 +1000 | [diff] [blame] | 972 | ip = stack[STACK_FRAME_LR_SAVE]; |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 973 | if (!firstframe || ip != lr) { |
| 974 | printk("["REG"] ["REG"] ", sp, ip); |
| 975 | print_symbol("%s", ip); |
| 976 | if (firstframe) |
| 977 | printk(" (unreliable)"); |
| 978 | printk("\n"); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 979 | } |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 980 | firstframe = 0; |
| 981 | |
| 982 | /* |
| 983 | * See if this is an exception frame. |
| 984 | * We look for the "regshere" marker in the current frame. |
| 985 | */ |
Benjamin Herrenschmidt | ec2b36b | 2008-04-17 14:34:59 +1000 | [diff] [blame] | 986 | if (validate_sp(sp, tsk, STACK_INT_FRAME_SIZE) |
| 987 | && stack[STACK_FRAME_MARKER] == STACK_FRAME_REGS_MARKER) { |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 988 | struct pt_regs *regs = (struct pt_regs *) |
| 989 | (sp + STACK_FRAME_OVERHEAD); |
| 990 | printk("--- Exception: %lx", regs->trap); |
| 991 | print_symbol(" at %s\n", regs->nip); |
| 992 | lr = regs->link; |
| 993 | print_symbol(" LR = %s\n", lr); |
| 994 | firstframe = 1; |
| 995 | } |
| 996 | |
| 997 | sp = newsp; |
| 998 | } while (count++ < kstack_depth_to_print); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 999 | } |
Paul Mackerras | 06d67d5 | 2005-10-10 22:29:05 +1000 | [diff] [blame] | 1000 | |
| 1001 | void dump_stack(void) |
| 1002 | { |
| 1003 | show_stack(current, NULL); |
| 1004 | } |
| 1005 | EXPORT_SYMBOL(dump_stack); |
Anton Blanchard | cb2c9b2 | 2006-02-13 14:48:35 +1100 | [diff] [blame] | 1006 | |
| 1007 | #ifdef CONFIG_PPC64 |
| 1008 | void ppc64_runlatch_on(void) |
| 1009 | { |
| 1010 | unsigned long ctrl; |
| 1011 | |
| 1012 | if (cpu_has_feature(CPU_FTR_CTRL) && !test_thread_flag(TIF_RUNLATCH)) { |
| 1013 | HMT_medium(); |
| 1014 | |
| 1015 | ctrl = mfspr(SPRN_CTRLF); |
| 1016 | ctrl |= CTRL_RUNLATCH; |
| 1017 | mtspr(SPRN_CTRLT, ctrl); |
| 1018 | |
| 1019 | set_thread_flag(TIF_RUNLATCH); |
| 1020 | } |
| 1021 | } |
| 1022 | |
| 1023 | void ppc64_runlatch_off(void) |
| 1024 | { |
| 1025 | unsigned long ctrl; |
| 1026 | |
| 1027 | if (cpu_has_feature(CPU_FTR_CTRL) && test_thread_flag(TIF_RUNLATCH)) { |
| 1028 | HMT_medium(); |
| 1029 | |
| 1030 | clear_thread_flag(TIF_RUNLATCH); |
| 1031 | |
| 1032 | ctrl = mfspr(SPRN_CTRLF); |
| 1033 | ctrl &= ~CTRL_RUNLATCH; |
| 1034 | mtspr(SPRN_CTRLT, ctrl); |
| 1035 | } |
| 1036 | } |
| 1037 | #endif |
Benjamin Herrenschmidt | f6a6168 | 2008-04-18 16:56:17 +1000 | [diff] [blame] | 1038 | |
| 1039 | #if THREAD_SHIFT < PAGE_SHIFT |
| 1040 | |
| 1041 | static struct kmem_cache *thread_info_cache; |
| 1042 | |
| 1043 | struct thread_info *alloc_thread_info(struct task_struct *tsk) |
| 1044 | { |
| 1045 | struct thread_info *ti; |
| 1046 | |
| 1047 | ti = kmem_cache_alloc(thread_info_cache, GFP_KERNEL); |
| 1048 | if (unlikely(ti == NULL)) |
| 1049 | return NULL; |
| 1050 | #ifdef CONFIG_DEBUG_STACK_USAGE |
| 1051 | memset(ti, 0, THREAD_SIZE); |
| 1052 | #endif |
| 1053 | return ti; |
| 1054 | } |
| 1055 | |
| 1056 | void free_thread_info(struct thread_info *ti) |
| 1057 | { |
| 1058 | kmem_cache_free(thread_info_cache, ti); |
| 1059 | } |
| 1060 | |
| 1061 | void thread_info_cache_init(void) |
| 1062 | { |
| 1063 | thread_info_cache = kmem_cache_create("thread_info", THREAD_SIZE, |
| 1064 | THREAD_SIZE, 0, NULL); |
| 1065 | BUG_ON(thread_info_cache == NULL); |
| 1066 | } |
| 1067 | |
| 1068 | #endif /* THREAD_SHIFT < PAGE_SHIFT */ |