diff options
Diffstat (limited to 'arch/ppc64')
| -rw-r--r-- | arch/ppc64/kernel/Makefile | 4 | ||||
| -rw-r--r-- | arch/ppc64/kernel/init_task.c | 36 | ||||
| -rw-r--r-- | arch/ppc64/kernel/process.c | 713 |
3 files changed, 2 insertions, 751 deletions
diff --git a/arch/ppc64/kernel/Makefile b/arch/ppc64/kernel/Makefile index 5c598892f89..5569ea7e683 100644 --- a/arch/ppc64/kernel/Makefile +++ b/arch/ppc64/kernel/Makefile @@ -8,10 +8,10 @@ EXTRA_CFLAGS += -mno-minimal-toc extra-y := head.o vmlinux.lds obj-y := setup.o entry.o irq.o idle.o dma.o \ - time.o process.o signal.o syscalls.o misc.o ptrace.o \ + time.o signal.o syscalls.o misc.o ptrace.o \ align.o bitops.o pacaData.o \ udbg.o binfmt_elf32.o sys_ppc32.o ioctl32.o \ - ptrace32.o signal32.o rtc.o init_task.o \ + ptrace32.o signal32.o rtc.o \ cputable.o cpu_setup_power4.o \ iommu.o sysfs.o vdso.o pmc.o firmware.o prom.o obj-y += vdso32/ vdso64/ diff --git a/arch/ppc64/kernel/init_task.c b/arch/ppc64/kernel/init_task.c deleted file mode 100644 index 941043ae040..00000000000 --- a/arch/ppc64/kernel/init_task.c +++ /dev/null @@ -1,36 +0,0 @@ -#include <linux/mm.h> -#include <linux/module.h> -#include <linux/sched.h> -#include <linux/init.h> -#include <linux/init_task.h> -#include <linux/fs.h> -#include <linux/mqueue.h> -#include <asm/uaccess.h> - -static struct fs_struct init_fs = INIT_FS; -static struct files_struct init_files = INIT_FILES; -static struct signal_struct init_signals = INIT_SIGNALS(init_signals); -static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand); -struct mm_struct init_mm = INIT_MM(init_mm); - -EXPORT_SYMBOL(init_mm); - -/* - * Initial thread structure. - * - * We need to make sure that this is 16384-byte aligned due to the - * way process stacks are handled. This is done by having a special - * "init_task" linker map entry.. - */ -union thread_union init_thread_union - __attribute__((__section__(".data.init_task"))) = - { INIT_THREAD_INFO(init_task) }; - -/* - * Initial task structure. - * - * All other task structs will be allocated on slabs in fork.c - */ -struct task_struct init_task = INIT_TASK(init_task); - -EXPORT_SYMBOL(init_task); diff --git a/arch/ppc64/kernel/process.c b/arch/ppc64/kernel/process.c deleted file mode 100644 index 887005358eb..00000000000 --- a/arch/ppc64/kernel/process.c +++ /dev/null @@ -1,713 +0,0 @@ -/* - * linux/arch/ppc64/kernel/process.c - * - * Derived from "arch/i386/kernel/process.c" - * Copyright (C) 1995 Linus Torvalds - * - * Updated and modified by Cort Dougan (cort@cs.nmt.edu) and - * Paul Mackerras (paulus@cs.anu.edu.au) - * - * PowerPC version - * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. - */ - -#include <linux/config.h> -#include <linux/module.h> -#include <linux/errno.h> -#include <linux/sched.h> -#include <linux/kernel.h> -#include <linux/mm.h> -#include <linux/smp.h> -#include <linux/smp_lock.h> -#include <linux/stddef.h> -#include <linux/unistd.h> -#include <linux/slab.h> -#include <linux/user.h> -#include <linux/elf.h> -#include <linux/init.h> -#include <linux/init_task.h> -#include <linux/prctl.h> -#include <linux/ptrace.h> -#include <linux/kallsyms.h> -#include <linux/interrupt.h> -#include <linux/utsname.h> -#include <linux/kprobes.h> - -#include <asm/pgtable.h> -#include <asm/uaccess.h> -#include <asm/system.h> -#include <asm/io.h> -#include <asm/processor.h> -#include <asm/mmu.h> -#include <asm/mmu_context.h> -#include <asm/prom.h> -#include <asm/ppcdebug.h> -#include <asm/machdep.h> -#include <asm/iSeries/HvCallHpt.h> -#include <asm/cputable.h> -#include <asm/firmware.h> -#include <asm/sections.h> -#include <asm/tlbflush.h> -#include <asm/time.h> -#include <asm/plpar_wrappers.h> - -#ifndef CONFIG_SMP -struct task_struct *last_task_used_math = NULL; -struct task_struct *last_task_used_altivec = NULL; -#endif - -/* - * Make sure the floating-point register state in the - * the thread_struct is up to date for task tsk. - */ -void flush_fp_to_thread(struct task_struct *tsk) -{ - if (tsk->thread.regs) { - /* - * We need to disable preemption here because if we didn't, - * another process could get scheduled after the regs->msr - * test but before we have finished saving the FP registers - * to the thread_struct. That process could take over the - * FPU, and then when we get scheduled again we would store - * bogus values for the remaining FP registers. - */ - preempt_disable(); - if (tsk->thread.regs->msr & MSR_FP) { -#ifdef CONFIG_SMP - /* - * This should only ever be called for current or - * for a stopped child process. Since we save away - * the FP register state on context switch on SMP, - * there is something wrong if a stopped child appears - * to still have its FP state in the CPU registers. - */ - BUG_ON(tsk != current); -#endif - giveup_fpu(current); - } - preempt_enable(); - } -} - -void enable_kernel_fp(void) -{ - WARN_ON(preemptible()); - -#ifdef CONFIG_SMP - if (current->thread.regs && (current->thread.regs->msr & MSR_FP)) - giveup_fpu(current); - else - giveup_fpu(NULL); /* just enables FP for kernel */ -#else - giveup_fpu(last_task_used_math); -#endif /* CONFIG_SMP */ -} -EXPORT_SYMBOL(enable_kernel_fp); - -int dump_task_fpu(struct task_struct *tsk, elf_fpregset_t *fpregs) -{ - if (!tsk->thread.regs) - return 0; - flush_fp_to_thread(current); - - memcpy(fpregs, &tsk->thread.fpr[0], sizeof(*fpregs)); - - return 1; -} - -#ifdef CONFIG_ALTIVEC - -void enable_kernel_altivec(void) -{ - WARN_ON(preemptible()); - -#ifdef CONFIG_SMP - if (current->thread.regs && (current->thread.regs->msr & MSR_VEC)) - giveup_altivec(current); - else - giveup_altivec(NULL); /* just enables FP for kernel */ -#else - giveup_altivec(last_task_used_altivec); -#endif /* CONFIG_SMP */ -} -EXPORT_SYMBOL(enable_kernel_altivec); - -/* - * Make sure the VMX/Altivec register state in the - * the thread_struct is up to date for task tsk. - */ -void flush_altivec_to_thread(struct task_struct *tsk) -{ - if (tsk->thread.regs) { - preempt_disable(); - if (tsk->thread.regs->msr & MSR_VEC) { -#ifdef CONFIG_SMP - BUG_ON(tsk != current); -#endif - giveup_altivec(current); - } - preempt_enable(); - } -} - -int dump_task_altivec(struct pt_regs *regs, elf_vrregset_t *vrregs) -{ - flush_altivec_to_thread(current); - memcpy(vrregs, ¤t->thread.vr[0], sizeof(*vrregs)); - return 1; -} - -#endif /* CONFIG_ALTIVEC */ - -static void set_dabr_spr(unsigned long val) -{ - mtspr(SPRN_DABR, val); -} - -int set_dabr(unsigned long dabr) -{ - int ret = 0; - - if (firmware_has_feature(FW_FEATURE_XDABR)) { - /* We want to catch accesses from kernel and userspace */ - unsigned long flags = H_DABRX_KERNEL|H_DABRX_USER; - ret = plpar_set_xdabr(dabr, flags); - } else if (firmware_has_feature(FW_FEATURE_DABR)) { - ret = plpar_set_dabr(dabr); - } else { - set_dabr_spr(dabr); - } - - return ret; -} - -DEFINE_PER_CPU(struct cpu_usage, cpu_usage_array); -static DEFINE_PER_CPU(unsigned long, current_dabr); - -struct task_struct *__switch_to(struct task_struct *prev, - struct task_struct *new) -{ - struct thread_struct *new_thread, *old_thread; - unsigned long flags; - struct task_struct *last; - -#ifdef CONFIG_SMP - /* avoid complexity of lazy save/restore of fpu - * by just saving it every time we switch out if - * this task used the fpu during the last quantum. - * - * If it tries to use the fpu again, it'll trap and - * reload its fp regs. So we don't have to do a restore - * every switch, just a save. - * -- Cort - */ - if (prev->thread.regs && (prev->thread.regs->msr & MSR_FP)) - giveup_fpu(prev); -#ifdef CONFIG_ALTIVEC - if (prev->thread.regs && (prev->thread.regs->msr & MSR_VEC)) - giveup_altivec(prev); -#endif /* CONFIG_ALTIVEC */ -#endif /* CONFIG_SMP */ - -#if defined(CONFIG_ALTIVEC) && !defined(CONFIG_SMP) - /* Avoid the trap. On smp this this never happens since - * we don't set last_task_used_altivec -- Cort - */ - if (new->thread.regs && last_task_used_altivec == new) - new->thread.regs->msr |= MSR_VEC; -#endif /* CONFIG_ALTIVEC */ - - if (unlikely(__get_cpu_var(current_dabr) != new->thread.dabr)) { - set_dabr(new->thread.dabr); - __get_cpu_var(current_dabr) = new->thread.dabr; - } - - flush_tlb_pending(); - - new_thread = &new->thread; - old_thread = ¤t->thread; - - /* Collect purr utilization data per process and per processor - * wise purr is nothing but processor time base - */ - if (firmware_has_feature(FW_FEATURE_SPLPAR)) { - struct cpu_usage *cu = &__get_cpu_var(cpu_usage_array); - long unsigned start_tb, current_tb; - start_tb = old_thread->start_tb; - cu->current_tb = current_tb = mfspr(SPRN_PURR); - old_thread->accum_tb += (current_tb - start_tb); - new_thread->start_tb = current_tb; - } - - local_irq_save(flags); - last = _switch(old_thread, new_thread); - - local_irq_restore(flags); - - return last; -} - -static int instructions_to_print = 16; - -static void show_instructions(struct pt_regs *regs) -{ - int i; - unsigned long pc = regs->nip - (instructions_to_print * 3 / 4 * - sizeof(int)); - - printk("Instruction dump:"); - - for (i = 0; i < instructions_to_print; i++) { - int instr; - - if (!(i % 8)) - printk("\n"); - - if (((REGION_ID(pc) != KERNEL_REGION_ID) && - (REGION_ID(pc) != VMALLOC_REGION_ID)) || - __get_user(instr, (unsigned int *)pc)) { - printk("XXXXXXXX "); - } else { - if (regs->nip == pc) - printk("<%08x> ", instr); - else - printk("%08x ", instr); - } - - pc += sizeof(int); - } - - printk("\n"); -} - -void show_regs(struct pt_regs * regs) -{ - int i; - unsigned long trap; - - printk("NIP: %016lX XER: %08X LR: %016lX CTR: %016lX\n", - regs->nip, (unsigned int)regs->xer, regs->link, regs->ctr); - printk("REGS: %p TRAP: %04lx %s (%s)\n", - regs, regs->trap, print_tainted(), system_utsname.release); - printk("MSR: %016lx EE: %01x PR: %01x FP: %01x ME: %01x " - "IR/DR: %01x%01x CR: %08X\n", - regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0, - regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0, - regs->msr&MSR_IR ? 1 : 0, - regs->msr&MSR_DR ? 1 : 0, - (unsigned int)regs->ccr); - trap = TRAP(regs); - printk("DAR: %016lx DSISR: %016lx\n", regs->dar, regs->dsisr); - printk("TASK: %p[%d] '%s' THREAD: %p", - current, current->pid, current->comm, current->thread_info); - -#ifdef CONFIG_SMP - printk(" CPU: %d", smp_processor_id()); -#endif /* CONFIG_SMP */ - - for (i = 0; i < 32; i++) { - if ((i % 4) == 0) { - printk("\n" KERN_INFO "GPR%02d: ", i); - } - - printk("%016lX ", regs->gpr[i]); - if (i == 13 && !FULL_REGS(regs)) - break; - } - printk("\n"); - /* - * Lookup NIP late so we have the best change of getting the - * above info out without failing - */ - printk("NIP [%016lx] ", regs->nip); - print_symbol("%s\n", regs->nip); - printk("LR [%016lx] ", regs->link); - print_symbol("%s\n", regs->link); - show_stack(current, (unsigned long *)regs->gpr[1]); - if (!user_mode(regs)) - show_instructions(regs); -} - -void exit_thread(void) -{ - kprobe_flush_task(current); - -#ifndef CONFIG_SMP - if (last_task_used_math == current) - last_task_used_math = NULL; -#ifdef CONFIG_ALTIVEC - if (last_task_used_altivec == current) - last_task_used_altivec = NULL; -#endif /* CONFIG_ALTIVEC */ -#endif /* CONFIG_SMP */ -} - -void flush_thread(void) -{ - struct thread_info *t = current_thread_info(); - - kprobe_flush_task(current); - if (t->flags & _TIF_ABI_PENDING) - t->flags ^= (_TIF_ABI_PENDING | _TIF_32BIT); - -#ifndef CONFIG_SMP - if (last_task_used_math == current) - last_task_used_math = NULL; -#ifdef CONFIG_ALTIVEC - if (last_task_used_altivec == current) - last_task_used_altivec = NULL; -#endif /* CONFIG_ALTIVEC */ -#endif /* CONFIG_SMP */ - - if (current->thread.dabr) { - current->thread.dabr = 0; - set_dabr(0); - } -} - -void -release_thread(struct task_struct *t) -{ -} - - -/* - * This gets called before we allocate a new thread and copy - * the current task into it. - */ -void prepare_to_copy(struct task_struct *tsk) -{ - flush_fp_to_thread(current); - flush_altivec_to_thread(current); -} - -/* - * Copy a thread.. - */ -int -copy_thread(int nr, unsigned long clone_flags, unsigned long usp, - unsigned long unused, struct task_struct *p, struct pt_regs *regs) -{ - struct pt_regs *childregs, *kregs; - extern void ret_from_fork(void); - unsigned long sp = (unsigned long)p->thread_info + THREAD_SIZE; - - /* Copy registers */ - sp -= sizeof(struct pt_regs); - childregs = (struct pt_regs *) sp; - *childregs = *regs; - if ((childregs->msr & MSR_PR) == 0) { - /* for kernel thread, set stackptr in new task */ - childregs->gpr[1] = sp + sizeof(struct pt_regs); - p->thread.regs = NULL; /* no user register state */ - clear_ti_thread_flag(p->thread_info, TIF_32BIT); - } else { - childregs->gpr[1] = usp; - p->thread.regs = childregs; - if (clone_flags & CLONE_SETTLS) { - if (test_thread_flag(TIF_32BIT)) - childregs->gpr[2] = childregs->gpr[6]; - else - childregs->gpr[13] = childregs->gpr[6]; - } - } - childregs->gpr[3] = 0; /* Result from fork() */ - sp -= STACK_FRAME_OVERHEAD; - - /* - * The way this works is that at some point in the future - * some task will call _switch to switch to the new task. - * That will pop off the stack frame created below and start - * the new task running at ret_from_fork. The new task will - * do some house keeping and then return from the fork or clone - * system call, using the stack frame created above. - */ - sp -= sizeof(struct pt_regs); - kregs = (struct pt_regs *) sp; - sp -= STACK_FRAME_OVERHEAD; - p->thread.ksp = sp; - if (cpu_has_feature(CPU_FTR_SLB)) { - unsigned long sp_vsid = get_kernel_vsid(sp); - - sp_vsid <<= SLB_VSID_SHIFT; - sp_vsid |= SLB_VSID_KERNEL; - if (cpu_has_feature(CPU_FTR_16M_PAGE)) - sp_vsid |= SLB_VSID_L; - - p->thread.ksp_vsid = sp_vsid; - } - - /* - * The PPC64 ABI makes use of a TOC to contain function - * pointers. The function (ret_from_except) is actually a pointer - * to the TOC entry. The first entry is a pointer to the actual - * function. - */ - kregs->nip = *((unsigned long *)ret_from_fork); - - return 0; -} - -/* - * Set up a thread for executing a new program - */ -void start_thread(struct pt_regs *regs, unsigned long fdptr, unsigned long sp) -{ - unsigned long entry, toc, load_addr = regs->gpr[2]; - - /* fdptr is a relocated pointer to the function descriptor for - * the elf _start routine. The first entry in the function - * descriptor is the entry address of _start and the second - * entry is the TOC value we need to use. - */ - set_fs(USER_DS); - __get_user(entry, (unsigned long __user *)fdptr); - __get_user(toc, (unsigned long __user *)fdptr+1); - - /* Check whether the e_entry function descriptor entries - * need to be relocated before we can use them. - */ - if (load_addr != 0) { - entry += load_addr; - toc += load_addr; - } - - /* - * If we exec out of a kernel thread then thread.regs will not be - * set. Do it now. - */ - if (!current->thread.regs) { - unsigned long childregs = (unsigned long)current->thread_info + - THREAD_SIZE; - childregs -= sizeof(struct pt_regs); - current->thread.regs = (struct pt_regs *)childregs; - } - - regs->nip = entry; - regs->gpr[1] = sp; - regs->gpr[2] = toc; - regs->msr = MSR_USER64; -#ifndef CONFIG_SMP - if (last_task_used_math == current) - last_task_used_math = 0; -#endif /* CONFIG_SMP */ - memset(current->thread.fpr, 0, sizeof(current->thread.fpr)); - current->thread.fpscr = 0; -#ifdef CONFIG_ALTIVEC -#ifndef CONFIG_SMP - if (last_task_used_altivec == current) - last_task_used_altivec = 0; -#endif /* CONFIG_SMP */ - memset(current->thread.vr, 0, sizeof(current->thread.vr)); - current->thread.vscr.u[0] = 0; - current->thread.vscr.u[1] = 0; - current->thread.vscr.u[2] = 0; - current->thread.vscr.u[3] = 0x00010000; /* Java mode disabled */ - current->thread.vrsave = 0; - current->thread.used_vr = 0; -#endif /* CONFIG_ALTIVEC */ -} -EXPORT_SYMBOL(start_thread); - -int set_fpexc_mode(struct task_struct *tsk, unsigned int val) -{ - struct pt_regs *regs = tsk->thread.regs; - - if (val > PR_FP_EXC_PRECISE) - return -EINVAL; - tsk->thread.fpexc_mode = __pack_fe01(val); - if (regs != NULL && (regs->msr & MSR_FP) != 0) - regs->msr = (regs->msr & ~(MSR_FE0|MSR_FE1)) - | tsk->thread.fpexc_mode; - return 0; -} - -int get_fpexc_mode(struct task_struct *tsk, unsigned long adr) -{ - unsigned int val; - - val = __unpack_fe01(tsk->thread.fpexc_mode); - return put_user(val, (unsigned int __user *) adr); -} - -int sys_clone(unsigned long clone_flags, unsigned long p2, unsigned long p3, - unsigned long p4, unsigned long p5, unsigned long p6, - struct pt_regs *regs) -{ - unsigned long parent_tidptr = 0; - unsigned long child_tidptr = 0; - - if (p2 == 0) - p2 = regs->gpr[1]; /* stack pointer for child */ - - if (clone_flags & (CLONE_PARENT_SETTID | CLONE_CHILD_SETTID | - CLONE_CHILD_CLEARTID)) { - parent_tidptr = p3; - child_tidptr = p5; - if (test_thread_flag(TIF_32BIT)) { - parent_tidptr &= 0xffffffff; - child_tidptr &= 0xffffffff; - } - } - - return do_fork(clone_flags, p2, regs, 0, - (int __user *)parent_tidptr, (int __user *)child_tidptr); -} - -int sys_fork(unsigned long p1, unsigned long p2, unsigned long p3, - unsigned long p4, unsigned long p5, unsigned long p6, - struct pt_regs *regs) -{ - return do_fork(SIGCHLD, regs->gpr[1], regs, 0, NULL, NULL); -} - -int sys_vfork(unsigned long p1, unsigned long p2, unsigned long p3, - unsigned long p4, unsigned long p5, unsigned long p6, - struct pt_regs *regs) -{ - return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->gpr[1], regs, 0, - NULL, NULL); -} - -int sys_execve(unsigned long a0, unsigned long a1, unsigned long a2, - unsigned long a3, unsigned long a4, unsigned long a5, - struct pt_regs *regs) -{ - int error; - char * filename; - - filename = getname((char __user *) a0); - error = PTR_ERR(filename); - if (IS_ERR(filename)) - goto out; - flush_fp_to_thread(current); - flush_altivec_to_thread(current); - error = do_execve(filename, (char __user * __user *) a1, - (char __user * __user *) a2, regs); - - if (error == 0) { - task_lock(current); - current->ptrace &= ~PT_DTRACE; - task_unlock(current); - } - putname(filename); - -out: - return error; -} - -static int kstack_depth_to_print = 64; - -static int validate_sp(unsigned long sp, struct task_struct *p, - unsigned long nbytes) -{ - unsigned long stack_page = (unsigned long)p->thread_info; - - if (sp >= stack_page + sizeof(struct thread_struct) - && sp <= stack_page + THREAD_SIZE - nbytes) - return 1; - -#ifdef CONFIG_IRQSTACKS - stack_page = (unsigned long) hardirq_ctx[task_cpu(p)]; - if (sp >= stack_page + sizeof(struct thread_struct) - && sp <= stack_page + THREAD_SIZE - nbytes) - return 1; - - stack_page = (unsigned long) softirq_ctx[task_cpu(p)]; - if (sp >= stack_page + sizeof(struct thread_struct) - && sp <= stack_page + THREAD_SIZE - nbytes) - return 1; -#endif - - return 0; -} - -unsigned long get_wchan(struct task_struct *p) -{ - unsigned long ip, sp; - int count = 0; - - if (!p || p == current || p->state == TASK_RUNNING) - return 0; - - sp = p->thread.ksp; - if (!validate_sp(sp, p, 112)) - return 0; - - do { - sp = *(unsigned long *)sp; - if (!validate_sp(sp, p, 112)) - return 0; - if (count > 0) { - ip = *(unsigned long *)(sp + 16); - if (!in_sched_functions(ip)) - return ip; - } - } while (count++ < 16); - return 0; -} -EXPORT_SYMBOL(get_wchan); - -void show_stack(struct task_struct *p, unsigned long *_sp) -{ - unsigned long ip, newsp, lr; - int count = 0; - unsigned long sp = (unsigned long)_sp; - int firstframe = 1; - - if (sp == 0) { - if (p) { - sp = p->thread.ksp; - } else { - sp = __get_SP(); - p = current; - } - } - - lr = 0; - printk("Call Trace:\n"); - do { - if (!validate_sp(sp, p, 112)) - return; - - _sp = (unsigned long *) sp; - newsp = _sp[0]; - ip = _sp[2]; - if (!firstframe || ip != lr) { - printk("[%016lx] [%016lx] ", sp, ip); - print_symbol("%s", ip); - if (firstframe) - printk(" (unreliable)"); - printk("\n"); - } - firstframe = 0; - - /* - * See if this is an exception frame. - * We look for the "regshere" marker in the current frame. - */ - if (validate_sp(sp, p, sizeof(struct pt_regs) + 400) - && _sp[12] == 0x7265677368657265ul) { - struct pt_regs *regs = (struct pt_regs *) - (sp + STACK_FRAME_OVERHEAD); - printk("--- Exception: %lx", regs->trap); - print_symbol(" at %s\n", regs->nip); - lr = regs->link; - print_symbol(" LR = %s\n", lr); - firstframe = 1; - } - - sp = newsp; - } while (count++ < kstack_depth_to_print); -} - -void dump_stack(void) -{ - show_stack(current, (unsigned long *)__get_SP()); -} -EXPORT_SYMBOL(dump_stack); |