From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- arch/ppc64/kernel/process.c | 688 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 688 insertions(+) create mode 100644 arch/ppc64/kernel/process.c (limited to 'arch/ppc64/kernel/process.c') diff --git a/arch/ppc64/kernel/process.c b/arch/ppc64/kernel/process.c new file mode 100644 index 00000000000..8b068612273 --- /dev/null +++ b/arch/ppc64/kernel/process.c @@ -0,0 +1,688 @@ +/* + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#ifndef CONFIG_SMP +struct task_struct *last_task_used_math = NULL; +struct task_struct *last_task_used_altivec = NULL; +#endif + +struct mm_struct ioremap_mm = { + .pgd = ioremap_dir, + .mm_users = ATOMIC_INIT(2), + .mm_count = ATOMIC_INIT(1), + .cpu_vm_mask = CPU_MASK_ALL, + .page_table_lock = SPIN_LOCK_UNLOCKED, +}; + +/* + * 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 */ + +DEFINE_PER_CPU(struct cpu_usage, cpu_usage_array); + +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 */ + + 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 defined(CONFIG_PPC_PSERIES) + if (cur_cpu_spec->firmware_features & 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; + } +#endif + + + 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) +{ +#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(); + + 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 */ +} + +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); +#ifdef CONFIG_PPC_ISERIES + set_ti_thread_flag(p->thread_info, TIF_RUN_LIGHT); +#endif + } 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); -- cgit v1.2.3