diff options
Diffstat (limited to 'arch/sparc/kernel/process.c')
-rw-r--r-- | arch/sparc/kernel/process.c | 709 |
1 files changed, 0 insertions, 709 deletions
diff --git a/arch/sparc/kernel/process.c b/arch/sparc/kernel/process.c deleted file mode 100644 index e8c43ffe317..00000000000 --- a/arch/sparc/kernel/process.c +++ /dev/null @@ -1,709 +0,0 @@ -/* linux/arch/sparc/kernel/process.c - * - * Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net) - * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be) - */ - -/* - * This file handles the architecture-dependent parts of process handling.. - */ - -#include <stdarg.h> - -#include <linux/errno.h> -#include <linux/module.h> -#include <linux/sched.h> -#include <linux/kernel.h> -#include <linux/mm.h> -#include <linux/stddef.h> -#include <linux/ptrace.h> -#include <linux/slab.h> -#include <linux/user.h> -#include <linux/smp.h> -#include <linux/reboot.h> -#include <linux/delay.h> -#include <linux/pm.h> -#include <linux/init.h> - -#include <asm/auxio.h> -#include <asm/oplib.h> -#include <asm/uaccess.h> -#include <asm/system.h> -#include <asm/page.h> -#include <asm/pgalloc.h> -#include <asm/pgtable.h> -#include <asm/delay.h> -#include <asm/processor.h> -#include <asm/psr.h> -#include <asm/elf.h> -#include <asm/prom.h> -#include <asm/unistd.h> - -/* - * Power management idle function - * Set in pm platform drivers (apc.c and pmc.c) - */ -void (*pm_idle)(void); - -/* - * Power-off handler instantiation for pm.h compliance - * This is done via auxio, but could be used as a fallback - * handler when auxio is not present-- unused for now... - */ -void (*pm_power_off)(void) = machine_power_off; -EXPORT_SYMBOL(pm_power_off); - -/* - * sysctl - toggle power-off restriction for serial console - * systems in machine_power_off() - */ -int scons_pwroff = 1; - -extern void fpsave(unsigned long *, unsigned long *, void *, unsigned long *); - -struct task_struct *last_task_used_math = NULL; -struct thread_info *current_set[NR_CPUS]; - -#ifndef CONFIG_SMP - -#define SUN4C_FAULT_HIGH 100 - -/* - * the idle loop on a Sparc... ;) - */ -void cpu_idle(void) -{ - /* endless idle loop with no priority at all */ - for (;;) { - if (ARCH_SUN4C) { - static int count = HZ; - static unsigned long last_jiffies; - static unsigned long last_faults; - static unsigned long fps; - unsigned long now; - unsigned long faults; - - extern unsigned long sun4c_kernel_faults; - extern void sun4c_grow_kernel_ring(void); - - local_irq_disable(); - now = jiffies; - count -= (now - last_jiffies); - last_jiffies = now; - if (count < 0) { - count += HZ; - faults = sun4c_kernel_faults; - fps = (fps + (faults - last_faults)) >> 1; - last_faults = faults; -#if 0 - printk("kernel faults / second = %ld\n", fps); -#endif - if (fps >= SUN4C_FAULT_HIGH) { - sun4c_grow_kernel_ring(); - } - } - local_irq_enable(); - } - - if (pm_idle) { - while (!need_resched()) - (*pm_idle)(); - } else { - while (!need_resched()) - cpu_relax(); - } - preempt_enable_no_resched(); - schedule(); - preempt_disable(); - check_pgt_cache(); - } -} - -#else - -/* This is being executed in task 0 'user space'. */ -void cpu_idle(void) -{ - set_thread_flag(TIF_POLLING_NRFLAG); - /* endless idle loop with no priority at all */ - while(1) { - while (!need_resched()) - cpu_relax(); - preempt_enable_no_resched(); - schedule(); - preempt_disable(); - check_pgt_cache(); - } -} - -#endif - -/* XXX cli/sti -> local_irq_xxx here, check this works once SMP is fixed. */ -void machine_halt(void) -{ - local_irq_enable(); - mdelay(8); - local_irq_disable(); - prom_halt(); - panic("Halt failed!"); -} - -void machine_restart(char * cmd) -{ - char *p; - - local_irq_enable(); - mdelay(8); - local_irq_disable(); - - p = strchr (reboot_command, '\n'); - if (p) *p = 0; - if (cmd) - prom_reboot(cmd); - if (*reboot_command) - prom_reboot(reboot_command); - prom_feval ("reset"); - panic("Reboot failed!"); -} - -void machine_power_off(void) -{ -#ifdef CONFIG_SUN_AUXIO - if (auxio_power_register && - (strcmp(of_console_device->type, "serial") || scons_pwroff)) - *auxio_power_register |= AUXIO_POWER_OFF; -#endif - machine_halt(); -} - -#if 0 - -static DEFINE_SPINLOCK(sparc_backtrace_lock); - -void __show_backtrace(unsigned long fp) -{ - struct reg_window *rw; - unsigned long flags; - int cpu = smp_processor_id(); - - spin_lock_irqsave(&sparc_backtrace_lock, flags); - - rw = (struct reg_window *)fp; - while(rw && (((unsigned long) rw) >= PAGE_OFFSET) && - !(((unsigned long) rw) & 0x7)) { - printk("CPU[%d]: ARGS[%08lx,%08lx,%08lx,%08lx,%08lx,%08lx] " - "FP[%08lx] CALLER[%08lx]: ", cpu, - rw->ins[0], rw->ins[1], rw->ins[2], rw->ins[3], - rw->ins[4], rw->ins[5], - rw->ins[6], - rw->ins[7]); - printk("%pS\n", (void *) rw->ins[7]); - rw = (struct reg_window *) rw->ins[6]; - } - spin_unlock_irqrestore(&sparc_backtrace_lock, flags); -} - -#define __SAVE __asm__ __volatile__("save %sp, -0x40, %sp\n\t") -#define __RESTORE __asm__ __volatile__("restore %g0, %g0, %g0\n\t") -#define __GET_FP(fp) __asm__ __volatile__("mov %%i6, %0" : "=r" (fp)) - -void show_backtrace(void) -{ - unsigned long fp; - - __SAVE; __SAVE; __SAVE; __SAVE; - __SAVE; __SAVE; __SAVE; __SAVE; - __RESTORE; __RESTORE; __RESTORE; __RESTORE; - __RESTORE; __RESTORE; __RESTORE; __RESTORE; - - __GET_FP(fp); - - __show_backtrace(fp); -} - -#ifdef CONFIG_SMP -void smp_show_backtrace_all_cpus(void) -{ - xc0((smpfunc_t) show_backtrace); - show_backtrace(); -} -#endif - -void show_stackframe(struct sparc_stackf *sf) -{ - unsigned long size; - unsigned long *stk; - int i; - - printk("l0: %08lx l1: %08lx l2: %08lx l3: %08lx " - "l4: %08lx l5: %08lx l6: %08lx l7: %08lx\n", - sf->locals[0], sf->locals[1], sf->locals[2], sf->locals[3], - sf->locals[4], sf->locals[5], sf->locals[6], sf->locals[7]); - printk("i0: %08lx i1: %08lx i2: %08lx i3: %08lx " - "i4: %08lx i5: %08lx fp: %08lx i7: %08lx\n", - sf->ins[0], sf->ins[1], sf->ins[2], sf->ins[3], - sf->ins[4], sf->ins[5], (unsigned long)sf->fp, sf->callers_pc); - printk("sp: %08lx x0: %08lx x1: %08lx x2: %08lx " - "x3: %08lx x4: %08lx x5: %08lx xx: %08lx\n", - (unsigned long)sf->structptr, sf->xargs[0], sf->xargs[1], - sf->xargs[2], sf->xargs[3], sf->xargs[4], sf->xargs[5], - sf->xxargs[0]); - size = ((unsigned long)sf->fp) - ((unsigned long)sf); - size -= STACKFRAME_SZ; - stk = (unsigned long *)((unsigned long)sf + STACKFRAME_SZ); - i = 0; - do { - printk("s%d: %08lx\n", i++, *stk++); - } while ((size -= sizeof(unsigned long))); -} -#endif - -void show_regs(struct pt_regs *r) -{ - struct reg_window *rw = (struct reg_window *) r->u_regs[14]; - - printk("PSR: %08lx PC: %08lx NPC: %08lx Y: %08lx %s\n", - r->psr, r->pc, r->npc, r->y, print_tainted()); - printk("PC: <%pS>\n", (void *) r->pc); - printk("%%G: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n", - r->u_regs[0], r->u_regs[1], r->u_regs[2], r->u_regs[3], - r->u_regs[4], r->u_regs[5], r->u_regs[6], r->u_regs[7]); - printk("%%O: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n", - r->u_regs[8], r->u_regs[9], r->u_regs[10], r->u_regs[11], - r->u_regs[12], r->u_regs[13], r->u_regs[14], r->u_regs[15]); - printk("RPC: <%pS>\n", (void *) r->u_regs[15]); - - printk("%%L: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n", - rw->locals[0], rw->locals[1], rw->locals[2], rw->locals[3], - rw->locals[4], rw->locals[5], rw->locals[6], rw->locals[7]); - printk("%%I: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n", - rw->ins[0], rw->ins[1], rw->ins[2], rw->ins[3], - rw->ins[4], rw->ins[5], rw->ins[6], rw->ins[7]); -} - -/* - * The show_stack is an external API which we do not use ourselves. - * The oops is printed in die_if_kernel. - */ -void show_stack(struct task_struct *tsk, unsigned long *_ksp) -{ - unsigned long pc, fp; - unsigned long task_base; - struct reg_window *rw; - int count = 0; - - if (tsk != NULL) - task_base = (unsigned long) task_stack_page(tsk); - else - task_base = (unsigned long) current_thread_info(); - - fp = (unsigned long) _ksp; - do { - /* Bogus frame pointer? */ - if (fp < (task_base + sizeof(struct thread_info)) || - fp >= (task_base + (PAGE_SIZE << 1))) - break; - rw = (struct reg_window *) fp; - pc = rw->ins[7]; - printk("[%08lx : ", pc); - printk("%pS ] ", (void *) pc); - fp = rw->ins[6]; - } while (++count < 16); - printk("\n"); -} - -void dump_stack(void) -{ - unsigned long *ksp; - - __asm__ __volatile__("mov %%fp, %0" - : "=r" (ksp)); - show_stack(current, ksp); -} - -EXPORT_SYMBOL(dump_stack); - -/* - * Note: sparc64 has a pretty intricated thread_saved_pc, check it out. - */ -unsigned long thread_saved_pc(struct task_struct *tsk) -{ - return task_thread_info(tsk)->kpc; -} - -/* - * Free current thread data structures etc.. - */ -void exit_thread(void) -{ -#ifndef CONFIG_SMP - if(last_task_used_math == current) { -#else - if (test_thread_flag(TIF_USEDFPU)) { -#endif - /* Keep process from leaving FPU in a bogon state. */ - put_psr(get_psr() | PSR_EF); - fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, - ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); -#ifndef CONFIG_SMP - last_task_used_math = NULL; -#else - clear_thread_flag(TIF_USEDFPU); -#endif - } -} - -void flush_thread(void) -{ - current_thread_info()->w_saved = 0; - -#ifndef CONFIG_SMP - if(last_task_used_math == current) { -#else - if (test_thread_flag(TIF_USEDFPU)) { -#endif - /* Clean the fpu. */ - put_psr(get_psr() | PSR_EF); - fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, - ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); -#ifndef CONFIG_SMP - last_task_used_math = NULL; -#else - clear_thread_flag(TIF_USEDFPU); -#endif - } - - /* Now, this task is no longer a kernel thread. */ - current->thread.current_ds = USER_DS; - if (current->thread.flags & SPARC_FLAG_KTHREAD) { - current->thread.flags &= ~SPARC_FLAG_KTHREAD; - - /* We must fixup kregs as well. */ - /* XXX This was not fixed for ti for a while, worked. Unused? */ - current->thread.kregs = (struct pt_regs *) - (task_stack_page(current) + (THREAD_SIZE - TRACEREG_SZ)); - } -} - -static inline struct sparc_stackf __user * -clone_stackframe(struct sparc_stackf __user *dst, - struct sparc_stackf __user *src) -{ - unsigned long size, fp; - struct sparc_stackf *tmp; - struct sparc_stackf __user *sp; - - if (get_user(tmp, &src->fp)) - return NULL; - - fp = (unsigned long) tmp; - size = (fp - ((unsigned long) src)); - fp = (unsigned long) dst; - sp = (struct sparc_stackf __user *)(fp - size); - - /* do_fork() grabs the parent semaphore, we must release it - * temporarily so we can build the child clone stack frame - * without deadlocking. - */ - if (__copy_user(sp, src, size)) - sp = NULL; - else if (put_user(fp, &sp->fp)) - sp = NULL; - - return sp; -} - -asmlinkage int sparc_do_fork(unsigned long clone_flags, - unsigned long stack_start, - struct pt_regs *regs, - unsigned long stack_size) -{ - unsigned long parent_tid_ptr, child_tid_ptr; - unsigned long orig_i1 = regs->u_regs[UREG_I1]; - long ret; - - parent_tid_ptr = regs->u_regs[UREG_I2]; - child_tid_ptr = regs->u_regs[UREG_I4]; - - ret = do_fork(clone_flags, stack_start, - regs, stack_size, - (int __user *) parent_tid_ptr, - (int __user *) child_tid_ptr); - - /* If we get an error and potentially restart the system - * call, we're screwed because copy_thread() clobbered - * the parent's %o1. So detect that case and restore it - * here. - */ - if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK) - regs->u_regs[UREG_I1] = orig_i1; - - return ret; -} - -/* Copy a Sparc thread. The fork() return value conventions - * under SunOS are nothing short of bletcherous: - * Parent --> %o0 == childs pid, %o1 == 0 - * Child --> %o0 == parents pid, %o1 == 1 - * - * NOTE: We have a separate fork kpsr/kwim because - * the parent could change these values between - * sys_fork invocation and when we reach here - * if the parent should sleep while trying to - * allocate the task_struct and kernel stack in - * do_fork(). - * XXX See comment above sys_vfork in sparc64. todo. - */ -extern void ret_from_fork(void); - -int copy_thread(int nr, unsigned long clone_flags, unsigned long sp, - unsigned long unused, - struct task_struct *p, struct pt_regs *regs) -{ - struct thread_info *ti = task_thread_info(p); - struct pt_regs *childregs; - char *new_stack; - -#ifndef CONFIG_SMP - if(last_task_used_math == current) { -#else - if (test_thread_flag(TIF_USEDFPU)) { -#endif - put_psr(get_psr() | PSR_EF); - fpsave(&p->thread.float_regs[0], &p->thread.fsr, - &p->thread.fpqueue[0], &p->thread.fpqdepth); -#ifdef CONFIG_SMP - clear_thread_flag(TIF_USEDFPU); -#endif - } - - /* - * p->thread_info new_stack childregs - * ! ! ! {if(PSR_PS) } - * V V (stk.fr.) V (pt_regs) { (stk.fr.) } - * +----- - - - - - ------+===========+============={+==========}+ - */ - new_stack = task_stack_page(p) + THREAD_SIZE; - if (regs->psr & PSR_PS) - new_stack -= STACKFRAME_SZ; - new_stack -= STACKFRAME_SZ + TRACEREG_SZ; - memcpy(new_stack, (char *)regs - STACKFRAME_SZ, STACKFRAME_SZ + TRACEREG_SZ); - childregs = (struct pt_regs *) (new_stack + STACKFRAME_SZ); - - /* - * A new process must start with interrupts closed in 2.5, - * because this is how Mingo's scheduler works (see schedule_tail - * and finish_arch_switch). If we do not do it, a timer interrupt hits - * before we unlock, attempts to re-take the rq->lock, and then we die. - * Thus, kpsr|=PSR_PIL. - */ - ti->ksp = (unsigned long) new_stack; - ti->kpc = (((unsigned long) ret_from_fork) - 0x8); - ti->kpsr = current->thread.fork_kpsr | PSR_PIL; - ti->kwim = current->thread.fork_kwim; - - if(regs->psr & PSR_PS) { - extern struct pt_regs fake_swapper_regs; - - p->thread.kregs = &fake_swapper_regs; - new_stack += STACKFRAME_SZ + TRACEREG_SZ; - childregs->u_regs[UREG_FP] = (unsigned long) new_stack; - p->thread.flags |= SPARC_FLAG_KTHREAD; - p->thread.current_ds = KERNEL_DS; - memcpy(new_stack, (void *)regs->u_regs[UREG_FP], STACKFRAME_SZ); - childregs->u_regs[UREG_G6] = (unsigned long) ti; - } else { - p->thread.kregs = childregs; - childregs->u_regs[UREG_FP] = sp; - p->thread.flags &= ~SPARC_FLAG_KTHREAD; - p->thread.current_ds = USER_DS; - - if (sp != regs->u_regs[UREG_FP]) { - struct sparc_stackf __user *childstack; - struct sparc_stackf __user *parentstack; - - /* - * This is a clone() call with supplied user stack. - * Set some valid stack frames to give to the child. - */ - childstack = (struct sparc_stackf __user *) - (sp & ~0x7UL); - parentstack = (struct sparc_stackf __user *) - regs->u_regs[UREG_FP]; - -#if 0 - printk("clone: parent stack:\n"); - show_stackframe(parentstack); -#endif - - childstack = clone_stackframe(childstack, parentstack); - if (!childstack) - return -EFAULT; - -#if 0 - printk("clone: child stack:\n"); - show_stackframe(childstack); -#endif - - childregs->u_regs[UREG_FP] = (unsigned long)childstack; - } - } - -#ifdef CONFIG_SMP - /* FPU must be disabled on SMP. */ - childregs->psr &= ~PSR_EF; -#endif - - /* Set the return value for the child. */ - childregs->u_regs[UREG_I0] = current->pid; - childregs->u_regs[UREG_I1] = 1; - - /* Set the return value for the parent. */ - regs->u_regs[UREG_I1] = 0; - - if (clone_flags & CLONE_SETTLS) - childregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3]; - - return 0; -} - -/* - * fill in the fpu structure for a core dump. - */ -int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs) -{ - if (used_math()) { - memset(fpregs, 0, sizeof(*fpregs)); - fpregs->pr_q_entrysize = 8; - return 1; - } -#ifdef CONFIG_SMP - if (test_thread_flag(TIF_USEDFPU)) { - put_psr(get_psr() | PSR_EF); - fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, - ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); - if (regs != NULL) { - regs->psr &= ~(PSR_EF); - clear_thread_flag(TIF_USEDFPU); - } - } -#else - if (current == last_task_used_math) { - put_psr(get_psr() | PSR_EF); - fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, - ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); - if (regs != NULL) { - regs->psr &= ~(PSR_EF); - last_task_used_math = NULL; - } - } -#endif - memcpy(&fpregs->pr_fr.pr_regs[0], - ¤t->thread.float_regs[0], - (sizeof(unsigned long) * 32)); - fpregs->pr_fsr = current->thread.fsr; - fpregs->pr_qcnt = current->thread.fpqdepth; - fpregs->pr_q_entrysize = 8; - fpregs->pr_en = 1; - if(fpregs->pr_qcnt != 0) { - memcpy(&fpregs->pr_q[0], - ¤t->thread.fpqueue[0], - sizeof(struct fpq) * fpregs->pr_qcnt); - } - /* Zero out the rest. */ - memset(&fpregs->pr_q[fpregs->pr_qcnt], 0, - sizeof(struct fpq) * (32 - fpregs->pr_qcnt)); - return 1; -} - -/* - * sparc_execve() executes a new program after the asm stub has set - * things up for us. This should basically do what I want it to. - */ -asmlinkage int sparc_execve(struct pt_regs *regs) -{ - int error, base = 0; - char *filename; - - /* Check for indirect call. */ - if(regs->u_regs[UREG_G1] == 0) - base = 1; - - filename = getname((char __user *)regs->u_regs[base + UREG_I0]); - error = PTR_ERR(filename); - if(IS_ERR(filename)) - goto out; - error = do_execve(filename, - (char __user * __user *)regs->u_regs[base + UREG_I1], - (char __user * __user *)regs->u_regs[base + UREG_I2], - regs); - putname(filename); -out: - return error; -} - -/* - * This is the mechanism for creating a new kernel thread. - * - * NOTE! Only a kernel-only process(ie the swapper or direct descendants - * who haven't done an "execve()") should use this: it will work within - * a system call from a "real" process, but the process memory space will - * not be freed until both the parent and the child have exited. - */ -pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) -{ - long retval; - - __asm__ __volatile__("mov %4, %%g2\n\t" /* Set aside fn ptr... */ - "mov %5, %%g3\n\t" /* and arg. */ - "mov %1, %%g1\n\t" - "mov %2, %%o0\n\t" /* Clone flags. */ - "mov 0, %%o1\n\t" /* usp arg == 0 */ - "t 0x10\n\t" /* Linux/Sparc clone(). */ - "cmp %%o1, 0\n\t" - "be 1f\n\t" /* The parent, just return. */ - " nop\n\t" /* Delay slot. */ - "jmpl %%g2, %%o7\n\t" /* Call the function. */ - " mov %%g3, %%o0\n\t" /* Get back the arg in delay. */ - "mov %3, %%g1\n\t" - "t 0x10\n\t" /* Linux/Sparc exit(). */ - /* Notreached by child. */ - "1: mov %%o0, %0\n\t" : - "=r" (retval) : - "i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED), - "i" (__NR_exit), "r" (fn), "r" (arg) : - "g1", "g2", "g3", "o0", "o1", "memory", "cc"); - return retval; -} - -unsigned long get_wchan(struct task_struct *task) -{ - unsigned long pc, fp, bias = 0; - unsigned long task_base = (unsigned long) task; - unsigned long ret = 0; - struct reg_window *rw; - int count = 0; - - if (!task || task == current || - task->state == TASK_RUNNING) - goto out; - - fp = task_thread_info(task)->ksp + bias; - do { - /* Bogus frame pointer? */ - if (fp < (task_base + sizeof(struct thread_info)) || - fp >= (task_base + (2 * PAGE_SIZE))) - break; - rw = (struct reg_window *) fp; - pc = rw->ins[7]; - if (!in_sched_functions(pc)) { - ret = pc; - goto out; - } - fp = rw->ins[6] + bias; - } while (++count < 16); - -out: - return ret; -} - |