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- /* 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/elfcore.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/user.h>
- #include <linux/smp.h>
- #include <linux/reboot.h>
- #include <linux/delay.h>
- #include <linux/pm.h>
- #include <linux/slab.h>
- #include <linux/cpu.h>
- #include <asm/auxio.h>
- #include <asm/oplib.h>
- #include <asm/uaccess.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>
- #include <asm/setup.h>
- #include "kernel.h"
- /*
- * Power management idle function
- * Set in pm platform drivers (apc.c and pmc.c)
- */
- void (*sparc_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];
- /* Idle loop support. */
- void arch_cpu_idle(void)
- {
- if (sparc_idle)
- (*sparc_idle)();
- local_irq_enable();
- }
- /* 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)
- {
- if (auxio_power_register &&
- (strcmp(of_console_device->type, "serial") || scons_pwroff)) {
- u8 power_register = sbus_readb(auxio_power_register);
- power_register |= AUXIO_POWER_OFF;
- sbus_writeb(power_register, auxio_power_register);
- }
- machine_halt();
- }
- void show_regs(struct pt_regs *r)
- {
- struct reg_window32 *rw = (struct reg_window32 *) r->u_regs[14];
- show_regs_print_info(KERN_DEFAULT);
- 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_window32 *rw;
- int count = 0;
- if (!tsk)
- tsk = current;
- if (tsk == current && !_ksp)
- __asm__ __volatile__("mov %%fp, %0" : "=r" (_ksp));
- task_base = (unsigned long) task_stack_page(tsk);
- 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_window32 *) fp;
- pc = rw->ins[7];
- printk("[%08lx : ", pc);
- printk("%pS ] ", (void *) pc);
- fp = rw->ins[6];
- } while (++count < 16);
- printk("\n");
- }
- /*
- * 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(struct task_struct *tsk)
- {
- #ifndef CONFIG_SMP
- if (last_task_used_math == tsk) {
- #else
- if (test_ti_thread_flag(task_thread_info(tsk), TIF_USEDFPU)) {
- #endif
- /* Keep process from leaving FPU in a bogon state. */
- put_psr(get_psr() | PSR_EF);
- fpsave(&tsk->thread.float_regs[0], &tsk->thread.fsr,
- &tsk->thread.fpqueue[0], &tsk->thread.fpqdepth);
- #ifndef CONFIG_SMP
- last_task_used_math = NULL;
- #else
- clear_ti_thread_flag(task_thread_info(tsk), 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
- }
- /* This task is no longer a kernel thread. */
- 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, 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);
- extern void ret_from_kernel_thread(void);
- int copy_thread(unsigned long clone_flags, unsigned long sp,
- unsigned long arg, struct task_struct *p)
- {
- struct thread_info *ti = task_thread_info(p);
- struct pt_regs *childregs, *regs = current_pt_regs();
- 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);
- }
- /*
- * p->thread_info new_stack childregs stack bottom
- * ! ! ! !
- * V V (stk.fr.) V (pt_regs) V
- * +----- - - - - - ------+===========+=============+
- */
- new_stack = task_stack_page(p) + THREAD_SIZE;
- new_stack -= STACKFRAME_SZ + TRACEREG_SZ;
- childregs = (struct pt_regs *) (new_stack + STACKFRAME_SZ);
- /*
- * A new process must start with interrupts disabled, see schedule_tail()
- * and finish_task_switch(). (If we do not do it and if a timer interrupt
- * hits before we unlock and attempts to take the rq->lock, we deadlock.)
- *
- * Thus, kpsr |= PSR_PIL.
- */
- ti->ksp = (unsigned long) new_stack;
- p->thread.kregs = childregs;
- if (unlikely(p->flags & PF_KTHREAD)) {
- extern int nwindows;
- unsigned long psr;
- memset(new_stack, 0, STACKFRAME_SZ + TRACEREG_SZ);
- p->thread.flags |= SPARC_FLAG_KTHREAD;
- p->thread.current_ds = KERNEL_DS;
- ti->kpc = (((unsigned long) ret_from_kernel_thread) - 0x8);
- childregs->u_regs[UREG_G1] = sp; /* function */
- childregs->u_regs[UREG_G2] = arg;
- psr = childregs->psr = get_psr();
- ti->kpsr = psr | PSR_PIL;
- ti->kwim = 1 << (((psr & PSR_CWP) + 1) % nwindows);
- return 0;
- }
- memcpy(new_stack, (char *)regs - STACKFRAME_SZ, STACKFRAME_SZ + TRACEREG_SZ);
- childregs->u_regs[UREG_FP] = sp;
- p->thread.flags &= ~SPARC_FLAG_KTHREAD;
- p->thread.current_ds = USER_DS;
- ti->kpc = (((unsigned long) ret_from_fork) - 0x8);
- ti->kpsr = current->thread.fork_kpsr | PSR_PIL;
- ti->kwim = current->thread.fork_kwim;
- 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 & ~0xfUL);
- 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;
- clear_tsk_thread_flag(p, TIF_USEDFPU);
- #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;
- }
- 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_window32 *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_window32 *) 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;
- }
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