/* $Id: process.c,v 1.161 2002/01/23 11:27:32 davem Exp $ * linux/arch/sparc/kernel/process.c * * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) * 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/kallsyms.h>#include <linux/mm.h>#include <linux/stddef.h>#include <linux/ptrace.h>#include <linux/slab.h>#include <linux/user.h>#include <linux/a.out.h>#include <linux/smp.h>#include <linux/smp_lock.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/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_SUN4) { 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 extern char reboot_command []; extern void (*prom_palette)(int); /* 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(); if (!serial_console && prom_palette) prom_palette (1); 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 (!serial_console && prom_palette) prom_palette (1); 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 && (!serial_console || scons_pwroff)) *auxio_power_register |= AUXIO_POWER_OFF;#endif machine_halt();} 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]); print_symbol("%s\n", 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_SMPvoid smp_show_backtrace_all_cpus(void){ xc0((smpfunc_t) show_backtrace); show_backtrace();}#endif #if 0void 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()); print_symbol("PC: <%s>\n", 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]); print_symbol("RPC: <%s>\n", 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); print_symbol("%s ] ", 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; /* No new signal delivery by default */ current->thread.new_signal = 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; parent_tid_ptr = regs->u_regs[UREG_I2]; child_tid_ptr = regs->u_regs[UREG_I4]; return do_fork(clone_flags, stack_start, regs, stack_size, (int __user *) parent_tid_ptr, (int __user *) child_tid_ptr);} /* 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);Lines 1–500 of 745. Load more
/* $Id: process.c,v 1.161 2002/01/23 11:27:32 davem Exp $ * linux/arch/sparc/kernel/process.c * * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) * 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/kallsyms.h> #include <linux/mm.h> #include <linux/stddef.h> #include <linux/ptrace.h> #include <linux/slab.h> #include <linux/user.h> #include <linux/a.out.h> #include <linux/smp.h> #include <linux/smp_lock.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/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_SUN4) { 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 extern char reboot_command []; extern void (*prom_palette)(int); /* 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(); if (!serial_console && prom_palette) prom_palette (1); 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 (!serial_console && prom_palette) prom_palette (1); 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 && (!serial_console || scons_pwroff)) *auxio_power_register |= AUXIO_POWER_OFF; #endif machine_halt(); } 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]); print_symbol("%s\n", 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 #if 0 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()); print_symbol("PC: <%s>\n", 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]); print_symbol("RPC: <%s>\n", 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); print_symbol("%s ] ", 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; /* No new signal delivery by default */ current->thread.new_signal = 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; parent_tid_ptr = regs->u_regs[UREG_I2]; child_tid_ptr = regs->u_regs[UREG_I4]; return do_fork(clone_flags, stack_start, regs, stack_size, (int __user *) parent_tid_ptr, (int __user *) child_tid_ptr); } /* 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);