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linux
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process.c
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/* * linux/arch/m68k/kernel/process.c * * Copyright (C) 1995 Hamish Macdonald * * 68060 fixes by Jesper Skov */ /* * This file handles the architecture-dependent parts of process handling.. */ #include <linux/errno.h> #include <linux/module.h> #include <linux/sched.h> #include <linux/kernel.h> #include <linux/mm.h> #include <linux/slab.h> #include <linux/fs.h> #include <linux/smp.h> #include <linux/stddef.h> #include <linux/unistd.h> #include <linux/ptrace.h> #include <linux/user.h> #include <linux/reboot.h> #include <linux/init_task.h> #include <linux/mqueue.h> #include <linux/rcupdate.h> #include <asm/uaccess.h> #include <asm/traps.h> #include <asm/machdep.h> #include <asm/setup.h> #include <asm/pgtable.h> asmlinkage void ret_from_fork(void); asmlinkage void ret_from_kernel_thread(void); /* * Return saved PC from a blocked thread */ unsigned long thread_saved_pc(struct task_struct *tsk) { struct switch_stack *sw = (struct switch_stack *)tsk->thread.ksp; /* Check whether the thread is blocked in resume() */ if (in_sched_functions(sw->retpc)) return ((unsigned long *)sw->a6)[1]; else return sw->retpc; } void arch_cpu_idle(void) { #if defined(MACH_ATARI_ONLY) /* block out HSYNC on the atari (falcon) */ __asm__("stop #0x2200" : : : "cc"); #else __asm__("stop #0x2000" : : : "cc"); #endif } void machine_restart(char * __unused) { if (mach_reset) mach_reset(); for (;;); } void machine_halt(void) { if (mach_halt) mach_halt(); for (;;); } void machine_power_off(void) { if (mach_power_off) mach_power_off(); for (;;); } void (*pm_power_off)(void) = machine_power_off; EXPORT_SYMBOL(pm_power_off); void show_regs(struct pt_regs * regs) { printk("\n"); printk("Format %02x Vector: %04x PC: %08lx Status: %04x %s\n", regs->format, regs->vector, regs->pc, regs->sr, print_tainted()); printk("ORIG_D0: %08lx D0: %08lx A2: %08lx A1: %08lx\n", regs->orig_d0, regs->d0, regs->a2, regs->a1); printk("A0: %08lx D5: %08lx D4: %08lx\n", regs->a0, regs->d5, regs->d4); printk("D3: %08lx D2: %08lx D1: %08lx\n", regs->d3, regs->d2, regs->d1); if (!(regs->sr & PS_S)) printk("USP: %08lx\n", rdusp()); } void flush_thread(void) { current->thread.fs = __USER_DS; #ifdef CONFIG_FPU if (!FPU_IS_EMU) { unsigned long zero = 0; asm volatile("frestore %0": :"m" (zero)); } #endif } /* * Why not generic sys_clone, you ask? m68k passes all arguments on stack. * And we need all registers saved, which means a bunch of stuff pushed * on top of pt_regs, which means that sys_clone() arguments would be * buried. We could, of course, copy them, but it's too costly for no * good reason - generic clone() would have to copy them *again* for * do_fork() anyway. So in this case it's actually better to pass pt_regs * * and extract arguments for do_fork() from there. Eventually we might * go for calling do_fork() directly from the wrapper, but only after we * are finished with do_fork() prototype conversion. */ asmlinkage int m68k_clone(struct pt_regs *regs) { /* regs will be equal to current_pt_regs() */ return do_fork(regs->d1, regs->d2, 0, (int __user *)regs->d3, (int __user *)regs->d4); } int copy_thread(unsigned long clone_flags, unsigned long usp, unsigned long arg, struct task_struct *p) { struct fork_frame { struct switch_stack sw; struct pt_regs regs; } *frame; frame = (struct fork_frame *) (task_stack_page(p) + THREAD_SIZE) - 1; p->thread.ksp = (unsigned long)frame; p->thread.esp0 = (unsigned long)&frame->regs; /* * Must save the current SFC/DFC value, NOT the value when * the parent was last descheduled - RGH 10-08-96 */ p->thread.fs = get_fs().seg; if (unlikely(p->flags & PF_KTHREAD)) { /* kernel thread */ memset(frame, 0, sizeof(struct fork_frame)); frame->regs.sr = PS_S; frame->sw.a3 = usp; /* function */ frame->sw.d7 = arg; frame->sw.retpc = (unsigned long)ret_from_kernel_thread; p->thread.usp = 0; return 0; } memcpy(frame, container_of(current_pt_regs(), struct fork_frame, regs), sizeof(struct fork_frame)); frame->regs.d0 = 0; frame->sw.retpc = (unsigned long)ret_from_fork; p->thread.usp = usp ?: rdusp(); if (clone_flags & CLONE_SETTLS) task_thread_info(p)->tp_value = frame->regs.d5; #ifdef CONFIG_FPU if (!FPU_IS_EMU) { /* Copy the current fpu state */ asm volatile ("fsave %0" : : "m" (p->thread.fpstate[0]) : "memory"); if (!CPU_IS_060 ? p->thread.fpstate[0] : p->thread.fpstate[2]) { if (CPU_IS_COLDFIRE) { asm volatile ("fmovemd %/fp0-%/fp7,%0\n\t" "fmovel %/fpiar,%1\n\t" "fmovel %/fpcr,%2\n\t" "fmovel %/fpsr,%3" : : "m" (p->thread.fp[0]), "m" (p->thread.fpcntl[0]), "m" (p->thread.fpcntl[1]), "m" (p->thread.fpcntl[2]) : "memory"); } else { asm volatile ("fmovemx %/fp0-%/fp7,%0\n\t" "fmoveml %/fpiar/%/fpcr/%/fpsr,%1" : : "m" (p->thread.fp[0]), "m" (p->thread.fpcntl[0]) : "memory"); } } /* Restore the state in case the fpu was busy */ asm volatile ("frestore %0" : : "m" (p->thread.fpstate[0])); } #endif /* CONFIG_FPU */ return 0; } /* Fill in the fpu structure for a core dump. */ #ifdef CONFIG_FPU int dump_fpu (struct pt_regs *regs, struct user_m68kfp_struct *fpu) { char fpustate[216]; if (FPU_IS_EMU) { int i; memcpy(fpu->fpcntl, current->thread.fpcntl, 12); memcpy(fpu->fpregs, current->thread.fp, 96); /* Convert internal fpu reg representation * into long double format */ for (i = 0; i < 24; i += 3) fpu->fpregs[i] = ((fpu->fpregs[i] & 0xffff0000) << 15) | ((fpu->fpregs[i] & 0x0000ffff) << 16); return 1; } /* First dump the fpu context to avoid protocol violation. */ asm volatile ("fsave %0" :: "m" (fpustate[0]) : "memory"); if (!CPU_IS_060 ? !fpustate[0] : !fpustate[2]) return 0; if (CPU_IS_COLDFIRE) { asm volatile ("fmovel %/fpiar,%0\n\t" "fmovel %/fpcr,%1\n\t" "fmovel %/fpsr,%2\n\t" "fmovemd %/fp0-%/fp7,%3" : : "m" (fpu->fpcntl[0]), "m" (fpu->fpcntl[1]), "m" (fpu->fpcntl[2]), "m" (fpu->fpregs[0]) : "memory"); } else { asm volatile ("fmovem %/fpiar/%/fpcr/%/fpsr,%0" : : "m" (fpu->fpcntl[0]) : "memory"); asm volatile ("fmovemx %/fp0-%/fp7,%0" : : "m" (fpu->fpregs[0]) : "memory"); } return 1; } EXPORT_SYMBOL(dump_fpu); #endif /* CONFIG_FPU */ unsigned long get_wchan(struct task_struct *p) { unsigned long fp, pc; unsigned long stack_page; int count = 0; if (!p || p == current || p->state == TASK_RUNNING) return 0; stack_page = (unsigned long)task_stack_page(p); fp = ((struct switch_stack *)p->thread.ksp)->a6; do { if (fp < stack_page+sizeof(struct thread_info) || fp >= 8184+stack_page) return 0; pc = ((unsigned long *)fp)[1]; if (!in_sched_functions(pc)) return pc; fp = *(unsigned long *) fp; } while (count++ < 16); return 0; }
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