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32 results

process.c

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  • process.c 3.64 KiB
    // SPDX-License-Identifier: GPL-2.0-or-later
    /*
     * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
     *  Chen Liqin <liqin.chen@sunplusct.com>
     *  Lennox Wu <lennox.wu@sunplusct.com>
     * Copyright (C) 2012 Regents of the University of California
     * Copyright (C) 2017 SiFive
     */
    
    #include <linux/kernel.h>
    #include <linux/sched.h>
    #include <linux/sched/task_stack.h>
    #include <linux/tick.h>
    #include <linux/ptrace.h>
    #include <linux/uaccess.h>
    
    #include <asm/unistd.h>
    #include <asm/processor.h>
    #include <asm/csr.h>
    #include <asm/string.h>
    #include <asm/switch_to.h>
    
    extern asmlinkage void ret_from_fork(void);
    extern asmlinkage void ret_from_kernel_thread(void);
    
    void arch_cpu_idle(void)
    {
    	wait_for_interrupt();
    	local_irq_enable();
    }
    
    void show_regs(struct pt_regs *regs)
    {
    	show_regs_print_info(KERN_DEFAULT);
    
    	pr_cont("sepc: " REG_FMT " ra : " REG_FMT " sp : " REG_FMT "\n",
    		regs->sepc, regs->ra, regs->sp);
    	pr_cont(" gp : " REG_FMT " tp : " REG_FMT " t0 : " REG_FMT "\n",
    		regs->gp, regs->tp, regs->t0);
    	pr_cont(" t1 : " REG_FMT " t2 : " REG_FMT " s0 : " REG_FMT "\n",
    		regs->t1, regs->t2, regs->s0);
    	pr_cont(" s1 : " REG_FMT " a0 : " REG_FMT " a1 : " REG_FMT "\n",
    		regs->s1, regs->a0, regs->a1);
    	pr_cont(" a2 : " REG_FMT " a3 : " REG_FMT " a4 : " REG_FMT "\n",
    		regs->a2, regs->a3, regs->a4);
    	pr_cont(" a5 : " REG_FMT " a6 : " REG_FMT " a7 : " REG_FMT "\n",
    		regs->a5, regs->a6, regs->a7);
    	pr_cont(" s2 : " REG_FMT " s3 : " REG_FMT " s4 : " REG_FMT "\n",
    		regs->s2, regs->s3, regs->s4);
    	pr_cont(" s5 : " REG_FMT " s6 : " REG_FMT " s7 : " REG_FMT "\n",
    		regs->s5, regs->s6, regs->s7);
    	pr_cont(" s8 : " REG_FMT " s9 : " REG_FMT " s10: " REG_FMT "\n",
    		regs->s8, regs->s9, regs->s10);
    	pr_cont(" s11: " REG_FMT " t3 : " REG_FMT " t4 : " REG_FMT "\n",
    		regs->s11, regs->t3, regs->t4);
    	pr_cont(" t5 : " REG_FMT " t6 : " REG_FMT "\n",
    		regs->t5, regs->t6);
    
    	pr_cont("sstatus: " REG_FMT " sbadaddr: " REG_FMT " scause: " REG_FMT "\n",
    		regs->sstatus, regs->sbadaddr, regs->scause);
    }
    
    void start_thread(struct pt_regs *regs, unsigned long pc,
    	unsigned long sp)
    {
    	regs->sstatus = SR_SPIE;
    	if (has_fpu) {
    		regs->sstatus |= SR_FS_INITIAL;
    		/*
    		 * Restore the initial value to the FP register
    		 * before starting the user program.
    		 */
    		fstate_restore(current, regs);
    	}
    	regs->sepc = pc;
    	regs->sp = sp;
    	set_fs(USER_DS);
    }
    
    void flush_thread(void)
    {
    #ifdef CONFIG_FPU
    	/*
    	 * Reset FPU state and context
    	 *	frm: round to nearest, ties to even (IEEE default)
    	 *	fflags: accrued exceptions cleared
    	 */
    	fstate_off(current, task_pt_regs(current));
    	memset(&current->thread.fstate, 0, sizeof(current->thread.fstate));
    #endif
    }
    
    int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
    {
    	fstate_save(src, task_pt_regs(src));
    	*dst = *src;
    	return 0;
    }
    
    int copy_thread(unsigned long clone_flags, unsigned long usp,
    	unsigned long arg, struct task_struct *p)
    {
    	struct pt_regs *childregs = task_pt_regs(p);
    
    	/* p->thread holds context to be restored by __switch_to() */
    	if (unlikely(p->flags & PF_KTHREAD)) {
    		/* Kernel thread */
    		const register unsigned long gp __asm__ ("gp");
    		memset(childregs, 0, sizeof(struct pt_regs));
    		childregs->gp = gp;
    		childregs->sstatus = SR_SPP | SR_SPIE; /* Supervisor, irqs on */
    
    		p->thread.ra = (unsigned long)ret_from_kernel_thread;
    		p->thread.s[0] = usp; /* fn */
    		p->thread.s[1] = arg;
    	} else {
    		*childregs = *(current_pt_regs());
    		if (usp) /* User fork */
    			childregs->sp = usp;
    		if (clone_flags & CLONE_SETTLS)
    			childregs->tp = childregs->a5;
    		childregs->a0 = 0; /* Return value of fork() */
    		p->thread.ra = (unsigned long)ret_from_fork;
    	}
    	p->thread.sp = (unsigned long)childregs; /* kernel sp */
    	return 0;
    }