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Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not see the file copying or write to the free software foundation inc extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 12 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190523091651.231300438@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
121 lines
3.4 KiB
C
121 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
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* Chen Liqin <liqin.chen@sunplusct.com>
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* Lennox Wu <lennox.wu@sunplusct.com>
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* Copyright (C) 2012 Regents of the University of California
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* Copyright (C) 2017 SiFive
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*/
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/sched/task_stack.h>
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#include <linux/tick.h>
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#include <linux/ptrace.h>
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#include <linux/uaccess.h>
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#include <asm/unistd.h>
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#include <asm/processor.h>
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#include <asm/csr.h>
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#include <asm/string.h>
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#include <asm/switch_to.h>
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extern asmlinkage void ret_from_fork(void);
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extern asmlinkage void ret_from_kernel_thread(void);
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void arch_cpu_idle(void)
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{
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wait_for_interrupt();
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local_irq_enable();
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}
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void show_regs(struct pt_regs *regs)
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{
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show_regs_print_info(KERN_DEFAULT);
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pr_cont("sepc: " REG_FMT " ra : " REG_FMT " sp : " REG_FMT "\n",
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regs->sepc, regs->ra, regs->sp);
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pr_cont(" gp : " REG_FMT " tp : " REG_FMT " t0 : " REG_FMT "\n",
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regs->gp, regs->tp, regs->t0);
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pr_cont(" t1 : " REG_FMT " t2 : " REG_FMT " s0 : " REG_FMT "\n",
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regs->t1, regs->t2, regs->s0);
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pr_cont(" s1 : " REG_FMT " a0 : " REG_FMT " a1 : " REG_FMT "\n",
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regs->s1, regs->a0, regs->a1);
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pr_cont(" a2 : " REG_FMT " a3 : " REG_FMT " a4 : " REG_FMT "\n",
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regs->a2, regs->a3, regs->a4);
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pr_cont(" a5 : " REG_FMT " a6 : " REG_FMT " a7 : " REG_FMT "\n",
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regs->a5, regs->a6, regs->a7);
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pr_cont(" s2 : " REG_FMT " s3 : " REG_FMT " s4 : " REG_FMT "\n",
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regs->s2, regs->s3, regs->s4);
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pr_cont(" s5 : " REG_FMT " s6 : " REG_FMT " s7 : " REG_FMT "\n",
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regs->s5, regs->s6, regs->s7);
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pr_cont(" s8 : " REG_FMT " s9 : " REG_FMT " s10: " REG_FMT "\n",
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regs->s8, regs->s9, regs->s10);
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pr_cont(" s11: " REG_FMT " t3 : " REG_FMT " t4 : " REG_FMT "\n",
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regs->s11, regs->t3, regs->t4);
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pr_cont(" t5 : " REG_FMT " t6 : " REG_FMT "\n",
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regs->t5, regs->t6);
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pr_cont("sstatus: " REG_FMT " sbadaddr: " REG_FMT " scause: " REG_FMT "\n",
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regs->sstatus, regs->sbadaddr, regs->scause);
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}
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void start_thread(struct pt_regs *regs, unsigned long pc,
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unsigned long sp)
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{
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regs->sstatus = SR_SPIE;
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if (has_fpu)
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regs->sstatus |= SR_FS_INITIAL;
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regs->sepc = pc;
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regs->sp = sp;
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set_fs(USER_DS);
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}
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void flush_thread(void)
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{
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#ifdef CONFIG_FPU
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/*
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* Reset FPU context
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* frm: round to nearest, ties to even (IEEE default)
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* fflags: accrued exceptions cleared
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*/
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memset(¤t->thread.fstate, 0, sizeof(current->thread.fstate));
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#endif
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}
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int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
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{
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fstate_save(src, task_pt_regs(src));
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*dst = *src;
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return 0;
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}
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int copy_thread(unsigned long clone_flags, unsigned long usp,
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unsigned long arg, struct task_struct *p)
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{
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struct pt_regs *childregs = task_pt_regs(p);
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/* p->thread holds context to be restored by __switch_to() */
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if (unlikely(p->flags & PF_KTHREAD)) {
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/* Kernel thread */
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const register unsigned long gp __asm__ ("gp");
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memset(childregs, 0, sizeof(struct pt_regs));
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childregs->gp = gp;
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childregs->sstatus = SR_SPP | SR_SPIE; /* Supervisor, irqs on */
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p->thread.ra = (unsigned long)ret_from_kernel_thread;
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p->thread.s[0] = usp; /* fn */
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p->thread.s[1] = arg;
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} else {
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*childregs = *(current_pt_regs());
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if (usp) /* User fork */
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childregs->sp = usp;
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if (clone_flags & CLONE_SETTLS)
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childregs->tp = childregs->a5;
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childregs->a0 = 0; /* Return value of fork() */
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p->thread.ra = (unsigned long)ret_from_fork;
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}
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p->thread.sp = (unsigned long)childregs; /* kernel sp */
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return 0;
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}
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