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149 lines
4.2 KiB
149 lines
4.2 KiB
// 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 <[email protected]> |
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* Lennox Wu <[email protected]> |
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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/cpu.h> |
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#include <linux/kernel.h> |
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#include <linux/sched.h> |
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#include <linux/sched/debug.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/stacktrace.h> |
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#include <asm/string.h> |
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#include <asm/switch_to.h> |
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#include <asm/thread_info.h> |
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register unsigned long gp_in_global __asm__("gp"); |
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#if defined(CONFIG_STACKPROTECTOR) && !defined(CONFIG_STACKPROTECTOR_PER_TASK) |
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#include <linux/stackprotector.h> |
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unsigned long __stack_chk_guard __read_mostly; |
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EXPORT_SYMBOL(__stack_chk_guard); |
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#endif |
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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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raw_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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if (!user_mode(regs)) { |
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pr_cont("epc : %pS\n", (void *)regs->epc); |
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pr_cont(" ra : %pS\n", (void *)regs->ra); |
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} |
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pr_cont("epc : " REG_FMT " ra : " REG_FMT " sp : " REG_FMT "\n", |
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regs->epc, 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("status: " REG_FMT " badaddr: " REG_FMT " cause: " REG_FMT "\n", |
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regs->status, regs->badaddr, regs->cause); |
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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(regs); |
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if (!user_mode(regs)) |
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dump_backtrace(regs, NULL, KERN_DEFAULT); |
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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->status = SR_PIE; |
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if (has_fpu) { |
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regs->status |= SR_FS_INITIAL; |
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/* |
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* Restore the initial value to the FP register |
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* before starting the user program. |
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*/ |
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fstate_restore(current, regs); |
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} |
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regs->epc = pc; |
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regs->sp = sp; |
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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 state and 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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fstate_off(current, task_pt_regs(current)); |
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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, unsigned long arg, |
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struct task_struct *p, unsigned long tls) |
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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 | PF_IO_WORKER))) { |
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/* Kernel thread */ |
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memset(childregs, 0, sizeof(struct pt_regs)); |
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childregs->gp = gp_in_global; |
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/* Supervisor/Machine, irqs on: */ |
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childregs->status = SR_PP | SR_PIE; |
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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 = tls; |
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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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