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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 | // SPDX-License-Identifier: GPL-2.0 // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. #include <linux/module.h> #include <linux/version.h> #include <linux/sched.h> #include <linux/sched/task_stack.h> #include <linux/sched/debug.h> #include <linux/delay.h> #include <linux/kallsyms.h> #include <linux/uaccess.h> #include <linux/ptrace.h> #include <asm/elf.h> #include <abi/reg_ops.h> struct cpuinfo_csky cpu_data[NR_CPUS]; #ifdef CONFIG_STACKPROTECTOR #include <linux/stackprotector.h> unsigned long __stack_chk_guard __read_mostly; EXPORT_SYMBOL(__stack_chk_guard); #endif asmlinkage void ret_from_fork(void); asmlinkage void ret_from_kernel_thread(void); /* * Some archs flush debug and FPU info here */ void flush_thread(void){} int copy_thread(unsigned long clone_flags, unsigned long usp, unsigned long kthread_arg, struct task_struct *p, unsigned long tls) { struct switch_stack *childstack; struct pt_regs *childregs = task_pt_regs(p); #ifdef CONFIG_CPU_HAS_FPU save_to_user_fp(&p->thread.user_fp); #endif childstack = ((struct switch_stack *) childregs) - 1; memset(childstack, 0, sizeof(struct switch_stack)); /* setup thread.sp for switch_to !!! */ p->thread.sp = (unsigned long)childstack; if (unlikely(p->flags & PF_KTHREAD)) { memset(childregs, 0, sizeof(struct pt_regs)); childstack->r15 = (unsigned long) ret_from_kernel_thread; childstack->r10 = kthread_arg; childstack->r9 = usp; childregs->sr = mfcr("psr"); } else { *childregs = *(current_pt_regs()); if (usp) childregs->usp = usp; if (clone_flags & CLONE_SETTLS) task_thread_info(p)->tp_value = childregs->tls = tls; childregs->a0 = 0; childstack->r15 = (unsigned long) ret_from_fork; } return 0; } /* Fill in the fpu structure for a core dump. */ int dump_fpu(struct pt_regs *regs, struct user_fp *fpu) { memcpy(fpu, ¤t->thread.user_fp, sizeof(*fpu)); return 1; } EXPORT_SYMBOL(dump_fpu); int dump_task_regs(struct task_struct *tsk, elf_gregset_t *pr_regs) { struct pt_regs *regs = task_pt_regs(tsk); /* NOTE: usp is error value. */ ELF_CORE_COPY_REGS((*pr_regs), regs) return 1; } #ifndef CONFIG_CPU_PM_NONE void arch_cpu_idle(void) { #ifdef CONFIG_CPU_PM_WAIT asm volatile("wait\n"); #endif #ifdef CONFIG_CPU_PM_DOZE asm volatile("doze\n"); #endif #ifdef CONFIG_CPU_PM_STOP asm volatile("stop\n"); #endif raw_local_irq_enable(); } #endif |