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| 2 | |
| 3 |
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| 4 | #include <linux/module.h>
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| 5 | #include <linux/sched.h>
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| 6 | #include <linux/sched/task_stack.h>
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| 7 | #include <linux/sched/debug.h>
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| 8 | #include <linux/delay.h>
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| 9 | #include <linux/kallsyms.h>
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| 10 | #include <linux/uaccess.h>
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| 11 | #include <linux/ptrace.h>
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| 12 | #include <linux/elfcore.h>
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| 13 |
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| 14 | #include <asm/elf.h>
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| 15 | #include <abi/reg_ops.h>
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| 16 |
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| 17 | struct cpuinfo_csky cpu_data[NR_CPUS];
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| 18 |
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| 19 | #ifdef CONFIG_STACKPROTECTOR
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| 20 | #include <linux/stackprotector.h>
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| 21 | unsigned long __stack_chk_guard __read_mostly;
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| 22 | EXPORT_SYMBOL(__stack_chk_guard);
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| 23 | #endif
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| 24 |
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| 25 | asmlinkage void ret_from_fork(void);
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| 26 | asmlinkage void ret_from_kernel_thread(void);
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| 27 |
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| 28 | |
| 29 | * Some archs flush debug and FPU info here
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| 30 |
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| 31 | void flush_thread(void){}
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| 32 |
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| 33 | int copy_thread(struct task_struct *p, const struct kernel_clone_args *args)
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| 34 | {
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| 35 | u64 clone_flags = args->flags;
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| 36 | unsigned long usp = args->stack;
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| 37 | unsigned long tls = args->tls;
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| 38 | struct switch_stack *childstack;
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| 39 | struct pt_regs *childregs = task_pt_regs(p);
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| 40 |
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| 41 | #ifdef CONFIG_CPU_HAS_FPU
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| 42 | save_to_user_fp(&p->thread.user_fp);
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| 43 | #endif
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| 44 |
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| 45 | childstack = ((struct switch_stack *) childregs) - 1;
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| 46 | memset(childstack, 0, sizeof(struct switch_stack));
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| 47 |
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| 48 |
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| 49 | p->thread.sp = (unsigned long)childstack;
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| 50 |
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| 51 | if (unlikely(args->fn)) {
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| 52 | memset(childregs, 0, sizeof(struct pt_regs));
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| 53 | childstack->r15 = (unsigned long) ret_from_kernel_thread;
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| 54 | childstack->r10 = (unsigned long) args->fn_arg;
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| 55 | childstack->r9 = (unsigned long) args->fn;
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| 56 | childregs->sr = mfcr("psr");
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| 57 | } else {
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| 58 | *childregs = *(current_pt_regs());
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| 59 | if (usp)
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| 60 | childregs->usp = usp;
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| 61 | if (clone_flags & CLONE_SETTLS)
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| 62 | task_thread_info(p)->tp_value = childregs->tls
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| 63 | = tls;
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| 64 |
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| 65 | childregs->a0 = 0;
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| 66 | childstack->r15 = (unsigned long) ret_from_fork;
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| 67 | }
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| 68 |
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| 69 | return 0;
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| 70 | }
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| 71 |
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| 72 |
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| 73 | int elf_core_copy_task_fpregs(struct task_struct *t, elf_fpregset_t *fpu)
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| 74 | {
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| 75 | memcpy(fpu, ¤t->thread.user_fp, sizeof(*fpu));
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| 76 | return 1;
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| 77 | }
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| 78 |
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| 79 | int dump_task_regs(struct task_struct *tsk, elf_gregset_t *pr_regs)
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| 80 | {
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| 81 | struct pt_regs *regs = task_pt_regs(tsk);
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| 82 |
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| 83 |
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| 84 | ELF_CORE_COPY_REGS((*pr_regs), regs)
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| 85 |
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| 86 | return 1;
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| 87 | }
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| 88 |
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| 89 | #ifndef CONFIG_CPU_PM_NONE
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| 90 | void arch_cpu_idle(void)
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| 91 | {
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| 92 | #ifdef CONFIG_CPU_PM_WAIT
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| 93 | asm volatile("wait\n");
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| 94 | #endif
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| 95 |
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| 96 | #ifdef CONFIG_CPU_PM_DOZE
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| 97 | asm volatile("doze\n");
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| 98 | #endif
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| 99 |
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| 100 | #ifdef CONFIG_CPU_PM_STOP
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| 101 | asm volatile("stop\n");
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| 102 | #endif
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| 103 | }
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| 104 | #endif
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