projects / thirdparty / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| e9564df7 GR |
1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. | |
| 3 | ||
| 4 | #include <linux/module.h> | |
| 5 | #include <linux/version.h> | |
| 6 | #include <linux/sched.h> | |
| 7 | #include <linux/sched/task_stack.h> | |
| 8 | #include <linux/sched/debug.h> | |
| 9 | #include <linux/delay.h> | |
| 10 | #include <linux/kallsyms.h> | |
| 11 | #include <linux/uaccess.h> | |
| 12 | #include <linux/ptrace.h> | |
| 13 | ||
| 14 | #include <asm/elf.h> | |
| 15 | #include <abi/reg_ops.h> | |
| 16 | ||
| 17 | struct cpuinfo_csky cpu_data[NR_CPUS]; | |
| 18 | ||
| 2f78c73f MH |
19 | #ifdef CONFIG_STACKPROTECTOR |
| 20 | #include <linux/stackprotector.h> | |
| 21 | unsigned long __stack_chk_guard __read_mostly; | |
| 22 | EXPORT_SYMBOL(__stack_chk_guard); | |
| 23 | #endif | |
| 24 | ||
| e9564df7 GR |
25 | asmlinkage void ret_from_fork(void); |
| 26 | asmlinkage void ret_from_kernel_thread(void); | |
| 27 | ||
| 28 | /* | |
| 29 | * Some archs flush debug and FPU info here | |
| 30 | */ | |
| 31 | void flush_thread(void){} | |
| 32 | ||
| 33 | /* | |
| 34 | * Return saved PC from a blocked thread | |
| 35 | */ | |
| 36 | unsigned long thread_saved_pc(struct task_struct *tsk) | |
| 37 | { | |
| 67002814 | 38 | struct switch_stack *sw = (struct switch_stack *)tsk->thread.sp; |
| e9564df7 GR |
39 | |
| 40 | return sw->r15; | |
| 41 | } | |
| 42 | ||
| 0b9f386c | 43 | int copy_thread_tls(unsigned long clone_flags, |
| e9564df7 GR |
44 | unsigned long usp, |
| 45 | unsigned long kthread_arg, | |
| 0b9f386c GR |
46 | struct task_struct *p, |
| 47 | unsigned long tls) | |
| e9564df7 GR |
48 | { |
| 49 | struct switch_stack *childstack; | |
| 50 | struct pt_regs *childregs = task_pt_regs(p); | |
| 51 | ||
| 52 | #ifdef CONFIG_CPU_HAS_FPU | |
| 53 | save_to_user_fp(&p->thread.user_fp); | |
| 54 | #endif | |
| 55 | ||
| 56 | childstack = ((struct switch_stack *) childregs) - 1; | |
| 57 | memset(childstack, 0, sizeof(struct switch_stack)); | |
| 58 | ||
| 67002814 GR |
59 | /* setup thread.sp for switch_to !!! */ |
| 60 | p->thread.sp = (unsigned long)childstack; | |
| e9564df7 GR |
61 | |
| 62 | if (unlikely(p->flags & PF_KTHREAD)) { | |
| 63 | memset(childregs, 0, sizeof(struct pt_regs)); | |
| 64 | childstack->r15 = (unsigned long) ret_from_kernel_thread; | |
| 48ede51f | 65 | childstack->r10 = kthread_arg; |
| e9564df7 GR |
66 | childstack->r9 = usp; |
| 67 | childregs->sr = mfcr("psr"); | |
| 68 | } else { | |
| 69 | *childregs = *(current_pt_regs()); | |
| 70 | if (usp) | |
| 71 | childregs->usp = usp; | |
| 72 | if (clone_flags & CLONE_SETTLS) | |
| 73 | task_thread_info(p)->tp_value = childregs->tls | |
| 0b9f386c | 74 | = tls; |
| e9564df7 GR |
75 | |
| 76 | childregs->a0 = 0; | |
| 77 | childstack->r15 = (unsigned long) ret_from_fork; | |
| 78 | } | |
| 79 | ||
| 80 | return 0; | |
| 81 | } | |
| 82 | ||
| 83 | /* Fill in the fpu structure for a core dump. */ | |
| 84 | int dump_fpu(struct pt_regs *regs, struct user_fp *fpu) | |
| 85 | { | |
| 86 | memcpy(fpu, ¤t->thread.user_fp, sizeof(*fpu)); | |
| 87 | return 1; | |
| 88 | } | |
| 89 | EXPORT_SYMBOL(dump_fpu); | |
| 90 | ||
| 91 | int dump_task_regs(struct task_struct *tsk, elf_gregset_t *pr_regs) | |
| 92 | { | |
| 93 | struct pt_regs *regs = task_pt_regs(tsk); | |
| 94 | ||
| 95 | /* NOTE: usp is error value. */ | |
| 96 | ELF_CORE_COPY_REGS((*pr_regs), regs) | |
| 97 | ||
| 98 | return 1; | |
| 99 | } | |
| 100 | ||
| e9564df7 GR |
101 | #ifndef CONFIG_CPU_PM_NONE |
| 102 | void arch_cpu_idle(void) | |
| 103 | { | |
| 104 | #ifdef CONFIG_CPU_PM_WAIT | |
| 105 | asm volatile("wait\n"); | |
| 106 | #endif | |
| 107 | ||
| 108 | #ifdef CONFIG_CPU_PM_DOZE | |
| 109 | asm volatile("doze\n"); | |
| 110 | #endif | |
| 111 | ||
| 112 | #ifdef CONFIG_CPU_PM_STOP | |
| 113 | asm volatile("stop\n"); | |
| 114 | #endif | |
| 115 | local_irq_enable(); | |
| 116 | } | |
| 117 | #endif |