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588cb88c | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
7db91e57 PD |
2 | /* |
3 | * Copyright (C) 2009 Sunplus Core Technology Co., Ltd. | |
4 | * Chen Liqin <liqin.chen@sunplusct.com> | |
5 | * Lennox Wu <lennox.wu@sunplusct.com> | |
6 | * Copyright (C) 2012 Regents of the University of California | |
7 | * Copyright (C) 2017 SiFive | |
7db91e57 PD |
8 | */ |
9 | ||
5ed881bc | 10 | #include <linux/cpu.h> |
7db91e57 PD |
11 | #include <linux/kernel.h> |
12 | #include <linux/sched.h> | |
13 | #include <linux/sched/task_stack.h> | |
14 | #include <linux/tick.h> | |
15 | #include <linux/ptrace.h> | |
5e454b54 | 16 | #include <linux/uaccess.h> |
7db91e57 PD |
17 | |
18 | #include <asm/unistd.h> | |
7db91e57 PD |
19 | #include <asm/processor.h> |
20 | #include <asm/csr.h> | |
21 | #include <asm/string.h> | |
22 | #include <asm/switch_to.h> | |
5ed881bc | 23 | #include <asm/thread_info.h> |
7db91e57 | 24 | |
8356c379 | 25 | register unsigned long gp_in_global __asm__("gp"); |
52e7c52d | 26 | |
7db91e57 PD |
27 | extern asmlinkage void ret_from_fork(void); |
28 | extern asmlinkage void ret_from_kernel_thread(void); | |
29 | ||
30 | void arch_cpu_idle(void) | |
31 | { | |
32 | wait_for_interrupt(); | |
33 | local_irq_enable(); | |
34 | } | |
35 | ||
36 | void show_regs(struct pt_regs *regs) | |
37 | { | |
38 | show_regs_print_info(KERN_DEFAULT); | |
39 | ||
a4c3733d CH |
40 | pr_cont("epc: " REG_FMT " ra : " REG_FMT " sp : " REG_FMT "\n", |
41 | regs->epc, regs->ra, regs->sp); | |
7db91e57 PD |
42 | pr_cont(" gp : " REG_FMT " tp : " REG_FMT " t0 : " REG_FMT "\n", |
43 | regs->gp, regs->tp, regs->t0); | |
44 | pr_cont(" t1 : " REG_FMT " t2 : " REG_FMT " s0 : " REG_FMT "\n", | |
45 | regs->t1, regs->t2, regs->s0); | |
46 | pr_cont(" s1 : " REG_FMT " a0 : " REG_FMT " a1 : " REG_FMT "\n", | |
47 | regs->s1, regs->a0, regs->a1); | |
48 | pr_cont(" a2 : " REG_FMT " a3 : " REG_FMT " a4 : " REG_FMT "\n", | |
49 | regs->a2, regs->a3, regs->a4); | |
50 | pr_cont(" a5 : " REG_FMT " a6 : " REG_FMT " a7 : " REG_FMT "\n", | |
51 | regs->a5, regs->a6, regs->a7); | |
52 | pr_cont(" s2 : " REG_FMT " s3 : " REG_FMT " s4 : " REG_FMT "\n", | |
53 | regs->s2, regs->s3, regs->s4); | |
54 | pr_cont(" s5 : " REG_FMT " s6 : " REG_FMT " s7 : " REG_FMT "\n", | |
55 | regs->s5, regs->s6, regs->s7); | |
56 | pr_cont(" s8 : " REG_FMT " s9 : " REG_FMT " s10: " REG_FMT "\n", | |
57 | regs->s8, regs->s9, regs->s10); | |
58 | pr_cont(" s11: " REG_FMT " t3 : " REG_FMT " t4 : " REG_FMT "\n", | |
59 | regs->s11, regs->t3, regs->t4); | |
60 | pr_cont(" t5 : " REG_FMT " t6 : " REG_FMT "\n", | |
61 | regs->t5, regs->t6); | |
62 | ||
a4c3733d CH |
63 | pr_cont("status: " REG_FMT " badaddr: " REG_FMT " cause: " REG_FMT "\n", |
64 | regs->status, regs->badaddr, regs->cause); | |
7db91e57 PD |
65 | } |
66 | ||
67 | void start_thread(struct pt_regs *regs, unsigned long pc, | |
68 | unsigned long sp) | |
69 | { | |
a4c3733d | 70 | regs->status = SR_PIE; |
8ac71d7e | 71 | if (has_fpu) { |
a4c3733d | 72 | regs->status |= SR_FS_INITIAL; |
8ac71d7e VC |
73 | /* |
74 | * Restore the initial value to the FP register | |
75 | * before starting the user program. | |
76 | */ | |
77 | fstate_restore(current, regs); | |
78 | } | |
a4c3733d | 79 | regs->epc = pc; |
7db91e57 PD |
80 | regs->sp = sp; |
81 | set_fs(USER_DS); | |
82 | } | |
83 | ||
84 | void flush_thread(void) | |
85 | { | |
9671f706 | 86 | #ifdef CONFIG_FPU |
7db91e57 | 87 | /* |
8ac71d7e | 88 | * Reset FPU state and context |
7db91e57 PD |
89 | * frm: round to nearest, ties to even (IEEE default) |
90 | * fflags: accrued exceptions cleared | |
91 | */ | |
8ac71d7e | 92 | fstate_off(current, task_pt_regs(current)); |
7db91e57 | 93 | memset(¤t->thread.fstate, 0, sizeof(current->thread.fstate)); |
9671f706 | 94 | #endif |
7db91e57 PD |
95 | } |
96 | ||
97 | int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src) | |
98 | { | |
99 | fstate_save(src, task_pt_regs(src)); | |
100 | *dst = *src; | |
101 | return 0; | |
102 | } | |
103 | ||
20bda4ed AA |
104 | int copy_thread_tls(unsigned long clone_flags, unsigned long usp, |
105 | unsigned long arg, struct task_struct *p, unsigned long tls) | |
7db91e57 PD |
106 | { |
107 | struct pt_regs *childregs = task_pt_regs(p); | |
108 | ||
109 | /* p->thread holds context to be restored by __switch_to() */ | |
110 | if (unlikely(p->flags & PF_KTHREAD)) { | |
111 | /* Kernel thread */ | |
7db91e57 | 112 | memset(childregs, 0, sizeof(struct pt_regs)); |
52e7c52d | 113 | childregs->gp = gp_in_global; |
a4c3733d CH |
114 | /* Supervisor/Machine, irqs on: */ |
115 | childregs->status = SR_PP | SR_PIE; | |
7db91e57 PD |
116 | |
117 | p->thread.ra = (unsigned long)ret_from_kernel_thread; | |
118 | p->thread.s[0] = usp; /* fn */ | |
119 | p->thread.s[1] = arg; | |
120 | } else { | |
121 | *childregs = *(current_pt_regs()); | |
122 | if (usp) /* User fork */ | |
123 | childregs->sp = usp; | |
124 | if (clone_flags & CLONE_SETTLS) | |
20bda4ed | 125 | childregs->tp = tls; |
7db91e57 PD |
126 | childregs->a0 = 0; /* Return value of fork() */ |
127 | p->thread.ra = (unsigned long)ret_from_fork; | |
128 | } | |
129 | p->thread.sp = (unsigned long)childregs; /* kernel sp */ | |
130 | return 0; | |
131 | } |