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7db91e57 PD |
1 | /* |
2 | * Copyright (C) 2009 Sunplus Core Technology Co., Ltd. | |
3 | * Chen Liqin <liqin.chen@sunplusct.com> | |
4 | * Lennox Wu <lennox.wu@sunplusct.com> | |
5 | * Copyright (C) 2012 Regents of the University of California | |
6 | * Copyright (C) 2017 SiFive | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, see the file COPYING, or write | |
20 | * to the Free Software Foundation, Inc., | |
21 | */ | |
22 | ||
23 | #include <linux/kernel.h> | |
24 | #include <linux/sched.h> | |
25 | #include <linux/sched/task_stack.h> | |
26 | #include <linux/tick.h> | |
27 | #include <linux/ptrace.h> | |
28 | ||
29 | #include <asm/unistd.h> | |
30 | #include <asm/uaccess.h> | |
31 | #include <asm/processor.h> | |
32 | #include <asm/csr.h> | |
33 | #include <asm/string.h> | |
34 | #include <asm/switch_to.h> | |
35 | ||
36 | extern asmlinkage void ret_from_fork(void); | |
37 | extern asmlinkage void ret_from_kernel_thread(void); | |
38 | ||
39 | void arch_cpu_idle(void) | |
40 | { | |
41 | wait_for_interrupt(); | |
42 | local_irq_enable(); | |
43 | } | |
44 | ||
45 | void show_regs(struct pt_regs *regs) | |
46 | { | |
47 | show_regs_print_info(KERN_DEFAULT); | |
48 | ||
49 | pr_cont("sepc: " REG_FMT " ra : " REG_FMT " sp : " REG_FMT "\n", | |
50 | regs->sepc, regs->ra, regs->sp); | |
51 | pr_cont(" gp : " REG_FMT " tp : " REG_FMT " t0 : " REG_FMT "\n", | |
52 | regs->gp, regs->tp, regs->t0); | |
53 | pr_cont(" t1 : " REG_FMT " t2 : " REG_FMT " s0 : " REG_FMT "\n", | |
54 | regs->t1, regs->t2, regs->s0); | |
55 | pr_cont(" s1 : " REG_FMT " a0 : " REG_FMT " a1 : " REG_FMT "\n", | |
56 | regs->s1, regs->a0, regs->a1); | |
57 | pr_cont(" a2 : " REG_FMT " a3 : " REG_FMT " a4 : " REG_FMT "\n", | |
58 | regs->a2, regs->a3, regs->a4); | |
59 | pr_cont(" a5 : " REG_FMT " a6 : " REG_FMT " a7 : " REG_FMT "\n", | |
60 | regs->a5, regs->a6, regs->a7); | |
61 | pr_cont(" s2 : " REG_FMT " s3 : " REG_FMT " s4 : " REG_FMT "\n", | |
62 | regs->s2, regs->s3, regs->s4); | |
63 | pr_cont(" s5 : " REG_FMT " s6 : " REG_FMT " s7 : " REG_FMT "\n", | |
64 | regs->s5, regs->s6, regs->s7); | |
65 | pr_cont(" s8 : " REG_FMT " s9 : " REG_FMT " s10: " REG_FMT "\n", | |
66 | regs->s8, regs->s9, regs->s10); | |
67 | pr_cont(" s11: " REG_FMT " t3 : " REG_FMT " t4 : " REG_FMT "\n", | |
68 | regs->s11, regs->t3, regs->t4); | |
69 | pr_cont(" t5 : " REG_FMT " t6 : " REG_FMT "\n", | |
70 | regs->t5, regs->t6); | |
71 | ||
72 | pr_cont("sstatus: " REG_FMT " sbadaddr: " REG_FMT " scause: " REG_FMT "\n", | |
73 | regs->sstatus, regs->sbadaddr, regs->scause); | |
74 | } | |
75 | ||
76 | void start_thread(struct pt_regs *regs, unsigned long pc, | |
77 | unsigned long sp) | |
78 | { | |
1125203c | 79 | regs->sstatus = SR_SPIE /* User mode, irqs on */ | SR_FS_INITIAL; |
7db91e57 PD |
80 | regs->sepc = pc; |
81 | regs->sp = sp; | |
82 | set_fs(USER_DS); | |
83 | } | |
84 | ||
85 | void flush_thread(void) | |
86 | { | |
87 | /* | |
88 | * Reset FPU context | |
89 | * frm: round to nearest, ties to even (IEEE default) | |
90 | * fflags: accrued exceptions cleared | |
91 | */ | |
92 | memset(¤t->thread.fstate, 0, sizeof(current->thread.fstate)); | |
93 | } | |
94 | ||
95 | int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src) | |
96 | { | |
97 | fstate_save(src, task_pt_regs(src)); | |
98 | *dst = *src; | |
99 | return 0; | |
100 | } | |
101 | ||
102 | int copy_thread(unsigned long clone_flags, unsigned long usp, | |
103 | unsigned long arg, struct task_struct *p) | |
104 | { | |
105 | struct pt_regs *childregs = task_pt_regs(p); | |
106 | ||
107 | /* p->thread holds context to be restored by __switch_to() */ | |
108 | if (unlikely(p->flags & PF_KTHREAD)) { | |
109 | /* Kernel thread */ | |
110 | const register unsigned long gp __asm__ ("gp"); | |
111 | memset(childregs, 0, sizeof(struct pt_regs)); | |
112 | childregs->gp = gp; | |
1125203c | 113 | childregs->sstatus = SR_SPP | SR_SPIE; /* Supervisor, irqs on */ |
7db91e57 PD |
114 | |
115 | p->thread.ra = (unsigned long)ret_from_kernel_thread; | |
116 | p->thread.s[0] = usp; /* fn */ | |
117 | p->thread.s[1] = arg; | |
118 | } else { | |
119 | *childregs = *(current_pt_regs()); | |
120 | if (usp) /* User fork */ | |
121 | childregs->sp = usp; | |
122 | if (clone_flags & CLONE_SETTLS) | |
123 | childregs->tp = childregs->a5; | |
124 | childregs->a0 = 0; /* Return value of fork() */ | |
125 | p->thread.ra = (unsigned long)ret_from_fork; | |
126 | } | |
127 | p->thread.sp = (unsigned long)childregs; /* kernel sp */ | |
128 | return 0; | |
129 | } |