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1// SPDX-License-Identifier: GPL-2.0-or-later
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
8 */
9
10#include <linux/cpu.h>
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>
16#include <linux/uaccess.h>
17
18#include <asm/unistd.h>
19#include <asm/processor.h>
20#include <asm/csr.h>
21#include <asm/string.h>
22#include <asm/switch_to.h>
23#include <asm/thread_info.h>
24
25extern asmlinkage void ret_from_fork(void);
26extern asmlinkage void ret_from_kernel_thread(void);
27
28void arch_cpu_idle(void)
29{
30 wait_for_interrupt();
31 local_irq_enable();
32}
33
34void show_regs(struct pt_regs *regs)
35{
36 show_regs_print_info(KERN_DEFAULT);
37
38 pr_cont("sepc: " REG_FMT " ra : " REG_FMT " sp : " REG_FMT "\n",
39 regs->sepc, regs->ra, regs->sp);
40 pr_cont(" gp : " REG_FMT " tp : " REG_FMT " t0 : " REG_FMT "\n",
41 regs->gp, regs->tp, regs->t0);
42 pr_cont(" t1 : " REG_FMT " t2 : " REG_FMT " s0 : " REG_FMT "\n",
43 regs->t1, regs->t2, regs->s0);
44 pr_cont(" s1 : " REG_FMT " a0 : " REG_FMT " a1 : " REG_FMT "\n",
45 regs->s1, regs->a0, regs->a1);
46 pr_cont(" a2 : " REG_FMT " a3 : " REG_FMT " a4 : " REG_FMT "\n",
47 regs->a2, regs->a3, regs->a4);
48 pr_cont(" a5 : " REG_FMT " a6 : " REG_FMT " a7 : " REG_FMT "\n",
49 regs->a5, regs->a6, regs->a7);
50 pr_cont(" s2 : " REG_FMT " s3 : " REG_FMT " s4 : " REG_FMT "\n",
51 regs->s2, regs->s3, regs->s4);
52 pr_cont(" s5 : " REG_FMT " s6 : " REG_FMT " s7 : " REG_FMT "\n",
53 regs->s5, regs->s6, regs->s7);
54 pr_cont(" s8 : " REG_FMT " s9 : " REG_FMT " s10: " REG_FMT "\n",
55 regs->s8, regs->s9, regs->s10);
56 pr_cont(" s11: " REG_FMT " t3 : " REG_FMT " t4 : " REG_FMT "\n",
57 regs->s11, regs->t3, regs->t4);
58 pr_cont(" t5 : " REG_FMT " t6 : " REG_FMT "\n",
59 regs->t5, regs->t6);
60
61 pr_cont("sstatus: " REG_FMT " sbadaddr: " REG_FMT " scause: " REG_FMT "\n",
62 regs->sstatus, regs->sbadaddr, regs->scause);
63}
64
65void start_thread(struct pt_regs *regs, unsigned long pc,
66 unsigned long sp)
67{
68 regs->sstatus = SR_SPIE;
69 if (has_fpu) {
70 regs->sstatus |= SR_FS_INITIAL;
71 /*
72 * Restore the initial value to the FP register
73 * before starting the user program.
74 */
75 fstate_restore(current, regs);
76 }
77 regs->sepc = pc;
78 regs->sp = sp;
79 set_fs(USER_DS);
80}
81
82void flush_thread(void)
83{
84#ifdef CONFIG_FPU
85 /*
86 * Reset FPU state and context
87 * frm: round to nearest, ties to even (IEEE default)
88 * fflags: accrued exceptions cleared
89 */
90 fstate_off(current, task_pt_regs(current));
91 memset(¤t->thread.fstate, 0, sizeof(current->thread.fstate));
92#endif
93}
94
95int 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
102int 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;
113 childregs->sstatus = SR_SPP | SR_SPIE; /* Supervisor, irqs on */
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}
1// SPDX-License-Identifier: GPL-2.0-or-later
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
8 */
9
10#include <linux/cpu.h>
11#include <linux/kernel.h>
12#include <linux/sched.h>
13#include <linux/sched/debug.h>
14#include <linux/sched/task_stack.h>
15#include <linux/tick.h>
16#include <linux/ptrace.h>
17#include <linux/uaccess.h>
18
19#include <asm/unistd.h>
20#include <asm/processor.h>
21#include <asm/csr.h>
22#include <asm/stacktrace.h>
23#include <asm/string.h>
24#include <asm/switch_to.h>
25#include <asm/thread_info.h>
26
27register unsigned long gp_in_global __asm__("gp");
28
29#if defined(CONFIG_STACKPROTECTOR) && !defined(CONFIG_STACKPROTECTOR_PER_TASK)
30#include <linux/stackprotector.h>
31unsigned long __stack_chk_guard __read_mostly;
32EXPORT_SYMBOL(__stack_chk_guard);
33#endif
34
35extern asmlinkage void ret_from_fork(void);
36extern asmlinkage void ret_from_kernel_thread(void);
37
38void arch_cpu_idle(void)
39{
40 wait_for_interrupt();
41 raw_local_irq_enable();
42}
43
44void __show_regs(struct pt_regs *regs)
45{
46 show_regs_print_info(KERN_DEFAULT);
47
48 if (!user_mode(regs)) {
49 pr_cont("epc : %pS\n", (void *)regs->epc);
50 pr_cont(" ra : %pS\n", (void *)regs->ra);
51 }
52
53 pr_cont("epc : " REG_FMT " ra : " REG_FMT " sp : " REG_FMT "\n",
54 regs->epc, regs->ra, regs->sp);
55 pr_cont(" gp : " REG_FMT " tp : " REG_FMT " t0 : " REG_FMT "\n",
56 regs->gp, regs->tp, regs->t0);
57 pr_cont(" t1 : " REG_FMT " t2 : " REG_FMT " s0 : " REG_FMT "\n",
58 regs->t1, regs->t2, regs->s0);
59 pr_cont(" s1 : " REG_FMT " a0 : " REG_FMT " a1 : " REG_FMT "\n",
60 regs->s1, regs->a0, regs->a1);
61 pr_cont(" a2 : " REG_FMT " a3 : " REG_FMT " a4 : " REG_FMT "\n",
62 regs->a2, regs->a3, regs->a4);
63 pr_cont(" a5 : " REG_FMT " a6 : " REG_FMT " a7 : " REG_FMT "\n",
64 regs->a5, regs->a6, regs->a7);
65 pr_cont(" s2 : " REG_FMT " s3 : " REG_FMT " s4 : " REG_FMT "\n",
66 regs->s2, regs->s3, regs->s4);
67 pr_cont(" s5 : " REG_FMT " s6 : " REG_FMT " s7 : " REG_FMT "\n",
68 regs->s5, regs->s6, regs->s7);
69 pr_cont(" s8 : " REG_FMT " s9 : " REG_FMT " s10: " REG_FMT "\n",
70 regs->s8, regs->s9, regs->s10);
71 pr_cont(" s11: " REG_FMT " t3 : " REG_FMT " t4 : " REG_FMT "\n",
72 regs->s11, regs->t3, regs->t4);
73 pr_cont(" t5 : " REG_FMT " t6 : " REG_FMT "\n",
74 regs->t5, regs->t6);
75
76 pr_cont("status: " REG_FMT " badaddr: " REG_FMT " cause: " REG_FMT "\n",
77 regs->status, regs->badaddr, regs->cause);
78}
79void show_regs(struct pt_regs *regs)
80{
81 __show_regs(regs);
82 if (!user_mode(regs))
83 dump_backtrace(regs, NULL, KERN_DEFAULT);
84}
85
86void start_thread(struct pt_regs *regs, unsigned long pc,
87 unsigned long sp)
88{
89 regs->status = SR_PIE;
90 if (has_fpu()) {
91 regs->status |= SR_FS_INITIAL;
92 /*
93 * Restore the initial value to the FP register
94 * before starting the user program.
95 */
96 fstate_restore(current, regs);
97 }
98 regs->epc = pc;
99 regs->sp = sp;
100}
101
102void flush_thread(void)
103{
104#ifdef CONFIG_FPU
105 /*
106 * Reset FPU state and context
107 * frm: round to nearest, ties to even (IEEE default)
108 * fflags: accrued exceptions cleared
109 */
110 fstate_off(current, task_pt_regs(current));
111 memset(¤t->thread.fstate, 0, sizeof(current->thread.fstate));
112#endif
113}
114
115int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
116{
117 fstate_save(src, task_pt_regs(src));
118 *dst = *src;
119 return 0;
120}
121
122int copy_thread(unsigned long clone_flags, unsigned long usp, unsigned long arg,
123 struct task_struct *p, unsigned long tls)
124{
125 struct pt_regs *childregs = task_pt_regs(p);
126
127 /* p->thread holds context to be restored by __switch_to() */
128 if (unlikely(p->flags & (PF_KTHREAD | PF_IO_WORKER))) {
129 /* Kernel thread */
130 memset(childregs, 0, sizeof(struct pt_regs));
131 childregs->gp = gp_in_global;
132 /* Supervisor/Machine, irqs on: */
133 childregs->status = SR_PP | SR_PIE;
134
135 p->thread.ra = (unsigned long)ret_from_kernel_thread;
136 p->thread.s[0] = usp; /* fn */
137 p->thread.s[1] = arg;
138 } else {
139 *childregs = *(current_pt_regs());
140 if (usp) /* User fork */
141 childregs->sp = usp;
142 if (clone_flags & CLONE_SETTLS)
143 childregs->tp = tls;
144 childregs->a0 = 0; /* Return value of fork() */
145 p->thread.ra = (unsigned long)ret_from_fork;
146 }
147 p->thread.sp = (unsigned long)childregs; /* kernel sp */
148 return 0;
149}