Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2012 Regents of the University of California
4 */
5
6#ifndef _ASM_RISCV_PROCESSOR_H
7#define _ASM_RISCV_PROCESSOR_H
8
9#include <linux/const.h>
10#include <linux/cache.h>
11#include <linux/prctl.h>
12
13#include <vdso/processor.h>
14
15#include <asm/ptrace.h>
16
17#ifdef CONFIG_64BIT
18#define DEFAULT_MAP_WINDOW (UL(1) << (MMAP_VA_BITS - 1))
19#define STACK_TOP_MAX TASK_SIZE_64
20
21#define arch_get_mmap_end(addr, len, flags) \
22({ \
23 unsigned long mmap_end; \
24 typeof(addr) _addr = (addr); \
25 if ((_addr) == 0 || (IS_ENABLED(CONFIG_COMPAT) && is_compat_task())) \
26 mmap_end = STACK_TOP_MAX; \
27 else if ((_addr) >= VA_USER_SV57) \
28 mmap_end = STACK_TOP_MAX; \
29 else if ((((_addr) >= VA_USER_SV48)) && (VA_BITS >= VA_BITS_SV48)) \
30 mmap_end = VA_USER_SV48; \
31 else \
32 mmap_end = VA_USER_SV39; \
33 mmap_end; \
34})
35
36#define arch_get_mmap_base(addr, base) \
37({ \
38 unsigned long mmap_base; \
39 typeof(addr) _addr = (addr); \
40 typeof(base) _base = (base); \
41 unsigned long rnd_gap = DEFAULT_MAP_WINDOW - (_base); \
42 if ((_addr) == 0 || (IS_ENABLED(CONFIG_COMPAT) && is_compat_task())) \
43 mmap_base = (_base); \
44 else if (((_addr) >= VA_USER_SV57) && (VA_BITS >= VA_BITS_SV57)) \
45 mmap_base = VA_USER_SV57 - rnd_gap; \
46 else if ((((_addr) >= VA_USER_SV48)) && (VA_BITS >= VA_BITS_SV48)) \
47 mmap_base = VA_USER_SV48 - rnd_gap; \
48 else \
49 mmap_base = VA_USER_SV39 - rnd_gap; \
50 mmap_base; \
51})
52
53#else
54#define DEFAULT_MAP_WINDOW TASK_SIZE
55#define STACK_TOP_MAX TASK_SIZE
56#endif
57#define STACK_ALIGN 16
58
59#define STACK_TOP DEFAULT_MAP_WINDOW
60
61/*
62 * This decides where the kernel will search for a free chunk of vm
63 * space during mmap's.
64 */
65#ifdef CONFIG_64BIT
66#define TASK_UNMAPPED_BASE PAGE_ALIGN((UL(1) << MMAP_MIN_VA_BITS) / 3)
67#else
68#define TASK_UNMAPPED_BASE PAGE_ALIGN(TASK_SIZE / 3)
69#endif
70
71#ifndef __ASSEMBLY__
72
73struct task_struct;
74struct pt_regs;
75
76/* CPU-specific state of a task */
77struct thread_struct {
78 /* Callee-saved registers */
79 unsigned long ra;
80 unsigned long sp; /* Kernel mode stack */
81 unsigned long s[12]; /* s[0]: frame pointer */
82 struct __riscv_d_ext_state fstate;
83 unsigned long bad_cause;
84 unsigned long vstate_ctrl;
85 struct __riscv_v_ext_state vstate;
86 unsigned long align_ctl;
87};
88
89/* Whitelist the fstate from the task_struct for hardened usercopy */
90static inline void arch_thread_struct_whitelist(unsigned long *offset,
91 unsigned long *size)
92{
93 *offset = offsetof(struct thread_struct, fstate);
94 *size = sizeof_field(struct thread_struct, fstate);
95}
96
97#define INIT_THREAD { \
98 .sp = sizeof(init_stack) + (long)&init_stack, \
99 .align_ctl = PR_UNALIGN_NOPRINT, \
100}
101
102#define task_pt_regs(tsk) \
103 ((struct pt_regs *)(task_stack_page(tsk) + THREAD_SIZE \
104 - ALIGN(sizeof(struct pt_regs), STACK_ALIGN)))
105
106#define KSTK_EIP(tsk) (task_pt_regs(tsk)->epc)
107#define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp)
108
109
110/* Do necessary setup to start up a newly executed thread. */
111extern void start_thread(struct pt_regs *regs,
112 unsigned long pc, unsigned long sp);
113
114extern unsigned long __get_wchan(struct task_struct *p);
115
116
117static inline void wait_for_interrupt(void)
118{
119 __asm__ __volatile__ ("wfi");
120}
121
122extern phys_addr_t dma32_phys_limit;
123
124struct device_node;
125int riscv_of_processor_hartid(struct device_node *node, unsigned long *hartid);
126int riscv_early_of_processor_hartid(struct device_node *node, unsigned long *hartid);
127int riscv_of_parent_hartid(struct device_node *node, unsigned long *hartid);
128
129extern void riscv_fill_hwcap(void);
130extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
131
132extern unsigned long signal_minsigstksz __ro_after_init;
133
134#ifdef CONFIG_RISCV_ISA_V
135/* Userspace interface for PR_RISCV_V_{SET,GET}_VS prctl()s: */
136#define RISCV_V_SET_CONTROL(arg) riscv_v_vstate_ctrl_set_current(arg)
137#define RISCV_V_GET_CONTROL() riscv_v_vstate_ctrl_get_current()
138extern long riscv_v_vstate_ctrl_set_current(unsigned long arg);
139extern long riscv_v_vstate_ctrl_get_current(void);
140#endif /* CONFIG_RISCV_ISA_V */
141
142extern int get_unalign_ctl(struct task_struct *tsk, unsigned long addr);
143extern int set_unalign_ctl(struct task_struct *tsk, unsigned int val);
144
145#define GET_UNALIGN_CTL(tsk, addr) get_unalign_ctl((tsk), (addr))
146#define SET_UNALIGN_CTL(tsk, val) set_unalign_ctl((tsk), (val))
147
148#endif /* __ASSEMBLY__ */
149
150#endif /* _ASM_RISCV_PROCESSOR_H */