Loading...
1/*
2 * arch/arm/include/asm/processor.h
3 *
4 * Copyright (C) 1995-1999 Russell King
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11#ifndef __ASM_ARM_PROCESSOR_H
12#define __ASM_ARM_PROCESSOR_H
13
14/*
15 * Default implementation of macro that returns current
16 * instruction pointer ("program counter").
17 */
18#define current_text_addr() ({ __label__ _l; _l: &&_l;})
19
20#ifdef __KERNEL__
21
22#include <asm/hw_breakpoint.h>
23#include <asm/ptrace.h>
24#include <asm/types.h>
25
26#ifdef __KERNEL__
27#define STACK_TOP ((current->personality & ADDR_LIMIT_32BIT) ? \
28 TASK_SIZE : TASK_SIZE_26)
29#define STACK_TOP_MAX TASK_SIZE
30#endif
31
32struct debug_info {
33#ifdef CONFIG_HAVE_HW_BREAKPOINT
34 struct perf_event *hbp[ARM_MAX_HBP_SLOTS];
35#endif
36};
37
38struct thread_struct {
39 /* fault info */
40 unsigned long address;
41 unsigned long trap_no;
42 unsigned long error_code;
43 /* debugging */
44 struct debug_info debug;
45};
46
47#define INIT_THREAD { }
48
49#ifdef CONFIG_MMU
50#define nommu_start_thread(regs) do { } while (0)
51#else
52#define nommu_start_thread(regs) regs->ARM_r10 = current->mm->start_data
53#endif
54
55#define start_thread(regs,pc,sp) \
56({ \
57 unsigned long *stack = (unsigned long *)sp; \
58 memset(regs->uregs, 0, sizeof(regs->uregs)); \
59 if (current->personality & ADDR_LIMIT_32BIT) \
60 regs->ARM_cpsr = USR_MODE; \
61 else \
62 regs->ARM_cpsr = USR26_MODE; \
63 if (elf_hwcap & HWCAP_THUMB && pc & 1) \
64 regs->ARM_cpsr |= PSR_T_BIT; \
65 regs->ARM_cpsr |= PSR_ENDSTATE; \
66 regs->ARM_pc = pc & ~1; /* pc */ \
67 regs->ARM_sp = sp; /* sp */ \
68 regs->ARM_r2 = stack[2]; /* r2 (envp) */ \
69 regs->ARM_r1 = stack[1]; /* r1 (argv) */ \
70 regs->ARM_r0 = stack[0]; /* r0 (argc) */ \
71 nommu_start_thread(regs); \
72})
73
74/* Forward declaration, a strange C thing */
75struct task_struct;
76
77/* Free all resources held by a thread. */
78extern void release_thread(struct task_struct *);
79
80unsigned long get_wchan(struct task_struct *p);
81
82#if __LINUX_ARM_ARCH__ == 6 || defined(CONFIG_ARM_ERRATA_754327)
83#define cpu_relax() smp_mb()
84#else
85#define cpu_relax() barrier()
86#endif
87
88/*
89 * Create a new kernel thread
90 */
91extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
92
93#define task_pt_regs(p) \
94 ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
95
96#define KSTK_EIP(tsk) task_pt_regs(tsk)->ARM_pc
97#define KSTK_ESP(tsk) task_pt_regs(tsk)->ARM_sp
98
99/*
100 * Prefetching support - only ARMv5.
101 */
102#if __LINUX_ARM_ARCH__ >= 5
103
104#define ARCH_HAS_PREFETCH
105static inline void prefetch(const void *ptr)
106{
107 __asm__ __volatile__(
108 "pld\t%a0"
109 :
110 : "p" (ptr)
111 : "cc");
112}
113
114#define ARCH_HAS_PREFETCHW
115#define prefetchw(ptr) prefetch(ptr)
116
117#define ARCH_HAS_SPINLOCK_PREFETCH
118#define spin_lock_prefetch(x) do { } while (0)
119
120#endif
121
122#define HAVE_ARCH_PICK_MMAP_LAYOUT
123
124#endif
125
126#endif /* __ASM_ARM_PROCESSOR_H */
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * arch/arm/include/asm/processor.h
4 *
5 * Copyright (C) 1995-1999 Russell King
6 */
7
8#ifndef __ASM_ARM_PROCESSOR_H
9#define __ASM_ARM_PROCESSOR_H
10
11#ifdef __KERNEL__
12
13#include <asm/hw_breakpoint.h>
14#include <asm/ptrace.h>
15#include <asm/types.h>
16#include <asm/unified.h>
17#include <asm/vdso/processor.h>
18
19#ifdef __KERNEL__
20#define STACK_TOP ((current->personality & ADDR_LIMIT_32BIT) ? \
21 TASK_SIZE : TASK_SIZE_26)
22#define STACK_TOP_MAX TASK_SIZE
23#endif
24
25struct debug_info {
26#ifdef CONFIG_HAVE_HW_BREAKPOINT
27 struct perf_event *hbp[ARM_MAX_HBP_SLOTS];
28#endif
29};
30
31struct thread_struct {
32 /* fault info */
33 unsigned long address;
34 unsigned long trap_no;
35 unsigned long error_code;
36 /* debugging */
37 struct debug_info debug;
38};
39
40/*
41 * Everything usercopied to/from thread_struct is statically-sized, so
42 * no hardened usercopy whitelist is needed.
43 */
44static inline void arch_thread_struct_whitelist(unsigned long *offset,
45 unsigned long *size)
46{
47 *offset = *size = 0;
48}
49
50#define INIT_THREAD { }
51
52#define start_thread(regs,pc,sp) \
53({ \
54 unsigned long r7, r8, r9; \
55 \
56 if (IS_ENABLED(CONFIG_BINFMT_ELF_FDPIC)) { \
57 r7 = regs->ARM_r7; \
58 r8 = regs->ARM_r8; \
59 r9 = regs->ARM_r9; \
60 } \
61 memset(regs->uregs, 0, sizeof(regs->uregs)); \
62 if (IS_ENABLED(CONFIG_BINFMT_ELF_FDPIC) && \
63 current->personality & FDPIC_FUNCPTRS) { \
64 regs->ARM_r7 = r7; \
65 regs->ARM_r8 = r8; \
66 regs->ARM_r9 = r9; \
67 regs->ARM_r10 = current->mm->start_data; \
68 } else if (!IS_ENABLED(CONFIG_MMU)) \
69 regs->ARM_r10 = current->mm->start_data; \
70 if (current->personality & ADDR_LIMIT_32BIT) \
71 regs->ARM_cpsr = USR_MODE; \
72 else \
73 regs->ARM_cpsr = USR26_MODE; \
74 if (elf_hwcap & HWCAP_THUMB && pc & 1) \
75 regs->ARM_cpsr |= PSR_T_BIT; \
76 regs->ARM_cpsr |= PSR_ENDSTATE; \
77 regs->ARM_pc = pc & ~1; /* pc */ \
78 regs->ARM_sp = sp; /* sp */ \
79})
80
81/* Forward declaration, a strange C thing */
82struct task_struct;
83
84unsigned long __get_wchan(struct task_struct *p);
85
86#define task_pt_regs(p) \
87 ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
88
89#define KSTK_EIP(tsk) task_pt_regs(tsk)->ARM_pc
90#define KSTK_ESP(tsk) task_pt_regs(tsk)->ARM_sp
91
92#ifdef CONFIG_SMP
93#define __ALT_SMP_ASM(smp, up) \
94 "9998: " smp "\n" \
95 " .pushsection \".alt.smp.init\", \"a\"\n" \
96 " .align 2\n" \
97 " .long 9998b - .\n" \
98 " " up "\n" \
99 " .popsection\n"
100#else
101#define __ALT_SMP_ASM(smp, up) up
102#endif
103
104/*
105 * Prefetching support - only ARMv5.
106 */
107#if __LINUX_ARM_ARCH__ >= 5
108
109#define ARCH_HAS_PREFETCH
110static inline void prefetch(const void *ptr)
111{
112 __asm__ __volatile__(
113 "pld\t%a0"
114 :: "p" (ptr));
115}
116
117#if __LINUX_ARM_ARCH__ >= 7 && defined(CONFIG_SMP)
118#define ARCH_HAS_PREFETCHW
119static inline void prefetchw(const void *ptr)
120{
121 __asm__ __volatile__(
122 ".arch_extension mp\n"
123 __ALT_SMP_ASM(
124 "pldw\t%a0",
125 "pld\t%a0"
126 )
127 :: "p" (ptr));
128}
129#endif
130#endif
131
132#endif
133
134#endif /* __ASM_ARM_PROCESSOR_H */