1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * arch/arm/include/asm/processor.h
5 * Copyright (C) 1995-1999 Russell King
8 #ifndef __ASM_ARM_PROCESSOR_H
9 #define __ASM_ARM_PROCESSOR_H
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>
20 #define STACK_TOP ((current->personality & ADDR_LIMIT_32BIT) ? \
21 TASK_SIZE : TASK_SIZE_26)
22 #define STACK_TOP_MAX TASK_SIZE
26 #ifdef CONFIG_HAVE_HW_BREAKPOINT
27 struct perf_event *hbp[ARM_MAX_HBP_SLOTS];
31 struct thread_struct {
33 unsigned long address;
34 unsigned long trap_no;
35 unsigned long error_code;
37 struct debug_info debug;
41 * Everything usercopied to/from thread_struct is statically-sized, so
42 * no hardened usercopy whitelist is needed.
44 static inline void arch_thread_struct_whitelist(unsigned long *offset,
50 #define INIT_THREAD { }
52 #define start_thread(regs,pc,sp) \
54 unsigned long r7, r8, r9; \
56 if (IS_ENABLED(CONFIG_BINFMT_ELF_FDPIC)) { \
61 memset(regs->uregs, 0, sizeof(regs->uregs)); \
62 if (IS_ENABLED(CONFIG_BINFMT_ELF_FDPIC) && \
63 current->personality & FDPIC_FUNCPTRS) { \
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; \
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 */ \
81 /* Forward declaration, a strange C thing */
84 unsigned long __get_wchan(struct task_struct *p);
86 #define task_pt_regs(p) \
87 ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
89 #define KSTK_EIP(tsk) task_pt_regs(tsk)->ARM_pc
90 #define KSTK_ESP(tsk) task_pt_regs(tsk)->ARM_sp
93 #define __ALT_SMP_ASM(smp, up) \
95 " .pushsection \".alt.smp.init\", \"a\"\n" \
97 " .long 9998b - .\n" \
101 #define __ALT_SMP_ASM(smp, up) up
105 * Prefetching support - only ARMv5.
107 #if __LINUX_ARM_ARCH__ >= 5
109 #define ARCH_HAS_PREFETCH
110 static inline void prefetch(const void *ptr)
112 __asm__ __volatile__(
117 #if __LINUX_ARM_ARCH__ >= 7 && defined(CONFIG_SMP)
118 #define ARCH_HAS_PREFETCHW
119 static inline void prefetchw(const void *ptr)
121 __asm__ __volatile__(
122 ".arch_extension mp\n"
134 #endif /* __ASM_ARM_PROCESSOR_H */