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Linux/arch/arm/include/asm/processor.h

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  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 
 25 struct debug_info {
 26 #ifdef CONFIG_HAVE_HW_BREAKPOINT
 27         struct perf_event       *hbp[ARM_MAX_HBP_SLOTS];
 28 #endif
 29 };
 30 
 31 struct 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  */
 44 static 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 */
 82 struct task_struct;
 83 
 84 unsigned 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
110 static 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
119 static 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 */
135 

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