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linux
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arch
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arm
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include
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asm
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processor.h
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136 lines (116 loc) · 3.06 KB
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linux
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arm
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include
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asm
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processor.h
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/* SPDX-License-Identifier: GPL-2.0-only */ /* * arch/arm/include/asm/processor.h * * Copyright (C) 1995-1999 Russell King */ #ifndef __ASM_ARM_PROCESSOR_H #define __ASM_ARM_PROCESSOR_H #ifdef __KERNEL__ #include <asm/hw_breakpoint.h> #include <asm/ptrace.h> #include <asm/types.h> #include <asm/unified.h> #include <asm/vdso/processor.h> #ifdef __KERNEL__ #define STACK_TOP ((current->personality & ADDR_LIMIT_32BIT) ? \ TASK_SIZE : TASK_SIZE_26) #define STACK_TOP_MAX TASK_SIZE #endif struct debug_info { #ifdef CONFIG_HAVE_HW_BREAKPOINT struct perf_event *hbp[ARM_MAX_HBP_SLOTS]; #endif }; struct thread_struct { /* fault info */ unsigned long address; unsigned long trap_no; unsigned long error_code; /* debugging */ struct debug_info debug; }; /* * Everything usercopied to/from thread_struct is statically-sized, so * no hardened usercopy whitelist is needed. */ static inline void arch_thread_struct_whitelist(unsigned long *offset, unsigned long *size) { *offset = *size = 0; } #define INIT_THREAD { } #define start_thread(regs,pc,sp) \ ({ \ unsigned long r7, r8, r9; \ \ if (IS_ENABLED(CONFIG_BINFMT_ELF_FDPIC)) { \ r7 = regs->ARM_r7; \ r8 = regs->ARM_r8; \ r9 = regs->ARM_r9; \ } \ memset(regs->uregs, 0, sizeof(regs->uregs)); \ if (IS_ENABLED(CONFIG_BINFMT_ELF_FDPIC) && \ current->personality & FDPIC_FUNCPTRS) { \ regs->ARM_r7 = r7; \ regs->ARM_r8 = r8; \ regs->ARM_r9 = r9; \ regs->ARM_r10 = current->mm->start_data; \ } else if (!IS_ENABLED(CONFIG_MMU)) \ regs->ARM_r10 = current->mm->start_data; \ if (current->personality & ADDR_LIMIT_32BIT) \ regs->ARM_cpsr = USR_MODE; \ else \ regs->ARM_cpsr = USR26_MODE; \ if (elf_hwcap & HWCAP_THUMB && pc & 1) \ regs->ARM_cpsr |= PSR_T_BIT; \ regs->ARM_cpsr |= PSR_ENDSTATE; \ regs->ARM_pc = pc & ~1; /* pc */ \ regs->ARM_sp = sp; /* sp */ \ }) /* Forward declaration, a strange C thing */ struct task_struct; /* Free all resources held by a thread. */ extern void release_thread(struct task_struct *); unsigned long get_wchan(struct task_struct *p); #define task_pt_regs(p) \ ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1) #define KSTK_EIP(tsk) task_pt_regs(tsk)->ARM_pc #define KSTK_ESP(tsk) task_pt_regs(tsk)->ARM_sp #ifdef CONFIG_SMP #define __ALT_SMP_ASM(smp, up) \ "9998: " smp "\n" \ " .pushsection \".alt.smp.init\", \"a\"\n" \ " .long 9998b\n" \ " " up "\n" \ " .popsection\n" #else #define __ALT_SMP_ASM(smp, up) up #endif /* * Prefetching support - only ARMv5. */ #if __LINUX_ARM_ARCH__ >= 5 #define ARCH_HAS_PREFETCH static inline void prefetch(const void *ptr) { __asm__ __volatile__( "pld\t%a0" :: "p" (ptr)); } #if __LINUX_ARM_ARCH__ >= 7 && defined(CONFIG_SMP) #define ARCH_HAS_PREFETCHW static inline void prefetchw(const void *ptr) { __asm__ __volatile__( ".arch_extension mp\n" __ALT_SMP_ASM( "pldw\t%a0", "pld\t%a0" ) :: "p" (ptr)); } #endif #endif #endif #endif /* __ASM_ARM_PROCESSOR_H */
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