cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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processor.h (3166B)

      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
     84/* Free all resources held by a thread. */
     85extern void release_thread(struct task_struct *);
     86
     87unsigned long __get_wchan(struct task_struct *p);
     88
     89#define task_pt_regs(p) \
     90	((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
     91
     92#define KSTK_EIP(tsk)	task_pt_regs(tsk)->ARM_pc
     93#define KSTK_ESP(tsk)	task_pt_regs(tsk)->ARM_sp
     94
     95#ifdef CONFIG_SMP
     96#define __ALT_SMP_ASM(smp, up)						\
     97	"9998:	" smp "\n"						\
     98	"	.pushsection \".alt.smp.init\", \"a\"\n"		\
     99	"	.align	2\n"						\
    100	"	.long	9998b - .\n"					\
    101	"	" up "\n"						\
    102	"	.popsection\n"
    103#else
    104#define __ALT_SMP_ASM(smp, up)	up
    105#endif
    106
    107/*
    108 * Prefetching support - only ARMv5.
    109 */
    110#if __LINUX_ARM_ARCH__ >= 5
    111
    112#define ARCH_HAS_PREFETCH
    113static inline void prefetch(const void *ptr)
    114{
    115	__asm__ __volatile__(
    116		"pld\t%a0"
    117		:: "p" (ptr));
    118}
    119
    120#if __LINUX_ARM_ARCH__ >= 7 && defined(CONFIG_SMP)
    121#define ARCH_HAS_PREFETCHW
    122static inline void prefetchw(const void *ptr)
    123{
    124	__asm__ __volatile__(
    125		".arch_extension	mp\n"
    126		__ALT_SMP_ASM(
    127			"pldw\t%a0",
    128			"pld\t%a0"
    129		)
    130		:: "p" (ptr));
    131}
    132#endif
    133#endif
    134
    135#endif
    136
    137#endif /* __ASM_ARM_PROCESSOR_H */