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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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e6978e4bf1
When we enter an exception, the current address limit should not apply to the exception context: if the exception context wishes to access kernel space via the user accessors (eg, perf code), it must explicitly request such access. Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
173 lines
4.2 KiB
C
173 lines
4.2 KiB
C
/*
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* arch/arm/include/asm/ptrace.h
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*
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* Copyright (C) 1996-2003 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __ASM_ARM_PTRACE_H
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#define __ASM_ARM_PTRACE_H
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#include <uapi/asm/ptrace.h>
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#ifndef __ASSEMBLY__
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#include <linux/types.h>
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struct pt_regs {
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unsigned long uregs[18];
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};
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struct svc_pt_regs {
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struct pt_regs regs;
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u32 dacr;
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u32 addr_limit;
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};
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#define to_svc_pt_regs(r) container_of(r, struct svc_pt_regs, regs)
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#define user_mode(regs) \
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(((regs)->ARM_cpsr & 0xf) == 0)
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#ifdef CONFIG_ARM_THUMB
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#define thumb_mode(regs) \
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(((regs)->ARM_cpsr & PSR_T_BIT))
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#else
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#define thumb_mode(regs) (0)
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#endif
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#ifndef CONFIG_CPU_V7M
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#define isa_mode(regs) \
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((((regs)->ARM_cpsr & PSR_J_BIT) >> (__ffs(PSR_J_BIT) - 1)) | \
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(((regs)->ARM_cpsr & PSR_T_BIT) >> (__ffs(PSR_T_BIT))))
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#else
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#define isa_mode(regs) 1 /* Thumb */
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#endif
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#define processor_mode(regs) \
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((regs)->ARM_cpsr & MODE_MASK)
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#define interrupts_enabled(regs) \
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(!((regs)->ARM_cpsr & PSR_I_BIT))
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#define fast_interrupts_enabled(regs) \
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(!((regs)->ARM_cpsr & PSR_F_BIT))
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/* Are the current registers suitable for user mode?
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* (used to maintain security in signal handlers)
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*/
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static inline int valid_user_regs(struct pt_regs *regs)
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{
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#ifndef CONFIG_CPU_V7M
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unsigned long mode = regs->ARM_cpsr & MODE_MASK;
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/*
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* Always clear the F (FIQ) and A (delayed abort) bits
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*/
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regs->ARM_cpsr &= ~(PSR_F_BIT | PSR_A_BIT);
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if ((regs->ARM_cpsr & PSR_I_BIT) == 0) {
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if (mode == USR_MODE)
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return 1;
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if (elf_hwcap & HWCAP_26BIT && mode == USR26_MODE)
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return 1;
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}
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/*
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* Force CPSR to something logical...
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*/
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regs->ARM_cpsr &= PSR_f | PSR_s | PSR_x | PSR_T_BIT | MODE32_BIT;
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if (!(elf_hwcap & HWCAP_26BIT))
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regs->ARM_cpsr |= USR_MODE;
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return 0;
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#else /* ifndef CONFIG_CPU_V7M */
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return 1;
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#endif
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}
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static inline long regs_return_value(struct pt_regs *regs)
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{
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return regs->ARM_r0;
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}
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#define instruction_pointer(regs) (regs)->ARM_pc
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#ifdef CONFIG_THUMB2_KERNEL
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#define frame_pointer(regs) (regs)->ARM_r7
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#else
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#define frame_pointer(regs) (regs)->ARM_fp
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#endif
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static inline void instruction_pointer_set(struct pt_regs *regs,
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unsigned long val)
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{
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instruction_pointer(regs) = val;
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}
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#ifdef CONFIG_SMP
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extern unsigned long profile_pc(struct pt_regs *regs);
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#else
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#define profile_pc(regs) instruction_pointer(regs)
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#endif
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#define predicate(x) ((x) & 0xf0000000)
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#define PREDICATE_ALWAYS 0xe0000000
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/*
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* True if instr is a 32-bit thumb instruction. This works if instr
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* is the first or only half-word of a thumb instruction. It also works
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* when instr holds all 32-bits of a wide thumb instruction if stored
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* in the form (first_half<<16)|(second_half)
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*/
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#define is_wide_instruction(instr) ((unsigned)(instr) >= 0xe800)
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/*
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* kprobe-based event tracer support
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*/
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#include <linux/stddef.h>
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#include <linux/types.h>
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#define MAX_REG_OFFSET (offsetof(struct pt_regs, ARM_ORIG_r0))
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extern int regs_query_register_offset(const char *name);
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extern const char *regs_query_register_name(unsigned int offset);
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extern bool regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr);
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extern unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
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unsigned int n);
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/**
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* regs_get_register() - get register value from its offset
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* @regs: pt_regs from which register value is gotten
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* @offset: offset number of the register.
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*
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* regs_get_register returns the value of a register whose offset from @regs.
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* The @offset is the offset of the register in struct pt_regs.
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* If @offset is bigger than MAX_REG_OFFSET, this returns 0.
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*/
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static inline unsigned long regs_get_register(struct pt_regs *regs,
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unsigned int offset)
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{
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if (unlikely(offset > MAX_REG_OFFSET))
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return 0;
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return *(unsigned long *)((unsigned long)regs + offset);
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}
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/* Valid only for Kernel mode traps. */
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static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
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{
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return regs->ARM_sp;
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}
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static inline unsigned long user_stack_pointer(struct pt_regs *regs)
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{
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return regs->ARM_sp;
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}
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#define current_pt_regs(void) ({ (struct pt_regs *) \
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((current_stack_pointer | (THREAD_SIZE - 1)) - 7) - 1; \
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})
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#endif /* __ASSEMBLY__ */
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#endif
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