nagai/kernel
3
0
Fork 0
forked from mirrors/linux
Code Pull requests Activity
kernel/arch/arm/include/asm/ptrace.h
Will Deacon d15155824c linux/compiler.h: Split into compiler.h and compiler_types.h 
linux/compiler.h is included indirectly by linux/types.h via
uapi/linux/types.h -> uapi/linux/posix_types.h -> linux/stddef.h
-> uapi/linux/stddef.h and is needed to provide a proper definition of
offsetof.

Unfortunately, compiler.h requires a definition of
smp_read_barrier_depends() for defining lockless_dereference() and soon
for defining READ_ONCE(), which means that all
users of READ_ONCE() will need to include asm/barrier.h to avoid splats
such as:

   In file included from include/uapi/linux/stddef.h:1:0,
                    from include/linux/stddef.h:4,
                    from arch/h8300/kernel/asm-offsets.c:11:
   include/linux/list.h: In function 'list_empty':
>> include/linux/compiler.h:343:2: error: implicit declaration of function 'smp_read_barrier_depends' [-Werror=implicit-function-declaration]
     smp_read_barrier_depends(); /* Enforce dependency ordering from x */ \
     ^

A better alternative is to include asm/barrier.h in linux/compiler.h,
but this requires a type definition for "bool" on some architectures
(e.g. x86), which is defined later by linux/types.h. Type "bool" is also
used directly in linux/compiler.h, so the whole thing is pretty fragile.

This patch splits compiler.h in two: compiler_types.h contains type
annotations, definitions and the compiler-specific parts, whereas
compiler.h #includes compiler-types.h and additionally defines macros
such as {READ,WRITE.ACCESS}_ONCE().

uapi/linux/stddef.h and linux/linkage.h are then moved over to include
linux/compiler_types.h, which fixes the build for h8 and blackfin.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1508840570-22169-2-git-send-email-will.deacon@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-10-24 13:17:32 +02:00

171 lines
4.2 KiB
C
Raw Blame History

/*
* arch/arm/include/asm/ptrace.h
*
* Copyright (C) 1996-2003 Russell King
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef __ASM_ARM_PTRACE_H
#define __ASM_ARM_PTRACE_H
#include <uapi/asm/ptrace.h>
#ifndef __ASSEMBLY__
#include <linux/types.h>
struct pt_regs {
unsigned long uregs[18];
};
struct svc_pt_regs {
struct pt_regs regs;
u32 dacr;
u32 addr_limit;
};
#define to_svc_pt_regs(r) container_of(r, struct svc_pt_regs, regs)
#define user_mode(regs) \
(((regs)->ARM_cpsr & 0xf) == 0)
#ifdef CONFIG_ARM_THUMB
#define thumb_mode(regs) \
(((regs)->ARM_cpsr & PSR_T_BIT))
#else
#define thumb_mode(regs) (0)
#endif
#ifndef CONFIG_CPU_V7M
#define isa_mode(regs) \
((((regs)->ARM_cpsr & PSR_J_BIT) >> (__ffs(PSR_J_BIT) - 1)) | \
(((regs)->ARM_cpsr & PSR_T_BIT) >> (__ffs(PSR_T_BIT))))
#else
#define isa_mode(regs) 1 /* Thumb */
#endif
#define processor_mode(regs) \
((regs)->ARM_cpsr & MODE_MASK)
#define interrupts_enabled(regs) \
(!((regs)->ARM_cpsr & PSR_I_BIT))
#define fast_interrupts_enabled(regs) \
(!((regs)->ARM_cpsr & PSR_F_BIT))
/* Are the current registers suitable for user mode?
* (used to maintain security in signal handlers)
*/
static inline int valid_user_regs(struct pt_regs *regs)
{
#ifndef CONFIG_CPU_V7M
unsigned long mode = regs->ARM_cpsr & MODE_MASK;
/*
* Always clear the F (FIQ) and A (delayed abort) bits
*/
regs->ARM_cpsr &= ~(PSR_F_BIT | PSR_A_BIT);
if ((regs->ARM_cpsr & PSR_I_BIT) == 0) {
if (mode == USR_MODE)
return 1;
if (elf_hwcap & HWCAP_26BIT && mode == USR26_MODE)
return 1;
}
/*
* Force CPSR to something logical...
*/
regs->ARM_cpsr &= PSR_f | PSR_s | PSR_x | PSR_T_BIT | MODE32_BIT;
if (!(elf_hwcap & HWCAP_26BIT))
regs->ARM_cpsr |= USR_MODE;
return 0;
#else /* ifndef CONFIG_CPU_V7M */
return 1;
#endif
}
static inline long regs_return_value(struct pt_regs *regs)
{
return regs->ARM_r0;
}
#define instruction_pointer(regs) (regs)->ARM_pc
#ifdef CONFIG_THUMB2_KERNEL
#define frame_pointer(regs) (regs)->ARM_r7
#else
#define frame_pointer(regs) (regs)->ARM_fp
#endif
static inline void instruction_pointer_set(struct pt_regs *regs,
unsigned long val)
{
instruction_pointer(regs) = val;
}
#ifdef CONFIG_SMP
extern unsigned long profile_pc(struct pt_regs *regs);
#else
#define profile_pc(regs) instruction_pointer(regs)
#endif
#define predicate(x) ((x) & 0xf0000000)
#define PREDICATE_ALWAYS 0xe0000000
/*
* True if instr is a 32-bit thumb instruction. This works if instr
* is the first or only half-word of a thumb instruction. It also works
* when instr holds all 32-bits of a wide thumb instruction if stored
* in the form (first_half<<16)|(second_half)
*/
#define is_wide_instruction(instr) ((unsigned)(instr) >= 0xe800)
/*
* kprobe-based event tracer support
*/
#include <linux/compiler.h>
#define MAX_REG_OFFSET (offsetof(struct pt_regs, ARM_ORIG_r0))
extern int regs_query_register_offset(const char *name);
extern const char *regs_query_register_name(unsigned int offset);
extern bool regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr);
extern unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
unsigned int n);
/**
* regs_get_register() - get register value from its offset
* @regs: pt_regs from which register value is gotten
* @offset: offset number of the register.
*
* regs_get_register returns the value of a register whose offset from @regs.
* The @offset is the offset of the register in struct pt_regs.
* If @offset is bigger than MAX_REG_OFFSET, this returns 0.
*/
static inline unsigned long regs_get_register(struct pt_regs *regs,
unsigned int offset)
{
if (unlikely(offset > MAX_REG_OFFSET))
return 0;
return *(unsigned long *)((unsigned long)regs + offset);
}
/* Valid only for Kernel mode traps. */
static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
{
return regs->ARM_sp;
}
static inline unsigned long user_stack_pointer(struct pt_regs *regs)
{
return regs->ARM_sp;
}
#define current_pt_regs(void) ({ (struct pt_regs *) \
((current_stack_pointer | (THREAD_SIZE - 1)) - 7) - 1; \
})
#endif /* __ASSEMBLY__ */
#endif
View git blame Copy permalink