arch/arm/include/asm/ftrace.h

Source file repositories/reference/linux-study-clean/arch/arm/include/asm/ftrace.h

File Facts

System
Linux kernel
Corpus path
arch/arm/include/asm/ftrace.h
Extension
.h
Size
2006 bytes
Lines
85
Domain
Architecture Layer
Bucket
arch/arm
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

struct dyn_arch_ftrace {
#ifdef CONFIG_ARM_MODULE_PLTS
	struct module *mod;
#endif
};

static inline unsigned long ftrace_call_adjust(unsigned long addr)
{
	/* With Thumb-2, the recorded addresses have the lsb set */
	return addr & ~1;
}
#endif

#endif

#endif

#ifndef __ASSEMBLY__

#if defined(CONFIG_FRAME_POINTER) && !defined(CONFIG_ARM_UNWIND)
/*
 * return_address uses walk_stackframe to do it's work.  If both
 * CONFIG_FRAME_POINTER=y and CONFIG_ARM_UNWIND=y walk_stackframe uses unwind
 * information.  For this to work in the function tracer many functions would
 * have to be marked with __notrace.  So for now just depend on
 * !CONFIG_ARM_UNWIND.
 */

void *return_address(unsigned int);

#else

static inline void *return_address(unsigned int level)
{
       return NULL;
}

#endif

#define ftrace_return_address(n) return_address(n)

#define ARCH_HAS_SYSCALL_MATCH_SYM_NAME

static inline bool arch_syscall_match_sym_name(const char *sym,
					       const char *name)
{
	if (!strcmp(sym, "sys_mmap2"))
		sym = "sys_mmap_pgoff";
	else if (!strcmp(sym, "sys_statfs64_wrapper"))
		sym = "sys_statfs64";
	else if (!strcmp(sym, "sys_fstatfs64_wrapper"))
		sym = "sys_fstatfs64";
	else if (!strcmp(sym, "sys_arm_fadvise64_64"))
		sym = "sys_fadvise64_64";

	/* Ignore case since sym may start with "SyS" instead of "sys" */
	return !strcasecmp(sym, name);
}

void prepare_ftrace_return(unsigned long *parent, unsigned long self,
			   unsigned long frame_pointer,
			   unsigned long stack_pointer);

#endif /* ifndef __ASSEMBLY__ */

#endif /* _ASM_ARM_FTRACE */

Annotation

Implementation Notes