arch/s390/include/asm/ftrace.h

Source file repositories/reference/linux-study-clean/arch/s390/include/asm/ftrace.h

File Facts

System
Linux kernel
Corpus path
arch/s390/include/asm/ftrace.h
Extension
.h
Size
3811 bytes
Lines
150
Domain
Architecture Layer
Bucket
arch/s390
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 { };

#define MCOUNT_ADDR 0
#define FTRACE_ADDR ((unsigned long)ftrace_caller)

#define KPROBE_ON_FTRACE_NOP	0
#define KPROBE_ON_FTRACE_CALL	1

struct module;
struct dyn_ftrace;
struct ftrace_ops;

bool ftrace_need_init_nop(void);
#define ftrace_need_init_nop ftrace_need_init_nop

int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec);
#define ftrace_init_nop ftrace_init_nop

static inline unsigned long ftrace_call_adjust(unsigned long addr)
{
	return addr;
}
#define ftrace_get_symaddr(fentry_ip) ((unsigned long)(fentry_ip))

#include <linux/ftrace_regs.h>

static __always_inline struct pt_regs *arch_ftrace_get_regs(struct ftrace_regs *fregs)
{
	struct pt_regs *regs = &arch_ftrace_regs(fregs)->regs;

	if (test_pt_regs_flag(regs, PIF_FTRACE_FULL_REGS))
		return regs;
	return NULL;
}

static __always_inline void
ftrace_regs_set_instruction_pointer(struct ftrace_regs *fregs,
				    unsigned long ip)
{
	arch_ftrace_regs(fregs)->regs.psw.addr = ip;
}

#undef ftrace_regs_get_frame_pointer
static __always_inline unsigned long
ftrace_regs_get_frame_pointer(struct ftrace_regs *fregs)
{
	return ftrace_regs_get_stack_pointer(fregs);
}

static __always_inline unsigned long
ftrace_regs_get_return_address(const struct ftrace_regs *fregs)
{
	return arch_ftrace_regs(fregs)->regs.gprs[14];
}

#define arch_ftrace_fill_perf_regs(fregs, _regs)	 do {		\
		(_regs)->psw.mask = 0;					\
		(_regs)->psw.addr = arch_ftrace_regs(fregs)->regs.psw.addr;		\
		(_regs)->gprs[15] = arch_ftrace_regs(fregs)->regs.gprs[15];		\
	} while (0)

#ifdef CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
/*
 * When an ftrace registered caller is tracing a function that is
 * also set by a register_ftrace_direct() call, it needs to be
 * differentiated in the ftrace_caller trampoline. To do this,
 * place the direct caller in the ORIG_GPR2 part of pt_regs. This
 * tells the ftrace_caller that there's a direct caller.
 */
static inline void arch_ftrace_set_direct_caller(struct ftrace_regs *fregs, unsigned long addr)
{
	struct pt_regs *regs = &arch_ftrace_regs(fregs)->regs;
	regs->orig_gpr2 = addr;
}
#endif /* CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS */

#define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
static inline bool arch_syscall_match_sym_name(const char *sym,
					       const char *name)
{
	/* Skip the __s390x_ prefix. */
	return !strcmp(sym + 7, name) || !strcmp(sym + 8, name);
}

void ftrace_graph_func(unsigned long ip, unsigned long parent_ip,
		       struct ftrace_ops *op, struct ftrace_regs *fregs);
#define ftrace_graph_func ftrace_graph_func

#endif /* __ASSEMBLER__ */

Annotation

Implementation Notes