[linux-2.6-block.git] / arch / arm64 / include / asm / ftrace.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * arch/arm64/include/asm/ftrace.h
 *
 * Copyright (C) 2013 Linaro Limited
 * Author: AKASHI Takahiro <takahiro.akashi@linaro.org>
 */
#ifndef __ASM_FTRACE_H
#define __ASM_FTRACE_H

#include <asm/insn.h>

#define HAVE_FUNCTION_GRAPH_FP_TEST

#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
#define ARCH_SUPPORTS_FTRACE_OPS 1
#else
#define MCOUNT_ADDR		((unsigned long)_mcount)
#endif

/* The BL at the callsite's adjusted rec->ip */
#define MCOUNT_INSN_SIZE	AARCH64_INSN_SIZE

#define FTRACE_PLT_IDX		0
#define FTRACE_REGS_PLT_IDX	1
#define NR_FTRACE_PLTS		2

/*
 * Currently, gcc tends to save the link register after the local variables
 * on the stack. This causes the max stack tracer to report the function
 * frame sizes for the wrong functions. By defining
 * ARCH_FTRACE_SHIFT_STACK_TRACER, it will tell the stack tracer to expect
 * to find the return address on the stack after the local variables have
 * been set up.
 *
 * Note, this may change in the future, and we will need to deal with that
 * if it were to happen.
 */
#define ARCH_FTRACE_SHIFT_STACK_TRACER 1

#ifndef __ASSEMBLY__
#include <linux/compat.h>

extern void _mcount(unsigned long);
extern void *return_address(unsigned int);

struct dyn_arch_ftrace {
	/* No extra data needed for arm64 */
};

extern unsigned long ftrace_graph_call;

extern void return_to_handler(void);

static inline unsigned long ftrace_call_adjust(unsigned long addr)
{
	/*
	 * Adjust addr to point at the BL in the callsite.
	 * See ftrace_init_nop() for the callsite sequence.
	 */
	if (IS_ENABLED(CONFIG_DYNAMIC_FTRACE_WITH_REGS))
		return addr + AARCH64_INSN_SIZE;
	/*
	 * addr is the address of the mcount call instruction.
	 * recordmcount does the necessary offset calculation.
	 */
	return addr;
}

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

#define ftrace_return_address(n) return_address(n)

/*
 * Because AArch32 mode does not share the same syscall table with AArch64,
 * tracing compat syscalls may result in reporting bogus syscalls or even
 * hang-up, so just do not trace them.
 * See kernel/trace/trace_syscalls.c
 *
 * x86 code says:
 * If the user really wants these, then they should use the
 * raw syscall tracepoints with filtering.
 */
#define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS
static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs)
{
	return is_compat_task();
}

#define ARCH_HAS_SYSCALL_MATCH_SYM_NAME

static inline bool arch_syscall_match_sym_name(const char *sym,
					       const char *name)
{
	/*
	 * Since all syscall functions have __arm64_ prefix, we must skip it.
	 * However, as we described above, we decided to ignore compat
	 * syscalls, so we don't care about __arm64_compat_ prefix here.
	 */
	return !strcmp(sym + 8, name);
}
#endif /* ifndef __ASSEMBLY__ */

#endif /* __ASM_FTRACE_H */
Commit	Line	Data
d2912cb1	1	/* SPDX-License-Identifier: GPL-2.0-only */
819e50e2 AT	2	/*
	3	* arch/arm64/include/asm/ftrace.h
	4	*
	5	* Copyright (C) 2013 Linaro Limited
	6	* Author: AKASHI Takahiro <takahiro.akashi@linaro.org>
819e50e2 AT	7	*/
	8	#ifndef __ASM_FTRACE_H
	9	#define __ASM_FTRACE_H
	10
	11	#include <asm/insn.h>
	12
5c176aff	13	#define HAVE_FUNCTION_GRAPH_FP_TEST
3b23e499 TD	14
	15	#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
	16	#define ARCH_SUPPORTS_FTRACE_OPS 1
	17	#else
819e50e2	18	#define MCOUNT_ADDR ((unsigned long)_mcount)
3b23e499 TD	19	#endif
	20
	21	/* The BL at the callsite's adjusted rec->ip */
819e50e2 AT	22	#define MCOUNT_INSN_SIZE AARCH64_INSN_SIZE
819e50e2 AT	23
3b23e499 TD	24	#define FTRACE_PLT_IDX 0
	25	#define FTRACE_REGS_PLT_IDX 1
	26	#define NR_FTRACE_PLTS 2
	27
f7edb451 SRV	28	/*
	29	* Currently, gcc tends to save the link register after the local variables
	30	* on the stack. This causes the max stack tracer to report the function
	31	* frame sizes for the wrong functions. By defining
	32	* ARCH_FTRACE_SHIFT_STACK_TRACER, it will tell the stack tracer to expect
	33	* to find the return address on the stack after the local variables have
	34	* been set up.
	35	*
	36	* Note, this may change in the future, and we will need to deal with that
	37	* if it were to happen.
	38	*/
	39	#define ARCH_FTRACE_SHIFT_STACK_TRACER 1
	40
819e50e2	41	#ifndef __ASSEMBLY__
055b1212 AT	42	#include <linux/compat.h>
055b1212 AT	43
819e50e2	44	extern void _mcount(unsigned long);
3711784e	45	extern void *return_address(unsigned int);
bd7d38db AT	46
	47	struct dyn_arch_ftrace {
	48	/* No extra data needed for arm64 */
	49	};
	50
	51	extern unsigned long ftrace_graph_call;
	52
20380bb3 AT	53	extern void return_to_handler(void);
20380bb3 AT	54
bd7d38db AT	55	static inline unsigned long ftrace_call_adjust(unsigned long addr)
bd7d38db AT	56	{
3b23e499 TD	57	/*
	58	* Adjust addr to point at the BL in the callsite.
	59	* See ftrace_init_nop() for the callsite sequence.
	60	*/
	61	if (IS_ENABLED(CONFIG_DYNAMIC_FTRACE_WITH_REGS))
	62	return addr + AARCH64_INSN_SIZE;
bd7d38db AT	63	/*
	64	* addr is the address of the mcount call instruction.
	65	* recordmcount does the necessary offset calculation.
	66	*/
	67	return addr;
	68	}
3711784e	69
3b23e499 TD	70	#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
	71	struct dyn_ftrace;
	72	int ftrace_init_nop(struct module mod, struct dyn_ftrace rec);
	73	#define ftrace_init_nop ftrace_init_nop
	74	#endif
	75
3711784e	76	#define ftrace_return_address(n) return_address(n)
055b1212 AT	77
	78	/*
	79	* Because AArch32 mode does not share the same syscall table with AArch64,
	80	* tracing compat syscalls may result in reporting bogus syscalls or even
	81	* hang-up, so just do not trace them.
	82	* See kernel/trace/trace_syscalls.c
	83	*
	84	* x86 code says:
ef769e32	85	* If the user really wants these, then they should use the
055b1212 AT	86	* raw syscall tracepoints with filtering.
	87	*/
	88	#define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS
	89	static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs)
	90	{
	91	return is_compat_task();
	92	}
874bfc6e MH	93
	94	#define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
	95
	96	static inline bool arch_syscall_match_sym_name(const char *sym,
	97	const char *name)
	98	{
	99	/*
	100	* Since all syscall functions have __arm64_ prefix, we must skip it.
	101	* However, as we described above, we decided to ignore compat
	102	* syscalls, so we don't care about __arm64_compat_ prefix here.
	103	*/
	104	return !strcmp(sym + 8, name);
	105	}
3711784e	106	#endif /* ifndef __ASSEMBLY__ */
819e50e2 AT	107
819e50e2 AT	108	#endif /* __ASM_FTRACE_H */