linux/arch/csky/include/asm/ftrace.h

/* SPDX-License-Identifier: GPL-2.0 */

#ifndef __ASM_CSKY_FTRACE_H
#define __ASM_CSKY_FTRACE_H

#define MCOUNT_INSN_SIZE	14

#define HAVE_FUNCTION_GRAPH_FP_TEST

#define ARCH_SUPPORTS_FTRACE_OPS 1

#define MCOUNT_ADDR	((unsigned long)_mcount)

#ifndef __ASSEMBLY__

extern void _mcount(unsigned long);

extern void ftrace_graph_call(void);

static inline unsigned long ftrace_call_adjust(unsigned long addr)
{
	return addr;
}

struct dyn_arch_ftrace {
};

void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr,
			   unsigned long frame_pointer);

#endif /* !__ASSEMBLY__ */
#endif /* __ASM_CSKY_FTRACE_H */
csky: basic ftrace supported When gcc with -pg, it'll add _mcount stub in every function. We need implement the _mcount in kernel and ftrace depends on stackstrace. To do: call-graph, dynamic ftrace Signed-off-by: Guo Ren <ren_guo@c-sky.com> 2018-12-09 14:29:59 +08:00			`/* SPDX-License-Identifier: GPL-2.0 */`

			`#ifndef __ASM_CSKY_FTRACE_H`
			`#define __ASM_CSKY_FTRACE_H`

csky/ftrace: Add dynamic function tracer (include graph tracer) Support dynamic ftrace including dynamic graph tracer. Gcc-csky with -pg will produce call site in every function prologue and we can use these call site to hook trace function. gcc with -pg origin call site: push lr jbsr _mcount nop32 nop32 If the (callee - caller)'s offset is in range of bsr instruction, we'll modify code with: push lr bsr _mcount nop32 nop32 Else if the (callee - caller)'s offset is out of bsr instrunction, we'll modify code with: push lr movih r26, ... ori r26, ... jsr r26 (r26 is reserved for jsr link reg in csky abiv2 spec.) Signed-off-by: Guo Ren <ren_guo@c-sky.com> 2019-03-01 08:50:36 +08:00			`#define MCOUNT_INSN_SIZE 14`
csky: ftrace call graph supported. With csky-gcc -pg -mbacktrace, ftrace call graph supported. Signed-off-by: Guo Ren <ren_guo@c-sky.com> 2018-12-15 21:04:27 +08:00
			`#define HAVE_FUNCTION_GRAPH_FP_TEST`

csky: Implement ftrace with regs This patch implements FTRACE_WITH_REGS for csky, which allows a traced function's arguments (and some other registers) to be captured into a struct pt_regs, allowing these to be inspected and/or modified. Signed-off-by: Guo Ren <guoren@linux.alibaba.com> 2020-02-18 20:27:39 +08:00			`#define ARCH_SUPPORTS_FTRACE_OPS 1`

csky/ftrace: Add dynamic function tracer (include graph tracer) Support dynamic ftrace including dynamic graph tracer. Gcc-csky with -pg will produce call site in every function prologue and we can use these call site to hook trace function. gcc with -pg origin call site: push lr jbsr _mcount nop32 nop32 If the (callee - caller)'s offset is in range of bsr instruction, we'll modify code with: push lr bsr _mcount nop32 nop32 Else if the (callee - caller)'s offset is out of bsr instrunction, we'll modify code with: push lr movih r26, ... ori r26, ... jsr r26 (r26 is reserved for jsr link reg in csky abiv2 spec.) Signed-off-by: Guo Ren <ren_guo@c-sky.com> 2019-03-01 08:50:36 +08:00			`#define MCOUNT_ADDR ((unsigned long)_mcount)`

			`#ifndef __ASSEMBLY__`

			`extern void _mcount(unsigned long);`

			`extern void ftrace_graph_call(void);`

			`static inline unsigned long ftrace_call_adjust(unsigned long addr)`
			`{`
			`return addr;`
			`}`

			`struct dyn_arch_ftrace {`
			`};`
arch: add missing prepare_ftrace_return() prototypes The prototype for prepare_ftrace_return() is architecture specific and can't be in a global header. Since it's normally called from assembly, it doesn't really need a prototype, but we get a warning if it's missing: arch/csky/kernel/ftrace.c:147:6: error: no previous prototype for 'prepare_ftrace_return' [-Werror=missing-prototypes] arch/microblaze/kernel/ftrace.c:22:6: error: no previous prototype for 'prepare_ftrace_return' [-Werror=missing-prototypes] arch/mips/kernel/ftrace.c:305:6: error: no previous prototype for 'prepare_ftrace_return' [-Werror=missing-prototypes] Add the prototypes for the three architectures that don't already have one in asm/ftrace.h. Signed-off-by: Arnd Bergmann <arnd@arndb.de> 2023-08-09 12:07:56 +02:00
			`void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr,`
			`unsigned long frame_pointer);`

csky/ftrace: Add dynamic function tracer (include graph tracer) Support dynamic ftrace including dynamic graph tracer. Gcc-csky with -pg will produce call site in every function prologue and we can use these call site to hook trace function. gcc with -pg origin call site: push lr jbsr _mcount nop32 nop32 If the (callee - caller)'s offset is in range of bsr instruction, we'll modify code with: push lr bsr _mcount nop32 nop32 Else if the (callee - caller)'s offset is out of bsr instrunction, we'll modify code with: push lr movih r26, ... ori r26, ... jsr r26 (r26 is reserved for jsr link reg in csky abiv2 spec.) Signed-off-by: Guo Ren <ren_guo@c-sky.com> 2019-03-01 08:50:36 +08:00			`#endif /* !__ASSEMBLY__ */`
csky: basic ftrace supported When gcc with -pg, it'll add _mcount stub in every function. We need implement the _mcount in kernel and ftrace depends on stackstrace. To do: call-graph, dynamic ftrace Signed-off-by: Guo Ren <ren_guo@c-sky.com> 2018-12-09 14:29:59 +08:00			`#endif /* __ASM_CSKY_FTRACE_H */`