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linux/arch/csky/abiv2/mcount.S

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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 */
// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
#include <linux/linkage.h>
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
#include <asm/ftrace.h>
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
#include <abi/entry.h>
#include <asm/asm-offsets.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
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
/*
* csky-gcc with -pg will put the following asm after prologue:
* push r15
* jsri _mcount
*
* stack layout after mcount_enter in _mcount():
*
* current sp => 0:+-------+
* | a0-a3 | -> must save all argument regs
* +16:+-------+
* | lr | -> _mcount lr (instrumente function's pc)
* +20:+-------+
* | fp=r8 | -> instrumented function fp
* +24:+-------+
* | plr | -> instrumented function lr (parent's pc)
* +-------+
*/
.macro mcount_enter
subi sp, 24
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
stw a0, (sp, 0)
stw a1, (sp, 4)
stw a2, (sp, 8)
stw a3, (sp, 12)
stw lr, (sp, 16)
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
stw r8, (sp, 20)
.endm
.macro mcount_exit
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
ldw a0, (sp, 0)
ldw a1, (sp, 4)
ldw a2, (sp, 8)
ldw a3, (sp, 12)
ldw t1, (sp, 16)
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
ldw r8, (sp, 20)
ldw lr, (sp, 24)
addi sp, 28
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
jmp t1
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
.endm
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
.macro mcount_enter_regs
subi sp, 8
stw lr, (sp, 0)
stw r8, (sp, 4)
SAVE_REGS_FTRACE
.endm
.macro mcount_exit_regs
RESTORE_REGS_FTRACE
csky: Fixup kprobes handler couldn't change pc The "Changing Execution Path" section in the Documentation/kprobes.txt said: Since kprobes can probe into a running kernel code, it can change the register set, including instruction pointer. Signed-off-by: Guo Ren <guoren@linux.alibaba.com> Cc: Arnd Bergmann <arnd@arndb.de>
2020-07-29 00:25:23 +08:00
subi sp, 152
ldw t1, (sp, 4)
addi sp, 152
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
ldw r8, (sp, 4)
ldw lr, (sp, 8)
addi sp, 12
jmp t1
.endm
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
.macro save_return_regs
subi sp, 16
stw a0, (sp, 0)
stw a1, (sp, 4)
stw a2, (sp, 8)
stw a3, (sp, 12)
.endm
.macro restore_return_regs
mov lr, a0
ldw a0, (sp, 0)
ldw a1, (sp, 4)
ldw a2, (sp, 8)
ldw a3, (sp, 12)
addi sp, 16
.endm
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
.macro nop32_stub
nop32
nop32
nop32
.endm
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
ENTRY(ftrace_stub)
jmp lr
END(ftrace_stub)
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
#ifndef CONFIG_DYNAMIC_FTRACE
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
ENTRY(_mcount)
mcount_enter
/* r26 is link register, only used with jsri translation */
lrw r26, ftrace_trace_function
ldw r26, (r26, 0)
lrw a1, ftrace_stub
cmpne r26, a1
bf skip_ftrace
mov a0, lr
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
subi a0, 4
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
ldw a1, (sp, 24)
csky/ftrace: Fixup error when disable CONFIG_DYNAMIC_FTRACE When CONFIG_DYNAMIC_FTRACE is enabled, static ftrace will fail to boot up and compile. It's a carelessness when developing "dynamic ftrace" and "ftrace with regs". Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
2020-04-08 17:47:33 +08:00
lrw a2, function_trace_op
ldw a2, (a2, 0)
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
jsr r26
#ifndef CONFIG_FUNCTION_GRAPH_TRACER
skip_ftrace:
mcount_exit
#else
skip_ftrace:
lrw a0, ftrace_graph_return
ldw a0, (a0, 0)
lrw a1, ftrace_stub
cmpne a0, a1
bt ftrace_graph_caller
lrw a0, ftrace_graph_entry
ldw a0, (a0, 0)
lrw a1, ftrace_graph_entry_stub
cmpne a0, a1
bt ftrace_graph_caller
mcount_exit
#endif
END(_mcount)
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
#else /* CONFIG_DYNAMIC_FTRACE */
ENTRY(_mcount)
mov t1, lr
ldw lr, (sp, 0)
addi sp, 4
jmp t1
ENDPROC(_mcount)
ENTRY(ftrace_caller)
mcount_enter
ldw a0, (sp, 16)
subi a0, 4
ldw a1, (sp, 24)
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
lrw a2, function_trace_op
ldw a2, (a2, 0)
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
nop
GLOBAL(ftrace_call)
nop32_stub
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
nop
GLOBAL(ftrace_graph_call)
nop32_stub
#endif
mcount_exit
ENDPROC(ftrace_caller)
#endif /* CONFIG_DYNAMIC_FTRACE */
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
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
ENTRY(ftrace_graph_caller)
mov a0, sp
addi a0, 24
ldw a1, (sp, 16)
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
subi a1, 4
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
mov a2, r8
lrw r26, prepare_ftrace_return
jsr r26
mcount_exit
END(ftrace_graph_caller)
ENTRY(return_to_handler)
save_return_regs
mov a0, r8
jsri ftrace_return_to_handler
restore_return_regs
jmp lr
END(return_to_handler)
#endif
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
#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
ENTRY(ftrace_regs_caller)
mcount_enter_regs
lrw t1, PT_FRAME_SIZE
add t1, sp
ldw a0, (t1, 0)
subi a0, 4
ldw a1, (t1, 8)
lrw a2, function_trace_op
ldw a2, (a2, 0)
mov a3, sp
nop
GLOBAL(ftrace_regs_call)
nop32_stub
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
nop
GLOBAL(ftrace_graph_regs_call)
nop32_stub
#endif
mcount_exit_regs
ENDPROC(ftrace_regs_caller)
#endif /* CONFIG_DYNAMIC_FTRACE */
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