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| /* SPDX-License-Identifier: GPL-2.0 */
| // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
|
| #include <linux/linkage.h>
| #include <asm/ftrace.h>
| #include <abi/entry.h>
| #include <asm/asm-offsets.h>
|
| /*
| * 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
| stw a0, (sp, 0)
| stw a1, (sp, 4)
| stw a2, (sp, 8)
| stw a3, (sp, 12)
| stw lr, (sp, 16)
| stw r8, (sp, 20)
| .endm
|
| .macro mcount_exit
| ldw a0, (sp, 0)
| ldw a1, (sp, 4)
| ldw a2, (sp, 8)
| ldw a3, (sp, 12)
| ldw t1, (sp, 16)
| ldw r8, (sp, 20)
| ldw lr, (sp, 24)
| addi sp, 28
| jmp t1
| .endm
|
| .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
| subi sp, 152
| ldw t1, (sp, 4)
| addi sp, 152
| ldw r8, (sp, 4)
| ldw lr, (sp, 8)
| addi sp, 12
| jmp t1
| .endm
|
| .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
|
| .macro nop32_stub
| nop32
| nop32
| nop32
| .endm
|
| ENTRY(ftrace_stub)
| jmp lr
| END(ftrace_stub)
|
| #ifndef CONFIG_DYNAMIC_FTRACE
| 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
| subi a0, 4
| ldw a1, (sp, 24)
| lrw a2, function_trace_op
| ldw a2, (a2, 0)
|
| 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)
| #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)
| lrw a2, function_trace_op
| ldw a2, (a2, 0)
|
| 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 */
|
| #ifdef CONFIG_FUNCTION_GRAPH_TRACER
| ENTRY(ftrace_graph_caller)
| mov a0, sp
| addi a0, 24
| ldw a1, (sp, 16)
| subi a1, 4
| 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
|
| #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 */
|
|
