From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- arch/csky/abiv2/mcount.S | 211 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 211 insertions(+) create mode 100644 arch/csky/abiv2/mcount.S (limited to 'arch/csky/abiv2/mcount.S') diff --git a/arch/csky/abiv2/mcount.S b/arch/csky/abiv2/mcount.S new file mode 100644 index 0000000000..d745e10c10 --- /dev/null +++ b/arch/csky/abiv2/mcount.S @@ -0,0 +1,211 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. + +#include +#include +#include +#include + +/* + * 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 */ -- cgit v1.2.3