Blame - arch/mips/kernel/mcount.S - android_kernel_oneplus_msm8996

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Wu Zhangjin	d2bb076	2009-11-20 20:34:29 +0800	[diff] [blame]	1	/*
				2	* MIPS specific _mcount support
				3	*
				4	* This file is subject to the terms and conditions of the GNU General Public
				5	* License. See the file "COPYING" in the main directory of this archive for
				6	* more details.
				7	*
				8	* Copyright (C) 2009 Lemote Inc. & DSLab, Lanzhou University, China
Wu Zhangjin	f7a904d	2010-01-04 17:16:51 +0800	[diff] [blame]	9	* Author: Wu Zhangjin <wuzhangjin@gmail.com>
Wu Zhangjin	d2bb076	2009-11-20 20:34:29 +0800	[diff] [blame]	10	*/
				11
				12	#include <asm/regdef.h>
				13	#include <asm/stackframe.h>
				14	#include <asm/ftrace.h>
				15
				16	.text
				17	.set noreorder
				18	.set noat
				19
				20	.macro MCOUNT_SAVE_REGS
				21	PTR_SUBU sp, PT_SIZE
				22	PTR_S ra, PT_R31(sp)
				23	PTR_S AT, PT_R1(sp)
				24	PTR_S a0, PT_R4(sp)
				25	PTR_S a1, PT_R5(sp)
				26	PTR_S a2, PT_R6(sp)
				27	PTR_S a3, PT_R7(sp)
				28	#ifdef CONFIG_64BIT
				29	PTR_S a4, PT_R8(sp)
				30	PTR_S a5, PT_R9(sp)
				31	PTR_S a6, PT_R10(sp)
				32	PTR_S a7, PT_R11(sp)
				33	#endif
				34	.endm
				35
				36	.macro MCOUNT_RESTORE_REGS
				37	PTR_L ra, PT_R31(sp)
				38	PTR_L AT, PT_R1(sp)
				39	PTR_L a0, PT_R4(sp)
				40	PTR_L a1, PT_R5(sp)
				41	PTR_L a2, PT_R6(sp)
				42	PTR_L a3, PT_R7(sp)
				43	#ifdef CONFIG_64BIT
				44	PTR_L a4, PT_R8(sp)
				45	PTR_L a5, PT_R9(sp)
				46	PTR_L a6, PT_R10(sp)
				47	PTR_L a7, PT_R11(sp)
Wu Zhangjin	d2bb076	2009-11-20 20:34:29 +0800	[diff] [blame]	48	PTR_ADDIU sp, PT_SIZE
				49	#else
				50	PTR_ADDIU sp, (PT_SIZE + 8)
				51	#endif
				52	.endm
				53
				54	.macro RETURN_BACK
				55	jr ra
				56	move ra, AT
				57	.endm
				58
Wu Zhangjin	538f195	2009-11-20 20:34:32 +0800	[diff] [blame]	59	#ifdef CONFIG_DYNAMIC_FTRACE
				60
				61	NESTED(ftrace_caller, PT_SIZE, ra)
				62	.globl _mcount
				63	_mcount:
				64	b ftrace_stub
				65	nop
Wu Zhangjin	fc49a3b	2009-11-20 20:34:37 +0800	[diff] [blame]	66	lw t1, function_trace_stop
				67	bnez t1, ftrace_stub
Wu Zhangjin	538f195	2009-11-20 20:34:32 +0800	[diff] [blame]	68	nop
				69
				70	MCOUNT_SAVE_REGS
Wu Zhangjin	7326c4e	2009-11-20 20:34:38 +0800	[diff] [blame]	71	#ifdef KBUILD_MCOUNT_RA_ADDRESS
				72	PTR_S t0, PT_R12(sp) /* t0 saved the location of the return address(at) by -mmcount-ra-address */
				73	#endif
Wu Zhangjin	538f195	2009-11-20 20:34:32 +0800	[diff] [blame]	74
				75	move a0, ra /* arg1: next ip, selfaddr */
				76	.globl ftrace_call
				77	ftrace_call:
				78	nop /* a placeholder for the call to a real tracing function */
				79	move a1, AT /* arg2: the caller's next ip, parent */
				80
Wu Zhangjin	e17ff5f	2009-11-20 20:34:35 +0800	[diff] [blame]	81	#ifdef CONFIG_FUNCTION_GRAPH_TRACER
				82	.globl ftrace_graph_call
				83	ftrace_graph_call:
				84	nop
				85	nop
				86	#endif
				87
Wu Zhangjin	538f195	2009-11-20 20:34:32 +0800	[diff] [blame]	88	MCOUNT_RESTORE_REGS
				89	.globl ftrace_stub
				90	ftrace_stub:
				91	RETURN_BACK
				92	END(ftrace_caller)
				93
				94	#else /* ! CONFIG_DYNAMIC_FTRACE */
				95
Wu Zhangjin	d2bb076	2009-11-20 20:34:29 +0800	[diff] [blame]	96	NESTED(_mcount, PT_SIZE, ra)
Wu Zhangjin	fc49a3b	2009-11-20 20:34:37 +0800	[diff] [blame]	97	lw t1, function_trace_stop
				98	bnez t1, ftrace_stub
Wu Zhangjin	69a7d1b	2009-11-20 20:34:30 +0800	[diff] [blame]	99	nop
Wu Zhangjin	fc49a3b	2009-11-20 20:34:37 +0800	[diff] [blame]	100	PTR_LA t1, ftrace_stub
				101	PTR_L t2, ftrace_trace_function /* Prepare t2 for (1) */
				102	bne t1, t2, static_trace
Wu Zhangjin	d2bb076	2009-11-20 20:34:29 +0800	[diff] [blame]	103	nop
Wu Zhangjin	29c5d34	2009-11-20 20:34:34 +0800	[diff] [blame]	104
				105	#ifdef CONFIG_FUNCTION_GRAPH_TRACER
Wu Zhangjin	fc49a3b	2009-11-20 20:34:37 +0800	[diff] [blame]	106	PTR_L t3, ftrace_graph_return
				107	bne t1, t3, ftrace_graph_caller
Wu Zhangjin	29c5d34	2009-11-20 20:34:34 +0800	[diff] [blame]	108	nop
Wu Zhangjin	fc49a3b	2009-11-20 20:34:37 +0800	[diff] [blame]	109	PTR_LA t1, ftrace_graph_entry_stub
				110	PTR_L t3, ftrace_graph_entry
				111	bne t1, t3, ftrace_graph_caller
Wu Zhangjin	29c5d34	2009-11-20 20:34:34 +0800	[diff] [blame]	112	nop
				113	#endif
Wu Zhangjin	d2bb076	2009-11-20 20:34:29 +0800	[diff] [blame]	114	b ftrace_stub
				115	nop
				116
				117	static_trace:
				118	MCOUNT_SAVE_REGS
				119
				120	move a0, ra /* arg1: next ip, selfaddr */
Wu Zhangjin	fc49a3b	2009-11-20 20:34:37 +0800	[diff] [blame]	121	jalr t2 /* (1) call ftrace_trace_function /
Wu Zhangjin	d2bb076	2009-11-20 20:34:29 +0800	[diff] [blame]	122	move a1, AT /* arg2: the caller's next ip, parent */
				123
				124	MCOUNT_RESTORE_REGS
				125	.globl ftrace_stub
				126	ftrace_stub:
				127	RETURN_BACK
				128	END(_mcount)
				129
Wu Zhangjin	538f195	2009-11-20 20:34:32 +0800	[diff] [blame]	130	#endif /* ! CONFIG_DYNAMIC_FTRACE */
				131
Wu Zhangjin	29c5d34	2009-11-20 20:34:34 +0800	[diff] [blame]	132	#ifdef CONFIG_FUNCTION_GRAPH_TRACER
				133
				134	NESTED(ftrace_graph_caller, PT_SIZE, ra)
Wu Zhangjin	cbe555b	2010-05-14 19:08:27 +0800	[diff] [blame^]	135	#ifndef CONFIG_DYNAMIC_FTRACE
Wu Zhangjin	29c5d34	2009-11-20 20:34:34 +0800	[diff] [blame]	136	MCOUNT_SAVE_REGS
Wu Zhangjin	e17ff5f	2009-11-20 20:34:35 +0800	[diff] [blame]	137	#endif
Wu Zhangjin	7326c4e	2009-11-20 20:34:38 +0800	[diff] [blame]	138
Wu Zhangjin	cbe555b	2010-05-14 19:08:27 +0800	[diff] [blame^]	139	/* arg1: Get the location of the parent's return address */
Wu Zhangjin	7326c4e	2009-11-20 20:34:38 +0800	[diff] [blame]	140	#ifdef KBUILD_MCOUNT_RA_ADDRESS
Wu Zhangjin	cbe555b	2010-05-14 19:08:27 +0800	[diff] [blame^]	141	#ifdef CONFIG_DYNAMIC_FTRACE
				142	PTR_L a0, PT_R12(sp)
Wu Zhangjin	7326c4e	2009-11-20 20:34:38 +0800	[diff] [blame]	143	#else
Wu Zhangjin	cbe555b	2010-05-14 19:08:27 +0800	[diff] [blame^]	144	move a0, t0
Wu Zhangjin	7326c4e	2009-11-20 20:34:38 +0800	[diff] [blame]	145	#endif
Wu Zhangjin	cbe555b	2010-05-14 19:08:27 +0800	[diff] [blame^]	146	bnez a0, 1f /* non-leaf func: stored in t0 */
				147	nop
				148	#endif
				149	PTR_LA a0, PT_R1(sp) /* leaf func: the location in current stack */
				150	1:
				151
				152	/* arg2: Get self return address */
				153	#ifdef CONFIG_DYNAMIC_FTRACE
				154	PTR_L a1, PT_R31(sp)
Wu Zhangjin	046199c	2009-11-20 20:34:36 +0800	[diff] [blame]	155	#else
Wu Zhangjin	cbe555b	2010-05-14 19:08:27 +0800	[diff] [blame^]	156	move a1, ra
				157	#endif
				158
				159	/* arg3: Get frame pointer of current stack */
				160	#ifdef CONFIG_FRAME_POINTER
				161	move a2, fp
				162	#else /* ! CONFIG_FRAME_POINTER */
Wu Zhangjin	046199c	2009-11-20 20:34:36 +0800	[diff] [blame]	163	#ifdef CONFIG_64BIT
				164	PTR_LA a2, PT_SIZE(sp)
				165	#else
				166	PTR_LA a2, (PT_SIZE+8)(sp)
				167	#endif
				168	#endif
Wu Zhangjin	29c5d34	2009-11-20 20:34:34 +0800	[diff] [blame]	169
Wu Zhangjin	cbe555b	2010-05-14 19:08:27 +0800	[diff] [blame^]	170	jal prepare_ftrace_return
				171	nop
Wu Zhangjin	29c5d34	2009-11-20 20:34:34 +0800	[diff] [blame]	172	MCOUNT_RESTORE_REGS
				173	RETURN_BACK
				174	END(ftrace_graph_caller)
				175
				176	.align 2
				177	.globl return_to_handler
				178	return_to_handler:
				179	PTR_SUBU sp, PT_SIZE
				180	PTR_S v0, PT_R2(sp)
				181
				182	jal ftrace_return_to_handler
				183	PTR_S v1, PT_R3(sp)
				184
				185	/* restore the real parent address: v0 -> ra */
				186	move ra, v0
				187
				188	PTR_L v0, PT_R2(sp)
				189	PTR_L v1, PT_R3(sp)
				190	jr ra
				191	PTR_ADDIU sp, PT_SIZE
				192	#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
				193
Wu Zhangjin	d2bb076	2009-11-20 20:34:29 +0800	[diff] [blame]	194	.set at
				195	.set reorder