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)
				48	#endif
				49	#ifdef CONFIG_64BIT
				50	PTR_ADDIU sp, PT_SIZE
				51	#else
				52	PTR_ADDIU sp, (PT_SIZE + 8)
				53	#endif
				54	.endm
				55
				56	.macro RETURN_BACK
				57	jr ra
				58	move ra, AT
				59	.endm
				60
Wu Zhangjin	538f195	2009-11-20 20:34:32 +0800	[diff] [blame]	61	#ifdef CONFIG_DYNAMIC_FTRACE
				62
				63	NESTED(ftrace_caller, PT_SIZE, ra)
				64	.globl _mcount
				65	_mcount:
				66	b ftrace_stub
				67	nop
Wu Zhangjin	fc49a3b	2009-11-20 20:34:37 +0800	[diff] [blame]	68	lw t1, function_trace_stop
				69	bnez t1, ftrace_stub
Wu Zhangjin	538f195	2009-11-20 20:34:32 +0800	[diff] [blame]	70	nop
				71
				72	MCOUNT_SAVE_REGS
Wu Zhangjin	7326c4e	2009-11-20 20:34:38 +0800	[diff] [blame]	73	#ifdef KBUILD_MCOUNT_RA_ADDRESS
				74	PTR_S t0, PT_R12(sp) /* t0 saved the location of the return address(at) by -mmcount-ra-address */
				75	#endif
Wu Zhangjin	538f195	2009-11-20 20:34:32 +0800	[diff] [blame]	76
				77	move a0, ra /* arg1: next ip, selfaddr */
				78	.globl ftrace_call
				79	ftrace_call:
				80	nop /* a placeholder for the call to a real tracing function */
				81	move a1, AT /* arg2: the caller's next ip, parent */
				82
Wu Zhangjin	e17ff5f	2009-11-20 20:34:35 +0800	[diff] [blame]	83	#ifdef CONFIG_FUNCTION_GRAPH_TRACER
				84	.globl ftrace_graph_call
				85	ftrace_graph_call:
				86	nop
				87	nop
				88	#endif
				89
Wu Zhangjin	538f195	2009-11-20 20:34:32 +0800	[diff] [blame]	90	MCOUNT_RESTORE_REGS
				91	.globl ftrace_stub
				92	ftrace_stub:
				93	RETURN_BACK
				94	END(ftrace_caller)
				95
				96	#else /* ! CONFIG_DYNAMIC_FTRACE */
				97
Wu Zhangjin	d2bb076	2009-11-20 20:34:29 +0800	[diff] [blame]	98	NESTED(_mcount, PT_SIZE, ra)
Wu Zhangjin	fc49a3b	2009-11-20 20:34:37 +0800	[diff] [blame]	99	lw t1, function_trace_stop
				100	bnez t1, ftrace_stub
Wu Zhangjin	69a7d1b	2009-11-20 20:34:30 +0800	[diff] [blame]	101	nop
Wu Zhangjin	fc49a3b	2009-11-20 20:34:37 +0800	[diff] [blame]	102	PTR_LA t1, ftrace_stub
				103	PTR_L t2, ftrace_trace_function /* Prepare t2 for (1) */
				104	bne t1, t2, static_trace
Wu Zhangjin	d2bb076	2009-11-20 20:34:29 +0800	[diff] [blame]	105	nop
Wu Zhangjin	29c5d34	2009-11-20 20:34:34 +0800	[diff] [blame]	106
				107	#ifdef CONFIG_FUNCTION_GRAPH_TRACER
Wu Zhangjin	fc49a3b	2009-11-20 20:34:37 +0800	[diff] [blame]	108	PTR_L t3, ftrace_graph_return
				109	bne t1, t3, ftrace_graph_caller
Wu Zhangjin	29c5d34	2009-11-20 20:34:34 +0800	[diff] [blame]	110	nop
Wu Zhangjin	fc49a3b	2009-11-20 20:34:37 +0800	[diff] [blame]	111	PTR_LA t1, ftrace_graph_entry_stub
				112	PTR_L t3, ftrace_graph_entry
				113	bne t1, t3, ftrace_graph_caller
Wu Zhangjin	29c5d34	2009-11-20 20:34:34 +0800	[diff] [blame]	114	nop
				115	#endif
Wu Zhangjin	d2bb076	2009-11-20 20:34:29 +0800	[diff] [blame]	116	b ftrace_stub
				117	nop
				118
				119	static_trace:
				120	MCOUNT_SAVE_REGS
				121
				122	move a0, ra /* arg1: next ip, selfaddr */
Wu Zhangjin	fc49a3b	2009-11-20 20:34:37 +0800	[diff] [blame]	123	jalr t2 /* (1) call ftrace_trace_function /
Wu Zhangjin	d2bb076	2009-11-20 20:34:29 +0800	[diff] [blame]	124	move a1, AT /* arg2: the caller's next ip, parent */
				125
				126	MCOUNT_RESTORE_REGS
				127	.globl ftrace_stub
				128	ftrace_stub:
				129	RETURN_BACK
				130	END(_mcount)
				131
Wu Zhangjin	538f195	2009-11-20 20:34:32 +0800	[diff] [blame]	132	#endif /* ! CONFIG_DYNAMIC_FTRACE */
				133
Wu Zhangjin	29c5d34	2009-11-20 20:34:34 +0800	[diff] [blame]	134	#ifdef CONFIG_FUNCTION_GRAPH_TRACER
				135
				136	NESTED(ftrace_graph_caller, PT_SIZE, ra)
Wu Zhangjin	e17ff5f	2009-11-20 20:34:35 +0800	[diff] [blame]	137	#ifdef CONFIG_DYNAMIC_FTRACE
				138	PTR_L a1, PT_R31(sp) /* load the original ra from the stack */
Wu Zhangjin	7326c4e	2009-11-20 20:34:38 +0800	[diff] [blame]	139	#ifdef KBUILD_MCOUNT_RA_ADDRESS
				140	PTR_L t0, PT_R12(sp) /* load the original t0 from the stack */
				141	#endif
Wu Zhangjin	e17ff5f	2009-11-20 20:34:35 +0800	[diff] [blame]	142	#else
Wu Zhangjin	29c5d34	2009-11-20 20:34:34 +0800	[diff] [blame]	143	MCOUNT_SAVE_REGS
Wu Zhangjin	29c5d34	2009-11-20 20:34:34 +0800	[diff] [blame]	144	move a1, ra /* arg2: next ip, selfaddr */
Wu Zhangjin	e17ff5f	2009-11-20 20:34:35 +0800	[diff] [blame]	145	#endif
Wu Zhangjin	7326c4e	2009-11-20 20:34:38 +0800	[diff] [blame]	146
				147	#ifdef KBUILD_MCOUNT_RA_ADDRESS
				148	bnez t0, 1f /* non-leaf func: t0 saved the location of the return address */
				149	nop
				150	PTR_LA t0, PT_R1(sp) /* leaf func: get the location of at(old ra) from our own stack */
				151	1: move a0, t0 /* arg1: the location of the return address */
				152	#else
Wu Zhangjin	e17ff5f	2009-11-20 20:34:35 +0800	[diff] [blame]	153	PTR_LA a0, PT_R1(sp) /* arg1: &AT -> a0 */
Wu Zhangjin	7326c4e	2009-11-20 20:34:38 +0800	[diff] [blame]	154	#endif
Wu Zhangjin	29c5d34	2009-11-20 20:34:34 +0800	[diff] [blame]	155	jal prepare_ftrace_return
Wu Zhangjin	046199c	2009-11-20 20:34:36 +0800	[diff] [blame]	156	#ifdef CONFIG_FRAME_POINTER
Wu Zhangjin	29c5d34	2009-11-20 20:34:34 +0800	[diff] [blame]	157	move a2, fp /* arg3: frame pointer */
Wu Zhangjin	046199c	2009-11-20 20:34:36 +0800	[diff] [blame]	158	#else
				159	#ifdef CONFIG_64BIT
				160	PTR_LA a2, PT_SIZE(sp)
				161	#else
				162	PTR_LA a2, (PT_SIZE+8)(sp)
				163	#endif
				164	#endif
Wu Zhangjin	29c5d34	2009-11-20 20:34:34 +0800	[diff] [blame]	165
				166	MCOUNT_RESTORE_REGS
				167	RETURN_BACK
				168	END(ftrace_graph_caller)
				169
				170	.align 2
				171	.globl return_to_handler
				172	return_to_handler:
				173	PTR_SUBU sp, PT_SIZE
				174	PTR_S v0, PT_R2(sp)
				175
				176	jal ftrace_return_to_handler
				177	PTR_S v1, PT_R3(sp)
				178
				179	/* restore the real parent address: v0 -> ra */
				180	move ra, v0
				181
				182	PTR_L v0, PT_R2(sp)
				183	PTR_L v1, PT_R3(sp)
				184	jr ra
				185	PTR_ADDIU sp, PT_SIZE
				186	#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
				187
Wu Zhangjin	d2bb076	2009-11-20 20:34:29 +0800	[diff] [blame]	188	.set at
				189	.set reorder