mirror of https://gitee.com/openkylin/linux.git
51 lines
775 B
ArmAsm
51 lines
775 B
ArmAsm
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/*
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* arch/xtensa/kernel/mcount.S
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*
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* Xtensa specific mcount support
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2013 Tensilica Inc.
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*/
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#include <linux/linkage.h>
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#include <asm/ftrace.h>
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/*
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* Entry condition:
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*
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* a2: a0 of the caller
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*/
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ENTRY(_mcount)
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entry a1, 16
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movi a4, ftrace_trace_function
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l32i a4, a4, 0
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movi a3, ftrace_stub
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bne a3, a4, 1f
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retw
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1: xor a7, a2, a1
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movi a3, 0x3fffffff
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and a7, a7, a3
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xor a7, a7, a1
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xor a6, a0, a1
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and a6, a6, a3
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xor a6, a6, a1
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addi a6, a6, -MCOUNT_INSN_SIZE
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callx4 a4
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retw
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ENDPROC(_mcount)
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ENTRY(ftrace_stub)
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entry a1, 16
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retw
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ENDPROC(ftrace_stub)
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