86 lines
1.6 KiB
ArmAsm
86 lines
1.6 KiB
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/asmmacro.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 in windowed ABI
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* a10: a0 of the caller in call0 ABI
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*
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* In call0 ABI the function _mcount is called with the special ABI:
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* its argument is in a10 and all the usual argument registers (a2 - a7)
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* must be preserved in addition to callee-saved a12 - a15.
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*/
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ENTRY(_mcount)
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#if defined(__XTENSA_WINDOWED_ABI__)
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abi_entry_default
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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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abi_ret_default
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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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abi_ret_default
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#elif defined(__XTENSA_CALL0_ABI__)
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abi_entry_default
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movi a9, ftrace_trace_function
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l32i a9, a9, 0
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movi a11, ftrace_stub
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bne a9, a11, 1f
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abi_ret_default
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1: abi_entry(28)
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s32i a0, sp, 0
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s32i a2, sp, 4
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s32i a3, sp, 8
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s32i a4, sp, 12
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s32i a5, sp, 16
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s32i a6, sp, 20
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s32i a7, sp, 24
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addi a2, a10, -MCOUNT_INSN_SIZE
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callx0 a9
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l32i a0, sp, 0
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l32i a2, sp, 4
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l32i a3, sp, 8
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l32i a4, sp, 12
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l32i a5, sp, 16
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l32i a6, sp, 20
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l32i a7, sp, 24
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abi_ret(28)
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#else
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#error Unsupported Xtensa ABI
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#endif
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ENDPROC(_mcount)
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ENTRY(ftrace_stub)
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abi_entry_default
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abi_ret_default
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ENDPROC(ftrace_stub)
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