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51 lines
844 B
51 lines
844 B
/* |
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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 |
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*/ |
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ENTRY(_mcount) |
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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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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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