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Diffstat (limited to '')
| -rw-r--r-- | arch/xtensa/kernel/mcount.S | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/arch/xtensa/kernel/mcount.S b/arch/xtensa/kernel/mcount.S new file mode 100644 index 000000000..5e4619f52 --- /dev/null +++ b/arch/xtensa/kernel/mcount.S @@ -0,0 +1,51 @@ +/* + * arch/xtensa/kernel/mcount.S + * + * Xtensa specific mcount support + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 2013 Tensilica Inc. + */ + +#include <linux/linkage.h> +#include <asm/asmmacro.h> +#include <asm/ftrace.h> + +/* + * Entry condition: + * + * a2: a0 of the caller + */ + +ENTRY(_mcount) + + abi_entry_default + + movi a4, ftrace_trace_function + l32i a4, a4, 0 + movi a3, ftrace_stub + bne a3, a4, 1f + abi_ret_default + +1: xor a7, a2, a1 + movi a3, 0x3fffffff + and a7, a7, a3 + xor a7, a7, a1 + + xor a6, a0, a1 + and a6, a6, a3 + xor a6, a6, a1 + addi a6, a6, -MCOUNT_INSN_SIZE + callx4 a4 + + abi_ret_default + +ENDPROC(_mcount) + +ENTRY(ftrace_stub) + abi_entry_default + abi_ret_default +ENDPROC(ftrace_stub) |