diff options
| author | Max Filippov <jcmvbkbc@gmail.com> | 2013-05-24 07:02:25 +0400 |
|---|---|---|
| committer | Chris Zankel <chris@zankel.net> | 2013-07-08 01:18:57 -0700 |
| commit | 478ba61afccd3a4d7ca662cadff1d35d183fe67d (patch) | |
| tree | 9458a98aa39dba5e195241a48a4c31435a4c92e3 /arch/xtensa/kernel | |
| parent | 220f5354089b27e8eeaa8658806dabc59ce55729 (diff) | |
xtensa: add static function tracer support
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Chris Zankel <chris@zankel.net>
Diffstat (limited to 'arch/xtensa/kernel')
| -rw-r--r-- | arch/xtensa/kernel/Makefile | 1 | ||||
| -rw-r--r-- | arch/xtensa/kernel/mcount.S | 50 | ||||
| -rw-r--r-- | arch/xtensa/kernel/xtensa_ksyms.c | 4 |
3 files changed, 55 insertions, 0 deletions
diff --git a/arch/xtensa/kernel/Makefile b/arch/xtensa/kernel/Makefile index 1e7fc87a94bb..f90265ec1ccc 100644 --- a/arch/xtensa/kernel/Makefile +++ b/arch/xtensa/kernel/Makefile @@ -11,6 +11,7 @@ obj-y := align.o coprocessor.o entry.o irq.o pci-dma.o platform.o process.o \ obj-$(CONFIG_KGDB) += xtensa-stub.o obj-$(CONFIG_PCI) += pci.o obj-$(CONFIG_MODULES) += xtensa_ksyms.o module.o +obj-$(CONFIG_FUNCTION_TRACER) += mcount.o AFLAGS_head.o += -mtext-section-literals diff --git a/arch/xtensa/kernel/mcount.S b/arch/xtensa/kernel/mcount.S new file mode 100644 index 000000000000..0eeda2e4a25e --- /dev/null +++ b/arch/xtensa/kernel/mcount.S @@ -0,0 +1,50 @@ +/* + * 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/ftrace.h> + +/* + * Entry condition: + * + * a2: a0 of the caller + */ + +ENTRY(_mcount) + + entry a1, 16 + + movi a4, ftrace_trace_function + l32i a4, a4, 0 + movi a3, ftrace_stub + bne a3, a4, 1f + retw + +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 + + retw + +ENDPROC(_mcount) + +ENTRY(ftrace_stub) + entry a1, 16 + retw +ENDPROC(ftrace_stub) diff --git a/arch/xtensa/kernel/xtensa_ksyms.c b/arch/xtensa/kernel/xtensa_ksyms.c index 42c53c87c204..d8507f812f46 100644 --- a/arch/xtensa/kernel/xtensa_ksyms.c +++ b/arch/xtensa/kernel/xtensa_ksyms.c @@ -124,3 +124,7 @@ extern long common_exception_return; extern long _spill_registers; EXPORT_SYMBOL(common_exception_return); EXPORT_SYMBOL(_spill_registers); + +#ifdef CONFIG_FUNCTION_TRACER +EXPORT_SYMBOL(_mcount); +#endif |