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author | 2015-08-04 12:17:53 -0700 | |
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committer | 2015-08-04 15:44:42 -0700 | |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/arch/s390/include/asm/ftrace.h | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/arch/s390/include/asm/ftrace.h')
-rw-r--r-- | kernel/arch/s390/include/asm/ftrace.h | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/kernel/arch/s390/include/asm/ftrace.h b/kernel/arch/s390/include/asm/ftrace.h new file mode 100644 index 000000000..836c56290 --- /dev/null +++ b/kernel/arch/s390/include/asm/ftrace.h @@ -0,0 +1,84 @@ +#ifndef _ASM_S390_FTRACE_H +#define _ASM_S390_FTRACE_H + +#define ARCH_SUPPORTS_FTRACE_OPS 1 + +#ifdef CC_USING_HOTPATCH +#define MCOUNT_INSN_SIZE 6 +#else +#define MCOUNT_INSN_SIZE 24 +#define MCOUNT_RETURN_FIXUP 18 +#endif + +#ifndef __ASSEMBLY__ + +#define ftrace_return_address(n) __builtin_return_address(n) + +void _mcount(void); +void ftrace_caller(void); + +extern char ftrace_graph_caller_end; +extern unsigned long ftrace_plt; + +struct dyn_arch_ftrace { }; + +#define MCOUNT_ADDR ((unsigned long)_mcount) +#define FTRACE_ADDR ((unsigned long)ftrace_caller) + +#define KPROBE_ON_FTRACE_NOP 0 +#define KPROBE_ON_FTRACE_CALL 1 + +static inline unsigned long ftrace_call_adjust(unsigned long addr) +{ + return addr; +} + +struct ftrace_insn { + u16 opc; + s32 disp; +} __packed; + +static inline void ftrace_generate_nop_insn(struct ftrace_insn *insn) +{ +#ifdef CONFIG_FUNCTION_TRACER +#ifdef CC_USING_HOTPATCH + /* brcl 0,0 */ + insn->opc = 0xc004; + insn->disp = 0; +#else + /* jg .+24 */ + insn->opc = 0xc0f4; + insn->disp = MCOUNT_INSN_SIZE / 2; +#endif +#endif +} + +static inline int is_ftrace_nop(struct ftrace_insn *insn) +{ +#ifdef CONFIG_FUNCTION_TRACER +#ifdef CC_USING_HOTPATCH + if (insn->disp == 0) + return 1; +#else + if (insn->disp == MCOUNT_INSN_SIZE / 2) + return 1; +#endif +#endif + return 0; +} + +static inline void ftrace_generate_call_insn(struct ftrace_insn *insn, + unsigned long ip) +{ +#ifdef CONFIG_FUNCTION_TRACER + unsigned long target; + + /* brasl r0,ftrace_caller */ + target = is_module_addr((void *) ip) ? ftrace_plt : FTRACE_ADDR; + insn->opc = 0xc005; + insn->disp = (target - ip) / 2; +#endif +} + +#endif /* __ASSEMBLY__ */ +#endif /* _ASM_S390_FTRACE_H */ |