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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 01:02:30 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 01:02:30 +0000 |
| commit | 76cb841cb886eef6b3bee341a2266c76578724ad (patch) | |
| tree | f5892e5ba6cc11949952a6ce4ecbe6d516d6ce58 /arch/s390/include/asm/ftrace.h | |
| parent | Initial commit. (diff) | |
| download | linux-76cb841cb886eef6b3bee341a2266c76578724ad.tar.xz linux-76cb841cb886eef6b3bee341a2266c76578724ad.zip | |
Adding upstream version 4.19.249.upstream/4.19.249
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/s390/include/asm/ftrace.h')
| -rw-r--r-- | arch/s390/include/asm/ftrace.h | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/arch/s390/include/asm/ftrace.h b/arch/s390/include/asm/ftrace.h new file mode 100644 index 000000000..ec698fc52 --- /dev/null +++ b/arch/s390/include/asm/ftrace.h @@ -0,0 +1,86 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_S390_FTRACE_H +#define _ASM_S390_FTRACE_H + +#define ARCH_SUPPORTS_FTRACE_OPS 1 + +#if defined(CC_USING_HOTPATCH) || defined(CC_USING_NOP_MCOUNT) +#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; +extern void *ftrace_func; + +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 +#if defined(CC_USING_HOTPATCH) || defined(CC_USING_NOP_MCOUNT) + /* 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 +#if defined(CC_USING_HOTPATCH) || defined(CC_USING_NOP_MCOUNT) + 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 */ |