diff options
Diffstat (limited to 'arch/s390/include/asm/ftrace.h')
| -rw-r--r-- | arch/s390/include/asm/ftrace.h | 169 |
1 files changed, 169 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..5a82b08f0 --- /dev/null +++ b/arch/s390/include/asm/ftrace.h @@ -0,0 +1,169 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_S390_FTRACE_H +#define _ASM_S390_FTRACE_H + +#define HAVE_FUNCTION_GRAPH_RET_ADDR_PTR +#define ARCH_SUPPORTS_FTRACE_OPS 1 +#define MCOUNT_INSN_SIZE 6 + +#ifndef __ASSEMBLY__ + +#ifdef CONFIG_CC_IS_CLANG +/* https://bugs.llvm.org/show_bug.cgi?id=41424 */ +#define ftrace_return_address(n) 0UL +#else +#define ftrace_return_address(n) __builtin_return_address(n) +#endif + +void ftrace_caller(void); + +extern void *ftrace_func; + +struct dyn_arch_ftrace { }; + +#define MCOUNT_ADDR 0 +#define FTRACE_ADDR ((unsigned long)ftrace_caller) + +#define KPROBE_ON_FTRACE_NOP 0 +#define KPROBE_ON_FTRACE_CALL 1 + +struct module; +struct dyn_ftrace; + +bool ftrace_need_init_nop(void); +#define ftrace_need_init_nop ftrace_need_init_nop + +int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec); +#define ftrace_init_nop ftrace_init_nop + +static inline unsigned long ftrace_call_adjust(unsigned long addr) +{ + return addr; +} + +struct ftrace_regs { + struct pt_regs regs; +}; + +static __always_inline struct pt_regs *arch_ftrace_get_regs(struct ftrace_regs *fregs) +{ + struct pt_regs *regs = &fregs->regs; + + if (test_pt_regs_flag(regs, PIF_FTRACE_FULL_REGS)) + return regs; + return NULL; +} + +#ifdef CONFIG_FUNCTION_GRAPH_TRACER +struct fgraph_ret_regs { + unsigned long gpr2; + unsigned long fp; +}; + +static __always_inline unsigned long fgraph_ret_regs_return_value(struct fgraph_ret_regs *ret_regs) +{ + return ret_regs->gpr2; +} + +static __always_inline unsigned long fgraph_ret_regs_frame_pointer(struct fgraph_ret_regs *ret_regs) +{ + return ret_regs->fp; +} +#endif /* CONFIG_FUNCTION_GRAPH_TRACER */ + +static __always_inline unsigned long +ftrace_regs_get_instruction_pointer(const struct ftrace_regs *fregs) +{ + return fregs->regs.psw.addr; +} + +static __always_inline void +ftrace_regs_set_instruction_pointer(struct ftrace_regs *fregs, + unsigned long ip) +{ + fregs->regs.psw.addr = ip; +} + +#define ftrace_regs_get_argument(fregs, n) \ + regs_get_kernel_argument(&(fregs)->regs, n) +#define ftrace_regs_get_stack_pointer(fregs) \ + kernel_stack_pointer(&(fregs)->regs) +#define ftrace_regs_return_value(fregs) \ + regs_return_value(&(fregs)->regs) +#define ftrace_regs_set_return_value(fregs, ret) \ + regs_set_return_value(&(fregs)->regs, ret) +#define ftrace_override_function_with_return(fregs) \ + override_function_with_return(&(fregs)->regs) +#define ftrace_regs_query_register_offset(name) \ + regs_query_register_offset(name) + +#ifdef CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS +/* + * When an ftrace registered caller is tracing a function that is + * also set by a register_ftrace_direct() call, it needs to be + * differentiated in the ftrace_caller trampoline. To do this, + * place the direct caller in the ORIG_GPR2 part of pt_regs. This + * tells the ftrace_caller that there's a direct caller. + */ +static inline void arch_ftrace_set_direct_caller(struct ftrace_regs *fregs, unsigned long addr) +{ + struct pt_regs *regs = &fregs->regs; + regs->orig_gpr2 = addr; +} +#endif /* CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS */ + +/* + * Even though the system call numbers are identical for s390/s390x a + * different system call table is used for compat tasks. This may lead + * to e.g. incorrect or missing trace event sysfs files. + * Therefore simply do not trace compat system calls at all. + * See kernel/trace/trace_syscalls.c. + */ +#define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS +static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs) +{ + return is_compat_task(); +} + +#define ARCH_HAS_SYSCALL_MATCH_SYM_NAME +static inline bool arch_syscall_match_sym_name(const char *sym, + const char *name) +{ + /* + * Skip __s390_ and __s390x_ prefix - due to compat wrappers + * and aliasing some symbols of 64 bit system call functions + * may get the __s390_ prefix instead of the __s390x_ prefix. + */ + return !strcmp(sym + 7, name) || !strcmp(sym + 8, name); +} + +#endif /* __ASSEMBLY__ */ + +#ifdef CONFIG_FUNCTION_TRACER + +#define FTRACE_NOP_INSN .word 0xc004, 0x0000, 0x0000 /* brcl 0,0 */ + +#ifndef CC_USING_HOTPATCH + +#define FTRACE_GEN_MCOUNT_RECORD(name) \ + .section __mcount_loc, "a", @progbits; \ + .quad name; \ + .previous; + +#else /* !CC_USING_HOTPATCH */ + +#define FTRACE_GEN_MCOUNT_RECORD(name) + +#endif /* !CC_USING_HOTPATCH */ + +#define FTRACE_GEN_NOP_ASM(name) \ + FTRACE_GEN_MCOUNT_RECORD(name) \ + FTRACE_NOP_INSN + +#else /* CONFIG_FUNCTION_TRACER */ + +#define FTRACE_GEN_NOP_ASM(name) + +#endif /* CONFIG_FUNCTION_TRACER */ + +#endif /* _ASM_S390_FTRACE_H */ |