/* 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 char ftrace_graph_caller_end; extern unsigned long ftrace_plt; 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; /* * Either -mhotpatch or -mnop-mcount is used - no explicit init is required */ static inline int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec) { return 0; } #define ftrace_init_nop ftrace_init_nop 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 /* brcl 0,0 */ insn->opc = 0xc004; insn->disp = 0; #endif } static inline int is_ftrace_nop(struct ftrace_insn *insn) { #ifdef CONFIG_FUNCTION_TRACER if (insn->disp == 0) return 1; #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 } /* * 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__ */ #endif /* _ASM_S390_FTRACE_H */