/* 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; 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 */