/* SPDX-License-Identifier: GPL-2.0 */ /* Copyright (C) 2017 Andes Technology Corporation */ #ifndef _ASM_RISCV_FTRACE_H #define _ASM_RISCV_FTRACE_H /* * The graph frame test is not possible if CONFIG_FRAME_POINTER is not enabled. * Check arch/riscv/kernel/mcount.S for detail. */ #if defined(CONFIG_FUNCTION_GRAPH_TRACER) && defined(CONFIG_FRAME_POINTER) #define HAVE_FUNCTION_GRAPH_FP_TEST #endif #define HAVE_FUNCTION_GRAPH_RET_ADDR_PTR #define ARCH_SUPPORTS_FTRACE_OPS 1 #ifndef __ASSEMBLY__ void _mcount(void); static inline unsigned long ftrace_call_adjust(unsigned long addr) { return addr; } struct dyn_arch_ftrace { }; #endif #ifdef CONFIG_DYNAMIC_FTRACE /* * A general call in RISC-V is a pair of insts: * 1) auipc: setting high-20 pc-related bits to ra register * 2) jalr: setting low-12 offset to ra, jump to ra, and set ra to * return address (original pc + 4) * * Dynamic ftrace generates probes to call sites, so we must deal with * both auipc and jalr at the same time. */ #define MCOUNT_ADDR ((unsigned long)_mcount) #define JALR_SIGN_MASK (0x00000800) #define JALR_OFFSET_MASK (0x00000fff) #define AUIPC_OFFSET_MASK (0xfffff000) #define AUIPC_PAD (0x00001000) #define JALR_SHIFT 20 #define JALR_BASIC (0x000080e7) #define AUIPC_BASIC (0x00000097) #define NOP4 (0x00000013) #define make_call(caller, callee, call) \ do { \ call[0] = to_auipc_insn((unsigned int)((unsigned long)callee - \ (unsigned long)caller)); \ call[1] = to_jalr_insn((unsigned int)((unsigned long)callee - \ (unsigned long)caller)); \ } while (0) #define to_jalr_insn(offset) \ (((offset & JALR_OFFSET_MASK) << JALR_SHIFT) | JALR_BASIC) #define to_auipc_insn(offset) \ ((offset & JALR_SIGN_MASK) ? \ (((offset & AUIPC_OFFSET_MASK) + AUIPC_PAD) | AUIPC_BASIC) : \ ((offset & AUIPC_OFFSET_MASK) | AUIPC_BASIC)) /* * Let auipc+jalr be the basic *mcount unit*, so we make it 8 bytes here. */ #define MCOUNT_INSN_SIZE 8 #ifndef __ASSEMBLY__ struct dyn_ftrace; int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec); #define ftrace_init_nop ftrace_init_nop #endif #endif #endif /* _ASM_RISCV_FTRACE_H */