1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* Copyright (C) 2017 Andes Technology Corporation */ 3 4 #ifndef _ASM_RISCV_FTRACE_H 5 #define _ASM_RISCV_FTRACE_H 6 7 /* 8 * The graph frame test is not possible if CONFIG_FRAME_POINTER is not enabled. 9 * Check arch/riscv/kernel/mcount.S for detail. 10 */ 11 #if defined(CONFIG_FUNCTION_GRAPH_TRACER) && defined(CONFIG_FRAME_POINTER) 12 #define HAVE_FUNCTION_GRAPH_FP_TEST 13 #endif 14 #define HAVE_FUNCTION_GRAPH_RET_ADDR_PTR 15 16 /* 17 * Clang prior to 13 had "mcount" instead of "_mcount": 18 * https://reviews.llvm.org/D98881 19 */ 20 #if defined(CONFIG_CC_IS_GCC) || CONFIG_CLANG_VERSION >= 130000 21 #define MCOUNT_NAME _mcount 22 #else 23 #define MCOUNT_NAME mcount 24 #endif 25 26 #define ARCH_SUPPORTS_FTRACE_OPS 1 27 #ifndef __ASSEMBLY__ 28 void MCOUNT_NAME(void); 29 static inline unsigned long ftrace_call_adjust(unsigned long addr) 30 { 31 return addr; 32 } 33 34 struct dyn_arch_ftrace { 35 }; 36 #endif 37 38 #ifdef CONFIG_DYNAMIC_FTRACE 39 /* 40 * A general call in RISC-V is a pair of insts: 41 * 1) auipc: setting high-20 pc-related bits to ra register 42 * 2) jalr: setting low-12 offset to ra, jump to ra, and set ra to 43 * return address (original pc + 4) 44 * 45 * Dynamic ftrace generates probes to call sites, so we must deal with 46 * both auipc and jalr at the same time. 47 */ 48 49 #define MCOUNT_ADDR ((unsigned long)MCOUNT_NAME) 50 #define JALR_SIGN_MASK (0x00000800) 51 #define JALR_OFFSET_MASK (0x00000fff) 52 #define AUIPC_OFFSET_MASK (0xfffff000) 53 #define AUIPC_PAD (0x00001000) 54 #define JALR_SHIFT 20 55 #define JALR_BASIC (0x000080e7) 56 #define AUIPC_BASIC (0x00000097) 57 #define NOP4 (0x00000013) 58 59 #define make_call(caller, callee, call) \ 60 do { \ 61 call[0] = to_auipc_insn((unsigned int)((unsigned long)callee - \ 62 (unsigned long)caller)); \ 63 call[1] = to_jalr_insn((unsigned int)((unsigned long)callee - \ 64 (unsigned long)caller)); \ 65 } while (0) 66 67 #define to_jalr_insn(offset) \ 68 (((offset & JALR_OFFSET_MASK) << JALR_SHIFT) | JALR_BASIC) 69 70 #define to_auipc_insn(offset) \ 71 ((offset & JALR_SIGN_MASK) ? \ 72 (((offset & AUIPC_OFFSET_MASK) + AUIPC_PAD) | AUIPC_BASIC) : \ 73 ((offset & AUIPC_OFFSET_MASK) | AUIPC_BASIC)) 74 75 /* 76 * Let auipc+jalr be the basic *mcount unit*, so we make it 8 bytes here. 77 */ 78 #define MCOUNT_INSN_SIZE 8 79 80 #ifndef __ASSEMBLY__ 81 struct dyn_ftrace; 82 int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec); 83 #define ftrace_init_nop ftrace_init_nop 84 #endif 85 86 #endif 87 88 #endif /* _ASM_RISCV_FTRACE_H */ 89