1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* Copyright (C) 2017 Andes Technology Corporation */
4 #ifndef _ASM_RISCV_FTRACE_H
5 #define _ASM_RISCV_FTRACE_H
8 * The graph frame test is not possible if CONFIG_FRAME_POINTER is not enabled.
9 * Check arch/riscv/kernel/mcount.S for detail.
11 #if defined(CONFIG_FUNCTION_GRAPH_TRACER) && defined(CONFIG_FRAME_POINTER)
12 #define HAVE_FUNCTION_GRAPH_FP_TEST
14 #define HAVE_FUNCTION_GRAPH_RET_ADDR_PTR
17 * Clang prior to 13 had "mcount" instead of "_mcount":
18 * https://reviews.llvm.org/D98881
20 #if defined(CONFIG_CC_IS_GCC) || CONFIG_CLANG_VERSION >= 130000
21 #define MCOUNT_NAME _mcount
23 #define MCOUNT_NAME mcount
26 #define ARCH_SUPPORTS_FTRACE_OPS 1
28 void MCOUNT_NAME(void);
29 static inline unsigned long ftrace_call_adjust(unsigned long addr)
34 struct dyn_arch_ftrace {
38 #ifdef CONFIG_DYNAMIC_FTRACE
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)
45 * Dynamic ftrace generates probes to call sites, so we must deal with
46 * both auipc and jalr at the same time.
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)
55 #define JALR_BASIC (0x000080e7)
56 #define AUIPC_BASIC (0x00000097)
57 #define NOP4 (0x00000013)
59 #define make_call(caller, callee, call) \
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)); \
67 #define to_jalr_insn(offset) \
68 (((offset & JALR_OFFSET_MASK) << JALR_SHIFT) | JALR_BASIC)
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))
76 * Let auipc+jalr be the basic *mcount unit*, so we make it 8 bytes here.
78 #define MCOUNT_INSN_SIZE 8
82 int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec);
83 #define ftrace_init_nop ftrace_init_nop
88 #endif /* _ASM_RISCV_FTRACE_H */