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