forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
88 lines
2.4 KiB
88 lines
2.4 KiB
/* 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 |
|
|
|
/* |
|
* Clang prior to 13 had "mcount" instead of "_mcount": |
|
* https://reviews.llvm.org/D98881 |
|
*/ |
|
#if defined(CONFIG_CC_IS_GCC) || CONFIG_CLANG_VERSION >= 130000 |
|
#define MCOUNT_NAME _mcount |
|
#else |
|
#define MCOUNT_NAME mcount |
|
#endif |
|
|
|
#define ARCH_SUPPORTS_FTRACE_OPS 1 |
|
#ifndef __ASSEMBLY__ |
|
void MCOUNT_NAME(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_NAME) |
|
#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 */
|
|
|