arch/loongarch/include/asm/ftrace.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright (C) 2022 Loongson Technology Corporation Limited
   4  */
   5
   6 #ifndef _ASM_LOONGARCH_FTRACE_H
   7 #define _ASM_LOONGARCH_FTRACE_H
   8
   9 #define FTRACE_PLT_IDX          0
  10 #define FTRACE_REGS_PLT_IDX     1
  11 #define NR_FTRACE_PLTS          2
  12
  13 #ifdef CONFIG_FUNCTION_TRACER
  14
  15 #define MCOUNT_INSN_SIZE 4              /* sizeof mcount call */
  16
  17 #ifndef __ASSEMBLY__
  18
  19 #ifndef CONFIG_DYNAMIC_FTRACE
  20
  21 #define mcount _mcount
  22 extern void _mcount(void);
  23 extern void prepare_ftrace_return(unsigned long self_addr, unsigned long callsite_sp, unsigned long old);
  24
  25 #else
  26
  27 struct dyn_ftrace;
  28 struct dyn_arch_ftrace { };
  29
  30 #define ARCH_SUPPORTS_FTRACE_OPS 1
  31
  32 #define ftrace_init_nop ftrace_init_nop
  33 int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec);
  34
  35 static inline unsigned long ftrace_call_adjust(unsigned long addr)
  36 {
  37         return addr;
  38 }
  39
  40 void prepare_ftrace_return(unsigned long self_addr, unsigned long *parent);
  41
  42 #endif /* CONFIG_DYNAMIC_FTRACE */
  43
  44 #ifdef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS
  45 struct ftrace_ops;
  46
  47 #include <linux/ftrace_regs.h>
  48
  49 static __always_inline struct pt_regs *arch_ftrace_get_regs(struct ftrace_regs *fregs)
  50 {
  51         return &arch_ftrace_regs(fregs)->regs;
  52 }
  53
  54 static __always_inline void
  55 ftrace_regs_set_instruction_pointer(struct ftrace_regs *fregs, unsigned long ip)
  56 {
  57         instruction_pointer_set(&arch_ftrace_regs(fregs)->regs, ip);
  58 }
  59
  60 #define ftrace_graph_func ftrace_graph_func
  61 void ftrace_graph_func(unsigned long ip, unsigned long parent_ip,
  62                        struct ftrace_ops *op, struct ftrace_regs *fregs);
  63
  64 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
  65 static inline void
  66 __arch_ftrace_set_direct_caller(struct pt_regs *regs, unsigned long addr)
  67 {
  68         regs->regs[13] = addr;  /* t1 */
  69 }
  70
  71 #define arch_ftrace_set_direct_caller(fregs, addr) \
  72         __arch_ftrace_set_direct_caller(&arch_ftrace_regs(fregs)->regs, addr)
  73 #endif /* CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS */
  74
  75 #endif
  76
  77 #endif /* __ASSEMBLY__ */
  78
  79 #endif /* CONFIG_FUNCTION_TRACER */
  80
  81 #ifndef __ASSEMBLY__
  82 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
  83 struct fgraph_ret_regs {
  84         /* a0 - a1 */
  85         unsigned long regs[2];
  86
  87         unsigned long fp;
  88         unsigned long __unused;
  89 };
  90
  91 static inline unsigned long fgraph_ret_regs_return_value(struct fgraph_ret_regs *ret_regs)
  92 {
  93         return ret_regs->regs[0];
  94 }
  95
  96 static inline unsigned long fgraph_ret_regs_frame_pointer(struct fgraph_ret_regs *ret_regs)
  97 {
  98         return ret_regs->fp;
  99 }
 100 #endif /* ifdef CONFIG_FUNCTION_GRAPH_TRACER */
 101 #endif
 102
 103 #endif /* _ASM_LOONGARCH_FTRACE_H */