1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Copyright (C) 2012 Regents of the University of California
6 #ifndef _ASM_RISCV_PTRACE_H
7 #define _ASM_RISCV_PTRACE_H
9 #include <uapi/asm/ptrace.h>
11 #include <linux/compiler.h>
48 /* Supervisor/Machine CSRs */
50 unsigned long badaddr;
52 /* a0 value before the syscall */
53 unsigned long orig_a0;
57 #define REG_FMT "%016lx"
59 #define REG_FMT "%08lx"
62 #define user_mode(regs) (((regs)->status & SR_PP) == 0)
64 #define MAX_REG_OFFSET offsetof(struct pt_regs, orig_a0)
66 /* Helpers for working with the instruction pointer */
67 static inline unsigned long instruction_pointer(struct pt_regs *regs)
71 static inline void instruction_pointer_set(struct pt_regs *regs,
77 #define profile_pc(regs) instruction_pointer(regs)
79 /* Helpers for working with the user stack pointer */
80 static inline unsigned long user_stack_pointer(struct pt_regs *regs)
84 static inline void user_stack_pointer_set(struct pt_regs *regs,
90 /* Valid only for Kernel mode traps. */
91 static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
96 /* Helpers for working with the frame pointer */
97 static inline unsigned long frame_pointer(struct pt_regs *regs)
101 static inline void frame_pointer_set(struct pt_regs *regs,
107 static inline unsigned long regs_return_value(struct pt_regs *regs)
112 static inline void regs_set_return_value(struct pt_regs *regs,
118 extern int regs_query_register_offset(const char *name);
119 extern unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
122 void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr,
123 unsigned long frame_pointer);
124 int do_syscall_trace_enter(struct pt_regs *regs);
125 void do_syscall_trace_exit(struct pt_regs *regs);
128 * regs_get_register() - get register value from its offset
129 * @regs: pt_regs from which register value is gotten
130 * @offset: offset of the register.
132 * regs_get_register returns the value of a register whose offset from @regs.
133 * The @offset is the offset of the register in struct pt_regs.
134 * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
136 static inline unsigned long regs_get_register(struct pt_regs *regs,
139 if (unlikely(offset > MAX_REG_OFFSET))
142 return *(unsigned long *)((unsigned long)regs + offset);
146 * regs_get_kernel_argument() - get Nth function argument in kernel
147 * @regs: pt_regs of that context
148 * @n: function argument number (start from 0)
150 * regs_get_argument() returns @n th argument of the function call.
152 * Note you can get the parameter correctly if the function has no
153 * more than eight arguments.
155 static inline unsigned long regs_get_kernel_argument(struct pt_regs *regs,
158 static const int nr_reg_arguments = 8;
159 static const unsigned int argument_offs[] = {
160 offsetof(struct pt_regs, a0),
161 offsetof(struct pt_regs, a1),
162 offsetof(struct pt_regs, a2),
163 offsetof(struct pt_regs, a3),
164 offsetof(struct pt_regs, a4),
165 offsetof(struct pt_regs, a5),
166 offsetof(struct pt_regs, a6),
167 offsetof(struct pt_regs, a7),
170 if (n < nr_reg_arguments)
171 return regs_get_register(regs, argument_offs[n]);
175 #endif /* __ASSEMBLY__ */
177 #endif /* _ASM_RISCV_PTRACE_H */