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| 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
|---|---|
| 2 | /* |
| 3 | * Copyright (C) 2012 Regents of the University of California |
| 4 | */ |
| 5 | |
| 6 | #ifndef _ASM_RISCV_PTRACE_H |
| 7 | #define _ASM_RISCV_PTRACE_H |
| 8 | |
| 9 | #include <uapi/asm/ptrace.h> |
| 10 | #include <asm/csr.h> |
| 11 | #include <linux/compiler.h> |
| 12 | |
| 13 | #ifndef __ASSEMBLER__ |
| 14 | |
| 15 | struct pt_regs { |
| 16 | unsigned long epc; |
| 17 | unsigned long ra; |
| 18 | unsigned long sp; |
| 19 | unsigned long gp; |
| 20 | unsigned long tp; |
| 21 | unsigned long t0; |
| 22 | unsigned long t1; |
| 23 | unsigned long t2; |
| 24 | unsigned long s0; |
| 25 | unsigned long s1; |
| 26 | struct_group(a_regs, |
| 27 | unsigned long a0; |
| 28 | unsigned long a1; |
| 29 | unsigned long a2; |
| 30 | unsigned long a3; |
| 31 | unsigned long a4; |
| 32 | unsigned long a5; |
| 33 | unsigned long a6; |
| 34 | unsigned long a7; |
| 35 | ); |
| 36 | unsigned long s2; |
| 37 | unsigned long s3; |
| 38 | unsigned long s4; |
| 39 | unsigned long s5; |
| 40 | unsigned long s6; |
| 41 | unsigned long s7; |
| 42 | unsigned long s8; |
| 43 | unsigned long s9; |
| 44 | unsigned long s10; |
| 45 | unsigned long s11; |
| 46 | unsigned long t3; |
| 47 | unsigned long t4; |
| 48 | unsigned long t5; |
| 49 | unsigned long t6; |
| 50 | /* Supervisor/Machine CSRs */ |
| 51 | unsigned long status; |
| 52 | unsigned long badaddr; |
| 53 | unsigned long cause; |
| 54 | /* a0 value before the syscall */ |
| 55 | unsigned long orig_a0; |
| 56 | }; |
| 57 | |
| 58 | #define PTRACE_SYSEMU 0x1f |
| 59 | #define PTRACE_SYSEMU_SINGLESTEP 0x20 |
| 60 | |
| 61 | #ifdef CONFIG_64BIT |
| 62 | #define REG_FMT "%016lx" |
| 63 | #else |
| 64 | #define REG_FMT "%08lx" |
| 65 | #endif |
| 66 | |
| 67 | #define user_mode(regs) (((regs)->status & SR_PP) == 0) |
| 68 | |
| 69 | #define MAX_REG_OFFSET offsetof(struct pt_regs, orig_a0) |
| 70 | |
| 71 | /* Helpers for working with the instruction pointer */ |
| 72 | static inline unsigned long instruction_pointer(struct pt_regs *regs) |
| 73 | { |
| 74 | return regs->epc; |
| 75 | } |
| 76 | static inline void instruction_pointer_set(struct pt_regs *regs, |
| 77 | unsigned long val) |
| 78 | { |
| 79 | regs->epc = val; |
| 80 | } |
| 81 | |
| 82 | #define profile_pc(regs) instruction_pointer(regs) |
| 83 | |
| 84 | /* Helpers for working with the user stack pointer */ |
| 85 | static inline unsigned long user_stack_pointer(struct pt_regs *regs) |
| 86 | { |
| 87 | return regs->sp; |
| 88 | } |
| 89 | static inline void user_stack_pointer_set(struct pt_regs *regs, |
| 90 | unsigned long val) |
| 91 | { |
| 92 | regs->sp = val; |
| 93 | } |
| 94 | |
| 95 | /* Valid only for Kernel mode traps. */ |
| 96 | static inline unsigned long kernel_stack_pointer(struct pt_regs *regs) |
| 97 | { |
| 98 | return regs->sp; |
| 99 | } |
| 100 | |
| 101 | /* Helpers for working with the frame pointer */ |
| 102 | static inline unsigned long frame_pointer(struct pt_regs *regs) |
| 103 | { |
| 104 | return regs->s0; |
| 105 | } |
| 106 | static inline void frame_pointer_set(struct pt_regs *regs, |
| 107 | unsigned long val) |
| 108 | { |
| 109 | regs->s0 = val; |
| 110 | } |
| 111 | |
| 112 | static inline unsigned long regs_return_value(struct pt_regs *regs) |
| 113 | { |
| 114 | return regs->a0; |
| 115 | } |
| 116 | |
| 117 | static inline void regs_set_return_value(struct pt_regs *regs, |
| 118 | unsigned long val) |
| 119 | { |
| 120 | regs->a0 = val; |
| 121 | } |
| 122 | |
| 123 | extern int regs_query_register_offset(const char *name); |
| 124 | extern unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, |
| 125 | unsigned int n); |
| 126 | |
| 127 | void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr, |
| 128 | unsigned long frame_pointer); |
| 129 | |
| 130 | /** |
| 131 | * regs_get_register() - get register value from its offset |
| 132 | * @regs: pt_regs from which register value is gotten |
| 133 | * @offset: offset of the register. |
| 134 | * |
| 135 | * regs_get_register returns the value of a register whose offset from @regs. |
| 136 | * The @offset is the offset of the register in struct pt_regs. |
| 137 | * If @offset is bigger than MAX_REG_OFFSET, this returns 0. |
| 138 | */ |
| 139 | static inline unsigned long regs_get_register(struct pt_regs *regs, |
| 140 | unsigned int offset) |
| 141 | { |
| 142 | if (unlikely(offset > MAX_REG_OFFSET)) |
| 143 | return 0; |
| 144 | |
| 145 | return *(unsigned long *)((unsigned long)regs + offset); |
| 146 | } |
| 147 | |
| 148 | /** |
| 149 | * regs_get_kernel_argument() - get Nth function argument in kernel |
| 150 | * @regs: pt_regs of that context |
| 151 | * @n: function argument number (start from 0) |
| 152 | * |
| 153 | * regs_get_argument() returns @n th argument of the function call. |
| 154 | * |
| 155 | * Note you can get the parameter correctly if the function has no |
| 156 | * more than eight arguments. |
| 157 | */ |
| 158 | static inline unsigned long regs_get_kernel_argument(struct pt_regs *regs, |
| 159 | unsigned int n) |
| 160 | { |
| 161 | static const int nr_reg_arguments = 8; |
| 162 | static const unsigned int argument_offs[] = { |
| 163 | offsetof(struct pt_regs, a0), |
| 164 | offsetof(struct pt_regs, a1), |
| 165 | offsetof(struct pt_regs, a2), |
| 166 | offsetof(struct pt_regs, a3), |
| 167 | offsetof(struct pt_regs, a4), |
| 168 | offsetof(struct pt_regs, a5), |
| 169 | offsetof(struct pt_regs, a6), |
| 170 | offsetof(struct pt_regs, a7), |
| 171 | }; |
| 172 | |
| 173 | if (n < nr_reg_arguments) |
| 174 | return regs_get_register(regs, argument_offs[n]); |
| 175 | return 0; |
| 176 | } |
| 177 | |
| 178 | static __always_inline bool regs_irqs_disabled(struct pt_regs *regs) |
| 179 | { |
| 180 | return !(regs->status & SR_PIE); |
| 181 | } |
| 182 | |
| 183 | #endif /* __ASSEMBLER__ */ |
| 184 | |
| 185 | #endif /* _ASM_RISCV_PTRACE_H */ |
| 186 |
Warning: This file is not a C or C++ file. It does not have highlighting.