1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) 4 * 5 * Amit Bhor, Sameer Dhavale: Codito Technologies 2004 6 */ 7 #ifndef __ASM_ARC_PTRACE_H 8 #define __ASM_ARC_PTRACE_H 9 10 #include <uapi/asm/ptrace.h> 11 #include <linux/compiler.h> 12 13 #ifndef __ASSEMBLY__ 14 15 /* THE pt_regs: Defines how regs are saved during entry into kernel */ 16 17 #ifdef CONFIG_ISA_ARCOMPACT 18 struct pt_regs { 19 20 /* Real registers */ 21 unsigned long bta; /* bta_l1, bta_l2, erbta */ 22 23 unsigned long lp_start, lp_end, lp_count; 24 25 unsigned long status32; /* status32_l1, status32_l2, erstatus */ 26 unsigned long ret; /* ilink1, ilink2 or eret */ 27 unsigned long blink; 28 unsigned long fp; 29 unsigned long r26; /* gp */ 30 31 unsigned long r12, r11, r10, r9, r8, r7, r6, r5, r4, r3, r2, r1, r0; 32 33 unsigned long sp; /* User/Kernel depending on where we came from */ 34 unsigned long orig_r0; 35 36 /* 37 * To distinguish bet excp, syscall, irq 38 * For traps and exceptions, Exception Cause Register. 39 * ECR: <00> <VV> <CC> <PP> 40 * Last word used by Linux for extra state mgmt (syscall-restart) 41 * For interrupts, use artificial ECR values to note current prio-level 42 */ 43 union { 44 struct { 45 #ifdef CONFIG_CPU_BIG_ENDIAN 46 unsigned long state:8, ecr_vec:8, 47 ecr_cause:8, ecr_param:8; 48 #else 49 unsigned long ecr_param:8, ecr_cause:8, 50 ecr_vec:8, state:8; 51 #endif 52 }; 53 unsigned long event; 54 }; 55 }; 56 57 #define MAX_REG_OFFSET offsetof(struct pt_regs, event) 58 59 #else 60 61 struct pt_regs { 62 63 unsigned long orig_r0; 64 65 union { 66 struct { 67 #ifdef CONFIG_CPU_BIG_ENDIAN 68 unsigned long state:8, ecr_vec:8, 69 ecr_cause:8, ecr_param:8; 70 #else 71 unsigned long ecr_param:8, ecr_cause:8, 72 ecr_vec:8, state:8; 73 #endif 74 }; 75 unsigned long event; 76 }; 77 78 unsigned long bta; /* bta_l1, bta_l2, erbta */ 79 80 unsigned long r26; /* gp */ 81 unsigned long fp; 82 unsigned long sp; /* user/kernel sp depending on where we came from */ 83 84 unsigned long r12, r30; 85 86 #ifdef CONFIG_ARC_HAS_ACCL_REGS 87 unsigned long r58, r59; /* ACCL/ACCH used by FPU / DSP MPY */ 88 #endif 89 #ifdef CONFIG_ARC_DSP_SAVE_RESTORE_REGS 90 unsigned long DSP_CTRL; 91 #endif 92 93 /*------- Below list auto saved by h/w -----------*/ 94 unsigned long r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11; 95 96 unsigned long blink; 97 unsigned long lp_end, lp_start, lp_count; 98 99 unsigned long ei, ldi, jli; 100 101 unsigned long ret; 102 unsigned long status32; 103 }; 104 105 #define MAX_REG_OFFSET offsetof(struct pt_regs, status32) 106 107 #endif 108 109 /* Callee saved registers - need to be saved only when you are scheduled out */ 110 111 struct callee_regs { 112 unsigned long r25, r24, r23, r22, r21, r20, r19, r18, r17, r16, r15, r14, r13; 113 }; 114 115 #define instruction_pointer(regs) ((regs)->ret) 116 #define profile_pc(regs) instruction_pointer(regs) 117 118 /* return 1 if user mode or 0 if kernel mode */ 119 #define user_mode(regs) (regs->status32 & STATUS_U_MASK) 120 121 #define user_stack_pointer(regs)\ 122 ({ unsigned int sp; \ 123 if (user_mode(regs)) \ 124 sp = (regs)->sp;\ 125 else \ 126 sp = -1; \ 127 sp; \ 128 }) 129 130 /* return 1 if PC in delay slot */ 131 #define delay_mode(regs) ((regs->status32 & STATUS_DE_MASK) == STATUS_DE_MASK) 132 133 #define in_syscall(regs) ((regs->ecr_vec == ECR_V_TRAP) && !regs->ecr_param) 134 #define in_brkpt_trap(regs) ((regs->ecr_vec == ECR_V_TRAP) && regs->ecr_param) 135 136 #define STATE_SCALL_RESTARTED 0x01 137 138 #define syscall_wont_restart(reg) (reg->state |= STATE_SCALL_RESTARTED) 139 #define syscall_restartable(reg) !(reg->state & STATE_SCALL_RESTARTED) 140 141 #define current_pt_regs() \ 142 ({ \ 143 /* open-coded current_thread_info() */ \ 144 register unsigned long sp asm ("sp"); \ 145 unsigned long pg_start = (sp & ~(THREAD_SIZE - 1)); \ 146 (struct pt_regs *)(pg_start + THREAD_SIZE) - 1; \ 147 }) 148 149 static inline long regs_return_value(struct pt_regs *regs) 150 { 151 return (long)regs->r0; 152 } 153 154 static inline void instruction_pointer_set(struct pt_regs *regs, 155 unsigned long val) 156 { 157 instruction_pointer(regs) = val; 158 } 159 160 static inline unsigned long kernel_stack_pointer(struct pt_regs *regs) 161 { 162 return regs->sp; 163 } 164 165 extern int regs_query_register_offset(const char *name); 166 extern const char *regs_query_register_name(unsigned int offset); 167 extern bool regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr); 168 extern unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, 169 unsigned int n); 170 171 static inline unsigned long regs_get_register(struct pt_regs *regs, 172 unsigned int offset) 173 { 174 if (unlikely(offset > MAX_REG_OFFSET)) 175 return 0; 176 177 return *(unsigned long *)((unsigned long)regs + offset); 178 } 179 180 extern int syscall_trace_entry(struct pt_regs *); 181 extern void syscall_trace_exit(struct pt_regs *); 182 183 #endif /* !__ASSEMBLY__ */ 184 185 #endif /* __ASM_PTRACE_H */ 186