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