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 #define MAX_REG_OFFSET offsetof(struct pt_regs, ecr) 58 59 #else 60 61 struct pt_regs { 62 63 unsigned long orig_r0; 64 65 ecr_reg ecr; /* Exception Cause Reg */ 66 67 unsigned long bta; /* erbta */ 68 69 unsigned long fp; 70 unsigned long r30; 71 unsigned long r12; 72 unsigned long r26; /* gp */ 73 74 #ifdef CONFIG_ARC_HAS_ACCL_REGS 75 unsigned long r58, r59; /* ACCL/ACCH used by FPU / DSP MPY */ 76 #endif 77 #ifdef CONFIG_ARC_DSP_SAVE_RESTORE_REGS 78 unsigned long DSP_CTRL; 79 #endif 80 81 unsigned long sp; /* user/kernel sp depending on entry */ 82 83 /*------- Below list auto saved by h/w -----------*/ 84 unsigned long r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11; 85 86 unsigned long blink; 87 unsigned long lp_end, lp_start, lp_count; 88 89 unsigned long ei, ldi, jli; 90 91 unsigned long ret; 92 unsigned long status32; 93 }; 94 95 #define MAX_REG_OFFSET offsetof(struct pt_regs, status32) 96 97 #endif 98 99 /* Callee saved registers - need to be saved only when you are scheduled out */ 100 101 struct callee_regs { 102 unsigned long r25, r24, r23, r22, r21, r20, r19, r18, r17, r16, r15, r14, r13; 103 }; 104 105 #define instruction_pointer(regs) ((regs)->ret) 106 #define profile_pc(regs) instruction_pointer(regs) 107 108 /* return 1 if user mode or 0 if kernel mode */ 109 #define user_mode(regs) (regs->status32 & STATUS_U_MASK) 110 111 #define user_stack_pointer(regs)\ 112 ({ unsigned int sp; \ 113 if (user_mode(regs)) \ 114 sp = (regs)->sp;\ 115 else \ 116 sp = -1; \ 117 sp; \ 118 }) 119 120 /* return 1 if PC in delay slot */ 121 #define delay_mode(regs) ((regs->status32 & STATUS_DE_MASK) == STATUS_DE_MASK) 122 123 #define in_syscall(regs) ((regs->ecr.vec == ECR_V_TRAP) && !regs->ecr.param) 124 #define in_brkpt_trap(regs) ((regs->ecr.vec == ECR_V_TRAP) && regs->ecr.param) 125 126 #define STATE_SCALL_RESTARTED 0x01 127 128 #define syscall_wont_restart(regs) (regs->ecr.state |= STATE_SCALL_RESTARTED) 129 #define syscall_restartable(regs) !(regs->ecr.state & STATE_SCALL_RESTARTED) 130 131 #define current_pt_regs() \ 132 ({ \ 133 /* open-coded current_thread_info() */ \ 134 register unsigned long sp asm ("sp"); \ 135 unsigned long pg_start = (sp & ~(THREAD_SIZE - 1)); \ 136 (struct pt_regs *)(pg_start + THREAD_SIZE) - 1; \ 137 }) 138 139 static inline long regs_return_value(struct pt_regs *regs) 140 { 141 return (long)regs->r0; 142 } 143 144 static inline void instruction_pointer_set(struct pt_regs *regs, 145 unsigned long val) 146 { 147 instruction_pointer(regs) = val; 148 } 149 150 static inline unsigned long kernel_stack_pointer(struct pt_regs *regs) 151 { 152 return regs->sp; 153 } 154 155 extern int regs_query_register_offset(const char *name); 156 extern const char *regs_query_register_name(unsigned int offset); 157 extern bool regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr); 158 extern unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, 159 unsigned int n); 160 161 static inline unsigned long regs_get_register(struct pt_regs *regs, 162 unsigned int offset) 163 { 164 if (unlikely(offset > MAX_REG_OFFSET)) 165 return 0; 166 167 return *(unsigned long *)((unsigned long)regs + offset); 168 } 169 170 extern int syscall_trace_entry(struct pt_regs *); 171 extern void syscall_trace_exit(struct pt_regs *); 172 173 #endif /* !__ASSEMBLY__ */ 174 175 #endif /* __ASM_PTRACE_H */ 176