ptrace.h (4649B)
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 18struct 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 unsigned long user_r25; 57}; 58 59#define MAX_REG_OFFSET offsetof(struct pt_regs, user_r25) 60 61#else 62 63struct pt_regs { 64 65 unsigned long orig_r0; 66 67 union { 68 struct { 69#ifdef CONFIG_CPU_BIG_ENDIAN 70 unsigned long state:8, ecr_vec:8, 71 ecr_cause:8, ecr_param:8; 72#else 73 unsigned long ecr_param:8, ecr_cause:8, 74 ecr_vec:8, state:8; 75#endif 76 }; 77 unsigned long event; 78 }; 79 80 unsigned long bta; /* bta_l1, bta_l2, erbta */ 81 82 unsigned long user_r25; 83 84 unsigned long r26; /* gp */ 85 unsigned long fp; 86 unsigned long sp; /* user/kernel sp depending on where we came from */ 87 88 unsigned long r12, r30; 89 90#ifdef CONFIG_ARC_HAS_ACCL_REGS 91 unsigned long r58, r59; /* ACCL/ACCH used by FPU / DSP MPY */ 92#endif 93#ifdef CONFIG_ARC_DSP_SAVE_RESTORE_REGS 94 unsigned long DSP_CTRL; 95#endif 96 97 /*------- Below list auto saved by h/w -----------*/ 98 unsigned long r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11; 99 100 unsigned long blink; 101 unsigned long lp_end, lp_start, lp_count; 102 103 unsigned long ei, ldi, jli; 104 105 unsigned long ret; 106 unsigned long status32; 107}; 108 109#define MAX_REG_OFFSET offsetof(struct pt_regs, status32) 110 111#endif 112 113/* Callee saved registers - need to be saved only when you are scheduled out */ 114 115struct callee_regs { 116 unsigned long r25, r24, r23, r22, r21, r20, r19, r18, r17, r16, r15, r14, r13; 117}; 118 119#define instruction_pointer(regs) ((regs)->ret) 120#define profile_pc(regs) instruction_pointer(regs) 121 122/* return 1 if user mode or 0 if kernel mode */ 123#define user_mode(regs) (regs->status32 & STATUS_U_MASK) 124 125#define user_stack_pointer(regs)\ 126({ unsigned int sp; \ 127 if (user_mode(regs)) \ 128 sp = (regs)->sp;\ 129 else \ 130 sp = -1; \ 131 sp; \ 132}) 133 134/* return 1 if PC in delay slot */ 135#define delay_mode(regs) ((regs->status32 & STATUS_DE_MASK) == STATUS_DE_MASK) 136 137#define in_syscall(regs) ((regs->ecr_vec == ECR_V_TRAP) && !regs->ecr_param) 138#define in_brkpt_trap(regs) ((regs->ecr_vec == ECR_V_TRAP) && regs->ecr_param) 139 140#define STATE_SCALL_RESTARTED 0x01 141 142#define syscall_wont_restart(reg) (reg->state |= STATE_SCALL_RESTARTED) 143#define syscall_restartable(reg) !(reg->state & STATE_SCALL_RESTARTED) 144 145#define current_pt_regs() \ 146({ \ 147 /* open-coded current_thread_info() */ \ 148 register unsigned long sp asm ("sp"); \ 149 unsigned long pg_start = (sp & ~(THREAD_SIZE - 1)); \ 150 (struct pt_regs *)(pg_start + THREAD_SIZE) - 1; \ 151}) 152 153static inline long regs_return_value(struct pt_regs *regs) 154{ 155 return (long)regs->r0; 156} 157 158static inline void instruction_pointer_set(struct pt_regs *regs, 159 unsigned long val) 160{ 161 instruction_pointer(regs) = val; 162} 163 164static inline unsigned long kernel_stack_pointer(struct pt_regs *regs) 165{ 166 return regs->sp; 167} 168 169extern int regs_query_register_offset(const char *name); 170extern const char *regs_query_register_name(unsigned int offset); 171extern bool regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr); 172extern unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, 173 unsigned int n); 174 175static inline unsigned long regs_get_register(struct pt_regs *regs, 176 unsigned int offset) 177{ 178 if (unlikely(offset > MAX_REG_OFFSET)) 179 return 0; 180 181 return *(unsigned long *)((unsigned long)regs + offset); 182} 183 184#endif /* !__ASSEMBLY__ */ 185 186#endif /* __ASM_PTRACE_H */