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 12 #ifndef __ASSEMBLY__ 13 14 /* THE pt_regs: Defines how regs are saved during entry into kernel */ 15 16 #ifdef CONFIG_ISA_ARCOMPACT 17 struct pt_regs { 18 19 #ifdef CONFIG_ARC_PLAT_EZNPS 20 unsigned long eflags; /* Extended FLAGS */ 21 unsigned long gpa1; /* General Purpose Aux */ 22 #endif 23 24 /* Real registers */ 25 unsigned long bta; /* bta_l1, bta_l2, erbta */ 26 27 unsigned long lp_start, lp_end, lp_count; 28 29 unsigned long status32; /* status32_l1, status32_l2, erstatus */ 30 unsigned long ret; /* ilink1, ilink2 or eret */ 31 unsigned long blink; 32 unsigned long fp; 33 unsigned long r26; /* gp */ 34 35 unsigned long r12, r11, r10, r9, r8, r7, r6, r5, r4, r3, r2, r1, r0; 36 37 unsigned long sp; /* User/Kernel depending on where we came from */ 38 unsigned long orig_r0; 39 40 /* 41 * To distinguish bet excp, syscall, irq 42 * For traps and exceptions, Exception Cause Register. 43 * ECR: <00> <VV> <CC> <PP> 44 * Last word used by Linux for extra state mgmt (syscall-restart) 45 * For interrupts, use artificial ECR values to note current prio-level 46 */ 47 union { 48 struct { 49 #ifdef CONFIG_CPU_BIG_ENDIAN 50 unsigned long state:8, ecr_vec:8, 51 ecr_cause:8, ecr_param:8; 52 #else 53 unsigned long ecr_param:8, ecr_cause:8, 54 ecr_vec:8, state:8; 55 #endif 56 }; 57 unsigned long event; 58 }; 59 60 unsigned long user_r25; 61 }; 62 #else 63 64 struct pt_regs { 65 66 unsigned long orig_r0; 67 68 union { 69 struct { 70 #ifdef CONFIG_CPU_BIG_ENDIAN 71 unsigned long state:8, ecr_vec:8, 72 ecr_cause:8, ecr_param:8; 73 #else 74 unsigned long ecr_param:8, ecr_cause:8, 75 ecr_vec:8, state:8; 76 #endif 77 }; 78 unsigned long event; 79 }; 80 81 unsigned long bta; /* bta_l1, bta_l2, erbta */ 82 83 unsigned long user_r25; 84 85 unsigned long r26; /* gp */ 86 unsigned long fp; 87 unsigned long sp; /* user/kernel sp depending on where we came from */ 88 89 unsigned long r12, r30; 90 91 #ifdef CONFIG_ARC_HAS_ACCL_REGS 92 unsigned long r58, r59; /* ACCL/ACCH used by FPU / DSP MPY */ 93 #endif 94 #ifdef CONFIG_ARC_DSP_SAVE_RESTORE_REGS 95 unsigned long DSP_CTRL; 96 #endif 97 98 /*------- Below list auto saved by h/w -----------*/ 99 unsigned long r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11; 100 101 unsigned long blink; 102 unsigned long lp_end, lp_start, lp_count; 103 104 unsigned long ei, ldi, jli; 105 106 unsigned long ret; 107 unsigned long status32; 108 }; 109 110 #endif 111 112 /* Callee saved registers - need to be saved only when you are scheduled out */ 113 114 struct callee_regs { 115 unsigned long r25, r24, r23, r22, r21, r20, r19, r18, r17, r16, r15, r14, r13; 116 }; 117 118 #define instruction_pointer(regs) ((regs)->ret) 119 #define profile_pc(regs) instruction_pointer(regs) 120 121 /* return 1 if user mode or 0 if kernel mode */ 122 #define user_mode(regs) (regs->status32 & STATUS_U_MASK) 123 124 #define user_stack_pointer(regs)\ 125 ({ unsigned int sp; \ 126 if (user_mode(regs)) \ 127 sp = (regs)->sp;\ 128 else \ 129 sp = -1; \ 130 sp; \ 131 }) 132 133 /* return 1 if PC in delay slot */ 134 #define delay_mode(regs) ((regs->status32 & STATUS_DE_MASK) == STATUS_DE_MASK) 135 136 #define in_syscall(regs) ((regs->ecr_vec == ECR_V_TRAP) && !regs->ecr_param) 137 #define in_brkpt_trap(regs) ((regs->ecr_vec == ECR_V_TRAP) && regs->ecr_param) 138 139 #define STATE_SCALL_RESTARTED 0x01 140 141 #define syscall_wont_restart(reg) (reg->state |= STATE_SCALL_RESTARTED) 142 #define syscall_restartable(reg) !(reg->state & STATE_SCALL_RESTARTED) 143 144 #define current_pt_regs() \ 145 ({ \ 146 /* open-coded current_thread_info() */ \ 147 register unsigned long sp asm ("sp"); \ 148 unsigned long pg_start = (sp & ~(THREAD_SIZE - 1)); \ 149 (struct pt_regs *)(pg_start + THREAD_SIZE) - 1; \ 150 }) 151 152 static inline long regs_return_value(struct pt_regs *regs) 153 { 154 return (long)regs->r0; 155 } 156 157 #endif /* !__ASSEMBLY__ */ 158 159 #endif /* __ASM_PTRACE_H */ 160