1 /* 2 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 as 6 * published by the Free Software Foundation. 7 * 8 * Amit Bhor, Sameer Dhavale: Codito Technologies 2004 9 */ 10 #ifndef __ASM_ARC_PTRACE_H 11 #define __ASM_ARC_PTRACE_H 12 13 #include <uapi/asm/ptrace.h> 14 15 #ifndef __ASSEMBLY__ 16 17 /* THE pt_regs: Defines how regs are saved during entry into kernel */ 18 19 #ifdef CONFIG_ISA_ARCOMPACT 20 struct pt_regs { 21 22 /* Real registers */ 23 unsigned long bta; /* bta_l1, bta_l2, erbta */ 24 25 unsigned long lp_start, lp_end, lp_count; 26 27 unsigned long status32; /* status32_l1, status32_l2, erstatus */ 28 unsigned long ret; /* ilink1, ilink2 or eret */ 29 unsigned long blink; 30 unsigned long fp; 31 unsigned long r26; /* gp */ 32 33 unsigned long r12, r11, r10, r9, r8, r7, r6, r5, r4, r3, r2, r1, r0; 34 35 unsigned long sp; /* User/Kernel depending on where we came from */ 36 unsigned long orig_r0; 37 38 /* 39 * To distinguish bet excp, syscall, irq 40 * For traps and exceptions, Exception Cause Register. 41 * ECR: <00> <VV> <CC> <PP> 42 * Last word used by Linux for extra state mgmt (syscall-restart) 43 * For interrupts, use artificial ECR values to note current prio-level 44 */ 45 union { 46 struct { 47 #ifdef CONFIG_CPU_BIG_ENDIAN 48 unsigned long state:8, ecr_vec:8, 49 ecr_cause:8, ecr_param:8; 50 #else 51 unsigned long ecr_param:8, ecr_cause:8, 52 ecr_vec:8, state:8; 53 #endif 54 }; 55 unsigned long event; 56 }; 57 58 unsigned long user_r25; 59 }; 60 #else 61 62 struct pt_regs { 63 64 unsigned long orig_r0; 65 66 union { 67 struct { 68 #ifdef CONFIG_CPU_BIG_ENDIAN 69 unsigned long state:8, ecr_vec:8, 70 ecr_cause:8, ecr_param:8; 71 #else 72 unsigned long ecr_param:8, ecr_cause:8, 73 ecr_vec:8, state:8; 74 #endif 75 }; 76 unsigned long event; 77 }; 78 79 unsigned long bta; /* bta_l1, bta_l2, erbta */ 80 81 unsigned long user_r25; 82 83 unsigned long r26; /* gp */ 84 unsigned long fp; 85 unsigned long sp; /* user/kernel sp depending on where we came from */ 86 87 unsigned long r12; 88 89 /*------- Below list auto saved by h/w -----------*/ 90 unsigned long r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11; 91 92 unsigned long blink; 93 unsigned long lp_end, lp_start, lp_count; 94 95 unsigned long ei, ldi, jli; 96 97 unsigned long ret; 98 unsigned long status32; 99 }; 100 101 #endif 102 103 /* Callee saved registers - need to be saved only when you are scheduled out */ 104 105 struct callee_regs { 106 unsigned long r25, r24, r23, r22, r21, r20, r19, r18, r17, r16, r15, r14, r13; 107 }; 108 109 #define instruction_pointer(regs) ((regs)->ret) 110 #define profile_pc(regs) instruction_pointer(regs) 111 112 /* return 1 if user mode or 0 if kernel mode */ 113 #define user_mode(regs) (regs->status32 & STATUS_U_MASK) 114 115 #define user_stack_pointer(regs)\ 116 ({ unsigned int sp; \ 117 if (user_mode(regs)) \ 118 sp = (regs)->sp;\ 119 else \ 120 sp = -1; \ 121 sp; \ 122 }) 123 124 /* return 1 if PC in delay slot */ 125 #define delay_mode(regs) ((regs->status32 & STATUS_DE_MASK) == STATUS_DE_MASK) 126 127 #define in_syscall(regs) ((regs->ecr_vec == ECR_V_TRAP) && !regs->ecr_param) 128 #define in_brkpt_trap(regs) ((regs->ecr_vec == ECR_V_TRAP) && regs->ecr_param) 129 130 #define STATE_SCALL_RESTARTED 0x01 131 132 #define syscall_wont_restart(reg) (reg->state |= STATE_SCALL_RESTARTED) 133 #define syscall_restartable(reg) !(reg->state & STATE_SCALL_RESTARTED) 134 135 #define current_pt_regs() \ 136 ({ \ 137 /* open-coded current_thread_info() */ \ 138 register unsigned long sp asm ("sp"); \ 139 unsigned long pg_start = (sp & ~(THREAD_SIZE - 1)); \ 140 (struct pt_regs *)(pg_start + THREAD_SIZE) - 1; \ 141 }) 142 143 static inline long regs_return_value(struct pt_regs *regs) 144 { 145 return (long)regs->r0; 146 } 147 148 #endif /* !__ASSEMBLY__ */ 149 150 #endif /* __ASM_PTRACE_H */ 151