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 struct pt_regs { 20 21 /* Real registers */ 22 long bta; /* bta_l1, bta_l2, erbta */ 23 long lp_start; 24 long lp_end; 25 long lp_count; 26 long status32; /* status32_l1, status32_l2, erstatus */ 27 long ret; /* ilink1, ilink2 or eret */ 28 long blink; 29 long fp; 30 long r26; /* gp */ 31 long r12; 32 long r11; 33 long r10; 34 long r9; 35 long r8; 36 long r7; 37 long r6; 38 long r5; 39 long r4; 40 long r3; 41 long r2; 42 long r1; 43 long r0; 44 long sp; /* user/kernel sp depending on where we came from */ 45 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 union { 55 struct { 56 #ifdef CONFIG_CPU_BIG_ENDIAN 57 unsigned long state:8, ecr_vec:8, 58 ecr_cause:8, ecr_param:8; 59 #else 60 unsigned long ecr_param:8, ecr_cause:8, 61 ecr_vec:8, state:8; 62 #endif 63 }; 64 unsigned long event; 65 }; 66 67 long user_r25; 68 }; 69 70 /* Callee saved registers - need to be saved only when you are scheduled out */ 71 72 struct callee_regs { 73 long r25; 74 long r24; 75 long r23; 76 long r22; 77 long r21; 78 long r20; 79 long r19; 80 long r18; 81 long r17; 82 long r16; 83 long r15; 84 long r14; 85 long r13; 86 }; 87 88 #define instruction_pointer(regs) ((regs)->ret) 89 #define profile_pc(regs) instruction_pointer(regs) 90 91 /* return 1 if user mode or 0 if kernel mode */ 92 #define user_mode(regs) (regs->status32 & STATUS_U_MASK) 93 94 #define user_stack_pointer(regs)\ 95 ({ unsigned int sp; \ 96 if (user_mode(regs)) \ 97 sp = (regs)->sp;\ 98 else \ 99 sp = -1; \ 100 sp; \ 101 }) 102 103 /* return 1 if PC in delay slot */ 104 #define delay_mode(regs) ((regs->status32 & STATUS_DE_MASK) == STATUS_DE_MASK) 105 106 #define in_syscall(regs) ((regs->ecr_vec == ECR_V_TRAP) && !regs->ecr_param) 107 #define in_brkpt_trap(regs) ((regs->ecr_vec == ECR_V_TRAP) && regs->ecr_param) 108 109 #define STATE_SCALL_RESTARTED 0x01 110 111 #define syscall_wont_restart(reg) (reg->state |= STATE_SCALL_RESTARTED) 112 #define syscall_restartable(reg) !(reg->state & STATE_SCALL_RESTARTED) 113 114 #define current_pt_regs() \ 115 ({ \ 116 /* open-coded current_thread_info() */ \ 117 register unsigned long sp asm ("sp"); \ 118 unsigned long pg_start = (sp & ~(THREAD_SIZE - 1)); \ 119 (struct pt_regs *)(pg_start + THREAD_SIZE) - 1; \ 120 }) 121 122 static inline long regs_return_value(struct pt_regs *regs) 123 { 124 return regs->r0; 125 } 126 127 #endif /* !__ASSEMBLY__ */ 128 129 #endif /* __ASM_PTRACE_H */ 130