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 24 long lp_start, lp_end, lp_count; 25 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 32 long r12, r11, r10, r9, r8, r7, r6, r5, r4, r3, r2, r1, r0; 33 34 long sp; /* user/kernel sp depending on where we came from */ 35 long orig_r0; 36 37 /* 38 * To distinguish bet excp, syscall, irq 39 * For traps and exceptions, Exception Cause Register. 40 * ECR: <00> <VV> <CC> <PP> 41 * Last word used by Linux for extra state mgmt (syscall-restart) 42 * For interrupts, use artificial ECR values to note current prio-level 43 */ 44 union { 45 struct { 46 #ifdef CONFIG_CPU_BIG_ENDIAN 47 unsigned long state:8, ecr_vec:8, 48 ecr_cause:8, ecr_param:8; 49 #else 50 unsigned long ecr_param:8, ecr_cause:8, 51 ecr_vec:8, state:8; 52 #endif 53 }; 54 unsigned long event; 55 }; 56 57 long user_r25; 58 }; 59 60 /* Callee saved registers - need to be saved only when you are scheduled out */ 61 62 struct callee_regs { 63 long r25, r24, r23, r22, r21, r20, r19, r18, r17, r16, r15, r14, r13; 64 }; 65 66 #define instruction_pointer(regs) ((regs)->ret) 67 #define profile_pc(regs) instruction_pointer(regs) 68 69 /* return 1 if user mode or 0 if kernel mode */ 70 #define user_mode(regs) (regs->status32 & STATUS_U_MASK) 71 72 #define user_stack_pointer(regs)\ 73 ({ unsigned int sp; \ 74 if (user_mode(regs)) \ 75 sp = (regs)->sp;\ 76 else \ 77 sp = -1; \ 78 sp; \ 79 }) 80 81 /* return 1 if PC in delay slot */ 82 #define delay_mode(regs) ((regs->status32 & STATUS_DE_MASK) == STATUS_DE_MASK) 83 84 #define in_syscall(regs) ((regs->ecr_vec == ECR_V_TRAP) && !regs->ecr_param) 85 #define in_brkpt_trap(regs) ((regs->ecr_vec == ECR_V_TRAP) && regs->ecr_param) 86 87 #define STATE_SCALL_RESTARTED 0x01 88 89 #define syscall_wont_restart(reg) (reg->state |= STATE_SCALL_RESTARTED) 90 #define syscall_restartable(reg) !(reg->state & STATE_SCALL_RESTARTED) 91 92 #define current_pt_regs() \ 93 ({ \ 94 /* open-coded current_thread_info() */ \ 95 register unsigned long sp asm ("sp"); \ 96 unsigned long pg_start = (sp & ~(THREAD_SIZE - 1)); \ 97 (struct pt_regs *)(pg_start + THREAD_SIZE) - 1; \ 98 }) 99 100 static inline long regs_return_value(struct pt_regs *regs) 101 { 102 return regs->r0; 103 } 104 105 #endif /* !__ASSEMBLY__ */ 106 107 #endif /* __ASM_PTRACE_H */ 108