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 /*to distinguish bet excp, syscall, irq */ 48 union { 49 #ifdef CONFIG_CPU_BIG_ENDIAN 50 /* so that assembly code is same for LE/BE */ 51 unsigned long orig_r8:16, event:16; 52 #else 53 unsigned long event:16, orig_r8:16; 54 #endif 55 long orig_r8_word; 56 }; 57 }; 58 59 /* Callee saved registers - need to be saved only when you are scheduled out */ 60 61 struct callee_regs { 62 long r25; 63 long r24; 64 long r23; 65 long r22; 66 long r21; 67 long r20; 68 long r19; 69 long r18; 70 long r17; 71 long r16; 72 long r15; 73 long r14; 74 long r13; 75 }; 76 77 #define instruction_pointer(regs) ((regs)->ret) 78 #define profile_pc(regs) instruction_pointer(regs) 79 80 /* return 1 if user mode or 0 if kernel mode */ 81 #define user_mode(regs) (regs->status32 & STATUS_U_MASK) 82 83 #define user_stack_pointer(regs)\ 84 ({ unsigned int sp; \ 85 if (user_mode(regs)) \ 86 sp = (regs)->sp;\ 87 else \ 88 sp = -1; \ 89 sp; \ 90 }) 91 92 /* return 1 if PC in delay slot */ 93 #define delay_mode(regs) ((regs->status32 & STATUS_DE_MASK) == STATUS_DE_MASK) 94 95 #define in_syscall(regs) (regs->event & orig_r8_IS_SCALL) 96 #define in_brkpt_trap(regs) (regs->event & orig_r8_IS_BRKPT) 97 98 #define syscall_wont_restart(regs) (regs->event |= orig_r8_IS_SCALL_RESTARTED) 99 #define syscall_restartable(regs) !(regs->event & orig_r8_IS_SCALL_RESTARTED) 100 101 #define current_pt_regs() \ 102 ({ \ 103 /* open-coded current_thread_info() */ \ 104 register unsigned long sp asm ("sp"); \ 105 unsigned long pg_start = (sp & ~(THREAD_SIZE - 1)); \ 106 (struct pt_regs *)(pg_start + THREAD_SIZE) - 1; \ 107 }) 108 109 static inline long regs_return_value(struct pt_regs *regs) 110 { 111 return regs->r0; 112 } 113 114 #endif /* !__ASSEMBLY__ */ 115 116 #define orig_r8_IS_SCALL 0x0001 117 #define orig_r8_IS_SCALL_RESTARTED 0x0002 118 #define orig_r8_IS_BRKPT 0x0004 119 #define orig_r8_IS_EXCPN 0x0008 120 #define orig_r8_IS_IRQ1 0x0010 121 #define orig_r8_IS_IRQ2 0x0020 122 123 #endif /* __ASM_PTRACE_H */ 124