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 res; /* Again this is not needed */ 63 long r25; 64 long r24; 65 long r23; 66 long r22; 67 long r21; 68 long r20; 69 long r19; 70 long r18; 71 long r17; 72 long r16; 73 long r15; 74 long r14; 75 long r13; 76 }; 77 78 #define instruction_pointer(regs) ((regs)->ret) 79 #define profile_pc(regs) instruction_pointer(regs) 80 81 /* return 1 if user mode or 0 if kernel mode */ 82 #define user_mode(regs) (regs->status32 & STATUS_U_MASK) 83 84 #define user_stack_pointer(regs)\ 85 ({ unsigned int sp; \ 86 if (user_mode(regs)) \ 87 sp = (regs)->sp;\ 88 else \ 89 sp = -1; \ 90 sp; \ 91 }) 92 93 /* return 1 if PC in delay slot */ 94 #define delay_mode(regs) ((regs->status32 & STATUS_DE_MASK) == STATUS_DE_MASK) 95 96 #define in_syscall(regs) (regs->event & orig_r8_IS_SCALL) 97 #define in_brkpt_trap(regs) (regs->event & orig_r8_IS_BRKPT) 98 99 #define syscall_wont_restart(regs) (regs->event |= orig_r8_IS_SCALL_RESTARTED) 100 #define syscall_restartable(regs) !(regs->event & orig_r8_IS_SCALL_RESTARTED) 101 102 #define current_pt_regs() \ 103 ({ \ 104 /* open-coded current_thread_info() */ \ 105 register unsigned long sp asm ("sp"); \ 106 unsigned long pg_start = (sp & ~(THREAD_SIZE - 1)); \ 107 (struct pt_regs *)(pg_start + THREAD_SIZE) - 1; \ 108 }) 109 110 static inline long regs_return_value(struct pt_regs *regs) 111 { 112 return regs->r0; 113 } 114 115 #endif /* !__ASSEMBLY__ */ 116 117 #define orig_r8_IS_SCALL 0x0001 118 #define orig_r8_IS_SCALL_RESTARTED 0x0002 119 #define orig_r8_IS_BRKPT 0x0004 120 #define orig_r8_IS_EXCPN 0x0008 121 #define orig_r8_IS_IRQ1 0x0010 122 #define orig_r8_IS_IRQ2 0x0020 123 124 #endif /* __ASM_PTRACE_H */ 125