2 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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.
8 * Amit Bhor, Sameer Dhavale: Codito Technologies 2004
10 #ifndef __ASM_ARC_PTRACE_H
11 #define __ASM_ARC_PTRACE_H
13 #include <uapi/asm/ptrace.h>
17 /* THE pt_regs: Defines how regs are saved during entry into kernel */
22 long bta; /* bta_l1, bta_l2, erbta */
24 long lp_start, lp_end, lp_count;
26 long status32; /* status32_l1, status32_l2, erstatus */
27 long ret; /* ilink1, ilink2 or eret */
32 long r12, r11, r10, r9, r8, r7, r6, r5, r4, r3, r2, r1, r0;
34 long sp; /* user/kernel sp depending on where we came from */
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
46 #ifdef CONFIG_CPU_BIG_ENDIAN
47 unsigned long state:8, ecr_vec:8,
48 ecr_cause:8, ecr_param:8;
50 unsigned long ecr_param:8, ecr_cause:8,
60 /* Callee saved registers - need to be saved only when you are scheduled out */
63 long r25, r24, r23, r22, r21, r20, r19, r18, r17, r16, r15, r14, r13;
66 #define instruction_pointer(regs) ((regs)->ret)
67 #define profile_pc(regs) instruction_pointer(regs)
69 /* return 1 if user mode or 0 if kernel mode */
70 #define user_mode(regs) (regs->status32 & STATUS_U_MASK)
72 #define user_stack_pointer(regs)\
74 if (user_mode(regs)) \
81 /* return 1 if PC in delay slot */
82 #define delay_mode(regs) ((regs->status32 & STATUS_DE_MASK) == STATUS_DE_MASK)
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)
87 #define STATE_SCALL_RESTARTED 0x01
89 #define syscall_wont_restart(reg) (reg->state |= STATE_SCALL_RESTARTED)
90 #define syscall_restartable(reg) !(reg->state & STATE_SCALL_RESTARTED)
92 #define current_pt_regs() \
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; \
100 static inline long regs_return_value(struct pt_regs *regs)
105 #endif /* !__ASSEMBLY__ */
107 #endif /* __ASM_PTRACE_H */