1/*
2 * Copyright 2010 Tilera Corporation. All Rights Reserved.
3 *
4 *   This program is free software; you can redistribute it and/or
5 *   modify it under the terms of the GNU General Public License
6 *   as published by the Free Software Foundation, version 2.
7 *
8 *   This program is distributed in the hope that it will be useful, but
9 *   WITHOUT ANY WARRANTY; without even the implied warranty of
10 *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
11 *   NON INFRINGEMENT.  See the GNU General Public License for
12 *   more details.
13 */
14#ifndef _ASM_TILE_PTRACE_H
15#define _ASM_TILE_PTRACE_H
16
17#include <linux/compiler.h>
18
19#ifndef __ASSEMBLY__
20/* Benefit from consistent use of "long" on all chips. */
21typedef unsigned long pt_reg_t;
22#endif
23
24#include <uapi/asm/ptrace.h>
25
26#define PTRACE_O_MASK_TILE	(PTRACE_O_TRACEMIGRATE)
27#define PT_TRACE_MIGRATE	PT_EVENT_FLAG(PTRACE_EVENT_MIGRATE)
28
29/* Flag bits in pt_regs.flags */
30#define PT_FLAGS_DISABLE_IRQ    1  /* on return to kernel, disable irqs */
31#define PT_FLAGS_CALLER_SAVES   2  /* caller-save registers are valid */
32#define PT_FLAGS_RESTORE_REGS   4  /* restore callee-save regs on return */
33
34#ifndef __ASSEMBLY__
35
36#define regs_return_value(regs) ((regs)->regs[0])
37#define instruction_pointer(regs) ((regs)->pc)
38#define profile_pc(regs) instruction_pointer(regs)
39#define user_stack_pointer(regs) ((regs)->sp)
40
41/* Does the process account for user or for system time? */
42#define user_mode(regs) (EX1_PL((regs)->ex1) < KERNEL_PL)
43
44/* Fill in a struct pt_regs with the current kernel registers. */
45struct pt_regs *get_pt_regs(struct pt_regs *);
46
47/* Trace the current syscall. */
48extern int do_syscall_trace_enter(struct pt_regs *regs);
49extern void do_syscall_trace_exit(struct pt_regs *regs);
50
51#define arch_has_single_step()	(1)
52
53/*
54 * A structure for all single-stepper state.
55 *
56 * Also update defines in assembler section if it changes
57 */
58struct single_step_state {
59	/* the page to which we will write hacked-up bundles */
60	void __user *buffer;
61
62	union {
63		int flags;
64		struct {
65			unsigned long is_enabled:1, update:1, update_reg:6;
66		};
67	};
68
69	unsigned long orig_pc;		/* the original PC */
70	unsigned long next_pc;		/* return PC if no branch (PC + 1) */
71	unsigned long branch_next_pc;	/* return PC if we did branch/jump */
72	unsigned long update_value;	/* value to restore to update_target */
73};
74
75/* Single-step the instruction at regs->pc */
76extern void single_step_once(struct pt_regs *regs);
77
78/* Clean up after execve(). */
79extern void single_step_execve(void);
80
81struct task_struct;
82
83extern void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs);
84
85#ifdef __tilegx__
86/* We need this since sigval_t has a user pointer in it, for GETSIGINFO etc. */
87#define __ARCH_WANT_COMPAT_SYS_PTRACE
88#endif
89
90#endif /* !__ASSEMBLY__ */
91
92#define SINGLESTEP_STATE_MASK_IS_ENABLED      0x1
93#define SINGLESTEP_STATE_MASK_UPDATE          0x2
94#define SINGLESTEP_STATE_TARGET_LB              2
95#define SINGLESTEP_STATE_TARGET_UB              7
96
97#endif /* _ASM_TILE_PTRACE_H */
98