1/*
2 *    Copyright (c) 2002 Stephen Rothwell, IBM Coproration
3 *    Extracted from ptrace.c and ptrace32.c
4 *
5 * This file is subject to the terms and conditions of the GNU General
6 * Public License.  See the file README.legal in the main directory of
7 * this archive for more details.
8 */
9
10#ifndef _PPC64_PTRACE_COMMON_H
11#define _PPC64_PTRACE_COMMON_H
12
13#include <asm/system.h>
14
15/*
16 * Set of msr bits that gdb can change on behalf of a process.
17 */
18#define MSR_DEBUGCHANGE	(MSR_FE0 | MSR_SE | MSR_BE | MSR_FE1)
19
20/*
21 * Get contents of register REGNO in task TASK.
22 */
23static inline unsigned long get_reg(struct task_struct *task, int regno)
24{
25	unsigned long tmp = 0;
26
27	/*
28	 * Put the correct FP bits in, they might be wrong as a result
29	 * of our lazy FP restore.
30	 */
31	if (regno == PT_MSR) {
32		tmp = ((unsigned long *)task->thread.regs)[PT_MSR];
33		tmp |= task->thread.fpexc_mode;
34	} else if (regno < (sizeof(struct pt_regs) / sizeof(unsigned long))) {
35		tmp = ((unsigned long *)task->thread.regs)[regno];
36	}
37
38	return tmp;
39}
40
41/*
42 * Write contents of register REGNO in task TASK.
43 */
44static inline int put_reg(struct task_struct *task, int regno,
45			  unsigned long data)
46{
47	if (regno < PT_SOFTE) {
48		if (regno == PT_MSR)
49			data = (data & MSR_DEBUGCHANGE)
50				| (task->thread.regs->msr & ~MSR_DEBUGCHANGE);
51		((unsigned long *)task->thread.regs)[regno] = data;
52		return 0;
53	}
54	return -EIO;
55}
56
57static inline void set_single_step(struct task_struct *task)
58{
59	struct pt_regs *regs = task->thread.regs;
60	if (regs != NULL)
61		regs->msr |= MSR_SE;
62	set_tsk_thread_flag(task, TIF_SINGLESTEP);
63}
64
65static inline void clear_single_step(struct task_struct *task)
66{
67	struct pt_regs *regs = task->thread.regs;
68	if (regs != NULL)
69		regs->msr &= ~MSR_SE;
70	clear_tsk_thread_flag(task, TIF_SINGLESTEP);
71}
72
73#ifdef CONFIG_ALTIVEC
74/*
75 * Get/set all the altivec registers vr0..vr31, vscr, vrsave, in one go.
76 * The transfer totals 34 quadword.  Quadwords 0-31 contain the
77 * corresponding vector registers.  Quadword 32 contains the vscr as the
78 * last word (offset 12) within that quadword.  Quadword 33 contains the
79 * vrsave as the first word (offset 0) within the quadword.
80 *
81 * This definition of the VMX state is compatible with the current PPC32
82 * ptrace interface.  This allows signal handling and ptrace to use the
83 * same structures.  This also simplifies the implementation of a bi-arch
84 * (combined (32- and 64-bit) gdb.
85 */
86
87/*
88 * Get contents of AltiVec register state in task TASK
89 */
90static inline int get_vrregs(unsigned long __user *data,
91			     struct task_struct *task)
92{
93	unsigned long regsize;
94
95	/* copy AltiVec registers VR[0] .. VR[31] */
96	regsize = 32 * sizeof(vector128);
97	if (copy_to_user(data, task->thread.vr, regsize))
98		return -EFAULT;
99	data += (regsize / sizeof(unsigned long));
100
101	/* copy VSCR */
102	regsize = 1 * sizeof(vector128);
103	if (copy_to_user(data, &task->thread.vscr, regsize))
104		return -EFAULT;
105	data += (regsize / sizeof(unsigned long));
106
107	/* copy VRSAVE */
108	if (put_user(task->thread.vrsave, (u32 __user *)data))
109		return -EFAULT;
110
111	return 0;
112}
113
114/*
115 * Write contents of AltiVec register state into task TASK.
116 */
117static inline int set_vrregs(struct task_struct *task,
118			     unsigned long __user *data)
119{
120	unsigned long regsize;
121
122	/* copy AltiVec registers VR[0] .. VR[31] */
123	regsize = 32 * sizeof(vector128);
124	if (copy_from_user(task->thread.vr, data, regsize))
125		return -EFAULT;
126	data += (regsize / sizeof(unsigned long));
127
128	/* copy VSCR */
129	regsize = 1 * sizeof(vector128);
130	if (copy_from_user(&task->thread.vscr, data, regsize))
131		return -EFAULT;
132	data += (regsize / sizeof(unsigned long));
133
134	/* copy VRSAVE */
135	if (get_user(task->thread.vrsave, (u32 __user *)data))
136		return -EFAULT;
137
138	return 0;
139}
140#endif
141
142static inline int ptrace_set_debugreg(struct task_struct *task,
143				      unsigned long addr, unsigned long data)
144{
145	/* We only support one DABR and no IABRS at the moment */
146	if (addr > 0)
147		return -EINVAL;
148
149	/* The bottom 3 bits are flags */
150	if ((data & ~0x7UL) >= TASK_SIZE)
151		return -EIO;
152
153	/* Ensure translation is on */
154	if (data && !(data & DABR_TRANSLATION))
155		return -EIO;
156
157	task->thread.dabr = data;
158	return 0;
159}
160
161#endif /* _PPC64_PTRACE_COMMON_H */
162