summaryrefslogtreecommitdiffstats
path: root/arch/s390/kernel/process.c
blob: 2bba7df4ac519fdc773551600b8bab2b9fef4789 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
/*
 * This file handles the architecture dependent parts of process handling.
 *
 *    Copyright IBM Corp. 1999, 2009
 *    Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>,
 *		 Hartmut Penner <hp@de.ibm.com>,
 *		 Denis Joseph Barrow,
 */

#include <linux/compiler.h>
#include <linux/cpu.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/elfcore.h>
#include <linux/smp.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/tick.h>
#include <linux/personality.h>
#include <linux/syscalls.h>
#include <linux/compat.h>
#include <linux/kprobes.h>
#include <linux/random.h>
#include <linux/module.h>
#include <linux/init_task.h>
#include <asm/io.h>
#include <asm/processor.h>
#include <asm/vtimer.h>
#include <asm/exec.h>
#include <asm/irq.h>
#include <asm/nmi.h>
#include <asm/smp.h>
#include <asm/switch_to.h>
#include <asm/runtime_instr.h>
#include "entry.h"

asmlinkage void ret_from_fork(void) asm ("ret_from_fork");

/* FPU save area for the init task */
__vector128 init_task_fpu_regs[__NUM_VXRS] __init_task_data;

/*
 * Return saved PC of a blocked thread. used in kernel/sched.
 * resume in entry.S does not create a new stack frame, it
 * just stores the registers %r6-%r15 to the frame given by
 * schedule. We want to return the address of the caller of
 * schedule, so we have to walk the backchain one time to
 * find the frame schedule() store its return address.
 */
unsigned long thread_saved_pc(struct task_struct *tsk)
{
	struct stack_frame *sf, *low, *high;

	if (!tsk || !task_stack_page(tsk))
		return 0;
	low = task_stack_page(tsk);
	high = (struct stack_frame *) task_pt_regs(tsk);
	sf = (struct stack_frame *) tsk->thread.ksp;
	if (sf <= low || sf > high)
		return 0;
	sf = (struct stack_frame *) sf->back_chain;
	if (sf <= low || sf > high)
		return 0;
	return sf->gprs[8];
}

extern void kernel_thread_starter(void);

/*
 * Free current thread data structures etc..
 */
void exit_thread(void)
{
	exit_thread_runtime_instr();
}

void flush_thread(void)
{
}

void release_thread(struct task_struct *dead_task)
{
}

void arch_release_task_struct(struct task_struct *tsk)
{
	/* Free either the floating-point or the vector register save area */
	kfree(tsk->thread.fpu.regs);
}

int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
{
	size_t fpu_regs_size;

	*dst = *src;

	/*
	 * If the vector extension is available, it is enabled for all tasks,
	 * and, thus, the FPU register save area must be allocated accordingly.
	 */
	fpu_regs_size = MACHINE_HAS_VX ? sizeof(__vector128) * __NUM_VXRS
				       : sizeof(freg_t) * __NUM_FPRS;
	dst->thread.fpu.regs = kzalloc(fpu_regs_size, GFP_KERNEL|__GFP_REPEAT);
	if (!dst->thread.fpu.regs)
		return -ENOMEM;

	/*
	 * Save the floating-point or vector register state of the current
	 * task and set the CIF_FPU flag to lazy restore the FPU register
	 * state when returning to user space.
	 */
	save_fpu_regs();
	dst->thread.fpu.fpc = current->thread.fpu.fpc;
	memcpy(dst->thread.fpu.regs, current->thread.fpu.regs, fpu_regs_size);

	return 0;
}

int copy_thread(unsigned long clone_flags, unsigned long new_stackp,
		unsigned long arg, struct task_struct *p)
{
	struct thread_info *ti;
	struct fake_frame
	{
		struct stack_frame sf;
		struct pt_regs childregs;
	} *frame;

	frame = container_of(task_pt_regs(p), struct fake_frame, childregs);
	p->thread.ksp = (unsigned long) frame;
	/* Save access registers to new thread structure. */
	save_access_regs(&p->thread.acrs[0]);
	/* start new process with ar4 pointing to the correct address space */
	p->thread.mm_segment = get_fs();
	/* Don't copy debug registers */
	memset(&p->thread.per_user, 0, sizeof(p->thread.per_user));
	memset(&p->thread.per_event, 0, sizeof(p->thread.per_event));
	clear_tsk_thread_flag(p, TIF_SINGLE_STEP);
	/* Initialize per thread user and system timer values */
	ti = task_thread_info(p);
	ti->user_timer = 0;
	ti->system_timer = 0;

	frame->sf.back_chain = 0;
	/* new return point is ret_from_fork */
	frame->sf.gprs[8] = (unsigned long) ret_from_fork;
	/* fake return stack for resume(), don't go back to schedule */
	frame->sf.gprs[9] = (unsigned long) frame;

	/* Store access registers to kernel stack of new process. */
	if (unlikely(p->flags & PF_KTHREAD)) {
		/* kernel thread */
		memset(&frame->childregs, 0, sizeof(struct pt_regs));
		frame->childregs.psw.mask = PSW_KERNEL_BITS | PSW_MASK_DAT |
				PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
		frame->childregs.psw.addr =
				(unsigned long) kernel_thread_starter;
		frame->childregs.gprs[9] = new_stackp; /* function */
		frame->childregs.gprs[10] = arg;
		frame->childregs.gprs[11] = (unsigned long) do_exit;
		frame->childregs.orig_gpr2 = -1;

		return 0;
	}
	frame->childregs = *current_pt_regs();
	frame->childregs.gprs[2] = 0;	/* child returns 0 on fork. */
	frame->childregs.flags = 0;
	if (new_stackp)
		frame->childregs.gprs[15] = new_stackp;

	/* Don't copy runtime instrumentation info */
	p->thread.ri_cb = NULL;
	frame->childregs.psw.mask &= ~PSW_MASK_RI;

	/* Set a new TLS ?  */
	if (clone_flags & CLONE_SETTLS) {
		unsigned long tls = frame->childregs.gprs[6];
		if (is_compat_task()) {
			p->thread.acrs[0] = (unsigned int)tls;
		} else {
			p->thread.acrs[0] = (unsigned int)(tls >> 32);
			p->thread.acrs[1] = (unsigned int)tls;
		}
	}
	return 0;
}

asmlinkage void execve_tail(void)
{
	current->thread.fpu.fpc = 0;
	asm volatile("sfpc %0" : : "d" (0));
}

/*
 * fill in the FPU structure for a core dump.
 */
int dump_fpu (struct pt_regs * regs, s390_fp_regs *fpregs)
{
	save_fpu_regs();
	fpregs->fpc = current->thread.fpu.fpc;
	fpregs->pad = 0;
	if (MACHINE_HAS_VX)
		convert_vx_to_fp((freg_t *)&fpregs->fprs,
				 current->thread.fpu.vxrs);
	else
		memcpy(&fpregs->fprs, current->thread.fpu.fprs,
		       sizeof(fpregs->fprs));
	return 1;
}
EXPORT_SYMBOL(dump_fpu);

unsigned long get_wchan(struct task_struct *p)
{
	struct stack_frame *sf, *low, *high;
	unsigned long return_address;
	int count;

	if (!p || p == current || p->state == TASK_RUNNING || !task_stack_page(p))
		return 0;
	low = task_stack_page(p);
	high = (struct stack_frame *) task_pt_regs(p);
	sf = (struct stack_frame *) p->thread.ksp;
	if (sf <= low || sf > high)
		return 0;
	for (count = 0; count < 16; count++) {
		sf = (struct stack_frame *) sf->back_chain;
		if (sf <= low || sf > high)
			return 0;
		return_address = sf->gprs[8];
		if (!in_sched_functions(return_address))
			return return_address;
	}
	return 0;
}

unsigned long arch_align_stack(unsigned long sp)
{
	if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
		sp -= get_random_int() & ~PAGE_MASK;
	return sp & ~0xf;
}

static inline unsigned long brk_rnd(void)
{
	return (get_random_int() & BRK_RND_MASK) << PAGE_SHIFT;
}

unsigned long arch_randomize_brk(struct mm_struct *mm)
{
	unsigned long ret;

	ret = PAGE_ALIGN(mm->brk + brk_rnd());
	return (ret > mm->brk) ? ret : mm->brk;
}