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Commit | Line | Data |
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1da177e4 | 1 | /* |
cbdc2292 | 2 | * This file handles the architecture dependent parts of process handling. |
1da177e4 | 3 | * |
a53c8fab | 4 | * Copyright IBM Corp. 1999, 2009 |
cbdc2292 HC |
5 | * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>, |
6 | * Hartmut Penner <hp@de.ibm.com>, | |
7 | * Denis Joseph Barrow, | |
1da177e4 LT |
8 | */ |
9 | ||
1da177e4 LT |
10 | #include <linux/compiler.h> |
11 | #include <linux/cpu.h> | |
1da177e4 LT |
12 | #include <linux/sched.h> |
13 | #include <linux/kernel.h> | |
14 | #include <linux/mm.h> | |
638ad34a | 15 | #include <linux/elfcore.h> |
1da177e4 | 16 | #include <linux/smp.h> |
5a0e3ad6 | 17 | #include <linux/slab.h> |
1da177e4 | 18 | #include <linux/interrupt.h> |
5a62b192 | 19 | #include <linux/tick.h> |
9887a1fc | 20 | #include <linux/personality.h> |
26689452 | 21 | #include <linux/syscalls.h> |
3e86a8c6 | 22 | #include <linux/compat.h> |
860dba45 | 23 | #include <linux/kprobes.h> |
9887a1fc | 24 | #include <linux/random.h> |
3af6fb68 | 25 | #include <linux/module.h> |
1da177e4 LT |
26 | #include <asm/io.h> |
27 | #include <asm/processor.h> | |
27f6b416 | 28 | #include <asm/vtimer.h> |
f6e38691 | 29 | #include <asm/exec.h> |
1da177e4 | 30 | #include <asm/irq.h> |
f5daba1d | 31 | #include <asm/nmi.h> |
da7f51c1 | 32 | #include <asm/smp.h> |
a0616cde | 33 | #include <asm/switch_to.h> |
e4b8b3f3 | 34 | #include <asm/runtime_instr.h> |
a806170e | 35 | #include "entry.h" |
1da177e4 | 36 | |
94c12cc7 | 37 | asmlinkage void ret_from_fork(void) asm ("ret_from_fork"); |
1da177e4 LT |
38 | |
39 | /* | |
40 | * Return saved PC of a blocked thread. used in kernel/sched. | |
41 | * resume in entry.S does not create a new stack frame, it | |
42 | * just stores the registers %r6-%r15 to the frame given by | |
43 | * schedule. We want to return the address of the caller of | |
44 | * schedule, so we have to walk the backchain one time to | |
45 | * find the frame schedule() store its return address. | |
46 | */ | |
47 | unsigned long thread_saved_pc(struct task_struct *tsk) | |
48 | { | |
eb33c190 | 49 | struct stack_frame *sf, *low, *high; |
1da177e4 | 50 | |
eb33c190 HC |
51 | if (!tsk || !task_stack_page(tsk)) |
52 | return 0; | |
53 | low = task_stack_page(tsk); | |
54 | high = (struct stack_frame *) task_pt_regs(tsk); | |
55 | sf = (struct stack_frame *) (tsk->thread.ksp & PSW_ADDR_INSN); | |
56 | if (sf <= low || sf > high) | |
57 | return 0; | |
58 | sf = (struct stack_frame *) (sf->back_chain & PSW_ADDR_INSN); | |
59 | if (sf <= low || sf > high) | |
60 | return 0; | |
1da177e4 LT |
61 | return sf->gprs[8]; |
62 | } | |
63 | ||
7a5388de | 64 | extern void kernel_thread_starter(void); |
1da177e4 | 65 | |
1da177e4 LT |
66 | /* |
67 | * Free current thread data structures etc.. | |
68 | */ | |
69 | void exit_thread(void) | |
70 | { | |
e4b8b3f3 | 71 | exit_thread_runtime_instr(); |
1da177e4 LT |
72 | } |
73 | ||
74 | void flush_thread(void) | |
75 | { | |
1da177e4 LT |
76 | } |
77 | ||
78 | void release_thread(struct task_struct *dead_task) | |
79 | { | |
80 | } | |
81 | ||
6a039eab HB |
82 | void arch_release_task_struct(struct task_struct *tsk) |
83 | { | |
155e839a HB |
84 | /* Free either the floating-point or the vector register save area */ |
85 | kfree(tsk->thread.fpu.regs); | |
86 | } | |
87 | ||
88 | int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src) | |
89 | { | |
b5510d9b HB |
90 | size_t fpu_regs_size; |
91 | ||
155e839a HB |
92 | *dst = *src; |
93 | ||
b5510d9b HB |
94 | /* |
95 | * If the vector extension is available, it is enabled for all tasks, | |
96 | * and, thus, the FPU register save area must be allocated accordingly. | |
97 | */ | |
98 | fpu_regs_size = MACHINE_HAS_VX ? sizeof(__vector128) * __NUM_VXRS | |
99 | : sizeof(freg_t) * __NUM_FPRS; | |
100 | dst->thread.fpu.regs = kzalloc(fpu_regs_size, GFP_KERNEL|__GFP_REPEAT); | |
101 | if (!dst->thread.fpu.regs) | |
155e839a HB |
102 | return -ENOMEM; |
103 | ||
9977e886 HB |
104 | /* |
105 | * Save the floating-point or vector register state of the current | |
b5510d9b HB |
106 | * task and set the CIF_FPU flag to lazy restore the FPU register |
107 | * state when returning to user space. | |
9977e886 | 108 | */ |
d0164ee2 | 109 | save_fpu_regs(); |
9977e886 | 110 | dst->thread.fpu.fpc = current->thread.fpu.fpc; |
b5510d9b HB |
111 | memcpy(dst->thread.fpu.regs, current->thread.fpu.regs, fpu_regs_size); |
112 | ||
155e839a | 113 | return 0; |
6a039eab | 114 | } |
6a039eab | 115 | |
6f2c55b8 | 116 | int copy_thread(unsigned long clone_flags, unsigned long new_stackp, |
afa86fc4 | 117 | unsigned long arg, struct task_struct *p) |
1da177e4 | 118 | { |
5168ce2c | 119 | struct thread_info *ti; |
cbdc2292 HC |
120 | struct fake_frame |
121 | { | |
122 | struct stack_frame sf; | |
123 | struct pt_regs childregs; | |
124 | } *frame; | |
125 | ||
126 | frame = container_of(task_pt_regs(p), struct fake_frame, childregs); | |
127 | p->thread.ksp = (unsigned long) frame; | |
f9a7e025 AV |
128 | /* Save access registers to new thread structure. */ |
129 | save_access_regs(&p->thread.acrs[0]); | |
130 | /* start new process with ar4 pointing to the correct address space */ | |
131 | p->thread.mm_segment = get_fs(); | |
132 | /* Don't copy debug registers */ | |
133 | memset(&p->thread.per_user, 0, sizeof(p->thread.per_user)); | |
134 | memset(&p->thread.per_event, 0, sizeof(p->thread.per_event)); | |
135 | clear_tsk_thread_flag(p, TIF_SINGLE_STEP); | |
f9a7e025 AV |
136 | /* Initialize per thread user and system timer values */ |
137 | ti = task_thread_info(p); | |
138 | ti->user_timer = 0; | |
139 | ti->system_timer = 0; | |
1da177e4 | 140 | |
f9a7e025 | 141 | frame->sf.back_chain = 0; |
cbdc2292 HC |
142 | /* new return point is ret_from_fork */ |
143 | frame->sf.gprs[8] = (unsigned long) ret_from_fork; | |
cbdc2292 HC |
144 | /* fake return stack for resume(), don't go back to schedule */ |
145 | frame->sf.gprs[9] = (unsigned long) frame; | |
1da177e4 | 146 | |
f9a7e025 | 147 | /* Store access registers to kernel stack of new process. */ |
87f1ca8f | 148 | if (unlikely(p->flags & PF_KTHREAD)) { |
f9a7e025 AV |
149 | /* kernel thread */ |
150 | memset(&frame->childregs, 0, sizeof(struct pt_regs)); | |
e258d719 | 151 | frame->childregs.psw.mask = PSW_KERNEL_BITS | PSW_MASK_DAT | |
f9a7e025 AV |
152 | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK; |
153 | frame->childregs.psw.addr = PSW_ADDR_AMODE | | |
154 | (unsigned long) kernel_thread_starter; | |
155 | frame->childregs.gprs[9] = new_stackp; /* function */ | |
156 | frame->childregs.gprs[10] = arg; | |
157 | frame->childregs.gprs[11] = (unsigned long) do_exit; | |
158 | frame->childregs.orig_gpr2 = -1; | |
159 | ||
160 | return 0; | |
161 | } | |
87f1ca8f | 162 | frame->childregs = *current_pt_regs(); |
f9a7e025 | 163 | frame->childregs.gprs[2] = 0; /* child returns 0 on fork. */ |
d3a73acb | 164 | frame->childregs.flags = 0; |
87f1ca8f AV |
165 | if (new_stackp) |
166 | frame->childregs.gprs[15] = new_stackp; | |
1da177e4 | 167 | |
e4b8b3f3 JG |
168 | /* Don't copy runtime instrumentation info */ |
169 | p->thread.ri_cb = NULL; | |
170 | p->thread.ri_signum = 0; | |
171 | frame->childregs.psw.mask &= ~PSW_MASK_RI; | |
172 | ||
1da177e4 LT |
173 | /* Set a new TLS ? */ |
174 | if (clone_flags & CLONE_SETTLS) { | |
87f1ca8f | 175 | unsigned long tls = frame->childregs.gprs[6]; |
7757591a | 176 | if (is_compat_task()) { |
87f1ca8f | 177 | p->thread.acrs[0] = (unsigned int)tls; |
1da177e4 | 178 | } else { |
87f1ca8f AV |
179 | p->thread.acrs[0] = (unsigned int)(tls >> 32); |
180 | p->thread.acrs[1] = (unsigned int)tls; | |
1da177e4 LT |
181 | } |
182 | } | |
cbdc2292 | 183 | return 0; |
1da177e4 LT |
184 | } |
185 | ||
03ff9a23 MS |
186 | asmlinkage void execve_tail(void) |
187 | { | |
904818e2 | 188 | current->thread.fpu.fpc = 0; |
e47994dd | 189 | asm volatile("sfpc %0" : : "d" (0)); |
1da177e4 LT |
190 | } |
191 | ||
1da177e4 LT |
192 | /* |
193 | * fill in the FPU structure for a core dump. | |
194 | */ | |
195 | int dump_fpu (struct pt_regs * regs, s390_fp_regs *fpregs) | |
196 | { | |
d0164ee2 | 197 | save_fpu_regs(); |
9977e886 HB |
198 | fpregs->fpc = current->thread.fpu.fpc; |
199 | fpregs->pad = 0; | |
b5510d9b | 200 | if (MACHINE_HAS_VX) |
9977e886 HB |
201 | convert_vx_to_fp((freg_t *)&fpregs->fprs, |
202 | current->thread.fpu.vxrs); | |
203 | else | |
204 | memcpy(&fpregs->fprs, current->thread.fpu.fprs, | |
205 | sizeof(fpregs->fprs)); | |
1da177e4 LT |
206 | return 1; |
207 | } | |
1485c5c8 | 208 | EXPORT_SYMBOL(dump_fpu); |
1da177e4 | 209 | |
1da177e4 LT |
210 | unsigned long get_wchan(struct task_struct *p) |
211 | { | |
212 | struct stack_frame *sf, *low, *high; | |
213 | unsigned long return_address; | |
214 | int count; | |
215 | ||
30af7120 | 216 | if (!p || p == current || p->state == TASK_RUNNING || !task_stack_page(p)) |
1da177e4 | 217 | return 0; |
30af7120 AV |
218 | low = task_stack_page(p); |
219 | high = (struct stack_frame *) task_pt_regs(p); | |
1da177e4 LT |
220 | sf = (struct stack_frame *) (p->thread.ksp & PSW_ADDR_INSN); |
221 | if (sf <= low || sf > high) | |
222 | return 0; | |
223 | for (count = 0; count < 16; count++) { | |
224 | sf = (struct stack_frame *) (sf->back_chain & PSW_ADDR_INSN); | |
225 | if (sf <= low || sf > high) | |
226 | return 0; | |
227 | return_address = sf->gprs[8] & PSW_ADDR_INSN; | |
228 | if (!in_sched_functions(return_address)) | |
229 | return return_address; | |
230 | } | |
231 | return 0; | |
232 | } | |
9887a1fc HC |
233 | |
234 | unsigned long arch_align_stack(unsigned long sp) | |
235 | { | |
236 | if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space) | |
237 | sp -= get_random_int() & ~PAGE_MASK; | |
238 | return sp & ~0xf; | |
239 | } | |
33519182 HC |
240 | |
241 | static inline unsigned long brk_rnd(void) | |
242 | { | |
243 | /* 8MB for 32bit, 1GB for 64bit */ | |
244 | if (is_32bit_task()) | |
245 | return (get_random_int() & 0x7ffUL) << PAGE_SHIFT; | |
246 | else | |
247 | return (get_random_int() & 0x3ffffUL) << PAGE_SHIFT; | |
248 | } | |
249 | ||
250 | unsigned long arch_randomize_brk(struct mm_struct *mm) | |
251 | { | |
9efe4f29 | 252 | unsigned long ret; |
33519182 | 253 | |
9efe4f29 MS |
254 | ret = PAGE_ALIGN(mm->brk + brk_rnd()); |
255 | return (ret > mm->brk) ? ret : mm->brk; | |
33519182 | 256 | } |