Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * arch/s390/kernel/process.c |
| 3 | * |
| 4 | * S390 version |
| 5 | * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation |
| 6 | * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), |
| 7 | * Hartmut Penner (hp@de.ibm.com), |
| 8 | * Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com), |
| 9 | * |
| 10 | * Derived from "arch/i386/kernel/process.c" |
| 11 | * Copyright (C) 1995, Linus Torvalds |
| 12 | */ |
| 13 | |
| 14 | /* |
| 15 | * This file handles the architecture-dependent parts of process handling.. |
| 16 | */ |
| 17 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/compiler.h> |
| 19 | #include <linux/cpu.h> |
| 20 | #include <linux/errno.h> |
| 21 | #include <linux/sched.h> |
| 22 | #include <linux/kernel.h> |
| 23 | #include <linux/mm.h> |
Alexey Dobriyan | 4e950f6 | 2007-07-30 02:36:13 +0400 | [diff] [blame] | 24 | #include <linux/fs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/smp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <linux/stddef.h> |
| 27 | #include <linux/unistd.h> |
| 28 | #include <linux/ptrace.h> |
| 29 | #include <linux/slab.h> |
| 30 | #include <linux/vmalloc.h> |
| 31 | #include <linux/user.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include <linux/interrupt.h> |
| 33 | #include <linux/delay.h> |
| 34 | #include <linux/reboot.h> |
| 35 | #include <linux/init.h> |
| 36 | #include <linux/module.h> |
| 37 | #include <linux/notifier.h> |
Heiko Carstens | 5c69971 | 2008-01-26 14:11:01 +0100 | [diff] [blame] | 38 | #include <linux/utsname.h> |
Heiko Carstens | 5a62b19 | 2008-04-17 07:46:25 +0200 | [diff] [blame^] | 39 | #include <linux/tick.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | #include <asm/uaccess.h> |
| 41 | #include <asm/pgtable.h> |
| 42 | #include <asm/system.h> |
| 43 | #include <asm/io.h> |
| 44 | #include <asm/processor.h> |
| 45 | #include <asm/irq.h> |
| 46 | #include <asm/timer.h> |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 47 | #include <asm/cpu.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 49 | asmlinkage void ret_from_fork(void) asm ("ret_from_fork"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | |
| 51 | /* |
| 52 | * Return saved PC of a blocked thread. used in kernel/sched. |
| 53 | * resume in entry.S does not create a new stack frame, it |
| 54 | * just stores the registers %r6-%r15 to the frame given by |
| 55 | * schedule. We want to return the address of the caller of |
| 56 | * schedule, so we have to walk the backchain one time to |
| 57 | * find the frame schedule() store its return address. |
| 58 | */ |
| 59 | unsigned long thread_saved_pc(struct task_struct *tsk) |
| 60 | { |
Heiko Carstens | eb33c19 | 2006-01-14 13:20:57 -0800 | [diff] [blame] | 61 | struct stack_frame *sf, *low, *high; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | |
Heiko Carstens | eb33c19 | 2006-01-14 13:20:57 -0800 | [diff] [blame] | 63 | if (!tsk || !task_stack_page(tsk)) |
| 64 | return 0; |
| 65 | low = task_stack_page(tsk); |
| 66 | high = (struct stack_frame *) task_pt_regs(tsk); |
| 67 | sf = (struct stack_frame *) (tsk->thread.ksp & PSW_ADDR_INSN); |
| 68 | if (sf <= low || sf > high) |
| 69 | return 0; |
| 70 | sf = (struct stack_frame *) (sf->back_chain & PSW_ADDR_INSN); |
| 71 | if (sf <= low || sf > high) |
| 72 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | return sf->gprs[8]; |
| 74 | } |
| 75 | |
| 76 | /* |
| 77 | * Need to know about CPUs going idle? |
| 78 | */ |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 79 | static ATOMIC_NOTIFIER_HEAD(idle_chain); |
Heiko Carstens | 43ca5c3 | 2008-04-17 07:46:23 +0200 | [diff] [blame] | 80 | DEFINE_PER_CPU(struct s390_idle_data, s390_idle); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | |
| 82 | int register_idle_notifier(struct notifier_block *nb) |
| 83 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 84 | return atomic_notifier_chain_register(&idle_chain, nb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | } |
| 86 | EXPORT_SYMBOL(register_idle_notifier); |
| 87 | |
| 88 | int unregister_idle_notifier(struct notifier_block *nb) |
| 89 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 90 | return atomic_notifier_chain_unregister(&idle_chain, nb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | } |
| 92 | EXPORT_SYMBOL(unregister_idle_notifier); |
| 93 | |
Heiko Carstens | 43ca5c3 | 2008-04-17 07:46:23 +0200 | [diff] [blame] | 94 | static int s390_idle_enter(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | { |
Heiko Carstens | 43ca5c3 | 2008-04-17 07:46:23 +0200 | [diff] [blame] | 96 | struct s390_idle_data *idle; |
| 97 | int nr_calls = 0; |
| 98 | void *hcpu; |
| 99 | int rc; |
| 100 | |
| 101 | hcpu = (void *)(long)smp_processor_id(); |
| 102 | rc = __atomic_notifier_call_chain(&idle_chain, S390_CPU_IDLE, hcpu, -1, |
| 103 | &nr_calls); |
| 104 | if (rc == NOTIFY_BAD) { |
| 105 | nr_calls--; |
| 106 | __atomic_notifier_call_chain(&idle_chain, S390_CPU_NOT_IDLE, |
| 107 | hcpu, nr_calls, NULL); |
| 108 | return rc; |
| 109 | } |
| 110 | idle = &__get_cpu_var(s390_idle); |
| 111 | spin_lock(&idle->lock); |
| 112 | idle->idle_count++; |
| 113 | idle->in_idle = 1; |
| 114 | idle->idle_enter = get_clock(); |
| 115 | spin_unlock(&idle->lock); |
| 116 | return NOTIFY_OK; |
| 117 | } |
| 118 | |
| 119 | void s390_idle_leave(void) |
| 120 | { |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 121 | struct s390_idle_data *idle; |
| 122 | |
| 123 | idle = &__get_cpu_var(s390_idle); |
| 124 | spin_lock(&idle->lock); |
| 125 | idle->idle_time += get_clock() - idle->idle_enter; |
| 126 | idle->in_idle = 0; |
| 127 | spin_unlock(&idle->lock); |
Heiko Carstens | dce5547 | 2007-07-10 11:24:21 +0200 | [diff] [blame] | 128 | atomic_notifier_call_chain(&idle_chain, S390_CPU_NOT_IDLE, |
| 129 | (void *)(long) smp_processor_id()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | } |
| 131 | |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 132 | extern void s390_handle_mcck(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | /* |
| 134 | * The idle loop on a S390... |
| 135 | */ |
Adrian Bunk | cdb0452 | 2006-03-24 03:15:57 -0800 | [diff] [blame] | 136 | static void default_idle(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | /* CPU is going idle. */ |
Nick Piggin | 64c7c8f | 2005-11-08 21:39:04 -0800 | [diff] [blame] | 139 | local_irq_disable(); |
| 140 | if (need_resched()) { |
| 141 | local_irq_enable(); |
| 142 | return; |
| 143 | } |
Heiko Carstens | 43ca5c3 | 2008-04-17 07:46:23 +0200 | [diff] [blame] | 144 | if (s390_idle_enter() == NOTIFY_BAD) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | local_irq_enable(); |
| 146 | return; |
| 147 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | #ifdef CONFIG_HOTPLUG_CPU |
Heiko Carstens | 43ca5c3 | 2008-04-17 07:46:23 +0200 | [diff] [blame] | 149 | if (cpu_is_offline(smp_processor_id())) { |
Heiko Carstens | 1fca251 | 2006-02-17 13:52:46 -0800 | [diff] [blame] | 150 | preempt_enable_no_resched(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | cpu_die(); |
Heiko Carstens | 1fca251 | 2006-02-17 13:52:46 -0800 | [diff] [blame] | 152 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | #endif |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 154 | local_mcck_disable(); |
| 155 | if (test_thread_flag(TIF_MCCK_PENDING)) { |
| 156 | local_mcck_enable(); |
Heiko Carstens | 43ca5c3 | 2008-04-17 07:46:23 +0200 | [diff] [blame] | 157 | s390_idle_leave(); |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 158 | local_irq_enable(); |
| 159 | s390_handle_mcck(); |
| 160 | return; |
| 161 | } |
Heiko Carstens | 1f194a4 | 2006-07-03 00:24:46 -0700 | [diff] [blame] | 162 | trace_hardirqs_on(); |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 163 | /* Wait for external, I/O or machine check interrupt. */ |
Gerald Schaefer | c1821c2 | 2007-02-05 21:18:17 +0100 | [diff] [blame] | 164 | __load_psw_mask(psw_kernel_bits | PSW_MASK_WAIT | |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 165 | PSW_MASK_IO | PSW_MASK_EXT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | } |
| 167 | |
| 168 | void cpu_idle(void) |
| 169 | { |
Nick Piggin | 5bfb5d6 | 2005-11-08 21:39:01 -0800 | [diff] [blame] | 170 | for (;;) { |
Heiko Carstens | 5a62b19 | 2008-04-17 07:46:25 +0200 | [diff] [blame^] | 171 | tick_nohz_stop_sched_tick(); |
Nick Piggin | 5bfb5d6 | 2005-11-08 21:39:01 -0800 | [diff] [blame] | 172 | while (!need_resched()) |
| 173 | default_idle(); |
Heiko Carstens | 5a62b19 | 2008-04-17 07:46:25 +0200 | [diff] [blame^] | 174 | tick_nohz_restart_sched_tick(); |
Nick Piggin | 5bfb5d6 | 2005-11-08 21:39:01 -0800 | [diff] [blame] | 175 | preempt_enable_no_resched(); |
| 176 | schedule(); |
| 177 | preempt_disable(); |
| 178 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | } |
| 180 | |
| 181 | void show_regs(struct pt_regs *regs) |
| 182 | { |
Heiko Carstens | 5c69971 | 2008-01-26 14:11:01 +0100 | [diff] [blame] | 183 | print_modules(); |
| 184 | printk("CPU: %d %s %s %.*s\n", |
| 185 | task_thread_info(current)->cpu, print_tainted(), |
| 186 | init_utsname()->release, |
| 187 | (int)strcspn(init_utsname()->version, " "), |
| 188 | init_utsname()->version); |
| 189 | printk("Process %s (pid: %d, task: %p, ksp: %p)\n", |
| 190 | current->comm, current->pid, current, |
| 191 | (void *) current->thread.ksp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | show_registers(regs); |
| 193 | /* Show stack backtrace if pt_regs is from kernel mode */ |
| 194 | if (!(regs->psw.mask & PSW_MASK_PSTATE)) |
Heiko Carstens | d2c993d | 2006-07-12 16:41:55 +0200 | [diff] [blame] | 195 | show_trace(NULL, (unsigned long *) regs->gprs[15]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | } |
| 197 | |
| 198 | extern void kernel_thread_starter(void); |
| 199 | |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 200 | asm( |
| 201 | ".align 4\n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | "kernel_thread_starter:\n" |
| 203 | " la 2,0(10)\n" |
| 204 | " basr 14,9\n" |
| 205 | " la 2,0\n" |
| 206 | " br 11\n"); |
| 207 | |
| 208 | int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) |
| 209 | { |
| 210 | struct pt_regs regs; |
| 211 | |
| 212 | memset(®s, 0, sizeof(regs)); |
Gerald Schaefer | c1821c2 | 2007-02-05 21:18:17 +0100 | [diff] [blame] | 213 | regs.psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | regs.psw.addr = (unsigned long) kernel_thread_starter | PSW_ADDR_AMODE; |
| 215 | regs.gprs[9] = (unsigned long) fn; |
| 216 | regs.gprs[10] = (unsigned long) arg; |
| 217 | regs.gprs[11] = (unsigned long) do_exit; |
| 218 | regs.orig_gpr2 = -1; |
| 219 | |
| 220 | /* Ok, create the new process.. */ |
| 221 | return do_fork(flags | CLONE_VM | CLONE_UNTRACED, |
| 222 | 0, ®s, 0, NULL, NULL); |
| 223 | } |
| 224 | |
| 225 | /* |
| 226 | * Free current thread data structures etc.. |
| 227 | */ |
| 228 | void exit_thread(void) |
| 229 | { |
| 230 | } |
| 231 | |
| 232 | void flush_thread(void) |
| 233 | { |
| 234 | clear_used_math(); |
| 235 | clear_tsk_thread_flag(current, TIF_USEDFPU); |
| 236 | } |
| 237 | |
| 238 | void release_thread(struct task_struct *dead_task) |
| 239 | { |
| 240 | } |
| 241 | |
| 242 | int copy_thread(int nr, unsigned long clone_flags, unsigned long new_stackp, |
| 243 | unsigned long unused, |
| 244 | struct task_struct * p, struct pt_regs * regs) |
| 245 | { |
| 246 | struct fake_frame |
| 247 | { |
| 248 | struct stack_frame sf; |
| 249 | struct pt_regs childregs; |
| 250 | } *frame; |
| 251 | |
Al Viro | c7584fb | 2006-01-12 01:05:49 -0800 | [diff] [blame] | 252 | frame = container_of(task_pt_regs(p), struct fake_frame, childregs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | p->thread.ksp = (unsigned long) frame; |
| 254 | /* Store access registers to kernel stack of new process. */ |
| 255 | frame->childregs = *regs; |
| 256 | frame->childregs.gprs[2] = 0; /* child returns 0 on fork. */ |
| 257 | frame->childregs.gprs[15] = new_stackp; |
| 258 | frame->sf.back_chain = 0; |
| 259 | |
| 260 | /* new return point is ret_from_fork */ |
| 261 | frame->sf.gprs[8] = (unsigned long) ret_from_fork; |
| 262 | |
| 263 | /* fake return stack for resume(), don't go back to schedule */ |
| 264 | frame->sf.gprs[9] = (unsigned long) frame; |
| 265 | |
| 266 | /* Save access registers to new thread structure. */ |
| 267 | save_access_regs(&p->thread.acrs[0]); |
| 268 | |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 269 | #ifndef CONFIG_64BIT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | /* |
| 271 | * save fprs to current->thread.fp_regs to merge them with |
| 272 | * the emulated registers and then copy the result to the child. |
| 273 | */ |
| 274 | save_fp_regs(¤t->thread.fp_regs); |
| 275 | memcpy(&p->thread.fp_regs, ¤t->thread.fp_regs, |
| 276 | sizeof(s390_fp_regs)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | /* Set a new TLS ? */ |
| 278 | if (clone_flags & CLONE_SETTLS) |
| 279 | p->thread.acrs[0] = regs->gprs[6]; |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 280 | #else /* CONFIG_64BIT */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | /* Save the fpu registers to new thread structure. */ |
| 282 | save_fp_regs(&p->thread.fp_regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | /* Set a new TLS ? */ |
| 284 | if (clone_flags & CLONE_SETTLS) { |
| 285 | if (test_thread_flag(TIF_31BIT)) { |
| 286 | p->thread.acrs[0] = (unsigned int) regs->gprs[6]; |
| 287 | } else { |
| 288 | p->thread.acrs[0] = (unsigned int)(regs->gprs[6] >> 32); |
| 289 | p->thread.acrs[1] = (unsigned int) regs->gprs[6]; |
| 290 | } |
| 291 | } |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 292 | #endif /* CONFIG_64BIT */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | /* start new process with ar4 pointing to the correct address space */ |
| 294 | p->thread.mm_segment = get_fs(); |
| 295 | /* Don't copy debug registers */ |
| 296 | memset(&p->thread.per_info,0,sizeof(p->thread.per_info)); |
| 297 | |
| 298 | return 0; |
| 299 | } |
| 300 | |
Martin Schwidefsky | 03ff9a2 | 2007-04-27 16:01:40 +0200 | [diff] [blame] | 301 | asmlinkage long sys_fork(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | { |
Martin Schwidefsky | 03ff9a2 | 2007-04-27 16:01:40 +0200 | [diff] [blame] | 303 | struct pt_regs *regs = task_pt_regs(current); |
| 304 | return do_fork(SIGCHLD, regs->gprs[15], regs, 0, NULL, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | } |
| 306 | |
Martin Schwidefsky | 03ff9a2 | 2007-04-27 16:01:40 +0200 | [diff] [blame] | 307 | asmlinkage long sys_clone(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | { |
Martin Schwidefsky | 03ff9a2 | 2007-04-27 16:01:40 +0200 | [diff] [blame] | 309 | struct pt_regs *regs = task_pt_regs(current); |
| 310 | unsigned long clone_flags; |
| 311 | unsigned long newsp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | int __user *parent_tidptr, *child_tidptr; |
| 313 | |
Martin Schwidefsky | 03ff9a2 | 2007-04-27 16:01:40 +0200 | [diff] [blame] | 314 | clone_flags = regs->gprs[3]; |
| 315 | newsp = regs->orig_gpr2; |
| 316 | parent_tidptr = (int __user *) regs->gprs[4]; |
| 317 | child_tidptr = (int __user *) regs->gprs[5]; |
| 318 | if (!newsp) |
| 319 | newsp = regs->gprs[15]; |
| 320 | return do_fork(clone_flags, newsp, regs, 0, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | parent_tidptr, child_tidptr); |
| 322 | } |
| 323 | |
| 324 | /* |
| 325 | * This is trivial, and on the face of it looks like it |
| 326 | * could equally well be done in user mode. |
| 327 | * |
| 328 | * Not so, for quite unobvious reasons - register pressure. |
| 329 | * In user mode vfork() cannot have a stack frame, and if |
| 330 | * done by calling the "clone()" system call directly, you |
| 331 | * do not have enough call-clobbered registers to hold all |
| 332 | * the information you need. |
| 333 | */ |
Martin Schwidefsky | 03ff9a2 | 2007-04-27 16:01:40 +0200 | [diff] [blame] | 334 | asmlinkage long sys_vfork(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | { |
Martin Schwidefsky | 03ff9a2 | 2007-04-27 16:01:40 +0200 | [diff] [blame] | 336 | struct pt_regs *regs = task_pt_regs(current); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, |
Martin Schwidefsky | 03ff9a2 | 2007-04-27 16:01:40 +0200 | [diff] [blame] | 338 | regs->gprs[15], regs, 0, NULL, NULL); |
| 339 | } |
| 340 | |
| 341 | asmlinkage void execve_tail(void) |
| 342 | { |
| 343 | task_lock(current); |
| 344 | current->ptrace &= ~PT_DTRACE; |
| 345 | task_unlock(current); |
| 346 | current->thread.fp_regs.fpc = 0; |
| 347 | if (MACHINE_HAS_IEEE) |
| 348 | asm volatile("sfpc %0,%0" : : "d" (0)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | } |
| 350 | |
| 351 | /* |
| 352 | * sys_execve() executes a new program. |
| 353 | */ |
Martin Schwidefsky | 03ff9a2 | 2007-04-27 16:01:40 +0200 | [diff] [blame] | 354 | asmlinkage long sys_execve(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | { |
Martin Schwidefsky | 03ff9a2 | 2007-04-27 16:01:40 +0200 | [diff] [blame] | 356 | struct pt_regs *regs = task_pt_regs(current); |
| 357 | char *filename; |
| 358 | unsigned long result; |
| 359 | int rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | |
Martin Schwidefsky | 03ff9a2 | 2007-04-27 16:01:40 +0200 | [diff] [blame] | 361 | filename = getname((char __user *) regs->orig_gpr2); |
| 362 | if (IS_ERR(filename)) { |
| 363 | result = PTR_ERR(filename); |
| 364 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | } |
Martin Schwidefsky | 03ff9a2 | 2007-04-27 16:01:40 +0200 | [diff] [blame] | 366 | rc = do_execve(filename, (char __user * __user *) regs->gprs[3], |
| 367 | (char __user * __user *) regs->gprs[4], regs); |
| 368 | if (rc) { |
| 369 | result = rc; |
| 370 | goto out_putname; |
| 371 | } |
| 372 | execve_tail(); |
| 373 | result = regs->gprs[2]; |
| 374 | out_putname: |
| 375 | putname(filename); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | out: |
Martin Schwidefsky | 03ff9a2 | 2007-04-27 16:01:40 +0200 | [diff] [blame] | 377 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | } |
| 379 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | /* |
| 381 | * fill in the FPU structure for a core dump. |
| 382 | */ |
| 383 | int dump_fpu (struct pt_regs * regs, s390_fp_regs *fpregs) |
| 384 | { |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 385 | #ifndef CONFIG_64BIT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | /* |
| 387 | * save fprs to current->thread.fp_regs to merge them with |
| 388 | * the emulated registers and then copy the result to the dump. |
| 389 | */ |
| 390 | save_fp_regs(¤t->thread.fp_regs); |
| 391 | memcpy(fpregs, ¤t->thread.fp_regs, sizeof(s390_fp_regs)); |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 392 | #else /* CONFIG_64BIT */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | save_fp_regs(fpregs); |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 394 | #endif /* CONFIG_64BIT */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | return 1; |
| 396 | } |
| 397 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | unsigned long get_wchan(struct task_struct *p) |
| 399 | { |
| 400 | struct stack_frame *sf, *low, *high; |
| 401 | unsigned long return_address; |
| 402 | int count; |
| 403 | |
Al Viro | 30af712 | 2006-01-12 01:05:50 -0800 | [diff] [blame] | 404 | if (!p || p == current || p->state == TASK_RUNNING || !task_stack_page(p)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | return 0; |
Al Viro | 30af712 | 2006-01-12 01:05:50 -0800 | [diff] [blame] | 406 | low = task_stack_page(p); |
| 407 | high = (struct stack_frame *) task_pt_regs(p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | sf = (struct stack_frame *) (p->thread.ksp & PSW_ADDR_INSN); |
| 409 | if (sf <= low || sf > high) |
| 410 | return 0; |
| 411 | for (count = 0; count < 16; count++) { |
| 412 | sf = (struct stack_frame *) (sf->back_chain & PSW_ADDR_INSN); |
| 413 | if (sf <= low || sf > high) |
| 414 | return 0; |
| 415 | return_address = sf->gprs[8] & PSW_ADDR_INSN; |
| 416 | if (!in_sched_functions(return_address)) |
| 417 | return return_address; |
| 418 | } |
| 419 | return 0; |
| 420 | } |
| 421 | |