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> |
Heiko Carstens | a806170 | 2008-04-17 07:46:26 +0200 | [diff] [blame] | 40 | #include <linux/elfcore.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | #include <asm/uaccess.h> |
| 42 | #include <asm/pgtable.h> |
| 43 | #include <asm/system.h> |
| 44 | #include <asm/io.h> |
| 45 | #include <asm/processor.h> |
| 46 | #include <asm/irq.h> |
| 47 | #include <asm/timer.h> |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 48 | #include <asm/cpu.h> |
Heiko Carstens | a806170 | 2008-04-17 07:46:26 +0200 | [diff] [blame] | 49 | #include "entry.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 51 | asmlinkage void ret_from_fork(void) asm ("ret_from_fork"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | |
| 53 | /* |
| 54 | * Return saved PC of a blocked thread. used in kernel/sched. |
| 55 | * resume in entry.S does not create a new stack frame, it |
| 56 | * just stores the registers %r6-%r15 to the frame given by |
| 57 | * schedule. We want to return the address of the caller of |
| 58 | * schedule, so we have to walk the backchain one time to |
| 59 | * find the frame schedule() store its return address. |
| 60 | */ |
| 61 | unsigned long thread_saved_pc(struct task_struct *tsk) |
| 62 | { |
Heiko Carstens | eb33c19 | 2006-01-14 13:20:57 -0800 | [diff] [blame] | 63 | struct stack_frame *sf, *low, *high; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | |
Heiko Carstens | eb33c19 | 2006-01-14 13:20:57 -0800 | [diff] [blame] | 65 | if (!tsk || !task_stack_page(tsk)) |
| 66 | return 0; |
| 67 | low = task_stack_page(tsk); |
| 68 | high = (struct stack_frame *) task_pt_regs(tsk); |
| 69 | sf = (struct stack_frame *) (tsk->thread.ksp & PSW_ADDR_INSN); |
| 70 | if (sf <= low || sf > high) |
| 71 | return 0; |
| 72 | sf = (struct stack_frame *) (sf->back_chain & PSW_ADDR_INSN); |
| 73 | if (sf <= low || sf > high) |
| 74 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | return sf->gprs[8]; |
| 76 | } |
| 77 | |
Josef 'Jeff' Sipek | 3e97239 | 2008-08-21 19:46:31 +0200 | [diff] [blame] | 78 | DEFINE_PER_CPU(struct s390_idle_data, s390_idle) = { |
| 79 | .lock = __SPIN_LOCK_UNLOCKED(s390_idle.lock) |
| 80 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | |
Heiko Carstens | 43ca5c3 | 2008-04-17 07:46:23 +0200 | [diff] [blame] | 82 | static int s390_idle_enter(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | { |
Heiko Carstens | 43ca5c3 | 2008-04-17 07:46:23 +0200 | [diff] [blame] | 84 | struct s390_idle_data *idle; |
Heiko Carstens | 43ca5c3 | 2008-04-17 07:46:23 +0200 | [diff] [blame] | 85 | |
Heiko Carstens | 43ca5c3 | 2008-04-17 07:46:23 +0200 | [diff] [blame] | 86 | idle = &__get_cpu_var(s390_idle); |
| 87 | spin_lock(&idle->lock); |
| 88 | idle->idle_count++; |
| 89 | idle->in_idle = 1; |
| 90 | idle->idle_enter = get_clock(); |
| 91 | spin_unlock(&idle->lock); |
Heiko Carstens | 773922e | 2008-07-14 09:59:06 +0200 | [diff] [blame] | 92 | vtime_stop_cpu_timer(); |
Heiko Carstens | 43ca5c3 | 2008-04-17 07:46:23 +0200 | [diff] [blame] | 93 | return NOTIFY_OK; |
| 94 | } |
| 95 | |
| 96 | void s390_idle_leave(void) |
| 97 | { |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 98 | struct s390_idle_data *idle; |
| 99 | |
Heiko Carstens | 773922e | 2008-07-14 09:59:06 +0200 | [diff] [blame] | 100 | vtime_start_cpu_timer(); |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 101 | idle = &__get_cpu_var(s390_idle); |
| 102 | spin_lock(&idle->lock); |
| 103 | idle->idle_time += get_clock() - idle->idle_enter; |
| 104 | idle->in_idle = 0; |
| 105 | spin_unlock(&idle->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | } |
| 107 | |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 108 | extern void s390_handle_mcck(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | /* |
| 110 | * The idle loop on a S390... |
| 111 | */ |
Adrian Bunk | cdb0452 | 2006-03-24 03:15:57 -0800 | [diff] [blame] | 112 | static void default_idle(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | /* CPU is going idle. */ |
Nick Piggin | 64c7c8f | 2005-11-08 21:39:04 -0800 | [diff] [blame] | 115 | local_irq_disable(); |
| 116 | if (need_resched()) { |
| 117 | local_irq_enable(); |
| 118 | return; |
| 119 | } |
Heiko Carstens | 43ca5c3 | 2008-04-17 07:46:23 +0200 | [diff] [blame] | 120 | if (s390_idle_enter() == NOTIFY_BAD) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | local_irq_enable(); |
| 122 | return; |
| 123 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | #ifdef CONFIG_HOTPLUG_CPU |
Heiko Carstens | 43ca5c3 | 2008-04-17 07:46:23 +0200 | [diff] [blame] | 125 | if (cpu_is_offline(smp_processor_id())) { |
Heiko Carstens | 1fca251 | 2006-02-17 13:52:46 -0800 | [diff] [blame] | 126 | preempt_enable_no_resched(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | cpu_die(); |
Heiko Carstens | 1fca251 | 2006-02-17 13:52:46 -0800 | [diff] [blame] | 128 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | #endif |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 130 | local_mcck_disable(); |
| 131 | if (test_thread_flag(TIF_MCCK_PENDING)) { |
| 132 | local_mcck_enable(); |
Heiko Carstens | 43ca5c3 | 2008-04-17 07:46:23 +0200 | [diff] [blame] | 133 | s390_idle_leave(); |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 134 | local_irq_enable(); |
| 135 | s390_handle_mcck(); |
| 136 | return; |
| 137 | } |
Heiko Carstens | 1f194a4 | 2006-07-03 00:24:46 -0700 | [diff] [blame] | 138 | trace_hardirqs_on(); |
Heiko Carstens | 632448f | 2008-11-14 18:18:04 +0100 | [diff] [blame] | 139 | /* Don't trace preempt off for idle. */ |
| 140 | stop_critical_timings(); |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 141 | /* Wait for external, I/O or machine check interrupt. */ |
Gerald Schaefer | c1821c2 | 2007-02-05 21:18:17 +0100 | [diff] [blame] | 142 | __load_psw_mask(psw_kernel_bits | PSW_MASK_WAIT | |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 143 | PSW_MASK_IO | PSW_MASK_EXT); |
Heiko Carstens | 632448f | 2008-11-14 18:18:04 +0100 | [diff] [blame] | 144 | start_critical_timings(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | } |
| 146 | |
| 147 | void cpu_idle(void) |
| 148 | { |
Nick Piggin | 5bfb5d6 | 2005-11-08 21:39:01 -0800 | [diff] [blame] | 149 | for (;;) { |
Thomas Gleixner | e338125 | 2008-07-19 09:33:21 +0200 | [diff] [blame] | 150 | tick_nohz_stop_sched_tick(1); |
Nick Piggin | 5bfb5d6 | 2005-11-08 21:39:01 -0800 | [diff] [blame] | 151 | while (!need_resched()) |
| 152 | default_idle(); |
Heiko Carstens | 5a62b19 | 2008-04-17 07:46:25 +0200 | [diff] [blame] | 153 | tick_nohz_restart_sched_tick(); |
Nick Piggin | 5bfb5d6 | 2005-11-08 21:39:01 -0800 | [diff] [blame] | 154 | preempt_enable_no_resched(); |
| 155 | schedule(); |
| 156 | preempt_disable(); |
| 157 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | } |
| 159 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | extern void kernel_thread_starter(void); |
| 161 | |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 162 | asm( |
| 163 | ".align 4\n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | "kernel_thread_starter:\n" |
| 165 | " la 2,0(10)\n" |
| 166 | " basr 14,9\n" |
| 167 | " la 2,0\n" |
| 168 | " br 11\n"); |
| 169 | |
| 170 | int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) |
| 171 | { |
| 172 | struct pt_regs regs; |
| 173 | |
| 174 | memset(®s, 0, sizeof(regs)); |
Gerald Schaefer | c1821c2 | 2007-02-05 21:18:17 +0100 | [diff] [blame] | 175 | regs.psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | regs.psw.addr = (unsigned long) kernel_thread_starter | PSW_ADDR_AMODE; |
| 177 | regs.gprs[9] = (unsigned long) fn; |
| 178 | regs.gprs[10] = (unsigned long) arg; |
| 179 | regs.gprs[11] = (unsigned long) do_exit; |
| 180 | regs.orig_gpr2 = -1; |
| 181 | |
| 182 | /* Ok, create the new process.. */ |
| 183 | return do_fork(flags | CLONE_VM | CLONE_UNTRACED, |
| 184 | 0, ®s, 0, NULL, NULL); |
| 185 | } |
| 186 | |
| 187 | /* |
| 188 | * Free current thread data structures etc.. |
| 189 | */ |
| 190 | void exit_thread(void) |
| 191 | { |
| 192 | } |
| 193 | |
| 194 | void flush_thread(void) |
| 195 | { |
| 196 | clear_used_math(); |
| 197 | clear_tsk_thread_flag(current, TIF_USEDFPU); |
| 198 | } |
| 199 | |
| 200 | void release_thread(struct task_struct *dead_task) |
| 201 | { |
| 202 | } |
| 203 | |
| 204 | int copy_thread(int nr, unsigned long clone_flags, unsigned long new_stackp, |
| 205 | unsigned long unused, |
| 206 | struct task_struct * p, struct pt_regs * regs) |
| 207 | { |
| 208 | struct fake_frame |
| 209 | { |
| 210 | struct stack_frame sf; |
| 211 | struct pt_regs childregs; |
| 212 | } *frame; |
| 213 | |
Al Viro | c7584fb | 2006-01-12 01:05:49 -0800 | [diff] [blame] | 214 | frame = container_of(task_pt_regs(p), struct fake_frame, childregs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | p->thread.ksp = (unsigned long) frame; |
| 216 | /* Store access registers to kernel stack of new process. */ |
| 217 | frame->childregs = *regs; |
| 218 | frame->childregs.gprs[2] = 0; /* child returns 0 on fork. */ |
| 219 | frame->childregs.gprs[15] = new_stackp; |
| 220 | frame->sf.back_chain = 0; |
| 221 | |
| 222 | /* new return point is ret_from_fork */ |
| 223 | frame->sf.gprs[8] = (unsigned long) ret_from_fork; |
| 224 | |
| 225 | /* fake return stack for resume(), don't go back to schedule */ |
| 226 | frame->sf.gprs[9] = (unsigned long) frame; |
| 227 | |
| 228 | /* Save access registers to new thread structure. */ |
| 229 | save_access_regs(&p->thread.acrs[0]); |
| 230 | |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 231 | #ifndef CONFIG_64BIT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | /* |
| 233 | * save fprs to current->thread.fp_regs to merge them with |
| 234 | * the emulated registers and then copy the result to the child. |
| 235 | */ |
| 236 | save_fp_regs(¤t->thread.fp_regs); |
| 237 | memcpy(&p->thread.fp_regs, ¤t->thread.fp_regs, |
| 238 | sizeof(s390_fp_regs)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | /* Set a new TLS ? */ |
| 240 | if (clone_flags & CLONE_SETTLS) |
| 241 | p->thread.acrs[0] = regs->gprs[6]; |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 242 | #else /* CONFIG_64BIT */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | /* Save the fpu registers to new thread structure. */ |
| 244 | save_fp_regs(&p->thread.fp_regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | /* Set a new TLS ? */ |
| 246 | if (clone_flags & CLONE_SETTLS) { |
| 247 | if (test_thread_flag(TIF_31BIT)) { |
| 248 | p->thread.acrs[0] = (unsigned int) regs->gprs[6]; |
| 249 | } else { |
| 250 | p->thread.acrs[0] = (unsigned int)(regs->gprs[6] >> 32); |
| 251 | p->thread.acrs[1] = (unsigned int) regs->gprs[6]; |
| 252 | } |
| 253 | } |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 254 | #endif /* CONFIG_64BIT */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | /* start new process with ar4 pointing to the correct address space */ |
| 256 | p->thread.mm_segment = get_fs(); |
| 257 | /* Don't copy debug registers */ |
| 258 | memset(&p->thread.per_info,0,sizeof(p->thread.per_info)); |
| 259 | |
| 260 | return 0; |
| 261 | } |
| 262 | |
Martin Schwidefsky | 03ff9a2 | 2007-04-27 16:01:40 +0200 | [diff] [blame] | 263 | asmlinkage long sys_fork(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | { |
Martin Schwidefsky | 03ff9a2 | 2007-04-27 16:01:40 +0200 | [diff] [blame] | 265 | struct pt_regs *regs = task_pt_regs(current); |
| 266 | return do_fork(SIGCHLD, regs->gprs[15], regs, 0, NULL, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | } |
| 268 | |
Martin Schwidefsky | 03ff9a2 | 2007-04-27 16:01:40 +0200 | [diff] [blame] | 269 | asmlinkage long sys_clone(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | { |
Martin Schwidefsky | 03ff9a2 | 2007-04-27 16:01:40 +0200 | [diff] [blame] | 271 | struct pt_regs *regs = task_pt_regs(current); |
| 272 | unsigned long clone_flags; |
| 273 | unsigned long newsp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | int __user *parent_tidptr, *child_tidptr; |
| 275 | |
Martin Schwidefsky | 03ff9a2 | 2007-04-27 16:01:40 +0200 | [diff] [blame] | 276 | clone_flags = regs->gprs[3]; |
| 277 | newsp = regs->orig_gpr2; |
| 278 | parent_tidptr = (int __user *) regs->gprs[4]; |
| 279 | child_tidptr = (int __user *) regs->gprs[5]; |
| 280 | if (!newsp) |
| 281 | newsp = regs->gprs[15]; |
| 282 | return do_fork(clone_flags, newsp, regs, 0, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | parent_tidptr, child_tidptr); |
| 284 | } |
| 285 | |
| 286 | /* |
| 287 | * This is trivial, and on the face of it looks like it |
| 288 | * could equally well be done in user mode. |
| 289 | * |
| 290 | * Not so, for quite unobvious reasons - register pressure. |
| 291 | * In user mode vfork() cannot have a stack frame, and if |
| 292 | * done by calling the "clone()" system call directly, you |
| 293 | * do not have enough call-clobbered registers to hold all |
| 294 | * the information you need. |
| 295 | */ |
Martin Schwidefsky | 03ff9a2 | 2007-04-27 16:01:40 +0200 | [diff] [blame] | 296 | asmlinkage long sys_vfork(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | { |
Martin Schwidefsky | 03ff9a2 | 2007-04-27 16:01:40 +0200 | [diff] [blame] | 298 | struct pt_regs *regs = task_pt_regs(current); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, |
Martin Schwidefsky | 03ff9a2 | 2007-04-27 16:01:40 +0200 | [diff] [blame] | 300 | regs->gprs[15], regs, 0, NULL, NULL); |
| 301 | } |
| 302 | |
| 303 | asmlinkage void execve_tail(void) |
| 304 | { |
| 305 | task_lock(current); |
| 306 | current->ptrace &= ~PT_DTRACE; |
| 307 | task_unlock(current); |
| 308 | current->thread.fp_regs.fpc = 0; |
| 309 | if (MACHINE_HAS_IEEE) |
| 310 | asm volatile("sfpc %0,%0" : : "d" (0)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | } |
| 312 | |
| 313 | /* |
| 314 | * sys_execve() executes a new program. |
| 315 | */ |
Martin Schwidefsky | 03ff9a2 | 2007-04-27 16:01:40 +0200 | [diff] [blame] | 316 | asmlinkage long sys_execve(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | { |
Martin Schwidefsky | 03ff9a2 | 2007-04-27 16:01:40 +0200 | [diff] [blame] | 318 | struct pt_regs *regs = task_pt_regs(current); |
| 319 | char *filename; |
| 320 | unsigned long result; |
| 321 | int rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | |
Martin Schwidefsky | 03ff9a2 | 2007-04-27 16:01:40 +0200 | [diff] [blame] | 323 | filename = getname((char __user *) regs->orig_gpr2); |
| 324 | if (IS_ERR(filename)) { |
| 325 | result = PTR_ERR(filename); |
| 326 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | } |
Martin Schwidefsky | 03ff9a2 | 2007-04-27 16:01:40 +0200 | [diff] [blame] | 328 | rc = do_execve(filename, (char __user * __user *) regs->gprs[3], |
| 329 | (char __user * __user *) regs->gprs[4], regs); |
| 330 | if (rc) { |
| 331 | result = rc; |
| 332 | goto out_putname; |
| 333 | } |
| 334 | execve_tail(); |
| 335 | result = regs->gprs[2]; |
| 336 | out_putname: |
| 337 | putname(filename); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | out: |
Martin Schwidefsky | 03ff9a2 | 2007-04-27 16:01:40 +0200 | [diff] [blame] | 339 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | } |
| 341 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | /* |
| 343 | * fill in the FPU structure for a core dump. |
| 344 | */ |
| 345 | int dump_fpu (struct pt_regs * regs, s390_fp_regs *fpregs) |
| 346 | { |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 347 | #ifndef CONFIG_64BIT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | /* |
| 349 | * save fprs to current->thread.fp_regs to merge them with |
| 350 | * the emulated registers and then copy the result to the dump. |
| 351 | */ |
| 352 | save_fp_regs(¤t->thread.fp_regs); |
| 353 | memcpy(fpregs, ¤t->thread.fp_regs, sizeof(s390_fp_regs)); |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 354 | #else /* CONFIG_64BIT */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | save_fp_regs(fpregs); |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 356 | #endif /* CONFIG_64BIT */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | return 1; |
| 358 | } |
| 359 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | unsigned long get_wchan(struct task_struct *p) |
| 361 | { |
| 362 | struct stack_frame *sf, *low, *high; |
| 363 | unsigned long return_address; |
| 364 | int count; |
| 365 | |
Al Viro | 30af7120 | 2006-01-12 01:05:50 -0800 | [diff] [blame] | 366 | if (!p || p == current || p->state == TASK_RUNNING || !task_stack_page(p)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | return 0; |
Al Viro | 30af7120 | 2006-01-12 01:05:50 -0800 | [diff] [blame] | 368 | low = task_stack_page(p); |
| 369 | high = (struct stack_frame *) task_pt_regs(p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | sf = (struct stack_frame *) (p->thread.ksp & PSW_ADDR_INSN); |
| 371 | if (sf <= low || sf > high) |
| 372 | return 0; |
| 373 | for (count = 0; count < 16; count++) { |
| 374 | sf = (struct stack_frame *) (sf->back_chain & PSW_ADDR_INSN); |
| 375 | if (sf <= low || sf > high) |
| 376 | return 0; |
| 377 | return_address = sf->gprs[8] & PSW_ADDR_INSN; |
| 378 | if (!in_sched_functions(return_address)) |
| 379 | return return_address; |
| 380 | } |
| 381 | return 0; |
| 382 | } |
| 383 | |