Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Paul Mundt | 5a4f7c6 | 2007-11-20 18:08:06 +0900 | [diff] [blame] | 2 | * arch/sh/kernel/process_64.c |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
Paul Mundt | 5a4f7c6 | 2007-11-20 18:08:06 +0900 | [diff] [blame] | 4 | * This file handles the architecture-dependent parts of process handling.. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * |
| 6 | * Copyright (C) 2000, 2001 Paolo Alberelli |
Paul Mundt | 5a4f7c6 | 2007-11-20 18:08:06 +0900 | [diff] [blame] | 7 | * Copyright (C) 2003 - 2007 Paul Mundt |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * Copyright (C) 2003, 2004 Richard Curnow |
| 9 | * |
| 10 | * Started from SH3/4 version: |
| 11 | * Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima |
| 12 | * |
| 13 | * In turn started from i386 version: |
| 14 | * Copyright (C) 1995 Linus Torvalds |
| 15 | * |
Paul Mundt | 5a4f7c6 | 2007-11-20 18:08:06 +0900 | [diff] [blame] | 16 | * This file is subject to the terms and conditions of the GNU General Public |
| 17 | * License. See the file "COPYING" in the main directory of this archive |
| 18 | * for more details. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/mm.h> |
Paul Mundt | 78d9827 | 2007-07-31 13:03:02 +0900 | [diff] [blame] | 21 | #include <linux/fs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/ptrace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <linux/reboot.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 24 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/init.h> |
Arnd Bergmann | 821278a | 2006-10-02 02:18:41 -0700 | [diff] [blame] | 26 | #include <linux/module.h> |
Paul Mundt | a7aa92d | 2007-11-20 15:38:50 +0900 | [diff] [blame] | 27 | #include <linux/io.h> |
Paul Mundt | fa43972 | 2008-09-04 18:53:58 +0900 | [diff] [blame] | 28 | #include <asm/syscalls.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <asm/uaccess.h> |
| 30 | #include <asm/pgtable.h> |
Paul Mundt | df0fb25 | 2007-11-21 17:07:46 +0900 | [diff] [blame] | 31 | #include <asm/mmu_context.h> |
Adrian Bunk | 50387b3 | 2008-04-13 21:15:38 +0300 | [diff] [blame] | 32 | #include <asm/fpu.h> |
David Howells | e839ca5 | 2012-03-28 18:30:03 +0100 | [diff] [blame] | 33 | #include <asm/switch_to.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | |
| 35 | struct task_struct *last_task_used_math = NULL; |
Paul Mundt | 3a9485d | 2012-05-24 15:07:47 +0900 | [diff] [blame] | 36 | struct pt_regs fake_swapper_regs = { 0, }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
Paul Mundt | fbb82b0 | 2010-01-20 16:42:52 +0900 | [diff] [blame] | 38 | void show_regs(struct pt_regs *regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | { |
| 40 | unsigned long long ah, al, bh, bl, ch, cl; |
| 41 | |
| 42 | printk("\n"); |
| 43 | |
| 44 | ah = (regs->pc) >> 32; |
| 45 | al = (regs->pc) & 0xffffffff; |
| 46 | bh = (regs->regs[18]) >> 32; |
| 47 | bl = (regs->regs[18]) & 0xffffffff; |
| 48 | ch = (regs->regs[15]) >> 32; |
| 49 | cl = (regs->regs[15]) & 0xffffffff; |
| 50 | printk("PC : %08Lx%08Lx LINK: %08Lx%08Lx SP : %08Lx%08Lx\n", |
| 51 | ah, al, bh, bl, ch, cl); |
| 52 | |
| 53 | ah = (regs->sr) >> 32; |
| 54 | al = (regs->sr) & 0xffffffff; |
| 55 | asm volatile ("getcon " __TEA ", %0" : "=r" (bh)); |
| 56 | asm volatile ("getcon " __TEA ", %0" : "=r" (bl)); |
| 57 | bh = (bh) >> 32; |
| 58 | bl = (bl) & 0xffffffff; |
| 59 | asm volatile ("getcon " __KCR0 ", %0" : "=r" (ch)); |
| 60 | asm volatile ("getcon " __KCR0 ", %0" : "=r" (cl)); |
| 61 | ch = (ch) >> 32; |
| 62 | cl = (cl) & 0xffffffff; |
| 63 | printk("SR : %08Lx%08Lx TEA : %08Lx%08Lx KCR0: %08Lx%08Lx\n", |
| 64 | ah, al, bh, bl, ch, cl); |
| 65 | |
| 66 | ah = (regs->regs[0]) >> 32; |
| 67 | al = (regs->regs[0]) & 0xffffffff; |
| 68 | bh = (regs->regs[1]) >> 32; |
| 69 | bl = (regs->regs[1]) & 0xffffffff; |
| 70 | ch = (regs->regs[2]) >> 32; |
| 71 | cl = (regs->regs[2]) & 0xffffffff; |
| 72 | printk("R0 : %08Lx%08Lx R1 : %08Lx%08Lx R2 : %08Lx%08Lx\n", |
| 73 | ah, al, bh, bl, ch, cl); |
| 74 | |
| 75 | ah = (regs->regs[3]) >> 32; |
| 76 | al = (regs->regs[3]) & 0xffffffff; |
| 77 | bh = (regs->regs[4]) >> 32; |
| 78 | bl = (regs->regs[4]) & 0xffffffff; |
| 79 | ch = (regs->regs[5]) >> 32; |
| 80 | cl = (regs->regs[5]) & 0xffffffff; |
| 81 | printk("R3 : %08Lx%08Lx R4 : %08Lx%08Lx R5 : %08Lx%08Lx\n", |
| 82 | ah, al, bh, bl, ch, cl); |
| 83 | |
| 84 | ah = (regs->regs[6]) >> 32; |
| 85 | al = (regs->regs[6]) & 0xffffffff; |
| 86 | bh = (regs->regs[7]) >> 32; |
| 87 | bl = (regs->regs[7]) & 0xffffffff; |
| 88 | ch = (regs->regs[8]) >> 32; |
| 89 | cl = (regs->regs[8]) & 0xffffffff; |
| 90 | printk("R6 : %08Lx%08Lx R7 : %08Lx%08Lx R8 : %08Lx%08Lx\n", |
| 91 | ah, al, bh, bl, ch, cl); |
| 92 | |
| 93 | ah = (regs->regs[9]) >> 32; |
| 94 | al = (regs->regs[9]) & 0xffffffff; |
| 95 | bh = (regs->regs[10]) >> 32; |
| 96 | bl = (regs->regs[10]) & 0xffffffff; |
| 97 | ch = (regs->regs[11]) >> 32; |
| 98 | cl = (regs->regs[11]) & 0xffffffff; |
| 99 | printk("R9 : %08Lx%08Lx R10 : %08Lx%08Lx R11 : %08Lx%08Lx\n", |
| 100 | ah, al, bh, bl, ch, cl); |
| 101 | |
| 102 | ah = (regs->regs[12]) >> 32; |
| 103 | al = (regs->regs[12]) & 0xffffffff; |
| 104 | bh = (regs->regs[13]) >> 32; |
| 105 | bl = (regs->regs[13]) & 0xffffffff; |
| 106 | ch = (regs->regs[14]) >> 32; |
| 107 | cl = (regs->regs[14]) & 0xffffffff; |
| 108 | printk("R12 : %08Lx%08Lx R13 : %08Lx%08Lx R14 : %08Lx%08Lx\n", |
| 109 | ah, al, bh, bl, ch, cl); |
| 110 | |
| 111 | ah = (regs->regs[16]) >> 32; |
| 112 | al = (regs->regs[16]) & 0xffffffff; |
| 113 | bh = (regs->regs[17]) >> 32; |
| 114 | bl = (regs->regs[17]) & 0xffffffff; |
| 115 | ch = (regs->regs[19]) >> 32; |
| 116 | cl = (regs->regs[19]) & 0xffffffff; |
| 117 | printk("R16 : %08Lx%08Lx R17 : %08Lx%08Lx R19 : %08Lx%08Lx\n", |
| 118 | ah, al, bh, bl, ch, cl); |
| 119 | |
| 120 | ah = (regs->regs[20]) >> 32; |
| 121 | al = (regs->regs[20]) & 0xffffffff; |
| 122 | bh = (regs->regs[21]) >> 32; |
| 123 | bl = (regs->regs[21]) & 0xffffffff; |
| 124 | ch = (regs->regs[22]) >> 32; |
| 125 | cl = (regs->regs[22]) & 0xffffffff; |
| 126 | printk("R20 : %08Lx%08Lx R21 : %08Lx%08Lx R22 : %08Lx%08Lx\n", |
| 127 | ah, al, bh, bl, ch, cl); |
| 128 | |
| 129 | ah = (regs->regs[23]) >> 32; |
| 130 | al = (regs->regs[23]) & 0xffffffff; |
| 131 | bh = (regs->regs[24]) >> 32; |
| 132 | bl = (regs->regs[24]) & 0xffffffff; |
| 133 | ch = (regs->regs[25]) >> 32; |
| 134 | cl = (regs->regs[25]) & 0xffffffff; |
| 135 | printk("R23 : %08Lx%08Lx R24 : %08Lx%08Lx R25 : %08Lx%08Lx\n", |
| 136 | ah, al, bh, bl, ch, cl); |
| 137 | |
| 138 | ah = (regs->regs[26]) >> 32; |
| 139 | al = (regs->regs[26]) & 0xffffffff; |
| 140 | bh = (regs->regs[27]) >> 32; |
| 141 | bl = (regs->regs[27]) & 0xffffffff; |
| 142 | ch = (regs->regs[28]) >> 32; |
| 143 | cl = (regs->regs[28]) & 0xffffffff; |
| 144 | printk("R26 : %08Lx%08Lx R27 : %08Lx%08Lx R28 : %08Lx%08Lx\n", |
| 145 | ah, al, bh, bl, ch, cl); |
| 146 | |
| 147 | ah = (regs->regs[29]) >> 32; |
| 148 | al = (regs->regs[29]) & 0xffffffff; |
| 149 | bh = (regs->regs[30]) >> 32; |
| 150 | bl = (regs->regs[30]) & 0xffffffff; |
| 151 | ch = (regs->regs[31]) >> 32; |
| 152 | cl = (regs->regs[31]) & 0xffffffff; |
| 153 | printk("R29 : %08Lx%08Lx R30 : %08Lx%08Lx R31 : %08Lx%08Lx\n", |
| 154 | ah, al, bh, bl, ch, cl); |
| 155 | |
| 156 | ah = (regs->regs[32]) >> 32; |
| 157 | al = (regs->regs[32]) & 0xffffffff; |
| 158 | bh = (regs->regs[33]) >> 32; |
| 159 | bl = (regs->regs[33]) & 0xffffffff; |
| 160 | ch = (regs->regs[34]) >> 32; |
| 161 | cl = (regs->regs[34]) & 0xffffffff; |
| 162 | printk("R32 : %08Lx%08Lx R33 : %08Lx%08Lx R34 : %08Lx%08Lx\n", |
| 163 | ah, al, bh, bl, ch, cl); |
| 164 | |
| 165 | ah = (regs->regs[35]) >> 32; |
| 166 | al = (regs->regs[35]) & 0xffffffff; |
| 167 | bh = (regs->regs[36]) >> 32; |
| 168 | bl = (regs->regs[36]) & 0xffffffff; |
| 169 | ch = (regs->regs[37]) >> 32; |
| 170 | cl = (regs->regs[37]) & 0xffffffff; |
| 171 | printk("R35 : %08Lx%08Lx R36 : %08Lx%08Lx R37 : %08Lx%08Lx\n", |
| 172 | ah, al, bh, bl, ch, cl); |
| 173 | |
| 174 | ah = (regs->regs[38]) >> 32; |
| 175 | al = (regs->regs[38]) & 0xffffffff; |
| 176 | bh = (regs->regs[39]) >> 32; |
| 177 | bl = (regs->regs[39]) & 0xffffffff; |
| 178 | ch = (regs->regs[40]) >> 32; |
| 179 | cl = (regs->regs[40]) & 0xffffffff; |
| 180 | printk("R38 : %08Lx%08Lx R39 : %08Lx%08Lx R40 : %08Lx%08Lx\n", |
| 181 | ah, al, bh, bl, ch, cl); |
| 182 | |
| 183 | ah = (regs->regs[41]) >> 32; |
| 184 | al = (regs->regs[41]) & 0xffffffff; |
| 185 | bh = (regs->regs[42]) >> 32; |
| 186 | bl = (regs->regs[42]) & 0xffffffff; |
| 187 | ch = (regs->regs[43]) >> 32; |
| 188 | cl = (regs->regs[43]) & 0xffffffff; |
| 189 | printk("R41 : %08Lx%08Lx R42 : %08Lx%08Lx R43 : %08Lx%08Lx\n", |
| 190 | ah, al, bh, bl, ch, cl); |
| 191 | |
| 192 | ah = (regs->regs[44]) >> 32; |
| 193 | al = (regs->regs[44]) & 0xffffffff; |
| 194 | bh = (regs->regs[45]) >> 32; |
| 195 | bl = (regs->regs[45]) & 0xffffffff; |
| 196 | ch = (regs->regs[46]) >> 32; |
| 197 | cl = (regs->regs[46]) & 0xffffffff; |
| 198 | printk("R44 : %08Lx%08Lx R45 : %08Lx%08Lx R46 : %08Lx%08Lx\n", |
| 199 | ah, al, bh, bl, ch, cl); |
| 200 | |
| 201 | ah = (regs->regs[47]) >> 32; |
| 202 | al = (regs->regs[47]) & 0xffffffff; |
| 203 | bh = (regs->regs[48]) >> 32; |
| 204 | bl = (regs->regs[48]) & 0xffffffff; |
| 205 | ch = (regs->regs[49]) >> 32; |
| 206 | cl = (regs->regs[49]) & 0xffffffff; |
| 207 | printk("R47 : %08Lx%08Lx R48 : %08Lx%08Lx R49 : %08Lx%08Lx\n", |
| 208 | ah, al, bh, bl, ch, cl); |
| 209 | |
| 210 | ah = (regs->regs[50]) >> 32; |
| 211 | al = (regs->regs[50]) & 0xffffffff; |
| 212 | bh = (regs->regs[51]) >> 32; |
| 213 | bl = (regs->regs[51]) & 0xffffffff; |
| 214 | ch = (regs->regs[52]) >> 32; |
| 215 | cl = (regs->regs[52]) & 0xffffffff; |
| 216 | printk("R50 : %08Lx%08Lx R51 : %08Lx%08Lx R52 : %08Lx%08Lx\n", |
| 217 | ah, al, bh, bl, ch, cl); |
| 218 | |
| 219 | ah = (regs->regs[53]) >> 32; |
| 220 | al = (regs->regs[53]) & 0xffffffff; |
| 221 | bh = (regs->regs[54]) >> 32; |
| 222 | bl = (regs->regs[54]) & 0xffffffff; |
| 223 | ch = (regs->regs[55]) >> 32; |
| 224 | cl = (regs->regs[55]) & 0xffffffff; |
| 225 | printk("R53 : %08Lx%08Lx R54 : %08Lx%08Lx R55 : %08Lx%08Lx\n", |
| 226 | ah, al, bh, bl, ch, cl); |
| 227 | |
| 228 | ah = (regs->regs[56]) >> 32; |
| 229 | al = (regs->regs[56]) & 0xffffffff; |
| 230 | bh = (regs->regs[57]) >> 32; |
| 231 | bl = (regs->regs[57]) & 0xffffffff; |
| 232 | ch = (regs->regs[58]) >> 32; |
| 233 | cl = (regs->regs[58]) & 0xffffffff; |
| 234 | printk("R56 : %08Lx%08Lx R57 : %08Lx%08Lx R58 : %08Lx%08Lx\n", |
| 235 | ah, al, bh, bl, ch, cl); |
| 236 | |
| 237 | ah = (regs->regs[59]) >> 32; |
| 238 | al = (regs->regs[59]) & 0xffffffff; |
| 239 | bh = (regs->regs[60]) >> 32; |
| 240 | bl = (regs->regs[60]) & 0xffffffff; |
| 241 | ch = (regs->regs[61]) >> 32; |
| 242 | cl = (regs->regs[61]) & 0xffffffff; |
| 243 | printk("R59 : %08Lx%08Lx R60 : %08Lx%08Lx R61 : %08Lx%08Lx\n", |
| 244 | ah, al, bh, bl, ch, cl); |
| 245 | |
| 246 | ah = (regs->regs[62]) >> 32; |
| 247 | al = (regs->regs[62]) & 0xffffffff; |
| 248 | bh = (regs->tregs[0]) >> 32; |
| 249 | bl = (regs->tregs[0]) & 0xffffffff; |
| 250 | ch = (regs->tregs[1]) >> 32; |
| 251 | cl = (regs->tregs[1]) & 0xffffffff; |
| 252 | printk("R62 : %08Lx%08Lx T0 : %08Lx%08Lx T1 : %08Lx%08Lx\n", |
| 253 | ah, al, bh, bl, ch, cl); |
| 254 | |
| 255 | ah = (regs->tregs[2]) >> 32; |
| 256 | al = (regs->tregs[2]) & 0xffffffff; |
| 257 | bh = (regs->tregs[3]) >> 32; |
| 258 | bl = (regs->tregs[3]) & 0xffffffff; |
| 259 | ch = (regs->tregs[4]) >> 32; |
| 260 | cl = (regs->tregs[4]) & 0xffffffff; |
| 261 | printk("T2 : %08Lx%08Lx T3 : %08Lx%08Lx T4 : %08Lx%08Lx\n", |
| 262 | ah, al, bh, bl, ch, cl); |
| 263 | |
| 264 | ah = (regs->tregs[5]) >> 32; |
| 265 | al = (regs->tregs[5]) & 0xffffffff; |
| 266 | bh = (regs->tregs[6]) >> 32; |
| 267 | bl = (regs->tregs[6]) & 0xffffffff; |
| 268 | ch = (regs->tregs[7]) >> 32; |
| 269 | cl = (regs->tregs[7]) & 0xffffffff; |
| 270 | printk("T5 : %08Lx%08Lx T6 : %08Lx%08Lx T7 : %08Lx%08Lx\n", |
| 271 | ah, al, bh, bl, ch, cl); |
| 272 | |
| 273 | /* |
| 274 | * If we're in kernel mode, dump the stack too.. |
| 275 | */ |
| 276 | if (!user_mode(regs)) { |
| 277 | void show_stack(struct task_struct *tsk, unsigned long *sp); |
| 278 | unsigned long sp = regs->regs[15] & 0xffffffff; |
| 279 | struct task_struct *tsk = get_current(); |
| 280 | |
| 281 | tsk->thread.kregs = regs; |
| 282 | |
| 283 | show_stack(tsk, (unsigned long *)sp); |
| 284 | } |
| 285 | } |
| 286 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | /* |
| 288 | * Create a kernel thread |
| 289 | */ |
Joe Perches | ff2d8b1 | 2012-01-12 17:17:21 -0800 | [diff] [blame] | 290 | __noreturn void kernel_thread_helper(void *arg, int (*fn)(void *)) |
Arnd Bergmann | 821278a | 2006-10-02 02:18:41 -0700 | [diff] [blame] | 291 | { |
| 292 | do_exit(fn(arg)); |
| 293 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | |
| 295 | /* |
| 296 | * This is the mechanism for creating a new kernel thread. |
| 297 | * |
| 298 | * NOTE! Only a kernel-only process(ie the swapper or direct descendants |
| 299 | * who haven't done an "execve()") should use this: it will work within |
| 300 | * a system call from a "real" process, but the process memory space will |
Simon Arlott | 0a35477 | 2007-05-14 08:25:48 +0900 | [diff] [blame] | 301 | * not be freed until both the parent and the child have exited. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | */ |
| 303 | int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) |
| 304 | { |
Arnd Bergmann | 821278a | 2006-10-02 02:18:41 -0700 | [diff] [blame] | 305 | struct pt_regs regs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | |
Arnd Bergmann | 821278a | 2006-10-02 02:18:41 -0700 | [diff] [blame] | 307 | memset(®s, 0, sizeof(regs)); |
| 308 | regs.regs[2] = (unsigned long)arg; |
| 309 | regs.regs[3] = (unsigned long)fn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | |
Arnd Bergmann | 821278a | 2006-10-02 02:18:41 -0700 | [diff] [blame] | 311 | regs.pc = (unsigned long)kernel_thread_helper; |
| 312 | regs.sr = (1 << 30); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | |
Paul Mundt | 3d58695 | 2008-09-21 13:56:39 +0900 | [diff] [blame] | 314 | /* Ok, create the new process.. */ |
Christoph Hellwig | 4505ffd | 2009-06-18 13:38:26 +0900 | [diff] [blame] | 315 | return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, |
Paul Mundt | 3d58695 | 2008-09-21 13:56:39 +0900 | [diff] [blame] | 316 | ®s, 0, NULL, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | } |
Paul Mundt | 4c978ca | 2009-10-27 11:51:19 +0900 | [diff] [blame] | 318 | EXPORT_SYMBOL(kernel_thread); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | |
| 320 | /* |
| 321 | * Free current thread data structures etc.. |
| 322 | */ |
| 323 | void exit_thread(void) |
| 324 | { |
Paul Mundt | a23ba43 | 2007-11-28 20:19:38 +0900 | [diff] [blame] | 325 | /* |
| 326 | * See arch/sparc/kernel/process.c for the precedent for doing |
| 327 | * this -- RPC. |
| 328 | * |
| 329 | * The SH-5 FPU save/restore approach relies on |
| 330 | * last_task_used_math pointing to a live task_struct. When |
| 331 | * another task tries to use the FPU for the 1st time, the FPUDIS |
| 332 | * trap handling (see arch/sh/kernel/cpu/sh5/fpu.c) will save the |
| 333 | * existing FPU state to the FP regs field within |
| 334 | * last_task_used_math before re-loading the new task's FPU state |
| 335 | * (or initialising it if the FPU has been used before). So if |
| 336 | * last_task_used_math is stale, and its page has already been |
| 337 | * re-allocated for another use, the consequences are rather |
| 338 | * grim. Unless we null it here, there is no other path through |
| 339 | * which it would get safely nulled. |
| 340 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | #ifdef CONFIG_SH_FPU |
| 342 | if (last_task_used_math == current) { |
| 343 | last_task_used_math = NULL; |
| 344 | } |
| 345 | #endif |
| 346 | } |
| 347 | |
| 348 | void flush_thread(void) |
| 349 | { |
| 350 | |
Linus Torvalds | 221af7f | 2010-01-28 22:14:42 -0800 | [diff] [blame] | 351 | /* Called by fs/exec.c (setup_new_exec) to remove traces of a |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | * previously running executable. */ |
| 353 | #ifdef CONFIG_SH_FPU |
| 354 | if (last_task_used_math == current) { |
| 355 | last_task_used_math = NULL; |
| 356 | } |
| 357 | /* Force FPU state to be reinitialised after exec */ |
| 358 | clear_used_math(); |
| 359 | #endif |
| 360 | |
| 361 | /* if we are a kernel thread, about to change to user thread, |
| 362 | * update kreg |
| 363 | */ |
| 364 | if(current->thread.kregs==&fake_swapper_regs) { |
| 365 | current->thread.kregs = |
| 366 | ((struct pt_regs *)(THREAD_SIZE + (unsigned long) current) - 1); |
| 367 | current->thread.uregs = current->thread.kregs; |
| 368 | } |
| 369 | } |
| 370 | |
| 371 | void release_thread(struct task_struct *dead_task) |
| 372 | { |
| 373 | /* do nothing */ |
| 374 | } |
| 375 | |
| 376 | /* Fill in the fpu structure for a core dump.. */ |
| 377 | int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu) |
| 378 | { |
| 379 | #ifdef CONFIG_SH_FPU |
| 380 | int fpvalid; |
| 381 | struct task_struct *tsk = current; |
| 382 | |
| 383 | fpvalid = !!tsk_used_math(tsk); |
| 384 | if (fpvalid) { |
| 385 | if (current == last_task_used_math) { |
Paul Mundt | 600ee24 | 2007-11-19 19:13:38 +0900 | [diff] [blame] | 386 | enable_fpu(); |
Matt Fleming | 61cc7b0 | 2009-12-14 20:12:04 +0000 | [diff] [blame] | 387 | save_fpu(tsk); |
Paul Mundt | 600ee24 | 2007-11-19 19:13:38 +0900 | [diff] [blame] | 388 | disable_fpu(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | last_task_used_math = 0; |
| 390 | regs->sr |= SR_FD; |
| 391 | } |
| 392 | |
Paul Mundt | 3ef2932 | 2010-01-19 15:40:03 +0900 | [diff] [blame] | 393 | memcpy(fpu, &tsk->thread.xstate->hardfpu, sizeof(*fpu)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | } |
| 395 | |
| 396 | return fpvalid; |
| 397 | #else |
| 398 | return 0; /* Task didn't use the fpu at all. */ |
| 399 | #endif |
| 400 | } |
Paul Mundt | 4c978ca | 2009-10-27 11:51:19 +0900 | [diff] [blame] | 401 | EXPORT_SYMBOL(dump_fpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | |
| 403 | asmlinkage void ret_from_fork(void); |
| 404 | |
Alexey Dobriyan | 6f2c55b | 2009-04-02 16:56:59 -0700 | [diff] [blame] | 405 | int copy_thread(unsigned long clone_flags, unsigned long usp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | unsigned long unused, |
| 407 | struct task_struct *p, struct pt_regs *regs) |
| 408 | { |
| 409 | struct pt_regs *childregs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | |
| 411 | #ifdef CONFIG_SH_FPU |
| 412 | if(last_task_used_math == current) { |
Paul Mundt | 600ee24 | 2007-11-19 19:13:38 +0900 | [diff] [blame] | 413 | enable_fpu(); |
Matt Fleming | 61cc7b0 | 2009-12-14 20:12:04 +0000 | [diff] [blame] | 414 | save_fpu(current); |
Paul Mundt | 600ee24 | 2007-11-19 19:13:38 +0900 | [diff] [blame] | 415 | disable_fpu(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | last_task_used_math = NULL; |
| 417 | regs->sr |= SR_FD; |
| 418 | } |
| 419 | #endif |
| 420 | /* Copy from sh version */ |
Al Viro | ee8c1dd | 2006-01-12 01:06:01 -0800 | [diff] [blame] | 421 | childregs = (struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | |
| 423 | *childregs = *regs; |
| 424 | |
Paul Mundt | c791483 | 2009-08-04 17:14:39 +0900 | [diff] [blame] | 425 | /* |
| 426 | * Sign extend the edited stack. |
| 427 | * Note that thread.pc and thread.pc will stay |
| 428 | * 32-bit wide and context switch must take care |
| 429 | * of NEFF sign extension. |
| 430 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | if (user_mode(regs)) { |
Paul Mundt | c791483 | 2009-08-04 17:14:39 +0900 | [diff] [blame] | 432 | childregs->regs[15] = neff_sign_extend(usp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | p->thread.uregs = childregs; |
| 434 | } else { |
Paul Mundt | c791483 | 2009-08-04 17:14:39 +0900 | [diff] [blame] | 435 | childregs->regs[15] = |
| 436 | neff_sign_extend((unsigned long)task_stack_page(p) + |
| 437 | THREAD_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | } |
| 439 | |
| 440 | childregs->regs[9] = 0; /* Set return value for child */ |
| 441 | childregs->sr |= SR_FD; /* Invalidate FPU flag */ |
| 442 | |
| 443 | p->thread.sp = (unsigned long) childregs; |
| 444 | p->thread.pc = (unsigned long) ret_from_fork; |
| 445 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | return 0; |
| 447 | } |
| 448 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | asmlinkage int sys_fork(unsigned long r2, unsigned long r3, |
| 450 | unsigned long r4, unsigned long r5, |
| 451 | unsigned long r6, unsigned long r7, |
| 452 | struct pt_regs *pregs) |
| 453 | { |
| 454 | return do_fork(SIGCHLD, pregs->regs[15], pregs, 0, 0, 0); |
| 455 | } |
| 456 | |
| 457 | asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp, |
| 458 | unsigned long r4, unsigned long r5, |
| 459 | unsigned long r6, unsigned long r7, |
| 460 | struct pt_regs *pregs) |
| 461 | { |
| 462 | if (!newsp) |
| 463 | newsp = pregs->regs[15]; |
| 464 | return do_fork(clone_flags, newsp, pregs, 0, 0, 0); |
| 465 | } |
| 466 | |
| 467 | /* |
| 468 | * This is trivial, and on the face of it looks like it |
| 469 | * could equally well be done in user mode. |
| 470 | * |
| 471 | * Not so, for quite unobvious reasons - register pressure. |
| 472 | * In user mode vfork() cannot have a stack frame, and if |
| 473 | * done by calling the "clone()" system call directly, you |
| 474 | * do not have enough call-clobbered registers to hold all |
| 475 | * the information you need. |
| 476 | */ |
| 477 | asmlinkage int sys_vfork(unsigned long r2, unsigned long r3, |
| 478 | unsigned long r4, unsigned long r5, |
| 479 | unsigned long r6, unsigned long r7, |
| 480 | struct pt_regs *pregs) |
| 481 | { |
| 482 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, pregs->regs[15], pregs, 0, 0, 0); |
| 483 | } |
| 484 | |
| 485 | /* |
| 486 | * sys_execve() executes a new program. |
| 487 | */ |
David Howells | c788732 | 2010-08-11 11:26:22 +0100 | [diff] [blame] | 488 | asmlinkage int sys_execve(const char *ufilename, char **uargv, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | char **uenvp, unsigned long r5, |
| 490 | unsigned long r6, unsigned long r7, |
| 491 | struct pt_regs *pregs) |
| 492 | { |
| 493 | int error; |
Jeff Layton | 91a27b2 | 2012-10-10 15:25:28 -0400 | [diff] [blame^] | 494 | struct filename *filename; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | filename = getname((char __user *)ufilename); |
| 497 | error = PTR_ERR(filename); |
| 498 | if (IS_ERR(filename)) |
| 499 | goto out; |
| 500 | |
Jeff Layton | 91a27b2 | 2012-10-10 15:25:28 -0400 | [diff] [blame^] | 501 | error = do_execve(filename->name, |
David Howells | d762746 | 2010-08-17 23:52:56 +0100 | [diff] [blame] | 502 | (const char __user *const __user *)uargv, |
| 503 | (const char __user *const __user *)uenvp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | pregs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | putname(filename); |
| 506 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | return error; |
| 508 | } |
| 509 | |
Paul Mundt | 43081e1 | 2008-02-12 17:02:08 +0900 | [diff] [blame] | 510 | #ifdef CONFIG_FRAME_POINTER |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | static int in_sh64_switch_to(unsigned long pc) |
| 512 | { |
| 513 | extern char __sh64_switch_to_end; |
| 514 | /* For a sleeping task, the PC is somewhere in the middle of the function, |
| 515 | so we don't have to worry about masking the LSB off */ |
| 516 | return (pc >= (unsigned long) sh64_switch_to) && |
| 517 | (pc < (unsigned long) &__sh64_switch_to_end); |
| 518 | } |
Paul Mundt | 43081e1 | 2008-02-12 17:02:08 +0900 | [diff] [blame] | 519 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | |
| 521 | unsigned long get_wchan(struct task_struct *p) |
| 522 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | unsigned long pc; |
| 524 | |
| 525 | if (!p || p == current || p->state == TASK_RUNNING) |
| 526 | return 0; |
| 527 | |
| 528 | /* |
| 529 | * The same comment as on the Alpha applies here, too ... |
| 530 | */ |
| 531 | pc = thread_saved_pc(p); |
| 532 | |
| 533 | #ifdef CONFIG_FRAME_POINTER |
| 534 | if (in_sh64_switch_to(pc)) { |
Paul Mundt | 43081e1 | 2008-02-12 17:02:08 +0900 | [diff] [blame] | 535 | unsigned long schedule_fp; |
| 536 | unsigned long sh64_switch_to_fp; |
| 537 | unsigned long schedule_caller_pc; |
| 538 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | sh64_switch_to_fp = (long) p->thread.sp; |
| 540 | /* r14 is saved at offset 4 in the sh64_switch_to frame */ |
| 541 | schedule_fp = *(unsigned long *) (long)(sh64_switch_to_fp + 4); |
| 542 | |
| 543 | /* and the caller of 'schedule' is (currently!) saved at offset 24 |
| 544 | in the frame of schedule (from disasm) */ |
| 545 | schedule_caller_pc = *(unsigned long *) (long)(schedule_fp + 24); |
| 546 | return schedule_caller_pc; |
| 547 | } |
| 548 | #endif |
| 549 | return pc; |
| 550 | } |