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> |
| 24 | #include <linux/init.h> |
Arnd Bergmann | 821278a | 2006-10-02 02:18:41 -0700 | [diff] [blame] | 25 | #include <linux/module.h> |
Paul Mundt | c26056b | 2007-11-05 12:18:17 +0900 | [diff] [blame] | 26 | #include <linux/proc_fs.h> |
Paul Mundt | a7aa92d1b49 | 2007-11-20 15:38:50 +0900 | [diff] [blame] | 27 | #include <linux/io.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <asm/uaccess.h> |
| 29 | #include <asm/pgtable.h> |
Paul Mundt | df0fb25 | 2007-11-21 17:07:46 +0900 | [diff] [blame] | 30 | #include <asm/mmu_context.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | |
| 32 | struct task_struct *last_task_used_math = NULL; |
| 33 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | static int hlt_counter = 1; |
| 35 | |
| 36 | #define HARD_IDLE_TIMEOUT (HZ / 3) |
| 37 | |
| 38 | void disable_hlt(void) |
| 39 | { |
| 40 | hlt_counter++; |
| 41 | } |
| 42 | |
| 43 | void enable_hlt(void) |
| 44 | { |
| 45 | hlt_counter--; |
| 46 | } |
| 47 | |
| 48 | static int __init nohlt_setup(char *__unused) |
| 49 | { |
| 50 | hlt_counter = 1; |
| 51 | return 1; |
| 52 | } |
| 53 | |
| 54 | static int __init hlt_setup(char *__unused) |
| 55 | { |
| 56 | hlt_counter = 0; |
| 57 | return 1; |
| 58 | } |
| 59 | |
| 60 | __setup("nohlt", nohlt_setup); |
| 61 | __setup("hlt", hlt_setup); |
| 62 | |
| 63 | static inline void hlt(void) |
| 64 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | __asm__ __volatile__ ("sleep" : : : "memory"); |
| 66 | } |
| 67 | |
| 68 | /* |
| 69 | * The idle loop on a uniprocessor SH.. |
| 70 | */ |
Nick Piggin | 64c7c8f | 2005-11-08 21:39:04 -0800 | [diff] [blame] | 71 | void cpu_idle(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | { |
| 73 | /* endless idle loop with no priority at all */ |
| 74 | while (1) { |
| 75 | if (hlt_counter) { |
Nick Piggin | 64c7c8f | 2005-11-08 21:39:04 -0800 | [diff] [blame] | 76 | while (!need_resched()) |
| 77 | cpu_relax(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | } else { |
| 79 | local_irq_disable(); |
| 80 | while (!need_resched()) { |
| 81 | local_irq_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | hlt(); |
| 83 | local_irq_disable(); |
| 84 | } |
| 85 | local_irq_enable(); |
| 86 | } |
Nick Piggin | 5bfb5d6 | 2005-11-08 21:39:01 -0800 | [diff] [blame] | 87 | preempt_enable_no_resched(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | schedule(); |
Nick Piggin | 5bfb5d6 | 2005-11-08 21:39:01 -0800 | [diff] [blame] | 89 | preempt_disable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | } |
| 93 | |
| 94 | void machine_restart(char * __unused) |
| 95 | { |
| 96 | extern void phys_stext(void); |
| 97 | |
| 98 | phys_stext(); |
| 99 | } |
| 100 | |
| 101 | void machine_halt(void) |
| 102 | { |
| 103 | for (;;); |
| 104 | } |
| 105 | |
| 106 | void machine_power_off(void) |
| 107 | { |
Paul Mundt | a7aa92d1b49 | 2007-11-20 15:38:50 +0900 | [diff] [blame] | 108 | #if 0 |
| 109 | /* Disable watchdog timer */ |
| 110 | ctrl_outl(0xa5000000, WTCSR); |
| 111 | /* Configure deep standby on sleep */ |
| 112 | ctrl_outl(0x03, STBCR); |
| 113 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | |
Paul Mundt | a7aa92d1b49 | 2007-11-20 15:38:50 +0900 | [diff] [blame] | 115 | __asm__ __volatile__ ( |
| 116 | "sleep\n\t" |
| 117 | "synci\n\t" |
| 118 | "nop;nop;nop;nop\n\t" |
| 119 | ); |
| 120 | |
| 121 | panic("Unexpected wakeup!\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | } |
| 123 | |
Paul Mundt | 1bb99a6 | 2006-09-12 14:40:09 +0900 | [diff] [blame] | 124 | void (*pm_power_off)(void) = machine_power_off; |
| 125 | EXPORT_SYMBOL(pm_power_off); |
| 126 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | void show_regs(struct pt_regs * regs) |
| 128 | { |
| 129 | unsigned long long ah, al, bh, bl, ch, cl; |
| 130 | |
| 131 | printk("\n"); |
| 132 | |
| 133 | ah = (regs->pc) >> 32; |
| 134 | al = (regs->pc) & 0xffffffff; |
| 135 | bh = (regs->regs[18]) >> 32; |
| 136 | bl = (regs->regs[18]) & 0xffffffff; |
| 137 | ch = (regs->regs[15]) >> 32; |
| 138 | cl = (regs->regs[15]) & 0xffffffff; |
| 139 | printk("PC : %08Lx%08Lx LINK: %08Lx%08Lx SP : %08Lx%08Lx\n", |
| 140 | ah, al, bh, bl, ch, cl); |
| 141 | |
| 142 | ah = (regs->sr) >> 32; |
| 143 | al = (regs->sr) & 0xffffffff; |
| 144 | asm volatile ("getcon " __TEA ", %0" : "=r" (bh)); |
| 145 | asm volatile ("getcon " __TEA ", %0" : "=r" (bl)); |
| 146 | bh = (bh) >> 32; |
| 147 | bl = (bl) & 0xffffffff; |
| 148 | asm volatile ("getcon " __KCR0 ", %0" : "=r" (ch)); |
| 149 | asm volatile ("getcon " __KCR0 ", %0" : "=r" (cl)); |
| 150 | ch = (ch) >> 32; |
| 151 | cl = (cl) & 0xffffffff; |
| 152 | printk("SR : %08Lx%08Lx TEA : %08Lx%08Lx KCR0: %08Lx%08Lx\n", |
| 153 | ah, al, bh, bl, ch, cl); |
| 154 | |
| 155 | ah = (regs->regs[0]) >> 32; |
| 156 | al = (regs->regs[0]) & 0xffffffff; |
| 157 | bh = (regs->regs[1]) >> 32; |
| 158 | bl = (regs->regs[1]) & 0xffffffff; |
| 159 | ch = (regs->regs[2]) >> 32; |
| 160 | cl = (regs->regs[2]) & 0xffffffff; |
| 161 | printk("R0 : %08Lx%08Lx R1 : %08Lx%08Lx R2 : %08Lx%08Lx\n", |
| 162 | ah, al, bh, bl, ch, cl); |
| 163 | |
| 164 | ah = (regs->regs[3]) >> 32; |
| 165 | al = (regs->regs[3]) & 0xffffffff; |
| 166 | bh = (regs->regs[4]) >> 32; |
| 167 | bl = (regs->regs[4]) & 0xffffffff; |
| 168 | ch = (regs->regs[5]) >> 32; |
| 169 | cl = (regs->regs[5]) & 0xffffffff; |
| 170 | printk("R3 : %08Lx%08Lx R4 : %08Lx%08Lx R5 : %08Lx%08Lx\n", |
| 171 | ah, al, bh, bl, ch, cl); |
| 172 | |
| 173 | ah = (regs->regs[6]) >> 32; |
| 174 | al = (regs->regs[6]) & 0xffffffff; |
| 175 | bh = (regs->regs[7]) >> 32; |
| 176 | bl = (regs->regs[7]) & 0xffffffff; |
| 177 | ch = (regs->regs[8]) >> 32; |
| 178 | cl = (regs->regs[8]) & 0xffffffff; |
| 179 | printk("R6 : %08Lx%08Lx R7 : %08Lx%08Lx R8 : %08Lx%08Lx\n", |
| 180 | ah, al, bh, bl, ch, cl); |
| 181 | |
| 182 | ah = (regs->regs[9]) >> 32; |
| 183 | al = (regs->regs[9]) & 0xffffffff; |
| 184 | bh = (regs->regs[10]) >> 32; |
| 185 | bl = (regs->regs[10]) & 0xffffffff; |
| 186 | ch = (regs->regs[11]) >> 32; |
| 187 | cl = (regs->regs[11]) & 0xffffffff; |
| 188 | printk("R9 : %08Lx%08Lx R10 : %08Lx%08Lx R11 : %08Lx%08Lx\n", |
| 189 | ah, al, bh, bl, ch, cl); |
| 190 | |
| 191 | ah = (regs->regs[12]) >> 32; |
| 192 | al = (regs->regs[12]) & 0xffffffff; |
| 193 | bh = (regs->regs[13]) >> 32; |
| 194 | bl = (regs->regs[13]) & 0xffffffff; |
| 195 | ch = (regs->regs[14]) >> 32; |
| 196 | cl = (regs->regs[14]) & 0xffffffff; |
| 197 | printk("R12 : %08Lx%08Lx R13 : %08Lx%08Lx R14 : %08Lx%08Lx\n", |
| 198 | ah, al, bh, bl, ch, cl); |
| 199 | |
| 200 | ah = (regs->regs[16]) >> 32; |
| 201 | al = (regs->regs[16]) & 0xffffffff; |
| 202 | bh = (regs->regs[17]) >> 32; |
| 203 | bl = (regs->regs[17]) & 0xffffffff; |
| 204 | ch = (regs->regs[19]) >> 32; |
| 205 | cl = (regs->regs[19]) & 0xffffffff; |
| 206 | printk("R16 : %08Lx%08Lx R17 : %08Lx%08Lx R19 : %08Lx%08Lx\n", |
| 207 | ah, al, bh, bl, ch, cl); |
| 208 | |
| 209 | ah = (regs->regs[20]) >> 32; |
| 210 | al = (regs->regs[20]) & 0xffffffff; |
| 211 | bh = (regs->regs[21]) >> 32; |
| 212 | bl = (regs->regs[21]) & 0xffffffff; |
| 213 | ch = (regs->regs[22]) >> 32; |
| 214 | cl = (regs->regs[22]) & 0xffffffff; |
| 215 | printk("R20 : %08Lx%08Lx R21 : %08Lx%08Lx R22 : %08Lx%08Lx\n", |
| 216 | ah, al, bh, bl, ch, cl); |
| 217 | |
| 218 | ah = (regs->regs[23]) >> 32; |
| 219 | al = (regs->regs[23]) & 0xffffffff; |
| 220 | bh = (regs->regs[24]) >> 32; |
| 221 | bl = (regs->regs[24]) & 0xffffffff; |
| 222 | ch = (regs->regs[25]) >> 32; |
| 223 | cl = (regs->regs[25]) & 0xffffffff; |
| 224 | printk("R23 : %08Lx%08Lx R24 : %08Lx%08Lx R25 : %08Lx%08Lx\n", |
| 225 | ah, al, bh, bl, ch, cl); |
| 226 | |
| 227 | ah = (regs->regs[26]) >> 32; |
| 228 | al = (regs->regs[26]) & 0xffffffff; |
| 229 | bh = (regs->regs[27]) >> 32; |
| 230 | bl = (regs->regs[27]) & 0xffffffff; |
| 231 | ch = (regs->regs[28]) >> 32; |
| 232 | cl = (regs->regs[28]) & 0xffffffff; |
| 233 | printk("R26 : %08Lx%08Lx R27 : %08Lx%08Lx R28 : %08Lx%08Lx\n", |
| 234 | ah, al, bh, bl, ch, cl); |
| 235 | |
| 236 | ah = (regs->regs[29]) >> 32; |
| 237 | al = (regs->regs[29]) & 0xffffffff; |
| 238 | bh = (regs->regs[30]) >> 32; |
| 239 | bl = (regs->regs[30]) & 0xffffffff; |
| 240 | ch = (regs->regs[31]) >> 32; |
| 241 | cl = (regs->regs[31]) & 0xffffffff; |
| 242 | printk("R29 : %08Lx%08Lx R30 : %08Lx%08Lx R31 : %08Lx%08Lx\n", |
| 243 | ah, al, bh, bl, ch, cl); |
| 244 | |
| 245 | ah = (regs->regs[32]) >> 32; |
| 246 | al = (regs->regs[32]) & 0xffffffff; |
| 247 | bh = (regs->regs[33]) >> 32; |
| 248 | bl = (regs->regs[33]) & 0xffffffff; |
| 249 | ch = (regs->regs[34]) >> 32; |
| 250 | cl = (regs->regs[34]) & 0xffffffff; |
| 251 | printk("R32 : %08Lx%08Lx R33 : %08Lx%08Lx R34 : %08Lx%08Lx\n", |
| 252 | ah, al, bh, bl, ch, cl); |
| 253 | |
| 254 | ah = (regs->regs[35]) >> 32; |
| 255 | al = (regs->regs[35]) & 0xffffffff; |
| 256 | bh = (regs->regs[36]) >> 32; |
| 257 | bl = (regs->regs[36]) & 0xffffffff; |
| 258 | ch = (regs->regs[37]) >> 32; |
| 259 | cl = (regs->regs[37]) & 0xffffffff; |
| 260 | printk("R35 : %08Lx%08Lx R36 : %08Lx%08Lx R37 : %08Lx%08Lx\n", |
| 261 | ah, al, bh, bl, ch, cl); |
| 262 | |
| 263 | ah = (regs->regs[38]) >> 32; |
| 264 | al = (regs->regs[38]) & 0xffffffff; |
| 265 | bh = (regs->regs[39]) >> 32; |
| 266 | bl = (regs->regs[39]) & 0xffffffff; |
| 267 | ch = (regs->regs[40]) >> 32; |
| 268 | cl = (regs->regs[40]) & 0xffffffff; |
| 269 | printk("R38 : %08Lx%08Lx R39 : %08Lx%08Lx R40 : %08Lx%08Lx\n", |
| 270 | ah, al, bh, bl, ch, cl); |
| 271 | |
| 272 | ah = (regs->regs[41]) >> 32; |
| 273 | al = (regs->regs[41]) & 0xffffffff; |
| 274 | bh = (regs->regs[42]) >> 32; |
| 275 | bl = (regs->regs[42]) & 0xffffffff; |
| 276 | ch = (regs->regs[43]) >> 32; |
| 277 | cl = (regs->regs[43]) & 0xffffffff; |
| 278 | printk("R41 : %08Lx%08Lx R42 : %08Lx%08Lx R43 : %08Lx%08Lx\n", |
| 279 | ah, al, bh, bl, ch, cl); |
| 280 | |
| 281 | ah = (regs->regs[44]) >> 32; |
| 282 | al = (regs->regs[44]) & 0xffffffff; |
| 283 | bh = (regs->regs[45]) >> 32; |
| 284 | bl = (regs->regs[45]) & 0xffffffff; |
| 285 | ch = (regs->regs[46]) >> 32; |
| 286 | cl = (regs->regs[46]) & 0xffffffff; |
| 287 | printk("R44 : %08Lx%08Lx R45 : %08Lx%08Lx R46 : %08Lx%08Lx\n", |
| 288 | ah, al, bh, bl, ch, cl); |
| 289 | |
| 290 | ah = (regs->regs[47]) >> 32; |
| 291 | al = (regs->regs[47]) & 0xffffffff; |
| 292 | bh = (regs->regs[48]) >> 32; |
| 293 | bl = (regs->regs[48]) & 0xffffffff; |
| 294 | ch = (regs->regs[49]) >> 32; |
| 295 | cl = (regs->regs[49]) & 0xffffffff; |
| 296 | printk("R47 : %08Lx%08Lx R48 : %08Lx%08Lx R49 : %08Lx%08Lx\n", |
| 297 | ah, al, bh, bl, ch, cl); |
| 298 | |
| 299 | ah = (regs->regs[50]) >> 32; |
| 300 | al = (regs->regs[50]) & 0xffffffff; |
| 301 | bh = (regs->regs[51]) >> 32; |
| 302 | bl = (regs->regs[51]) & 0xffffffff; |
| 303 | ch = (regs->regs[52]) >> 32; |
| 304 | cl = (regs->regs[52]) & 0xffffffff; |
| 305 | printk("R50 : %08Lx%08Lx R51 : %08Lx%08Lx R52 : %08Lx%08Lx\n", |
| 306 | ah, al, bh, bl, ch, cl); |
| 307 | |
| 308 | ah = (regs->regs[53]) >> 32; |
| 309 | al = (regs->regs[53]) & 0xffffffff; |
| 310 | bh = (regs->regs[54]) >> 32; |
| 311 | bl = (regs->regs[54]) & 0xffffffff; |
| 312 | ch = (regs->regs[55]) >> 32; |
| 313 | cl = (regs->regs[55]) & 0xffffffff; |
| 314 | printk("R53 : %08Lx%08Lx R54 : %08Lx%08Lx R55 : %08Lx%08Lx\n", |
| 315 | ah, al, bh, bl, ch, cl); |
| 316 | |
| 317 | ah = (regs->regs[56]) >> 32; |
| 318 | al = (regs->regs[56]) & 0xffffffff; |
| 319 | bh = (regs->regs[57]) >> 32; |
| 320 | bl = (regs->regs[57]) & 0xffffffff; |
| 321 | ch = (regs->regs[58]) >> 32; |
| 322 | cl = (regs->regs[58]) & 0xffffffff; |
| 323 | printk("R56 : %08Lx%08Lx R57 : %08Lx%08Lx R58 : %08Lx%08Lx\n", |
| 324 | ah, al, bh, bl, ch, cl); |
| 325 | |
| 326 | ah = (regs->regs[59]) >> 32; |
| 327 | al = (regs->regs[59]) & 0xffffffff; |
| 328 | bh = (regs->regs[60]) >> 32; |
| 329 | bl = (regs->regs[60]) & 0xffffffff; |
| 330 | ch = (regs->regs[61]) >> 32; |
| 331 | cl = (regs->regs[61]) & 0xffffffff; |
| 332 | printk("R59 : %08Lx%08Lx R60 : %08Lx%08Lx R61 : %08Lx%08Lx\n", |
| 333 | ah, al, bh, bl, ch, cl); |
| 334 | |
| 335 | ah = (regs->regs[62]) >> 32; |
| 336 | al = (regs->regs[62]) & 0xffffffff; |
| 337 | bh = (regs->tregs[0]) >> 32; |
| 338 | bl = (regs->tregs[0]) & 0xffffffff; |
| 339 | ch = (regs->tregs[1]) >> 32; |
| 340 | cl = (regs->tregs[1]) & 0xffffffff; |
| 341 | printk("R62 : %08Lx%08Lx T0 : %08Lx%08Lx T1 : %08Lx%08Lx\n", |
| 342 | ah, al, bh, bl, ch, cl); |
| 343 | |
| 344 | ah = (regs->tregs[2]) >> 32; |
| 345 | al = (regs->tregs[2]) & 0xffffffff; |
| 346 | bh = (regs->tregs[3]) >> 32; |
| 347 | bl = (regs->tregs[3]) & 0xffffffff; |
| 348 | ch = (regs->tregs[4]) >> 32; |
| 349 | cl = (regs->tregs[4]) & 0xffffffff; |
| 350 | printk("T2 : %08Lx%08Lx T3 : %08Lx%08Lx T4 : %08Lx%08Lx\n", |
| 351 | ah, al, bh, bl, ch, cl); |
| 352 | |
| 353 | ah = (regs->tregs[5]) >> 32; |
| 354 | al = (regs->tregs[5]) & 0xffffffff; |
| 355 | bh = (regs->tregs[6]) >> 32; |
| 356 | bl = (regs->tregs[6]) & 0xffffffff; |
| 357 | ch = (regs->tregs[7]) >> 32; |
| 358 | cl = (regs->tregs[7]) & 0xffffffff; |
| 359 | printk("T5 : %08Lx%08Lx T6 : %08Lx%08Lx T7 : %08Lx%08Lx\n", |
| 360 | ah, al, bh, bl, ch, cl); |
| 361 | |
| 362 | /* |
| 363 | * If we're in kernel mode, dump the stack too.. |
| 364 | */ |
| 365 | if (!user_mode(regs)) { |
| 366 | void show_stack(struct task_struct *tsk, unsigned long *sp); |
| 367 | unsigned long sp = regs->regs[15] & 0xffffffff; |
| 368 | struct task_struct *tsk = get_current(); |
| 369 | |
| 370 | tsk->thread.kregs = regs; |
| 371 | |
| 372 | show_stack(tsk, (unsigned long *)sp); |
| 373 | } |
| 374 | } |
| 375 | |
| 376 | struct task_struct * alloc_task_struct(void) |
| 377 | { |
| 378 | /* Get task descriptor pages */ |
| 379 | return (struct task_struct *) |
| 380 | __get_free_pages(GFP_KERNEL, get_order(THREAD_SIZE)); |
| 381 | } |
| 382 | |
| 383 | void free_task_struct(struct task_struct *p) |
| 384 | { |
| 385 | free_pages((unsigned long) p, get_order(THREAD_SIZE)); |
| 386 | } |
| 387 | |
| 388 | /* |
| 389 | * Create a kernel thread |
| 390 | */ |
Arnd Bergmann | 821278a | 2006-10-02 02:18:41 -0700 | [diff] [blame] | 391 | ATTRIB_NORET void kernel_thread_helper(void *arg, int (*fn)(void *)) |
| 392 | { |
| 393 | do_exit(fn(arg)); |
| 394 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | |
| 396 | /* |
| 397 | * This is the mechanism for creating a new kernel thread. |
| 398 | * |
| 399 | * NOTE! Only a kernel-only process(ie the swapper or direct descendants |
| 400 | * who haven't done an "execve()") should use this: it will work within |
| 401 | * 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] | 402 | * not be freed until both the parent and the child have exited. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | */ |
| 404 | int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) |
| 405 | { |
Arnd Bergmann | 821278a | 2006-10-02 02:18:41 -0700 | [diff] [blame] | 406 | struct pt_regs regs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | |
Arnd Bergmann | 821278a | 2006-10-02 02:18:41 -0700 | [diff] [blame] | 408 | memset(®s, 0, sizeof(regs)); |
| 409 | regs.regs[2] = (unsigned long)arg; |
| 410 | regs.regs[3] = (unsigned long)fn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | |
Arnd Bergmann | 821278a | 2006-10-02 02:18:41 -0700 | [diff] [blame] | 412 | regs.pc = (unsigned long)kernel_thread_helper; |
| 413 | regs.sr = (1 << 30); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | |
Arnd Bergmann | 821278a | 2006-10-02 02:18:41 -0700 | [diff] [blame] | 415 | return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, |
| 416 | ®s, 0, NULL, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | } |
| 418 | |
| 419 | /* |
| 420 | * Free current thread data structures etc.. |
| 421 | */ |
| 422 | void exit_thread(void) |
| 423 | { |
Paul Mundt | a23ba43 | 2007-11-28 20:19:38 +0900 | [diff] [blame^] | 424 | /* |
| 425 | * See arch/sparc/kernel/process.c for the precedent for doing |
| 426 | * this -- RPC. |
| 427 | * |
| 428 | * The SH-5 FPU save/restore approach relies on |
| 429 | * last_task_used_math pointing to a live task_struct. When |
| 430 | * another task tries to use the FPU for the 1st time, the FPUDIS |
| 431 | * trap handling (see arch/sh/kernel/cpu/sh5/fpu.c) will save the |
| 432 | * existing FPU state to the FP regs field within |
| 433 | * last_task_used_math before re-loading the new task's FPU state |
| 434 | * (or initialising it if the FPU has been used before). So if |
| 435 | * last_task_used_math is stale, and its page has already been |
| 436 | * re-allocated for another use, the consequences are rather |
| 437 | * grim. Unless we null it here, there is no other path through |
| 438 | * which it would get safely nulled. |
| 439 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | #ifdef CONFIG_SH_FPU |
| 441 | if (last_task_used_math == current) { |
| 442 | last_task_used_math = NULL; |
| 443 | } |
| 444 | #endif |
| 445 | } |
| 446 | |
| 447 | void flush_thread(void) |
| 448 | { |
| 449 | |
| 450 | /* Called by fs/exec.c (flush_old_exec) to remove traces of a |
| 451 | * previously running executable. */ |
| 452 | #ifdef CONFIG_SH_FPU |
| 453 | if (last_task_used_math == current) { |
| 454 | last_task_used_math = NULL; |
| 455 | } |
| 456 | /* Force FPU state to be reinitialised after exec */ |
| 457 | clear_used_math(); |
| 458 | #endif |
| 459 | |
| 460 | /* if we are a kernel thread, about to change to user thread, |
| 461 | * update kreg |
| 462 | */ |
| 463 | if(current->thread.kregs==&fake_swapper_regs) { |
| 464 | current->thread.kregs = |
| 465 | ((struct pt_regs *)(THREAD_SIZE + (unsigned long) current) - 1); |
| 466 | current->thread.uregs = current->thread.kregs; |
| 467 | } |
| 468 | } |
| 469 | |
| 470 | void release_thread(struct task_struct *dead_task) |
| 471 | { |
| 472 | /* do nothing */ |
| 473 | } |
| 474 | |
| 475 | /* Fill in the fpu structure for a core dump.. */ |
| 476 | int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu) |
| 477 | { |
| 478 | #ifdef CONFIG_SH_FPU |
| 479 | int fpvalid; |
| 480 | struct task_struct *tsk = current; |
| 481 | |
| 482 | fpvalid = !!tsk_used_math(tsk); |
| 483 | if (fpvalid) { |
| 484 | if (current == last_task_used_math) { |
Paul Mundt | 600ee24 | 2007-11-19 19:13:38 +0900 | [diff] [blame] | 485 | enable_fpu(); |
Paul Mundt | 332fd57 | 2007-11-22 17:30:50 +0900 | [diff] [blame] | 486 | save_fpu(tsk, regs); |
Paul Mundt | 600ee24 | 2007-11-19 19:13:38 +0900 | [diff] [blame] | 487 | disable_fpu(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | last_task_used_math = 0; |
| 489 | regs->sr |= SR_FD; |
| 490 | } |
| 491 | |
| 492 | memcpy(fpu, &tsk->thread.fpu.hard, sizeof(*fpu)); |
| 493 | } |
| 494 | |
| 495 | return fpvalid; |
| 496 | #else |
| 497 | return 0; /* Task didn't use the fpu at all. */ |
| 498 | #endif |
| 499 | } |
| 500 | |
| 501 | asmlinkage void ret_from_fork(void); |
| 502 | |
| 503 | int copy_thread(int nr, unsigned long clone_flags, unsigned long usp, |
| 504 | unsigned long unused, |
| 505 | struct task_struct *p, struct pt_regs *regs) |
| 506 | { |
| 507 | struct pt_regs *childregs; |
| 508 | unsigned long long se; /* Sign extension */ |
| 509 | |
| 510 | #ifdef CONFIG_SH_FPU |
| 511 | if(last_task_used_math == current) { |
Paul Mundt | 600ee24 | 2007-11-19 19:13:38 +0900 | [diff] [blame] | 512 | enable_fpu(); |
Paul Mundt | 332fd57 | 2007-11-22 17:30:50 +0900 | [diff] [blame] | 513 | save_fpu(current, regs); |
Paul Mundt | 600ee24 | 2007-11-19 19:13:38 +0900 | [diff] [blame] | 514 | disable_fpu(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | last_task_used_math = NULL; |
| 516 | regs->sr |= SR_FD; |
| 517 | } |
| 518 | #endif |
| 519 | /* Copy from sh version */ |
Al Viro | ee8c1dd | 2006-01-12 01:06:01 -0800 | [diff] [blame] | 520 | childregs = (struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | |
| 522 | *childregs = *regs; |
| 523 | |
| 524 | if (user_mode(regs)) { |
| 525 | childregs->regs[15] = usp; |
| 526 | p->thread.uregs = childregs; |
| 527 | } else { |
Al Viro | ee8c1dd | 2006-01-12 01:06:01 -0800 | [diff] [blame] | 528 | childregs->regs[15] = (unsigned long)task_stack_page(p) + THREAD_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | } |
| 530 | |
| 531 | childregs->regs[9] = 0; /* Set return value for child */ |
| 532 | childregs->sr |= SR_FD; /* Invalidate FPU flag */ |
| 533 | |
| 534 | p->thread.sp = (unsigned long) childregs; |
| 535 | p->thread.pc = (unsigned long) ret_from_fork; |
| 536 | |
| 537 | /* |
| 538 | * Sign extend the edited stack. |
| 539 | * Note that thread.pc and thread.pc will stay |
| 540 | * 32-bit wide and context switch must take care |
| 541 | * of NEFF sign extension. |
| 542 | */ |
| 543 | |
| 544 | se = childregs->regs[15]; |
| 545 | se = (se & NEFF_SIGN) ? (se | NEFF_MASK) : se; |
| 546 | childregs->regs[15] = se; |
| 547 | |
| 548 | return 0; |
| 549 | } |
| 550 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | asmlinkage int sys_fork(unsigned long r2, unsigned long r3, |
| 552 | unsigned long r4, unsigned long r5, |
| 553 | unsigned long r6, unsigned long r7, |
| 554 | struct pt_regs *pregs) |
| 555 | { |
| 556 | return do_fork(SIGCHLD, pregs->regs[15], pregs, 0, 0, 0); |
| 557 | } |
| 558 | |
| 559 | asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp, |
| 560 | unsigned long r4, unsigned long r5, |
| 561 | unsigned long r6, unsigned long r7, |
| 562 | struct pt_regs *pregs) |
| 563 | { |
| 564 | if (!newsp) |
| 565 | newsp = pregs->regs[15]; |
| 566 | return do_fork(clone_flags, newsp, pregs, 0, 0, 0); |
| 567 | } |
| 568 | |
| 569 | /* |
| 570 | * This is trivial, and on the face of it looks like it |
| 571 | * could equally well be done in user mode. |
| 572 | * |
| 573 | * Not so, for quite unobvious reasons - register pressure. |
| 574 | * In user mode vfork() cannot have a stack frame, and if |
| 575 | * done by calling the "clone()" system call directly, you |
| 576 | * do not have enough call-clobbered registers to hold all |
| 577 | * the information you need. |
| 578 | */ |
| 579 | asmlinkage int sys_vfork(unsigned long r2, unsigned long r3, |
| 580 | unsigned long r4, unsigned long r5, |
| 581 | unsigned long r6, unsigned long r7, |
| 582 | struct pt_regs *pregs) |
| 583 | { |
| 584 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, pregs->regs[15], pregs, 0, 0, 0); |
| 585 | } |
| 586 | |
| 587 | /* |
| 588 | * sys_execve() executes a new program. |
| 589 | */ |
| 590 | asmlinkage int sys_execve(char *ufilename, char **uargv, |
| 591 | char **uenvp, unsigned long r5, |
| 592 | unsigned long r6, unsigned long r7, |
| 593 | struct pt_regs *pregs) |
| 594 | { |
| 595 | int error; |
| 596 | char *filename; |
| 597 | |
| 598 | lock_kernel(); |
| 599 | filename = getname((char __user *)ufilename); |
| 600 | error = PTR_ERR(filename); |
| 601 | if (IS_ERR(filename)) |
| 602 | goto out; |
| 603 | |
| 604 | error = do_execve(filename, |
| 605 | (char __user * __user *)uargv, |
| 606 | (char __user * __user *)uenvp, |
| 607 | pregs); |
| 608 | if (error == 0) { |
| 609 | task_lock(current); |
| 610 | current->ptrace &= ~PT_DTRACE; |
| 611 | task_unlock(current); |
| 612 | } |
| 613 | putname(filename); |
| 614 | out: |
| 615 | unlock_kernel(); |
| 616 | return error; |
| 617 | } |
| 618 | |
| 619 | /* |
| 620 | * These bracket the sleeping functions.. |
| 621 | */ |
| 622 | extern void interruptible_sleep_on(wait_queue_head_t *q); |
| 623 | |
| 624 | #define mid_sched ((unsigned long) interruptible_sleep_on) |
| 625 | |
| 626 | static int in_sh64_switch_to(unsigned long pc) |
| 627 | { |
| 628 | extern char __sh64_switch_to_end; |
| 629 | /* For a sleeping task, the PC is somewhere in the middle of the function, |
| 630 | so we don't have to worry about masking the LSB off */ |
| 631 | return (pc >= (unsigned long) sh64_switch_to) && |
| 632 | (pc < (unsigned long) &__sh64_switch_to_end); |
| 633 | } |
| 634 | |
| 635 | unsigned long get_wchan(struct task_struct *p) |
| 636 | { |
| 637 | unsigned long schedule_fp; |
| 638 | unsigned long sh64_switch_to_fp; |
| 639 | unsigned long schedule_caller_pc; |
| 640 | unsigned long pc; |
| 641 | |
| 642 | if (!p || p == current || p->state == TASK_RUNNING) |
| 643 | return 0; |
| 644 | |
| 645 | /* |
| 646 | * The same comment as on the Alpha applies here, too ... |
| 647 | */ |
| 648 | pc = thread_saved_pc(p); |
| 649 | |
| 650 | #ifdef CONFIG_FRAME_POINTER |
| 651 | if (in_sh64_switch_to(pc)) { |
| 652 | sh64_switch_to_fp = (long) p->thread.sp; |
| 653 | /* r14 is saved at offset 4 in the sh64_switch_to frame */ |
| 654 | schedule_fp = *(unsigned long *) (long)(sh64_switch_to_fp + 4); |
| 655 | |
| 656 | /* and the caller of 'schedule' is (currently!) saved at offset 24 |
| 657 | in the frame of schedule (from disasm) */ |
| 658 | schedule_caller_pc = *(unsigned long *) (long)(schedule_fp + 24); |
| 659 | return schedule_caller_pc; |
| 660 | } |
| 661 | #endif |
| 662 | return pc; |
| 663 | } |
| 664 | |
| 665 | /* Provide a /proc/asids file that lists out the |
| 666 | ASIDs currently associated with the processes. (If the DM.PC register is |
| 667 | examined through the debug link, this shows ASID + PC. To make use of this, |
| 668 | the PID->ASID relationship needs to be known. This is primarily for |
| 669 | debugging.) |
| 670 | */ |
| 671 | |
| 672 | #if defined(CONFIG_SH64_PROC_ASIDS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | static int |
| 674 | asids_proc_info(char *buf, char **start, off_t fpos, int length, int *eof, void *data) |
| 675 | { |
| 676 | int len=0; |
| 677 | struct task_struct *p; |
| 678 | read_lock(&tasklist_lock); |
| 679 | for_each_process(p) { |
| 680 | int pid = p->pid; |
Paul Mundt | df0fb25 | 2007-11-21 17:07:46 +0900 | [diff] [blame] | 681 | |
| 682 | if (!pid) |
| 683 | continue; |
| 684 | if (p->mm) |
| 685 | len += sprintf(buf+len, "%5d : %02lx\n", pid, |
| 686 | asid_cache(smp_processor_id())); |
| 687 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | len += sprintf(buf+len, "%5d : (none)\n", pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | } |
| 690 | read_unlock(&tasklist_lock); |
| 691 | *eof = 1; |
| 692 | return len; |
| 693 | } |
| 694 | |
| 695 | static int __init register_proc_asids(void) |
| 696 | { |
Paul Mundt | c26056b | 2007-11-05 12:18:17 +0900 | [diff] [blame] | 697 | create_proc_read_entry("asids", 0, NULL, asids_proc_info, NULL); |
| 698 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | __initcall(register_proc_asids); |
| 701 | #endif |