src/afs/LINUX/osi_syscall.c

   1 /*
   2  * Copyright 2000, International Business Machines Corporation and others.
   3  * All Rights Reserved.
   4  *
   5  * This software has been released under the terms of the IBM Public
   6  * License.  For details, see the LICENSE file in the top-level source
   7  * directory or online at http://www.openafs.org/dl/license10.html
   8  */
   9
  10 /*
  11  * Linux module support routines.
  12  *
  13  */
  14 #include <afsconfig.h>
  15 #include "afs/param.h"
  16
  17 RCSID
  18     ("$Header$");
  19
  20 #ifdef AFS_LINUX24_ENV
  21 #include <linux/module.h> /* early to avoid printf->printk mapping */
  22 #endif
  23 #include "afs/sysincludes.h"
  24 #include "afsincludes.h"
  25 #include "h/unistd.h"           /* For syscall numbers. */
  26 #include "h/mm.h"
  27
  28 #ifdef AFS_AMD64_LINUX20_ENV
  29 #include <asm/ia32_unistd.h>
  30 #endif
  31
  32 #include <linux/proc_fs.h>
  33 #include <linux/slab.h>
  34 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
  35 #include <linux/init.h>
  36 #include <linux/sched.h>
  37 #endif
  38
  39 #ifndef NR_syscalls
  40 #define NR_syscalls 222
  41 #endif
  42
  43 /* On SPARC64 and S390X, sys_call_table contains 32-bit entries
  44  * even though pointers are 64 bit quantities.
  45  * XXX unify this with osi_probe.c
  46  */
  47 #if defined(AFS_SPARC64_LINUX20_ENV) || defined(AFS_S390X_LINUX24_ENV)
  48 #define SYSCALLTYPE unsigned int
  49 #define POINTER2SYSCALL (unsigned int)(unsigned long)
  50 #define SYSCALL2POINTER (void *)(long)
  51 #else
  52 #define SYSCALLTYPE void *
  53 #define POINTER2SYSCALL (void *)
  54 #define SYSCALL2POINTER (void *)
  55 #endif
  56
  57 #if defined(AFS_S390X_LINUX24_ENV)
  58 #define INSERT_SYSCALL(SLOT, TMPPAGE, FUNC) \
  59         if (SYSCALL2POINTER FUNC > 0x7fffffff) { \
  60             TMPPAGE = kmalloc ( PAGE_SIZE, GFP_DMA|GFP_KERNEL );        \
  61             if (SYSCALL2POINTER TMPPAGE > 0x7fffffff) { \
  62                 printf("Cannot allocate page for FUNC syscall jump vector\n"); \
  63                 return EINVAL; \
  64             } \
  65             memcpy(TMPPAGE, syscall_jump_code, sizeof(syscall_jump_code)); \
  66             *(void **)(TMPPAGE + 0x0c) = &FUNC; \
  67             afs_sys_call_table[_S(SLOT)] = POINTER2SYSCALL TMPPAGE; \
  68         } else \
  69             afs_sys_call_table[_S(SLOT)] = POINTER2SYSCALL FUNC;
  70 #else
  71 #define INSERT_SYSCALL(SLOT, TMPPAGE, FUNC) \
  72     afs_sys_call_table[_S(SLOT)] = POINTER2SYSCALL FUNC;
  73 #endif
  74
  75 #if defined(AFS_S390X_LINUX24_ENV) && !defined(AFS_LINUX26_ENV)
  76 #define _S(x) ((x)<<1)
  77 #elif defined(AFS_IA64_LINUX20_ENV)
  78 #define _S(x) ((x)-1024)
  79 #else
  80 #define _S(x) x
  81 #endif
  82
  83
  84 /***** ALL PLATFORMS *****/
  85 extern asmlinkage long
  86 afs_syscall(long syscall, long parm1, long parm2, long parm3, long parm4);
  87
  88 static SYSCALLTYPE *afs_sys_call_table;
  89 static SYSCALLTYPE afs_ni_syscall = 0;
  90
  91 #ifdef AFS_S390X_LINUX24_ENV
  92 static void *afs_sys_setgroups_page = 0;
  93 static void *afs_sys_setgroups32_page = 0;
  94 static void *afs_syscall_page = 0;
  95
  96 /* Because of how the syscall table is handled, we need to ensure our
  97    syscalls are within the first 2gb of address space. This means we need
  98    self-modifying code we can inject to call our handlers if the module
  99    is loaded high. If keyrings had advanced as fast as false protection
 100    this would be unnecessary. */
 101
 102 uint32_t syscall_jump_code[] = {
 103   0xe3d0f030, 0x00240dd0, 0xa7f40006, 0xffffffff, 0xffffffff, 0xe310d004,
 104   0x0004e3d0, 0xf0300004, 0x07f10000,
 105 };
 106 #endif
 107
 108 extern long afs_xsetgroups();
 109 asmlinkage long (*sys_setgroupsp) (int gidsetsize, gid_t * grouplist);
 110
 111 #ifdef AFS_LINUX24_ENV
 112 extern int afs_xsetgroups32();
 113 asmlinkage int (*sys_setgroups32p) (int gidsetsize,
 114                                     __kernel_gid32_t * grouplist);
 115 #endif
 116
 117 #if !defined(AFS_LINUX24_ENV)
 118 asmlinkage int (*sys_settimeofdayp) (struct timeval * tv, struct timezone * tz);
 119 #endif
 120
 121
 122 /***** AMD64 *****/
 123 #ifdef AFS_AMD64_LINUX20_ENV
 124 static SYSCALLTYPE *afs_ia32_sys_call_table;
 125 static SYSCALLTYPE ia32_ni_syscall = 0;
 126
 127 extern int afs32_xsetgroups();
 128 asmlinkage long (*sys32_setgroupsp) (int gidsetsize, u16 * grouplist);
 129 #ifdef AFS_LINUX24_ENV
 130 extern int afs32_xsetgroups32();
 131 asmlinkage long (*sys32_setgroups32p) (int gidsetsize, gid_t * grouplist);
 132 #endif /* __NR_ia32_setgroups32 */
 133 #endif /* AFS_AMD64_LINUX20_ENV */
 134
 135
 136 /***** PPC64 *****/
 137 #ifdef AFS_PPC64_LINUX26_ENV
 138 static SYSCALLTYPE *afs_sys_call_table32;
 139 static SYSCALLTYPE afs_ni_syscall32 = 0;
 140 static SYSCALLTYPE old_sys_setgroupsp = 0;
 141 static SYSCALLTYPE old_sys32_setgroupsp = 0;
 142
 143 extern int afs32_xsetgroups();
 144 asmlinkage long (*sys32_setgroupsp)(int gidsetsize, gid_t *grouplist);
 145
 146 asmlinkage long sys_close(unsigned int fd);
 147 static void sys_setgroups_stub()
 148         __attribute__ ((pure,const,no_instrument_function));
 149 static void sys_setgroups_stub()
 150 {
 151         printf("*** error! sys_setgroups_stub called\n");
 152 }
 153
 154 static void sys32_setgroups_stub()
 155         __attribute__ ((pure,const,no_instrument_function));
 156 static void sys32_setgroups_stub()
 157 {
 158         printf("*** error! sys32_setgroups_stub called\n");
 159 }
 160
 161 #endif /* AFS_AMD64_LINUX20_ENV */
 162
 163
 164 /***** SPARC64 *****/
 165 #ifdef AFS_SPARC64_LINUX20_ENV
 166 #ifdef AFS_SPARC64_LINUX26_ENV
 167 static SYSCALLTYPE *afs_sys_call_table32;
 168 #else
 169 extern SYSCALLTYPE *afs_sys_call_table32;
 170 #endif
 171 static SYSCALLTYPE afs_ni_syscall32 = 0;
 172
 173 extern int afs32_xsetgroups();
 174 #ifdef AFS_SPARC64_LINUX26_ENV
 175 asmlinkage int (*sys32_setgroupsp) (int gidsetsize,
 176                                     __kernel_gid32_t * grouplist);
 177 #else
 178 asmlinkage int (*sys32_setgroupsp) (int gidsetsize,
 179                                     __kernel_gid_t32 * grouplist);
 180 #endif
 181 #ifdef AFS_LINUX24_ENV
 182 /* This number is not exported for some bizarre reason. */
 183 #define __NR_setgroups32      82
 184 extern int afs32_xsetgroups32();
 185 #ifdef AFS_SPARC64_LINUX26_ENV
 186 asmlinkage int (*sys32_setgroups32p) (int gidsetsize,
 187                                       __kernel_gid32_t * grouplist);
 188 #else
 189 asmlinkage int (*sys32_setgroups32p) (int gidsetsize,
 190                                       __kernel_gid_t32 * grouplist);
 191 #endif
 192 #endif
 193
 194 asmlinkage int
 195 afs_syscall32(long syscall, long parm1, long parm2, long parm3, long parm4,
 196               long parm5)
 197 {
 198     __asm__ __volatile__("srl %o4, 0, %o4\n\t"
 199                          "mov %o7, %i7\n\t"
 200                          "call afs_syscall\n\t"
 201                          "srl %o5, 0, %o5\n\t"
 202                          "ret\n\t"
 203                          "nop");
 204 }
 205 #endif /* AFS_SPARC64_LINUX20_ENV */
 206
 207
 208 /***** IA64 *****/
 209 #ifdef AFS_IA64_LINUX20_ENV
 210
 211 asmlinkage long
 212 afs_syscall_stub(int r0, int r1, long r2, long r3, long r4, long gp)
 213 {
 214     __asm__ __volatile__("alloc r42 = ar.pfs, 8, 3, 6, 0\n\t"
 215                          "mov r41 = b0\n\t"     /* save rp */
 216                          "mov out0 = in0\n\t"
 217                          "mov out1 = in1\n\t"
 218                          "mov out2 = in2\n\t"
 219                          "mov out3 = in3\n\t"
 220                          "mov out4 = in4\n\t"
 221                          "mov out5 = gp\n\t"    /* save gp */
 222                          ";;\n"
 223                          ".L1:\n\t"
 224                          "mov r3 = ip\n\t"
 225                          ";;\n\t"
 226                          "addl r15=.fptr_afs_syscall-.L1,r3\n\t"
 227                          ";;\n\t"
 228                          "ld8 r15=[r15]\n\t"
 229                          ";;\n\t"
 230                          "ld8 r16=[r15],8\n\t"
 231                          ";;\n\t"
 232                          "ld8 gp=[r15]\n\t"
 233                          "mov b6=r16\n\t"
 234                          "br.call.sptk.many b0 = b6\n\t"
 235                          ";;\n\t"
 236                          "mov ar.pfs = r42\n\t"
 237                          "mov b0 = r41\n\t"
 238                          "mov gp = r48\n\t"     /* restore gp */
 239                          "br.ret.sptk.many b0\n"
 240                          ".fptr_afs_syscall:\n\t"
 241                          "data8 @fptr(afs_syscall)\n\t"
 242                          ".skip 8");
 243 }
 244
 245 asmlinkage long
 246 afs_xsetgroups_stub(int r0, int r1, long r2, long r3, long r4, long gp)
 247 {
 248     __asm__ __volatile__("alloc r42 = ar.pfs, 8, 3, 6, 0\n\t"
 249                          "mov r41 = b0\n\t"     /* save rp */
 250                          "mov out0 = in0\n\t"
 251                          "mov out1 = in1\n\t"
 252                          "mov out2 = in2\n\t"
 253                          "mov out3 = in3\n\t"
 254                          "mov out4 = in4\n\t"
 255                          "mov out5 = gp\n\t"    /* save gp */
 256                          ";;\n"
 257                          ".L2:\n\t"
 258                          "mov r3 = ip\n\t"
 259                          ";;\n\t"
 260                          "addl r15=.fptr_afs_xsetgroups - .L2,r3\n\t"
 261                          ";;\n\t"
 262                          "ld8 r15=[r15]\n\t"
 263                          ";;\n\t"
 264                          "ld8 r16=[r15],8\n\t"
 265                          ";;\n\t"
 266                          "ld8 gp=[r15]\n\t"
 267                          "mov b6=r16\n\t"
 268                          "br.call.sptk.many b0 = b6\n\t"
 269                          ";;\n\t"
 270                          "mov ar.pfs = r42\n\t"
 271                          "mov b0 = r41\n\t"
 272                          "mov gp = r48\n\t"     /* restore gp */
 273                          "br.ret.sptk.many b0\n"
 274                          ".fptr_afs_xsetgroups:\n\t"
 275                          "data8 @fptr(afs_xsetgroups)\n\t"
 276                          ".skip 8");
 277 }
 278
 279 struct fptr {
 280     void *ip;
 281     unsigned long gp;
 282 };
 283
 284 #endif /* AFS_IA64_LINUX20_ENV */
 285
 286 /***** PPC64 *****
 287  * Spring 2005
 288  * sys_call_table hook for PPC64
 289  * by Soewono Effendi <Soewono.Effendi@sysgo.de>
 290  * for IBM Deutschland
 291  * Thanks go to SYSGO's team for their support:
 292  * Horst Birthelmer <Horst.Birthelmer@sysgo.de>
 293  * Marius Groeger <Marius.Groeger@sysgo.de>
 294  */
 295 #if defined(AFS_PPC64_LINUX26_ENV)
 296 extern void flush_cache(void *, unsigned long);
 297 #define PPC_LO(v) ((v) & 0xffff)
 298 #define PPC_HI(v) (((v) >> 16) & 0xffff)
 299 #define PPC_HA(v) PPC_HI ((v) + 0x8000)
 300 #define PPC_HLO(v) ((short)(((v) >> 32) & 0xffff))
 301 #define PPC_HHI(v) ((short)(((v) >> 48) & 0xffff))
 302
 303 struct ppc64_opd
 304 {
 305         unsigned long funcaddr;
 306         unsigned long r2;
 307 };
 308
 309 struct ppc64_stub
 310 {
 311         unsigned char jump[136];
 312         unsigned long r2;
 313         unsigned long lr;
 314         struct ppc64_opd opd;
 315 } __attribute__ ((packed));
 316
 317 /* a stub to fix up r2 (TOC ptr) and to jump to our sys_call hook
 318    function.  We patch the new r2 value and function pointer into
 319    the stub. */
 320 #define PPC64_STUB(stub) \
 321 static struct ppc64_stub stub = \
 322 { .jump = { \
 323         0xf8, 0x41, 0x00, 0x28, /*     std     r2,40(r1) */ \
 324         0xfb, 0xc1, 0xff, 0xf0, /*     std     r30,-16(r1) */ \
 325         0xfb, 0xa1, 0xff, 0xe8, /*     std     r29,-24(r1) */ \
 326         0x7c, 0x5d, 0x13, 0x78, /*     mr      r29,r2 */ \
 327         0x3c, 0x40, 0x12, 0x34, /*16:  lis     r2,4660 */ \
 328         0x60, 0x42, 0x56, 0x78, /*20:  ori     r2,r2,22136 */ \
 329         0x78, 0x42, 0x07, 0xc6, /*     rldicr  r2,r2,32,31 */ \
 330         0x64, 0x42, 0x90, 0xab, /*28:  oris    r2,r2,37035 */ \
 331         0x60, 0x42, 0xcd, 0xef, /*32:  ori     r2,r2,52719 */ \
 332         0x3f, 0xc2, 0x00, 0x00, /*36:  addis   r30,r2,0 */ \
 333         0x3b, 0xde, 0x00, 0x00, /*40:  addi    r30,r30,0 */ \
 334         0xfb, 0xbe, 0x00, 0x88, /*     std     r29,136(r30) */ \
 335         0x7f, 0xa8, 0x02, 0xa6, /*     mflr    r29 */ \
 336         0xfb, 0xbe, 0x00, 0x90, /*     std     r29,144(r30) */ \
 337         0xeb, 0xde, 0x00, 0x98, /*     ld      r30,152(r30) */ \
 338         0x7f, 0xc8, 0x03, 0xa6, /*     mtlr    r30 */ \
 339         0xeb, 0xa1, 0xff, 0xe8, /*     ld      r29,-24(r1) */ \
 340         0xeb, 0xc1, 0xff, 0xf0, /*     ld      r30,-16(r1) */ \
 341         0x4e, 0x80, 0x00, 0x21, /*     blrl */ \
 342         0x3c, 0x40, 0x12, 0x34, /*76:  lis     r2,4660 */ \
 343         0x60, 0x42, 0x56, 0x78, /*80:  ori     r2,r2,22136 */ \
 344         0x78, 0x42, 0x07, 0xc6, /*     rldicr  r2,r2,32,31 */ \
 345         0x64, 0x42, 0x90, 0xab, /*88:  oris    r2,r2,37035 */ \
 346         0x60, 0x42, 0xcd, 0xef, /*92:  ori     r2,r2,52719 */ \
 347         0xfb, 0xc1, 0xff, 0xf0, /*     std     r30,-16(r1) */ \
 348         0xfb, 0xa1, 0xff, 0xe8, /*     std     r29,-24(r1) */ \
 349         0x3f, 0xc2, 0xab, 0xcd, /*104: addis   r30,r2,-21555 */ \
 350         0x3b, 0xde, 0x78, 0x90, /*108: addi    r30,r30,30864 */ \
 351         0xeb, 0xbe, 0x00, 0x90, /*     ld      r29,144(r30) */ \
 352         0x7f, 0xa8, 0x03, 0xa6, /*     mtlr    r29 */ \
 353         0xe8, 0x5e, 0x00, 0x88, /*     ld      r2,136(r30) */ \
 354         0xeb, 0xa1, 0xff, 0xe8, /*     ld      r29,-24(r1) */ \
 355         0xeb, 0xc1, 0xff, 0xf0, /*     ld      r30,-16(r1) */ \
 356         0x4e, 0x80, 0x00, 0x20  /*     blr */ \
 357 }}
 358
 359 static void * create_stub(struct ppc64_stub *stub,
 360                           struct ppc64_opd *opd)
 361 {
 362         unsigned short *p1, *p2, *p3, *p4;
 363         unsigned long addr;
 364
 365         stub->opd.funcaddr = opd->funcaddr;
 366         stub->opd.r2 = opd->r2;
 367         addr = (unsigned long) opd->r2;
 368         p1 = (unsigned short*) &stub->jump[18];
 369         p2 = (unsigned short*) &stub->jump[22];
 370         p3 = (unsigned short*) &stub->jump[30];
 371         p4 = (unsigned short*) &stub->jump[34];
 372
 373         *p1 = PPC_HHI(addr);
 374         *p2 = PPC_HLO(addr);
 375         *p3 = PPC_HI(addr);
 376         *p4 = PPC_LO(addr);
 377
 378         addr = (unsigned long) stub - opd->r2;
 379         p1 = (unsigned short*) &stub->jump[38];
 380         p2 = (unsigned short*) &stub->jump[42];
 381         *p1 = PPC_HA(addr);
 382         *p2 = PPC_LO(addr);
 383         p1 = (unsigned short*) &stub->jump[106];
 384         p2 = (unsigned short*) &stub->jump[110];
 385         *p1 = PPC_HA(addr);
 386         *p2 = PPC_LO(addr);
 387
 388         addr = (unsigned long) opd->r2;
 389         p1 = (unsigned short*) &stub->jump[78];
 390         p2 = (unsigned short*) &stub->jump[82];
 391         p3 = (unsigned short*) &stub->jump[90];
 392         p4 = (unsigned short*) &stub->jump[94];
 393
 394         *p1 = PPC_HHI(addr);
 395         *p2 = PPC_HLO(addr);
 396         *p3 = PPC_HI(addr);
 397         *p4 = PPC_LO(addr);
 398
 399         flush_cache((void *)stub, sizeof(*stub));
 400         return ((void*)(stub));
 401 }
 402
 403 PPC64_STUB(afs_sys_call_stub);
 404 PPC64_STUB(afs_xsetgroups_stub);
 405 PPC64_STUB(afs_xsetgroups32_stub);
 406 #endif /* AFS_PPC64_LINUX26_ENV */
 407
 408
 409 /**********************************************************************/
 410 /********************* System Call Initialization *********************/
 411 /**********************************************************************/
 412
 413 int osi_syscall_init(void)
 414 {
 415 /***** IA64 *****/
 416 #ifdef AFS_IA64_LINUX20_ENV
 417     /* This needs to be first because we are declaring variables, and
 418      * also because the handling of syscall pointers is bizarre enough
 419      * that we want to special-case even the "common" part.
 420      */
 421     unsigned long kernel_gp = 0;
 422     static struct fptr sys_setgroups;
 423
 424     afs_sys_call_table = osi_find_syscall_table(0);
 425     if (afs_sys_call_table) {
 426
 427 #if !defined(AFS_LINUX24_ENV)
 428         /* XXX no sys_settimeofday on IA64? */
 429 #endif
 430
 431         /* check we aren't already loaded */
 432         /* XXX this can't be right */
 433         if (SYSCALL2POINTER afs_sys_call_table[_S(__NR_afs_syscall)]
 434             == afs_syscall) {
 435             printf("AFS syscall entry point already in use!\n");
 436             return -EBUSY;
 437         }
 438
 439         /* setup AFS entry point */
 440         afs_ni_syscall = afs_sys_call_table[_S(__NR_afs_syscall)];
 441         afs_sys_call_table[_S(__NR_afs_syscall)] =
 442                 POINTER2SYSCALL((struct fptr *)afs_syscall_stub)->ip;
 443
 444         /* setup setgroups */
 445         sys_setgroupsp = (void *)&sys_setgroups;
 446
 447         ((struct fptr *)sys_setgroupsp)->ip =
 448             SYSCALL2POINTER afs_sys_call_table[_S(__NR_setgroups)];
 449         ((struct fptr *)sys_setgroupsp)->gp = kernel_gp;
 450
 451         afs_sys_call_table[_S(__NR_setgroups)] =
 452             POINTER2SYSCALL((struct fptr *)afs_xsetgroups_stub)->ip;
 453     }
 454
 455     /* XXX no 32-bit syscalls on IA64? */
 456
 457
 458 #elif defined(AFS_PPC64_LINUX26_ENV)
 459
 460     afs_sys_call_table = osi_find_syscall_table(0);
 461     if (afs_sys_call_table) {
 462         SYSCALLTYPE p;
 463         struct ppc64_opd* opd = (struct ppc64_opd*) sys_close;
 464         unsigned long r2 = opd->r2;
 465         opd = (struct ppc64_opd*) afs_syscall;
 466         afs_sys_call_table32 = (unsigned long)afs_sys_call_table -
 467                 NR_syscalls * sizeof(SYSCALLTYPE);
 468         /* check we aren't already loaded */
 469         p = SYSCALL2POINTER afs_sys_call_table[_S(__NR_afs_syscall)];
 470         if ((unsigned long)p == opd->funcaddr) {
 471             printf("AFS syscall entry point already in use!\n");
 472             return -EBUSY;
 473         }
 474         /* setup AFS entry point */
 475         p = create_stub(&afs_sys_call_stub, opd);
 476         afs_ni_syscall = afs_sys_call_table[_S(__NR_afs_syscall)];
 477         afs_sys_call_table[_S(__NR_afs_syscall)] = POINTER2SYSCALL p;
 478
 479         /* setup setgroups */
 480         opd = (struct ppc64_opd*) afs_xsetgroups;
 481         p = create_stub(&afs_xsetgroups_stub, opd);
 482         old_sys_setgroupsp = SYSCALL2POINTER afs_sys_call_table[_S(__NR_setgroups)];
 483         afs_sys_call_table[_S(__NR_setgroups)] = POINTER2SYSCALL p;
 484         opd = (struct ppc64_opd*) sys_setgroups_stub;
 485         opd->funcaddr = old_sys_setgroupsp;
 486         opd->r2 = r2;
 487
 488         /* setup setgroups32 */
 489         opd = (struct ppc64_opd*) afs32_xsetgroups;
 490         p = create_stub(&afs_xsetgroups32_stub, opd);
 491         old_sys32_setgroupsp = SYSCALL2POINTER afs_sys_call_table32[_S(__NR_setgroups)];
 492         afs_sys_call_table32[_S(__NR_setgroups)] = POINTER2SYSCALL p;
 493         opd = (struct ppc64_opd*) sys32_setgroups_stub;
 494         opd->funcaddr = old_sys32_setgroupsp;
 495         opd->r2 = r2;
 496
 497         flush_cache((void *)afs_sys_call_table, 2*NR_syscalls*sizeof(void*));
 498
 499         sys_setgroupsp = sys_setgroups_stub;
 500         sys32_setgroupsp = sys32_setgroups_stub;
 501     }
 502 /***** COMMON (except IA64 or PPC64) *****/
 503 #else /* !AFS_IA64_LINUX20_ENV */
 504
 505     afs_sys_call_table = osi_find_syscall_table(0);
 506     if (afs_sys_call_table) {
 507 #if !defined(AFS_LINUX24_ENV)
 508         sys_settimeofdayp =
 509             SYSCALL2POINTER afs_sys_call_table[_S(__NR_settimeofday)];
 510 #endif /* AFS_LINUX24_ENV */
 511
 512         /* check we aren't already loaded */
 513         if (SYSCALL2POINTER afs_sys_call_table[_S(__NR_afs_syscall)]
 514             == afs_syscall) {
 515             printf("AFS syscall entry point already in use!\n");
 516             return -EBUSY;
 517         }
 518
 519         /* setup AFS entry point */
 520         afs_ni_syscall = afs_sys_call_table[_S(__NR_afs_syscall)];
 521
 522         INSERT_SYSCALL(__NR_afs_syscall, afs_syscall_page, afs_syscall)
 523
 524         /* setup setgroups */
 525         sys_setgroupsp = SYSCALL2POINTER afs_sys_call_table[_S(__NR_setgroups)];
 526         INSERT_SYSCALL(__NR_setgroups, afs_sys_setgroups_page, afs_xsetgroups)
 527
 528 #if defined(__NR_setgroups32)
 529         /* setup setgroups32 */
 530         sys_setgroups32p = SYSCALL2POINTER afs_sys_call_table[__NR_setgroups32];
 531         INSERT_SYSCALL(__NR_setgroups32, afs_sys_setgroups32_page, afs_xsetgroups32)
 532 #endif
 533     }
 534 #endif /* !AFS_IA64_LINUX20_ENV */
 535
 536
 537 /***** AMD64 *****/
 538 #ifdef AFS_AMD64_LINUX20_ENV
 539     afs_ia32_sys_call_table = osi_find_syscall_table(1);
 540     if (afs_ia32_sys_call_table) {
 541         /* setup AFS entry point for IA32 */
 542         ia32_ni_syscall = afs_ia32_sys_call_table[__NR_ia32_afs_syscall];
 543         afs_ia32_sys_call_table[__NR_ia32_afs_syscall] =
 544             POINTER2SYSCALL afs_syscall;
 545
 546         /* setup setgroups for IA32 */
 547         sys32_setgroupsp =
 548             SYSCALL2POINTER afs_ia32_sys_call_table[__NR_ia32_setgroups];
 549         afs_ia32_sys_call_table[__NR_ia32_setgroups] =
 550             POINTER2SYSCALL afs32_xsetgroups;
 551
 552 #if AFS_LINUX24_ENV
 553         /* setup setgroups32 for IA32 */
 554         sys32_setgroups32p =
 555             SYSCALL2POINTER afs_ia32_sys_call_table[__NR_ia32_setgroups32];
 556         afs_ia32_sys_call_table[__NR_ia32_setgroups32] =
 557             POINTER2SYSCALL afs32_xsetgroups32;
 558 #endif /* __NR_ia32_setgroups32 */
 559     }
 560 #endif /* AFS_AMD64_LINUX20_ENV */
 561
 562
 563 /***** SPARC64 *****/
 564 #ifdef AFS_SPARC64_LINUX20_ENV
 565     afs_sys_call_table32 = osi_find_syscall_table(1);
 566     if (afs_sys_call_table32) {
 567         /* setup AFS entry point for 32-bit SPARC */
 568         afs_ni_syscall32 = afs_sys_call_table32[__NR_afs_syscall];
 569         afs_sys_call_table32[__NR_afs_syscall] = POINTER2SYSCALL afs_syscall32;
 570
 571         /* setup setgroups for 32-bit SPARC */
 572         sys32_setgroupsp = SYSCALL2POINTER afs_sys_call_table32[__NR_setgroups];
 573         afs_sys_call_table32[__NR_setgroups] = POINTER2SYSCALL afs32_xsetgroups;
 574
 575 #ifdef AFS_LINUX24_ENV
 576         /* setup setgroups32 for 32-bit SPARC */
 577         sys32_setgroups32p =
 578             SYSCALL2POINTER afs_sys_call_table32[__NR_setgroups32];
 579         afs_sys_call_table32[__NR_setgroups32] =
 580             POINTER2SYSCALL afs32_xsetgroups32;
 581 #endif
 582     }
 583 #endif /* AFS_SPARC64_LINUX20_ENV */
 584     return 0;
 585 }
 586
 587
 588
 589 /**********************************************************************/
 590 /************************ System Call Cleanup *************************/
 591 /**********************************************************************/
 592
 593 void osi_syscall_clean(void)
 594 {
 595 /***** COMMON *****/
 596     if (afs_sys_call_table) {
 597         /* put back the AFS entry point */
 598         afs_sys_call_table[_S(__NR_afs_syscall)] = afs_ni_syscall;
 599
 600         /* put back setgroups */
 601 #if defined(AFS_IA64_LINUX20_ENV)
 602         afs_sys_call_table[_S(__NR_setgroups)] =
 603             POINTER2SYSCALL((struct fptr *)sys_setgroupsp)->ip;
 604 #elif defined(AFS_PPC64_LINUX26_ENV)
 605         afs_sys_call_table[_S(__NR_setgroups)] =
 606             POINTER2SYSCALL old_sys_setgroupsp;
 607         /* put back setgroups32 for PPC64 */
 608         afs_sys_call_table32[__NR_setgroups] =
 609             POINTER2SYSCALL old_sys32_setgroupsp;
 610 #else /* AFS_IA64_LINUX20_ENV */
 611         afs_sys_call_table[_S(__NR_setgroups)] =
 612             POINTER2SYSCALL sys_setgroupsp;
 613 #endif
 614
 615 #if defined(__NR_setgroups32) && !defined(AFS_IA64_LINUX20_ENV)
 616         /* put back setgroups32 */
 617         afs_sys_call_table[__NR_setgroups32] = POINTER2SYSCALL sys_setgroups32p;
 618 #endif
 619 #if defined(AFS_S390X_LINUX24_ENV)
 620 #if defined(__NR_setgroups32) && !defined(AFS_IA64_LINUX20_ENV)
 621         if (afs_sys_setgroups32_page)
 622             kfree(afs_sys_setgroups32_page);
 623 #endif
 624         if (afs_sys_setgroups_page)
 625             kfree(afs_sys_setgroups_page);
 626         if (afs_syscall_page)
 627             kfree(afs_syscall_page);
 628 #endif
 629     }
 630
 631
 632 /***** IA64 *****/
 633 #ifdef AFS_IA64_LINUX20_ENV
 634     /* XXX no 32-bit syscalls on IA64? */
 635 #endif
 636
 637
 638 /***** AMD64 *****/
 639 #ifdef AFS_AMD64_LINUX20_ENV
 640     if (afs_ia32_sys_call_table) {
 641         /* put back AFS entry point for IA32 */
 642         afs_ia32_sys_call_table[__NR_ia32_afs_syscall] =
 643             POINTER2SYSCALL ia32_ni_syscall;
 644
 645         /* put back setgroups for IA32 */
 646         afs_ia32_sys_call_table[__NR_ia32_setgroups] =
 647             POINTER2SYSCALL sys32_setgroupsp;
 648
 649 #ifdef AFS_LINUX24_ENV
 650         /* put back setgroups32 for IA32 */
 651         afs_ia32_sys_call_table[__NR_ia32_setgroups32] =
 652             POINTER2SYSCALL sys32_setgroups32p;
 653 #endif
 654     }
 655 #endif
 656
 657
 658 /***** SPARC64 *****/
 659 #ifdef AFS_SPARC64_LINUX20_ENV
 660     if (afs_sys_call_table32) {
 661         /* put back AFS entry point for 32-bit SPARC */
 662         afs_sys_call_table32[__NR_afs_syscall] = afs_ni_syscall32;
 663
 664         /* put back setgroups for IA32 */
 665         afs_sys_call_table32[__NR_setgroups] =
 666             POINTER2SYSCALL sys32_setgroupsp;
 667
 668 #ifdef AFS_LINUX24_ENV
 669         /* put back setgroups32 for IA32 */
 670         afs_sys_call_table32[__NR_setgroups32] =
 671             POINTER2SYSCALL sys32_setgroups32p;
 672 #endif
 673     }
 674 #endif
 675 }