Remove pre-Linux 2.6 support
[openafs.git] / 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
18 #include <linux/module.h> /* early to avoid printf->printk mapping */
19 #include "afs/sysincludes.h"
20 #include "afsincludes.h"
21 #include "h/unistd.h"           /* For syscall numbers. */
22 #include "h/mm.h"
23
24 #ifdef AFS_AMD64_LINUX20_ENV
25 #include <asm/ia32_unistd.h>
26 #endif
27
28 #include <linux/proc_fs.h>
29 #include <linux/slab.h>
30 #include <linux/init.h>
31 #include <linux/sched.h>
32
33 #ifndef NR_syscalls
34 #define NR_syscalls 222
35 #endif
36
37 /* On SPARC64 and S390X, sys_call_table contains 32-bit entries
38  * even though pointers are 64 bit quantities.
39  * XXX unify this with osi_probe.c
40  */
41 #if defined(AFS_SPARC64_LINUX20_ENV) || defined(AFS_S390X_LINUX24_ENV)
42 #define SYSCALLTYPE unsigned int
43 #define POINTER2SYSCALL (unsigned int)(unsigned long)
44 #define SYSCALL2POINTER (void *)(long)
45 #else
46 #define SYSCALLTYPE void *
47 #define POINTER2SYSCALL (void *)
48 #define SYSCALL2POINTER (void *)
49 #endif
50
51 #if defined(AFS_S390X_LINUX24_ENV) 
52 #define INSERT_SYSCALL(SLOT, TMPPAGE, FUNC) \
53         if (SYSCALL2POINTER FUNC > 0x7fffffff) { \
54             TMPPAGE = kmalloc ( PAGE_SIZE, GFP_DMA|GFP_KERNEL );        \
55             if (SYSCALL2POINTER TMPPAGE > 0x7fffffff) { \
56                 printf("Cannot allocate page for FUNC syscall jump vector\n"); \
57                 return EINVAL; \
58             } \
59             memcpy(TMPPAGE, syscall_jump_code, sizeof(syscall_jump_code)); \
60             *(void **)(TMPPAGE + 0x0c) = &FUNC; \
61             afs_sys_call_table[_S(SLOT)] = POINTER2SYSCALL TMPPAGE; \
62         } else \
63             afs_sys_call_table[_S(SLOT)] = POINTER2SYSCALL FUNC;
64 #else
65 #define INSERT_SYSCALL(SLOT, TMPPAGE, FUNC) \
66     afs_sys_call_table[_S(SLOT)] = POINTER2SYSCALL FUNC;
67 #endif 
68
69 #if defined(AFS_IA64_LINUX20_ENV)
70 #define _S(x) ((x)-1024)
71 #else
72 #define _S(x) x
73 #endif
74
75
76 /***** ALL PLATFORMS *****/
77 extern asmlinkage long
78 afs_syscall(long syscall, long parm1, long parm2, long parm3, long parm4);
79
80 static SYSCALLTYPE *afs_sys_call_table;
81 static SYSCALLTYPE afs_ni_syscall = 0;
82
83 #ifdef AFS_S390X_LINUX24_ENV
84 static void *afs_sys_setgroups_page = 0;
85 static void *afs_sys_setgroups32_page = 0;
86 static void *afs_syscall_page = 0;
87
88 /* Because of how the syscall table is handled, we need to ensure our 
89    syscalls are within the first 2gb of address space. This means we need
90    self-modifying code we can inject to call our handlers if the module 
91    is loaded high. If keyrings had advanced as fast as false protection
92    this would be unnecessary. */
93
94 uint32_t syscall_jump_code[] = {
95   0xe3d0f030, 0x00240dd0, 0xa7f40006, 0xffffffff, 0xffffffff, 0xe310d004, 
96   0x0004e3d0, 0xf0300004, 0x07f10000, 
97 };
98 #endif
99
100 extern long afs_xsetgroups(int gidsetsize, gid_t * grouplist);
101 asmlinkage long (*sys_setgroupsp) (int gidsetsize, gid_t * grouplist);
102
103 extern int afs_xsetgroups32(int gidsetsize, gid_t * grouplist);
104 asmlinkage int (*sys_setgroups32p) (int gidsetsize,
105                                     __kernel_gid32_t * grouplist);
106
107 /***** AMD64 *****/
108 #ifdef AFS_AMD64_LINUX20_ENV
109 static SYSCALLTYPE *afs_ia32_sys_call_table;
110 static SYSCALLTYPE ia32_ni_syscall = 0;
111
112 extern int afs32_xsetgroups();
113 asmlinkage long (*sys32_setgroupsp) (int gidsetsize, u16 * grouplist);
114 extern int afs32_xsetgroups32();
115 asmlinkage long (*sys32_setgroups32p) (int gidsetsize, gid_t * grouplist);
116 #endif /* AFS_AMD64_LINUX20_ENV */
117
118
119 /***** PPC64 *****/
120 #ifdef AFS_PPC64_LINUX26_ENV
121 static SYSCALLTYPE *afs_sys_call_table32;
122 static SYSCALLTYPE afs_ni_syscall32 = 0;
123 static SYSCALLTYPE old_sys_setgroupsp = 0;
124 static SYSCALLTYPE old_sys32_setgroupsp = 0;
125
126 extern int afs32_xsetgroups();
127 asmlinkage long (*sys32_setgroupsp)(int gidsetsize, gid_t *grouplist);
128
129 asmlinkage long sys_close(unsigned int fd);
130 static void sys_setgroups_stub() 
131         __attribute__ ((pure,const,no_instrument_function));
132 static void sys_setgroups_stub() 
133
134         printf("*** error! sys_setgroups_stub called\n");
135 }
136
137 static void sys32_setgroups_stub() 
138         __attribute__ ((pure,const,no_instrument_function));
139 static void sys32_setgroups_stub() 
140
141         printf("*** error! sys32_setgroups_stub called\n");
142 }
143
144 #endif /* AFS_PPC64_LINUX26_ENV */
145
146
147 /***** SPARC64 *****/
148 #ifdef AFS_SPARC64_LINUX26_ENV
149 static SYSCALLTYPE *afs_sys_call_table32;
150 static SYSCALLTYPE afs_ni_syscall32 = 0;
151
152 extern int afs32_xsetgroups();
153 asmlinkage int (*sys32_setgroupsp) (int gidsetsize,
154                                     __kernel_gid32_t * grouplist);
155 /* This number is not exported for some bizarre reason. */
156 #define __NR_setgroups32      82
157 extern int afs32_xsetgroups32();
158 asmlinkage int (*sys32_setgroups32p) (int gidsetsize,
159                                       __kernel_gid32_t * grouplist);
160
161 asmlinkage int
162 afs_syscall32(long syscall, long parm1, long parm2, long parm3, long parm4,
163               long parm5)
164 {
165     __asm__ __volatile__("srl %o4, 0, %o4\n\t"
166                          "mov %o7, %i7\n\t"
167                          "call afs_syscall\n\t"
168                          "srl %o5, 0, %o5\n\t"
169                          "ret\n\t"
170                          "nop");
171 }
172 #endif /* AFS_SPARC64_LINUX20_ENV */
173
174
175 /***** IA64 *****/
176 #ifdef AFS_IA64_LINUX20_ENV
177
178 asmlinkage long
179 afs_syscall_stub(int r0, int r1, long r2, long r3, long r4, long gp)
180 {
181     __asm__ __volatile__("alloc r42 = ar.pfs, 8, 3, 6, 0\n\t"
182                          "mov r41 = b0\n\t"     /* save rp */
183                          "mov out0 = in0\n\t"
184                          "mov out1 = in1\n\t"
185                          "mov out2 = in2\n\t"
186                          "mov out3 = in3\n\t"
187                          "mov out4 = in4\n\t"
188                          "mov out5 = gp\n\t"    /* save gp */
189                          ";;\n"
190                          ".L1:\n\t"
191                          "mov r3 = ip\n\t"
192                          ";;\n\t"
193                          "addl r15=.fptr_afs_syscall-.L1,r3\n\t"
194                          ";;\n\t"
195                          "ld8 r15=[r15]\n\t"
196                          ";;\n\t"
197                          "ld8 r16=[r15],8\n\t"
198                          ";;\n\t"
199                          "ld8 gp=[r15]\n\t"
200                          "mov b6=r16\n\t"
201                          "br.call.sptk.many b0 = b6\n\t"
202                          ";;\n\t"
203                          "mov ar.pfs = r42\n\t"
204                          "mov b0 = r41\n\t"
205                          "mov gp = r48\n\t"     /* restore gp */
206                          "br.ret.sptk.many b0\n"
207                          ".fptr_afs_syscall:\n\t"
208                          "data8 @fptr(afs_syscall)\n\t"
209                          ".skip 8");
210 }
211
212 asmlinkage long
213 afs_xsetgroups_stub(int r0, int r1, long r2, long r3, long r4, long gp)
214 {
215     __asm__ __volatile__("alloc r42 = ar.pfs, 8, 3, 6, 0\n\t"
216                          "mov r41 = b0\n\t"     /* save rp */
217                          "mov out0 = in0\n\t"
218                          "mov out1 = in1\n\t"
219                          "mov out2 = in2\n\t"
220                          "mov out3 = in3\n\t"
221                          "mov out4 = in4\n\t"
222                          "mov out5 = gp\n\t"    /* save gp */
223                          ";;\n"
224                          ".L2:\n\t"
225                          "mov r3 = ip\n\t"
226                          ";;\n\t"
227                          "addl r15=.fptr_afs_xsetgroups - .L2,r3\n\t"
228                          ";;\n\t"
229                          "ld8 r15=[r15]\n\t"
230                          ";;\n\t"
231                          "ld8 r16=[r15],8\n\t"
232                          ";;\n\t"
233                          "ld8 gp=[r15]\n\t"
234                          "mov b6=r16\n\t"
235                          "br.call.sptk.many b0 = b6\n\t"
236                          ";;\n\t"
237                          "mov ar.pfs = r42\n\t"
238                          "mov b0 = r41\n\t"
239                          "mov gp = r48\n\t"     /* restore gp */
240                          "br.ret.sptk.many b0\n"
241                          ".fptr_afs_xsetgroups:\n\t"
242                          "data8 @fptr(afs_xsetgroups)\n\t"
243                          ".skip 8");
244 }
245
246 struct fptr {
247     void *ip;
248     unsigned long gp;
249 };
250
251 #endif /* AFS_IA64_LINUX20_ENV */
252
253 /***** PPC64 ***** 
254  * Spring 2005
255  * sys_call_table hook for PPC64 
256  * by Soewono Effendi <Soewono.Effendi@sysgo.de>
257  * for IBM Deutschland
258  * Thanks go to SYSGO's team for their support:
259  * Horst Birthelmer <Horst.Birthelmer@sysgo.de>
260  * Marius Groeger <Marius.Groeger@sysgo.de>
261  */
262 #if defined(AFS_PPC64_LINUX26_ENV)
263 extern void flush_cache(void *, unsigned long);
264 #define PPC_LO(v) ((v) & 0xffff)
265 #define PPC_HI(v) (((v) >> 16) & 0xffff)
266 #define PPC_HA(v) PPC_HI ((v) + 0x8000)
267 #define PPC_HLO(v) ((short)(((v) >> 32) & 0xffff))
268 #define PPC_HHI(v) ((short)(((v) >> 48) & 0xffff))
269
270 struct ppc64_opd
271 {
272         unsigned long funcaddr;
273         unsigned long r2;
274 };
275
276 struct ppc64_stub
277 {
278         unsigned char jump[136];
279         unsigned long r2;
280         unsigned long lr;
281         struct ppc64_opd opd;
282 } __attribute__ ((packed));
283
284 /* a stub to fix up r2 (TOC ptr) and to jump to our sys_call hook
285    function.  We patch the new r2 value and function pointer into 
286    the stub. */
287 #define PPC64_STUB(stub) \
288 static struct ppc64_stub stub = \
289 { .jump = { \
290         0xf8, 0x41, 0x00, 0x28, /*     std     r2,40(r1) */ \
291         0xfb, 0xc1, 0xff, 0xf0, /*     std     r30,-16(r1) */ \
292         0xfb, 0xa1, 0xff, 0xe8, /*     std     r29,-24(r1) */ \
293         0x7c, 0x5d, 0x13, 0x78, /*     mr      r29,r2 */ \
294         0x3c, 0x40, 0x12, 0x34, /*16:  lis     r2,4660 */ \
295         0x60, 0x42, 0x56, 0x78, /*20:  ori     r2,r2,22136 */ \
296         0x78, 0x42, 0x07, 0xc6, /*     rldicr  r2,r2,32,31 */ \
297         0x64, 0x42, 0x90, 0xab, /*28:  oris    r2,r2,37035 */ \
298         0x60, 0x42, 0xcd, 0xef, /*32:  ori     r2,r2,52719 */ \
299         0x3f, 0xc2, 0x00, 0x00, /*36:  addis   r30,r2,0 */ \
300         0x3b, 0xde, 0x00, 0x00, /*40:  addi    r30,r30,0 */ \
301         0xfb, 0xbe, 0x00, 0x88, /*     std     r29,136(r30) */ \
302         0x7f, 0xa8, 0x02, 0xa6, /*     mflr    r29 */ \
303         0xfb, 0xbe, 0x00, 0x90, /*     std     r29,144(r30) */ \
304         0xeb, 0xde, 0x00, 0x98, /*     ld      r30,152(r30) */ \
305         0x7f, 0xc8, 0x03, 0xa6, /*     mtlr    r30 */ \
306         0xeb, 0xa1, 0xff, 0xe8, /*     ld      r29,-24(r1) */ \
307         0xeb, 0xc1, 0xff, 0xf0, /*     ld      r30,-16(r1) */ \
308         0x4e, 0x80, 0x00, 0x21, /*     blrl */ \
309         0x3c, 0x40, 0x12, 0x34, /*76:  lis     r2,4660 */ \
310         0x60, 0x42, 0x56, 0x78, /*80:  ori     r2,r2,22136 */ \
311         0x78, 0x42, 0x07, 0xc6, /*     rldicr  r2,r2,32,31 */ \
312         0x64, 0x42, 0x90, 0xab, /*88:  oris    r2,r2,37035 */ \
313         0x60, 0x42, 0xcd, 0xef, /*92:  ori     r2,r2,52719 */ \
314         0xfb, 0xc1, 0xff, 0xf0, /*     std     r30,-16(r1) */ \
315         0xfb, 0xa1, 0xff, 0xe8, /*     std     r29,-24(r1) */ \
316         0x3f, 0xc2, 0xab, 0xcd, /*104: addis   r30,r2,-21555 */ \
317         0x3b, 0xde, 0x78, 0x90, /*108: addi    r30,r30,30864 */ \
318         0xeb, 0xbe, 0x00, 0x90, /*     ld      r29,144(r30) */ \
319         0x7f, 0xa8, 0x03, 0xa6, /*     mtlr    r29 */ \
320         0xe8, 0x5e, 0x00, 0x88, /*     ld      r2,136(r30) */ \
321         0xeb, 0xa1, 0xff, 0xe8, /*     ld      r29,-24(r1) */ \
322         0xeb, 0xc1, 0xff, 0xf0, /*     ld      r30,-16(r1) */ \
323         0x4e, 0x80, 0x00, 0x20  /*     blr */ \
324 }} 
325
326 static void * create_stub(struct ppc64_stub *stub,
327                           struct ppc64_opd *opd)
328 {
329         unsigned short *p1, *p2, *p3, *p4;
330         unsigned long addr;
331
332         stub->opd.funcaddr = opd->funcaddr;
333         stub->opd.r2 = opd->r2;
334         addr = (unsigned long) opd->r2;
335         p1 = (unsigned short*) &stub->jump[18];
336         p2 = (unsigned short*) &stub->jump[22];
337         p3 = (unsigned short*) &stub->jump[30];
338         p4 = (unsigned short*) &stub->jump[34];
339
340         *p1 = PPC_HHI(addr);
341         *p2 = PPC_HLO(addr);
342         *p3 = PPC_HI(addr);
343         *p4 = PPC_LO(addr);
344
345         addr = (unsigned long) stub - opd->r2;
346         p1 = (unsigned short*) &stub->jump[38];
347         p2 = (unsigned short*) &stub->jump[42];
348         *p1 = PPC_HA(addr);
349         *p2 = PPC_LO(addr);
350         p1 = (unsigned short*) &stub->jump[106];
351         p2 = (unsigned short*) &stub->jump[110];
352         *p1 = PPC_HA(addr);
353         *p2 = PPC_LO(addr);
354
355         addr = (unsigned long) opd->r2;
356         p1 = (unsigned short*) &stub->jump[78];
357         p2 = (unsigned short*) &stub->jump[82];
358         p3 = (unsigned short*) &stub->jump[90];
359         p4 = (unsigned short*) &stub->jump[94];
360
361         *p1 = PPC_HHI(addr);
362         *p2 = PPC_HLO(addr);
363         *p3 = PPC_HI(addr);
364         *p4 = PPC_LO(addr);
365
366         flush_cache((void *)stub, sizeof(*stub));
367         return ((void*)(stub));
368 }
369
370 PPC64_STUB(afs_sys_call_stub);
371 PPC64_STUB(afs_xsetgroups_stub);
372 PPC64_STUB(afs_xsetgroups32_stub);
373 #endif /* AFS_PPC64_LINUX26_ENV */
374
375
376 /**********************************************************************/
377 /********************* System Call Initialization *********************/
378 /**********************************************************************/
379
380 int osi_syscall_init(void)
381 {
382 /***** IA64 *****/
383 #ifdef AFS_IA64_LINUX20_ENV
384     /* This needs to be first because we are declaring variables, and
385      * also because the handling of syscall pointers is bizarre enough
386      * that we want to special-case even the "common" part.
387      */
388     unsigned long kernel_gp = 0;
389     static struct fptr sys_setgroups;
390
391     afs_sys_call_table = osi_find_syscall_table(0);
392     if (afs_sys_call_table) {
393
394         /* check we aren't already loaded */
395         /* XXX this can't be right */
396         if (SYSCALL2POINTER afs_sys_call_table[_S(__NR_afs_syscall)]
397             == afs_syscall) {
398             printf("AFS syscall entry point already in use!\n");
399             return -EBUSY;
400         }
401
402         /* setup AFS entry point */
403         afs_ni_syscall = afs_sys_call_table[_S(__NR_afs_syscall)];
404         afs_sys_call_table[_S(__NR_afs_syscall)] =
405                 POINTER2SYSCALL((struct fptr *)afs_syscall_stub)->ip;
406
407         /* setup setgroups */
408         sys_setgroupsp = (void *)&sys_setgroups;
409
410         ((struct fptr *)sys_setgroupsp)->ip =
411             SYSCALL2POINTER afs_sys_call_table[_S(__NR_setgroups)];
412         ((struct fptr *)sys_setgroupsp)->gp = kernel_gp;
413
414         afs_sys_call_table[_S(__NR_setgroups)] =
415             POINTER2SYSCALL((struct fptr *)afs_xsetgroups_stub)->ip;
416     }
417
418     /* XXX no 32-bit syscalls on IA64? */
419
420
421 #elif defined(AFS_PPC64_LINUX26_ENV)
422
423     afs_sys_call_table = osi_find_syscall_table(0);
424     if (afs_sys_call_table) {
425         SYSCALLTYPE p;
426         struct ppc64_opd* opd = (struct ppc64_opd*) sys_close;
427         unsigned long r2 = opd->r2;
428         opd = (struct ppc64_opd*) afs_syscall;
429         afs_sys_call_table32 = (unsigned long)afs_sys_call_table - 
430                 NR_syscalls * sizeof(SYSCALLTYPE);
431         /* check we aren't already loaded */
432         p = SYSCALL2POINTER afs_sys_call_table[_S(__NR_afs_syscall)];
433         if ((unsigned long)p == opd->funcaddr) {
434             printf("AFS syscall entry point already in use!\n");
435             return -EBUSY;
436         }
437         /* setup AFS entry point */
438         p = create_stub(&afs_sys_call_stub, opd);
439         afs_ni_syscall = afs_sys_call_table[_S(__NR_afs_syscall)];
440         afs_sys_call_table[_S(__NR_afs_syscall)] = POINTER2SYSCALL p;
441
442         /* setup setgroups */
443         opd = (struct ppc64_opd*) afs_xsetgroups;
444         p = create_stub(&afs_xsetgroups_stub, opd);
445         old_sys_setgroupsp = SYSCALL2POINTER afs_sys_call_table[_S(__NR_setgroups)];
446         afs_sys_call_table[_S(__NR_setgroups)] = POINTER2SYSCALL p;
447         opd = (struct ppc64_opd*) sys_setgroups_stub;
448         opd->funcaddr = old_sys_setgroupsp;
449         opd->r2 = r2;
450
451         /* setup setgroups32 */
452         opd = (struct ppc64_opd*) afs32_xsetgroups;
453         p = create_stub(&afs_xsetgroups32_stub, opd);
454         old_sys32_setgroupsp = SYSCALL2POINTER afs_sys_call_table32[_S(__NR_setgroups)];
455         afs_sys_call_table32[_S(__NR_setgroups)] = POINTER2SYSCALL p;
456         opd = (struct ppc64_opd*) sys32_setgroups_stub;
457         opd->funcaddr = old_sys32_setgroupsp;
458         opd->r2 = r2;
459
460         flush_cache((void *)afs_sys_call_table, 2*NR_syscalls*sizeof(void*));
461
462         sys_setgroupsp = sys_setgroups_stub;
463         sys32_setgroupsp = sys32_setgroups_stub;
464     }
465 /***** COMMON (except IA64 or PPC64) *****/
466 #else /* !AFS_IA64_LINUX20_ENV */
467
468     afs_sys_call_table = osi_find_syscall_table(0);
469     if (afs_sys_call_table) {
470
471         /* check we aren't already loaded */
472         if (SYSCALL2POINTER afs_sys_call_table[_S(__NR_afs_syscall)]
473             == afs_syscall) {
474             printf("AFS syscall entry point already in use!\n");
475             return -EBUSY;
476         }
477
478         /* setup AFS entry point */
479         afs_ni_syscall = afs_sys_call_table[_S(__NR_afs_syscall)];
480
481         INSERT_SYSCALL(__NR_afs_syscall, afs_syscall_page, afs_syscall)
482
483         /* setup setgroups */
484         sys_setgroupsp = SYSCALL2POINTER afs_sys_call_table[_S(__NR_setgroups)];
485         INSERT_SYSCALL(__NR_setgroups, afs_sys_setgroups_page, afs_xsetgroups)
486
487 #if defined(__NR_setgroups32)
488         /* setup setgroups32 */
489         sys_setgroups32p = SYSCALL2POINTER afs_sys_call_table[__NR_setgroups32];
490         INSERT_SYSCALL(__NR_setgroups32, afs_sys_setgroups32_page, afs_xsetgroups32)
491 #endif
492     }
493 #endif /* !AFS_IA64_LINUX20_ENV */
494
495
496 /***** AMD64 *****/
497 #ifdef AFS_AMD64_LINUX20_ENV
498     afs_ia32_sys_call_table = osi_find_syscall_table(1);
499     if (afs_ia32_sys_call_table) {
500         /* setup AFS entry point for IA32 */
501         ia32_ni_syscall = afs_ia32_sys_call_table[__NR_ia32_afs_syscall];
502         afs_ia32_sys_call_table[__NR_ia32_afs_syscall] =
503             POINTER2SYSCALL afs_syscall;
504
505         /* setup setgroups for IA32 */
506         sys32_setgroupsp =
507             SYSCALL2POINTER afs_ia32_sys_call_table[__NR_ia32_setgroups];
508         afs_ia32_sys_call_table[__NR_ia32_setgroups] =
509             POINTER2SYSCALL afs32_xsetgroups;
510
511         /* setup setgroups32 for IA32 */
512         sys32_setgroups32p =
513             SYSCALL2POINTER afs_ia32_sys_call_table[__NR_ia32_setgroups32];
514         afs_ia32_sys_call_table[__NR_ia32_setgroups32] =
515             POINTER2SYSCALL afs32_xsetgroups32;
516     }
517 #endif /* AFS_AMD64_LINUX20_ENV */
518
519
520 /***** SPARC64 *****/
521 #ifdef AFS_SPARC64_LINUX20_ENV
522     afs_sys_call_table32 = osi_find_syscall_table(1);
523     if (afs_sys_call_table32) {
524         /* setup AFS entry point for 32-bit SPARC */
525         afs_ni_syscall32 = afs_sys_call_table32[__NR_afs_syscall];
526         afs_sys_call_table32[__NR_afs_syscall] = POINTER2SYSCALL afs_syscall32;
527
528         /* setup setgroups for 32-bit SPARC */
529         sys32_setgroupsp = SYSCALL2POINTER afs_sys_call_table32[__NR_setgroups];
530         afs_sys_call_table32[__NR_setgroups] = POINTER2SYSCALL afs32_xsetgroups;
531
532         /* setup setgroups32 for 32-bit SPARC */
533         sys32_setgroups32p =
534             SYSCALL2POINTER afs_sys_call_table32[__NR_setgroups32];
535         afs_sys_call_table32[__NR_setgroups32] =
536             POINTER2SYSCALL afs32_xsetgroups32;
537     }
538 #endif /* AFS_SPARC64_LINUX20_ENV */
539     return 0;
540 }
541
542
543
544 /**********************************************************************/
545 /************************ System Call Cleanup *************************/
546 /**********************************************************************/
547
548 void osi_syscall_clean(void)
549 {
550 /***** COMMON *****/
551     if (afs_sys_call_table) {
552         /* put back the AFS entry point */
553         afs_sys_call_table[_S(__NR_afs_syscall)] = afs_ni_syscall;
554
555         /* put back setgroups */
556 #if defined(AFS_IA64_LINUX20_ENV)
557         afs_sys_call_table[_S(__NR_setgroups)] =
558             POINTER2SYSCALL((struct fptr *)sys_setgroupsp)->ip;
559 #elif defined(AFS_PPC64_LINUX26_ENV)
560         afs_sys_call_table[_S(__NR_setgroups)] =
561             POINTER2SYSCALL old_sys_setgroupsp;
562         /* put back setgroups32 for PPC64 */
563         afs_sys_call_table32[__NR_setgroups] =
564             POINTER2SYSCALL old_sys32_setgroupsp;
565 #else /* AFS_IA64_LINUX20_ENV */
566         afs_sys_call_table[_S(__NR_setgroups)] =
567             POINTER2SYSCALL sys_setgroupsp;
568 #endif
569
570 #if defined(__NR_setgroups32) && !defined(AFS_IA64_LINUX20_ENV)
571         /* put back setgroups32 */
572         afs_sys_call_table[__NR_setgroups32] = POINTER2SYSCALL sys_setgroups32p;
573 #endif
574 #if defined(AFS_S390X_LINUX24_ENV)
575 #if defined(__NR_setgroups32) && !defined(AFS_IA64_LINUX20_ENV)
576         if (afs_sys_setgroups32_page)
577             kfree(afs_sys_setgroups32_page);
578 #endif
579         if (afs_sys_setgroups_page)
580             kfree(afs_sys_setgroups_page);
581         if (afs_syscall_page)
582             kfree(afs_syscall_page);
583 #endif
584     }
585
586
587 /***** IA64 *****/
588 #ifdef AFS_IA64_LINUX20_ENV
589     /* XXX no 32-bit syscalls on IA64? */
590 #endif
591
592
593 /***** AMD64 *****/
594 #ifdef AFS_AMD64_LINUX20_ENV
595     if (afs_ia32_sys_call_table) {
596         /* put back AFS entry point for IA32 */
597         afs_ia32_sys_call_table[__NR_ia32_afs_syscall] =
598             POINTER2SYSCALL ia32_ni_syscall;
599
600         /* put back setgroups for IA32 */
601         afs_ia32_sys_call_table[__NR_ia32_setgroups] =
602             POINTER2SYSCALL sys32_setgroupsp;
603
604         /* put back setgroups32 for IA32 */
605         afs_ia32_sys_call_table[__NR_ia32_setgroups32] =
606             POINTER2SYSCALL sys32_setgroups32p;
607     }
608 #endif
609
610
611 /***** SPARC64 *****/
612 #ifdef AFS_SPARC64_LINUX20_ENV
613     if (afs_sys_call_table32) {
614         /* put back AFS entry point for 32-bit SPARC */
615         afs_sys_call_table32[__NR_afs_syscall] = afs_ni_syscall32;
616
617         /* put back setgroups for IA32 */
618         afs_sys_call_table32[__NR_setgroups] =
619             POINTER2SYSCALL sys32_setgroupsp;
620
621         /* put back setgroups32 for IA32 */
622         afs_sys_call_table32[__NR_setgroups32] =
623             POINTER2SYSCALL sys32_setgroups32p;
624     }
625 #endif
626 }