1*b722ba42Sguenther /* $OpenBSD: rtld_machine.c,v 1.42 2022/01/08 06:49:41 guenther Exp $ */
25188cfd6Sdrahn
35188cfd6Sdrahn /*
45188cfd6Sdrahn * Copyright (c) 2004 Dale Rahn
55188cfd6Sdrahn *
65188cfd6Sdrahn * Redistribution and use in source and binary forms, with or without
75188cfd6Sdrahn * modification, are permitted provided that the following conditions
85188cfd6Sdrahn * are met:
95188cfd6Sdrahn * 1. Redistributions of source code must retain the above copyright
105188cfd6Sdrahn * notice, this list of conditions and the following disclaimer.
115188cfd6Sdrahn * 2. Redistributions in binary form must reproduce the above copyright
125188cfd6Sdrahn * notice, this list of conditions and the following disclaimer in the
135188cfd6Sdrahn * documentation and/or other materials provided with the distribution.
145188cfd6Sdrahn *
155188cfd6Sdrahn * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
165188cfd6Sdrahn * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
175188cfd6Sdrahn * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
185188cfd6Sdrahn * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
195188cfd6Sdrahn * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
205188cfd6Sdrahn * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
215188cfd6Sdrahn * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
225188cfd6Sdrahn * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
235188cfd6Sdrahn * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
245188cfd6Sdrahn * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
255188cfd6Sdrahn * SUCH DAMAGE.
265188cfd6Sdrahn *
275188cfd6Sdrahn */
285188cfd6Sdrahn
295188cfd6Sdrahn #define _DYN_LOADER
305188cfd6Sdrahn
315188cfd6Sdrahn #include <sys/types.h>
32*b722ba42Sguenther #include <sys/exec_elf.h>
3343eb4821Sguenther #include <sys/syscall.h>
3443eb4821Sguenther #include <sys/unistd.h>
355188cfd6Sdrahn
36*b722ba42Sguenther #include <machine/reloc.h>
375188cfd6Sdrahn
38*b722ba42Sguenther #include "util.h"
395188cfd6Sdrahn #include "resolve.h"
405188cfd6Sdrahn
4143eb4821Sguenther int64_t pcookie __attribute__((section(".openbsd.randomdata"))) __dso_hidden;
4243eb4821Sguenther
435188cfd6Sdrahn void _dl_bind_start(void); /* XXX */
445188cfd6Sdrahn Elf_Addr _dl_bind(elf_object_t *object, int reloff);
45c8754c30Sguenther #define _RF_S 0x80000000 /* Resolve symbol */
46c8754c30Sguenther #define _RF_A 0x40000000 /* Use addend */
47c8754c30Sguenther #define _RF_P 0x20000000 /* Location relative */
48c8754c30Sguenther #define _RF_G 0x10000000 /* GOT offset */
49c8754c30Sguenther #define _RF_B 0x08000000 /* Load address relative */
50c8754c30Sguenther #define _RF_E 0x02000000 /* ERROR */
51c8754c30Sguenther #define _RF_SZ(s) (((s) & 0xff) << 8) /* memory target size */
52c8754c30Sguenther #define _RF_RS(s) ((s) & 0xff) /* right shift */
53c8754c30Sguenther static const int reloc_target_flags[] = {
54c8754c30Sguenther 0, /* 0 NONE */
55c8754c30Sguenther _RF_S|_RF_P|_RF_A| _RF_SZ(32) | _RF_RS(0), /* 1 PC24 */
56c8754c30Sguenther _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* 2 ABS32 */
57c8754c30Sguenther _RF_S|_RF_P|_RF_A| _RF_SZ(32) | _RF_RS(0), /* 3 REL32 */
58c8754c30Sguenther _RF_S|_RF_P|_RF_A| _RF_E, /* 4 REL13 */
59c8754c30Sguenther _RF_S|_RF_A| _RF_E, /* 5 ABS16 */
60c8754c30Sguenther _RF_S|_RF_A| _RF_E, /* 6 ABS12 */
61c8754c30Sguenther _RF_S|_RF_A| _RF_E, /* 7 T_ABS5 */
62c8754c30Sguenther _RF_S|_RF_A| _RF_E, /* 8 ABS8 */
63c8754c30Sguenther _RF_S|_RF_B|_RF_A| _RF_E, /* 9 SBREL32 */
64c8754c30Sguenther _RF_S|_RF_P|_RF_A| _RF_E, /* 10 T_PC22 */
65c8754c30Sguenther _RF_S|_RF_P|_RF_A| _RF_E, /* 11 T_PC8 */
66c8754c30Sguenther _RF_E, /* 12 Reserved */
67c8754c30Sguenther _RF_S|_RF_A| _RF_E, /* 13 SWI24 */
68c8754c30Sguenther _RF_S|_RF_A| _RF_E, /* 14 T_SWI8 */
69c8754c30Sguenther _RF_E, /* 15 OBSL */
70c8754c30Sguenther _RF_E, /* 16 OBSL */
71c8754c30Sguenther _RF_E, /* 17 UNUSED */
72c8754c30Sguenther _RF_E, /* 18 UNUSED */
73c8754c30Sguenther _RF_E, /* 19 UNUSED */
74c8754c30Sguenther _RF_S| _RF_SZ(32) | _RF_RS(0), /* 20 COPY */
75c8754c30Sguenther _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* 21 GLOB_DAT */
76c8754c30Sguenther _RF_S| _RF_SZ(32) | _RF_RS(0), /* 22 JUMP_SLOT */
77c8754c30Sguenther _RF_A| _RF_B| _RF_SZ(32) | _RF_RS(0), /* 23 RELATIVE */
78c8754c30Sguenther _RF_E, /* 24 GOTOFF */
79c8754c30Sguenther _RF_E, /* 25 GOTPC */
80c8754c30Sguenther _RF_E, /* 26 GOT32 */
81c8754c30Sguenther _RF_E, /* 27 PLT32 */
82c8754c30Sguenther _RF_E, /* 28 UNUSED */
83c8754c30Sguenther _RF_E, /* 29 UNUSED */
84c8754c30Sguenther _RF_E, /* 30 UNUSED */
85c8754c30Sguenther _RF_E, /* 31 UNUSED */
86c8754c30Sguenther _RF_E, /* 32 A_PCR 0 */
87c8754c30Sguenther _RF_E, /* 33 A_PCR 8 */
88c8754c30Sguenther _RF_E, /* 34 A_PCR 16 */
89c8754c30Sguenther _RF_E, /* 35 B_PCR 0 */
90c8754c30Sguenther _RF_E, /* 36 B_PCR 12 */
91c8754c30Sguenther _RF_E, /* 37 B_PCR 20 */
92c8754c30Sguenther _RF_E, /* 38 RELAB32 */
93c8754c30Sguenther _RF_E, /* 39 ROSGREL32 */
94c8754c30Sguenther _RF_E, /* 40 V4BX */
95c8754c30Sguenther _RF_E, /* 41 STKCHK */
96c8754c30Sguenther _RF_E /* 42 TSTKCHK */
97c8754c30Sguenther };
98c8754c30Sguenther
99c8754c30Sguenther #define RELOC_RESOLVE_SYMBOL(t) ((reloc_target_flags[t] & _RF_S) != 0)
100c8754c30Sguenther #define RELOC_PC_RELATIVE(t) ((reloc_target_flags[t] & _RF_P) != 0)
101c8754c30Sguenther #define RELOC_BASE_RELATIVE(t) ((reloc_target_flags[t] & _RF_B) != 0)
102c8754c30Sguenther #define RELOC_USE_ADDEND(t) ((reloc_target_flags[t] & _RF_A) != 0)
103c8754c30Sguenther #define RELOC_TARGET_SIZE(t) ((reloc_target_flags[t] >> 8) & 0xff)
104c8754c30Sguenther #define RELOC_VALUE_RIGHTSHIFT(t) (reloc_target_flags[t] & 0xff)
105c8754c30Sguenther
106c8754c30Sguenther static const long reloc_target_bitmask[] = {
107c8754c30Sguenther #define _BM(x) (~(-(1ULL << (x))))
108c8754c30Sguenther _BM(0), /* 0 NONE */
109c8754c30Sguenther _BM(24), /* 1 PC24 */
110c8754c30Sguenther _BM(32), /* 2 ABS32 */
111c8754c30Sguenther _BM(32), /* 3 REL32 */
112c8754c30Sguenther _BM(0), /* 4 REL13 */
113c8754c30Sguenther _BM(0), /* 5 ABS16 */
114c8754c30Sguenther _BM(0), /* 6 ABS12 */
115c8754c30Sguenther _BM(0), /* 7 T_ABS5 */
116c8754c30Sguenther _BM(0), /* 8 ABS8 */
117c8754c30Sguenther _BM(32), /* 9 SBREL32 */
118c8754c30Sguenther _BM(0), /* 10 T_PC22 */
119c8754c30Sguenther _BM(0), /* 11 T_PC8 */
120c8754c30Sguenther _BM(0), /* 12 Reserved */
121c8754c30Sguenther _BM(0), /* 13 SWI24 */
122c8754c30Sguenther _BM(0), /* 14 T_SWI8 */
123c8754c30Sguenther _BM(0), /* 15 OBSL */
124c8754c30Sguenther _BM(0), /* 16 OBSL */
125c8754c30Sguenther _BM(0), /* 17 UNUSED */
126c8754c30Sguenther _BM(0), /* 18 UNUSED */
127c8754c30Sguenther _BM(0), /* 19 UNUSED */
128c8754c30Sguenther _BM(32), /* 20 COPY */
129c8754c30Sguenther _BM(32), /* 21 GLOB_DAT */
130c8754c30Sguenther _BM(32), /* 22 JUMP_SLOT */
131c8754c30Sguenther _BM(32), /* 23 RELATIVE */
132c8754c30Sguenther _BM(0), /* 24 GOTOFF */
133c8754c30Sguenther _BM(0), /* 25 GOTPC */
134c8754c30Sguenther _BM(0), /* 26 GOT32 */
135c8754c30Sguenther _BM(0), /* 27 PLT32 */
136c8754c30Sguenther _BM(0), /* 28 UNUSED */
137c8754c30Sguenther _BM(0), /* 29 UNUSED */
138c8754c30Sguenther _BM(0), /* 30 UNUSED */
139c8754c30Sguenther _BM(0), /* 31 UNUSED */
140c8754c30Sguenther _BM(0), /* 32 A_PCR 0 */
141c8754c30Sguenther _BM(0), /* 33 A_PCR 8 */
142c8754c30Sguenther _BM(0), /* 34 A_PCR 16 */
143c8754c30Sguenther _BM(0), /* 35 B_PCR 0 */
144c8754c30Sguenther _BM(0), /* 36 B_PCR 12 */
145c8754c30Sguenther _BM(0), /* 37 B_PCR 20 */
146c8754c30Sguenther _BM(0), /* 38 RELAB32 */
147c8754c30Sguenther _BM(0), /* 39 ROSGREL32 */
148c8754c30Sguenther _BM(0), /* 40 V4BX */
149c8754c30Sguenther _BM(0), /* 41 STKCHK */
150c8754c30Sguenther _BM(0) /* 42 TSTKCHK */
151c8754c30Sguenther #undef _BM
152c8754c30Sguenther };
153c8754c30Sguenther #define RELOC_VALUE_BITMASK(t) (reloc_target_bitmask[t])
1545188cfd6Sdrahn
1555188cfd6Sdrahn #define R_TYPE(x) R_ARM_ ## x
1565188cfd6Sdrahn
157c8754c30Sguenther void _dl_reloc_plt(Elf_Word *where, Elf_Addr value, Elf_Rel *rel);
158c8754c30Sguenther
1595188cfd6Sdrahn int
_dl_md_reloc(elf_object_t * object,int rel,int relsz)1605188cfd6Sdrahn _dl_md_reloc(elf_object_t *object, int rel, int relsz)
1615188cfd6Sdrahn {
1625188cfd6Sdrahn long i;
1635188cfd6Sdrahn long numrel;
16488098a4dSguenther long relrel;
165c8754c30Sguenther int fails = 0;
1665188cfd6Sdrahn Elf_Addr loff;
16788098a4dSguenther Elf_Addr prev_value = 0;
16888098a4dSguenther const Elf_Sym *prev_sym = NULL;
1695188cfd6Sdrahn Elf_Rel *rels;
1705188cfd6Sdrahn
171ce11e090Skurt loff = object->obj_base;
1725188cfd6Sdrahn numrel = object->Dyn.info[relsz] / sizeof(Elf_Rel);
173c8754c30Sguenther relrel = rel == DT_REL ? object->relcount : 0;
1745188cfd6Sdrahn rels = (Elf_Rel *)(object->Dyn.info[rel]);
1755188cfd6Sdrahn
1765188cfd6Sdrahn if (rels == NULL)
177e3b0f1d9Sguenther return 0;
1785188cfd6Sdrahn
1793b50b772Sguenther if (relrel > numrel)
1803b50b772Sguenther _dl_die("relcount > numrel: %ld > %ld", relrel, numrel);
18188098a4dSguenther
18288098a4dSguenther /* tight loop for leading RELATIVE relocs */
18388098a4dSguenther for (i = 0; i < relrel; i++, rels++) {
18488098a4dSguenther Elf_Addr *where;
18588098a4dSguenther
18688098a4dSguenther where = (Elf_Addr *)(rels->r_offset + loff);
18788098a4dSguenther *where += loff;
18888098a4dSguenther }
18988098a4dSguenther for (; i < numrel; i++, rels++) {
190c8754c30Sguenther Elf_Addr *where, value, mask;
1915188cfd6Sdrahn Elf_Word type;
192143e5accSguenther const Elf_Sym *sym;
1935188cfd6Sdrahn const char *symn;
1945188cfd6Sdrahn
195c8754c30Sguenther type = ELF_R_TYPE(rels->r_info);
196c8754c30Sguenther
197c8754c30Sguenther if (reloc_target_flags[type] & _RF_E)
198c8754c30Sguenther _dl_die("bad relocation %ld %d", i, type);
199c8754c30Sguenther if (type == R_TYPE(NONE))
200c8754c30Sguenther continue;
201c8754c30Sguenther
202c8754c30Sguenther if (type == R_TYPE(JUMP_SLOT) && rel != DT_JMPREL)
203c8754c30Sguenther continue;
204c8754c30Sguenther
2055188cfd6Sdrahn where = (Elf_Addr *)(rels->r_offset + loff);
2065188cfd6Sdrahn
207c8754c30Sguenther if (RELOC_USE_ADDEND(type))
208c8754c30Sguenther #ifdef LDSO_ARCH_IS_RELA_
209c8754c30Sguenther value = rels->r_addend;
210c8754c30Sguenther #else
211c8754c30Sguenther value = *where & RELOC_VALUE_BITMASK(type);
212c8754c30Sguenther #endif
213c8754c30Sguenther else
214c8754c30Sguenther value = 0;
215c8754c30Sguenther
216c8754c30Sguenther sym = NULL;
217c8754c30Sguenther symn = NULL;
218c8754c30Sguenther if (RELOC_RESOLVE_SYMBOL(type)) {
2195188cfd6Sdrahn sym = object->dyn.symtab;
2205188cfd6Sdrahn sym += ELF_R_SYM(rels->r_info);
2215188cfd6Sdrahn symn = object->dyn.strtab + sym->st_name;
2225188cfd6Sdrahn
2235188cfd6Sdrahn if (sym->st_shndx != SHN_UNDEF &&
2245188cfd6Sdrahn ELF_ST_BIND(sym->st_info) == STB_LOCAL) {
2255188cfd6Sdrahn value += loff;
22688098a4dSguenther } else if (sym == prev_sym) {
22788098a4dSguenther value += prev_value;
2285188cfd6Sdrahn } else {
229143e5accSguenther struct sym_res sr;
230143e5accSguenther
231143e5accSguenther sr = _dl_find_symbol(symn,
232c8754c30Sguenther SYM_SEARCH_ALL|SYM_WARNNOTFOUND|
233c8754c30Sguenther ((type == R_TYPE(JUMP_SLOT)) ?
234c8754c30Sguenther SYM_PLT : SYM_NOTPLT), sym, object);
235143e5accSguenther if (sr.sym == NULL) {
236c8754c30Sguenther resolve_failed:
237c8754c30Sguenther if (ELF_ST_BIND(sym->st_info) !=
238c8754c30Sguenther STB_WEAK)
239c8754c30Sguenther fails++;
2405188cfd6Sdrahn continue;
2415188cfd6Sdrahn }
24288098a4dSguenther prev_sym = sym;
243c8754c30Sguenther prev_value = (Elf_Addr)(sr.obj->obj_base +
244c8754c30Sguenther sr.sym->st_value);
24588098a4dSguenther value += prev_value;
2465188cfd6Sdrahn }
247c8754c30Sguenther }
2480e51d825Sguenther
249c8754c30Sguenther if (type == R_TYPE(JUMP_SLOT)) {
250c8754c30Sguenther /*
251c8754c30Sguenther _dl_reloc_plt((Elf_Word *)where, value, rels);
252c8754c30Sguenther */
2530e51d825Sguenther *where = value;
25451a0cd2bSguenther continue;
25551a0cd2bSguenther }
25651a0cd2bSguenther
257c8754c30Sguenther if (type == R_TYPE(COPY)) {
258c8754c30Sguenther void *dstaddr = where;
259c8754c30Sguenther const void *srcaddr;
260c8754c30Sguenther const Elf_Sym *dstsym = sym;
261c8754c30Sguenther struct sym_res sr;
262c8754c30Sguenther
263c8754c30Sguenther sr = _dl_find_symbol(symn,
264c8754c30Sguenther SYM_SEARCH_OTHER|SYM_WARNNOTFOUND|SYM_NOTPLT,
265c8754c30Sguenther dstsym, object);
266c8754c30Sguenther if (sr.sym == NULL)
267c8754c30Sguenther goto resolve_failed;
268c8754c30Sguenther
269c8754c30Sguenther srcaddr = (void *)(sr.obj->obj_base + sr.sym->st_value);
270c8754c30Sguenther _dl_bcopy(srcaddr, dstaddr, dstsym->st_size);
271c8754c30Sguenther continue;
27251a0cd2bSguenther }
27351a0cd2bSguenther
274c8754c30Sguenther if (RELOC_PC_RELATIVE(type))
275c8754c30Sguenther value -= (Elf_Addr)where;
276c8754c30Sguenther if (RELOC_BASE_RELATIVE(type))
277c8754c30Sguenther value += loff;
278c8754c30Sguenther
279c8754c30Sguenther mask = RELOC_VALUE_BITMASK(type);
280c8754c30Sguenther value >>= RELOC_VALUE_RIGHTSHIFT(type);
281c8754c30Sguenther value &= mask;
282c8754c30Sguenther
283c8754c30Sguenther *where &= ~mask;
284c8754c30Sguenther *where |= value;
285c8754c30Sguenther }
286c8754c30Sguenther
287c8754c30Sguenther return fails;
28851a0cd2bSguenther }
28951a0cd2bSguenther
2905188cfd6Sdrahn /*
2915188cfd6Sdrahn * Relocate the Global Offset Table (GOT).
292c8754c30Sguenther * This is done by calling _dl_md_reloc on DT_JMPREL for DL_BIND_NOW,
293c8754c30Sguenther * otherwise the lazy binding plt initialization is performed.
2945188cfd6Sdrahn */
295e9cfe40cSmiod int
_dl_md_reloc_got(elf_object_t * object,int lazy)2965188cfd6Sdrahn _dl_md_reloc_got(elf_object_t *object, int lazy)
2975188cfd6Sdrahn {
298c8754c30Sguenther int fails = 0;
2995188cfd6Sdrahn Elf_Addr *pltgot = (Elf_Addr *)object->Dyn.info[DT_PLTGOT];
300c8754c30Sguenther int i, num;
301c8754c30Sguenther Elf_Rel *rel;
3025188cfd6Sdrahn
3035188cfd6Sdrahn if (object->Dyn.info[DT_PLTREL] != DT_REL)
304e3b0f1d9Sguenther return 0;
3055188cfd6Sdrahn
306c8754c30Sguenther if (!lazy) {
307c8754c30Sguenther fails = _dl_md_reloc(object, DT_JMPREL, DT_PLTRELSZ);
308c8754c30Sguenther } else {
309c8754c30Sguenther rel = (Elf_Rel *)(object->Dyn.info[DT_JMPREL]);
310c8754c30Sguenther num = (object->Dyn.info[DT_PLTRELSZ]);
3115053f5a9Sdrahn
312c8754c30Sguenther for (i = 0; i < num/sizeof(Elf_Rel); i++, rel++) {
3135053f5a9Sdrahn Elf_Addr *where;
314c8754c30Sguenther where = (Elf_Addr *)(rel->r_offset + object->obj_base);
315ce11e090Skurt *where += object->obj_base;
3165053f5a9Sdrahn }
3175053f5a9Sdrahn
318c8754c30Sguenther pltgot[1] = (Elf_Addr)object;
319c8754c30Sguenther pltgot[2] = (Elf_Addr)_dl_bind_start;
320c8754c30Sguenther }
321c8754c30Sguenther
322c8754c30Sguenther return fails;
3235188cfd6Sdrahn }
3245188cfd6Sdrahn
3255188cfd6Sdrahn Elf_Addr
_dl_bind(elf_object_t * object,int relidx)3265053f5a9Sdrahn _dl_bind(elf_object_t *object, int relidx)
3275188cfd6Sdrahn {
3285053f5a9Sdrahn Elf_Rel *rel;
329143e5accSguenther const Elf_Sym *sym;
3305188cfd6Sdrahn const char *symn;
331143e5accSguenther struct sym_res sr;
33243eb4821Sguenther int64_t cookie = pcookie;
33343eb4821Sguenther struct {
33443eb4821Sguenther struct __kbind param;
33543eb4821Sguenther Elf_Word newval;
33643eb4821Sguenther } buf;
3375188cfd6Sdrahn
3385053f5a9Sdrahn rel = ((Elf_Rel *)object->Dyn.info[DT_JMPREL]) + (relidx);
3395188cfd6Sdrahn
3405188cfd6Sdrahn sym = object->dyn.symtab;
3415053f5a9Sdrahn sym += ELF_R_SYM(rel->r_info);
3425188cfd6Sdrahn symn = object->dyn.strtab + sym->st_name;
3435188cfd6Sdrahn
344143e5accSguenther sr = _dl_find_symbol(symn, SYM_SEARCH_ALL|SYM_WARNNOTFOUND|SYM_PLT,
345143e5accSguenther sym, object);
346143e5accSguenther if (sr.sym == NULL)
3473b50b772Sguenther _dl_die("lazy binding failed!");
3485188cfd6Sdrahn
349143e5accSguenther buf.newval = sr.obj->obj_base + sr.sym->st_value;
3505188cfd6Sdrahn
351143e5accSguenther if (__predict_false(sr.obj->traced) && _dl_trace_plt(sr.obj, symn))
352e3b0f1d9Sguenther return buf.newval;
353ae398163Smiod
35443eb4821Sguenther buf.param.kb_addr = (Elf_Addr *)(object->obj_base + rel->r_offset);
35543eb4821Sguenther buf.param.kb_size = sizeof(Elf_Word);
35643eb4821Sguenther
35743eb4821Sguenther /* directly code the syscall, so that it's actually inline here */
35843eb4821Sguenther {
35943eb4821Sguenther register long syscall_num __asm("r12") = SYS_kbind;
36043eb4821Sguenther register void *arg1 __asm("r0") = &buf;
36143eb4821Sguenther register long arg2 __asm("r1") = sizeof(buf);
36243eb4821Sguenther register long arg3 __asm("r2") = 0xffffffff & cookie;
36343eb4821Sguenther register long arg4 __asm("r3") = 0xffffffff & (cookie >> 32);
36443eb4821Sguenther
365f74a2b77Sderaadt __asm volatile("swi 0; dsb nsh; isb" : "+r" (arg1), "+r" (arg2)
36643eb4821Sguenther : "r" (syscall_num), "r" (arg3), "r" (arg4)
36743eb4821Sguenther : "cc", "memory");
3685188cfd6Sdrahn }
3695188cfd6Sdrahn
370e3b0f1d9Sguenther return buf.newval;
3715053f5a9Sdrahn }
372