2 * Copyright 1996-1998 John D. Polstra.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 * from: src/sys/i386/i386/elf_machdep.c,v 1.20 2004/08/11 02:35:05 marcel
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
31 #include <sys/param.h>
32 #include <sys/kernel.h>
33 #include <sys/systm.h>
35 #include <sys/imgact.h>
36 #include <sys/linker.h>
37 #include <sys/sysent.h>
38 #include <sys/imgact_elf.h>
40 #include <sys/syscall.h>
41 #include <sys/signalvar.h>
42 #include <sys/vnode.h>
46 #include <vm/vm_param.h>
48 #include <machine/elf.h>
49 #include <machine/md_var.h>
50 #include <machine/cache.h>
53 struct sysentvec elf64_freebsd_sysvec = {
54 .sv_size = SYS_MAXSYSCALL,
62 .sv_fixup = __elfN(freebsd_fixup),
63 .sv_sendsig = sendsig,
64 .sv_sigcode = sigcode,
65 .sv_szsigcode = &szsigcode,
66 .sv_prepsyscall = NULL,
67 .sv_name = "FreeBSD ELF64",
68 .sv_coredump = __elfN(coredump),
69 .sv_imgact_try = NULL,
70 .sv_minsigstksz = MINSIGSTKSZ,
71 .sv_pagesize = PAGE_SIZE,
72 .sv_minuser = VM_MIN_ADDRESS,
73 .sv_maxuser = VM_MAXUSER_ADDRESS,
74 .sv_usrstack = USRSTACK,
75 .sv_psstrings = PS_STRINGS,
76 .sv_stackprot = VM_PROT_ALL,
77 .sv_copyout_strings = exec_copyout_strings,
78 .sv_setregs = exec_setregs,
81 .sv_flags = SV_ABI_FREEBSD | SV_LP64,
82 .sv_set_syscall_retval = cpu_set_syscall_retval,
83 .sv_fetch_syscall_args = cpu_fetch_syscall_args,
84 .sv_syscallnames = syscallnames,
88 static Elf64_Brandinfo freebsd_brand_info = {
89 .brand = ELFOSABI_FREEBSD,
91 .compat_3_brand = "FreeBSD",
93 .interp_path = "/libexec/ld-elf.so.1",
94 .sysvec = &elf64_freebsd_sysvec,
95 .interp_newpath = NULL,
99 SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_ANY,
100 (sysinit_cfunc_t) elf64_insert_brand_entry,
101 &freebsd_brand_info);
104 elf64_dump_thread(struct thread *td __unused, void *dst __unused,
105 size_t *off __unused)
109 struct sysentvec elf32_freebsd_sysvec = {
110 .sv_size = SYS_MAXSYSCALL,
117 .sv_transtrap = NULL,
118 .sv_fixup = __elfN(freebsd_fixup),
119 .sv_sendsig = sendsig,
120 .sv_sigcode = sigcode,
121 .sv_szsigcode = &szsigcode,
122 .sv_prepsyscall = NULL,
123 .sv_name = "FreeBSD ELF32",
124 .sv_coredump = __elfN(coredump),
125 .sv_imgact_try = NULL,
126 .sv_minsigstksz = MINSIGSTKSZ,
127 .sv_pagesize = PAGE_SIZE,
128 .sv_minuser = VM_MIN_ADDRESS,
129 .sv_maxuser = VM_MAXUSER_ADDRESS,
130 .sv_usrstack = USRSTACK,
131 .sv_psstrings = PS_STRINGS,
132 .sv_stackprot = VM_PROT_ALL,
133 .sv_copyout_strings = exec_copyout_strings,
134 .sv_setregs = exec_setregs,
137 .sv_flags = SV_ABI_FREEBSD | SV_ILP32,
138 .sv_set_syscall_retval = cpu_set_syscall_retval,
139 .sv_fetch_syscall_args = cpu_fetch_syscall_args,
140 .sv_syscallnames = syscallnames,
141 .sv_schedtail = NULL,
144 static Elf32_Brandinfo freebsd_brand_info = {
145 .brand = ELFOSABI_FREEBSD,
147 .compat_3_brand = "FreeBSD",
149 .interp_path = "/libexec/ld-elf.so.1",
150 .sysvec = &elf32_freebsd_sysvec,
151 .interp_newpath = NULL,
155 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
156 (sysinit_cfunc_t) elf32_insert_brand_entry,
157 &freebsd_brand_info);
160 elf32_dump_thread(struct thread *td __unused, void *dst __unused,
161 size_t *off __unused)
166 /* Process one elf relocation with addend. */
168 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
169 int type, int local, elf_lookup_fn lookup)
171 Elf32_Addr *where = (Elf32_Addr *)NULL;
173 Elf_Addr addend = (Elf_Addr)0;
174 Elf_Word rtype = (Elf_Word)0, symidx;
175 const Elf_Rel *rel = NULL;
176 const Elf_Rela *rela = NULL;
179 * Stash R_MIPS_HI16 info so we can use it when processing R_MIPS_LO16
182 static Elf32_Addr *where_hi16;
186 rel = (const Elf_Rel *)data;
187 where = (Elf32_Addr *) (relocbase + rel->r_offset);
188 rtype = ELF_R_TYPE(rel->r_info);
189 symidx = ELF_R_SYM(rel->r_info);
192 addend = *(Elf64_Addr *)where;
201 rela = (const Elf_Rela *)data;
202 where = (Elf32_Addr *) (relocbase + rela->r_offset);
203 addend = rela->r_addend;
204 rtype = ELF_R_TYPE(rela->r_info);
205 symidx = ELF_R_SYM(rela->r_info);
208 panic("unknown reloc type %d\n", type);
212 case R_MIPS_NONE: /* none */
215 case R_MIPS_32: /* S + A */
216 addr = lookup(lf, symidx, 1);
221 *where = (Elf32_Addr)addr;
224 case R_MIPS_26: /* ((A << 2) | (P & 0xf0000000) + S) >> 2 */
225 addr = lookup(lf, symidx, 1);
229 addend &= 0x03ffffff;
231 * Addendum for .rela R_MIPS_26 is not shifted right
236 addr += ((Elf_Addr)where & 0xf0000000) | addend;
239 *where &= ~0x03ffffff;
240 *where |= addr & 0x03ffffff;
243 case R_MIPS_64: /* S + A */
244 addr = lookup(lf, symidx, 1);
248 if (*(Elf64_Addr*)where != addr)
249 *(Elf64_Addr*)where = addr;
252 case R_MIPS_HI16: /* ((AHL + S) - ((short)(AHL + S)) >> 16 */
254 addr = lookup(lf, symidx, 1);
258 *where &= 0xffff0000;
259 *where |= ((((long long) addr + 0x8000LL) >> 16) & 0xffff);
267 case R_MIPS_LO16: /* AHL + S */
269 addr = lookup(lf, symidx, 1);
273 *where &= 0xffff0000;
274 *where |= addr & 0xffff;
277 ahl += (int16_t)addend;
278 addr = lookup(lf, symidx, 1);
282 addend &= 0xffff0000;
283 addend |= (uint16_t)(ahl + addr);
286 addend = *where_hi16;
287 addend &= 0xffff0000;
288 addend |= ((ahl + addr) - (int16_t)(ahl + addr)) >> 16;
289 *where_hi16 = addend;
294 case R_MIPS_HIGHER: /* %higher(A+S) */
295 addr = lookup(lf, symidx, 1);
299 *where &= 0xffff0000;
300 *where |= (((long long)addr + 0x80008000LL) >> 32) & 0xffff;
303 case R_MIPS_HIGHEST: /* %highest(A+S) */
304 addr = lookup(lf, symidx, 1);
308 *where &= 0xffff0000;
309 *where |= (((long long)addr + 0x800080008000LL) >> 48) & 0xffff;
313 printf("kldload: unexpected relocation type %d\n",
322 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
323 elf_lookup_fn lookup)
326 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
330 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
331 int type, elf_lookup_fn lookup)
334 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
338 elf_cpu_load_file(linker_file_t lf __unused)
342 * Sync the I and D caches to make sure our relocations are visible.
344 mips_icache_sync_all();
350 elf_cpu_unload_file(linker_file_t lf __unused)