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.
28 #include <sys/param.h>
29 #include <sys/kernel.h>
30 #include <sys/systm.h>
32 #include <sys/imgact.h>
33 #include <sys/malloc.h>
35 #include <sys/namei.h>
36 #include <sys/fcntl.h>
37 #include <sys/vnode.h>
38 #include <sys/linker.h>
39 #include <sys/sysent.h>
40 #include <sys/imgact_elf.h>
41 #include <sys/syscall.h>
42 #include <sys/signalvar.h>
45 #include <vm/vm_param.h>
47 #include <machine/elf.h>
48 #include <machine/frame.h>
49 #include <machine/md_var.h>
50 #include <machine/unwind.h>
52 Elf_Addr link_elf_get_gp(linker_file_t);
54 extern Elf_Addr fptr_storage[];
56 struct sysentvec elf64_freebsd_sysvec = {
57 .sv_size = SYS_MAXSYSCALL,
65 .sv_fixup = __elfN(freebsd_fixup),
66 .sv_sendsig = sendsig,
69 .sv_prepsyscall = NULL,
70 .sv_name = "FreeBSD ELF64",
71 .sv_coredump = __elfN(coredump),
72 .sv_imgact_try = NULL,
73 .sv_minsigstksz = MINSIGSTKSZ,
74 .sv_pagesize = PAGE_SIZE,
75 .sv_minuser = VM_MIN_ADDRESS,
76 .sv_maxuser = VM_MAXUSER_ADDRESS,
77 .sv_usrstack = USRSTACK,
78 .sv_psstrings = PS_STRINGS,
79 .sv_stackprot = VM_PROT_READ|VM_PROT_WRITE,
80 .sv_copyout_strings = exec_copyout_strings,
81 .sv_setregs = exec_setregs,
86 static Elf64_Brandinfo freebsd_brand_info = {
87 .brand = ELFOSABI_FREEBSD,
89 .compat_3_brand = "FreeBSD",
91 .interp_path = "/libexec/ld-elf.so.1",
92 .sysvec = &elf64_freebsd_sysvec,
93 .interp_newpath = NULL,
94 .brand_note = &elf64_freebsd_brandnote,
95 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
97 SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_ANY,
98 (sysinit_cfunc_t)elf64_insert_brand_entry, &freebsd_brand_info);
100 static Elf64_Brandinfo freebsd_brand_oinfo = {
101 .brand = ELFOSABI_FREEBSD,
103 .compat_3_brand = "FreeBSD",
105 .interp_path = "/usr/libexec/ld-elf.so.1",
106 .sysvec = &elf64_freebsd_sysvec,
107 .interp_newpath = NULL,
108 .brand_note = &elf64_freebsd_brandnote,
109 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
111 SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY,
112 (sysinit_cfunc_t)elf64_insert_brand_entry, &freebsd_brand_oinfo);
116 elf64_dump_thread(struct thread *td, void *dst, size_t *off __unused)
119 /* Flush the dirty registers onto the backingstore. */
121 ia64_flush_dirty(td, &td->td_frame->tf_special);
126 lookup_fdesc(linker_file_t lf, Elf_Size symidx, elf_lookup_fn lookup)
134 addr = lookup(lf, symidx, 0);
137 symname = elf_get_symname(top, symidx);
138 for (i = 0; i < top->ndeps; i++) {
140 addr = (Elf_Addr)linker_file_lookup_symbol(lf,
153 * Lookup and/or construct OPD
155 for (i = 0; i < 8192; i += 2) {
156 if (fptr_storage[i] == addr)
157 return (Elf_Addr)(fptr_storage + i);
159 if (fptr_storage[i] == 0) {
160 fptr_storage[i] = addr;
161 fptr_storage[i+1] = link_elf_get_gp(lf);
162 return (Elf_Addr)(fptr_storage + i);
166 printf("%s: fptr table full\n", __func__);
172 /* Process one elf relocation with addend. */
174 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
175 int type, int local, elf_lookup_fn lookup)
178 Elf_Addr addend, addr;
179 Elf_Size rtype, symidx;
181 const Elf_Rela *rela;
185 rel = (const Elf_Rel *)data;
186 where = (Elf_Addr *)(relocbase + rel->r_offset);
187 rtype = ELF_R_TYPE(rel->r_info);
188 symidx = ELF_R_SYM(rel->r_info);
190 case R_IA_64_DIR64LSB:
191 case R_IA_64_FPTR64LSB:
192 case R_IA_64_REL64LSB:
201 rela = (const Elf_Rela *)data;
202 where = (Elf_Addr *)(relocbase + rela->r_offset);
203 rtype = ELF_R_TYPE(rela->r_info);
204 symidx = ELF_R_SYM(rela->r_info);
205 addend = rela->r_addend;
208 panic("%s: invalid ELF relocation (0x%x)\n", __func__, type);
212 if (rtype == R_IA_64_REL64LSB)
213 *where = relocbase + addend;
220 case R_IA_64_DIR64LSB: /* word64 LSB S + A */
221 addr = lookup(lf, symidx, 1);
224 *where = addr + addend;
226 case R_IA_64_FPTR64LSB: /* word64 LSB @fptr(S + A) */
228 printf("%s: addend ignored for OPD relocation\n",
231 addr = lookup_fdesc(lf, symidx, lookup);
236 case R_IA_64_REL64LSB: /* word64 LSB BD + A */
238 case R_IA_64_IPLTLSB:
239 addr = lookup_fdesc(lf, symidx, lookup);
242 where[0] = *((Elf_Addr*)addr) + addend;
243 where[1] = *((Elf_Addr*)addr + 1);
246 printf("%s: unknown relocation (0x%x)\n", __func__,
255 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
256 elf_lookup_fn lookup)
259 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
263 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
264 int type, elf_lookup_fn lookup)
267 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
271 elf_cpu_load_file(linker_file_t lf)
274 Elf_Phdr *ph, *phlim;
275 Elf_Addr reloc, vaddr;
277 hdr = (Elf_Ehdr *)(lf->address);
279 printf("Missing or corrupted ELF header at %p\n", hdr);
284 * Iterate over the segments and register the unwind table if
287 ph = (Elf_Phdr *)(lf->address + hdr->e_phoff);
288 phlim = ph + hdr->e_phnum;
291 if (ph->p_type == PT_LOAD && reloc == ~0ULL)
292 reloc = (Elf_Addr)lf->address - ph->p_vaddr;
294 if (ph->p_type == PT_IA_64_UNWIND) {
295 vaddr = ph->p_vaddr + reloc;
296 unw_table_add((vm_offset_t)lf->address, vaddr,
297 vaddr + ph->p_memsz);
302 /* Invalidate the I-cache, but not for the kernel itself. */
304 ia64_invalidate_icache((uintptr_t)lf->address, lf->size);
310 elf_cpu_unload_file(linker_file_t lf)
313 unw_table_remove((vm_offset_t)lf->address);