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.
26 #include <sys/cdefs.h>
27 __FBSDID("$FreeBSD$");
29 #include <sys/param.h>
30 #include <sys/kernel.h>
31 #include <sys/systm.h>
33 #include <sys/imgact.h>
34 #include <sys/linker.h>
35 #include <sys/sysent.h>
36 #include <sys/imgact_elf.h>
38 #include <sys/syscall.h>
39 #include <sys/signalvar.h>
40 #include <sys/vnode.h>
44 #include <vm/vm_param.h>
46 #include <machine/elf.h>
47 #include <machine/md_var.h>
49 static boolean_t elf32_arm_abi_supported(struct image_params *);
51 struct sysentvec elf32_freebsd_sysvec = {
52 .sv_size = SYS_MAXSYSCALL,
60 .sv_fixup = __elfN(freebsd_fixup),
61 .sv_sendsig = sendsig,
62 .sv_sigcode = sigcode,
63 .sv_szsigcode = &szsigcode,
64 .sv_prepsyscall = NULL,
65 .sv_name = "FreeBSD ELF32",
66 .sv_coredump = __elfN(coredump),
67 .sv_imgact_try = NULL,
68 .sv_minsigstksz = MINSIGSTKSZ,
69 .sv_pagesize = PAGE_SIZE,
70 .sv_minuser = VM_MIN_ADDRESS,
71 .sv_maxuser = VM_MAXUSER_ADDRESS,
72 .sv_usrstack = USRSTACK,
73 .sv_psstrings = PS_STRINGS,
74 .sv_stackprot = VM_PROT_ALL,
75 .sv_copyout_strings = exec_copyout_strings,
76 .sv_setregs = exec_setregs,
79 .sv_flags = SV_ABI_FREEBSD | SV_ILP32,
80 .sv_set_syscall_retval = cpu_set_syscall_retval,
81 .sv_fetch_syscall_args = cpu_fetch_syscall_args,
82 .sv_syscallnames = syscallnames,
84 .sv_thread_detach = NULL,
87 static Elf32_Brandinfo freebsd_brand_info = {
88 .brand = ELFOSABI_FREEBSD,
90 .compat_3_brand = "FreeBSD",
92 .interp_path = "/libexec/ld-elf.so.1",
93 .sysvec = &elf32_freebsd_sysvec,
94 .interp_newpath = NULL,
95 .brand_note = &elf32_freebsd_brandnote,
96 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE,
97 .header_supported= elf32_arm_abi_supported,
100 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
101 (sysinit_cfunc_t) elf32_insert_brand_entry,
102 &freebsd_brand_info);
105 elf32_arm_abi_supported(struct image_params *imgp)
107 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header;
110 * When configured for EABI, FreeBSD supports EABI vesions 4 and 5.
112 if (EF_ARM_EABI_VERSION(hdr->e_flags) < EF_ARM_EABI_FREEBSD_MIN) {
114 uprintf("Attempting to execute non EABI binary (rev %d) image %s",
115 EF_ARM_EABI_VERSION(hdr->e_flags), imgp->args->fname);
122 elf32_dump_thread(struct thread *td __unused, void *dst __unused,
123 size_t *off __unused)
128 * It is possible for the compiler to emit relocations for unaligned data.
129 * We handle this situation with these inlines.
131 #define RELOC_ALIGNED_P(x) \
132 (((uintptr_t)(x) & (sizeof(void *) - 1)) == 0)
134 static __inline Elf_Addr
135 load_ptr(Elf_Addr *where)
139 if (RELOC_ALIGNED_P(where))
141 memcpy(&res, where, sizeof(res));
146 store_ptr(Elf_Addr *where, Elf_Addr val)
148 if (RELOC_ALIGNED_P(where))
151 memcpy(where, &val, sizeof(val));
153 #undef RELOC_ALIGNED_P
156 /* Process one elf relocation with addend. */
158 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
159 int type, int local, elf_lookup_fn lookup)
164 Elf_Word rtype, symidx;
166 const Elf_Rela *rela;
171 rel = (const Elf_Rel *)data;
172 where = (Elf_Addr *) (relocbase + rel->r_offset);
173 addend = load_ptr(where);
174 rtype = ELF_R_TYPE(rel->r_info);
175 symidx = ELF_R_SYM(rel->r_info);
178 rela = (const Elf_Rela *)data;
179 where = (Elf_Addr *) (relocbase + rela->r_offset);
180 addend = rela->r_addend;
181 rtype = ELF_R_TYPE(rela->r_info);
182 symidx = ELF_R_SYM(rela->r_info);
185 panic("unknown reloc type %d\n", type);
189 if (rtype == R_ARM_RELATIVE) { /* A + B */
190 addr = elf_relocaddr(lf, relocbase + addend);
191 if (load_ptr(where) != addr)
192 store_ptr(where, addr);
199 case R_ARM_NONE: /* none */
203 error = lookup(lf, symidx, 1, &addr);
206 store_ptr(where, addr + load_ptr(where));
209 case R_ARM_COPY: /* none */
211 * There shouldn't be copy relocations in kernel
214 printf("kldload: unexpected R_COPY relocation\n");
218 case R_ARM_JUMP_SLOT:
219 error = lookup(lf, symidx, 1, &addr);
221 store_ptr(where, addr);
229 printf("kldload: unexpected relocation type %d\n",
237 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
238 elf_lookup_fn lookup)
241 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
245 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
246 int type, elf_lookup_fn lookup)
249 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
253 elf_cpu_load_file(linker_file_t lf __unused)
257 * The pmap code does not do an icache sync upon establishing executable
258 * mappings in the kernel pmap. It's an optimization based on the fact
259 * that kernel memory allocations always have EXECUTABLE protection even
260 * when the memory isn't going to hold executable code. The only time
261 * kernel memory holding instructions does need a sync is after loading
262 * a kernel module, and that's when this function gets called. Normal
263 * data cache maintenance has already been done by the IO code, and TLB
264 * maintenance has been done by the pmap code, so all we have to do here
265 * is invalidate the instruction cache (which also invalidates the
266 * branch predictor cache on platforms that have one).
268 cpu_icache_sync_all();
273 elf_cpu_unload_file(linker_file_t lf __unused)