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,
86 static Elf32_Brandinfo freebsd_brand_info = {
87 .brand = ELFOSABI_FREEBSD,
89 .compat_3_brand = "FreeBSD",
91 .interp_path = "/libexec/ld-elf.so.1",
92 .sysvec = &elf32_freebsd_sysvec,
93 .interp_newpath = NULL,
94 .brand_note = &elf32_freebsd_brandnote,
95 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE,
96 .header_supported= elf32_arm_abi_supported,
99 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
100 (sysinit_cfunc_t) elf32_insert_brand_entry,
101 &freebsd_brand_info);
104 elf32_arm_abi_supported(struct image_params *imgp)
106 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header;
109 * When configured for EABI, FreeBSD supports EABI vesions 4 and 5.
111 if (EF_ARM_EABI_VERSION(hdr->e_flags) < EF_ARM_EABI_FREEBSD_MIN) {
113 uprintf("Attempting to execute non EABI binary (rev %d) image %s",
114 EF_ARM_EABI_VERSION(hdr->e_flags), imgp->args->fname);
121 elf32_dump_thread(struct thread *td __unused, void *dst __unused,
122 size_t *off __unused)
127 * It is possible for the compiler to emit relocations for unaligned data.
128 * We handle this situation with these inlines.
130 #define RELOC_ALIGNED_P(x) \
131 (((uintptr_t)(x) & (sizeof(void *) - 1)) == 0)
133 static __inline Elf_Addr
134 load_ptr(Elf_Addr *where)
138 if (RELOC_ALIGNED_P(where))
140 memcpy(&res, where, sizeof(res));
145 store_ptr(Elf_Addr *where, Elf_Addr val)
147 if (RELOC_ALIGNED_P(where))
150 memcpy(where, &val, sizeof(val));
152 #undef RELOC_ALIGNED_P
155 /* Process one elf relocation with addend. */
157 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
158 int type, int local, elf_lookup_fn lookup)
163 Elf_Word rtype, symidx;
165 const Elf_Rela *rela;
169 rel = (const Elf_Rel *)data;
170 where = (Elf_Addr *) (relocbase + rel->r_offset);
171 addend = load_ptr(where);
172 rtype = ELF_R_TYPE(rel->r_info);
173 symidx = ELF_R_SYM(rel->r_info);
176 rela = (const Elf_Rela *)data;
177 where = (Elf_Addr *) (relocbase + rela->r_offset);
178 addend = rela->r_addend;
179 rtype = ELF_R_TYPE(rela->r_info);
180 symidx = ELF_R_SYM(rela->r_info);
183 panic("unknown reloc type %d\n", type);
187 if (rtype == R_ARM_RELATIVE) { /* A + B */
188 addr = elf_relocaddr(lf, relocbase + addend);
189 if (load_ptr(where) != addr)
190 store_ptr(where, addr);
197 case R_ARM_NONE: /* none */
201 addr = lookup(lf, symidx, 1);
204 store_ptr(where, addr + load_ptr(where));
207 case R_ARM_COPY: /* none */
209 * There shouldn't be copy relocations in kernel
212 printf("kldload: unexpected R_COPY relocation\n");
216 case R_ARM_JUMP_SLOT:
217 addr = lookup(lf, symidx, 1);
219 store_ptr(where, addr);
227 printf("kldload: unexpected relocation type %d\n",
235 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
236 elf_lookup_fn lookup)
239 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
243 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
244 int type, elf_lookup_fn lookup)
247 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
251 elf_cpu_load_file(linker_file_t lf __unused)
255 * The pmap code does not do an icache sync upon establishing executable
256 * mappings in the kernel pmap. It's an optimization based on the fact
257 * that kernel memory allocations always have EXECUTABLE protection even
258 * when the memory isn't going to hold executable code. The only time
259 * kernel memory holding instructions does need a sync is after loading
260 * a kernel module, and that's when this function gets called. Normal
261 * data cache maintenance has already been done by the IO code, and TLB
262 * maintenance has been done by the pmap code, so all we have to do here
263 * is invalidate the instruction cache (which also invalidates the
264 * branch predictor cache on platforms that have one).
266 cpu_icache_sync_all();
271 elf_cpu_unload_file(linker_file_t lf __unused)