2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright 1996-1998 John D. Polstra.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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/stack.h>
52 #include <machine/vfp.h>
55 #include "opt_ddb.h" /* for OPT_DDB */
56 #include "opt_global.h" /* for OPT_KDTRACE_HOOKS */
57 #include "opt_stack.h" /* for OPT_STACK */
59 static boolean_t elf32_arm_abi_supported(struct image_params *, int32_t *,
65 struct sysentvec elf32_freebsd_sysvec = {
66 .sv_size = SYS_MAXSYSCALL,
69 .sv_fixup = __elfN(freebsd_fixup),
70 .sv_sendsig = sendsig,
71 .sv_sigcode = sigcode,
72 .sv_szsigcode = &szsigcode,
73 .sv_name = "FreeBSD ELF32",
74 .sv_coredump = __elfN(coredump),
75 .sv_elf_core_osabi = ELFOSABI_FREEBSD,
76 .sv_elf_core_abi_vendor = FREEBSD_ABI_VENDOR,
77 .sv_elf_core_prepare_notes = __elfN(prepare_notes),
78 .sv_imgact_try = NULL,
79 .sv_minsigstksz = MINSIGSTKSZ,
80 .sv_minuser = VM_MIN_ADDRESS,
81 .sv_maxuser = VM_MAXUSER_ADDRESS,
82 .sv_usrstack = USRSTACK,
83 .sv_psstrings = PS_STRINGS,
84 .sv_stackprot = VM_PROT_ALL,
85 .sv_copyout_auxargs = __elfN(freebsd_copyout_auxargs),
86 .sv_copyout_strings = exec_copyout_strings,
87 .sv_setregs = exec_setregs,
91 SV_ASLR | SV_SHP | SV_TIMEKEEP | SV_RNG_SEED_VER |
92 SV_ABI_FREEBSD | SV_ILP32,
93 .sv_set_syscall_retval = cpu_set_syscall_retval,
94 .sv_fetch_syscall_args = cpu_fetch_syscall_args,
95 .sv_syscallnames = syscallnames,
96 .sv_shared_page_base = SHAREDPAGE,
97 .sv_shared_page_len = PAGE_SIZE,
99 .sv_thread_detach = NULL,
101 .sv_hwcap = &elf_hwcap,
102 .sv_hwcap2 = &elf_hwcap2,
103 .sv_onexec_old = exec_onexec_old,
104 .sv_onexit = exit_onexit,
106 INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec);
108 static Elf32_Brandinfo freebsd_brand_info = {
109 .brand = ELFOSABI_FREEBSD,
111 .compat_3_brand = "FreeBSD",
113 .interp_path = "/libexec/ld-elf.so.1",
114 .sysvec = &elf32_freebsd_sysvec,
115 .interp_newpath = NULL,
116 .brand_note = &elf32_freebsd_brandnote,
117 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE,
118 .header_supported= elf32_arm_abi_supported,
121 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
122 (sysinit_cfunc_t) elf32_insert_brand_entry,
123 &freebsd_brand_info);
126 elf32_arm_abi_supported(struct image_params *imgp, int32_t *osrel __unused,
127 uint32_t *fctl0 __unused)
129 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header;
132 * When configured for EABI, FreeBSD supports EABI vesions 4 and 5.
134 if (EF_ARM_EABI_VERSION(hdr->e_flags) < EF_ARM_EABI_FREEBSD_MIN) {
136 uprintf("Attempting to execute non EABI binary (rev %d) image %s",
137 EF_ARM_EABI_VERSION(hdr->e_flags), imgp->args->fname);
144 elf32_dump_thread(struct thread *td, void *dst, size_t *off)
150 get_vfpcontext(td, &vfp);
151 *off = elf32_populate_note(NT_ARM_VFP, &vfp, dst, sizeof(vfp),
154 *off = elf32_populate_note(NT_ARM_VFP, NULL, NULL, sizeof(vfp),
160 elf_is_ifunc_reloc(Elf_Size r_info __unused)
167 * It is possible for the compiler to emit relocations for unaligned data.
168 * We handle this situation with these inlines.
170 #define RELOC_ALIGNED_P(x) \
171 (((uintptr_t)(x) & (sizeof(void *) - 1)) == 0)
173 static __inline Elf_Addr
174 load_ptr(Elf_Addr *where)
178 if (RELOC_ALIGNED_P(where))
180 memcpy(&res, where, sizeof(res));
185 store_ptr(Elf_Addr *where, Elf_Addr val)
187 if (RELOC_ALIGNED_P(where))
190 memcpy(where, &val, sizeof(val));
192 #undef RELOC_ALIGNED_P
194 /* Process one elf relocation with addend. */
196 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
197 int type, int local, elf_lookup_fn lookup)
202 Elf_Word rtype, symidx;
204 const Elf_Rela *rela;
209 rel = (const Elf_Rel *)data;
210 where = (Elf_Addr *) (relocbase + rel->r_offset);
211 addend = load_ptr(where);
212 rtype = ELF_R_TYPE(rel->r_info);
213 symidx = ELF_R_SYM(rel->r_info);
216 rela = (const Elf_Rela *)data;
217 where = (Elf_Addr *) (relocbase + rela->r_offset);
218 addend = rela->r_addend;
219 rtype = ELF_R_TYPE(rela->r_info);
220 symidx = ELF_R_SYM(rela->r_info);
223 panic("unknown reloc type %d\n", type);
227 if (rtype == R_ARM_RELATIVE) { /* A + B */
228 addr = elf_relocaddr(lf, relocbase + addend);
229 if (load_ptr(where) != addr)
230 store_ptr(where, addr);
236 case R_ARM_NONE: /* none */
240 error = lookup(lf, symidx, 1, &addr);
243 store_ptr(where, addr + load_ptr(where));
246 case R_ARM_COPY: /* none */
248 * There shouldn't be copy relocations in kernel
251 printf("kldload: unexpected R_COPY relocation, "
252 "symbol index %d\n", symidx);
256 case R_ARM_JUMP_SLOT:
257 error = lookup(lf, symidx, 1, &addr);
259 store_ptr(where, addr);
267 printf("kldload: unexpected relocation type %d, "
268 "symbol index %d\n", rtype, symidx);
275 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
276 elf_lookup_fn lookup)
279 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
283 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
284 int type, elf_lookup_fn lookup)
287 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
291 elf_cpu_load_file(linker_file_t lf)
295 * The pmap code does not do an icache sync upon establishing executable
296 * mappings in the kernel pmap. It's an optimization based on the fact
297 * that kernel memory allocations always have EXECUTABLE protection even
298 * when the memory isn't going to hold executable code. The only time
299 * kernel memory holding instructions does need a sync is after loading
300 * a kernel module, and that's when this function gets called.
302 * This syncs data and instruction caches after loading a module. We
303 * don't worry about the kernel itself (lf->id is 1) as locore.S did
304 * that on entry. Even if data cache maintenance was done by IO code,
305 * the relocation fixup process creates dirty cache entries that we must
306 * write back before doing icache sync. The instruction cache sync also
307 * invalidates the branch predictor cache on platforms that have one.
311 dcache_wb_pou((vm_offset_t)lf->address, (vm_size_t)lf->size);
314 #if defined(DDB) || defined(KDTRACE_HOOKS) || defined(STACK)
316 * Inform the stack(9) code of the new module, so it can acquire its
317 * per-module unwind data.
319 unwind_module_loaded(lf);
326 elf_cpu_parse_dynamic(caddr_t loadbase __unused, Elf_Dyn *dynamic __unused)
333 elf_cpu_unload_file(linker_file_t lf)
336 #if defined(DDB) || defined(KDTRACE_HOOKS) || defined(STACK)
337 /* Inform the stack(9) code that this module is gone. */
338 unwind_module_unloaded(lf);