2 * SPDX-License-Identifier: BSD-2-Clause
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>
38 #include <sys/sysent.h>
39 #include <sys/imgact_elf.h>
41 #include <sys/syscall.h>
42 #include <sys/signalvar.h>
43 #include <sys/vnode.h>
47 #include <vm/vm_param.h>
49 #include <machine/elf.h>
50 #include <machine/md_var.h>
51 #include <machine/stack.h>
53 #include <machine/vfp.h>
56 #include "opt_ddb.h" /* for OPT_DDB */
57 #include "opt_global.h" /* for OPT_KDTRACE_HOOKS */
58 #include "opt_stack.h" /* for OPT_STACK */
60 static bool elf32_arm_abi_supported(struct image_params *, int32_t *,
66 struct sysentvec elf32_freebsd_sysvec = {
67 .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_minsigstksz = MINSIGSTKSZ,
79 .sv_minuser = VM_MIN_ADDRESS,
80 .sv_maxuser = VM_MAXUSER_ADDRESS,
81 .sv_usrstack = USRSTACK,
82 .sv_psstrings = PS_STRINGS,
83 .sv_psstringssz = sizeof(struct 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,
105 .sv_regset_begin = SET_BEGIN(__elfN(regset)),
106 .sv_regset_end = SET_LIMIT(__elfN(regset)),
108 INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec);
110 static Elf32_Brandinfo freebsd_brand_info = {
111 .brand = ELFOSABI_FREEBSD,
113 .compat_3_brand = "FreeBSD",
114 .interp_path = "/libexec/ld-elf.so.1",
115 .sysvec = &elf32_freebsd_sysvec,
116 .interp_newpath = NULL,
117 .brand_note = &elf32_freebsd_brandnote,
118 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE,
119 .header_supported= elf32_arm_abi_supported,
122 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
123 (sysinit_cfunc_t) elf32_insert_brand_entry,
124 &freebsd_brand_info);
127 elf32_arm_abi_supported(struct image_params *imgp, int32_t *osrel __unused,
128 uint32_t *fctl0 __unused)
130 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header;
133 * When configured for EABI, FreeBSD supports EABI vesions 4 and 5.
135 if (EF_ARM_EABI_VERSION(hdr->e_flags) < EF_ARM_EABI_FREEBSD_MIN) {
137 uprintf("Attempting to execute non EABI binary (rev %d) image %s",
138 EF_ARM_EABI_VERSION(hdr->e_flags), imgp->args->fname);
145 elf32_dump_thread(struct thread *td __unused, void *dst __unused,
146 size_t *off __unused)
151 elf_is_ifunc_reloc(Elf_Size r_info __unused)
158 * It is possible for the compiler to emit relocations for unaligned data.
159 * We handle this situation with these inlines.
161 #define RELOC_ALIGNED_P(x) \
162 (((uintptr_t)(x) & (sizeof(void *) - 1)) == 0)
164 static __inline Elf_Addr
165 load_ptr(Elf_Addr *where)
169 if (RELOC_ALIGNED_P(where))
171 memcpy(&res, where, sizeof(res));
176 store_ptr(Elf_Addr *where, Elf_Addr val)
178 if (RELOC_ALIGNED_P(where))
181 memcpy(where, &val, sizeof(val));
183 #undef RELOC_ALIGNED_P
185 /* Process one elf relocation with addend. */
187 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
188 int type, int local, elf_lookup_fn lookup)
193 Elf_Word rtype, symidx;
195 const Elf_Rela *rela;
200 rel = (const Elf_Rel *)data;
201 where = (Elf_Addr *) (relocbase + rel->r_offset);
202 addend = load_ptr(where);
203 rtype = ELF_R_TYPE(rel->r_info);
204 symidx = ELF_R_SYM(rel->r_info);
207 rela = (const Elf_Rela *)data;
208 where = (Elf_Addr *) (relocbase + rela->r_offset);
209 addend = rela->r_addend;
210 rtype = ELF_R_TYPE(rela->r_info);
211 symidx = ELF_R_SYM(rela->r_info);
214 panic("unknown reloc type %d\n", type);
218 if (rtype == R_ARM_RELATIVE) { /* A + B */
219 addr = elf_relocaddr(lf, relocbase + addend);
220 if (load_ptr(where) != addr)
221 store_ptr(where, addr);
227 case R_ARM_NONE: /* none */
231 error = lookup(lf, symidx, 1, &addr);
234 store_ptr(where, addr + load_ptr(where));
237 case R_ARM_COPY: /* none */
239 * There shouldn't be copy relocations in kernel
242 printf("kldload: unexpected R_COPY relocation, "
243 "symbol index %d\n", symidx);
247 case R_ARM_JUMP_SLOT:
248 error = lookup(lf, symidx, 1, &addr);
250 store_ptr(where, addr);
258 printf("kldload: unexpected relocation type %d, "
259 "symbol index %d\n", rtype, symidx);
266 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
267 elf_lookup_fn lookup)
270 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
274 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
275 int type, elf_lookup_fn lookup)
278 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
282 elf_cpu_load_file(linker_file_t lf)
286 * The pmap code does not do an icache sync upon establishing executable
287 * mappings in the kernel pmap. It's an optimization based on the fact
288 * that kernel memory allocations always have EXECUTABLE protection even
289 * when the memory isn't going to hold executable code. The only time
290 * kernel memory holding instructions does need a sync is after loading
291 * a kernel module, and that's when this function gets called.
293 * This syncs data and instruction caches after loading a module. We
294 * don't worry about the kernel itself (lf->id is 1) as locore.S did
295 * that on entry. Even if data cache maintenance was done by IO code,
296 * the relocation fixup process creates dirty cache entries that we must
297 * write back before doing icache sync. The instruction cache sync also
298 * invalidates the branch predictor cache on platforms that have one.
302 dcache_wb_pou((vm_offset_t)lf->address, (vm_size_t)lf->size);
305 #if defined(DDB) || defined(KDTRACE_HOOKS) || defined(STACK)
307 * Inform the stack(9) code of the new module, so it can acquire its
308 * per-module unwind data.
310 unwind_module_loaded(lf);
317 elf_cpu_parse_dynamic(caddr_t loadbase __unused, Elf_Dyn *dynamic __unused)
324 elf_cpu_unload_file(linker_file_t lf)
327 #if defined(DDB) || defined(KDTRACE_HOOKS) || defined(STACK)
328 /* Inform the stack(9) code that this module is gone. */
329 unwind_module_unloaded(lf);