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>
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 boolean_t elf32_arm_abi_supported(struct image_params *, int32_t *,
66 struct sysentvec elf32_freebsd_sysvec = {
67 .sv_size = SYS_MAXSYSCALL,
70 .sv_fixup = __elfN(freebsd_fixup),
71 .sv_sendsig = sendsig,
72 .sv_sigcode = sigcode,
73 .sv_szsigcode = &szsigcode,
74 .sv_name = "FreeBSD ELF32",
75 .sv_coredump = __elfN(coredump),
76 .sv_elf_core_osabi = ELFOSABI_FREEBSD,
77 .sv_elf_core_abi_vendor = FREEBSD_ABI_VENDOR,
78 .sv_elf_core_prepare_notes = __elfN(prepare_notes),
79 .sv_imgact_try = NULL,
80 .sv_minsigstksz = MINSIGSTKSZ,
81 .sv_minuser = VM_MIN_ADDRESS,
82 .sv_maxuser = VM_MAXUSER_ADDRESS,
83 .sv_usrstack = USRSTACK,
84 .sv_psstrings = PS_STRINGS,
85 .sv_psstringssz = sizeof(struct ps_strings),
86 .sv_stackprot = VM_PROT_ALL,
87 .sv_copyout_auxargs = __elfN(freebsd_copyout_auxargs),
88 .sv_copyout_strings = exec_copyout_strings,
89 .sv_setregs = exec_setregs,
93 SV_ASLR | SV_SHP | SV_TIMEKEEP | SV_RNG_SEED_VER |
94 SV_ABI_FREEBSD | SV_ILP32,
95 .sv_set_syscall_retval = cpu_set_syscall_retval,
96 .sv_fetch_syscall_args = cpu_fetch_syscall_args,
97 .sv_syscallnames = syscallnames,
98 .sv_shared_page_base = SHAREDPAGE,
99 .sv_shared_page_len = PAGE_SIZE,
100 .sv_schedtail = NULL,
101 .sv_thread_detach = NULL,
103 .sv_hwcap = &elf_hwcap,
104 .sv_hwcap2 = &elf_hwcap2,
105 .sv_onexec_old = exec_onexec_old,
106 .sv_onexit = exit_onexit,
107 .sv_regset_begin = SET_BEGIN(__elfN(regset)),
108 .sv_regset_end = SET_LIMIT(__elfN(regset)),
110 INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec);
112 static Elf32_Brandinfo freebsd_brand_info = {
113 .brand = ELFOSABI_FREEBSD,
115 .compat_3_brand = "FreeBSD",
117 .interp_path = "/libexec/ld-elf.so.1",
118 .sysvec = &elf32_freebsd_sysvec,
119 .interp_newpath = NULL,
120 .brand_note = &elf32_freebsd_brandnote,
121 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE,
122 .header_supported= elf32_arm_abi_supported,
125 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
126 (sysinit_cfunc_t) elf32_insert_brand_entry,
127 &freebsd_brand_info);
130 elf32_arm_abi_supported(struct image_params *imgp, int32_t *osrel __unused,
131 uint32_t *fctl0 __unused)
133 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header;
136 * When configured for EABI, FreeBSD supports EABI vesions 4 and 5.
138 if (EF_ARM_EABI_VERSION(hdr->e_flags) < EF_ARM_EABI_FREEBSD_MIN) {
140 uprintf("Attempting to execute non EABI binary (rev %d) image %s",
141 EF_ARM_EABI_VERSION(hdr->e_flags), imgp->args->fname);
148 elf32_dump_thread(struct thread *td __unused, void *dst __unused,
149 size_t *off __unused)
154 elf_is_ifunc_reloc(Elf_Size r_info __unused)
161 * It is possible for the compiler to emit relocations for unaligned data.
162 * We handle this situation with these inlines.
164 #define RELOC_ALIGNED_P(x) \
165 (((uintptr_t)(x) & (sizeof(void *) - 1)) == 0)
167 static __inline Elf_Addr
168 load_ptr(Elf_Addr *where)
172 if (RELOC_ALIGNED_P(where))
174 memcpy(&res, where, sizeof(res));
179 store_ptr(Elf_Addr *where, Elf_Addr val)
181 if (RELOC_ALIGNED_P(where))
184 memcpy(where, &val, sizeof(val));
186 #undef RELOC_ALIGNED_P
188 /* Process one elf relocation with addend. */
190 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
191 int type, int local, elf_lookup_fn lookup)
196 Elf_Word rtype, symidx;
198 const Elf_Rela *rela;
203 rel = (const Elf_Rel *)data;
204 where = (Elf_Addr *) (relocbase + rel->r_offset);
205 addend = load_ptr(where);
206 rtype = ELF_R_TYPE(rel->r_info);
207 symidx = ELF_R_SYM(rel->r_info);
210 rela = (const Elf_Rela *)data;
211 where = (Elf_Addr *) (relocbase + rela->r_offset);
212 addend = rela->r_addend;
213 rtype = ELF_R_TYPE(rela->r_info);
214 symidx = ELF_R_SYM(rela->r_info);
217 panic("unknown reloc type %d\n", type);
221 if (rtype == R_ARM_RELATIVE) { /* A + B */
222 addr = elf_relocaddr(lf, relocbase + addend);
223 if (load_ptr(where) != addr)
224 store_ptr(where, addr);
230 case R_ARM_NONE: /* none */
234 error = lookup(lf, symidx, 1, &addr);
237 store_ptr(where, addr + load_ptr(where));
240 case R_ARM_COPY: /* none */
242 * There shouldn't be copy relocations in kernel
245 printf("kldload: unexpected R_COPY relocation, "
246 "symbol index %d\n", symidx);
250 case R_ARM_JUMP_SLOT:
251 error = lookup(lf, symidx, 1, &addr);
253 store_ptr(where, addr);
261 printf("kldload: unexpected relocation type %d, "
262 "symbol index %d\n", rtype, symidx);
269 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
270 elf_lookup_fn lookup)
273 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
277 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
278 int type, elf_lookup_fn lookup)
281 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
285 elf_cpu_load_file(linker_file_t lf)
289 * The pmap code does not do an icache sync upon establishing executable
290 * mappings in the kernel pmap. It's an optimization based on the fact
291 * that kernel memory allocations always have EXECUTABLE protection even
292 * when the memory isn't going to hold executable code. The only time
293 * kernel memory holding instructions does need a sync is after loading
294 * a kernel module, and that's when this function gets called.
296 * This syncs data and instruction caches after loading a module. We
297 * don't worry about the kernel itself (lf->id is 1) as locore.S did
298 * that on entry. Even if data cache maintenance was done by IO code,
299 * the relocation fixup process creates dirty cache entries that we must
300 * write back before doing icache sync. The instruction cache sync also
301 * invalidates the branch predictor cache on platforms that have one.
305 dcache_wb_pou((vm_offset_t)lf->address, (vm_size_t)lf->size);
308 #if defined(DDB) || defined(KDTRACE_HOOKS) || defined(STACK)
310 * Inform the stack(9) code of the new module, so it can acquire its
311 * per-module unwind data.
313 unwind_module_loaded(lf);
320 elf_cpu_parse_dynamic(caddr_t loadbase __unused, Elf_Dyn *dynamic __unused)
327 elf_cpu_unload_file(linker_file_t lf)
330 #if defined(DDB) || defined(KDTRACE_HOOKS) || defined(STACK)
331 /* Inform the stack(9) code that this module is gone. */
332 unwind_module_unloaded(lf);