1033f58dfSPeter Wemm /*-
24d846d26SWarner Losh * SPDX-License-Identifier: BSD-2-Clause
383ef78beSPedro F. Giffuni *
4033f58dfSPeter Wemm * Copyright 1996-1998 John D. Polstra.
5033f58dfSPeter Wemm * All rights reserved.
6033f58dfSPeter Wemm *
7033f58dfSPeter Wemm * Redistribution and use in source and binary forms, with or without
8033f58dfSPeter Wemm * modification, are permitted provided that the following conditions
9033f58dfSPeter Wemm * are met:
10033f58dfSPeter Wemm * 1. Redistributions of source code must retain the above copyright
11033f58dfSPeter Wemm * notice, this list of conditions and the following disclaimer.
12033f58dfSPeter Wemm * 2. Redistributions in binary form must reproduce the above copyright
13033f58dfSPeter Wemm * notice, this list of conditions and the following disclaimer in the
14033f58dfSPeter Wemm * documentation and/or other materials provided with the distribution.
15033f58dfSPeter Wemm *
16033f58dfSPeter Wemm * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17033f58dfSPeter Wemm * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18033f58dfSPeter Wemm * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19033f58dfSPeter Wemm * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20033f58dfSPeter Wemm * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21033f58dfSPeter Wemm * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22033f58dfSPeter Wemm * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23033f58dfSPeter Wemm * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24033f58dfSPeter Wemm * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25033f58dfSPeter Wemm * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26033f58dfSPeter Wemm */
27033f58dfSPeter Wemm
289676a785SDavid E. O'Brien #include <sys/cdefs.h>
296d2950a8SWarner Losh #include "opt_cpu.h"
306d2950a8SWarner Losh
31033f58dfSPeter Wemm #include <sys/param.h>
323ebc1248SPeter Wemm #include <sys/kernel.h>
33033f58dfSPeter Wemm #include <sys/systm.h>
34f36ba452SJake Burkholder #include <sys/exec.h>
35f36ba452SJake Burkholder #include <sys/imgact.h>
36033f58dfSPeter Wemm #include <sys/linker.h>
37548a2ec4SAndrew Turner #include <sys/reg.h>
38afe1a688SKonstantin Belousov #include <sys/proc.h>
393ebc1248SPeter Wemm #include <sys/sysent.h>
403ebc1248SPeter Wemm #include <sys/imgact_elf.h>
413ebc1248SPeter Wemm #include <sys/syscall.h>
423ebc1248SPeter Wemm #include <sys/signalvar.h>
433ebc1248SPeter Wemm #include <sys/vnode.h>
44f36ba452SJake Burkholder
45f36ba452SJake Burkholder #include <vm/vm.h>
46f36ba452SJake Burkholder #include <vm/pmap.h>
47f36ba452SJake Burkholder #include <vm/vm_param.h>
48f36ba452SJake Burkholder
49033f58dfSPeter Wemm #include <machine/elf.h>
503ebc1248SPeter Wemm #include <machine/md_var.h>
51180e57e5SJohn Baldwin #include <machine/npx.h>
523ebc1248SPeter Wemm
533ebc1248SPeter Wemm struct sysentvec elf32_freebsd_sysvec = {
54a8d403e1SKonstantin Belousov .sv_size = SYS_MAXSYSCALL,
55a8d403e1SKonstantin Belousov .sv_table = sysent,
56a8d403e1SKonstantin Belousov .sv_fixup = __elfN(freebsd_fixup),
57a8d403e1SKonstantin Belousov .sv_sendsig = sendsig,
58a8d403e1SKonstantin Belousov .sv_sigcode = sigcode,
59a8d403e1SKonstantin Belousov .sv_szsigcode = &szsigcode,
60a8d403e1SKonstantin Belousov .sv_name = "FreeBSD ELF32",
61a8d403e1SKonstantin Belousov .sv_coredump = __elfN(coredump),
62435754a5SEdward Tomasz Napierala .sv_elf_core_osabi = ELFOSABI_FREEBSD,
63435754a5SEdward Tomasz Napierala .sv_elf_core_abi_vendor = FREEBSD_ABI_VENDOR,
64435754a5SEdward Tomasz Napierala .sv_elf_core_prepare_notes = __elfN(prepare_notes),
65a8d403e1SKonstantin Belousov .sv_minsigstksz = MINSIGSTKSZ,
66a8d403e1SKonstantin Belousov .sv_minuser = VM_MIN_ADDRESS,
67a8d403e1SKonstantin Belousov .sv_maxuser = VM_MAXUSER_ADDRESS,
68a8d403e1SKonstantin Belousov .sv_usrstack = USRSTACK,
69a8d403e1SKonstantin Belousov .sv_psstrings = PS_STRINGS,
703fc21fddSMark Johnston .sv_psstringssz = sizeof(struct ps_strings),
71a8d403e1SKonstantin Belousov .sv_stackprot = VM_PROT_ALL,
72e3532331SJohn Baldwin .sv_copyout_auxargs = __elfN(freebsd_copyout_auxargs),
73a8d403e1SKonstantin Belousov .sv_copyout_strings = exec_copyout_strings,
74a8d403e1SKonstantin Belousov .sv_setregs = exec_setregs,
75a8d403e1SKonstantin Belousov .sv_fixlimit = NULL,
76b4cf0e62SKonstantin Belousov .sv_maxssiz = NULL,
77fa50a355SKonstantin Belousov .sv_flags = SV_ABI_FREEBSD | SV_ASLR | SV_IA32 | SV_ILP32 |
78b82b4ae7SKonstantin Belousov SV_SHP | SV_TIMEKEEP | SV_RNG_SEED_VER | SV_SIGSYS,
79afe1a688SKonstantin Belousov .sv_set_syscall_retval = cpu_set_syscall_retval,
80afe1a688SKonstantin Belousov .sv_fetch_syscall_args = cpu_fetch_syscall_args,
81afe1a688SKonstantin Belousov .sv_syscallnames = syscallnames,
82d69ae412SKonstantin Belousov .sv_shared_page_base = SHAREDPAGE,
83d69ae412SKonstantin Belousov .sv_shared_page_len = PAGE_SIZE,
84e5d81ef1SDmitry Chagin .sv_schedtail = NULL,
8591d1786fSDmitry Chagin .sv_thread_detach = NULL,
86038c7205SDmitry Chagin .sv_trap = NULL,
8728a66fc3SKonstantin Belousov .sv_onexec_old = exec_onexec_old,
8828a66fc3SKonstantin Belousov .sv_onexit = exit_onexit,
89de8374dfSDmitry Chagin .sv_set_fork_retval = x86_set_fork_retval,
90548a2ec4SAndrew Turner .sv_regset_begin = SET_BEGIN(__elfN(regset)),
91548a2ec4SAndrew Turner .sv_regset_end = SET_LIMIT(__elfN(regset)),
923ebc1248SPeter Wemm };
93d69ae412SKonstantin Belousov INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec);
943ebc1248SPeter Wemm
953ebc1248SPeter Wemm static Elf32_Brandinfo freebsd_brand_info = {
96a8d403e1SKonstantin Belousov .brand = ELFOSABI_FREEBSD,
97a8d403e1SKonstantin Belousov .machine = EM_386,
98a8d403e1SKonstantin Belousov .compat_3_brand = "FreeBSD",
99a8d403e1SKonstantin Belousov .interp_path = "/libexec/ld-elf.so.1",
100a8d403e1SKonstantin Belousov .sysvec = &elf32_freebsd_sysvec,
101a8d403e1SKonstantin Belousov .interp_newpath = NULL,
10232c01de2SDmitry Chagin .brand_note = &elf32_freebsd_brandnote,
103cd899aadSDmitry Chagin .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
1043ebc1248SPeter Wemm };
1053ebc1248SPeter Wemm
10652bf2041SBjoern A. Zeeb SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
1073ebc1248SPeter Wemm (sysinit_cfunc_t) elf32_insert_brand_entry,
1083ebc1248SPeter Wemm &freebsd_brand_info);
109033f58dfSPeter Wemm
1109b68618dSPeter Wemm static Elf32_Brandinfo freebsd_brand_oinfo = {
111a8d403e1SKonstantin Belousov .brand = ELFOSABI_FREEBSD,
112a8d403e1SKonstantin Belousov .machine = EM_386,
113a8d403e1SKonstantin Belousov .compat_3_brand = "FreeBSD",
114a8d403e1SKonstantin Belousov .interp_path = "/usr/libexec/ld-elf.so.1",
115a8d403e1SKonstantin Belousov .sysvec = &elf32_freebsd_sysvec,
116a8d403e1SKonstantin Belousov .interp_newpath = NULL,
11732c01de2SDmitry Chagin .brand_note = &elf32_freebsd_brandnote,
118cd899aadSDmitry Chagin .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
1199b68618dSPeter Wemm };
1209b68618dSPeter Wemm
1219b68618dSPeter Wemm SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
1229b68618dSPeter Wemm (sysinit_cfunc_t) elf32_insert_brand_entry,
1239b68618dSPeter Wemm &freebsd_brand_oinfo);
1249b68618dSPeter Wemm
12589ffc202SBjoern A. Zeeb static Elf32_Brandinfo kfreebsd_brand_info = {
12689ffc202SBjoern A. Zeeb .brand = ELFOSABI_FREEBSD,
12789ffc202SBjoern A. Zeeb .machine = EM_386,
12889ffc202SBjoern A. Zeeb .compat_3_brand = "FreeBSD",
12989ffc202SBjoern A. Zeeb .interp_path = "/lib/ld.so.1",
13089ffc202SBjoern A. Zeeb .sysvec = &elf32_freebsd_sysvec,
13189ffc202SBjoern A. Zeeb .interp_newpath = NULL,
13289ffc202SBjoern A. Zeeb .brand_note = &elf32_kfreebsd_brandnote,
133ecc2fda8SBjoern A. Zeeb .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY
13489ffc202SBjoern A. Zeeb };
13589ffc202SBjoern A. Zeeb
13689ffc202SBjoern A. Zeeb SYSINIT(kelf32, SI_SUB_EXEC, SI_ORDER_ANY,
13789ffc202SBjoern A. Zeeb (sysinit_cfunc_t) elf32_insert_brand_entry,
13889ffc202SBjoern A. Zeeb &kfreebsd_brand_info);
13989ffc202SBjoern A. Zeeb
1404da47b2fSMarcel Moolenaar void
elf32_dump_thread(struct thread * td,void * dst,size_t * off)141180e57e5SJohn Baldwin elf32_dump_thread(struct thread *td, void *dst, size_t *off)
1424da47b2fSMarcel Moolenaar {
143180e57e5SJohn Baldwin void *buf;
144180e57e5SJohn Baldwin size_t len;
1454da47b2fSMarcel Moolenaar
146180e57e5SJohn Baldwin len = 0;
147180e57e5SJohn Baldwin if (use_xsave) {
148180e57e5SJohn Baldwin if (dst != NULL) {
149180e57e5SJohn Baldwin npxgetregs(td);
150180e57e5SJohn Baldwin len += elf32_populate_note(NT_X86_XSTATE,
151180e57e5SJohn Baldwin get_pcb_user_save_td(td), dst,
152180e57e5SJohn Baldwin cpu_max_ext_state_size, &buf);
153180e57e5SJohn Baldwin *(uint64_t *)((char *)buf + X86_XSTATE_XCR0_OFFSET) =
154180e57e5SJohn Baldwin xsave_mask;
155180e57e5SJohn Baldwin } else
156180e57e5SJohn Baldwin len += elf32_populate_note(NT_X86_XSTATE, NULL, NULL,
157180e57e5SJohn Baldwin cpu_max_ext_state_size, NULL);
158180e57e5SJohn Baldwin }
159180e57e5SJohn Baldwin *off = len;
160180e57e5SJohn Baldwin }
1614da47b2fSMarcel Moolenaar
16236716fe2SMark Johnston bool
elf_is_ifunc_reloc(Elf_Size r_info)16336716fe2SMark Johnston elf_is_ifunc_reloc(Elf_Size r_info)
16436716fe2SMark Johnston {
16536716fe2SMark Johnston
16636716fe2SMark Johnston return (ELF_R_TYPE(r_info) == R_386_IRELATIVE);
16736716fe2SMark Johnston }
16836716fe2SMark Johnston
1697035cf14SKonstantin Belousov #define ERI_LOCAL 0x0001
1707035cf14SKonstantin Belousov
171bde362f5SPeter Wemm /* Process one elf relocation with addend. */
1727251b4bfSJake Burkholder static int
elf_reloc_internal(linker_file_t lf,Elf_Addr relocbase,const void * data,int type,elf_lookup_fn lookup,int flags)173e8855d4fSPeter Wemm elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
1747035cf14SKonstantin Belousov int type, elf_lookup_fn lookup, int flags)
175033f58dfSPeter Wemm {
176aa855a59SPeter Wemm Elf_Addr *where;
177f1d19042SArchie Cobbs Elf_Addr addr;
178aa855a59SPeter Wemm Elf_Addr addend;
179d297ad16SMarcel Moolenaar Elf_Word rtype, symidx;
180aa855a59SPeter Wemm const Elf_Rel *rel;
181aa855a59SPeter Wemm const Elf_Rela *rela;
182cff8c6f2SKonstantin Belousov int error;
183033f58dfSPeter Wemm
184aa855a59SPeter Wemm switch (type) {
185aa855a59SPeter Wemm case ELF_RELOC_REL:
1860a5e03ddSMatthew Dillon rel = (const Elf_Rel *)data;
187aa855a59SPeter Wemm where = (Elf_Addr *) (relocbase + rel->r_offset);
188aa855a59SPeter Wemm addend = *where;
189aa855a59SPeter Wemm rtype = ELF_R_TYPE(rel->r_info);
190d297ad16SMarcel Moolenaar symidx = ELF_R_SYM(rel->r_info);
191aa855a59SPeter Wemm break;
192aa855a59SPeter Wemm case ELF_RELOC_RELA:
1930a5e03ddSMatthew Dillon rela = (const Elf_Rela *)data;
194aa855a59SPeter Wemm where = (Elf_Addr *) (relocbase + rela->r_offset);
195aa855a59SPeter Wemm addend = rela->r_addend;
196aa855a59SPeter Wemm rtype = ELF_R_TYPE(rela->r_info);
197d297ad16SMarcel Moolenaar symidx = ELF_R_SYM(rela->r_info);
198aa855a59SPeter Wemm break;
199aa855a59SPeter Wemm default:
200aa855a59SPeter Wemm panic("unknown reloc type %d\n", type);
201aa855a59SPeter Wemm }
202033f58dfSPeter Wemm
2037035cf14SKonstantin Belousov if ((flags & ERI_LOCAL) != 0) {
2047251b4bfSJake Burkholder if (rtype == R_386_RELATIVE) { /* A + B */
20550c202c5SJeff Roberson addr = elf_relocaddr(lf, relocbase + addend);
2067251b4bfSJake Burkholder if (*where != addr)
2077251b4bfSJake Burkholder *where = addr;
2087251b4bfSJake Burkholder }
2097251b4bfSJake Burkholder return (0);
2107251b4bfSJake Burkholder }
2117251b4bfSJake Burkholder
212aa855a59SPeter Wemm switch (rtype) {
213aa855a59SPeter Wemm case R_386_NONE: /* none */
214033f58dfSPeter Wemm break;
215033f58dfSPeter Wemm
216aa855a59SPeter Wemm case R_386_32: /* S + A */
217cff8c6f2SKonstantin Belousov error = lookup(lf, symidx, 1, &addr);
218cff8c6f2SKonstantin Belousov if (error != 0)
2198481aab1SMitchell Horne return (-1);
220aa855a59SPeter Wemm addr += addend;
221033f58dfSPeter Wemm if (*where != addr)
222033f58dfSPeter Wemm *where = addr;
223033f58dfSPeter Wemm break;
224033f58dfSPeter Wemm
225aa855a59SPeter Wemm case R_386_PC32: /* S + A - P */
226cff8c6f2SKonstantin Belousov error = lookup(lf, symidx, 1, &addr);
227cff8c6f2SKonstantin Belousov if (error != 0)
2288481aab1SMitchell Horne return (-1);
229aa855a59SPeter Wemm addr += addend - (Elf_Addr)where;
230033f58dfSPeter Wemm if (*where != addr)
231033f58dfSPeter Wemm *where = addr;
232033f58dfSPeter Wemm break;
233033f58dfSPeter Wemm
234aa855a59SPeter Wemm case R_386_COPY: /* none */
235033f58dfSPeter Wemm /*
236033f58dfSPeter Wemm * There shouldn't be copy relocations in kernel
237033f58dfSPeter Wemm * objects.
238033f58dfSPeter Wemm */
2398481aab1SMitchell Horne printf("kldload: unexpected R_COPY relocation, "
2408481aab1SMitchell Horne "symbol index %d\n", symidx);
2418481aab1SMitchell Horne return (-1);
242033f58dfSPeter Wemm break;
243033f58dfSPeter Wemm
244aa855a59SPeter Wemm case R_386_GLOB_DAT: /* S */
245c84617e8SDmitry Chagin case R_386_JMP_SLOT: /* S */
246cff8c6f2SKonstantin Belousov error = lookup(lf, symidx, 1, &addr);
247cff8c6f2SKonstantin Belousov if (error != 0)
2488481aab1SMitchell Horne return (-1);
249033f58dfSPeter Wemm if (*where != addr)
250033f58dfSPeter Wemm *where = addr;
251033f58dfSPeter Wemm break;
252033f58dfSPeter Wemm
2537251b4bfSJake Burkholder case R_386_RELATIVE:
254033f58dfSPeter Wemm break;
255033f58dfSPeter Wemm
2567035cf14SKonstantin Belousov case R_386_IRELATIVE:
2577035cf14SKonstantin Belousov addr = relocbase + addend;
2587035cf14SKonstantin Belousov addr = ((Elf_Addr (*)(void))addr)();
2597035cf14SKonstantin Belousov if (*where != addr)
2607035cf14SKonstantin Belousov *where = addr;
2617035cf14SKonstantin Belousov break;
26231607861SKonstantin Belousov
263033f58dfSPeter Wemm default:
2648481aab1SMitchell Horne printf("kldload: unexpected relocation type %d, "
2658481aab1SMitchell Horne "symbol index %d\n", rtype, symidx);
2668481aab1SMitchell Horne return (-1);
267033f58dfSPeter Wemm }
268033f58dfSPeter Wemm return(0);
269033f58dfSPeter Wemm }
2701aeb23cdSMarcel Moolenaar
2711aeb23cdSMarcel Moolenaar int
elf_reloc(linker_file_t lf,Elf_Addr relocbase,const void * data,int type,elf_lookup_fn lookup)272e8855d4fSPeter Wemm elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
273e8855d4fSPeter Wemm elf_lookup_fn lookup)
2747251b4bfSJake Burkholder {
2757251b4bfSJake Burkholder
2767035cf14SKonstantin Belousov return (elf_reloc_internal(lf, relocbase, data, type, lookup, 0));
2777251b4bfSJake Burkholder }
2787251b4bfSJake Burkholder
2797251b4bfSJake Burkholder int
elf_reloc_local(linker_file_t lf,Elf_Addr relocbase,const void * data,int type,elf_lookup_fn lookup)280e8855d4fSPeter Wemm elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
281e8855d4fSPeter Wemm int type, elf_lookup_fn lookup)
2827251b4bfSJake Burkholder {
2837251b4bfSJake Burkholder
2847035cf14SKonstantin Belousov return (elf_reloc_internal(lf, relocbase, data, type, lookup,
2857035cf14SKonstantin Belousov ERI_LOCAL));
2867251b4bfSJake Burkholder }
2877251b4bfSJake Burkholder
2887251b4bfSJake Burkholder int
elf_cpu_load_file(linker_file_t lf __unused)2891aeb23cdSMarcel Moolenaar elf_cpu_load_file(linker_file_t lf __unused)
2901aeb23cdSMarcel Moolenaar {
2911aeb23cdSMarcel Moolenaar
2921aeb23cdSMarcel Moolenaar return (0);
2931aeb23cdSMarcel Moolenaar }
2941aeb23cdSMarcel Moolenaar
2951aeb23cdSMarcel Moolenaar int
elf_cpu_unload_file(linker_file_t lf __unused)2961aeb23cdSMarcel Moolenaar elf_cpu_unload_file(linker_file_t lf __unused)
2971aeb23cdSMarcel Moolenaar {
2981aeb23cdSMarcel Moolenaar
2991aeb23cdSMarcel Moolenaar return (0);
3001aeb23cdSMarcel Moolenaar }
3017821a820SBrandon Bergren
3027821a820SBrandon Bergren int
elf_cpu_parse_dynamic(caddr_t loadbase __unused,Elf_Dyn * dynamic __unused)30330693808SBrandon Bergren elf_cpu_parse_dynamic(caddr_t loadbase __unused, Elf_Dyn *dynamic __unused)
3047821a820SBrandon Bergren {
3057821a820SBrandon Bergren
3067821a820SBrandon Bergren return (0);
3077821a820SBrandon Bergren }
308