1/*-
2 * Copyright 1996-1998 John D. Polstra.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
13 *
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.
24 */
25
26#include <sys/cdefs.h>
27__FBSDID("$FreeBSD$");
28
29#include <sys/param.h>
30#include <sys/kernel.h>
31#include <sys/systm.h>
32#include <sys/exec.h>
33#include <sys/imgact.h>
34#include <sys/linker.h>
35#include <sys/sysent.h>
36#include <sys/imgact_elf.h>
37#include <sys/proc.h>
38#include <sys/syscall.h>
39#include <sys/signalvar.h>
40#include <sys/vnode.h>
41
42#include <vm/vm.h>
43#include <vm/pmap.h>
44#include <vm/vm_param.h>
45
46#include <machine/elf.h>
47#include <machine/md_var.h>
48
49struct sysentvec elf32_freebsd_sysvec = {
50	.sv_size	= SYS_MAXSYSCALL,
51	.sv_table	= sysent,
52	.sv_mask	= 0,
53	.sv_sigsize	= 0,
54	.sv_sigtbl	= NULL,
55	.sv_errsize	= 0,
56	.sv_errtbl	= NULL,
57	.sv_transtrap	= NULL,
58	.sv_fixup	= __elfN(freebsd_fixup),
59	.sv_sendsig	= sendsig,
60	.sv_sigcode	= sigcode,
61	.sv_szsigcode	= &szsigcode,
62	.sv_prepsyscall	= NULL,
63	.sv_name	= "FreeBSD ELF32",
64	.sv_coredump	= __elfN(coredump),
65	.sv_imgact_try	= NULL,
66	.sv_minsigstksz	= MINSIGSTKSZ,
67	.sv_pagesize	= PAGE_SIZE,
68	.sv_minuser	= VM_MIN_ADDRESS,
69	.sv_maxuser	= VM_MAXUSER_ADDRESS,
70	.sv_usrstack	= USRSTACK,
71	.sv_psstrings	= PS_STRINGS,
72	.sv_stackprot	= VM_PROT_ALL,
73	.sv_copyout_strings = exec_copyout_strings,
74	.sv_setregs	= exec_setregs,
75	.sv_fixlimit	= NULL,
76	.sv_maxssiz	= NULL,
77	.sv_flags	= SV_ABI_FREEBSD | SV_ILP32,
78	.sv_set_syscall_retval = cpu_set_syscall_retval,
79	.sv_fetch_syscall_args = cpu_fetch_syscall_args,
80	.sv_syscallnames = syscallnames,
81	.sv_schedtail	= NULL,
82};
83
84static Elf32_Brandinfo freebsd_brand_info = {
85	.brand		= ELFOSABI_FREEBSD,
86	.machine	= EM_ARM,
87	.compat_3_brand	= "FreeBSD",
88	.emul_path	= NULL,
89	.interp_path	= "/libexec/ld-elf.so.1",
90	.sysvec		= &elf32_freebsd_sysvec,
91	.interp_newpath	= NULL,
92	.brand_note	= &elf32_freebsd_brandnote,
93	.flags		= BI_CAN_EXEC_DYN | BI_BRAND_NOTE
94};
95
96SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
97	(sysinit_cfunc_t) elf32_insert_brand_entry,
98	&freebsd_brand_info);
99
100static Elf32_Brandinfo freebsd_brand_oinfo = {
101	.brand		= ELFOSABI_FREEBSD,
102	.machine	= EM_ARM,
103	.compat_3_brand	= "FreeBSD",
104	.emul_path	= NULL,
105	.interp_path	= "/usr/libexec/ld-elf.so.1",
106	.sysvec		= &elf32_freebsd_sysvec,
107	.interp_newpath	= NULL,
108	.brand_note	= &elf32_freebsd_brandnote,
109	.flags		= BI_CAN_EXEC_DYN | BI_BRAND_NOTE
110};
111
112SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
113	(sysinit_cfunc_t) elf32_insert_brand_entry,
114	&freebsd_brand_oinfo);
115
116
117void
118elf32_dump_thread(struct thread *td __unused, void *dst __unused,
119    size_t *off __unused)
120{
121}
122
123
124/* Process one elf relocation with addend. */
125static int
126elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
127    int type, int local, elf_lookup_fn lookup)
128{
129	Elf_Addr *where;
130	Elf_Addr addr;
131	Elf_Addr addend;
132	Elf_Word rtype, symidx;
133	const Elf_Rel *rel;
134	const Elf_Rela *rela;
135
136	switch (type) {
137	case ELF_RELOC_REL:
138		rel = (const Elf_Rel *)data;
139		where = (Elf_Addr *) (relocbase + rel->r_offset);
140		addend = *where;
141		rtype = ELF_R_TYPE(rel->r_info);
142		symidx = ELF_R_SYM(rel->r_info);
143		break;
144	case ELF_RELOC_RELA:
145		rela = (const Elf_Rela *)data;
146		where = (Elf_Addr *) (relocbase + rela->r_offset);
147		addend = rela->r_addend;
148		rtype = ELF_R_TYPE(rela->r_info);
149		symidx = ELF_R_SYM(rela->r_info);
150		break;
151	default:
152		panic("unknown reloc type %d\n", type);
153	}
154
155	if (local) {
156		if (rtype == R_ARM_RELATIVE) {	/* A + B */
157			addr = elf_relocaddr(lf, relocbase + addend);
158			if (*where != addr)
159				*where = addr;
160		}
161		return (0);
162	}
163
164	switch (rtype) {
165
166		case R_ARM_NONE:	/* none */
167			break;
168
169		case R_ARM_ABS32:
170			addr = lookup(lf, symidx, 1);
171			if (addr == 0)
172				return -1;
173			*where += addr;
174			break;
175
176		case R_ARM_COPY:	/* none */
177			/*
178			 * There shouldn't be copy relocations in kernel
179			 * objects.
180			 */
181			printf("kldload: unexpected R_COPY relocation\n");
182			return -1;
183			break;
184
185		case R_ARM_JUMP_SLOT:
186			addr = lookup(lf, symidx, 1);
187			if (addr) {
188				*where = addr;
189				return (0);
190			}
191			return (-1);
192		case R_ARM_RELATIVE:
193			break;
194
195		default:
196			printf("kldload: unexpected relocation type %d\n",
197			       rtype);
198			return -1;
199	}
200	return(0);
201}
202
203int
204elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
205    elf_lookup_fn lookup)
206{
207
208	return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
209}
210
211int
212elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
213    int type, elf_lookup_fn lookup)
214{
215
216	return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
217}
218
219int
220elf_cpu_load_file(linker_file_t lf __unused)
221{
222
223	/*
224	 * The pmap code does not do an icache sync upon establishing executable
225	 * mappings in the kernel pmap.  It's an optimization based on the fact
226	 * that kernel memory allocations always have EXECUTABLE protection even
227	 * when the memory isn't going to hold executable code.  The only time
228	 * kernel memory holding instructions does need a sync is after loading
229	 * a kernel module, and that's when this function gets called.  Normal
230	 * data cache maintenance has already been done by the IO code, and TLB
231	 * maintenance has been done by the pmap code, so all we have to do here
232	 * is invalidate the instruction cache (which also invalidates the
233	 * branch predictor cache on platforms that have one).
234	 */
235	cpu_icache_sync_all();
236	return (0);
237}
238
239int
240elf_cpu_unload_file(linker_file_t lf __unused)
241{
242
243	return (0);
244}
245