elf32_machdep.c revision 294136
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 * $FreeBSD: stable/10/sys/powerpc/powerpc/elf32_machdep.c 294136 2016-01-16 07:56:49Z dchagin $
26 */
27
28#include <sys/param.h>
29#include <sys/kernel.h>
30#include <sys/systm.h>
31
32#define __ELF_WORD_SIZE 32
33
34#include <sys/exec.h>
35#include <sys/imgact.h>
36#include <sys/malloc.h>
37#include <sys/proc.h>
38#include <sys/namei.h>
39#include <sys/fcntl.h>
40#include <sys/sysent.h>
41#include <sys/imgact_elf.h>
42#include <sys/syscall.h>
43#include <sys/signalvar.h>
44#include <sys/vnode.h>
45#include <sys/linker.h>
46
47#include <vm/vm.h>
48#include <vm/vm_param.h>
49
50#include <machine/cpu.h>
51#include <machine/elf.h>
52#include <machine/reg.h>
53#include <machine/md_var.h>
54
55#ifdef __powerpc64__
56#include <compat/freebsd32/freebsd32_proto.h>
57#include <compat/freebsd32/freebsd32_util.h>
58
59extern const char *freebsd32_syscallnames[];
60#endif
61
62struct sysentvec elf32_freebsd_sysvec = {
63	.sv_size	= SYS_MAXSYSCALL,
64#ifdef __powerpc64__
65	.sv_table	= freebsd32_sysent,
66#else
67	.sv_table	= sysent,
68#endif
69	.sv_mask	= 0,
70	.sv_sigsize	= 0,
71	.sv_sigtbl	= NULL,
72	.sv_errsize	= 0,
73	.sv_errtbl	= NULL,
74	.sv_transtrap	= NULL,
75	.sv_fixup	= __elfN(freebsd_fixup),
76	.sv_sendsig	= sendsig,
77	.sv_sigcode	= sigcode32,
78	.sv_szsigcode	= &szsigcode32,
79	.sv_prepsyscall	= NULL,
80	.sv_name	= "FreeBSD ELF32",
81	.sv_coredump	= __elfN(coredump),
82	.sv_imgact_try	= NULL,
83	.sv_minsigstksz	= MINSIGSTKSZ,
84	.sv_pagesize	= PAGE_SIZE,
85	.sv_minuser	= VM_MIN_ADDRESS,
86	.sv_stackprot	= VM_PROT_ALL,
87#ifdef __powerpc64__
88	.sv_maxuser	= VM_MAXUSER_ADDRESS,
89	.sv_usrstack	= FREEBSD32_USRSTACK,
90	.sv_psstrings	= FREEBSD32_PS_STRINGS,
91	.sv_copyout_strings = freebsd32_copyout_strings,
92	.sv_setregs	= ppc32_setregs,
93	.sv_syscallnames = freebsd32_syscallnames,
94#else
95	.sv_maxuser	= VM_MAXUSER_ADDRESS,
96	.sv_usrstack	= USRSTACK,
97	.sv_psstrings	= PS_STRINGS,
98	.sv_copyout_strings = exec_copyout_strings,
99	.sv_setregs	= exec_setregs,
100	.sv_syscallnames = syscallnames,
101#endif
102	.sv_fixlimit	= NULL,
103	.sv_maxssiz	= NULL,
104	.sv_flags	= SV_ABI_FREEBSD | SV_ILP32 | SV_SHP,
105	.sv_set_syscall_retval = cpu_set_syscall_retval,
106	.sv_fetch_syscall_args = cpu_fetch_syscall_args,
107	.sv_shared_page_base = FREEBSD32_SHAREDPAGE,
108	.sv_shared_page_len = PAGE_SIZE,
109	.sv_schedtail	= NULL,
110	.sv_thread_detach = NULL,
111	.sv_trap	= NULL,
112};
113INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec);
114
115static Elf32_Brandinfo freebsd_brand_info = {
116	.brand		= ELFOSABI_FREEBSD,
117	.machine	= EM_PPC,
118	.compat_3_brand	= "FreeBSD",
119	.emul_path	= NULL,
120	.interp_path	= "/libexec/ld-elf.so.1",
121	.sysvec		= &elf32_freebsd_sysvec,
122#ifdef __powerpc64__
123	.interp_newpath	= "/libexec/ld-elf32.so.1",
124#else
125	.interp_newpath	= NULL,
126#endif
127	.brand_note	= &elf32_freebsd_brandnote,
128	.flags		= BI_CAN_EXEC_DYN | BI_BRAND_NOTE
129};
130
131SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
132    (sysinit_cfunc_t) elf32_insert_brand_entry,
133    &freebsd_brand_info);
134
135static Elf32_Brandinfo freebsd_brand_oinfo = {
136	.brand		= ELFOSABI_FREEBSD,
137	.machine	= EM_PPC,
138	.compat_3_brand	= "FreeBSD",
139	.emul_path	= NULL,
140	.interp_path	= "/usr/libexec/ld-elf.so.1",
141	.sysvec		= &elf32_freebsd_sysvec,
142	.interp_newpath	= NULL,
143	.brand_note	= &elf32_freebsd_brandnote,
144	.flags		= BI_CAN_EXEC_DYN | BI_BRAND_NOTE
145};
146
147SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
148	(sysinit_cfunc_t) elf32_insert_brand_entry,
149	&freebsd_brand_oinfo);
150
151void
152elf32_dump_thread(struct thread *td __unused, void *dst __unused,
153    size_t *off __unused)
154{
155}
156
157#ifndef __powerpc64__
158/* Process one elf relocation with addend. */
159static int
160elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
161    int type, int local, elf_lookup_fn lookup)
162{
163	Elf_Addr *where;
164	Elf_Half *hwhere;
165	Elf_Addr addr;
166	Elf_Addr addend;
167	Elf_Word rtype, symidx;
168	const Elf_Rela *rela;
169	int error;
170
171	switch (type) {
172	case ELF_RELOC_REL:
173		panic("PPC only supports RELA relocations");
174		break;
175	case ELF_RELOC_RELA:
176		rela = (const Elf_Rela *)data;
177		where = (Elf_Addr *) ((uintptr_t)relocbase + rela->r_offset);
178		hwhere = (Elf_Half *) ((uintptr_t)relocbase + rela->r_offset);
179		addend = rela->r_addend;
180		rtype = ELF_R_TYPE(rela->r_info);
181		symidx = ELF_R_SYM(rela->r_info);
182		break;
183	default:
184		panic("elf_reloc: unknown relocation mode %d\n", type);
185	}
186
187	switch (rtype) {
188
189	case R_PPC_NONE:
190		break;
191
192	case R_PPC_ADDR32: /* word32 S + A */
193		error = lookup(lf, symidx, 1, &addr);
194		if (error != 0)
195			return -1;
196		addr += addend;
197	       	*where = addr;
198			break;
199
200	case R_PPC_ADDR16_LO: /* #lo(S) */
201		error = lookup(lf, symidx, 1, &addr);
202		if (error != 0)
203			return -1;
204		/*
205		 * addend values are sometimes relative to sections
206		 * (i.e. .rodata) in rela, where in reality they
207		 * are relative to relocbase. Detect this condition.
208		 */
209		if (addr > relocbase && addr <= (relocbase + addend))
210			addr = relocbase + addend;
211		else
212			addr += addend;
213		*hwhere = addr & 0xffff;
214		break;
215
216	case R_PPC_ADDR16_HA: /* #ha(S) */
217		error = lookup(lf, symidx, 1, &addr);
218		if (error != 0)
219			return -1;
220		/*
221		 * addend values are sometimes relative to sections
222		 * (i.e. .rodata) in rela, where in reality they
223		 * are relative to relocbase. Detect this condition.
224		 */
225		if (addr > relocbase && addr <= (relocbase + addend))
226			addr = relocbase + addend;
227		else
228			addr += addend;
229		*hwhere = ((addr >> 16) + ((addr & 0x8000) ? 1 : 0))
230		    & 0xffff;
231		break;
232
233	case R_PPC_RELATIVE: /* word32 B + A */
234		*where = elf_relocaddr(lf, relocbase + addend);
235		break;
236
237	default:
238		printf("kldload: unexpected relocation type %d\n",
239		    (int) rtype);
240		return -1;
241	}
242	return(0);
243}
244
245int
246elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
247    elf_lookup_fn lookup)
248{
249
250	return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
251}
252
253int
254elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
255    int type, elf_lookup_fn lookup)
256{
257
258	return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
259}
260
261int
262elf_cpu_load_file(linker_file_t lf)
263{
264	/* Only sync the cache for non-kernel modules */
265	if (lf->id != 1)
266		__syncicache(lf->address, lf->size);
267	return (0);
268}
269
270int
271elf_cpu_unload_file(linker_file_t lf __unused)
272{
273
274	return (0);
275}
276#endif
277