1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /*
28 * Copyright 2020 Joyent, Inc.
29 */
30
31 #include <sys/types.h>
32 #include <sys/inttypes.h>
33 #include <sys/systm.h>
34 #include <sys/elf.h>
35 #include <sys/elf_notes.h>
36
37 #include <util/memcpy.h>
38
39 #include "dboot_xboot.h"
40 #include "dboot_elfload.h"
41 #include "dboot_printf.h"
42
43 static caddr_t elf_file = 0;
44
45 #define PGETBYTES(offset) ((void *)(elf_file + (offset)))
46
47 static void *
48 getehdr(void)
49 {
50 uchar_t *ident;
51 void *hdr = NULL;
52
53 ident = PGETBYTES(0);
54 if (ident == NULL)
55 dboot_panic("Cannot read kernel ELF header");
56
57 if (ident[EI_MAG0] != ELFMAG0 || ident[EI_MAG1] != ELFMAG1 ||
58 ident[EI_MAG2] != ELFMAG2 || ident[EI_MAG3] != ELFMAG3)
59 dboot_panic("not an ELF file!");
60
61 if (ident[EI_CLASS] == ELFCLASS32)
62 hdr = PGETBYTES(0);
63 else if (ident[EI_CLASS] == ELFCLASS64)
64 hdr = PGETBYTES(0);
65 else
66 dboot_panic("Unknown ELF class");
67
68 return (hdr);
69 }
70
71
72 /*
73 * parse the elf file for program information
74 */
75 int
76 dboot_elfload64(uintptr_t file_image)
77 {
78 Elf64_Ehdr *eh;
79 Elf64_Phdr *phdr;
80 Elf64_Shdr *shdr;
81 caddr_t allphdrs, sechdrs;
82 int i;
83 paddr_t src;
84 paddr_t dst;
85 paddr_t next_addr;
86
87 elf_file = (caddr_t)file_image;
88
89 allphdrs = NULL;
90
91 eh = getehdr();
92 if (eh == NULL)
93 dboot_panic("getehdr() failed");
94
95 if (eh->e_type != ET_EXEC)
96 dboot_panic("not ET_EXEC, e_type = 0x%x", eh->e_type);
97
98 if (eh->e_phnum == 0 || eh->e_phoff == 0)
99 dboot_panic("no program headers");
100
101 /*
102 * Get the program headers.
103 */
104 allphdrs = PGETBYTES(eh->e_phoff);
105 if (allphdrs == NULL)
106 dboot_panic("Failed to get program headers e_phnum = %d",
107 eh->e_phnum);
108
109 /*
110 * Get the section headers.
111 */
112 sechdrs = PGETBYTES(eh->e_shoff);
113 if (sechdrs == NULL)
114 dboot_panic("Failed to get section headers e_shnum = %d",
115 eh->e_shnum);
116
117 /*
118 * Next look for interesting program headers.
119 */
120 for (i = 0; i < eh->e_phnum; i++) {
121 /*LINTED [ELF program header alignment]*/
122 phdr = (Elf64_Phdr *)(allphdrs + eh->e_phentsize * i);
123
124 /*
125 * Dynamically-linked executable.
126 * Complain.
127 */
128 if (phdr->p_type == PT_INTERP) {
129 dboot_printf("warning: PT_INTERP section\n");
130 continue;
131 }
132
133 /*
134 * at this point we only care about PT_LOAD segments
135 */
136 if (phdr->p_type != PT_LOAD)
137 continue;
138
139 if (phdr->p_flags == (PF_R | PF_W) && phdr->p_vaddr == 0) {
140 dboot_printf("warning: krtld reloc info?\n");
141 continue;
142 }
143
144 /*
145 * If memory size is zero just ignore this header.
146 */
147 if (phdr->p_memsz == 0)
148 continue;
149
150 /*
151 * If load address 1:1 then ignore this header.
152 */
153 if (phdr->p_paddr == phdr->p_vaddr) {
154 if (prom_debug)
155 dboot_printf("Skipping PT_LOAD segment for "
156 "paddr = 0x%lx\n", (ulong_t)phdr->p_paddr);
157 continue;
158 }
159
160 /*
161 * copy the data to kernel area
162 */
163 if (phdr->p_paddr != FOUR_MEG && phdr->p_paddr != 2 * FOUR_MEG)
164 dboot_panic("Bad paddr for kernel nucleus segment");
165 src = (uintptr_t)PGETBYTES(phdr->p_offset);
166 dst = ktext_phys + phdr->p_paddr - FOUR_MEG;
167 if (prom_debug)
168 dboot_printf("copying %ld bytes from ELF offset 0x%lx "
169 "to physaddr 0x%lx (va=0x%lx)\n",
170 (ulong_t)phdr->p_filesz, (ulong_t)phdr->p_offset,
171 (ulong_t)dst, (ulong_t)phdr->p_vaddr);
172 (void) memcpy((void *)(uintptr_t)dst,
173 (void *)(uintptr_t)src, (size_t)phdr->p_filesz);
174
175 next_addr = dst + phdr->p_filesz;
176 }
177
178
179 /*
180 * Next look for bss
181 */
182 for (i = 0; i < eh->e_shnum; i++) {
183 shdr = (Elf64_Shdr *)(sechdrs + eh->e_shentsize * i);
184
185 /* zero out bss */
186 if (shdr->sh_type == SHT_NOBITS) {
187 if (prom_debug)
188 dboot_printf("zeroing BSS %ld bytes from "
189 "physaddr 0x%" PRIx64
190 " (end=0x%" PRIx64 ")\n",
191 (ulong_t)shdr->sh_size,
192 next_addr,
193 next_addr + shdr->sh_size);
194 (void) memset((void *)(uintptr_t)next_addr, 0,
195 shdr->sh_size);
196 break;
197 }
198 }
199
200 /*
201 * Ignore the intepreter (or should we die if there is one??)
202 */
203 return (0);
204 }