Annotation of sys/arch/alpha/stand/loadfile.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: loadfile.c,v 1.17 2005/08/10 16:58:42 todd Exp $ */
2: /* $NetBSD: loadfile.c,v 1.3 1997/04/06 08:40:59 cgd Exp $ */
3:
4: /*
5: * Copyright (c) 1992, 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * This code is derived from software contributed to Berkeley by
9: * Ralph Campbell.
10: *
11: * Redistribution and use in source and binary forms, with or without
12: * modification, are permitted provided that the following conditions
13: * are met:
14: * 1. Redistributions of source code must retain the above copyright
15: * notice, this list of conditions and the following disclaimer.
16: * 2. Redistributions in binary form must reproduce the above copyright
17: * notice, this list of conditions and the following disclaimer in the
18: * documentation and/or other materials provided with the distribution.
19: * 3. Neither the name of the University nor the names of its contributors
20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: *
35: * @(#)boot.c 8.1 (Berkeley) 6/10/93
36: */
37:
38: #define ELFSIZE 64
39:
40: #include <lib/libkern/libkern.h>
41: #include <lib/libsa/stand.h>
42:
43: #include <sys/param.h>
44: #include <sys/exec.h>
45: #include <sys/exec_ecoff.h>
46: #include <sys/exec_elf.h>
47:
48: #include <machine/rpb.h>
49: #include <machine/prom.h>
50:
51: #include <ddb/db_aout.h>
52:
53: #define _KERNEL
54: #include "include/pte.h"
55:
56: #ifdef ALPHA_BOOT_ELF
57: static int elf_exec(int, Elf64_Ehdr *, u_int64_t *);
58: #endif
59: int loadfile(char *, u_int64_t *);
60:
61: paddr_t ffp_save, ptbr_save;
62: vaddr_t ssym, esym;
63:
64: #define WARN(...)
65:
66: /*
67: * Open 'filename', read in program and return the entry point or -1 if error.
68: */
69: int
70: loadfile(fname, entryp)
71: char *fname;
72: u_int64_t *entryp;
73: {
74: struct devices *dp;
75: union {
76: #ifdef ALPHA_BOOT_ELF
77: Elf64_Ehdr elf;
78: #endif
79: } hdr;
80: int fd, rval;
81:
82: (void)printf("Loading %s...\n", fname);
83:
84: /* Open the file. */
85: rval = 1;
86: if ((fd = open(fname, 0)) < 0) {
87: WARN(("open %s: errno %d\n", fname, errno));
88: goto err;
89: }
90:
91: /* Read the exec header. */
92: if (read(fd, &hdr, sizeof(hdr)) != sizeof(hdr)) {
93: WARN(("read header: %s\n", strerror(errno)));
94: goto err;
95: }
96:
97: #ifdef ALPHA_BOOT_ELF
98: if (memcmp(ELFMAG, hdr.elf.e_ident, SELFMAG) == 0) {
99: rval = elf_exec(fd, &hdr.elf, entryp);
100: } else
101: #endif
102: {
103: (void)printf("%s: unknown executable format\n", fname);
104: }
105:
106: err:
107: if (fd >= 0)
108: (void)close(fd);
109: return (rval);
110: }
111:
112: #ifdef ALPHA_BOOT_ELF
113: static int
114: elf_exec(fd, elf, entryp)
115: int fd;
116: Elf64_Ehdr *elf;
117: u_int64_t *entryp;
118: {
119: int i;
120: int first = 1, havesyms;
121: Elf64_Shdr *shp;
122: Elf64_Off off;
123: size_t sz;
124:
125: for (i = 0; i < elf->e_phnum; i++) {
126: Elf64_Phdr phdr;
127: (void)lseek(fd, elf->e_phoff + sizeof(phdr) * i, SEEK_SET);
128: if (read(fd, (void *)&phdr, sizeof(phdr)) != sizeof(phdr)) {
129: WARN(("read phdr: %s\n", strerror(errno)));
130: return (1);
131: }
132: if (phdr.p_type != PT_LOAD ||
133: (phdr.p_flags & (PF_W|PF_X)) == 0)
134: continue;
135:
136: /* Read in segment. */
137: (void)printf("%s%lu", first ? "" : "+", phdr.p_filesz);
138: (void)lseek(fd, phdr.p_offset, SEEK_SET);
139: if (read(fd, (void *)phdr.p_vaddr, phdr.p_filesz) !=
140: phdr.p_filesz) {
141: WARN(("read text: %s\n", strerror(errno)));
142: return (1);
143: }
144: if (first || ffp_save < phdr.p_vaddr + phdr.p_memsz)
145: ffp_save = phdr.p_vaddr + phdr.p_memsz;
146:
147: /* Zero out bss. */
148: if (phdr.p_filesz < phdr.p_memsz) {
149: (void)printf("+%lu", phdr.p_memsz - phdr.p_filesz);
150: bzero((caddr_t)phdr.p_vaddr + phdr.p_filesz,
151: phdr.p_memsz - phdr.p_filesz);
152: }
153: first = 0;
154: }
155:
156: ffp_save = roundup(ffp_save, sizeof(long));
157:
158: /*
159: * Retrieve symbols.
160: */
161: ssym = ffp_save;
162: ffp_save += sizeof(Elf64_Ehdr);
163:
164: if (lseek(fd, elf->e_shoff, SEEK_SET) == -1) {
165: WARN(("seek to section headers: %s\n", strerror(errno)));
166: return (1);
167: }
168:
169: sz = elf->e_shnum * sizeof(Elf64_Shdr);
170: shp = (Elf64_Shdr *)ffp_save;
171: ffp_save += roundup(sz, sizeof(long));
172:
173: if (read(fd, shp, sz) != sz) {
174: WARN(("read section headers: %d\n", strerror(errno)));
175: return (1);
176: }
177:
178: /*
179: * Now load the symbol sections themselves. Make sure the
180: * sections are aligned. Don't bother with string tables if
181: * there are no symbol sections.
182: */
183: off = roundup((sizeof(Elf64_Ehdr) + sz), sizeof(long));
184:
185: for (havesyms = i = 0; i < elf->e_shnum; i++)
186: if (shp[i].sh_type == SHT_SYMTAB)
187: havesyms = 1;
188:
189: if (!havesyms)
190: goto no_syms;
191:
192: for (first = 1, i = 0; i < elf->e_shnum; i++) {
193: if (shp[i].sh_type == SHT_SYMTAB ||
194: shp[i].sh_type == SHT_STRTAB) {
195: printf("%s%ld", first ? " [" : "+",
196: (u_long)shp[i].sh_size);
197: if (lseek(fd, shp[i].sh_offset, SEEK_SET) == -1) {
198: WARN(("lseek symbols: %s\n", strerror(errno)));
199: return (1);
200: }
201: if (read(fd, (void *)ffp_save, shp[i].sh_size) !=
202: shp[i].sh_size) {
203: WARN(("read symbols: %s\n", strerror(errno)));
204: return (1);
205: }
206: ffp_save += roundup(shp[i].sh_size, sizeof(long));
207: shp[i].sh_offset = off;
208: off += roundup(shp[i].sh_size, sizeof(long));
209: first = 0;
210: }
211: }
212: if (havesyms && first == 0)
213: printf("]");
214:
215: elf->e_phoff = 0;
216: elf->e_shoff = sizeof(Elf64_Ehdr);
217: elf->e_phentsize = 0;
218: elf->e_phnum = 0;
219: bcopy(elf, (void *)ssym, sizeof(*elf));
220:
221: no_syms:
222: esym = ffp_save;
223: ffp_save = ALPHA_K0SEG_TO_PHYS((ffp_save + PGOFSET & ~PGOFSET)) >> PGSHIFT;
224: ffp_save += 2; /* XXX OSF/1 does this, no idea why. */
225:
226: (void)printf("\n");
227: *entryp = elf->e_entry;
228: return (0);
229: }
230: #endif /* ALPHA_BOOT_ELF */
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