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1.1 root 1: /* a.out boot loader
2: * As we have seek, this implementation can be straightforward.
3: * 2003-07 by SONE Takeshi
4: */
5:
6: #include "config.h"
7: #include "kernel/kernel.h"
8:
9: #ifdef CONFIG_SPARC64
10: #define CONFIG_SPARC64_PAGE_SIZE_8KB
11: #endif
12:
13: #include "libopenbios/sys_info.h"
14: #include "libopenbios/bindings.h"
15: #include "libopenbios/aout_load.h"
16: #include "libc/diskio.h"
17: #define printf printk
18: #define debug printk
19:
20: #define addr_fixup(addr) ((addr) & 0x00ffffff)
21:
22: static char *image_name, *image_version;
23: static int fd;
24:
25: static int
26: check_mem_ranges(struct sys_info *info,
27: unsigned long start,
28: unsigned long size)
29: {
30: int j;
31: unsigned long end;
32: unsigned long prog_start, prog_end;
33: struct memrange *mem;
34:
35: prog_start = virt_to_phys(&_start);
36: prog_end = virt_to_phys(&_end);
37:
38: end = start + size;
39:
40: if (start < prog_start && end > prog_start)
41: goto conflict;
42: if (start < prog_end && end > prog_end)
43: goto conflict;
44: mem = info->memrange;
45: for (j = 0; j < info->n_memranges; j++) {
46: if (mem[j].base <= start && mem[j].base + mem[j].size >= end)
47: break;
48: }
49: if (j >= info->n_memranges)
50: goto badseg;
51: return 1;
52:
53: conflict:
54: printf("%s occupies [%#lx-%#lx]\n", program_name, prog_start, prog_end);
55:
56: badseg:
57: printf("A.out file [%#lx-%#lx] doesn't fit into memory\n", start, end - 1);
58: return 0;
59: }
60:
61: int
62: is_aout(struct exec *ehdr)
63: {
64: return ((ehdr->a_info & 0xffff) == OMAGIC
65: || (ehdr->a_info & 0xffff) == NMAGIC
66: || (ehdr->a_info & 0xffff) == ZMAGIC
67: || (ehdr->a_info & 0xffff) == QMAGIC);
68: }
69:
70: int
71: aout_load(struct sys_info *info, ihandle_t dev)
72: {
73: int retval = -1;
74: struct exec ehdr;
75: unsigned long start, size;
76: unsigned int offset;
77:
78: image_name = image_version = NULL;
79:
80: /* Mark the saved-program-state as invalid */
81: feval("0 state-valid !");
82:
83: fd = open_ih(dev);
84: if (fd == -1) {
85: goto out;
86: }
87:
88: for (offset = 0; offset < 16 * 512; offset += 512) {
89: seek_io(fd, offset);
90: if (read_io(fd, &ehdr, sizeof ehdr) != sizeof ehdr) {
91: debug("Can't read a.out header\n");
92: retval = LOADER_NOT_SUPPORT;
93: goto out;
94: }
95: if (is_aout(&ehdr))
96: break;
97: }
98:
99: if (!is_aout(&ehdr)) {
100: debug("Not a bootable a.out image\n");
101: retval = LOADER_NOT_SUPPORT;
102: goto out;
103: }
104:
105: if (ehdr.a_text == 0x30800007)
106: ehdr.a_text=64*1024;
107:
108: if (N_MAGIC(ehdr) == NMAGIC) {
109: size = addr_fixup(N_DATADDR(ehdr)) + addr_fixup(ehdr.a_data);
110: } else {
111: size = addr_fixup(ehdr.a_text) + addr_fixup(ehdr.a_data);
112: }
113:
114: if (size < 7680)
115: size = 7680;
116:
117: fword("load-base");
118: start = POP(); // N_TXTADDR(ehdr);
119:
120: if (!check_mem_ranges(info, start, size))
121: goto out;
122:
123: printf("Loading a.out %s...\n", image_name ? image_name : "image");
124:
125: seek_io(fd, offset + N_TXTOFF(ehdr));
126:
127: if (N_MAGIC(ehdr) == NMAGIC) {
128: if ((size_t)read_io(fd, (void *)start, ehdr.a_text) != ehdr.a_text) {
129: printf("Can't read program text segment (size 0x" FMT_aout_ehdr ")\n", ehdr.a_text);
130: goto out;
131: }
132: if ((size_t)read_io(fd, (void *)(start + N_DATADDR(ehdr)), ehdr.a_data) != ehdr.a_data) {
133: printf("Can't read program data segment (size 0x" FMT_aout_ehdr ")\n", ehdr.a_data);
134: goto out;
135: }
136: } else {
137: if ((size_t)read_io(fd, (void *)start, size) != size) {
138: printf("Can't read program (size 0x" FMT_sizet ")\n", size);
139: goto out;
140: }
141: }
142:
143: debug("Loaded %lu bytes\n", size);
144: debug("entry point is %#lx\n", start);
145:
146: // Initialise saved-program-state
147: PUSH(addr_fixup(start));
148: feval("saved-program-state >sps.entry !");
149: PUSH(size);
150: feval("saved-program-state >sps.file-size !");
151: feval("aout saved-program-state >sps.file-type !");
152:
153: feval("-1 state-valid !");
154:
155: out:
156: close_io(fd);
157: return retval;
158: }
159:
160: void
161: aout_init_program(void)
162: {
163: // Currently not implemented
164: feval("0 state-valid !");
165: }
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