Annotation of src/external/gpl3/binutils.old/dist/bfd/cpu-i386.c, Revision 1.5.2.1
1.1 christos 1: /* BFD support for the Intel 386 architecture.
1.5.2.1 ! martin 2: Copyright (C) 1992-2018 Free Software Foundation, Inc.
1.1 christos 3:
4: This file is part of BFD, the Binary File Descriptor library.
5:
6: This program is free software; you can redistribute it and/or modify
7: it under the terms of the GNU General Public License as published by
8: the Free Software Foundation; either version 3 of the License, or
9: (at your option) any later version.
10:
11: This program is distributed in the hope that it will be useful,
12: but WITHOUT ANY WARRANTY; without even the implied warranty of
13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14: GNU General Public License for more details.
15:
16: You should have received a copy of the GNU General Public License
17: along with this program; if not, write to the Free Software
18: Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
19: MA 02110-1301, USA. */
20:
21: #include "sysdep.h"
22: #include "bfd.h"
23: #include "libbfd.h"
24: #include "libiberty.h"
25:
26: extern void * bfd_arch_i386_short_nop_fill (bfd_size_type, bfd_boolean,
27: bfd_boolean);
28:
29: static const bfd_arch_info_type *
30: bfd_i386_compatible (const bfd_arch_info_type *a,
31: const bfd_arch_info_type *b)
32: {
33: const bfd_arch_info_type *compat = bfd_default_compatible (a, b);
34:
35: /* Don't allow mixing x64_32 with x86_64. */
36: if (compat
37: && (a->mach & bfd_mach_x64_32) != (b->mach & bfd_mach_x64_32))
38: compat = NULL;
39:
40: return compat;
41: }
42:
43: /* Fill the buffer with zero or nop instruction if CODE is TRUE. Use
44: multi byte nop instructions if LONG_NOP is TRUE. */
45:
46: static void *
47: bfd_arch_i386_fill (bfd_size_type count, bfd_boolean code,
48: bfd_boolean long_nop)
49: {
50: /* nop */
1.3 christos 51: static const char nop_1[] = { 0x90 };
1.1 christos 52: /* xchg %ax,%ax */
53: static const char nop_2[] = { 0x66, 0x90 };
54: /* nopl (%[re]ax) */
55: static const char nop_3[] = { 0x0f, 0x1f, 0x00 };
56: /* nopl 0(%[re]ax) */
57: static const char nop_4[] = { 0x0f, 0x1f, 0x40, 0x00 };
58: /* nopl 0(%[re]ax,%[re]ax,1) */
59: static const char nop_5[] = { 0x0f, 0x1f, 0x44, 0x00, 0x00 };
60: /* nopw 0(%[re]ax,%[re]ax,1) */
61: static const char nop_6[] = { 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 };
62: /* nopl 0L(%[re]ax) */
63: static const char nop_7[] = { 0x0f, 0x1f, 0x80, 0x00, 0x00, 0x00, 0x00 };
64: /* nopl 0L(%[re]ax,%[re]ax,1) */
65: static const char nop_8[] =
66: { 0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00};
67: /* nopw 0L(%[re]ax,%[re]ax,1) */
68: static const char nop_9[] =
69: { 0x66, 0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00 };
70: /* nopw %cs:0L(%[re]ax,%[re]ax,1) */
71: static const char nop_10[] =
72: { 0x66, 0x2e, 0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00 };
73: static const char *const nops[] =
74: { nop_1, nop_2, nop_3, nop_4, nop_5,
75: nop_6, nop_7, nop_8, nop_9, nop_10 };
76: bfd_size_type nop_size = long_nop ? ARRAY_SIZE (nops) : 2;
77:
78: void *fill = bfd_malloc (count);
79: if (fill == NULL)
80: return fill;
81:
82: if (code)
83: {
84: bfd_byte *p = fill;
85: while (count >= nop_size)
86: {
87: memcpy (p, nops[nop_size - 1], nop_size);
88: p += nop_size;
89: count -= nop_size;
90: }
91: if (count != 0)
92: memcpy (p, nops[count - 1], count);
93: }
94: else
95: memset (fill, 0, count);
96:
97: return fill;
98: }
99:
100: /* Fill the buffer with zero or short nop instruction if CODE is TRUE. */
101:
102: void *
103: bfd_arch_i386_short_nop_fill (bfd_size_type count,
104: bfd_boolean is_bigendian ATTRIBUTE_UNUSED,
105: bfd_boolean code)
106: {
107: return bfd_arch_i386_fill (count, code, FALSE);
108: }
109:
110: /* Fill the buffer with zero or long nop instruction if CODE is TRUE. */
111:
112: static void *
113: bfd_arch_i386_long_nop_fill (bfd_size_type count,
114: bfd_boolean is_bigendian ATTRIBUTE_UNUSED,
115: bfd_boolean code)
116: {
117: return bfd_arch_i386_fill (count, code, TRUE);
118: }
119:
1.3 christos 120: /* Fill the buffer with zero, or one-byte nop instructions if CODE is TRUE. */
121:
122: static void *
123: bfd_arch_i386_onebyte_nop_fill (bfd_size_type count,
124: bfd_boolean is_bigendian ATTRIBUTE_UNUSED,
125: bfd_boolean code)
126: {
127: void *fill = bfd_malloc (count);
128: if (fill != NULL)
129: memset (fill, code ? 0x90 : 0, count);
130: return fill;
131: }
132:
133:
134: static const bfd_arch_info_type bfd_x64_32_nacl_arch =
135: {
136: 64, /* 64 bits in a word */
137: 64, /* 64 bits in an address */
138: 8, /* 8 bits in a byte */
139: bfd_arch_i386,
140: bfd_mach_x64_32_nacl,
141: "i386",
142: "i386:x64-32:nacl",
143: 3,
144: FALSE,
145: bfd_i386_compatible,
146: bfd_default_scan,
147: bfd_arch_i386_onebyte_nop_fill,
148: NULL
149: };
150:
151: static const bfd_arch_info_type bfd_x86_64_nacl_arch =
152: {
153: 64, /* 64 bits in a word */
154: 64, /* 64 bits in an address */
155: 8, /* 8 bits in a byte */
156: bfd_arch_i386,
157: bfd_mach_x86_64_nacl,
158: "i386",
159: "i386:x86-64:nacl",
160: 3,
161: FALSE,
162: bfd_i386_compatible,
163: bfd_default_scan,
164: bfd_arch_i386_onebyte_nop_fill,
165: &bfd_x64_32_nacl_arch
166: };
167:
168: const bfd_arch_info_type bfd_i386_nacl_arch =
169: {
170: 32, /* 32 bits in a word */
171: 32, /* 32 bits in an address */
172: 8, /* 8 bits in a byte */
173: bfd_arch_i386,
174: bfd_mach_i386_i386_nacl,
175: "i386",
176: "i386:nacl",
177: 3,
178: TRUE,
179: bfd_i386_compatible,
180: bfd_default_scan,
181: bfd_arch_i386_onebyte_nop_fill,
182: &bfd_x86_64_nacl_arch
183: };
184:
1.1 christos 185: static const bfd_arch_info_type bfd_x64_32_arch_intel_syntax =
186: {
187: 64, /* 64 bits in a word */
188: 64, /* 64 bits in an address */
189: 8, /* 8 bits in a byte */
190: bfd_arch_i386,
191: bfd_mach_x64_32_intel_syntax,
192: "i386:intel",
193: "i386:x64-32:intel",
194: 3,
195: FALSE,
196: bfd_i386_compatible,
197: bfd_default_scan,
198: bfd_arch_i386_long_nop_fill,
1.3 christos 199: &bfd_i386_nacl_arch
1.1 christos 200: };
201:
202: static const bfd_arch_info_type bfd_x86_64_arch_intel_syntax =
203: {
204: 64, /* 64 bits in a word */
205: 64, /* 64 bits in an address */
206: 8, /* 8 bits in a byte */
207: bfd_arch_i386,
208: bfd_mach_x86_64_intel_syntax,
209: "i386:intel",
210: "i386:x86-64:intel",
211: 3,
212: FALSE,
213: bfd_i386_compatible,
214: bfd_default_scan,
215: bfd_arch_i386_long_nop_fill,
216: &bfd_x64_32_arch_intel_syntax,
217: };
218:
219: static const bfd_arch_info_type bfd_i386_arch_intel_syntax =
220: {
221: 32, /* 32 bits in a word */
222: 32, /* 32 bits in an address */
223: 8, /* 8 bits in a byte */
224: bfd_arch_i386,
225: bfd_mach_i386_i386_intel_syntax,
226: "i386:intel",
227: "i386:intel",
228: 3,
229: TRUE,
230: bfd_i386_compatible,
231: bfd_default_scan,
232: bfd_arch_i386_short_nop_fill,
233: &bfd_x86_64_arch_intel_syntax
234: };
235:
236: static const bfd_arch_info_type i8086_arch =
237: {
238: 32, /* 32 bits in a word */
239: 32, /* 32 bits in an address (well, not really) */
240: 8, /* 8 bits in a byte */
241: bfd_arch_i386,
242: bfd_mach_i386_i8086,
243: "i8086",
244: "i8086",
245: 3,
246: FALSE,
247: bfd_i386_compatible,
248: bfd_default_scan,
249: bfd_arch_i386_short_nop_fill,
250: &bfd_i386_arch_intel_syntax
251: };
252:
253: static const bfd_arch_info_type bfd_x64_32_arch =
254: {
255: 64, /* 64 bits in a word */
256: 64, /* 64 bits in an address */
257: 8, /* 8 bits in a byte */
258: bfd_arch_i386,
259: bfd_mach_x64_32,
260: "i386",
261: "i386:x64-32",
262: 3,
263: FALSE,
264: bfd_i386_compatible,
265: bfd_default_scan,
266: bfd_arch_i386_long_nop_fill,
267: &i8086_arch
268: };
269:
270: static const bfd_arch_info_type bfd_x86_64_arch =
271: {
272: 64, /* 64 bits in a word */
273: 64, /* 64 bits in an address */
274: 8, /* 8 bits in a byte */
275: bfd_arch_i386,
276: bfd_mach_x86_64,
277: "i386",
278: "i386:x86-64",
279: 3,
280: FALSE,
281: bfd_i386_compatible,
282: bfd_default_scan,
283: bfd_arch_i386_long_nop_fill,
284: &bfd_x64_32_arch
285: };
286:
287: const bfd_arch_info_type bfd_i386_arch =
288: {
289: 32, /* 32 bits in a word */
290: 32, /* 32 bits in an address */
291: 8, /* 8 bits in a byte */
292: bfd_arch_i386,
293: bfd_mach_i386_i386,
294: "i386",
295: "i386",
296: 3,
297: TRUE,
298: bfd_i386_compatible,
299: bfd_default_scan,
300: bfd_arch_i386_short_nop_fill,
301: &bfd_x86_64_arch
302: };
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