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e53bef9f | 1 | /* Target-dependent code for AMD64. |
ce0eebec | 2 | |
618f726f | 3 | Copyright (C) 2001-2016 Free Software Foundation, Inc. |
5ae96ec1 MK |
4 | |
5 | Contributed by Jiri Smid, SuSE Labs. | |
53e95fcf JS |
6 | |
7 | This file is part of GDB. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 11 | the Free Software Foundation; either version 3 of the License, or |
53e95fcf JS |
12 | (at your option) any later version. |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
53e95fcf JS |
21 | |
22 | #include "defs.h" | |
35669430 DE |
23 | #include "opcode/i386.h" |
24 | #include "dis-asm.h" | |
c4f35dd8 MK |
25 | #include "arch-utils.h" |
26 | #include "block.h" | |
27 | #include "dummy-frame.h" | |
28 | #include "frame.h" | |
29 | #include "frame-base.h" | |
30 | #include "frame-unwind.h" | |
53e95fcf | 31 | #include "inferior.h" |
45741a9c | 32 | #include "infrun.h" |
53e95fcf | 33 | #include "gdbcmd.h" |
c4f35dd8 MK |
34 | #include "gdbcore.h" |
35 | #include "objfiles.h" | |
53e95fcf | 36 | #include "regcache.h" |
2c261fae | 37 | #include "regset.h" |
53e95fcf | 38 | #include "symfile.h" |
eda5a4d7 | 39 | #include "disasm.h" |
9c1488cb | 40 | #include "amd64-tdep.h" |
c4f35dd8 | 41 | #include "i387-tdep.h" |
97de3545 | 42 | #include "x86-xstate.h" |
53e95fcf | 43 | |
90884b2b | 44 | #include "features/i386/amd64.c" |
a055a187 | 45 | #include "features/i386/amd64-avx.c" |
e43e105e | 46 | #include "features/i386/amd64-mpx.c" |
01f9f808 MS |
47 | #include "features/i386/amd64-avx512.c" |
48 | ||
ac1438b5 L |
49 | #include "features/i386/x32.c" |
50 | #include "features/i386/x32-avx.c" | |
01f9f808 | 51 | #include "features/i386/x32-avx512.c" |
90884b2b | 52 | |
6710bf39 SS |
53 | #include "ax.h" |
54 | #include "ax-gdb.h" | |
55 | ||
e53bef9f MK |
56 | /* Note that the AMD64 architecture was previously known as x86-64. |
57 | The latter is (forever) engraved into the canonical system name as | |
90f90721 | 58 | returned by config.guess, and used as the name for the AMD64 port |
e53bef9f MK |
59 | of GNU/Linux. The BSD's have renamed their ports to amd64; they |
60 | don't like to shout. For GDB we prefer the amd64_-prefix over the | |
61 | x86_64_-prefix since it's so much easier to type. */ | |
62 | ||
402ecd56 | 63 | /* Register information. */ |
c4f35dd8 | 64 | |
6707b003 | 65 | static const char *amd64_register_names[] = |
de220d0f | 66 | { |
6707b003 | 67 | "rax", "rbx", "rcx", "rdx", "rsi", "rdi", "rbp", "rsp", |
c4f35dd8 MK |
68 | |
69 | /* %r8 is indeed register number 8. */ | |
6707b003 UW |
70 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", |
71 | "rip", "eflags", "cs", "ss", "ds", "es", "fs", "gs", | |
c4f35dd8 | 72 | |
af233647 | 73 | /* %st0 is register number 24. */ |
6707b003 UW |
74 | "st0", "st1", "st2", "st3", "st4", "st5", "st6", "st7", |
75 | "fctrl", "fstat", "ftag", "fiseg", "fioff", "foseg", "fooff", "fop", | |
c4f35dd8 | 76 | |
af233647 | 77 | /* %xmm0 is register number 40. */ |
6707b003 UW |
78 | "xmm0", "xmm1", "xmm2", "xmm3", "xmm4", "xmm5", "xmm6", "xmm7", |
79 | "xmm8", "xmm9", "xmm10", "xmm11", "xmm12", "xmm13", "xmm14", "xmm15", | |
80 | "mxcsr", | |
0e04a514 ML |
81 | }; |
82 | ||
a055a187 L |
83 | static const char *amd64_ymm_names[] = |
84 | { | |
85 | "ymm0", "ymm1", "ymm2", "ymm3", | |
86 | "ymm4", "ymm5", "ymm6", "ymm7", | |
87 | "ymm8", "ymm9", "ymm10", "ymm11", | |
88 | "ymm12", "ymm13", "ymm14", "ymm15" | |
89 | }; | |
90 | ||
01f9f808 MS |
91 | static const char *amd64_ymm_avx512_names[] = |
92 | { | |
93 | "ymm16", "ymm17", "ymm18", "ymm19", | |
94 | "ymm20", "ymm21", "ymm22", "ymm23", | |
95 | "ymm24", "ymm25", "ymm26", "ymm27", | |
96 | "ymm28", "ymm29", "ymm30", "ymm31" | |
97 | }; | |
98 | ||
a055a187 L |
99 | static const char *amd64_ymmh_names[] = |
100 | { | |
101 | "ymm0h", "ymm1h", "ymm2h", "ymm3h", | |
102 | "ymm4h", "ymm5h", "ymm6h", "ymm7h", | |
103 | "ymm8h", "ymm9h", "ymm10h", "ymm11h", | |
104 | "ymm12h", "ymm13h", "ymm14h", "ymm15h" | |
105 | }; | |
de220d0f | 106 | |
01f9f808 MS |
107 | static const char *amd64_ymmh_avx512_names[] = |
108 | { | |
109 | "ymm16h", "ymm17h", "ymm18h", "ymm19h", | |
110 | "ymm20h", "ymm21h", "ymm22h", "ymm23h", | |
111 | "ymm24h", "ymm25h", "ymm26h", "ymm27h", | |
112 | "ymm28h", "ymm29h", "ymm30h", "ymm31h" | |
113 | }; | |
114 | ||
e43e105e WT |
115 | static const char *amd64_mpx_names[] = |
116 | { | |
117 | "bnd0raw", "bnd1raw", "bnd2raw", "bnd3raw", "bndcfgu", "bndstatus" | |
118 | }; | |
119 | ||
01f9f808 MS |
120 | static const char *amd64_k_names[] = |
121 | { | |
122 | "k0", "k1", "k2", "k3", | |
123 | "k4", "k5", "k6", "k7" | |
124 | }; | |
125 | ||
126 | static const char *amd64_zmmh_names[] = | |
127 | { | |
128 | "zmm0h", "zmm1h", "zmm2h", "zmm3h", | |
129 | "zmm4h", "zmm5h", "zmm6h", "zmm7h", | |
130 | "zmm8h", "zmm9h", "zmm10h", "zmm11h", | |
131 | "zmm12h", "zmm13h", "zmm14h", "zmm15h", | |
132 | "zmm16h", "zmm17h", "zmm18h", "zmm19h", | |
133 | "zmm20h", "zmm21h", "zmm22h", "zmm23h", | |
134 | "zmm24h", "zmm25h", "zmm26h", "zmm27h", | |
135 | "zmm28h", "zmm29h", "zmm30h", "zmm31h" | |
136 | }; | |
137 | ||
138 | static const char *amd64_zmm_names[] = | |
139 | { | |
140 | "zmm0", "zmm1", "zmm2", "zmm3", | |
141 | "zmm4", "zmm5", "zmm6", "zmm7", | |
142 | "zmm8", "zmm9", "zmm10", "zmm11", | |
143 | "zmm12", "zmm13", "zmm14", "zmm15", | |
144 | "zmm16", "zmm17", "zmm18", "zmm19", | |
145 | "zmm20", "zmm21", "zmm22", "zmm23", | |
146 | "zmm24", "zmm25", "zmm26", "zmm27", | |
147 | "zmm28", "zmm29", "zmm30", "zmm31" | |
148 | }; | |
149 | ||
150 | static const char *amd64_xmm_avx512_names[] = { | |
151 | "xmm16", "xmm17", "xmm18", "xmm19", | |
152 | "xmm20", "xmm21", "xmm22", "xmm23", | |
153 | "xmm24", "xmm25", "xmm26", "xmm27", | |
154 | "xmm28", "xmm29", "xmm30", "xmm31" | |
155 | }; | |
156 | ||
c4f35dd8 MK |
157 | /* DWARF Register Number Mapping as defined in the System V psABI, |
158 | section 3.6. */ | |
53e95fcf | 159 | |
e53bef9f | 160 | static int amd64_dwarf_regmap[] = |
0e04a514 | 161 | { |
c4f35dd8 | 162 | /* General Purpose Registers RAX, RDX, RCX, RBX, RSI, RDI. */ |
90f90721 MK |
163 | AMD64_RAX_REGNUM, AMD64_RDX_REGNUM, |
164 | AMD64_RCX_REGNUM, AMD64_RBX_REGNUM, | |
165 | AMD64_RSI_REGNUM, AMD64_RDI_REGNUM, | |
c4f35dd8 MK |
166 | |
167 | /* Frame Pointer Register RBP. */ | |
90f90721 | 168 | AMD64_RBP_REGNUM, |
c4f35dd8 MK |
169 | |
170 | /* Stack Pointer Register RSP. */ | |
90f90721 | 171 | AMD64_RSP_REGNUM, |
c4f35dd8 MK |
172 | |
173 | /* Extended Integer Registers 8 - 15. */ | |
5b856f36 PM |
174 | AMD64_R8_REGNUM, /* %r8 */ |
175 | AMD64_R9_REGNUM, /* %r9 */ | |
176 | AMD64_R10_REGNUM, /* %r10 */ | |
177 | AMD64_R11_REGNUM, /* %r11 */ | |
178 | AMD64_R12_REGNUM, /* %r12 */ | |
179 | AMD64_R13_REGNUM, /* %r13 */ | |
180 | AMD64_R14_REGNUM, /* %r14 */ | |
181 | AMD64_R15_REGNUM, /* %r15 */ | |
c4f35dd8 | 182 | |
59207364 | 183 | /* Return Address RA. Mapped to RIP. */ |
90f90721 | 184 | AMD64_RIP_REGNUM, |
c4f35dd8 MK |
185 | |
186 | /* SSE Registers 0 - 7. */ | |
90f90721 MK |
187 | AMD64_XMM0_REGNUM + 0, AMD64_XMM1_REGNUM, |
188 | AMD64_XMM0_REGNUM + 2, AMD64_XMM0_REGNUM + 3, | |
189 | AMD64_XMM0_REGNUM + 4, AMD64_XMM0_REGNUM + 5, | |
190 | AMD64_XMM0_REGNUM + 6, AMD64_XMM0_REGNUM + 7, | |
c4f35dd8 MK |
191 | |
192 | /* Extended SSE Registers 8 - 15. */ | |
90f90721 MK |
193 | AMD64_XMM0_REGNUM + 8, AMD64_XMM0_REGNUM + 9, |
194 | AMD64_XMM0_REGNUM + 10, AMD64_XMM0_REGNUM + 11, | |
195 | AMD64_XMM0_REGNUM + 12, AMD64_XMM0_REGNUM + 13, | |
196 | AMD64_XMM0_REGNUM + 14, AMD64_XMM0_REGNUM + 15, | |
c4f35dd8 MK |
197 | |
198 | /* Floating Point Registers 0-7. */ | |
90f90721 MK |
199 | AMD64_ST0_REGNUM + 0, AMD64_ST0_REGNUM + 1, |
200 | AMD64_ST0_REGNUM + 2, AMD64_ST0_REGNUM + 3, | |
201 | AMD64_ST0_REGNUM + 4, AMD64_ST0_REGNUM + 5, | |
c6f4c129 | 202 | AMD64_ST0_REGNUM + 6, AMD64_ST0_REGNUM + 7, |
f7ca3fcf PM |
203 | |
204 | /* MMX Registers 0 - 7. | |
205 | We have to handle those registers specifically, as their register | |
206 | number within GDB depends on the target (or they may even not be | |
207 | available at all). */ | |
208 | -1, -1, -1, -1, -1, -1, -1, -1, | |
209 | ||
c6f4c129 JB |
210 | /* Control and Status Flags Register. */ |
211 | AMD64_EFLAGS_REGNUM, | |
212 | ||
213 | /* Selector Registers. */ | |
214 | AMD64_ES_REGNUM, | |
215 | AMD64_CS_REGNUM, | |
216 | AMD64_SS_REGNUM, | |
217 | AMD64_DS_REGNUM, | |
218 | AMD64_FS_REGNUM, | |
219 | AMD64_GS_REGNUM, | |
220 | -1, | |
221 | -1, | |
222 | ||
223 | /* Segment Base Address Registers. */ | |
224 | -1, | |
225 | -1, | |
226 | -1, | |
227 | -1, | |
228 | ||
229 | /* Special Selector Registers. */ | |
230 | -1, | |
231 | -1, | |
232 | ||
233 | /* Floating Point Control Registers. */ | |
234 | AMD64_MXCSR_REGNUM, | |
235 | AMD64_FCTRL_REGNUM, | |
236 | AMD64_FSTAT_REGNUM | |
c4f35dd8 | 237 | }; |
0e04a514 | 238 | |
e53bef9f MK |
239 | static const int amd64_dwarf_regmap_len = |
240 | (sizeof (amd64_dwarf_regmap) / sizeof (amd64_dwarf_regmap[0])); | |
0e04a514 | 241 | |
c4f35dd8 MK |
242 | /* Convert DWARF register number REG to the appropriate register |
243 | number used by GDB. */ | |
26abbdc4 | 244 | |
c4f35dd8 | 245 | static int |
d3f73121 | 246 | amd64_dwarf_reg_to_regnum (struct gdbarch *gdbarch, int reg) |
53e95fcf | 247 | { |
a055a187 L |
248 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
249 | int ymm0_regnum = tdep->ymm0_regnum; | |
c4f35dd8 | 250 | int regnum = -1; |
53e95fcf | 251 | |
16aff9a6 | 252 | if (reg >= 0 && reg < amd64_dwarf_regmap_len) |
e53bef9f | 253 | regnum = amd64_dwarf_regmap[reg]; |
53e95fcf | 254 | |
0fde2c53 | 255 | if (ymm0_regnum >= 0 |
a055a187 L |
256 | && i386_xmm_regnum_p (gdbarch, regnum)) |
257 | regnum += ymm0_regnum - I387_XMM0_REGNUM (tdep); | |
c4f35dd8 MK |
258 | |
259 | return regnum; | |
53e95fcf | 260 | } |
d532c08f | 261 | |
35669430 DE |
262 | /* Map architectural register numbers to gdb register numbers. */ |
263 | ||
264 | static const int amd64_arch_regmap[16] = | |
265 | { | |
266 | AMD64_RAX_REGNUM, /* %rax */ | |
267 | AMD64_RCX_REGNUM, /* %rcx */ | |
268 | AMD64_RDX_REGNUM, /* %rdx */ | |
269 | AMD64_RBX_REGNUM, /* %rbx */ | |
270 | AMD64_RSP_REGNUM, /* %rsp */ | |
271 | AMD64_RBP_REGNUM, /* %rbp */ | |
272 | AMD64_RSI_REGNUM, /* %rsi */ | |
273 | AMD64_RDI_REGNUM, /* %rdi */ | |
274 | AMD64_R8_REGNUM, /* %r8 */ | |
275 | AMD64_R9_REGNUM, /* %r9 */ | |
276 | AMD64_R10_REGNUM, /* %r10 */ | |
277 | AMD64_R11_REGNUM, /* %r11 */ | |
278 | AMD64_R12_REGNUM, /* %r12 */ | |
279 | AMD64_R13_REGNUM, /* %r13 */ | |
280 | AMD64_R14_REGNUM, /* %r14 */ | |
281 | AMD64_R15_REGNUM /* %r15 */ | |
282 | }; | |
283 | ||
284 | static const int amd64_arch_regmap_len = | |
285 | (sizeof (amd64_arch_regmap) / sizeof (amd64_arch_regmap[0])); | |
286 | ||
287 | /* Convert architectural register number REG to the appropriate register | |
288 | number used by GDB. */ | |
289 | ||
290 | static int | |
291 | amd64_arch_reg_to_regnum (int reg) | |
292 | { | |
293 | gdb_assert (reg >= 0 && reg < amd64_arch_regmap_len); | |
294 | ||
295 | return amd64_arch_regmap[reg]; | |
296 | } | |
297 | ||
1ba53b71 L |
298 | /* Register names for byte pseudo-registers. */ |
299 | ||
300 | static const char *amd64_byte_names[] = | |
301 | { | |
302 | "al", "bl", "cl", "dl", "sil", "dil", "bpl", "spl", | |
fe01d668 L |
303 | "r8l", "r9l", "r10l", "r11l", "r12l", "r13l", "r14l", "r15l", |
304 | "ah", "bh", "ch", "dh" | |
1ba53b71 L |
305 | }; |
306 | ||
fe01d668 L |
307 | /* Number of lower byte registers. */ |
308 | #define AMD64_NUM_LOWER_BYTE_REGS 16 | |
309 | ||
1ba53b71 L |
310 | /* Register names for word pseudo-registers. */ |
311 | ||
312 | static const char *amd64_word_names[] = | |
313 | { | |
9cad29ac | 314 | "ax", "bx", "cx", "dx", "si", "di", "bp", "", |
1ba53b71 L |
315 | "r8w", "r9w", "r10w", "r11w", "r12w", "r13w", "r14w", "r15w" |
316 | }; | |
317 | ||
318 | /* Register names for dword pseudo-registers. */ | |
319 | ||
320 | static const char *amd64_dword_names[] = | |
321 | { | |
322 | "eax", "ebx", "ecx", "edx", "esi", "edi", "ebp", "esp", | |
fff4548b MK |
323 | "r8d", "r9d", "r10d", "r11d", "r12d", "r13d", "r14d", "r15d", |
324 | "eip" | |
1ba53b71 L |
325 | }; |
326 | ||
327 | /* Return the name of register REGNUM. */ | |
328 | ||
329 | static const char * | |
330 | amd64_pseudo_register_name (struct gdbarch *gdbarch, int regnum) | |
331 | { | |
332 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
333 | if (i386_byte_regnum_p (gdbarch, regnum)) | |
334 | return amd64_byte_names[regnum - tdep->al_regnum]; | |
01f9f808 MS |
335 | else if (i386_zmm_regnum_p (gdbarch, regnum)) |
336 | return amd64_zmm_names[regnum - tdep->zmm0_regnum]; | |
a055a187 L |
337 | else if (i386_ymm_regnum_p (gdbarch, regnum)) |
338 | return amd64_ymm_names[regnum - tdep->ymm0_regnum]; | |
01f9f808 MS |
339 | else if (i386_ymm_avx512_regnum_p (gdbarch, regnum)) |
340 | return amd64_ymm_avx512_names[regnum - tdep->ymm16_regnum]; | |
1ba53b71 L |
341 | else if (i386_word_regnum_p (gdbarch, regnum)) |
342 | return amd64_word_names[regnum - tdep->ax_regnum]; | |
343 | else if (i386_dword_regnum_p (gdbarch, regnum)) | |
344 | return amd64_dword_names[regnum - tdep->eax_regnum]; | |
345 | else | |
346 | return i386_pseudo_register_name (gdbarch, regnum); | |
347 | } | |
348 | ||
3543a589 TT |
349 | static struct value * |
350 | amd64_pseudo_register_read_value (struct gdbarch *gdbarch, | |
351 | struct regcache *regcache, | |
352 | int regnum) | |
1ba53b71 L |
353 | { |
354 | gdb_byte raw_buf[MAX_REGISTER_SIZE]; | |
355 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
05d1431c | 356 | enum register_status status; |
3543a589 TT |
357 | struct value *result_value; |
358 | gdb_byte *buf; | |
359 | ||
360 | result_value = allocate_value (register_type (gdbarch, regnum)); | |
361 | VALUE_LVAL (result_value) = lval_register; | |
362 | VALUE_REGNUM (result_value) = regnum; | |
363 | buf = value_contents_raw (result_value); | |
1ba53b71 L |
364 | |
365 | if (i386_byte_regnum_p (gdbarch, regnum)) | |
366 | { | |
367 | int gpnum = regnum - tdep->al_regnum; | |
368 | ||
369 | /* Extract (always little endian). */ | |
fe01d668 L |
370 | if (gpnum >= AMD64_NUM_LOWER_BYTE_REGS) |
371 | { | |
372 | /* Special handling for AH, BH, CH, DH. */ | |
05d1431c PA |
373 | status = regcache_raw_read (regcache, |
374 | gpnum - AMD64_NUM_LOWER_BYTE_REGS, | |
375 | raw_buf); | |
376 | if (status == REG_VALID) | |
377 | memcpy (buf, raw_buf + 1, 1); | |
3543a589 TT |
378 | else |
379 | mark_value_bytes_unavailable (result_value, 0, | |
380 | TYPE_LENGTH (value_type (result_value))); | |
fe01d668 L |
381 | } |
382 | else | |
383 | { | |
05d1431c PA |
384 | status = regcache_raw_read (regcache, gpnum, raw_buf); |
385 | if (status == REG_VALID) | |
386 | memcpy (buf, raw_buf, 1); | |
3543a589 TT |
387 | else |
388 | mark_value_bytes_unavailable (result_value, 0, | |
389 | TYPE_LENGTH (value_type (result_value))); | |
fe01d668 | 390 | } |
1ba53b71 L |
391 | } |
392 | else if (i386_dword_regnum_p (gdbarch, regnum)) | |
393 | { | |
394 | int gpnum = regnum - tdep->eax_regnum; | |
395 | /* Extract (always little endian). */ | |
05d1431c PA |
396 | status = regcache_raw_read (regcache, gpnum, raw_buf); |
397 | if (status == REG_VALID) | |
398 | memcpy (buf, raw_buf, 4); | |
3543a589 TT |
399 | else |
400 | mark_value_bytes_unavailable (result_value, 0, | |
401 | TYPE_LENGTH (value_type (result_value))); | |
1ba53b71 L |
402 | } |
403 | else | |
3543a589 TT |
404 | i386_pseudo_register_read_into_value (gdbarch, regcache, regnum, |
405 | result_value); | |
406 | ||
407 | return result_value; | |
1ba53b71 L |
408 | } |
409 | ||
410 | static void | |
411 | amd64_pseudo_register_write (struct gdbarch *gdbarch, | |
412 | struct regcache *regcache, | |
413 | int regnum, const gdb_byte *buf) | |
414 | { | |
415 | gdb_byte raw_buf[MAX_REGISTER_SIZE]; | |
416 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
417 | ||
418 | if (i386_byte_regnum_p (gdbarch, regnum)) | |
419 | { | |
420 | int gpnum = regnum - tdep->al_regnum; | |
421 | ||
fe01d668 L |
422 | if (gpnum >= AMD64_NUM_LOWER_BYTE_REGS) |
423 | { | |
424 | /* Read ... AH, BH, CH, DH. */ | |
425 | regcache_raw_read (regcache, | |
426 | gpnum - AMD64_NUM_LOWER_BYTE_REGS, raw_buf); | |
427 | /* ... Modify ... (always little endian). */ | |
428 | memcpy (raw_buf + 1, buf, 1); | |
429 | /* ... Write. */ | |
430 | regcache_raw_write (regcache, | |
431 | gpnum - AMD64_NUM_LOWER_BYTE_REGS, raw_buf); | |
432 | } | |
433 | else | |
434 | { | |
435 | /* Read ... */ | |
436 | regcache_raw_read (regcache, gpnum, raw_buf); | |
437 | /* ... Modify ... (always little endian). */ | |
438 | memcpy (raw_buf, buf, 1); | |
439 | /* ... Write. */ | |
440 | regcache_raw_write (regcache, gpnum, raw_buf); | |
441 | } | |
1ba53b71 L |
442 | } |
443 | else if (i386_dword_regnum_p (gdbarch, regnum)) | |
444 | { | |
445 | int gpnum = regnum - tdep->eax_regnum; | |
446 | ||
447 | /* Read ... */ | |
448 | regcache_raw_read (regcache, gpnum, raw_buf); | |
449 | /* ... Modify ... (always little endian). */ | |
450 | memcpy (raw_buf, buf, 4); | |
451 | /* ... Write. */ | |
452 | regcache_raw_write (regcache, gpnum, raw_buf); | |
453 | } | |
454 | else | |
455 | i386_pseudo_register_write (gdbarch, regcache, regnum, buf); | |
456 | } | |
457 | ||
62e5fd57 MK |
458 | /* Implement the 'ax_pseudo_register_collect' gdbarch method. */ |
459 | ||
460 | static int | |
461 | amd64_ax_pseudo_register_collect (struct gdbarch *gdbarch, | |
462 | struct agent_expr *ax, int regnum) | |
463 | { | |
464 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
465 | ||
466 | if (i386_byte_regnum_p (gdbarch, regnum)) | |
467 | { | |
468 | int gpnum = regnum - tdep->al_regnum; | |
469 | ||
470 | if (gpnum >= AMD64_NUM_LOWER_BYTE_REGS) | |
471 | ax_reg_mask (ax, gpnum - AMD64_NUM_LOWER_BYTE_REGS); | |
472 | else | |
473 | ax_reg_mask (ax, gpnum); | |
474 | return 0; | |
475 | } | |
476 | else if (i386_dword_regnum_p (gdbarch, regnum)) | |
477 | { | |
478 | int gpnum = regnum - tdep->eax_regnum; | |
479 | ||
480 | ax_reg_mask (ax, gpnum); | |
481 | return 0; | |
482 | } | |
483 | else | |
484 | return i386_ax_pseudo_register_collect (gdbarch, ax, regnum); | |
485 | } | |
486 | ||
53e95fcf JS |
487 | \f |
488 | ||
bf4d6c1c JB |
489 | /* Register classes as defined in the psABI. */ |
490 | ||
491 | enum amd64_reg_class | |
492 | { | |
493 | AMD64_INTEGER, | |
494 | AMD64_SSE, | |
495 | AMD64_SSEUP, | |
496 | AMD64_X87, | |
497 | AMD64_X87UP, | |
498 | AMD64_COMPLEX_X87, | |
499 | AMD64_NO_CLASS, | |
500 | AMD64_MEMORY | |
501 | }; | |
502 | ||
efb1c01c MK |
503 | /* Return the union class of CLASS1 and CLASS2. See the psABI for |
504 | details. */ | |
505 | ||
506 | static enum amd64_reg_class | |
507 | amd64_merge_classes (enum amd64_reg_class class1, enum amd64_reg_class class2) | |
508 | { | |
509 | /* Rule (a): If both classes are equal, this is the resulting class. */ | |
510 | if (class1 == class2) | |
511 | return class1; | |
512 | ||
513 | /* Rule (b): If one of the classes is NO_CLASS, the resulting class | |
514 | is the other class. */ | |
515 | if (class1 == AMD64_NO_CLASS) | |
516 | return class2; | |
517 | if (class2 == AMD64_NO_CLASS) | |
518 | return class1; | |
519 | ||
520 | /* Rule (c): If one of the classes is MEMORY, the result is MEMORY. */ | |
521 | if (class1 == AMD64_MEMORY || class2 == AMD64_MEMORY) | |
522 | return AMD64_MEMORY; | |
523 | ||
524 | /* Rule (d): If one of the classes is INTEGER, the result is INTEGER. */ | |
525 | if (class1 == AMD64_INTEGER || class2 == AMD64_INTEGER) | |
526 | return AMD64_INTEGER; | |
527 | ||
528 | /* Rule (e): If one of the classes is X87, X87UP, COMPLEX_X87 class, | |
529 | MEMORY is used as class. */ | |
530 | if (class1 == AMD64_X87 || class1 == AMD64_X87UP | |
531 | || class1 == AMD64_COMPLEX_X87 || class2 == AMD64_X87 | |
532 | || class2 == AMD64_X87UP || class2 == AMD64_COMPLEX_X87) | |
533 | return AMD64_MEMORY; | |
534 | ||
535 | /* Rule (f): Otherwise class SSE is used. */ | |
536 | return AMD64_SSE; | |
537 | } | |
538 | ||
fe978cb0 | 539 | static void amd64_classify (struct type *type, enum amd64_reg_class theclass[2]); |
bf4d6c1c | 540 | |
79b1ab3d MK |
541 | /* Return non-zero if TYPE is a non-POD structure or union type. */ |
542 | ||
543 | static int | |
544 | amd64_non_pod_p (struct type *type) | |
545 | { | |
546 | /* ??? A class with a base class certainly isn't POD, but does this | |
547 | catch all non-POD structure types? */ | |
548 | if (TYPE_CODE (type) == TYPE_CODE_STRUCT && TYPE_N_BASECLASSES (type) > 0) | |
549 | return 1; | |
550 | ||
551 | return 0; | |
552 | } | |
553 | ||
efb1c01c MK |
554 | /* Classify TYPE according to the rules for aggregate (structures and |
555 | arrays) and union types, and store the result in CLASS. */ | |
c4f35dd8 MK |
556 | |
557 | static void | |
fe978cb0 | 558 | amd64_classify_aggregate (struct type *type, enum amd64_reg_class theclass[2]) |
53e95fcf | 559 | { |
efb1c01c MK |
560 | /* 1. If the size of an object is larger than two eightbytes, or in |
561 | C++, is a non-POD structure or union type, or contains | |
562 | unaligned fields, it has class memory. */ | |
744a8059 | 563 | if (TYPE_LENGTH (type) > 16 || amd64_non_pod_p (type)) |
53e95fcf | 564 | { |
fe978cb0 | 565 | theclass[0] = theclass[1] = AMD64_MEMORY; |
efb1c01c | 566 | return; |
53e95fcf | 567 | } |
efb1c01c MK |
568 | |
569 | /* 2. Both eightbytes get initialized to class NO_CLASS. */ | |
fe978cb0 | 570 | theclass[0] = theclass[1] = AMD64_NO_CLASS; |
efb1c01c MK |
571 | |
572 | /* 3. Each field of an object is classified recursively so that | |
573 | always two fields are considered. The resulting class is | |
574 | calculated according to the classes of the fields in the | |
575 | eightbyte: */ | |
576 | ||
577 | if (TYPE_CODE (type) == TYPE_CODE_ARRAY) | |
8ffd9b1b | 578 | { |
efb1c01c MK |
579 | struct type *subtype = check_typedef (TYPE_TARGET_TYPE (type)); |
580 | ||
581 | /* All fields in an array have the same type. */ | |
fe978cb0 PA |
582 | amd64_classify (subtype, theclass); |
583 | if (TYPE_LENGTH (type) > 8 && theclass[1] == AMD64_NO_CLASS) | |
584 | theclass[1] = theclass[0]; | |
8ffd9b1b | 585 | } |
53e95fcf JS |
586 | else |
587 | { | |
efb1c01c | 588 | int i; |
53e95fcf | 589 | |
efb1c01c MK |
590 | /* Structure or union. */ |
591 | gdb_assert (TYPE_CODE (type) == TYPE_CODE_STRUCT | |
592 | || TYPE_CODE (type) == TYPE_CODE_UNION); | |
593 | ||
594 | for (i = 0; i < TYPE_NFIELDS (type); i++) | |
53e95fcf | 595 | { |
efb1c01c MK |
596 | struct type *subtype = check_typedef (TYPE_FIELD_TYPE (type, i)); |
597 | int pos = TYPE_FIELD_BITPOS (type, i) / 64; | |
598 | enum amd64_reg_class subclass[2]; | |
e4e2711a JB |
599 | int bitsize = TYPE_FIELD_BITSIZE (type, i); |
600 | int endpos; | |
601 | ||
602 | if (bitsize == 0) | |
603 | bitsize = TYPE_LENGTH (subtype) * 8; | |
604 | endpos = (TYPE_FIELD_BITPOS (type, i) + bitsize - 1) / 64; | |
efb1c01c | 605 | |
562c50c2 | 606 | /* Ignore static fields. */ |
d6a843b5 | 607 | if (field_is_static (&TYPE_FIELD (type, i))) |
562c50c2 MK |
608 | continue; |
609 | ||
efb1c01c MK |
610 | gdb_assert (pos == 0 || pos == 1); |
611 | ||
612 | amd64_classify (subtype, subclass); | |
fe978cb0 | 613 | theclass[pos] = amd64_merge_classes (theclass[pos], subclass[0]); |
e4e2711a JB |
614 | if (bitsize <= 64 && pos == 0 && endpos == 1) |
615 | /* This is a bit of an odd case: We have a field that would | |
616 | normally fit in one of the two eightbytes, except that | |
617 | it is placed in a way that this field straddles them. | |
618 | This has been seen with a structure containing an array. | |
619 | ||
620 | The ABI is a bit unclear in this case, but we assume that | |
621 | this field's class (stored in subclass[0]) must also be merged | |
622 | into class[1]. In other words, our field has a piece stored | |
623 | in the second eight-byte, and thus its class applies to | |
624 | the second eight-byte as well. | |
625 | ||
626 | In the case where the field length exceeds 8 bytes, | |
627 | it should not be necessary to merge the field class | |
628 | into class[1]. As LEN > 8, subclass[1] is necessarily | |
629 | different from AMD64_NO_CLASS. If subclass[1] is equal | |
630 | to subclass[0], then the normal class[1]/subclass[1] | |
631 | merging will take care of everything. For subclass[1] | |
632 | to be different from subclass[0], I can only see the case | |
633 | where we have a SSE/SSEUP or X87/X87UP pair, which both | |
634 | use up all 16 bytes of the aggregate, and are already | |
635 | handled just fine (because each portion sits on its own | |
636 | 8-byte). */ | |
fe978cb0 | 637 | theclass[1] = amd64_merge_classes (theclass[1], subclass[0]); |
efb1c01c | 638 | if (pos == 0) |
fe978cb0 | 639 | theclass[1] = amd64_merge_classes (theclass[1], subclass[1]); |
53e95fcf | 640 | } |
53e95fcf | 641 | } |
efb1c01c MK |
642 | |
643 | /* 4. Then a post merger cleanup is done: */ | |
644 | ||
645 | /* Rule (a): If one of the classes is MEMORY, the whole argument is | |
646 | passed in memory. */ | |
fe978cb0 PA |
647 | if (theclass[0] == AMD64_MEMORY || theclass[1] == AMD64_MEMORY) |
648 | theclass[0] = theclass[1] = AMD64_MEMORY; | |
efb1c01c | 649 | |
177b42fe | 650 | /* Rule (b): If SSEUP is not preceded by SSE, it is converted to |
efb1c01c | 651 | SSE. */ |
fe978cb0 PA |
652 | if (theclass[0] == AMD64_SSEUP) |
653 | theclass[0] = AMD64_SSE; | |
654 | if (theclass[1] == AMD64_SSEUP && theclass[0] != AMD64_SSE) | |
655 | theclass[1] = AMD64_SSE; | |
efb1c01c MK |
656 | } |
657 | ||
658 | /* Classify TYPE, and store the result in CLASS. */ | |
659 | ||
bf4d6c1c | 660 | static void |
fe978cb0 | 661 | amd64_classify (struct type *type, enum amd64_reg_class theclass[2]) |
efb1c01c MK |
662 | { |
663 | enum type_code code = TYPE_CODE (type); | |
664 | int len = TYPE_LENGTH (type); | |
665 | ||
fe978cb0 | 666 | theclass[0] = theclass[1] = AMD64_NO_CLASS; |
efb1c01c MK |
667 | |
668 | /* Arguments of types (signed and unsigned) _Bool, char, short, int, | |
5a7225ed JB |
669 | long, long long, and pointers are in the INTEGER class. Similarly, |
670 | range types, used by languages such as Ada, are also in the INTEGER | |
671 | class. */ | |
efb1c01c | 672 | if ((code == TYPE_CODE_INT || code == TYPE_CODE_ENUM |
b929c77f | 673 | || code == TYPE_CODE_BOOL || code == TYPE_CODE_RANGE |
9db13498 | 674 | || code == TYPE_CODE_CHAR |
efb1c01c MK |
675 | || code == TYPE_CODE_PTR || code == TYPE_CODE_REF) |
676 | && (len == 1 || len == 2 || len == 4 || len == 8)) | |
fe978cb0 | 677 | theclass[0] = AMD64_INTEGER; |
efb1c01c | 678 | |
5daa78cc TJB |
679 | /* Arguments of types float, double, _Decimal32, _Decimal64 and __m64 |
680 | are in class SSE. */ | |
681 | else if ((code == TYPE_CODE_FLT || code == TYPE_CODE_DECFLOAT) | |
682 | && (len == 4 || len == 8)) | |
efb1c01c | 683 | /* FIXME: __m64 . */ |
fe978cb0 | 684 | theclass[0] = AMD64_SSE; |
efb1c01c | 685 | |
5daa78cc TJB |
686 | /* Arguments of types __float128, _Decimal128 and __m128 are split into |
687 | two halves. The least significant ones belong to class SSE, the most | |
efb1c01c | 688 | significant one to class SSEUP. */ |
5daa78cc TJB |
689 | else if (code == TYPE_CODE_DECFLOAT && len == 16) |
690 | /* FIXME: __float128, __m128. */ | |
fe978cb0 | 691 | theclass[0] = AMD64_SSE, theclass[1] = AMD64_SSEUP; |
efb1c01c MK |
692 | |
693 | /* The 64-bit mantissa of arguments of type long double belongs to | |
694 | class X87, the 16-bit exponent plus 6 bytes of padding belongs to | |
695 | class X87UP. */ | |
696 | else if (code == TYPE_CODE_FLT && len == 16) | |
697 | /* Class X87 and X87UP. */ | |
fe978cb0 | 698 | theclass[0] = AMD64_X87, theclass[1] = AMD64_X87UP; |
efb1c01c | 699 | |
7f7930dd MK |
700 | /* Arguments of complex T where T is one of the types float or |
701 | double get treated as if they are implemented as: | |
702 | ||
703 | struct complexT { | |
704 | T real; | |
705 | T imag; | |
5f52445b YQ |
706 | }; |
707 | ||
708 | */ | |
7f7930dd | 709 | else if (code == TYPE_CODE_COMPLEX && len == 8) |
fe978cb0 | 710 | theclass[0] = AMD64_SSE; |
7f7930dd | 711 | else if (code == TYPE_CODE_COMPLEX && len == 16) |
fe978cb0 | 712 | theclass[0] = theclass[1] = AMD64_SSE; |
7f7930dd MK |
713 | |
714 | /* A variable of type complex long double is classified as type | |
715 | COMPLEX_X87. */ | |
716 | else if (code == TYPE_CODE_COMPLEX && len == 32) | |
fe978cb0 | 717 | theclass[0] = AMD64_COMPLEX_X87; |
7f7930dd | 718 | |
efb1c01c MK |
719 | /* Aggregates. */ |
720 | else if (code == TYPE_CODE_ARRAY || code == TYPE_CODE_STRUCT | |
721 | || code == TYPE_CODE_UNION) | |
fe978cb0 | 722 | amd64_classify_aggregate (type, theclass); |
efb1c01c MK |
723 | } |
724 | ||
725 | static enum return_value_convention | |
6a3a010b | 726 | amd64_return_value (struct gdbarch *gdbarch, struct value *function, |
c055b101 | 727 | struct type *type, struct regcache *regcache, |
42835c2b | 728 | gdb_byte *readbuf, const gdb_byte *writebuf) |
efb1c01c | 729 | { |
fe978cb0 | 730 | enum amd64_reg_class theclass[2]; |
efb1c01c | 731 | int len = TYPE_LENGTH (type); |
90f90721 MK |
732 | static int integer_regnum[] = { AMD64_RAX_REGNUM, AMD64_RDX_REGNUM }; |
733 | static int sse_regnum[] = { AMD64_XMM0_REGNUM, AMD64_XMM1_REGNUM }; | |
efb1c01c MK |
734 | int integer_reg = 0; |
735 | int sse_reg = 0; | |
736 | int i; | |
737 | ||
738 | gdb_assert (!(readbuf && writebuf)); | |
739 | ||
740 | /* 1. Classify the return type with the classification algorithm. */ | |
fe978cb0 | 741 | amd64_classify (type, theclass); |
efb1c01c MK |
742 | |
743 | /* 2. If the type has class MEMORY, then the caller provides space | |
6fa57a7d | 744 | for the return value and passes the address of this storage in |
0963b4bd | 745 | %rdi as if it were the first argument to the function. In effect, |
6fa57a7d MK |
746 | this address becomes a hidden first argument. |
747 | ||
748 | On return %rax will contain the address that has been passed in | |
749 | by the caller in %rdi. */ | |
fe978cb0 | 750 | if (theclass[0] == AMD64_MEMORY) |
6fa57a7d MK |
751 | { |
752 | /* As indicated by the comment above, the ABI guarantees that we | |
753 | can always find the return value just after the function has | |
754 | returned. */ | |
755 | ||
756 | if (readbuf) | |
757 | { | |
758 | ULONGEST addr; | |
759 | ||
760 | regcache_raw_read_unsigned (regcache, AMD64_RAX_REGNUM, &addr); | |
761 | read_memory (addr, readbuf, TYPE_LENGTH (type)); | |
762 | } | |
763 | ||
764 | return RETURN_VALUE_ABI_RETURNS_ADDRESS; | |
765 | } | |
efb1c01c | 766 | |
7f7930dd MK |
767 | /* 8. If the class is COMPLEX_X87, the real part of the value is |
768 | returned in %st0 and the imaginary part in %st1. */ | |
fe978cb0 | 769 | if (theclass[0] == AMD64_COMPLEX_X87) |
7f7930dd MK |
770 | { |
771 | if (readbuf) | |
772 | { | |
773 | regcache_raw_read (regcache, AMD64_ST0_REGNUM, readbuf); | |
774 | regcache_raw_read (regcache, AMD64_ST1_REGNUM, readbuf + 16); | |
775 | } | |
776 | ||
777 | if (writebuf) | |
778 | { | |
779 | i387_return_value (gdbarch, regcache); | |
780 | regcache_raw_write (regcache, AMD64_ST0_REGNUM, writebuf); | |
781 | regcache_raw_write (regcache, AMD64_ST1_REGNUM, writebuf + 16); | |
782 | ||
783 | /* Fix up the tag word such that both %st(0) and %st(1) are | |
784 | marked as valid. */ | |
785 | regcache_raw_write_unsigned (regcache, AMD64_FTAG_REGNUM, 0xfff); | |
786 | } | |
787 | ||
788 | return RETURN_VALUE_REGISTER_CONVENTION; | |
789 | } | |
790 | ||
fe978cb0 | 791 | gdb_assert (theclass[1] != AMD64_MEMORY); |
bad43aa5 | 792 | gdb_assert (len <= 16); |
efb1c01c MK |
793 | |
794 | for (i = 0; len > 0; i++, len -= 8) | |
795 | { | |
796 | int regnum = -1; | |
797 | int offset = 0; | |
798 | ||
fe978cb0 | 799 | switch (theclass[i]) |
efb1c01c MK |
800 | { |
801 | case AMD64_INTEGER: | |
802 | /* 3. If the class is INTEGER, the next available register | |
803 | of the sequence %rax, %rdx is used. */ | |
804 | regnum = integer_regnum[integer_reg++]; | |
805 | break; | |
806 | ||
807 | case AMD64_SSE: | |
808 | /* 4. If the class is SSE, the next available SSE register | |
809 | of the sequence %xmm0, %xmm1 is used. */ | |
810 | regnum = sse_regnum[sse_reg++]; | |
811 | break; | |
812 | ||
813 | case AMD64_SSEUP: | |
814 | /* 5. If the class is SSEUP, the eightbyte is passed in the | |
815 | upper half of the last used SSE register. */ | |
816 | gdb_assert (sse_reg > 0); | |
817 | regnum = sse_regnum[sse_reg - 1]; | |
818 | offset = 8; | |
819 | break; | |
820 | ||
821 | case AMD64_X87: | |
822 | /* 6. If the class is X87, the value is returned on the X87 | |
823 | stack in %st0 as 80-bit x87 number. */ | |
90f90721 | 824 | regnum = AMD64_ST0_REGNUM; |
efb1c01c MK |
825 | if (writebuf) |
826 | i387_return_value (gdbarch, regcache); | |
827 | break; | |
828 | ||
829 | case AMD64_X87UP: | |
830 | /* 7. If the class is X87UP, the value is returned together | |
831 | with the previous X87 value in %st0. */ | |
fe978cb0 | 832 | gdb_assert (i > 0 && theclass[0] == AMD64_X87); |
90f90721 | 833 | regnum = AMD64_ST0_REGNUM; |
efb1c01c MK |
834 | offset = 8; |
835 | len = 2; | |
836 | break; | |
837 | ||
838 | case AMD64_NO_CLASS: | |
839 | continue; | |
840 | ||
841 | default: | |
842 | gdb_assert (!"Unexpected register class."); | |
843 | } | |
844 | ||
845 | gdb_assert (regnum != -1); | |
846 | ||
847 | if (readbuf) | |
848 | regcache_raw_read_part (regcache, regnum, offset, min (len, 8), | |
42835c2b | 849 | readbuf + i * 8); |
efb1c01c MK |
850 | if (writebuf) |
851 | regcache_raw_write_part (regcache, regnum, offset, min (len, 8), | |
42835c2b | 852 | writebuf + i * 8); |
efb1c01c MK |
853 | } |
854 | ||
855 | return RETURN_VALUE_REGISTER_CONVENTION; | |
53e95fcf JS |
856 | } |
857 | \f | |
858 | ||
720aa428 MK |
859 | static CORE_ADDR |
860 | amd64_push_arguments (struct regcache *regcache, int nargs, | |
6470d250 | 861 | struct value **args, CORE_ADDR sp, int struct_return) |
720aa428 | 862 | { |
bf4d6c1c JB |
863 | static int integer_regnum[] = |
864 | { | |
865 | AMD64_RDI_REGNUM, /* %rdi */ | |
866 | AMD64_RSI_REGNUM, /* %rsi */ | |
867 | AMD64_RDX_REGNUM, /* %rdx */ | |
868 | AMD64_RCX_REGNUM, /* %rcx */ | |
5b856f36 PM |
869 | AMD64_R8_REGNUM, /* %r8 */ |
870 | AMD64_R9_REGNUM /* %r9 */ | |
bf4d6c1c | 871 | }; |
720aa428 MK |
872 | static int sse_regnum[] = |
873 | { | |
874 | /* %xmm0 ... %xmm7 */ | |
90f90721 MK |
875 | AMD64_XMM0_REGNUM + 0, AMD64_XMM1_REGNUM, |
876 | AMD64_XMM0_REGNUM + 2, AMD64_XMM0_REGNUM + 3, | |
877 | AMD64_XMM0_REGNUM + 4, AMD64_XMM0_REGNUM + 5, | |
878 | AMD64_XMM0_REGNUM + 6, AMD64_XMM0_REGNUM + 7, | |
720aa428 | 879 | }; |
224c3ddb | 880 | struct value **stack_args = XALLOCAVEC (struct value *, nargs); |
720aa428 MK |
881 | int num_stack_args = 0; |
882 | int num_elements = 0; | |
883 | int element = 0; | |
884 | int integer_reg = 0; | |
885 | int sse_reg = 0; | |
886 | int i; | |
887 | ||
6470d250 MK |
888 | /* Reserve a register for the "hidden" argument. */ |
889 | if (struct_return) | |
890 | integer_reg++; | |
891 | ||
720aa428 MK |
892 | for (i = 0; i < nargs; i++) |
893 | { | |
4991999e | 894 | struct type *type = value_type (args[i]); |
720aa428 | 895 | int len = TYPE_LENGTH (type); |
fe978cb0 | 896 | enum amd64_reg_class theclass[2]; |
720aa428 MK |
897 | int needed_integer_regs = 0; |
898 | int needed_sse_regs = 0; | |
899 | int j; | |
900 | ||
901 | /* Classify argument. */ | |
fe978cb0 | 902 | amd64_classify (type, theclass); |
720aa428 MK |
903 | |
904 | /* Calculate the number of integer and SSE registers needed for | |
905 | this argument. */ | |
906 | for (j = 0; j < 2; j++) | |
907 | { | |
fe978cb0 | 908 | if (theclass[j] == AMD64_INTEGER) |
720aa428 | 909 | needed_integer_regs++; |
fe978cb0 | 910 | else if (theclass[j] == AMD64_SSE) |
720aa428 MK |
911 | needed_sse_regs++; |
912 | } | |
913 | ||
914 | /* Check whether enough registers are available, and if the | |
915 | argument should be passed in registers at all. */ | |
bf4d6c1c | 916 | if (integer_reg + needed_integer_regs > ARRAY_SIZE (integer_regnum) |
720aa428 MK |
917 | || sse_reg + needed_sse_regs > ARRAY_SIZE (sse_regnum) |
918 | || (needed_integer_regs == 0 && needed_sse_regs == 0)) | |
919 | { | |
920 | /* The argument will be passed on the stack. */ | |
921 | num_elements += ((len + 7) / 8); | |
849e9755 | 922 | stack_args[num_stack_args++] = args[i]; |
720aa428 MK |
923 | } |
924 | else | |
925 | { | |
926 | /* The argument will be passed in registers. */ | |
d8de1ef7 MK |
927 | const gdb_byte *valbuf = value_contents (args[i]); |
928 | gdb_byte buf[8]; | |
720aa428 MK |
929 | |
930 | gdb_assert (len <= 16); | |
931 | ||
932 | for (j = 0; len > 0; j++, len -= 8) | |
933 | { | |
934 | int regnum = -1; | |
935 | int offset = 0; | |
936 | ||
fe978cb0 | 937 | switch (theclass[j]) |
720aa428 MK |
938 | { |
939 | case AMD64_INTEGER: | |
bf4d6c1c | 940 | regnum = integer_regnum[integer_reg++]; |
720aa428 MK |
941 | break; |
942 | ||
943 | case AMD64_SSE: | |
944 | regnum = sse_regnum[sse_reg++]; | |
945 | break; | |
946 | ||
947 | case AMD64_SSEUP: | |
948 | gdb_assert (sse_reg > 0); | |
949 | regnum = sse_regnum[sse_reg - 1]; | |
950 | offset = 8; | |
951 | break; | |
952 | ||
953 | default: | |
954 | gdb_assert (!"Unexpected register class."); | |
955 | } | |
956 | ||
957 | gdb_assert (regnum != -1); | |
958 | memset (buf, 0, sizeof buf); | |
959 | memcpy (buf, valbuf + j * 8, min (len, 8)); | |
960 | regcache_raw_write_part (regcache, regnum, offset, 8, buf); | |
961 | } | |
962 | } | |
963 | } | |
964 | ||
965 | /* Allocate space for the arguments on the stack. */ | |
966 | sp -= num_elements * 8; | |
967 | ||
968 | /* The psABI says that "The end of the input argument area shall be | |
969 | aligned on a 16 byte boundary." */ | |
970 | sp &= ~0xf; | |
971 | ||
972 | /* Write out the arguments to the stack. */ | |
973 | for (i = 0; i < num_stack_args; i++) | |
974 | { | |
4991999e | 975 | struct type *type = value_type (stack_args[i]); |
d8de1ef7 | 976 | const gdb_byte *valbuf = value_contents (stack_args[i]); |
849e9755 JB |
977 | int len = TYPE_LENGTH (type); |
978 | ||
979 | write_memory (sp + element * 8, valbuf, len); | |
980 | element += ((len + 7) / 8); | |
720aa428 MK |
981 | } |
982 | ||
983 | /* The psABI says that "For calls that may call functions that use | |
984 | varargs or stdargs (prototype-less calls or calls to functions | |
985 | containing ellipsis (...) in the declaration) %al is used as | |
986 | hidden argument to specify the number of SSE registers used. */ | |
90f90721 | 987 | regcache_raw_write_unsigned (regcache, AMD64_RAX_REGNUM, sse_reg); |
720aa428 MK |
988 | return sp; |
989 | } | |
990 | ||
c4f35dd8 | 991 | static CORE_ADDR |
7d9b040b | 992 | amd64_push_dummy_call (struct gdbarch *gdbarch, struct value *function, |
e53bef9f MK |
993 | struct regcache *regcache, CORE_ADDR bp_addr, |
994 | int nargs, struct value **args, CORE_ADDR sp, | |
995 | int struct_return, CORE_ADDR struct_addr) | |
53e95fcf | 996 | { |
e17a4113 | 997 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
d8de1ef7 | 998 | gdb_byte buf[8]; |
c4f35dd8 MK |
999 | |
1000 | /* Pass arguments. */ | |
6470d250 | 1001 | sp = amd64_push_arguments (regcache, nargs, args, sp, struct_return); |
c4f35dd8 MK |
1002 | |
1003 | /* Pass "hidden" argument". */ | |
1004 | if (struct_return) | |
1005 | { | |
e17a4113 | 1006 | store_unsigned_integer (buf, 8, byte_order, struct_addr); |
bf4d6c1c | 1007 | regcache_cooked_write (regcache, AMD64_RDI_REGNUM, buf); |
c4f35dd8 MK |
1008 | } |
1009 | ||
1010 | /* Store return address. */ | |
1011 | sp -= 8; | |
e17a4113 | 1012 | store_unsigned_integer (buf, 8, byte_order, bp_addr); |
c4f35dd8 MK |
1013 | write_memory (sp, buf, 8); |
1014 | ||
1015 | /* Finally, update the stack pointer... */ | |
e17a4113 | 1016 | store_unsigned_integer (buf, 8, byte_order, sp); |
90f90721 | 1017 | regcache_cooked_write (regcache, AMD64_RSP_REGNUM, buf); |
c4f35dd8 MK |
1018 | |
1019 | /* ...and fake a frame pointer. */ | |
90f90721 | 1020 | regcache_cooked_write (regcache, AMD64_RBP_REGNUM, buf); |
c4f35dd8 | 1021 | |
3e210248 | 1022 | return sp + 16; |
53e95fcf | 1023 | } |
c4f35dd8 | 1024 | \f |
35669430 DE |
1025 | /* Displaced instruction handling. */ |
1026 | ||
1027 | /* A partially decoded instruction. | |
1028 | This contains enough details for displaced stepping purposes. */ | |
1029 | ||
1030 | struct amd64_insn | |
1031 | { | |
1032 | /* The number of opcode bytes. */ | |
1033 | int opcode_len; | |
1034 | /* The offset of the rex prefix or -1 if not present. */ | |
1035 | int rex_offset; | |
1036 | /* The offset to the first opcode byte. */ | |
1037 | int opcode_offset; | |
1038 | /* The offset to the modrm byte or -1 if not present. */ | |
1039 | int modrm_offset; | |
1040 | ||
1041 | /* The raw instruction. */ | |
1042 | gdb_byte *raw_insn; | |
1043 | }; | |
1044 | ||
1045 | struct displaced_step_closure | |
1046 | { | |
1047 | /* For rip-relative insns, saved copy of the reg we use instead of %rip. */ | |
1048 | int tmp_used; | |
1049 | int tmp_regno; | |
1050 | ULONGEST tmp_save; | |
1051 | ||
1052 | /* Details of the instruction. */ | |
1053 | struct amd64_insn insn_details; | |
1054 | ||
1055 | /* Amount of space allocated to insn_buf. */ | |
1056 | int max_len; | |
1057 | ||
1058 | /* The possibly modified insn. | |
1059 | This is a variable-length field. */ | |
1060 | gdb_byte insn_buf[1]; | |
1061 | }; | |
1062 | ||
1063 | /* WARNING: Keep onebyte_has_modrm, twobyte_has_modrm in sync with | |
1064 | ../opcodes/i386-dis.c (until libopcodes exports them, or an alternative, | |
1065 | at which point delete these in favor of libopcodes' versions). */ | |
1066 | ||
1067 | static const unsigned char onebyte_has_modrm[256] = { | |
1068 | /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */ | |
1069 | /* ------------------------------- */ | |
1070 | /* 00 */ 1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0, /* 00 */ | |
1071 | /* 10 */ 1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0, /* 10 */ | |
1072 | /* 20 */ 1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0, /* 20 */ | |
1073 | /* 30 */ 1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0, /* 30 */ | |
1074 | /* 40 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 40 */ | |
1075 | /* 50 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 50 */ | |
1076 | /* 60 */ 0,0,1,1,0,0,0,0,0,1,0,1,0,0,0,0, /* 60 */ | |
1077 | /* 70 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 70 */ | |
1078 | /* 80 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* 80 */ | |
1079 | /* 90 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 90 */ | |
1080 | /* a0 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* a0 */ | |
1081 | /* b0 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* b0 */ | |
1082 | /* c0 */ 1,1,0,0,1,1,1,1,0,0,0,0,0,0,0,0, /* c0 */ | |
1083 | /* d0 */ 1,1,1,1,0,0,0,0,1,1,1,1,1,1,1,1, /* d0 */ | |
1084 | /* e0 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* e0 */ | |
1085 | /* f0 */ 0,0,0,0,0,0,1,1,0,0,0,0,0,0,1,1 /* f0 */ | |
1086 | /* ------------------------------- */ | |
1087 | /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */ | |
1088 | }; | |
1089 | ||
1090 | static const unsigned char twobyte_has_modrm[256] = { | |
1091 | /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */ | |
1092 | /* ------------------------------- */ | |
1093 | /* 00 */ 1,1,1,1,0,0,0,0,0,0,0,0,0,1,0,1, /* 0f */ | |
1094 | /* 10 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* 1f */ | |
1095 | /* 20 */ 1,1,1,1,1,1,1,0,1,1,1,1,1,1,1,1, /* 2f */ | |
1096 | /* 30 */ 0,0,0,0,0,0,0,0,1,0,1,0,0,0,0,0, /* 3f */ | |
1097 | /* 40 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* 4f */ | |
1098 | /* 50 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* 5f */ | |
1099 | /* 60 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* 6f */ | |
1100 | /* 70 */ 1,1,1,1,1,1,1,0,1,1,1,1,1,1,1,1, /* 7f */ | |
1101 | /* 80 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 8f */ | |
1102 | /* 90 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* 9f */ | |
1103 | /* a0 */ 0,0,0,1,1,1,1,1,0,0,0,1,1,1,1,1, /* af */ | |
1104 | /* b0 */ 1,1,1,1,1,1,1,1,1,0,1,1,1,1,1,1, /* bf */ | |
1105 | /* c0 */ 1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0, /* cf */ | |
1106 | /* d0 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* df */ | |
1107 | /* e0 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* ef */ | |
1108 | /* f0 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0 /* ff */ | |
1109 | /* ------------------------------- */ | |
1110 | /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */ | |
1111 | }; | |
1112 | ||
1113 | static int amd64_syscall_p (const struct amd64_insn *insn, int *lengthp); | |
1114 | ||
1115 | static int | |
1116 | rex_prefix_p (gdb_byte pfx) | |
1117 | { | |
1118 | return REX_PREFIX_P (pfx); | |
1119 | } | |
1120 | ||
1121 | /* Skip the legacy instruction prefixes in INSN. | |
1122 | We assume INSN is properly sentineled so we don't have to worry | |
1123 | about falling off the end of the buffer. */ | |
1124 | ||
1125 | static gdb_byte * | |
1903f0e6 | 1126 | amd64_skip_prefixes (gdb_byte *insn) |
35669430 DE |
1127 | { |
1128 | while (1) | |
1129 | { | |
1130 | switch (*insn) | |
1131 | { | |
1132 | case DATA_PREFIX_OPCODE: | |
1133 | case ADDR_PREFIX_OPCODE: | |
1134 | case CS_PREFIX_OPCODE: | |
1135 | case DS_PREFIX_OPCODE: | |
1136 | case ES_PREFIX_OPCODE: | |
1137 | case FS_PREFIX_OPCODE: | |
1138 | case GS_PREFIX_OPCODE: | |
1139 | case SS_PREFIX_OPCODE: | |
1140 | case LOCK_PREFIX_OPCODE: | |
1141 | case REPE_PREFIX_OPCODE: | |
1142 | case REPNE_PREFIX_OPCODE: | |
1143 | ++insn; | |
1144 | continue; | |
1145 | default: | |
1146 | break; | |
1147 | } | |
1148 | break; | |
1149 | } | |
1150 | ||
1151 | return insn; | |
1152 | } | |
1153 | ||
35669430 DE |
1154 | /* Return an integer register (other than RSP) that is unused as an input |
1155 | operand in INSN. | |
1156 | In order to not require adding a rex prefix if the insn doesn't already | |
1157 | have one, the result is restricted to RAX ... RDI, sans RSP. | |
1158 | The register numbering of the result follows architecture ordering, | |
1159 | e.g. RDI = 7. */ | |
1160 | ||
1161 | static int | |
1162 | amd64_get_unused_input_int_reg (const struct amd64_insn *details) | |
1163 | { | |
1164 | /* 1 bit for each reg */ | |
1165 | int used_regs_mask = 0; | |
1166 | ||
1167 | /* There can be at most 3 int regs used as inputs in an insn, and we have | |
1168 | 7 to choose from (RAX ... RDI, sans RSP). | |
1169 | This allows us to take a conservative approach and keep things simple. | |
1170 | E.g. By avoiding RAX, we don't have to specifically watch for opcodes | |
1171 | that implicitly specify RAX. */ | |
1172 | ||
1173 | /* Avoid RAX. */ | |
1174 | used_regs_mask |= 1 << EAX_REG_NUM; | |
1175 | /* Similarily avoid RDX, implicit operand in divides. */ | |
1176 | used_regs_mask |= 1 << EDX_REG_NUM; | |
1177 | /* Avoid RSP. */ | |
1178 | used_regs_mask |= 1 << ESP_REG_NUM; | |
1179 | ||
1180 | /* If the opcode is one byte long and there's no ModRM byte, | |
1181 | assume the opcode specifies a register. */ | |
1182 | if (details->opcode_len == 1 && details->modrm_offset == -1) | |
1183 | used_regs_mask |= 1 << (details->raw_insn[details->opcode_offset] & 7); | |
1184 | ||
1185 | /* Mark used regs in the modrm/sib bytes. */ | |
1186 | if (details->modrm_offset != -1) | |
1187 | { | |
1188 | int modrm = details->raw_insn[details->modrm_offset]; | |
1189 | int mod = MODRM_MOD_FIELD (modrm); | |
1190 | int reg = MODRM_REG_FIELD (modrm); | |
1191 | int rm = MODRM_RM_FIELD (modrm); | |
1192 | int have_sib = mod != 3 && rm == 4; | |
1193 | ||
1194 | /* Assume the reg field of the modrm byte specifies a register. */ | |
1195 | used_regs_mask |= 1 << reg; | |
1196 | ||
1197 | if (have_sib) | |
1198 | { | |
1199 | int base = SIB_BASE_FIELD (details->raw_insn[details->modrm_offset + 1]); | |
d48ebb5b | 1200 | int idx = SIB_INDEX_FIELD (details->raw_insn[details->modrm_offset + 1]); |
35669430 | 1201 | used_regs_mask |= 1 << base; |
d48ebb5b | 1202 | used_regs_mask |= 1 << idx; |
35669430 DE |
1203 | } |
1204 | else | |
1205 | { | |
1206 | used_regs_mask |= 1 << rm; | |
1207 | } | |
1208 | } | |
1209 | ||
1210 | gdb_assert (used_regs_mask < 256); | |
1211 | gdb_assert (used_regs_mask != 255); | |
1212 | ||
1213 | /* Finally, find a free reg. */ | |
1214 | { | |
1215 | int i; | |
1216 | ||
1217 | for (i = 0; i < 8; ++i) | |
1218 | { | |
1219 | if (! (used_regs_mask & (1 << i))) | |
1220 | return i; | |
1221 | } | |
1222 | ||
1223 | /* We shouldn't get here. */ | |
1224 | internal_error (__FILE__, __LINE__, _("unable to find free reg")); | |
1225 | } | |
1226 | } | |
1227 | ||
1228 | /* Extract the details of INSN that we need. */ | |
1229 | ||
1230 | static void | |
1231 | amd64_get_insn_details (gdb_byte *insn, struct amd64_insn *details) | |
1232 | { | |
1233 | gdb_byte *start = insn; | |
1234 | int need_modrm; | |
1235 | ||
1236 | details->raw_insn = insn; | |
1237 | ||
1238 | details->opcode_len = -1; | |
1239 | details->rex_offset = -1; | |
1240 | details->opcode_offset = -1; | |
1241 | details->modrm_offset = -1; | |
1242 | ||
1243 | /* Skip legacy instruction prefixes. */ | |
1903f0e6 | 1244 | insn = amd64_skip_prefixes (insn); |
35669430 DE |
1245 | |
1246 | /* Skip REX instruction prefix. */ | |
1247 | if (rex_prefix_p (*insn)) | |
1248 | { | |
1249 | details->rex_offset = insn - start; | |
1250 | ++insn; | |
1251 | } | |
1252 | ||
1253 | details->opcode_offset = insn - start; | |
1254 | ||
1255 | if (*insn == TWO_BYTE_OPCODE_ESCAPE) | |
1256 | { | |
1257 | /* Two or three-byte opcode. */ | |
1258 | ++insn; | |
1259 | need_modrm = twobyte_has_modrm[*insn]; | |
1260 | ||
1261 | /* Check for three-byte opcode. */ | |
1903f0e6 | 1262 | switch (*insn) |
35669430 | 1263 | { |
1903f0e6 DE |
1264 | case 0x24: |
1265 | case 0x25: | |
1266 | case 0x38: | |
1267 | case 0x3a: | |
1268 | case 0x7a: | |
1269 | case 0x7b: | |
35669430 DE |
1270 | ++insn; |
1271 | details->opcode_len = 3; | |
1903f0e6 DE |
1272 | break; |
1273 | default: | |
1274 | details->opcode_len = 2; | |
1275 | break; | |
35669430 | 1276 | } |
35669430 DE |
1277 | } |
1278 | else | |
1279 | { | |
1280 | /* One-byte opcode. */ | |
1281 | need_modrm = onebyte_has_modrm[*insn]; | |
1282 | details->opcode_len = 1; | |
1283 | } | |
1284 | ||
1285 | if (need_modrm) | |
1286 | { | |
1287 | ++insn; | |
1288 | details->modrm_offset = insn - start; | |
1289 | } | |
1290 | } | |
1291 | ||
1292 | /* Update %rip-relative addressing in INSN. | |
1293 | ||
1294 | %rip-relative addressing only uses a 32-bit displacement. | |
1295 | 32 bits is not enough to be guaranteed to cover the distance between where | |
1296 | the real instruction is and where its copy is. | |
1297 | Convert the insn to use base+disp addressing. | |
1298 | We set base = pc + insn_length so we can leave disp unchanged. */ | |
c4f35dd8 | 1299 | |
35669430 DE |
1300 | static void |
1301 | fixup_riprel (struct gdbarch *gdbarch, struct displaced_step_closure *dsc, | |
1302 | CORE_ADDR from, CORE_ADDR to, struct regcache *regs) | |
1303 | { | |
e17a4113 | 1304 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
35669430 DE |
1305 | const struct amd64_insn *insn_details = &dsc->insn_details; |
1306 | int modrm_offset = insn_details->modrm_offset; | |
1307 | gdb_byte *insn = insn_details->raw_insn + modrm_offset; | |
1308 | CORE_ADDR rip_base; | |
1309 | int32_t disp; | |
1310 | int insn_length; | |
1311 | int arch_tmp_regno, tmp_regno; | |
1312 | ULONGEST orig_value; | |
1313 | ||
1314 | /* %rip+disp32 addressing mode, displacement follows ModRM byte. */ | |
1315 | ++insn; | |
1316 | ||
1317 | /* Compute the rip-relative address. */ | |
e17a4113 | 1318 | disp = extract_signed_integer (insn, sizeof (int32_t), byte_order); |
eda5a4d7 PA |
1319 | insn_length = gdb_buffered_insn_length (gdbarch, dsc->insn_buf, |
1320 | dsc->max_len, from); | |
35669430 DE |
1321 | rip_base = from + insn_length; |
1322 | ||
1323 | /* We need a register to hold the address. | |
1324 | Pick one not used in the insn. | |
1325 | NOTE: arch_tmp_regno uses architecture ordering, e.g. RDI = 7. */ | |
1326 | arch_tmp_regno = amd64_get_unused_input_int_reg (insn_details); | |
1327 | tmp_regno = amd64_arch_reg_to_regnum (arch_tmp_regno); | |
1328 | ||
1329 | /* REX.B should be unset as we were using rip-relative addressing, | |
1330 | but ensure it's unset anyway, tmp_regno is not r8-r15. */ | |
1331 | if (insn_details->rex_offset != -1) | |
1332 | dsc->insn_buf[insn_details->rex_offset] &= ~REX_B; | |
1333 | ||
1334 | regcache_cooked_read_unsigned (regs, tmp_regno, &orig_value); | |
1335 | dsc->tmp_regno = tmp_regno; | |
1336 | dsc->tmp_save = orig_value; | |
1337 | dsc->tmp_used = 1; | |
1338 | ||
1339 | /* Convert the ModRM field to be base+disp. */ | |
1340 | dsc->insn_buf[modrm_offset] &= ~0xc7; | |
1341 | dsc->insn_buf[modrm_offset] |= 0x80 + arch_tmp_regno; | |
1342 | ||
1343 | regcache_cooked_write_unsigned (regs, tmp_regno, rip_base); | |
1344 | ||
1345 | if (debug_displaced) | |
1346 | fprintf_unfiltered (gdb_stdlog, "displaced: %%rip-relative addressing used.\n" | |
5af949e3 UW |
1347 | "displaced: using temp reg %d, old value %s, new value %s\n", |
1348 | dsc->tmp_regno, paddress (gdbarch, dsc->tmp_save), | |
1349 | paddress (gdbarch, rip_base)); | |
35669430 DE |
1350 | } |
1351 | ||
1352 | static void | |
1353 | fixup_displaced_copy (struct gdbarch *gdbarch, | |
1354 | struct displaced_step_closure *dsc, | |
1355 | CORE_ADDR from, CORE_ADDR to, struct regcache *regs) | |
1356 | { | |
1357 | const struct amd64_insn *details = &dsc->insn_details; | |
1358 | ||
1359 | if (details->modrm_offset != -1) | |
1360 | { | |
1361 | gdb_byte modrm = details->raw_insn[details->modrm_offset]; | |
1362 | ||
1363 | if ((modrm & 0xc7) == 0x05) | |
1364 | { | |
1365 | /* The insn uses rip-relative addressing. | |
1366 | Deal with it. */ | |
1367 | fixup_riprel (gdbarch, dsc, from, to, regs); | |
1368 | } | |
1369 | } | |
1370 | } | |
1371 | ||
1372 | struct displaced_step_closure * | |
1373 | amd64_displaced_step_copy_insn (struct gdbarch *gdbarch, | |
1374 | CORE_ADDR from, CORE_ADDR to, | |
1375 | struct regcache *regs) | |
1376 | { | |
1377 | int len = gdbarch_max_insn_length (gdbarch); | |
741e63d7 | 1378 | /* Extra space for sentinels so fixup_{riprel,displaced_copy} don't have to |
35669430 DE |
1379 | continually watch for running off the end of the buffer. */ |
1380 | int fixup_sentinel_space = len; | |
224c3ddb SM |
1381 | struct displaced_step_closure *dsc |
1382 | = ((struct displaced_step_closure *) | |
1383 | xmalloc (sizeof (*dsc) + len + fixup_sentinel_space)); | |
35669430 DE |
1384 | gdb_byte *buf = &dsc->insn_buf[0]; |
1385 | struct amd64_insn *details = &dsc->insn_details; | |
1386 | ||
1387 | dsc->tmp_used = 0; | |
1388 | dsc->max_len = len + fixup_sentinel_space; | |
1389 | ||
1390 | read_memory (from, buf, len); | |
1391 | ||
1392 | /* Set up the sentinel space so we don't have to worry about running | |
1393 | off the end of the buffer. An excessive number of leading prefixes | |
1394 | could otherwise cause this. */ | |
1395 | memset (buf + len, 0, fixup_sentinel_space); | |
1396 | ||
1397 | amd64_get_insn_details (buf, details); | |
1398 | ||
1399 | /* GDB may get control back after the insn after the syscall. | |
1400 | Presumably this is a kernel bug. | |
1401 | If this is a syscall, make sure there's a nop afterwards. */ | |
1402 | { | |
1403 | int syscall_length; | |
1404 | ||
1405 | if (amd64_syscall_p (details, &syscall_length)) | |
1406 | buf[details->opcode_offset + syscall_length] = NOP_OPCODE; | |
1407 | } | |
1408 | ||
1409 | /* Modify the insn to cope with the address where it will be executed from. | |
1410 | In particular, handle any rip-relative addressing. */ | |
1411 | fixup_displaced_copy (gdbarch, dsc, from, to, regs); | |
1412 | ||
1413 | write_memory (to, buf, len); | |
1414 | ||
1415 | if (debug_displaced) | |
1416 | { | |
5af949e3 UW |
1417 | fprintf_unfiltered (gdb_stdlog, "displaced: copy %s->%s: ", |
1418 | paddress (gdbarch, from), paddress (gdbarch, to)); | |
35669430 DE |
1419 | displaced_step_dump_bytes (gdb_stdlog, buf, len); |
1420 | } | |
1421 | ||
1422 | return dsc; | |
1423 | } | |
1424 | ||
1425 | static int | |
1426 | amd64_absolute_jmp_p (const struct amd64_insn *details) | |
1427 | { | |
1428 | const gdb_byte *insn = &details->raw_insn[details->opcode_offset]; | |
1429 | ||
1430 | if (insn[0] == 0xff) | |
1431 | { | |
1432 | /* jump near, absolute indirect (/4) */ | |
1433 | if ((insn[1] & 0x38) == 0x20) | |
1434 | return 1; | |
1435 | ||
1436 | /* jump far, absolute indirect (/5) */ | |
1437 | if ((insn[1] & 0x38) == 0x28) | |
1438 | return 1; | |
1439 | } | |
1440 | ||
1441 | return 0; | |
1442 | } | |
1443 | ||
c2170eef MM |
1444 | /* Return non-zero if the instruction DETAILS is a jump, zero otherwise. */ |
1445 | ||
1446 | static int | |
1447 | amd64_jmp_p (const struct amd64_insn *details) | |
1448 | { | |
1449 | const gdb_byte *insn = &details->raw_insn[details->opcode_offset]; | |
1450 | ||
1451 | /* jump short, relative. */ | |
1452 | if (insn[0] == 0xeb) | |
1453 | return 1; | |
1454 | ||
1455 | /* jump near, relative. */ | |
1456 | if (insn[0] == 0xe9) | |
1457 | return 1; | |
1458 | ||
1459 | return amd64_absolute_jmp_p (details); | |
1460 | } | |
1461 | ||
35669430 DE |
1462 | static int |
1463 | amd64_absolute_call_p (const struct amd64_insn *details) | |
1464 | { | |
1465 | const gdb_byte *insn = &details->raw_insn[details->opcode_offset]; | |
1466 | ||
1467 | if (insn[0] == 0xff) | |
1468 | { | |
1469 | /* Call near, absolute indirect (/2) */ | |
1470 | if ((insn[1] & 0x38) == 0x10) | |
1471 | return 1; | |
1472 | ||
1473 | /* Call far, absolute indirect (/3) */ | |
1474 | if ((insn[1] & 0x38) == 0x18) | |
1475 | return 1; | |
1476 | } | |
1477 | ||
1478 | return 0; | |
1479 | } | |
1480 | ||
1481 | static int | |
1482 | amd64_ret_p (const struct amd64_insn *details) | |
1483 | { | |
1484 | /* NOTE: gcc can emit "repz ; ret". */ | |
1485 | const gdb_byte *insn = &details->raw_insn[details->opcode_offset]; | |
1486 | ||
1487 | switch (insn[0]) | |
1488 | { | |
1489 | case 0xc2: /* ret near, pop N bytes */ | |
1490 | case 0xc3: /* ret near */ | |
1491 | case 0xca: /* ret far, pop N bytes */ | |
1492 | case 0xcb: /* ret far */ | |
1493 | case 0xcf: /* iret */ | |
1494 | return 1; | |
1495 | ||
1496 | default: | |
1497 | return 0; | |
1498 | } | |
1499 | } | |
1500 | ||
1501 | static int | |
1502 | amd64_call_p (const struct amd64_insn *details) | |
1503 | { | |
1504 | const gdb_byte *insn = &details->raw_insn[details->opcode_offset]; | |
1505 | ||
1506 | if (amd64_absolute_call_p (details)) | |
1507 | return 1; | |
1508 | ||
1509 | /* call near, relative */ | |
1510 | if (insn[0] == 0xe8) | |
1511 | return 1; | |
1512 | ||
1513 | return 0; | |
1514 | } | |
1515 | ||
35669430 DE |
1516 | /* Return non-zero if INSN is a system call, and set *LENGTHP to its |
1517 | length in bytes. Otherwise, return zero. */ | |
1518 | ||
1519 | static int | |
1520 | amd64_syscall_p (const struct amd64_insn *details, int *lengthp) | |
1521 | { | |
1522 | const gdb_byte *insn = &details->raw_insn[details->opcode_offset]; | |
1523 | ||
1524 | if (insn[0] == 0x0f && insn[1] == 0x05) | |
1525 | { | |
1526 | *lengthp = 2; | |
1527 | return 1; | |
1528 | } | |
1529 | ||
1530 | return 0; | |
1531 | } | |
1532 | ||
c2170eef MM |
1533 | /* Classify the instruction at ADDR using PRED. |
1534 | Throw an error if the memory can't be read. */ | |
1535 | ||
1536 | static int | |
1537 | amd64_classify_insn_at (struct gdbarch *gdbarch, CORE_ADDR addr, | |
1538 | int (*pred) (const struct amd64_insn *)) | |
1539 | { | |
1540 | struct amd64_insn details; | |
1541 | gdb_byte *buf; | |
1542 | int len, classification; | |
1543 | ||
1544 | len = gdbarch_max_insn_length (gdbarch); | |
224c3ddb | 1545 | buf = (gdb_byte *) alloca (len); |
c2170eef MM |
1546 | |
1547 | read_code (addr, buf, len); | |
1548 | amd64_get_insn_details (buf, &details); | |
1549 | ||
1550 | classification = pred (&details); | |
1551 | ||
1552 | return classification; | |
1553 | } | |
1554 | ||
1555 | /* The gdbarch insn_is_call method. */ | |
1556 | ||
1557 | static int | |
1558 | amd64_insn_is_call (struct gdbarch *gdbarch, CORE_ADDR addr) | |
1559 | { | |
1560 | return amd64_classify_insn_at (gdbarch, addr, amd64_call_p); | |
1561 | } | |
1562 | ||
1563 | /* The gdbarch insn_is_ret method. */ | |
1564 | ||
1565 | static int | |
1566 | amd64_insn_is_ret (struct gdbarch *gdbarch, CORE_ADDR addr) | |
1567 | { | |
1568 | return amd64_classify_insn_at (gdbarch, addr, amd64_ret_p); | |
1569 | } | |
1570 | ||
1571 | /* The gdbarch insn_is_jump method. */ | |
1572 | ||
1573 | static int | |
1574 | amd64_insn_is_jump (struct gdbarch *gdbarch, CORE_ADDR addr) | |
1575 | { | |
1576 | return amd64_classify_insn_at (gdbarch, addr, amd64_jmp_p); | |
1577 | } | |
1578 | ||
35669430 DE |
1579 | /* Fix up the state of registers and memory after having single-stepped |
1580 | a displaced instruction. */ | |
1581 | ||
1582 | void | |
1583 | amd64_displaced_step_fixup (struct gdbarch *gdbarch, | |
1584 | struct displaced_step_closure *dsc, | |
1585 | CORE_ADDR from, CORE_ADDR to, | |
1586 | struct regcache *regs) | |
1587 | { | |
e17a4113 | 1588 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
35669430 DE |
1589 | /* The offset we applied to the instruction's address. */ |
1590 | ULONGEST insn_offset = to - from; | |
1591 | gdb_byte *insn = dsc->insn_buf; | |
1592 | const struct amd64_insn *insn_details = &dsc->insn_details; | |
1593 | ||
1594 | if (debug_displaced) | |
1595 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 | 1596 | "displaced: fixup (%s, %s), " |
35669430 | 1597 | "insn = 0x%02x 0x%02x ...\n", |
5af949e3 UW |
1598 | paddress (gdbarch, from), paddress (gdbarch, to), |
1599 | insn[0], insn[1]); | |
35669430 DE |
1600 | |
1601 | /* If we used a tmp reg, restore it. */ | |
1602 | ||
1603 | if (dsc->tmp_used) | |
1604 | { | |
1605 | if (debug_displaced) | |
5af949e3 UW |
1606 | fprintf_unfiltered (gdb_stdlog, "displaced: restoring reg %d to %s\n", |
1607 | dsc->tmp_regno, paddress (gdbarch, dsc->tmp_save)); | |
35669430 DE |
1608 | regcache_cooked_write_unsigned (regs, dsc->tmp_regno, dsc->tmp_save); |
1609 | } | |
1610 | ||
1611 | /* The list of issues to contend with here is taken from | |
1612 | resume_execution in arch/x86/kernel/kprobes.c, Linux 2.6.28. | |
1613 | Yay for Free Software! */ | |
1614 | ||
1615 | /* Relocate the %rip back to the program's instruction stream, | |
1616 | if necessary. */ | |
1617 | ||
1618 | /* Except in the case of absolute or indirect jump or call | |
1619 | instructions, or a return instruction, the new rip is relative to | |
1620 | the displaced instruction; make it relative to the original insn. | |
1621 | Well, signal handler returns don't need relocation either, but we use the | |
1622 | value of %rip to recognize those; see below. */ | |
1623 | if (! amd64_absolute_jmp_p (insn_details) | |
1624 | && ! amd64_absolute_call_p (insn_details) | |
1625 | && ! amd64_ret_p (insn_details)) | |
1626 | { | |
1627 | ULONGEST orig_rip; | |
1628 | int insn_len; | |
1629 | ||
1630 | regcache_cooked_read_unsigned (regs, AMD64_RIP_REGNUM, &orig_rip); | |
1631 | ||
1632 | /* A signal trampoline system call changes the %rip, resuming | |
1633 | execution of the main program after the signal handler has | |
1634 | returned. That makes them like 'return' instructions; we | |
1635 | shouldn't relocate %rip. | |
1636 | ||
1637 | But most system calls don't, and we do need to relocate %rip. | |
1638 | ||
1639 | Our heuristic for distinguishing these cases: if stepping | |
1640 | over the system call instruction left control directly after | |
1641 | the instruction, the we relocate --- control almost certainly | |
1642 | doesn't belong in the displaced copy. Otherwise, we assume | |
1643 | the instruction has put control where it belongs, and leave | |
1644 | it unrelocated. Goodness help us if there are PC-relative | |
1645 | system calls. */ | |
1646 | if (amd64_syscall_p (insn_details, &insn_len) | |
1647 | && orig_rip != to + insn_len | |
1648 | /* GDB can get control back after the insn after the syscall. | |
1649 | Presumably this is a kernel bug. | |
1650 | Fixup ensures its a nop, we add one to the length for it. */ | |
1651 | && orig_rip != to + insn_len + 1) | |
1652 | { | |
1653 | if (debug_displaced) | |
1654 | fprintf_unfiltered (gdb_stdlog, | |
1655 | "displaced: syscall changed %%rip; " | |
1656 | "not relocating\n"); | |
1657 | } | |
1658 | else | |
1659 | { | |
1660 | ULONGEST rip = orig_rip - insn_offset; | |
1661 | ||
1903f0e6 DE |
1662 | /* If we just stepped over a breakpoint insn, we don't backup |
1663 | the pc on purpose; this is to match behaviour without | |
1664 | stepping. */ | |
35669430 DE |
1665 | |
1666 | regcache_cooked_write_unsigned (regs, AMD64_RIP_REGNUM, rip); | |
1667 | ||
1668 | if (debug_displaced) | |
1669 | fprintf_unfiltered (gdb_stdlog, | |
1670 | "displaced: " | |
5af949e3 UW |
1671 | "relocated %%rip from %s to %s\n", |
1672 | paddress (gdbarch, orig_rip), | |
1673 | paddress (gdbarch, rip)); | |
35669430 DE |
1674 | } |
1675 | } | |
1676 | ||
1677 | /* If the instruction was PUSHFL, then the TF bit will be set in the | |
1678 | pushed value, and should be cleared. We'll leave this for later, | |
1679 | since GDB already messes up the TF flag when stepping over a | |
1680 | pushfl. */ | |
1681 | ||
1682 | /* If the instruction was a call, the return address now atop the | |
1683 | stack is the address following the copied instruction. We need | |
1684 | to make it the address following the original instruction. */ | |
1685 | if (amd64_call_p (insn_details)) | |
1686 | { | |
1687 | ULONGEST rsp; | |
1688 | ULONGEST retaddr; | |
1689 | const ULONGEST retaddr_len = 8; | |
1690 | ||
1691 | regcache_cooked_read_unsigned (regs, AMD64_RSP_REGNUM, &rsp); | |
e17a4113 | 1692 | retaddr = read_memory_unsigned_integer (rsp, retaddr_len, byte_order); |
4dafcdeb | 1693 | retaddr = (retaddr - insn_offset) & 0xffffffffffffffffULL; |
e17a4113 | 1694 | write_memory_unsigned_integer (rsp, retaddr_len, byte_order, retaddr); |
35669430 DE |
1695 | |
1696 | if (debug_displaced) | |
1697 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
1698 | "displaced: relocated return addr at %s " |
1699 | "to %s\n", | |
1700 | paddress (gdbarch, rsp), | |
1701 | paddress (gdbarch, retaddr)); | |
35669430 DE |
1702 | } |
1703 | } | |
dde08ee1 PA |
1704 | |
1705 | /* If the instruction INSN uses RIP-relative addressing, return the | |
1706 | offset into the raw INSN where the displacement to be adjusted is | |
1707 | found. Returns 0 if the instruction doesn't use RIP-relative | |
1708 | addressing. */ | |
1709 | ||
1710 | static int | |
1711 | rip_relative_offset (struct amd64_insn *insn) | |
1712 | { | |
1713 | if (insn->modrm_offset != -1) | |
1714 | { | |
1715 | gdb_byte modrm = insn->raw_insn[insn->modrm_offset]; | |
1716 | ||
1717 | if ((modrm & 0xc7) == 0x05) | |
1718 | { | |
1719 | /* The displacement is found right after the ModRM byte. */ | |
1720 | return insn->modrm_offset + 1; | |
1721 | } | |
1722 | } | |
1723 | ||
1724 | return 0; | |
1725 | } | |
1726 | ||
1727 | static void | |
1728 | append_insns (CORE_ADDR *to, ULONGEST len, const gdb_byte *buf) | |
1729 | { | |
1730 | target_write_memory (*to, buf, len); | |
1731 | *to += len; | |
1732 | } | |
1733 | ||
60965737 | 1734 | static void |
dde08ee1 PA |
1735 | amd64_relocate_instruction (struct gdbarch *gdbarch, |
1736 | CORE_ADDR *to, CORE_ADDR oldloc) | |
1737 | { | |
1738 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
1739 | int len = gdbarch_max_insn_length (gdbarch); | |
1740 | /* Extra space for sentinels. */ | |
1741 | int fixup_sentinel_space = len; | |
224c3ddb | 1742 | gdb_byte *buf = (gdb_byte *) xmalloc (len + fixup_sentinel_space); |
dde08ee1 PA |
1743 | struct amd64_insn insn_details; |
1744 | int offset = 0; | |
1745 | LONGEST rel32, newrel; | |
1746 | gdb_byte *insn; | |
1747 | int insn_length; | |
1748 | ||
1749 | read_memory (oldloc, buf, len); | |
1750 | ||
1751 | /* Set up the sentinel space so we don't have to worry about running | |
1752 | off the end of the buffer. An excessive number of leading prefixes | |
1753 | could otherwise cause this. */ | |
1754 | memset (buf + len, 0, fixup_sentinel_space); | |
1755 | ||
1756 | insn = buf; | |
1757 | amd64_get_insn_details (insn, &insn_details); | |
1758 | ||
1759 | insn_length = gdb_buffered_insn_length (gdbarch, insn, len, oldloc); | |
1760 | ||
1761 | /* Skip legacy instruction prefixes. */ | |
1762 | insn = amd64_skip_prefixes (insn); | |
1763 | ||
1764 | /* Adjust calls with 32-bit relative addresses as push/jump, with | |
1765 | the address pushed being the location where the original call in | |
1766 | the user program would return to. */ | |
1767 | if (insn[0] == 0xe8) | |
1768 | { | |
1769 | gdb_byte push_buf[16]; | |
1770 | unsigned int ret_addr; | |
1771 | ||
1772 | /* Where "ret" in the original code will return to. */ | |
1773 | ret_addr = oldloc + insn_length; | |
0963b4bd | 1774 | push_buf[0] = 0x68; /* pushq $... */ |
144db827 | 1775 | store_unsigned_integer (&push_buf[1], 4, byte_order, ret_addr); |
dde08ee1 PA |
1776 | /* Push the push. */ |
1777 | append_insns (to, 5, push_buf); | |
1778 | ||
1779 | /* Convert the relative call to a relative jump. */ | |
1780 | insn[0] = 0xe9; | |
1781 | ||
1782 | /* Adjust the destination offset. */ | |
1783 | rel32 = extract_signed_integer (insn + 1, 4, byte_order); | |
1784 | newrel = (oldloc - *to) + rel32; | |
f4a1794a KY |
1785 | store_signed_integer (insn + 1, 4, byte_order, newrel); |
1786 | ||
1787 | if (debug_displaced) | |
1788 | fprintf_unfiltered (gdb_stdlog, | |
1789 | "Adjusted insn rel32=%s at %s to" | |
1790 | " rel32=%s at %s\n", | |
1791 | hex_string (rel32), paddress (gdbarch, oldloc), | |
1792 | hex_string (newrel), paddress (gdbarch, *to)); | |
dde08ee1 PA |
1793 | |
1794 | /* Write the adjusted jump into its displaced location. */ | |
1795 | append_insns (to, 5, insn); | |
1796 | return; | |
1797 | } | |
1798 | ||
1799 | offset = rip_relative_offset (&insn_details); | |
1800 | if (!offset) | |
1801 | { | |
1802 | /* Adjust jumps with 32-bit relative addresses. Calls are | |
1803 | already handled above. */ | |
1804 | if (insn[0] == 0xe9) | |
1805 | offset = 1; | |
1806 | /* Adjust conditional jumps. */ | |
1807 | else if (insn[0] == 0x0f && (insn[1] & 0xf0) == 0x80) | |
1808 | offset = 2; | |
1809 | } | |
1810 | ||
1811 | if (offset) | |
1812 | { | |
1813 | rel32 = extract_signed_integer (insn + offset, 4, byte_order); | |
1814 | newrel = (oldloc - *to) + rel32; | |
f4a1794a | 1815 | store_signed_integer (insn + offset, 4, byte_order, newrel); |
dde08ee1 PA |
1816 | if (debug_displaced) |
1817 | fprintf_unfiltered (gdb_stdlog, | |
f4a1794a KY |
1818 | "Adjusted insn rel32=%s at %s to" |
1819 | " rel32=%s at %s\n", | |
dde08ee1 PA |
1820 | hex_string (rel32), paddress (gdbarch, oldloc), |
1821 | hex_string (newrel), paddress (gdbarch, *to)); | |
1822 | } | |
1823 | ||
1824 | /* Write the adjusted instruction into its displaced location. */ | |
1825 | append_insns (to, insn_length, buf); | |
1826 | } | |
1827 | ||
35669430 | 1828 | \f |
c4f35dd8 | 1829 | /* The maximum number of saved registers. This should include %rip. */ |
90f90721 | 1830 | #define AMD64_NUM_SAVED_REGS AMD64_NUM_GREGS |
c4f35dd8 | 1831 | |
e53bef9f | 1832 | struct amd64_frame_cache |
c4f35dd8 MK |
1833 | { |
1834 | /* Base address. */ | |
1835 | CORE_ADDR base; | |
8fbca658 | 1836 | int base_p; |
c4f35dd8 MK |
1837 | CORE_ADDR sp_offset; |
1838 | CORE_ADDR pc; | |
1839 | ||
1840 | /* Saved registers. */ | |
e53bef9f | 1841 | CORE_ADDR saved_regs[AMD64_NUM_SAVED_REGS]; |
c4f35dd8 | 1842 | CORE_ADDR saved_sp; |
e0c62198 | 1843 | int saved_sp_reg; |
c4f35dd8 MK |
1844 | |
1845 | /* Do we have a frame? */ | |
1846 | int frameless_p; | |
1847 | }; | |
8dda9770 | 1848 | |
d2449ee8 | 1849 | /* Initialize a frame cache. */ |
c4f35dd8 | 1850 | |
d2449ee8 DJ |
1851 | static void |
1852 | amd64_init_frame_cache (struct amd64_frame_cache *cache) | |
8dda9770 | 1853 | { |
c4f35dd8 MK |
1854 | int i; |
1855 | ||
c4f35dd8 MK |
1856 | /* Base address. */ |
1857 | cache->base = 0; | |
8fbca658 | 1858 | cache->base_p = 0; |
c4f35dd8 MK |
1859 | cache->sp_offset = -8; |
1860 | cache->pc = 0; | |
1861 | ||
1862 | /* Saved registers. We initialize these to -1 since zero is a valid | |
bba66b87 DE |
1863 | offset (that's where %rbp is supposed to be stored). |
1864 | The values start out as being offsets, and are later converted to | |
1865 | addresses (at which point -1 is interpreted as an address, still meaning | |
1866 | "invalid"). */ | |
e53bef9f | 1867 | for (i = 0; i < AMD64_NUM_SAVED_REGS; i++) |
c4f35dd8 MK |
1868 | cache->saved_regs[i] = -1; |
1869 | cache->saved_sp = 0; | |
e0c62198 | 1870 | cache->saved_sp_reg = -1; |
c4f35dd8 MK |
1871 | |
1872 | /* Frameless until proven otherwise. */ | |
1873 | cache->frameless_p = 1; | |
d2449ee8 | 1874 | } |
c4f35dd8 | 1875 | |
d2449ee8 DJ |
1876 | /* Allocate and initialize a frame cache. */ |
1877 | ||
1878 | static struct amd64_frame_cache * | |
1879 | amd64_alloc_frame_cache (void) | |
1880 | { | |
1881 | struct amd64_frame_cache *cache; | |
1882 | ||
1883 | cache = FRAME_OBSTACK_ZALLOC (struct amd64_frame_cache); | |
1884 | amd64_init_frame_cache (cache); | |
c4f35dd8 | 1885 | return cache; |
8dda9770 | 1886 | } |
53e95fcf | 1887 | |
e0c62198 L |
1888 | /* GCC 4.4 and later, can put code in the prologue to realign the |
1889 | stack pointer. Check whether PC points to such code, and update | |
1890 | CACHE accordingly. Return the first instruction after the code | |
1891 | sequence or CURRENT_PC, whichever is smaller. If we don't | |
1892 | recognize the code, return PC. */ | |
1893 | ||
1894 | static CORE_ADDR | |
1895 | amd64_analyze_stack_align (CORE_ADDR pc, CORE_ADDR current_pc, | |
1896 | struct amd64_frame_cache *cache) | |
1897 | { | |
1898 | /* There are 2 code sequences to re-align stack before the frame | |
1899 | gets set up: | |
1900 | ||
1901 | 1. Use a caller-saved saved register: | |
1902 | ||
1903 | leaq 8(%rsp), %reg | |
1904 | andq $-XXX, %rsp | |
1905 | pushq -8(%reg) | |
1906 | ||
1907 | 2. Use a callee-saved saved register: | |
1908 | ||
1909 | pushq %reg | |
1910 | leaq 16(%rsp), %reg | |
1911 | andq $-XXX, %rsp | |
1912 | pushq -8(%reg) | |
1913 | ||
1914 | "andq $-XXX, %rsp" can be either 4 bytes or 7 bytes: | |
1915 | ||
1916 | 0x48 0x83 0xe4 0xf0 andq $-16, %rsp | |
1917 | 0x48 0x81 0xe4 0x00 0xff 0xff 0xff andq $-256, %rsp | |
1918 | */ | |
1919 | ||
1920 | gdb_byte buf[18]; | |
1921 | int reg, r; | |
1922 | int offset, offset_and; | |
e0c62198 | 1923 | |
bae8a07a | 1924 | if (target_read_code (pc, buf, sizeof buf)) |
e0c62198 L |
1925 | return pc; |
1926 | ||
1927 | /* Check caller-saved saved register. The first instruction has | |
1928 | to be "leaq 8(%rsp), %reg". */ | |
1929 | if ((buf[0] & 0xfb) == 0x48 | |
1930 | && buf[1] == 0x8d | |
1931 | && buf[3] == 0x24 | |
1932 | && buf[4] == 0x8) | |
1933 | { | |
1934 | /* MOD must be binary 10 and R/M must be binary 100. */ | |
1935 | if ((buf[2] & 0xc7) != 0x44) | |
1936 | return pc; | |
1937 | ||
1938 | /* REG has register number. */ | |
1939 | reg = (buf[2] >> 3) & 7; | |
1940 | ||
1941 | /* Check the REX.R bit. */ | |
1942 | if (buf[0] == 0x4c) | |
1943 | reg += 8; | |
1944 | ||
1945 | offset = 5; | |
1946 | } | |
1947 | else | |
1948 | { | |
1949 | /* Check callee-saved saved register. The first instruction | |
1950 | has to be "pushq %reg". */ | |
1951 | reg = 0; | |
1952 | if ((buf[0] & 0xf8) == 0x50) | |
1953 | offset = 0; | |
1954 | else if ((buf[0] & 0xf6) == 0x40 | |
1955 | && (buf[1] & 0xf8) == 0x50) | |
1956 | { | |
1957 | /* Check the REX.B bit. */ | |
1958 | if ((buf[0] & 1) != 0) | |
1959 | reg = 8; | |
1960 | ||
1961 | offset = 1; | |
1962 | } | |
1963 | else | |
1964 | return pc; | |
1965 | ||
1966 | /* Get register. */ | |
1967 | reg += buf[offset] & 0x7; | |
1968 | ||
1969 | offset++; | |
1970 | ||
1971 | /* The next instruction has to be "leaq 16(%rsp), %reg". */ | |
1972 | if ((buf[offset] & 0xfb) != 0x48 | |
1973 | || buf[offset + 1] != 0x8d | |
1974 | || buf[offset + 3] != 0x24 | |
1975 | || buf[offset + 4] != 0x10) | |
1976 | return pc; | |
1977 | ||
1978 | /* MOD must be binary 10 and R/M must be binary 100. */ | |
1979 | if ((buf[offset + 2] & 0xc7) != 0x44) | |
1980 | return pc; | |
1981 | ||
1982 | /* REG has register number. */ | |
1983 | r = (buf[offset + 2] >> 3) & 7; | |
1984 | ||
1985 | /* Check the REX.R bit. */ | |
1986 | if (buf[offset] == 0x4c) | |
1987 | r += 8; | |
1988 | ||
1989 | /* Registers in pushq and leaq have to be the same. */ | |
1990 | if (reg != r) | |
1991 | return pc; | |
1992 | ||
1993 | offset += 5; | |
1994 | } | |
1995 | ||
1996 | /* Rigister can't be %rsp nor %rbp. */ | |
1997 | if (reg == 4 || reg == 5) | |
1998 | return pc; | |
1999 | ||
2000 | /* The next instruction has to be "andq $-XXX, %rsp". */ | |
2001 | if (buf[offset] != 0x48 | |
2002 | || buf[offset + 2] != 0xe4 | |
2003 | || (buf[offset + 1] != 0x81 && buf[offset + 1] != 0x83)) | |
2004 | return pc; | |
2005 | ||
2006 | offset_and = offset; | |
2007 | offset += buf[offset + 1] == 0x81 ? 7 : 4; | |
2008 | ||
2009 | /* The next instruction has to be "pushq -8(%reg)". */ | |
2010 | r = 0; | |
2011 | if (buf[offset] == 0xff) | |
2012 | offset++; | |
2013 | else if ((buf[offset] & 0xf6) == 0x40 | |
2014 | && buf[offset + 1] == 0xff) | |
2015 | { | |
2016 | /* Check the REX.B bit. */ | |
2017 | if ((buf[offset] & 0x1) != 0) | |
2018 | r = 8; | |
2019 | offset += 2; | |
2020 | } | |
2021 | else | |
2022 | return pc; | |
2023 | ||
2024 | /* 8bit -8 is 0xf8. REG must be binary 110 and MOD must be binary | |
2025 | 01. */ | |
2026 | if (buf[offset + 1] != 0xf8 | |
2027 | || (buf[offset] & 0xf8) != 0x70) | |
2028 | return pc; | |
2029 | ||
2030 | /* R/M has register. */ | |
2031 | r += buf[offset] & 7; | |
2032 | ||
2033 | /* Registers in leaq and pushq have to be the same. */ | |
2034 | if (reg != r) | |
2035 | return pc; | |
2036 | ||
2037 | if (current_pc > pc + offset_and) | |
35669430 | 2038 | cache->saved_sp_reg = amd64_arch_reg_to_regnum (reg); |
e0c62198 L |
2039 | |
2040 | return min (pc + offset + 2, current_pc); | |
2041 | } | |
2042 | ||
ac142d96 L |
2043 | /* Similar to amd64_analyze_stack_align for x32. */ |
2044 | ||
2045 | static CORE_ADDR | |
2046 | amd64_x32_analyze_stack_align (CORE_ADDR pc, CORE_ADDR current_pc, | |
2047 | struct amd64_frame_cache *cache) | |
2048 | { | |
2049 | /* There are 2 code sequences to re-align stack before the frame | |
2050 | gets set up: | |
2051 | ||
2052 | 1. Use a caller-saved saved register: | |
2053 | ||
2054 | leaq 8(%rsp), %reg | |
2055 | andq $-XXX, %rsp | |
2056 | pushq -8(%reg) | |
2057 | ||
2058 | or | |
2059 | ||
2060 | [addr32] leal 8(%rsp), %reg | |
2061 | andl $-XXX, %esp | |
2062 | [addr32] pushq -8(%reg) | |
2063 | ||
2064 | 2. Use a callee-saved saved register: | |
2065 | ||
2066 | pushq %reg | |
2067 | leaq 16(%rsp), %reg | |
2068 | andq $-XXX, %rsp | |
2069 | pushq -8(%reg) | |
2070 | ||
2071 | or | |
2072 | ||
2073 | pushq %reg | |
2074 | [addr32] leal 16(%rsp), %reg | |
2075 | andl $-XXX, %esp | |
2076 | [addr32] pushq -8(%reg) | |
2077 | ||
2078 | "andq $-XXX, %rsp" can be either 4 bytes or 7 bytes: | |
2079 | ||
2080 | 0x48 0x83 0xe4 0xf0 andq $-16, %rsp | |
2081 | 0x48 0x81 0xe4 0x00 0xff 0xff 0xff andq $-256, %rsp | |
2082 | ||
2083 | "andl $-XXX, %esp" can be either 3 bytes or 6 bytes: | |
2084 | ||
2085 | 0x83 0xe4 0xf0 andl $-16, %esp | |
2086 | 0x81 0xe4 0x00 0xff 0xff 0xff andl $-256, %esp | |
2087 | */ | |
2088 | ||
2089 | gdb_byte buf[19]; | |
2090 | int reg, r; | |
2091 | int offset, offset_and; | |
2092 | ||
2093 | if (target_read_memory (pc, buf, sizeof buf)) | |
2094 | return pc; | |
2095 | ||
2096 | /* Skip optional addr32 prefix. */ | |
2097 | offset = buf[0] == 0x67 ? 1 : 0; | |
2098 | ||
2099 | /* Check caller-saved saved register. The first instruction has | |
2100 | to be "leaq 8(%rsp), %reg" or "leal 8(%rsp), %reg". */ | |
2101 | if (((buf[offset] & 0xfb) == 0x48 || (buf[offset] & 0xfb) == 0x40) | |
2102 | && buf[offset + 1] == 0x8d | |
2103 | && buf[offset + 3] == 0x24 | |
2104 | && buf[offset + 4] == 0x8) | |
2105 | { | |
2106 | /* MOD must be binary 10 and R/M must be binary 100. */ | |
2107 | if ((buf[offset + 2] & 0xc7) != 0x44) | |
2108 | return pc; | |
2109 | ||
2110 | /* REG has register number. */ | |
2111 | reg = (buf[offset + 2] >> 3) & 7; | |
2112 | ||
2113 | /* Check the REX.R bit. */ | |
2114 | if ((buf[offset] & 0x4) != 0) | |
2115 | reg += 8; | |
2116 | ||
2117 | offset += 5; | |
2118 | } | |
2119 | else | |
2120 | { | |
2121 | /* Check callee-saved saved register. The first instruction | |
2122 | has to be "pushq %reg". */ | |
2123 | reg = 0; | |
2124 | if ((buf[offset] & 0xf6) == 0x40 | |
2125 | && (buf[offset + 1] & 0xf8) == 0x50) | |
2126 | { | |
2127 | /* Check the REX.B bit. */ | |
2128 | if ((buf[offset] & 1) != 0) | |
2129 | reg = 8; | |
2130 | ||
2131 | offset += 1; | |
2132 | } | |
2133 | else if ((buf[offset] & 0xf8) != 0x50) | |
2134 | return pc; | |
2135 | ||
2136 | /* Get register. */ | |
2137 | reg += buf[offset] & 0x7; | |
2138 | ||
2139 | offset++; | |
2140 | ||
2141 | /* Skip optional addr32 prefix. */ | |
2142 | if (buf[offset] == 0x67) | |
2143 | offset++; | |
2144 | ||
2145 | /* The next instruction has to be "leaq 16(%rsp), %reg" or | |
2146 | "leal 16(%rsp), %reg". */ | |
2147 | if (((buf[offset] & 0xfb) != 0x48 && (buf[offset] & 0xfb) != 0x40) | |
2148 | || buf[offset + 1] != 0x8d | |
2149 | || buf[offset + 3] != 0x24 | |
2150 | || buf[offset + 4] != 0x10) | |
2151 | return pc; | |
2152 | ||
2153 | /* MOD must be binary 10 and R/M must be binary 100. */ | |
2154 | if ((buf[offset + 2] & 0xc7) != 0x44) | |
2155 | return pc; | |
2156 | ||
2157 | /* REG has register number. */ | |
2158 | r = (buf[offset + 2] >> 3) & 7; | |
2159 | ||
2160 | /* Check the REX.R bit. */ | |
2161 | if ((buf[offset] & 0x4) != 0) | |
2162 | r += 8; | |
2163 | ||
2164 | /* Registers in pushq and leaq have to be the same. */ | |
2165 | if (reg != r) | |
2166 | return pc; | |
2167 | ||
2168 | offset += 5; | |
2169 | } | |
2170 | ||
2171 | /* Rigister can't be %rsp nor %rbp. */ | |
2172 | if (reg == 4 || reg == 5) | |
2173 | return pc; | |
2174 | ||
2175 | /* The next instruction may be "andq $-XXX, %rsp" or | |
2176 | "andl $-XXX, %esp". */ | |
2177 | if (buf[offset] != 0x48) | |
2178 | offset--; | |
2179 | ||
2180 | if (buf[offset + 2] != 0xe4 | |
2181 | || (buf[offset + 1] != 0x81 && buf[offset + 1] != 0x83)) | |
2182 | return pc; | |
2183 | ||
2184 | offset_and = offset; | |
2185 | offset += buf[offset + 1] == 0x81 ? 7 : 4; | |
2186 | ||
2187 | /* Skip optional addr32 prefix. */ | |
2188 | if (buf[offset] == 0x67) | |
2189 | offset++; | |
2190 | ||
2191 | /* The next instruction has to be "pushq -8(%reg)". */ | |
2192 | r = 0; | |
2193 | if (buf[offset] == 0xff) | |
2194 | offset++; | |
2195 | else if ((buf[offset] & 0xf6) == 0x40 | |
2196 | && buf[offset + 1] == 0xff) | |
2197 | { | |
2198 | /* Check the REX.B bit. */ | |
2199 | if ((buf[offset] & 0x1) != 0) | |
2200 | r = 8; | |
2201 | offset += 2; | |
2202 | } | |
2203 | else | |
2204 | return pc; | |
2205 | ||
2206 | /* 8bit -8 is 0xf8. REG must be binary 110 and MOD must be binary | |
2207 | 01. */ | |
2208 | if (buf[offset + 1] != 0xf8 | |
2209 | || (buf[offset] & 0xf8) != 0x70) | |
2210 | return pc; | |
2211 | ||
2212 | /* R/M has register. */ | |
2213 | r += buf[offset] & 7; | |
2214 | ||
2215 | /* Registers in leaq and pushq have to be the same. */ | |
2216 | if (reg != r) | |
2217 | return pc; | |
2218 | ||
2219 | if (current_pc > pc + offset_and) | |
2220 | cache->saved_sp_reg = amd64_arch_reg_to_regnum (reg); | |
2221 | ||
2222 | return min (pc + offset + 2, current_pc); | |
2223 | } | |
2224 | ||
c4f35dd8 MK |
2225 | /* Do a limited analysis of the prologue at PC and update CACHE |
2226 | accordingly. Bail out early if CURRENT_PC is reached. Return the | |
2227 | address where the analysis stopped. | |
2228 | ||
2229 | We will handle only functions beginning with: | |
2230 | ||
2231 | pushq %rbp 0x55 | |
50f1ae7b | 2232 | movq %rsp, %rbp 0x48 0x89 0xe5 (or 0x48 0x8b 0xec) |
c4f35dd8 | 2233 | |
649e6d92 MK |
2234 | or (for the X32 ABI): |
2235 | ||
2236 | pushq %rbp 0x55 | |
2237 | movl %esp, %ebp 0x89 0xe5 (or 0x8b 0xec) | |
2238 | ||
2239 | Any function that doesn't start with one of these sequences will be | |
2240 | assumed to have no prologue and thus no valid frame pointer in | |
2241 | %rbp. */ | |
c4f35dd8 MK |
2242 | |
2243 | static CORE_ADDR | |
e17a4113 UW |
2244 | amd64_analyze_prologue (struct gdbarch *gdbarch, |
2245 | CORE_ADDR pc, CORE_ADDR current_pc, | |
e53bef9f | 2246 | struct amd64_frame_cache *cache) |
53e95fcf | 2247 | { |
e17a4113 | 2248 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
50f1ae7b DE |
2249 | /* There are two variations of movq %rsp, %rbp. */ |
2250 | static const gdb_byte mov_rsp_rbp_1[3] = { 0x48, 0x89, 0xe5 }; | |
2251 | static const gdb_byte mov_rsp_rbp_2[3] = { 0x48, 0x8b, 0xec }; | |
649e6d92 MK |
2252 | /* Ditto for movl %esp, %ebp. */ |
2253 | static const gdb_byte mov_esp_ebp_1[2] = { 0x89, 0xe5 }; | |
2254 | static const gdb_byte mov_esp_ebp_2[2] = { 0x8b, 0xec }; | |
2255 | ||
d8de1ef7 MK |
2256 | gdb_byte buf[3]; |
2257 | gdb_byte op; | |
c4f35dd8 MK |
2258 | |
2259 | if (current_pc <= pc) | |
2260 | return current_pc; | |
2261 | ||
ac142d96 L |
2262 | if (gdbarch_ptr_bit (gdbarch) == 32) |
2263 | pc = amd64_x32_analyze_stack_align (pc, current_pc, cache); | |
2264 | else | |
2265 | pc = amd64_analyze_stack_align (pc, current_pc, cache); | |
e0c62198 | 2266 | |
bae8a07a | 2267 | op = read_code_unsigned_integer (pc, 1, byte_order); |
c4f35dd8 MK |
2268 | |
2269 | if (op == 0x55) /* pushq %rbp */ | |
2270 | { | |
2271 | /* Take into account that we've executed the `pushq %rbp' that | |
2272 | starts this instruction sequence. */ | |
90f90721 | 2273 | cache->saved_regs[AMD64_RBP_REGNUM] = 0; |
c4f35dd8 MK |
2274 | cache->sp_offset += 8; |
2275 | ||
2276 | /* If that's all, return now. */ | |
2277 | if (current_pc <= pc + 1) | |
2278 | return current_pc; | |
2279 | ||
bae8a07a | 2280 | read_code (pc + 1, buf, 3); |
c4f35dd8 | 2281 | |
649e6d92 MK |
2282 | /* Check for `movq %rsp, %rbp'. */ |
2283 | if (memcmp (buf, mov_rsp_rbp_1, 3) == 0 | |
2284 | || memcmp (buf, mov_rsp_rbp_2, 3) == 0) | |
2285 | { | |
2286 | /* OK, we actually have a frame. */ | |
2287 | cache->frameless_p = 0; | |
2288 | return pc + 4; | |
2289 | } | |
2290 | ||
2291 | /* For X32, also check for `movq %esp, %ebp'. */ | |
2292 | if (gdbarch_ptr_bit (gdbarch) == 32) | |
2293 | { | |
2294 | if (memcmp (buf, mov_esp_ebp_1, 2) == 0 | |
2295 | || memcmp (buf, mov_esp_ebp_2, 2) == 0) | |
2296 | { | |
2297 | /* OK, we actually have a frame. */ | |
2298 | cache->frameless_p = 0; | |
2299 | return pc + 3; | |
2300 | } | |
2301 | } | |
2302 | ||
2303 | return pc + 1; | |
c4f35dd8 MK |
2304 | } |
2305 | ||
2306 | return pc; | |
53e95fcf JS |
2307 | } |
2308 | ||
df15bd07 JK |
2309 | /* Work around false termination of prologue - GCC PR debug/48827. |
2310 | ||
2311 | START_PC is the first instruction of a function, PC is its minimal already | |
2312 | determined advanced address. Function returns PC if it has nothing to do. | |
2313 | ||
2314 | 84 c0 test %al,%al | |
2315 | 74 23 je after | |
2316 | <-- here is 0 lines advance - the false prologue end marker. | |
2317 | 0f 29 85 70 ff ff ff movaps %xmm0,-0x90(%rbp) | |
2318 | 0f 29 4d 80 movaps %xmm1,-0x80(%rbp) | |
2319 | 0f 29 55 90 movaps %xmm2,-0x70(%rbp) | |
2320 | 0f 29 5d a0 movaps %xmm3,-0x60(%rbp) | |
2321 | 0f 29 65 b0 movaps %xmm4,-0x50(%rbp) | |
2322 | 0f 29 6d c0 movaps %xmm5,-0x40(%rbp) | |
2323 | 0f 29 75 d0 movaps %xmm6,-0x30(%rbp) | |
2324 | 0f 29 7d e0 movaps %xmm7,-0x20(%rbp) | |
2325 | after: */ | |
c4f35dd8 MK |
2326 | |
2327 | static CORE_ADDR | |
df15bd07 | 2328 | amd64_skip_xmm_prologue (CORE_ADDR pc, CORE_ADDR start_pc) |
53e95fcf | 2329 | { |
08711b9a JK |
2330 | struct symtab_and_line start_pc_sal, next_sal; |
2331 | gdb_byte buf[4 + 8 * 7]; | |
2332 | int offset, xmmreg; | |
c4f35dd8 | 2333 | |
08711b9a JK |
2334 | if (pc == start_pc) |
2335 | return pc; | |
2336 | ||
2337 | start_pc_sal = find_pc_sect_line (start_pc, NULL, 0); | |
2338 | if (start_pc_sal.symtab == NULL | |
43f3e411 DE |
2339 | || producer_is_gcc_ge_4 (COMPUNIT_PRODUCER |
2340 | (SYMTAB_COMPUNIT (start_pc_sal.symtab))) < 6 | |
08711b9a JK |
2341 | || start_pc_sal.pc != start_pc || pc >= start_pc_sal.end) |
2342 | return pc; | |
2343 | ||
2344 | next_sal = find_pc_sect_line (start_pc_sal.end, NULL, 0); | |
2345 | if (next_sal.line != start_pc_sal.line) | |
2346 | return pc; | |
2347 | ||
2348 | /* START_PC can be from overlayed memory, ignored here. */ | |
bae8a07a | 2349 | if (target_read_code (next_sal.pc - 4, buf, sizeof (buf)) != 0) |
08711b9a JK |
2350 | return pc; |
2351 | ||
2352 | /* test %al,%al */ | |
2353 | if (buf[0] != 0x84 || buf[1] != 0xc0) | |
2354 | return pc; | |
2355 | /* je AFTER */ | |
2356 | if (buf[2] != 0x74) | |
2357 | return pc; | |
2358 | ||
2359 | offset = 4; | |
2360 | for (xmmreg = 0; xmmreg < 8; xmmreg++) | |
2361 | { | |
bede5f5f | 2362 | /* 0x0f 0x29 0b??000101 movaps %xmmreg?,-0x??(%rbp) */ |
08711b9a | 2363 | if (buf[offset] != 0x0f || buf[offset + 1] != 0x29 |
bede5f5f | 2364 | || (buf[offset + 2] & 0x3f) != (xmmreg << 3 | 0x5)) |
08711b9a JK |
2365 | return pc; |
2366 | ||
bede5f5f JK |
2367 | /* 0b01?????? */ |
2368 | if ((buf[offset + 2] & 0xc0) == 0x40) | |
08711b9a JK |
2369 | { |
2370 | /* 8-bit displacement. */ | |
2371 | offset += 4; | |
2372 | } | |
bede5f5f JK |
2373 | /* 0b10?????? */ |
2374 | else if ((buf[offset + 2] & 0xc0) == 0x80) | |
08711b9a JK |
2375 | { |
2376 | /* 32-bit displacement. */ | |
2377 | offset += 7; | |
2378 | } | |
2379 | else | |
2380 | return pc; | |
2381 | } | |
2382 | ||
2383 | /* je AFTER */ | |
2384 | if (offset - 4 != buf[3]) | |
2385 | return pc; | |
2386 | ||
2387 | return next_sal.end; | |
53e95fcf | 2388 | } |
df15bd07 JK |
2389 | |
2390 | /* Return PC of first real instruction. */ | |
2391 | ||
2392 | static CORE_ADDR | |
2393 | amd64_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR start_pc) | |
2394 | { | |
2395 | struct amd64_frame_cache cache; | |
2396 | CORE_ADDR pc; | |
56bf0743 KB |
2397 | CORE_ADDR func_addr; |
2398 | ||
2399 | if (find_pc_partial_function (start_pc, NULL, &func_addr, NULL)) | |
2400 | { | |
2401 | CORE_ADDR post_prologue_pc | |
2402 | = skip_prologue_using_sal (gdbarch, func_addr); | |
43f3e411 | 2403 | struct compunit_symtab *cust = find_pc_compunit_symtab (func_addr); |
56bf0743 KB |
2404 | |
2405 | /* Clang always emits a line note before the prologue and another | |
2406 | one after. We trust clang to emit usable line notes. */ | |
2407 | if (post_prologue_pc | |
43f3e411 DE |
2408 | && (cust != NULL |
2409 | && COMPUNIT_PRODUCER (cust) != NULL | |
61012eef | 2410 | && startswith (COMPUNIT_PRODUCER (cust), "clang "))) |
56bf0743 KB |
2411 | return max (start_pc, post_prologue_pc); |
2412 | } | |
df15bd07 JK |
2413 | |
2414 | amd64_init_frame_cache (&cache); | |
2415 | pc = amd64_analyze_prologue (gdbarch, start_pc, 0xffffffffffffffffLL, | |
2416 | &cache); | |
2417 | if (cache.frameless_p) | |
2418 | return start_pc; | |
2419 | ||
2420 | return amd64_skip_xmm_prologue (pc, start_pc); | |
2421 | } | |
c4f35dd8 | 2422 | \f |
53e95fcf | 2423 | |
c4f35dd8 MK |
2424 | /* Normal frames. */ |
2425 | ||
8fbca658 PA |
2426 | static void |
2427 | amd64_frame_cache_1 (struct frame_info *this_frame, | |
2428 | struct amd64_frame_cache *cache) | |
6d686a84 | 2429 | { |
e17a4113 UW |
2430 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
2431 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
d8de1ef7 | 2432 | gdb_byte buf[8]; |
6d686a84 | 2433 | int i; |
6d686a84 | 2434 | |
10458914 | 2435 | cache->pc = get_frame_func (this_frame); |
c4f35dd8 | 2436 | if (cache->pc != 0) |
e17a4113 UW |
2437 | amd64_analyze_prologue (gdbarch, cache->pc, get_frame_pc (this_frame), |
2438 | cache); | |
c4f35dd8 MK |
2439 | |
2440 | if (cache->frameless_p) | |
2441 | { | |
4a28816e MK |
2442 | /* We didn't find a valid frame. If we're at the start of a |
2443 | function, or somewhere half-way its prologue, the function's | |
2444 | frame probably hasn't been fully setup yet. Try to | |
2445 | reconstruct the base address for the stack frame by looking | |
2446 | at the stack pointer. For truly "frameless" functions this | |
2447 | might work too. */ | |
c4f35dd8 | 2448 | |
e0c62198 L |
2449 | if (cache->saved_sp_reg != -1) |
2450 | { | |
8fbca658 PA |
2451 | /* Stack pointer has been saved. */ |
2452 | get_frame_register (this_frame, cache->saved_sp_reg, buf); | |
2453 | cache->saved_sp = extract_unsigned_integer (buf, 8, byte_order); | |
2454 | ||
e0c62198 L |
2455 | /* We're halfway aligning the stack. */ |
2456 | cache->base = ((cache->saved_sp - 8) & 0xfffffffffffffff0LL) - 8; | |
2457 | cache->saved_regs[AMD64_RIP_REGNUM] = cache->saved_sp - 8; | |
2458 | ||
2459 | /* This will be added back below. */ | |
2460 | cache->saved_regs[AMD64_RIP_REGNUM] -= cache->base; | |
2461 | } | |
2462 | else | |
2463 | { | |
2464 | get_frame_register (this_frame, AMD64_RSP_REGNUM, buf); | |
e17a4113 UW |
2465 | cache->base = extract_unsigned_integer (buf, 8, byte_order) |
2466 | + cache->sp_offset; | |
e0c62198 | 2467 | } |
c4f35dd8 | 2468 | } |
35883a3f MK |
2469 | else |
2470 | { | |
10458914 | 2471 | get_frame_register (this_frame, AMD64_RBP_REGNUM, buf); |
e17a4113 | 2472 | cache->base = extract_unsigned_integer (buf, 8, byte_order); |
35883a3f | 2473 | } |
c4f35dd8 MK |
2474 | |
2475 | /* Now that we have the base address for the stack frame we can | |
2476 | calculate the value of %rsp in the calling frame. */ | |
2477 | cache->saved_sp = cache->base + 16; | |
2478 | ||
35883a3f MK |
2479 | /* For normal frames, %rip is stored at 8(%rbp). If we don't have a |
2480 | frame we find it at the same offset from the reconstructed base | |
e0c62198 L |
2481 | address. If we're halfway aligning the stack, %rip is handled |
2482 | differently (see above). */ | |
2483 | if (!cache->frameless_p || cache->saved_sp_reg == -1) | |
2484 | cache->saved_regs[AMD64_RIP_REGNUM] = 8; | |
35883a3f | 2485 | |
c4f35dd8 MK |
2486 | /* Adjust all the saved registers such that they contain addresses |
2487 | instead of offsets. */ | |
e53bef9f | 2488 | for (i = 0; i < AMD64_NUM_SAVED_REGS; i++) |
c4f35dd8 MK |
2489 | if (cache->saved_regs[i] != -1) |
2490 | cache->saved_regs[i] += cache->base; | |
2491 | ||
8fbca658 PA |
2492 | cache->base_p = 1; |
2493 | } | |
2494 | ||
2495 | static struct amd64_frame_cache * | |
2496 | amd64_frame_cache (struct frame_info *this_frame, void **this_cache) | |
2497 | { | |
8fbca658 PA |
2498 | struct amd64_frame_cache *cache; |
2499 | ||
2500 | if (*this_cache) | |
9a3c8263 | 2501 | return (struct amd64_frame_cache *) *this_cache; |
8fbca658 PA |
2502 | |
2503 | cache = amd64_alloc_frame_cache (); | |
2504 | *this_cache = cache; | |
2505 | ||
492d29ea | 2506 | TRY |
8fbca658 PA |
2507 | { |
2508 | amd64_frame_cache_1 (this_frame, cache); | |
2509 | } | |
492d29ea | 2510 | CATCH (ex, RETURN_MASK_ERROR) |
7556d4a4 PA |
2511 | { |
2512 | if (ex.error != NOT_AVAILABLE_ERROR) | |
2513 | throw_exception (ex); | |
2514 | } | |
492d29ea | 2515 | END_CATCH |
8fbca658 | 2516 | |
c4f35dd8 | 2517 | return cache; |
6d686a84 ML |
2518 | } |
2519 | ||
8fbca658 PA |
2520 | static enum unwind_stop_reason |
2521 | amd64_frame_unwind_stop_reason (struct frame_info *this_frame, | |
2522 | void **this_cache) | |
2523 | { | |
2524 | struct amd64_frame_cache *cache = | |
2525 | amd64_frame_cache (this_frame, this_cache); | |
2526 | ||
2527 | if (!cache->base_p) | |
2528 | return UNWIND_UNAVAILABLE; | |
2529 | ||
2530 | /* This marks the outermost frame. */ | |
2531 | if (cache->base == 0) | |
2532 | return UNWIND_OUTERMOST; | |
2533 | ||
2534 | return UNWIND_NO_REASON; | |
2535 | } | |
2536 | ||
c4f35dd8 | 2537 | static void |
10458914 | 2538 | amd64_frame_this_id (struct frame_info *this_frame, void **this_cache, |
e53bef9f | 2539 | struct frame_id *this_id) |
c4f35dd8 | 2540 | { |
e53bef9f | 2541 | struct amd64_frame_cache *cache = |
10458914 | 2542 | amd64_frame_cache (this_frame, this_cache); |
c4f35dd8 | 2543 | |
8fbca658 | 2544 | if (!cache->base_p) |
5ce0145d PA |
2545 | (*this_id) = frame_id_build_unavailable_stack (cache->pc); |
2546 | else if (cache->base == 0) | |
2547 | { | |
2548 | /* This marks the outermost frame. */ | |
2549 | return; | |
2550 | } | |
2551 | else | |
2552 | (*this_id) = frame_id_build (cache->base + 16, cache->pc); | |
c4f35dd8 | 2553 | } |
e76e1718 | 2554 | |
10458914 DJ |
2555 | static struct value * |
2556 | amd64_frame_prev_register (struct frame_info *this_frame, void **this_cache, | |
2557 | int regnum) | |
53e95fcf | 2558 | { |
10458914 | 2559 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
e53bef9f | 2560 | struct amd64_frame_cache *cache = |
10458914 | 2561 | amd64_frame_cache (this_frame, this_cache); |
e76e1718 | 2562 | |
c4f35dd8 | 2563 | gdb_assert (regnum >= 0); |
b1ab997b | 2564 | |
2ae02b47 | 2565 | if (regnum == gdbarch_sp_regnum (gdbarch) && cache->saved_sp) |
10458914 | 2566 | return frame_unwind_got_constant (this_frame, regnum, cache->saved_sp); |
e76e1718 | 2567 | |
e53bef9f | 2568 | if (regnum < AMD64_NUM_SAVED_REGS && cache->saved_regs[regnum] != -1) |
10458914 DJ |
2569 | return frame_unwind_got_memory (this_frame, regnum, |
2570 | cache->saved_regs[regnum]); | |
e76e1718 | 2571 | |
10458914 | 2572 | return frame_unwind_got_register (this_frame, regnum, regnum); |
c4f35dd8 | 2573 | } |
e76e1718 | 2574 | |
e53bef9f | 2575 | static const struct frame_unwind amd64_frame_unwind = |
c4f35dd8 MK |
2576 | { |
2577 | NORMAL_FRAME, | |
8fbca658 | 2578 | amd64_frame_unwind_stop_reason, |
e53bef9f | 2579 | amd64_frame_this_id, |
10458914 DJ |
2580 | amd64_frame_prev_register, |
2581 | NULL, | |
2582 | default_frame_sniffer | |
c4f35dd8 | 2583 | }; |
c4f35dd8 | 2584 | \f |
6710bf39 SS |
2585 | /* Generate a bytecode expression to get the value of the saved PC. */ |
2586 | ||
2587 | static void | |
2588 | amd64_gen_return_address (struct gdbarch *gdbarch, | |
2589 | struct agent_expr *ax, struct axs_value *value, | |
2590 | CORE_ADDR scope) | |
2591 | { | |
2592 | /* The following sequence assumes the traditional use of the base | |
2593 | register. */ | |
2594 | ax_reg (ax, AMD64_RBP_REGNUM); | |
2595 | ax_const_l (ax, 8); | |
2596 | ax_simple (ax, aop_add); | |
2597 | value->type = register_type (gdbarch, AMD64_RIP_REGNUM); | |
2598 | value->kind = axs_lvalue_memory; | |
2599 | } | |
2600 | \f | |
e76e1718 | 2601 | |
c4f35dd8 MK |
2602 | /* Signal trampolines. */ |
2603 | ||
2604 | /* FIXME: kettenis/20030419: Perhaps, we can unify the 32-bit and | |
2605 | 64-bit variants. This would require using identical frame caches | |
2606 | on both platforms. */ | |
2607 | ||
e53bef9f | 2608 | static struct amd64_frame_cache * |
10458914 | 2609 | amd64_sigtramp_frame_cache (struct frame_info *this_frame, void **this_cache) |
c4f35dd8 | 2610 | { |
e17a4113 UW |
2611 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
2612 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
2613 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
e53bef9f | 2614 | struct amd64_frame_cache *cache; |
c4f35dd8 | 2615 | CORE_ADDR addr; |
d8de1ef7 | 2616 | gdb_byte buf[8]; |
2b5e0749 | 2617 | int i; |
c4f35dd8 MK |
2618 | |
2619 | if (*this_cache) | |
9a3c8263 | 2620 | return (struct amd64_frame_cache *) *this_cache; |
c4f35dd8 | 2621 | |
e53bef9f | 2622 | cache = amd64_alloc_frame_cache (); |
c4f35dd8 | 2623 | |
492d29ea | 2624 | TRY |
8fbca658 PA |
2625 | { |
2626 | get_frame_register (this_frame, AMD64_RSP_REGNUM, buf); | |
2627 | cache->base = extract_unsigned_integer (buf, 8, byte_order) - 8; | |
2628 | ||
2629 | addr = tdep->sigcontext_addr (this_frame); | |
2630 | gdb_assert (tdep->sc_reg_offset); | |
2631 | gdb_assert (tdep->sc_num_regs <= AMD64_NUM_SAVED_REGS); | |
2632 | for (i = 0; i < tdep->sc_num_regs; i++) | |
2633 | if (tdep->sc_reg_offset[i] != -1) | |
2634 | cache->saved_regs[i] = addr + tdep->sc_reg_offset[i]; | |
c4f35dd8 | 2635 | |
8fbca658 PA |
2636 | cache->base_p = 1; |
2637 | } | |
492d29ea | 2638 | CATCH (ex, RETURN_MASK_ERROR) |
7556d4a4 PA |
2639 | { |
2640 | if (ex.error != NOT_AVAILABLE_ERROR) | |
2641 | throw_exception (ex); | |
2642 | } | |
492d29ea | 2643 | END_CATCH |
c4f35dd8 MK |
2644 | |
2645 | *this_cache = cache; | |
2646 | return cache; | |
53e95fcf JS |
2647 | } |
2648 | ||
8fbca658 PA |
2649 | static enum unwind_stop_reason |
2650 | amd64_sigtramp_frame_unwind_stop_reason (struct frame_info *this_frame, | |
2651 | void **this_cache) | |
2652 | { | |
2653 | struct amd64_frame_cache *cache = | |
2654 | amd64_sigtramp_frame_cache (this_frame, this_cache); | |
2655 | ||
2656 | if (!cache->base_p) | |
2657 | return UNWIND_UNAVAILABLE; | |
2658 | ||
2659 | return UNWIND_NO_REASON; | |
2660 | } | |
2661 | ||
c4f35dd8 | 2662 | static void |
10458914 | 2663 | amd64_sigtramp_frame_this_id (struct frame_info *this_frame, |
e53bef9f | 2664 | void **this_cache, struct frame_id *this_id) |
c4f35dd8 | 2665 | { |
e53bef9f | 2666 | struct amd64_frame_cache *cache = |
10458914 | 2667 | amd64_sigtramp_frame_cache (this_frame, this_cache); |
c4f35dd8 | 2668 | |
8fbca658 | 2669 | if (!cache->base_p) |
5ce0145d PA |
2670 | (*this_id) = frame_id_build_unavailable_stack (get_frame_pc (this_frame)); |
2671 | else if (cache->base == 0) | |
2672 | { | |
2673 | /* This marks the outermost frame. */ | |
2674 | return; | |
2675 | } | |
2676 | else | |
2677 | (*this_id) = frame_id_build (cache->base + 16, get_frame_pc (this_frame)); | |
c4f35dd8 MK |
2678 | } |
2679 | ||
10458914 DJ |
2680 | static struct value * |
2681 | amd64_sigtramp_frame_prev_register (struct frame_info *this_frame, | |
2682 | void **this_cache, int regnum) | |
c4f35dd8 MK |
2683 | { |
2684 | /* Make sure we've initialized the cache. */ | |
10458914 | 2685 | amd64_sigtramp_frame_cache (this_frame, this_cache); |
c4f35dd8 | 2686 | |
10458914 | 2687 | return amd64_frame_prev_register (this_frame, this_cache, regnum); |
c4f35dd8 MK |
2688 | } |
2689 | ||
10458914 DJ |
2690 | static int |
2691 | amd64_sigtramp_frame_sniffer (const struct frame_unwind *self, | |
2692 | struct frame_info *this_frame, | |
2693 | void **this_cache) | |
c4f35dd8 | 2694 | { |
10458914 | 2695 | struct gdbarch_tdep *tdep = gdbarch_tdep (get_frame_arch (this_frame)); |
911bc6ee MK |
2696 | |
2697 | /* We shouldn't even bother if we don't have a sigcontext_addr | |
2698 | handler. */ | |
2699 | if (tdep->sigcontext_addr == NULL) | |
10458914 | 2700 | return 0; |
911bc6ee MK |
2701 | |
2702 | if (tdep->sigtramp_p != NULL) | |
2703 | { | |
10458914 DJ |
2704 | if (tdep->sigtramp_p (this_frame)) |
2705 | return 1; | |
911bc6ee | 2706 | } |
c4f35dd8 | 2707 | |
911bc6ee | 2708 | if (tdep->sigtramp_start != 0) |
1c3545ae | 2709 | { |
10458914 | 2710 | CORE_ADDR pc = get_frame_pc (this_frame); |
1c3545ae | 2711 | |
911bc6ee MK |
2712 | gdb_assert (tdep->sigtramp_end != 0); |
2713 | if (pc >= tdep->sigtramp_start && pc < tdep->sigtramp_end) | |
10458914 | 2714 | return 1; |
1c3545ae | 2715 | } |
c4f35dd8 | 2716 | |
10458914 | 2717 | return 0; |
c4f35dd8 | 2718 | } |
10458914 DJ |
2719 | |
2720 | static const struct frame_unwind amd64_sigtramp_frame_unwind = | |
2721 | { | |
2722 | SIGTRAMP_FRAME, | |
8fbca658 | 2723 | amd64_sigtramp_frame_unwind_stop_reason, |
10458914 DJ |
2724 | amd64_sigtramp_frame_this_id, |
2725 | amd64_sigtramp_frame_prev_register, | |
2726 | NULL, | |
2727 | amd64_sigtramp_frame_sniffer | |
2728 | }; | |
c4f35dd8 MK |
2729 | \f |
2730 | ||
2731 | static CORE_ADDR | |
10458914 | 2732 | amd64_frame_base_address (struct frame_info *this_frame, void **this_cache) |
c4f35dd8 | 2733 | { |
e53bef9f | 2734 | struct amd64_frame_cache *cache = |
10458914 | 2735 | amd64_frame_cache (this_frame, this_cache); |
c4f35dd8 MK |
2736 | |
2737 | return cache->base; | |
2738 | } | |
2739 | ||
e53bef9f | 2740 | static const struct frame_base amd64_frame_base = |
c4f35dd8 | 2741 | { |
e53bef9f MK |
2742 | &amd64_frame_unwind, |
2743 | amd64_frame_base_address, | |
2744 | amd64_frame_base_address, | |
2745 | amd64_frame_base_address | |
c4f35dd8 MK |
2746 | }; |
2747 | ||
872761f4 MS |
2748 | /* Normal frames, but in a function epilogue. */ |
2749 | ||
c9cf6e20 MG |
2750 | /* Implement the stack_frame_destroyed_p gdbarch method. |
2751 | ||
2752 | The epilogue is defined here as the 'ret' instruction, which will | |
872761f4 MS |
2753 | follow any instruction such as 'leave' or 'pop %ebp' that destroys |
2754 | the function's stack frame. */ | |
2755 | ||
2756 | static int | |
c9cf6e20 | 2757 | amd64_stack_frame_destroyed_p (struct gdbarch *gdbarch, CORE_ADDR pc) |
872761f4 MS |
2758 | { |
2759 | gdb_byte insn; | |
43f3e411 | 2760 | struct compunit_symtab *cust; |
e0d00bc7 | 2761 | |
43f3e411 DE |
2762 | cust = find_pc_compunit_symtab (pc); |
2763 | if (cust != NULL && COMPUNIT_EPILOGUE_UNWIND_VALID (cust)) | |
e0d00bc7 | 2764 | return 0; |
872761f4 MS |
2765 | |
2766 | if (target_read_memory (pc, &insn, 1)) | |
2767 | return 0; /* Can't read memory at pc. */ | |
2768 | ||
2769 | if (insn != 0xc3) /* 'ret' instruction. */ | |
2770 | return 0; | |
2771 | ||
2772 | return 1; | |
2773 | } | |
2774 | ||
2775 | static int | |
2776 | amd64_epilogue_frame_sniffer (const struct frame_unwind *self, | |
2777 | struct frame_info *this_frame, | |
2778 | void **this_prologue_cache) | |
2779 | { | |
2780 | if (frame_relative_level (this_frame) == 0) | |
c9cf6e20 MG |
2781 | return amd64_stack_frame_destroyed_p (get_frame_arch (this_frame), |
2782 | get_frame_pc (this_frame)); | |
872761f4 MS |
2783 | else |
2784 | return 0; | |
2785 | } | |
2786 | ||
2787 | static struct amd64_frame_cache * | |
2788 | amd64_epilogue_frame_cache (struct frame_info *this_frame, void **this_cache) | |
2789 | { | |
2790 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
2791 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
2792 | struct amd64_frame_cache *cache; | |
6c10c06b | 2793 | gdb_byte buf[8]; |
872761f4 MS |
2794 | |
2795 | if (*this_cache) | |
9a3c8263 | 2796 | return (struct amd64_frame_cache *) *this_cache; |
872761f4 MS |
2797 | |
2798 | cache = amd64_alloc_frame_cache (); | |
2799 | *this_cache = cache; | |
2800 | ||
492d29ea | 2801 | TRY |
8fbca658 PA |
2802 | { |
2803 | /* Cache base will be %esp plus cache->sp_offset (-8). */ | |
2804 | get_frame_register (this_frame, AMD64_RSP_REGNUM, buf); | |
2805 | cache->base = extract_unsigned_integer (buf, 8, | |
2806 | byte_order) + cache->sp_offset; | |
2807 | ||
2808 | /* Cache pc will be the frame func. */ | |
2809 | cache->pc = get_frame_pc (this_frame); | |
872761f4 | 2810 | |
8fbca658 PA |
2811 | /* The saved %esp will be at cache->base plus 16. */ |
2812 | cache->saved_sp = cache->base + 16; | |
872761f4 | 2813 | |
8fbca658 PA |
2814 | /* The saved %eip will be at cache->base plus 8. */ |
2815 | cache->saved_regs[AMD64_RIP_REGNUM] = cache->base + 8; | |
872761f4 | 2816 | |
8fbca658 PA |
2817 | cache->base_p = 1; |
2818 | } | |
492d29ea | 2819 | CATCH (ex, RETURN_MASK_ERROR) |
7556d4a4 PA |
2820 | { |
2821 | if (ex.error != NOT_AVAILABLE_ERROR) | |
2822 | throw_exception (ex); | |
2823 | } | |
492d29ea | 2824 | END_CATCH |
872761f4 MS |
2825 | |
2826 | return cache; | |
2827 | } | |
2828 | ||
8fbca658 PA |
2829 | static enum unwind_stop_reason |
2830 | amd64_epilogue_frame_unwind_stop_reason (struct frame_info *this_frame, | |
2831 | void **this_cache) | |
2832 | { | |
2833 | struct amd64_frame_cache *cache | |
2834 | = amd64_epilogue_frame_cache (this_frame, this_cache); | |
2835 | ||
2836 | if (!cache->base_p) | |
2837 | return UNWIND_UNAVAILABLE; | |
2838 | ||
2839 | return UNWIND_NO_REASON; | |
2840 | } | |
2841 | ||
872761f4 MS |
2842 | static void |
2843 | amd64_epilogue_frame_this_id (struct frame_info *this_frame, | |
2844 | void **this_cache, | |
2845 | struct frame_id *this_id) | |
2846 | { | |
2847 | struct amd64_frame_cache *cache = amd64_epilogue_frame_cache (this_frame, | |
2848 | this_cache); | |
2849 | ||
8fbca658 | 2850 | if (!cache->base_p) |
5ce0145d PA |
2851 | (*this_id) = frame_id_build_unavailable_stack (cache->pc); |
2852 | else | |
2853 | (*this_id) = frame_id_build (cache->base + 8, cache->pc); | |
872761f4 MS |
2854 | } |
2855 | ||
2856 | static const struct frame_unwind amd64_epilogue_frame_unwind = | |
2857 | { | |
2858 | NORMAL_FRAME, | |
8fbca658 | 2859 | amd64_epilogue_frame_unwind_stop_reason, |
872761f4 MS |
2860 | amd64_epilogue_frame_this_id, |
2861 | amd64_frame_prev_register, | |
2862 | NULL, | |
2863 | amd64_epilogue_frame_sniffer | |
2864 | }; | |
2865 | ||
166f4c7b | 2866 | static struct frame_id |
10458914 | 2867 | amd64_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame) |
166f4c7b | 2868 | { |
c4f35dd8 MK |
2869 | CORE_ADDR fp; |
2870 | ||
10458914 | 2871 | fp = get_frame_register_unsigned (this_frame, AMD64_RBP_REGNUM); |
c4f35dd8 | 2872 | |
10458914 | 2873 | return frame_id_build (fp + 16, get_frame_pc (this_frame)); |
166f4c7b ML |
2874 | } |
2875 | ||
8b148df9 AC |
2876 | /* 16 byte align the SP per frame requirements. */ |
2877 | ||
2878 | static CORE_ADDR | |
e53bef9f | 2879 | amd64_frame_align (struct gdbarch *gdbarch, CORE_ADDR sp) |
8b148df9 AC |
2880 | { |
2881 | return sp & -(CORE_ADDR)16; | |
2882 | } | |
473f17b0 MK |
2883 | \f |
2884 | ||
593adc23 MK |
2885 | /* Supply register REGNUM from the buffer specified by FPREGS and LEN |
2886 | in the floating-point register set REGSET to register cache | |
2887 | REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */ | |
473f17b0 MK |
2888 | |
2889 | static void | |
e53bef9f MK |
2890 | amd64_supply_fpregset (const struct regset *regset, struct regcache *regcache, |
2891 | int regnum, const void *fpregs, size_t len) | |
473f17b0 | 2892 | { |
09424cff AA |
2893 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
2894 | const struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
473f17b0 | 2895 | |
1528345d | 2896 | gdb_assert (len >= tdep->sizeof_fpregset); |
90f90721 | 2897 | amd64_supply_fxsave (regcache, regnum, fpregs); |
473f17b0 | 2898 | } |
8b148df9 | 2899 | |
593adc23 MK |
2900 | /* Collect register REGNUM from the register cache REGCACHE and store |
2901 | it in the buffer specified by FPREGS and LEN as described by the | |
2902 | floating-point register set REGSET. If REGNUM is -1, do this for | |
2903 | all registers in REGSET. */ | |
2904 | ||
2905 | static void | |
2906 | amd64_collect_fpregset (const struct regset *regset, | |
2907 | const struct regcache *regcache, | |
2908 | int regnum, void *fpregs, size_t len) | |
2909 | { | |
09424cff AA |
2910 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
2911 | const struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
593adc23 | 2912 | |
1528345d | 2913 | gdb_assert (len >= tdep->sizeof_fpregset); |
593adc23 MK |
2914 | amd64_collect_fxsave (regcache, regnum, fpregs); |
2915 | } | |
2916 | ||
8f0435f7 | 2917 | const struct regset amd64_fpregset = |
ecc37a5a AA |
2918 | { |
2919 | NULL, amd64_supply_fpregset, amd64_collect_fpregset | |
2920 | }; | |
c6b33596 MK |
2921 | \f |
2922 | ||
436675d3 PA |
2923 | /* Figure out where the longjmp will land. Slurp the jmp_buf out of |
2924 | %rdi. We expect its value to be a pointer to the jmp_buf structure | |
2925 | from which we extract the address that we will land at. This | |
2926 | address is copied into PC. This routine returns non-zero on | |
2927 | success. */ | |
2928 | ||
2929 | static int | |
2930 | amd64_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc) | |
2931 | { | |
2932 | gdb_byte buf[8]; | |
2933 | CORE_ADDR jb_addr; | |
2934 | struct gdbarch *gdbarch = get_frame_arch (frame); | |
2935 | int jb_pc_offset = gdbarch_tdep (gdbarch)->jb_pc_offset; | |
0dfff4cb | 2936 | int len = TYPE_LENGTH (builtin_type (gdbarch)->builtin_func_ptr); |
436675d3 PA |
2937 | |
2938 | /* If JB_PC_OFFSET is -1, we have no way to find out where the | |
2939 | longjmp will land. */ | |
2940 | if (jb_pc_offset == -1) | |
2941 | return 0; | |
2942 | ||
2943 | get_frame_register (frame, AMD64_RDI_REGNUM, buf); | |
0dfff4cb UW |
2944 | jb_addr= extract_typed_address |
2945 | (buf, builtin_type (gdbarch)->builtin_data_ptr); | |
436675d3 PA |
2946 | if (target_read_memory (jb_addr + jb_pc_offset, buf, len)) |
2947 | return 0; | |
2948 | ||
0dfff4cb | 2949 | *pc = extract_typed_address (buf, builtin_type (gdbarch)->builtin_func_ptr); |
436675d3 PA |
2950 | |
2951 | return 1; | |
2952 | } | |
2953 | ||
cf648174 HZ |
2954 | static const int amd64_record_regmap[] = |
2955 | { | |
2956 | AMD64_RAX_REGNUM, AMD64_RCX_REGNUM, AMD64_RDX_REGNUM, AMD64_RBX_REGNUM, | |
2957 | AMD64_RSP_REGNUM, AMD64_RBP_REGNUM, AMD64_RSI_REGNUM, AMD64_RDI_REGNUM, | |
2958 | AMD64_R8_REGNUM, AMD64_R9_REGNUM, AMD64_R10_REGNUM, AMD64_R11_REGNUM, | |
2959 | AMD64_R12_REGNUM, AMD64_R13_REGNUM, AMD64_R14_REGNUM, AMD64_R15_REGNUM, | |
2960 | AMD64_RIP_REGNUM, AMD64_EFLAGS_REGNUM, AMD64_CS_REGNUM, AMD64_SS_REGNUM, | |
2961 | AMD64_DS_REGNUM, AMD64_ES_REGNUM, AMD64_FS_REGNUM, AMD64_GS_REGNUM | |
2962 | }; | |
2963 | ||
2213a65d | 2964 | void |
90f90721 | 2965 | amd64_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
53e95fcf | 2966 | { |
0c1a73d6 | 2967 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
90884b2b | 2968 | const struct target_desc *tdesc = info.target_desc; |
05c0465e SDJ |
2969 | static const char *const stap_integer_prefixes[] = { "$", NULL }; |
2970 | static const char *const stap_register_prefixes[] = { "%", NULL }; | |
2971 | static const char *const stap_register_indirection_prefixes[] = { "(", | |
2972 | NULL }; | |
2973 | static const char *const stap_register_indirection_suffixes[] = { ")", | |
2974 | NULL }; | |
53e95fcf | 2975 | |
473f17b0 MK |
2976 | /* AMD64 generally uses `fxsave' instead of `fsave' for saving its |
2977 | floating-point registers. */ | |
2978 | tdep->sizeof_fpregset = I387_SIZEOF_FXSAVE; | |
8f0435f7 | 2979 | tdep->fpregset = &amd64_fpregset; |
473f17b0 | 2980 | |
90884b2b L |
2981 | if (! tdesc_has_registers (tdesc)) |
2982 | tdesc = tdesc_amd64; | |
2983 | tdep->tdesc = tdesc; | |
2984 | ||
2985 | tdep->num_core_regs = AMD64_NUM_GREGS + I387_NUM_REGS; | |
2986 | tdep->register_names = amd64_register_names; | |
2987 | ||
01f9f808 MS |
2988 | if (tdesc_find_feature (tdesc, "org.gnu.gdb.i386.avx512") != NULL) |
2989 | { | |
2990 | tdep->zmmh_register_names = amd64_zmmh_names; | |
2991 | tdep->k_register_names = amd64_k_names; | |
2992 | tdep->xmm_avx512_register_names = amd64_xmm_avx512_names; | |
2993 | tdep->ymm16h_register_names = amd64_ymmh_avx512_names; | |
2994 | ||
2995 | tdep->num_zmm_regs = 32; | |
2996 | tdep->num_xmm_avx512_regs = 16; | |
2997 | tdep->num_ymm_avx512_regs = 16; | |
2998 | ||
2999 | tdep->zmm0h_regnum = AMD64_ZMM0H_REGNUM; | |
3000 | tdep->k0_regnum = AMD64_K0_REGNUM; | |
3001 | tdep->xmm16_regnum = AMD64_XMM16_REGNUM; | |
3002 | tdep->ymm16h_regnum = AMD64_YMM16H_REGNUM; | |
3003 | } | |
3004 | ||
a055a187 L |
3005 | if (tdesc_find_feature (tdesc, "org.gnu.gdb.i386.avx") != NULL) |
3006 | { | |
3007 | tdep->ymmh_register_names = amd64_ymmh_names; | |
3008 | tdep->num_ymm_regs = 16; | |
3009 | tdep->ymm0h_regnum = AMD64_YMM0H_REGNUM; | |
3010 | } | |
3011 | ||
e43e105e WT |
3012 | if (tdesc_find_feature (tdesc, "org.gnu.gdb.i386.mpx") != NULL) |
3013 | { | |
3014 | tdep->mpx_register_names = amd64_mpx_names; | |
3015 | tdep->bndcfgu_regnum = AMD64_BNDCFGU_REGNUM; | |
3016 | tdep->bnd0r_regnum = AMD64_BND0R_REGNUM; | |
3017 | } | |
3018 | ||
fe01d668 | 3019 | tdep->num_byte_regs = 20; |
1ba53b71 L |
3020 | tdep->num_word_regs = 16; |
3021 | tdep->num_dword_regs = 16; | |
3022 | /* Avoid wiring in the MMX registers for now. */ | |
3023 | tdep->num_mmx_regs = 0; | |
3024 | ||
3543a589 TT |
3025 | set_gdbarch_pseudo_register_read_value (gdbarch, |
3026 | amd64_pseudo_register_read_value); | |
1ba53b71 L |
3027 | set_gdbarch_pseudo_register_write (gdbarch, |
3028 | amd64_pseudo_register_write); | |
62e5fd57 MK |
3029 | set_gdbarch_ax_pseudo_register_collect (gdbarch, |
3030 | amd64_ax_pseudo_register_collect); | |
1ba53b71 L |
3031 | |
3032 | set_tdesc_pseudo_register_name (gdbarch, amd64_pseudo_register_name); | |
3033 | ||
5716833c | 3034 | /* AMD64 has an FPU and 16 SSE registers. */ |
90f90721 | 3035 | tdep->st0_regnum = AMD64_ST0_REGNUM; |
0c1a73d6 | 3036 | tdep->num_xmm_regs = 16; |
53e95fcf | 3037 | |
0c1a73d6 | 3038 | /* This is what all the fuss is about. */ |
53e95fcf JS |
3039 | set_gdbarch_long_bit (gdbarch, 64); |
3040 | set_gdbarch_long_long_bit (gdbarch, 64); | |
3041 | set_gdbarch_ptr_bit (gdbarch, 64); | |
3042 | ||
e53bef9f MK |
3043 | /* In contrast to the i386, on AMD64 a `long double' actually takes |
3044 | up 128 bits, even though it's still based on the i387 extended | |
3045 | floating-point format which has only 80 significant bits. */ | |
b83b026c MK |
3046 | set_gdbarch_long_double_bit (gdbarch, 128); |
3047 | ||
e53bef9f | 3048 | set_gdbarch_num_regs (gdbarch, AMD64_NUM_REGS); |
b83b026c MK |
3049 | |
3050 | /* Register numbers of various important registers. */ | |
90f90721 MK |
3051 | set_gdbarch_sp_regnum (gdbarch, AMD64_RSP_REGNUM); /* %rsp */ |
3052 | set_gdbarch_pc_regnum (gdbarch, AMD64_RIP_REGNUM); /* %rip */ | |
3053 | set_gdbarch_ps_regnum (gdbarch, AMD64_EFLAGS_REGNUM); /* %eflags */ | |
3054 | set_gdbarch_fp0_regnum (gdbarch, AMD64_ST0_REGNUM); /* %st(0) */ | |
b83b026c | 3055 | |
e53bef9f MK |
3056 | /* The "default" register numbering scheme for AMD64 is referred to |
3057 | as the "DWARF Register Number Mapping" in the System V psABI. | |
3058 | The preferred debugging format for all known AMD64 targets is | |
3059 | actually DWARF2, and GCC doesn't seem to support DWARF (that is | |
3060 | DWARF-1), but we provide the same mapping just in case. This | |
3061 | mapping is also used for stabs, which GCC does support. */ | |
3062 | set_gdbarch_stab_reg_to_regnum (gdbarch, amd64_dwarf_reg_to_regnum); | |
e53bef9f | 3063 | set_gdbarch_dwarf2_reg_to_regnum (gdbarch, amd64_dwarf_reg_to_regnum); |
de220d0f | 3064 | |
c4f35dd8 | 3065 | /* We don't override SDB_REG_RO_REGNUM, since COFF doesn't seem to |
e53bef9f | 3066 | be in use on any of the supported AMD64 targets. */ |
53e95fcf | 3067 | |
c4f35dd8 | 3068 | /* Call dummy code. */ |
e53bef9f MK |
3069 | set_gdbarch_push_dummy_call (gdbarch, amd64_push_dummy_call); |
3070 | set_gdbarch_frame_align (gdbarch, amd64_frame_align); | |
8b148df9 | 3071 | set_gdbarch_frame_red_zone_size (gdbarch, 128); |
53e95fcf | 3072 | |
83acabca | 3073 | set_gdbarch_convert_register_p (gdbarch, i387_convert_register_p); |
d532c08f MK |
3074 | set_gdbarch_register_to_value (gdbarch, i387_register_to_value); |
3075 | set_gdbarch_value_to_register (gdbarch, i387_value_to_register); | |
3076 | ||
efb1c01c | 3077 | set_gdbarch_return_value (gdbarch, amd64_return_value); |
53e95fcf | 3078 | |
e53bef9f | 3079 | set_gdbarch_skip_prologue (gdbarch, amd64_skip_prologue); |
53e95fcf | 3080 | |
cf648174 HZ |
3081 | tdep->record_regmap = amd64_record_regmap; |
3082 | ||
10458914 | 3083 | set_gdbarch_dummy_id (gdbarch, amd64_dummy_id); |
53e95fcf | 3084 | |
872761f4 MS |
3085 | /* Hook the function epilogue frame unwinder. This unwinder is |
3086 | appended to the list first, so that it supercedes the other | |
3087 | unwinders in function epilogues. */ | |
3088 | frame_unwind_prepend_unwinder (gdbarch, &amd64_epilogue_frame_unwind); | |
3089 | ||
3090 | /* Hook the prologue-based frame unwinders. */ | |
10458914 DJ |
3091 | frame_unwind_append_unwinder (gdbarch, &amd64_sigtramp_frame_unwind); |
3092 | frame_unwind_append_unwinder (gdbarch, &amd64_frame_unwind); | |
e53bef9f | 3093 | frame_base_set_default (gdbarch, &amd64_frame_base); |
c6b33596 | 3094 | |
436675d3 | 3095 | set_gdbarch_get_longjmp_target (gdbarch, amd64_get_longjmp_target); |
dde08ee1 PA |
3096 | |
3097 | set_gdbarch_relocate_instruction (gdbarch, amd64_relocate_instruction); | |
6710bf39 SS |
3098 | |
3099 | set_gdbarch_gen_return_address (gdbarch, amd64_gen_return_address); | |
55aa24fb SDJ |
3100 | |
3101 | /* SystemTap variables and functions. */ | |
05c0465e SDJ |
3102 | set_gdbarch_stap_integer_prefixes (gdbarch, stap_integer_prefixes); |
3103 | set_gdbarch_stap_register_prefixes (gdbarch, stap_register_prefixes); | |
3104 | set_gdbarch_stap_register_indirection_prefixes (gdbarch, | |
3105 | stap_register_indirection_prefixes); | |
3106 | set_gdbarch_stap_register_indirection_suffixes (gdbarch, | |
3107 | stap_register_indirection_suffixes); | |
55aa24fb SDJ |
3108 | set_gdbarch_stap_is_single_operand (gdbarch, |
3109 | i386_stap_is_single_operand); | |
3110 | set_gdbarch_stap_parse_special_token (gdbarch, | |
3111 | i386_stap_parse_special_token); | |
c2170eef MM |
3112 | set_gdbarch_insn_is_call (gdbarch, amd64_insn_is_call); |
3113 | set_gdbarch_insn_is_ret (gdbarch, amd64_insn_is_ret); | |
3114 | set_gdbarch_insn_is_jump (gdbarch, amd64_insn_is_jump); | |
c4f35dd8 | 3115 | } |
fff4548b MK |
3116 | \f |
3117 | ||
3118 | static struct type * | |
3119 | amd64_x32_pseudo_register_type (struct gdbarch *gdbarch, int regnum) | |
3120 | { | |
3121 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
3122 | ||
3123 | switch (regnum - tdep->eax_regnum) | |
3124 | { | |
3125 | case AMD64_RBP_REGNUM: /* %ebp */ | |
3126 | case AMD64_RSP_REGNUM: /* %esp */ | |
3127 | return builtin_type (gdbarch)->builtin_data_ptr; | |
3128 | case AMD64_RIP_REGNUM: /* %eip */ | |
3129 | return builtin_type (gdbarch)->builtin_func_ptr; | |
3130 | } | |
3131 | ||
3132 | return i386_pseudo_register_type (gdbarch, regnum); | |
3133 | } | |
3134 | ||
3135 | void | |
3136 | amd64_x32_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
3137 | { | |
3138 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
3139 | const struct target_desc *tdesc = info.target_desc; | |
3140 | ||
3141 | amd64_init_abi (info, gdbarch); | |
3142 | ||
3143 | if (! tdesc_has_registers (tdesc)) | |
3144 | tdesc = tdesc_x32; | |
3145 | tdep->tdesc = tdesc; | |
3146 | ||
3147 | tdep->num_dword_regs = 17; | |
3148 | set_tdesc_pseudo_register_type (gdbarch, amd64_x32_pseudo_register_type); | |
3149 | ||
3150 | set_gdbarch_long_bit (gdbarch, 32); | |
3151 | set_gdbarch_ptr_bit (gdbarch, 32); | |
3152 | } | |
90884b2b | 3153 | |
97de3545 JB |
3154 | /* Return the target description for a specified XSAVE feature mask. */ |
3155 | ||
3156 | const struct target_desc * | |
3157 | amd64_target_description (uint64_t xcr0) | |
3158 | { | |
3159 | switch (xcr0 & X86_XSTATE_ALL_MASK) | |
3160 | { | |
3161 | case X86_XSTATE_MPX_AVX512_MASK: | |
3162 | case X86_XSTATE_AVX512_MASK: | |
3163 | return tdesc_amd64_avx512; | |
3164 | case X86_XSTATE_MPX_MASK: | |
3165 | return tdesc_amd64_mpx; | |
3166 | case X86_XSTATE_AVX_MASK: | |
3167 | return tdesc_amd64_avx; | |
3168 | default: | |
3169 | return tdesc_amd64; | |
3170 | } | |
3171 | } | |
3172 | ||
90884b2b L |
3173 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
3174 | void _initialize_amd64_tdep (void); | |
3175 | ||
3176 | void | |
3177 | _initialize_amd64_tdep (void) | |
3178 | { | |
3179 | initialize_tdesc_amd64 (); | |
a055a187 | 3180 | initialize_tdesc_amd64_avx (); |
e43e105e | 3181 | initialize_tdesc_amd64_mpx (); |
01f9f808 MS |
3182 | initialize_tdesc_amd64_avx512 (); |
3183 | ||
ac1438b5 L |
3184 | initialize_tdesc_x32 (); |
3185 | initialize_tdesc_x32_avx (); | |
01f9f808 | 3186 | initialize_tdesc_x32_avx512 (); |
90884b2b | 3187 | } |
c4f35dd8 MK |
3188 | \f |
3189 | ||
41d041d6 MK |
3190 | /* The 64-bit FXSAVE format differs from the 32-bit format in the |
3191 | sense that the instruction pointer and data pointer are simply | |
3192 | 64-bit offsets into the code segment and the data segment instead | |
3193 | of a selector offset pair. The functions below store the upper 32 | |
3194 | bits of these pointers (instead of just the 16-bits of the segment | |
3195 | selector). */ | |
3196 | ||
3197 | /* Fill register REGNUM in REGCACHE with the appropriate | |
0485f6ad MK |
3198 | floating-point or SSE register value from *FXSAVE. If REGNUM is |
3199 | -1, do this for all registers. This function masks off any of the | |
3200 | reserved bits in *FXSAVE. */ | |
c4f35dd8 MK |
3201 | |
3202 | void | |
90f90721 | 3203 | amd64_supply_fxsave (struct regcache *regcache, int regnum, |
20a6ec49 | 3204 | const void *fxsave) |
c4f35dd8 | 3205 | { |
20a6ec49 MD |
3206 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
3207 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
3208 | ||
41d041d6 | 3209 | i387_supply_fxsave (regcache, regnum, fxsave); |
c4f35dd8 | 3210 | |
233dfcf0 L |
3211 | if (fxsave |
3212 | && gdbarch_bfd_arch_info (gdbarch)->bits_per_word == 64) | |
c4f35dd8 | 3213 | { |
9a3c8263 | 3214 | const gdb_byte *regs = (const gdb_byte *) fxsave; |
41d041d6 | 3215 | |
20a6ec49 MD |
3216 | if (regnum == -1 || regnum == I387_FISEG_REGNUM (tdep)) |
3217 | regcache_raw_supply (regcache, I387_FISEG_REGNUM (tdep), regs + 12); | |
3218 | if (regnum == -1 || regnum == I387_FOSEG_REGNUM (tdep)) | |
3219 | regcache_raw_supply (regcache, I387_FOSEG_REGNUM (tdep), regs + 20); | |
c4f35dd8 | 3220 | } |
0c1a73d6 MK |
3221 | } |
3222 | ||
a055a187 L |
3223 | /* Similar to amd64_supply_fxsave, but use XSAVE extended state. */ |
3224 | ||
3225 | void | |
3226 | amd64_supply_xsave (struct regcache *regcache, int regnum, | |
3227 | const void *xsave) | |
3228 | { | |
3229 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
3230 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
3231 | ||
3232 | i387_supply_xsave (regcache, regnum, xsave); | |
3233 | ||
233dfcf0 L |
3234 | if (xsave |
3235 | && gdbarch_bfd_arch_info (gdbarch)->bits_per_word == 64) | |
a055a187 | 3236 | { |
9a3c8263 | 3237 | const gdb_byte *regs = (const gdb_byte *) xsave; |
a055a187 L |
3238 | |
3239 | if (regnum == -1 || regnum == I387_FISEG_REGNUM (tdep)) | |
3240 | regcache_raw_supply (regcache, I387_FISEG_REGNUM (tdep), | |
3241 | regs + 12); | |
3242 | if (regnum == -1 || regnum == I387_FOSEG_REGNUM (tdep)) | |
3243 | regcache_raw_supply (regcache, I387_FOSEG_REGNUM (tdep), | |
3244 | regs + 20); | |
3245 | } | |
3246 | } | |
3247 | ||
3c017e40 MK |
3248 | /* Fill register REGNUM (if it is a floating-point or SSE register) in |
3249 | *FXSAVE with the value from REGCACHE. If REGNUM is -1, do this for | |
3250 | all registers. This function doesn't touch any of the reserved | |
3251 | bits in *FXSAVE. */ | |
3252 | ||
3253 | void | |
3254 | amd64_collect_fxsave (const struct regcache *regcache, int regnum, | |
3255 | void *fxsave) | |
3256 | { | |
20a6ec49 MD |
3257 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
3258 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
9a3c8263 | 3259 | gdb_byte *regs = (gdb_byte *) fxsave; |
3c017e40 MK |
3260 | |
3261 | i387_collect_fxsave (regcache, regnum, fxsave); | |
3262 | ||
233dfcf0 | 3263 | if (gdbarch_bfd_arch_info (gdbarch)->bits_per_word == 64) |
f0ef85a5 | 3264 | { |
20a6ec49 MD |
3265 | if (regnum == -1 || regnum == I387_FISEG_REGNUM (tdep)) |
3266 | regcache_raw_collect (regcache, I387_FISEG_REGNUM (tdep), regs + 12); | |
3267 | if (regnum == -1 || regnum == I387_FOSEG_REGNUM (tdep)) | |
3268 | regcache_raw_collect (regcache, I387_FOSEG_REGNUM (tdep), regs + 20); | |
f0ef85a5 | 3269 | } |
3c017e40 | 3270 | } |
a055a187 | 3271 | |
7a9dd1b2 | 3272 | /* Similar to amd64_collect_fxsave, but use XSAVE extended state. */ |
a055a187 L |
3273 | |
3274 | void | |
3275 | amd64_collect_xsave (const struct regcache *regcache, int regnum, | |
3276 | void *xsave, int gcore) | |
3277 | { | |
3278 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
3279 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
9a3c8263 | 3280 | gdb_byte *regs = (gdb_byte *) xsave; |
a055a187 L |
3281 | |
3282 | i387_collect_xsave (regcache, regnum, xsave, gcore); | |
3283 | ||
233dfcf0 | 3284 | if (gdbarch_bfd_arch_info (gdbarch)->bits_per_word == 64) |
a055a187 L |
3285 | { |
3286 | if (regnum == -1 || regnum == I387_FISEG_REGNUM (tdep)) | |
3287 | regcache_raw_collect (regcache, I387_FISEG_REGNUM (tdep), | |
3288 | regs + 12); | |
3289 | if (regnum == -1 || regnum == I387_FOSEG_REGNUM (tdep)) | |
3290 | regcache_raw_collect (regcache, I387_FOSEG_REGNUM (tdep), | |
3291 | regs + 20); | |
3292 | } | |
3293 | } |