1 /* Target-dependent code for AMD64.
3 Copyright (C) 2001, 2002, 2003, 2004, 2005 Free Software Foundation,
4 Inc. Contributed by Jiri Smid, SuSE Labs.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street, Fifth Floor,
21 Boston, MA 02110-1301, USA. */
24 #include "arch-utils.h"
26 #include "dummy-frame.h"
28 #include "frame-base.h"
29 #include "frame-unwind.h"
38 #include "gdb_assert.h"
40 #include "amd64-tdep.h"
41 #include "i387-tdep.h"
43 /* Note that the AMD64 architecture was previously known as x86-64.
44 The latter is (forever) engraved into the canonical system name as
45 returned by config.guess, and used as the name for the AMD64 port
46 of GNU/Linux. The BSD's have renamed their ports to amd64; they
47 don't like to shout. For GDB we prefer the amd64_-prefix over the
48 x86_64_-prefix since it's so much easier to type. */
50 /* Register information. */
52 struct amd64_register_info
58 static struct type *amd64_sse_type;
60 static struct amd64_register_info const amd64_register_info[] =
62 { "rax", &builtin_type_int64 },
63 { "rbx", &builtin_type_int64 },
64 { "rcx", &builtin_type_int64 },
65 { "rdx", &builtin_type_int64 },
66 { "rsi", &builtin_type_int64 },
67 { "rdi", &builtin_type_int64 },
68 { "rbp", &builtin_type_void_data_ptr },
69 { "rsp", &builtin_type_void_data_ptr },
71 /* %r8 is indeed register number 8. */
72 { "r8", &builtin_type_int64 },
73 { "r9", &builtin_type_int64 },
74 { "r10", &builtin_type_int64 },
75 { "r11", &builtin_type_int64 },
76 { "r12", &builtin_type_int64 },
77 { "r13", &builtin_type_int64 },
78 { "r14", &builtin_type_int64 },
79 { "r15", &builtin_type_int64 },
80 { "rip", &builtin_type_void_func_ptr },
81 { "eflags", &builtin_type_int32 },
82 { "cs", &builtin_type_int32 },
83 { "ss", &builtin_type_int32 },
84 { "ds", &builtin_type_int32 },
85 { "es", &builtin_type_int32 },
86 { "fs", &builtin_type_int32 },
87 { "gs", &builtin_type_int32 },
89 /* %st0 is register number 24. */
90 { "st0", &builtin_type_i387_ext },
91 { "st1", &builtin_type_i387_ext },
92 { "st2", &builtin_type_i387_ext },
93 { "st3", &builtin_type_i387_ext },
94 { "st4", &builtin_type_i387_ext },
95 { "st5", &builtin_type_i387_ext },
96 { "st6", &builtin_type_i387_ext },
97 { "st7", &builtin_type_i387_ext },
98 { "fctrl", &builtin_type_int32 },
99 { "fstat", &builtin_type_int32 },
100 { "ftag", &builtin_type_int32 },
101 { "fiseg", &builtin_type_int32 },
102 { "fioff", &builtin_type_int32 },
103 { "foseg", &builtin_type_int32 },
104 { "fooff", &builtin_type_int32 },
105 { "fop", &builtin_type_int32 },
107 /* %xmm0 is register number 40. */
108 { "xmm0", &amd64_sse_type },
109 { "xmm1", &amd64_sse_type },
110 { "xmm2", &amd64_sse_type },
111 { "xmm3", &amd64_sse_type },
112 { "xmm4", &amd64_sse_type },
113 { "xmm5", &amd64_sse_type },
114 { "xmm6", &amd64_sse_type },
115 { "xmm7", &amd64_sse_type },
116 { "xmm8", &amd64_sse_type },
117 { "xmm9", &amd64_sse_type },
118 { "xmm10", &amd64_sse_type },
119 { "xmm11", &amd64_sse_type },
120 { "xmm12", &amd64_sse_type },
121 { "xmm13", &amd64_sse_type },
122 { "xmm14", &amd64_sse_type },
123 { "xmm15", &amd64_sse_type },
124 { "mxcsr", &builtin_type_int32 }
127 /* Total number of registers. */
128 #define AMD64_NUM_REGS \
129 (sizeof (amd64_register_info) / sizeof (amd64_register_info[0]))
131 /* Return the name of register REGNUM. */
134 amd64_register_name (int regnum)
136 if (regnum >= 0 && regnum < AMD64_NUM_REGS)
137 return amd64_register_info[regnum].name;
142 /* Return the GDB type object for the "standard" data type of data in
146 amd64_register_type (struct gdbarch *gdbarch, int regnum)
150 gdb_assert (regnum >= 0 && regnum < AMD64_NUM_REGS);
152 /* ??? Unfortunately, amd64_init_abi is called too early, and so we
153 cannot create the amd64_sse_type early enough to avoid any check
155 t = *amd64_register_info[regnum].type;
159 gdb_assert (amd64_sse_type == NULL);
161 t = init_composite_type ("__gdb_builtin_type_vec128i", TYPE_CODE_UNION);
162 append_composite_type_field (t, "v4_float", builtin_type_v4_float);
163 append_composite_type_field (t, "v2_double", builtin_type_v2_double);
164 append_composite_type_field (t, "v16_int8", builtin_type_v16_int8);
165 append_composite_type_field (t, "v8_int16", builtin_type_v8_int16);
166 append_composite_type_field (t, "v4_int32", builtin_type_v4_int32);
167 append_composite_type_field (t, "v2_int64", builtin_type_v2_int64);
168 append_composite_type_field (t, "uint128", builtin_type_int128);
170 TYPE_FLAGS (t) |= TYPE_FLAG_VECTOR;
171 TYPE_NAME (t) = "builtin_type_vec128i";
177 /* DWARF Register Number Mapping as defined in the System V psABI,
180 static int amd64_dwarf_regmap[] =
182 /* General Purpose Registers RAX, RDX, RCX, RBX, RSI, RDI. */
183 AMD64_RAX_REGNUM, AMD64_RDX_REGNUM,
184 AMD64_RCX_REGNUM, AMD64_RBX_REGNUM,
185 AMD64_RSI_REGNUM, AMD64_RDI_REGNUM,
187 /* Frame Pointer Register RBP. */
190 /* Stack Pointer Register RSP. */
193 /* Extended Integer Registers 8 - 15. */
194 8, 9, 10, 11, 12, 13, 14, 15,
196 /* Return Address RA. Mapped to RIP. */
199 /* SSE Registers 0 - 7. */
200 AMD64_XMM0_REGNUM + 0, AMD64_XMM1_REGNUM,
201 AMD64_XMM0_REGNUM + 2, AMD64_XMM0_REGNUM + 3,
202 AMD64_XMM0_REGNUM + 4, AMD64_XMM0_REGNUM + 5,
203 AMD64_XMM0_REGNUM + 6, AMD64_XMM0_REGNUM + 7,
205 /* Extended SSE Registers 8 - 15. */
206 AMD64_XMM0_REGNUM + 8, AMD64_XMM0_REGNUM + 9,
207 AMD64_XMM0_REGNUM + 10, AMD64_XMM0_REGNUM + 11,
208 AMD64_XMM0_REGNUM + 12, AMD64_XMM0_REGNUM + 13,
209 AMD64_XMM0_REGNUM + 14, AMD64_XMM0_REGNUM + 15,
211 /* Floating Point Registers 0-7. */
212 AMD64_ST0_REGNUM + 0, AMD64_ST0_REGNUM + 1,
213 AMD64_ST0_REGNUM + 2, AMD64_ST0_REGNUM + 3,
214 AMD64_ST0_REGNUM + 4, AMD64_ST0_REGNUM + 5,
215 AMD64_ST0_REGNUM + 6, AMD64_ST0_REGNUM + 7,
217 /* Control and Status Flags Register. */
220 /* Selector Registers. */
230 /* Segment Base Address Registers. */
236 /* Special Selector Registers. */
240 /* Floating Point Control Registers. */
246 static const int amd64_dwarf_regmap_len =
247 (sizeof (amd64_dwarf_regmap) / sizeof (amd64_dwarf_regmap[0]));
249 /* Convert DWARF register number REG to the appropriate register
250 number used by GDB. */
253 amd64_dwarf_reg_to_regnum (int reg)
257 if (reg >= 0 && reg < amd64_dwarf_regmap_len)
258 regnum = amd64_dwarf_regmap[reg];
261 warning (_("Unmapped DWARF Register #%d encountered."), reg);
266 /* Return nonzero if a value of type TYPE stored in register REGNUM
267 needs any special handling. */
270 amd64_convert_register_p (int regnum, struct type *type)
272 return i386_fp_regnum_p (regnum);
276 /* Register classes as defined in the psABI. */
290 /* Return the union class of CLASS1 and CLASS2. See the psABI for
293 static enum amd64_reg_class
294 amd64_merge_classes (enum amd64_reg_class class1, enum amd64_reg_class class2)
296 /* Rule (a): If both classes are equal, this is the resulting class. */
297 if (class1 == class2)
300 /* Rule (b): If one of the classes is NO_CLASS, the resulting class
301 is the other class. */
302 if (class1 == AMD64_NO_CLASS)
304 if (class2 == AMD64_NO_CLASS)
307 /* Rule (c): If one of the classes is MEMORY, the result is MEMORY. */
308 if (class1 == AMD64_MEMORY || class2 == AMD64_MEMORY)
311 /* Rule (d): If one of the classes is INTEGER, the result is INTEGER. */
312 if (class1 == AMD64_INTEGER || class2 == AMD64_INTEGER)
313 return AMD64_INTEGER;
315 /* Rule (e): If one of the classes is X87, X87UP, COMPLEX_X87 class,
316 MEMORY is used as class. */
317 if (class1 == AMD64_X87 || class1 == AMD64_X87UP
318 || class1 == AMD64_COMPLEX_X87 || class2 == AMD64_X87
319 || class2 == AMD64_X87UP || class2 == AMD64_COMPLEX_X87)
322 /* Rule (f): Otherwise class SSE is used. */
326 static void amd64_classify (struct type *type, enum amd64_reg_class class[2]);
328 /* Return non-zero if TYPE is a non-POD structure or union type. */
331 amd64_non_pod_p (struct type *type)
333 /* ??? A class with a base class certainly isn't POD, but does this
334 catch all non-POD structure types? */
335 if (TYPE_CODE (type) == TYPE_CODE_STRUCT && TYPE_N_BASECLASSES (type) > 0)
341 /* Classify TYPE according to the rules for aggregate (structures and
342 arrays) and union types, and store the result in CLASS. */
345 amd64_classify_aggregate (struct type *type, enum amd64_reg_class class[2])
347 int len = TYPE_LENGTH (type);
349 /* 1. If the size of an object is larger than two eightbytes, or in
350 C++, is a non-POD structure or union type, or contains
351 unaligned fields, it has class memory. */
352 if (len > 16 || amd64_non_pod_p (type))
354 class[0] = class[1] = AMD64_MEMORY;
358 /* 2. Both eightbytes get initialized to class NO_CLASS. */
359 class[0] = class[1] = AMD64_NO_CLASS;
361 /* 3. Each field of an object is classified recursively so that
362 always two fields are considered. The resulting class is
363 calculated according to the classes of the fields in the
366 if (TYPE_CODE (type) == TYPE_CODE_ARRAY)
368 struct type *subtype = check_typedef (TYPE_TARGET_TYPE (type));
370 /* All fields in an array have the same type. */
371 amd64_classify (subtype, class);
372 if (len > 8 && class[1] == AMD64_NO_CLASS)
379 /* Structure or union. */
380 gdb_assert (TYPE_CODE (type) == TYPE_CODE_STRUCT
381 || TYPE_CODE (type) == TYPE_CODE_UNION);
383 for (i = 0; i < TYPE_NFIELDS (type); i++)
385 struct type *subtype = check_typedef (TYPE_FIELD_TYPE (type, i));
386 int pos = TYPE_FIELD_BITPOS (type, i) / 64;
387 enum amd64_reg_class subclass[2];
389 /* Ignore static fields. */
390 if (TYPE_FIELD_STATIC (type, i))
393 gdb_assert (pos == 0 || pos == 1);
395 amd64_classify (subtype, subclass);
396 class[pos] = amd64_merge_classes (class[pos], subclass[0]);
398 class[1] = amd64_merge_classes (class[1], subclass[1]);
402 /* 4. Then a post merger cleanup is done: */
404 /* Rule (a): If one of the classes is MEMORY, the whole argument is
406 if (class[0] == AMD64_MEMORY || class[1] == AMD64_MEMORY)
407 class[0] = class[1] = AMD64_MEMORY;
409 /* Rule (b): If SSEUP is not preceeded by SSE, it is converted to
411 if (class[0] == AMD64_SSEUP)
412 class[0] = AMD64_SSE;
413 if (class[1] == AMD64_SSEUP && class[0] != AMD64_SSE)
414 class[1] = AMD64_SSE;
417 /* Classify TYPE, and store the result in CLASS. */
420 amd64_classify (struct type *type, enum amd64_reg_class class[2])
422 enum type_code code = TYPE_CODE (type);
423 int len = TYPE_LENGTH (type);
425 class[0] = class[1] = AMD64_NO_CLASS;
427 /* Arguments of types (signed and unsigned) _Bool, char, short, int,
428 long, long long, and pointers are in the INTEGER class. Similarly,
429 range types, used by languages such as Ada, are also in the INTEGER
431 if ((code == TYPE_CODE_INT || code == TYPE_CODE_ENUM
432 || code == TYPE_CODE_RANGE
433 || code == TYPE_CODE_PTR || code == TYPE_CODE_REF)
434 && (len == 1 || len == 2 || len == 4 || len == 8))
435 class[0] = AMD64_INTEGER;
437 /* Arguments of types float, double and __m64 are in class SSE. */
438 else if (code == TYPE_CODE_FLT && (len == 4 || len == 8))
440 class[0] = AMD64_SSE;
442 /* Arguments of types __float128 and __m128 are split into two
443 halves. The least significant ones belong to class SSE, the most
444 significant one to class SSEUP. */
445 /* FIXME: __float128, __m128. */
447 /* The 64-bit mantissa of arguments of type long double belongs to
448 class X87, the 16-bit exponent plus 6 bytes of padding belongs to
450 else if (code == TYPE_CODE_FLT && len == 16)
451 /* Class X87 and X87UP. */
452 class[0] = AMD64_X87, class[1] = AMD64_X87UP;
455 else if (code == TYPE_CODE_ARRAY || code == TYPE_CODE_STRUCT
456 || code == TYPE_CODE_UNION)
457 amd64_classify_aggregate (type, class);
460 static enum return_value_convention
461 amd64_return_value (struct gdbarch *gdbarch, struct type *type,
462 struct regcache *regcache,
463 gdb_byte *readbuf, const gdb_byte *writebuf)
465 enum amd64_reg_class class[2];
466 int len = TYPE_LENGTH (type);
467 static int integer_regnum[] = { AMD64_RAX_REGNUM, AMD64_RDX_REGNUM };
468 static int sse_regnum[] = { AMD64_XMM0_REGNUM, AMD64_XMM1_REGNUM };
473 gdb_assert (!(readbuf && writebuf));
475 /* 1. Classify the return type with the classification algorithm. */
476 amd64_classify (type, class);
478 /* 2. If the type has class MEMORY, then the caller provides space
479 for the return value and passes the address of this storage in
480 %rdi as if it were the first argument to the function. In effect,
481 this address becomes a hidden first argument.
483 On return %rax will contain the address that has been passed in
484 by the caller in %rdi. */
485 if (class[0] == AMD64_MEMORY)
487 /* As indicated by the comment above, the ABI guarantees that we
488 can always find the return value just after the function has
495 regcache_raw_read_unsigned (regcache, AMD64_RAX_REGNUM, &addr);
496 read_memory (addr, readbuf, TYPE_LENGTH (type));
499 return RETURN_VALUE_ABI_RETURNS_ADDRESS;
502 gdb_assert (class[1] != AMD64_MEMORY);
503 gdb_assert (len <= 16);
505 for (i = 0; len > 0; i++, len -= 8)
513 /* 3. If the class is INTEGER, the next available register
514 of the sequence %rax, %rdx is used. */
515 regnum = integer_regnum[integer_reg++];
519 /* 4. If the class is SSE, the next available SSE register
520 of the sequence %xmm0, %xmm1 is used. */
521 regnum = sse_regnum[sse_reg++];
525 /* 5. If the class is SSEUP, the eightbyte is passed in the
526 upper half of the last used SSE register. */
527 gdb_assert (sse_reg > 0);
528 regnum = sse_regnum[sse_reg - 1];
533 /* 6. If the class is X87, the value is returned on the X87
534 stack in %st0 as 80-bit x87 number. */
535 regnum = AMD64_ST0_REGNUM;
537 i387_return_value (gdbarch, regcache);
541 /* 7. If the class is X87UP, the value is returned together
542 with the previous X87 value in %st0. */
543 gdb_assert (i > 0 && class[0] == AMD64_X87);
544 regnum = AMD64_ST0_REGNUM;
553 gdb_assert (!"Unexpected register class.");
556 gdb_assert (regnum != -1);
559 regcache_raw_read_part (regcache, regnum, offset, min (len, 8),
562 regcache_raw_write_part (regcache, regnum, offset, min (len, 8),
566 return RETURN_VALUE_REGISTER_CONVENTION;
571 amd64_push_arguments (struct regcache *regcache, int nargs,
572 struct value **args, CORE_ADDR sp, int struct_return)
574 static int integer_regnum[] =
576 AMD64_RDI_REGNUM, /* %rdi */
577 AMD64_RSI_REGNUM, /* %rsi */
578 AMD64_RDX_REGNUM, /* %rdx */
579 AMD64_RCX_REGNUM, /* %rcx */
583 static int sse_regnum[] =
585 /* %xmm0 ... %xmm7 */
586 AMD64_XMM0_REGNUM + 0, AMD64_XMM1_REGNUM,
587 AMD64_XMM0_REGNUM + 2, AMD64_XMM0_REGNUM + 3,
588 AMD64_XMM0_REGNUM + 4, AMD64_XMM0_REGNUM + 5,
589 AMD64_XMM0_REGNUM + 6, AMD64_XMM0_REGNUM + 7,
591 struct value **stack_args = alloca (nargs * sizeof (struct value *));
592 int num_stack_args = 0;
593 int num_elements = 0;
599 /* Reserve a register for the "hidden" argument. */
603 for (i = 0; i < nargs; i++)
605 struct type *type = value_type (args[i]);
606 int len = TYPE_LENGTH (type);
607 enum amd64_reg_class class[2];
608 int needed_integer_regs = 0;
609 int needed_sse_regs = 0;
612 /* Classify argument. */
613 amd64_classify (type, class);
615 /* Calculate the number of integer and SSE registers needed for
617 for (j = 0; j < 2; j++)
619 if (class[j] == AMD64_INTEGER)
620 needed_integer_regs++;
621 else if (class[j] == AMD64_SSE)
625 /* Check whether enough registers are available, and if the
626 argument should be passed in registers at all. */
627 if (integer_reg + needed_integer_regs > ARRAY_SIZE (integer_regnum)
628 || sse_reg + needed_sse_regs > ARRAY_SIZE (sse_regnum)
629 || (needed_integer_regs == 0 && needed_sse_regs == 0))
631 /* The argument will be passed on the stack. */
632 num_elements += ((len + 7) / 8);
633 stack_args[num_stack_args++] = args[i];
637 /* The argument will be passed in registers. */
638 const gdb_byte *valbuf = value_contents (args[i]);
641 gdb_assert (len <= 16);
643 for (j = 0; len > 0; j++, len -= 8)
651 regnum = integer_regnum[integer_reg++];
655 regnum = sse_regnum[sse_reg++];
659 gdb_assert (sse_reg > 0);
660 regnum = sse_regnum[sse_reg - 1];
665 gdb_assert (!"Unexpected register class.");
668 gdb_assert (regnum != -1);
669 memset (buf, 0, sizeof buf);
670 memcpy (buf, valbuf + j * 8, min (len, 8));
671 regcache_raw_write_part (regcache, regnum, offset, 8, buf);
676 /* Allocate space for the arguments on the stack. */
677 sp -= num_elements * 8;
679 /* The psABI says that "The end of the input argument area shall be
680 aligned on a 16 byte boundary." */
683 /* Write out the arguments to the stack. */
684 for (i = 0; i < num_stack_args; i++)
686 struct type *type = value_type (stack_args[i]);
687 const gdb_byte *valbuf = value_contents (stack_args[i]);
688 int len = TYPE_LENGTH (type);
690 write_memory (sp + element * 8, valbuf, len);
691 element += ((len + 7) / 8);
694 /* The psABI says that "For calls that may call functions that use
695 varargs or stdargs (prototype-less calls or calls to functions
696 containing ellipsis (...) in the declaration) %al is used as
697 hidden argument to specify the number of SSE registers used. */
698 regcache_raw_write_unsigned (regcache, AMD64_RAX_REGNUM, sse_reg);
703 amd64_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
704 struct regcache *regcache, CORE_ADDR bp_addr,
705 int nargs, struct value **args, CORE_ADDR sp,
706 int struct_return, CORE_ADDR struct_addr)
710 /* Pass arguments. */
711 sp = amd64_push_arguments (regcache, nargs, args, sp, struct_return);
713 /* Pass "hidden" argument". */
716 store_unsigned_integer (buf, 8, struct_addr);
717 regcache_cooked_write (regcache, AMD64_RDI_REGNUM, buf);
720 /* Store return address. */
722 store_unsigned_integer (buf, 8, bp_addr);
723 write_memory (sp, buf, 8);
725 /* Finally, update the stack pointer... */
726 store_unsigned_integer (buf, 8, sp);
727 regcache_cooked_write (regcache, AMD64_RSP_REGNUM, buf);
729 /* ...and fake a frame pointer. */
730 regcache_cooked_write (regcache, AMD64_RBP_REGNUM, buf);
736 /* The maximum number of saved registers. This should include %rip. */
737 #define AMD64_NUM_SAVED_REGS AMD64_NUM_GREGS
739 struct amd64_frame_cache
746 /* Saved registers. */
747 CORE_ADDR saved_regs[AMD64_NUM_SAVED_REGS];
750 /* Do we have a frame? */
754 /* Allocate and initialize a frame cache. */
756 static struct amd64_frame_cache *
757 amd64_alloc_frame_cache (void)
759 struct amd64_frame_cache *cache;
762 cache = FRAME_OBSTACK_ZALLOC (struct amd64_frame_cache);
766 cache->sp_offset = -8;
769 /* Saved registers. We initialize these to -1 since zero is a valid
770 offset (that's where %rbp is supposed to be stored). */
771 for (i = 0; i < AMD64_NUM_SAVED_REGS; i++)
772 cache->saved_regs[i] = -1;
775 /* Frameless until proven otherwise. */
776 cache->frameless_p = 1;
781 /* Do a limited analysis of the prologue at PC and update CACHE
782 accordingly. Bail out early if CURRENT_PC is reached. Return the
783 address where the analysis stopped.
785 We will handle only functions beginning with:
788 movq %rsp, %rbp 0x48 0x89 0xe5
790 Any function that doesn't start with this sequence will be assumed
791 to have no prologue and thus no valid frame pointer in %rbp. */
794 amd64_analyze_prologue (CORE_ADDR pc, CORE_ADDR current_pc,
795 struct amd64_frame_cache *cache)
797 static gdb_byte proto[3] = { 0x48, 0x89, 0xe5 }; /* movq %rsp, %rbp */
801 if (current_pc <= pc)
804 op = read_memory_unsigned_integer (pc, 1);
806 if (op == 0x55) /* pushq %rbp */
808 /* Take into account that we've executed the `pushq %rbp' that
809 starts this instruction sequence. */
810 cache->saved_regs[AMD64_RBP_REGNUM] = 0;
811 cache->sp_offset += 8;
813 /* If that's all, return now. */
814 if (current_pc <= pc + 1)
817 /* Check for `movq %rsp, %rbp'. */
818 read_memory (pc + 1, buf, 3);
819 if (memcmp (buf, proto, 3) != 0)
822 /* OK, we actually have a frame. */
823 cache->frameless_p = 0;
830 /* Return PC of first real instruction. */
833 amd64_skip_prologue (CORE_ADDR start_pc)
835 struct amd64_frame_cache cache;
838 pc = amd64_analyze_prologue (start_pc, 0xffffffffffffffffLL, &cache);
839 if (cache.frameless_p)
848 static struct amd64_frame_cache *
849 amd64_frame_cache (struct frame_info *next_frame, void **this_cache)
851 struct amd64_frame_cache *cache;
858 cache = amd64_alloc_frame_cache ();
861 cache->pc = frame_func_unwind (next_frame);
863 amd64_analyze_prologue (cache->pc, frame_pc_unwind (next_frame), cache);
865 if (cache->frameless_p)
867 /* We didn't find a valid frame. If we're at the start of a
868 function, or somewhere half-way its prologue, the function's
869 frame probably hasn't been fully setup yet. Try to
870 reconstruct the base address for the stack frame by looking
871 at the stack pointer. For truly "frameless" functions this
874 frame_unwind_register (next_frame, AMD64_RSP_REGNUM, buf);
875 cache->base = extract_unsigned_integer (buf, 8) + cache->sp_offset;
879 frame_unwind_register (next_frame, AMD64_RBP_REGNUM, buf);
880 cache->base = extract_unsigned_integer (buf, 8);
883 /* Now that we have the base address for the stack frame we can
884 calculate the value of %rsp in the calling frame. */
885 cache->saved_sp = cache->base + 16;
887 /* For normal frames, %rip is stored at 8(%rbp). If we don't have a
888 frame we find it at the same offset from the reconstructed base
890 cache->saved_regs[AMD64_RIP_REGNUM] = 8;
892 /* Adjust all the saved registers such that they contain addresses
893 instead of offsets. */
894 for (i = 0; i < AMD64_NUM_SAVED_REGS; i++)
895 if (cache->saved_regs[i] != -1)
896 cache->saved_regs[i] += cache->base;
902 amd64_frame_this_id (struct frame_info *next_frame, void **this_cache,
903 struct frame_id *this_id)
905 struct amd64_frame_cache *cache =
906 amd64_frame_cache (next_frame, this_cache);
908 /* This marks the outermost frame. */
909 if (cache->base == 0)
912 (*this_id) = frame_id_build (cache->base + 16, cache->pc);
916 amd64_frame_prev_register (struct frame_info *next_frame, void **this_cache,
917 int regnum, int *optimizedp,
918 enum lval_type *lvalp, CORE_ADDR *addrp,
919 int *realnump, gdb_byte *valuep)
921 struct amd64_frame_cache *cache =
922 amd64_frame_cache (next_frame, this_cache);
924 gdb_assert (regnum >= 0);
926 if (regnum == SP_REGNUM && cache->saved_sp)
934 /* Store the value. */
935 store_unsigned_integer (valuep, 8, cache->saved_sp);
940 if (regnum < AMD64_NUM_SAVED_REGS && cache->saved_regs[regnum] != -1)
943 *lvalp = lval_memory;
944 *addrp = cache->saved_regs[regnum];
948 /* Read the value in from memory. */
949 read_memory (*addrp, valuep,
950 register_size (current_gdbarch, regnum));
956 *lvalp = lval_register;
960 frame_unwind_register (next_frame, (*realnump), valuep);
963 static const struct frame_unwind amd64_frame_unwind =
967 amd64_frame_prev_register
970 static const struct frame_unwind *
971 amd64_frame_sniffer (struct frame_info *next_frame)
973 return &amd64_frame_unwind;
977 /* Signal trampolines. */
979 /* FIXME: kettenis/20030419: Perhaps, we can unify the 32-bit and
980 64-bit variants. This would require using identical frame caches
981 on both platforms. */
983 static struct amd64_frame_cache *
984 amd64_sigtramp_frame_cache (struct frame_info *next_frame, void **this_cache)
986 struct amd64_frame_cache *cache;
987 struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
995 cache = amd64_alloc_frame_cache ();
997 frame_unwind_register (next_frame, AMD64_RSP_REGNUM, buf);
998 cache->base = extract_unsigned_integer (buf, 8) - 8;
1000 addr = tdep->sigcontext_addr (next_frame);
1001 gdb_assert (tdep->sc_reg_offset);
1002 gdb_assert (tdep->sc_num_regs <= AMD64_NUM_SAVED_REGS);
1003 for (i = 0; i < tdep->sc_num_regs; i++)
1004 if (tdep->sc_reg_offset[i] != -1)
1005 cache->saved_regs[i] = addr + tdep->sc_reg_offset[i];
1007 *this_cache = cache;
1012 amd64_sigtramp_frame_this_id (struct frame_info *next_frame,
1013 void **this_cache, struct frame_id *this_id)
1015 struct amd64_frame_cache *cache =
1016 amd64_sigtramp_frame_cache (next_frame, this_cache);
1018 (*this_id) = frame_id_build (cache->base + 16, frame_pc_unwind (next_frame));
1022 amd64_sigtramp_frame_prev_register (struct frame_info *next_frame,
1024 int regnum, int *optimizedp,
1025 enum lval_type *lvalp, CORE_ADDR *addrp,
1026 int *realnump, gdb_byte *valuep)
1028 /* Make sure we've initialized the cache. */
1029 amd64_sigtramp_frame_cache (next_frame, this_cache);
1031 amd64_frame_prev_register (next_frame, this_cache, regnum,
1032 optimizedp, lvalp, addrp, realnump, valuep);
1035 static const struct frame_unwind amd64_sigtramp_frame_unwind =
1038 amd64_sigtramp_frame_this_id,
1039 amd64_sigtramp_frame_prev_register
1042 static const struct frame_unwind *
1043 amd64_sigtramp_frame_sniffer (struct frame_info *next_frame)
1045 struct gdbarch_tdep *tdep = gdbarch_tdep (get_frame_arch (next_frame));
1047 /* We shouldn't even bother if we don't have a sigcontext_addr
1049 if (tdep->sigcontext_addr == NULL)
1052 if (tdep->sigtramp_p != NULL)
1054 if (tdep->sigtramp_p (next_frame))
1055 return &amd64_sigtramp_frame_unwind;
1058 if (tdep->sigtramp_start != 0)
1060 CORE_ADDR pc = frame_pc_unwind (next_frame);
1062 gdb_assert (tdep->sigtramp_end != 0);
1063 if (pc >= tdep->sigtramp_start && pc < tdep->sigtramp_end)
1064 return &amd64_sigtramp_frame_unwind;
1072 amd64_frame_base_address (struct frame_info *next_frame, void **this_cache)
1074 struct amd64_frame_cache *cache =
1075 amd64_frame_cache (next_frame, this_cache);
1080 static const struct frame_base amd64_frame_base =
1082 &amd64_frame_unwind,
1083 amd64_frame_base_address,
1084 amd64_frame_base_address,
1085 amd64_frame_base_address
1088 static struct frame_id
1089 amd64_unwind_dummy_id (struct gdbarch *gdbarch, struct frame_info *next_frame)
1094 frame_unwind_register (next_frame, AMD64_RBP_REGNUM, buf);
1095 fp = extract_unsigned_integer (buf, 8);
1097 return frame_id_build (fp + 16, frame_pc_unwind (next_frame));
1100 /* 16 byte align the SP per frame requirements. */
1103 amd64_frame_align (struct gdbarch *gdbarch, CORE_ADDR sp)
1105 return sp & -(CORE_ADDR)16;
1109 /* Supply register REGNUM from the buffer specified by FPREGS and LEN
1110 in the floating-point register set REGSET to register cache
1111 REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
1114 amd64_supply_fpregset (const struct regset *regset, struct regcache *regcache,
1115 int regnum, const void *fpregs, size_t len)
1117 const struct gdbarch_tdep *tdep = gdbarch_tdep (regset->arch);
1119 gdb_assert (len == tdep->sizeof_fpregset);
1120 amd64_supply_fxsave (regcache, regnum, fpregs);
1123 /* Collect register REGNUM from the register cache REGCACHE and store
1124 it in the buffer specified by FPREGS and LEN as described by the
1125 floating-point register set REGSET. If REGNUM is -1, do this for
1126 all registers in REGSET. */
1129 amd64_collect_fpregset (const struct regset *regset,
1130 const struct regcache *regcache,
1131 int regnum, void *fpregs, size_t len)
1133 const struct gdbarch_tdep *tdep = gdbarch_tdep (regset->arch);
1135 gdb_assert (len == tdep->sizeof_fpregset);
1136 amd64_collect_fxsave (regcache, regnum, fpregs);
1139 /* Return the appropriate register set for the core section identified
1140 by SECT_NAME and SECT_SIZE. */
1142 static const struct regset *
1143 amd64_regset_from_core_section (struct gdbarch *gdbarch,
1144 const char *sect_name, size_t sect_size)
1146 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
1148 if (strcmp (sect_name, ".reg2") == 0 && sect_size == tdep->sizeof_fpregset)
1150 if (tdep->fpregset == NULL)
1151 tdep->fpregset = regset_alloc (gdbarch, amd64_supply_fpregset,
1152 amd64_collect_fpregset);
1154 return tdep->fpregset;
1157 return i386_regset_from_core_section (gdbarch, sect_name, sect_size);
1162 amd64_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
1164 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
1166 /* AMD64 generally uses `fxsave' instead of `fsave' for saving its
1167 floating-point registers. */
1168 tdep->sizeof_fpregset = I387_SIZEOF_FXSAVE;
1170 /* AMD64 has an FPU and 16 SSE registers. */
1171 tdep->st0_regnum = AMD64_ST0_REGNUM;
1172 tdep->num_xmm_regs = 16;
1174 /* This is what all the fuss is about. */
1175 set_gdbarch_long_bit (gdbarch, 64);
1176 set_gdbarch_long_long_bit (gdbarch, 64);
1177 set_gdbarch_ptr_bit (gdbarch, 64);
1179 /* In contrast to the i386, on AMD64 a `long double' actually takes
1180 up 128 bits, even though it's still based on the i387 extended
1181 floating-point format which has only 80 significant bits. */
1182 set_gdbarch_long_double_bit (gdbarch, 128);
1184 set_gdbarch_num_regs (gdbarch, AMD64_NUM_REGS);
1185 set_gdbarch_register_name (gdbarch, amd64_register_name);
1186 set_gdbarch_register_type (gdbarch, amd64_register_type);
1188 /* Register numbers of various important registers. */
1189 set_gdbarch_sp_regnum (gdbarch, AMD64_RSP_REGNUM); /* %rsp */
1190 set_gdbarch_pc_regnum (gdbarch, AMD64_RIP_REGNUM); /* %rip */
1191 set_gdbarch_ps_regnum (gdbarch, AMD64_EFLAGS_REGNUM); /* %eflags */
1192 set_gdbarch_fp0_regnum (gdbarch, AMD64_ST0_REGNUM); /* %st(0) */
1194 /* The "default" register numbering scheme for AMD64 is referred to
1195 as the "DWARF Register Number Mapping" in the System V psABI.
1196 The preferred debugging format for all known AMD64 targets is
1197 actually DWARF2, and GCC doesn't seem to support DWARF (that is
1198 DWARF-1), but we provide the same mapping just in case. This
1199 mapping is also used for stabs, which GCC does support. */
1200 set_gdbarch_stab_reg_to_regnum (gdbarch, amd64_dwarf_reg_to_regnum);
1201 set_gdbarch_dwarf_reg_to_regnum (gdbarch, amd64_dwarf_reg_to_regnum);
1202 set_gdbarch_dwarf2_reg_to_regnum (gdbarch, amd64_dwarf_reg_to_regnum);
1204 /* We don't override SDB_REG_RO_REGNUM, since COFF doesn't seem to
1205 be in use on any of the supported AMD64 targets. */
1207 /* Call dummy code. */
1208 set_gdbarch_push_dummy_call (gdbarch, amd64_push_dummy_call);
1209 set_gdbarch_frame_align (gdbarch, amd64_frame_align);
1210 set_gdbarch_frame_red_zone_size (gdbarch, 128);
1212 set_gdbarch_convert_register_p (gdbarch, amd64_convert_register_p);
1213 set_gdbarch_register_to_value (gdbarch, i387_register_to_value);
1214 set_gdbarch_value_to_register (gdbarch, i387_value_to_register);
1216 set_gdbarch_return_value (gdbarch, amd64_return_value);
1218 set_gdbarch_skip_prologue (gdbarch, amd64_skip_prologue);
1220 /* Avoid wiring in the MMX registers for now. */
1221 set_gdbarch_num_pseudo_regs (gdbarch, 0);
1222 tdep->mm0_regnum = -1;
1224 set_gdbarch_unwind_dummy_id (gdbarch, amd64_unwind_dummy_id);
1226 frame_unwind_append_sniffer (gdbarch, amd64_sigtramp_frame_sniffer);
1227 frame_unwind_append_sniffer (gdbarch, amd64_frame_sniffer);
1228 frame_base_set_default (gdbarch, &amd64_frame_base);
1230 /* If we have a register mapping, enable the generic core file support. */
1231 if (tdep->gregset_reg_offset)
1232 set_gdbarch_regset_from_core_section (gdbarch,
1233 amd64_regset_from_core_section);
1237 #define I387_ST0_REGNUM AMD64_ST0_REGNUM
1239 /* The 64-bit FXSAVE format differs from the 32-bit format in the
1240 sense that the instruction pointer and data pointer are simply
1241 64-bit offsets into the code segment and the data segment instead
1242 of a selector offset pair. The functions below store the upper 32
1243 bits of these pointers (instead of just the 16-bits of the segment
1246 /* Fill register REGNUM in REGCACHE with the appropriate
1247 floating-point or SSE register value from *FXSAVE. If REGNUM is
1248 -1, do this for all registers. This function masks off any of the
1249 reserved bits in *FXSAVE. */
1252 amd64_supply_fxsave (struct regcache *regcache, int regnum,
1255 i387_supply_fxsave (regcache, regnum, fxsave);
1257 if (fxsave && gdbarch_ptr_bit (get_regcache_arch (regcache)) == 64)
1259 const gdb_byte *regs = fxsave;
1261 if (regnum == -1 || regnum == I387_FISEG_REGNUM)
1262 regcache_raw_supply (regcache, I387_FISEG_REGNUM, regs + 12);
1263 if (regnum == -1 || regnum == I387_FOSEG_REGNUM)
1264 regcache_raw_supply (regcache, I387_FOSEG_REGNUM, regs + 20);
1268 /* Fill register REGNUM (if it is a floating-point or SSE register) in
1269 *FXSAVE with the value from REGCACHE. If REGNUM is -1, do this for
1270 all registers. This function doesn't touch any of the reserved
1274 amd64_collect_fxsave (const struct regcache *regcache, int regnum,
1277 gdb_byte *regs = fxsave;
1279 i387_collect_fxsave (regcache, regnum, fxsave);
1281 if (gdbarch_ptr_bit (get_regcache_arch (regcache)) == 64)
1283 if (regnum == -1 || regnum == I387_FISEG_REGNUM)
1284 regcache_raw_collect (regcache, I387_FISEG_REGNUM, regs + 12);
1285 if (regnum == -1 || regnum == I387_FOSEG_REGNUM)
1286 regcache_raw_collect (regcache, I387_FOSEG_REGNUM, regs + 20);