1048 lines
32 KiB
C
1048 lines
32 KiB
C
/* Target-dependent code for the x86-64 for GDB, the GNU debugger.
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Copyright 2001, 2002, 2003 Free Software Foundation, Inc.
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Contributed by Jiri Smid, SuSE Labs.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "inferior.h"
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#include "gdbcore.h"
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#include "gdbcmd.h"
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#include "arch-utils.h"
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#include "regcache.h"
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#include "symfile.h"
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#include "objfiles.h"
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#include "x86-64-tdep.h"
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#include "dwarf2cfi.h"
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#include "gdb_assert.h"
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/* Register numbers of various important registers. */
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#define RAX_REGNUM 0
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#define RDX_REGNUM 3
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#define RDI_REGNUM 5
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#define EFLAGS_REGNUM 17
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#define ST0_REGNUM 22
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#define XMM1_REGNUM 39
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struct register_info
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{
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int size;
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char *name;
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struct type **type;
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};
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/* x86_64_register_raw_size_table[i] is the number of bytes of storage in
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GDB's register array occupied by register i. */
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static struct register_info x86_64_register_info_table[] = {
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/* 0 */ {8, "rax", &builtin_type_int64},
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/* 1 */ {8, "rbx", &builtin_type_int64},
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/* 2 */ {8, "rcx", &builtin_type_int64},
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/* 3 */ {8, "rdx", &builtin_type_int64},
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/* 4 */ {8, "rsi", &builtin_type_int64},
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/* 5 */ {8, "rdi", &builtin_type_int64},
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/* 6 */ {8, "rbp", &builtin_type_void_func_ptr},
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/* 7 */ {8, "rsp", &builtin_type_void_func_ptr},
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/* 8 */ {8, "r8", &builtin_type_int64},
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/* 9 */ {8, "r9", &builtin_type_int64},
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/* 10 */ {8, "r10", &builtin_type_int64},
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/* 11 */ {8, "r11", &builtin_type_int64},
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/* 12 */ {8, "r12", &builtin_type_int64},
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/* 13 */ {8, "r13", &builtin_type_int64},
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/* 14 */ {8, "r14", &builtin_type_int64},
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/* 15 */ {8, "r15", &builtin_type_int64},
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/* 16 */ {8, "rip", &builtin_type_void_func_ptr},
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/* 17 */ {4, "eflags", &builtin_type_int32},
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/* 18 */ {4, "ds", &builtin_type_int32},
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/* 19 */ {4, "es", &builtin_type_int32},
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/* 20 */ {4, "fs", &builtin_type_int32},
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/* 21 */ {4, "gs", &builtin_type_int32},
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/* 22 */ {10, "st0", &builtin_type_i387_ext},
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/* 23 */ {10, "st1", &builtin_type_i387_ext},
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/* 24 */ {10, "st2", &builtin_type_i387_ext},
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/* 25 */ {10, "st3", &builtin_type_i387_ext},
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/* 26 */ {10, "st4", &builtin_type_i387_ext},
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/* 27 */ {10, "st5", &builtin_type_i387_ext},
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/* 28 */ {10, "st6", &builtin_type_i387_ext},
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/* 29 */ {10, "st7", &builtin_type_i387_ext},
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/* 30 */ {4, "fctrl", &builtin_type_int32},
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/* 31 */ {4, "fstat", &builtin_type_int32},
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/* 32 */ {4, "ftag", &builtin_type_int32},
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/* 33 */ {4, "fiseg", &builtin_type_int32},
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/* 34 */ {4, "fioff", &builtin_type_int32},
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/* 35 */ {4, "foseg", &builtin_type_int32},
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/* 36 */ {4, "fooff", &builtin_type_int32},
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/* 37 */ {4, "fop", &builtin_type_int32},
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/* 38 */ {16, "xmm0", &builtin_type_v4sf},
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/* 39 */ {16, "xmm1", &builtin_type_v4sf},
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/* 40 */ {16, "xmm2", &builtin_type_v4sf},
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/* 41 */ {16, "xmm3", &builtin_type_v4sf},
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/* 42 */ {16, "xmm4", &builtin_type_v4sf},
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/* 43 */ {16, "xmm5", &builtin_type_v4sf},
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/* 44 */ {16, "xmm6", &builtin_type_v4sf},
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/* 45 */ {16, "xmm7", &builtin_type_v4sf},
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/* 46 */ {16, "xmm8", &builtin_type_v4sf},
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/* 47 */ {16, "xmm9", &builtin_type_v4sf},
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/* 48 */ {16, "xmm10", &builtin_type_v4sf},
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/* 49 */ {16, "xmm11", &builtin_type_v4sf},
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/* 50 */ {16, "xmm12", &builtin_type_v4sf},
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/* 51 */ {16, "xmm13", &builtin_type_v4sf},
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/* 52 */ {16, "xmm14", &builtin_type_v4sf},
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/* 53 */ {16, "xmm15", &builtin_type_v4sf},
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/* 54 */ {4, "mxcsr", &builtin_type_int32}
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};
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/* This array is a mapping from Dwarf-2 register
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numbering to GDB's one. Dwarf-2 numbering is
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defined in x86-64 ABI, section 3.6. */
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static int x86_64_dwarf2gdb_regno_map[] = {
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0, 1, 2, 3, /* RAX - RDX */
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4, 5, 6, 7, /* RSI, RDI, RBP, RSP */
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8, 9, 10, 11, /* R8 - R11 */
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12, 13, 14, 15, /* R12 - R15 */
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-1, /* RA - not mapped */
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XMM1_REGNUM - 1, XMM1_REGNUM, /* XMM0 ... */
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XMM1_REGNUM + 1, XMM1_REGNUM + 2,
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XMM1_REGNUM + 3, XMM1_REGNUM + 4,
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XMM1_REGNUM + 5, XMM1_REGNUM + 6,
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XMM1_REGNUM + 7, XMM1_REGNUM + 8,
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XMM1_REGNUM + 9, XMM1_REGNUM + 10,
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XMM1_REGNUM + 11, XMM1_REGNUM + 12,
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XMM1_REGNUM + 13, XMM1_REGNUM + 14, /* ... XMM15 */
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ST0_REGNUM + 0, ST0_REGNUM + 1, /* ST0 ... */
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ST0_REGNUM + 2, ST0_REGNUM + 3,
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ST0_REGNUM + 4, ST0_REGNUM + 5,
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ST0_REGNUM + 6, ST0_REGNUM + 7 /* ... ST7 */
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};
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static int x86_64_dwarf2gdb_regno_map_length =
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sizeof (x86_64_dwarf2gdb_regno_map) /
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sizeof (x86_64_dwarf2gdb_regno_map[0]);
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/* Number of all registers */
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#define X86_64_NUM_REGS (sizeof (x86_64_register_info_table) / \
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sizeof (x86_64_register_info_table[0]))
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/* Number of general registers. */
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#define X86_64_NUM_GREGS (22)
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int x86_64_num_regs = X86_64_NUM_REGS;
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int x86_64_num_gregs = X86_64_NUM_GREGS;
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/* Did we already print a note about frame pointer? */
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int omit_fp_note_printed = 0;
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/* Number of bytes of storage in the actual machine representation for
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register REGNO. */
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int
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x86_64_register_raw_size (int regno)
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{
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return x86_64_register_info_table[regno].size;
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}
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/* x86_64_register_byte_table[i] is the offset into the register file of the
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start of register number i. We initialize this from
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x86_64_register_info_table. */
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int x86_64_register_byte_table[X86_64_NUM_REGS];
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/* Index within `registers' of the first byte of the space for register REGNO. */
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int
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x86_64_register_byte (int regno)
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{
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return x86_64_register_byte_table[regno];
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}
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/* Return the GDB type object for the "standard" data type of data in
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register N. */
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static struct type *
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x86_64_register_virtual_type (int regno)
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{
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return *x86_64_register_info_table[regno].type;
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}
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/* x86_64_register_convertible is true if register N's virtual format is
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different from its raw format. Note that this definition assumes
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that the host supports IEEE 32-bit floats, since it doesn't say
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that SSE registers need conversion. Even if we can't find a
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counterexample, this is still sloppy. */
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int
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x86_64_register_convertible (int regno)
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{
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return IS_FP_REGNUM (regno);
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}
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/* Convert data from raw format for register REGNUM in buffer FROM to
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virtual format with type TYPE in buffer TO. In principle both
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formats are identical except that the virtual format has two extra
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bytes appended that aren't used. We set these to zero. */
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void
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x86_64_register_convert_to_virtual (int regnum, struct type *type,
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char *from, char *to)
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{
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char buf[12];
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/* We only support floating-point values. */
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if (TYPE_CODE (type) != TYPE_CODE_FLT)
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{
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warning ("Cannot convert floating-point register value "
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"to non-floating-point type.");
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memset (to, 0, TYPE_LENGTH (type));
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return;
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}
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/* First add the necessary padding. */
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memcpy (buf, from, FPU_REG_RAW_SIZE);
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memset (buf + FPU_REG_RAW_SIZE, 0, sizeof buf - FPU_REG_RAW_SIZE);
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/* Convert to TYPE. This should be a no-op, if TYPE is equivalent
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to the extended floating-point format used by the FPU. */
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convert_typed_floating (to, type, buf,
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x86_64_register_virtual_type (regnum));
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}
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/* Convert data from virtual format with type TYPE in buffer FROM to
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raw format for register REGNUM in buffer TO. Simply omit the two
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unused bytes. */
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void
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x86_64_register_convert_to_raw (struct type *type, int regnum,
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char *from, char *to)
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{
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gdb_assert (TYPE_CODE (type) == TYPE_CODE_FLT && TYPE_LENGTH (type) == 12);
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/* Simply omit the two unused bytes. */
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memcpy (to, from, FPU_REG_RAW_SIZE);
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}
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/* Dwarf-2 <-> GDB register numbers mapping. */
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int
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x86_64_dwarf2_reg_to_regnum (int dw_reg)
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{
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if (dw_reg < 0 || dw_reg > x86_64_dwarf2gdb_regno_map_length)
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{
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warning ("Dwarf-2 uses unmapped register #%d\n", dw_reg);
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return dw_reg;
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}
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return x86_64_dwarf2gdb_regno_map[dw_reg];
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}
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/* This is the variable that is set with "set disassembly-flavour", and
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its legitimate values. */
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static const char att_flavour[] = "att";
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static const char intel_flavour[] = "intel";
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static const char *valid_flavours[] = {
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att_flavour,
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intel_flavour,
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NULL
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};
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static const char *disassembly_flavour = att_flavour;
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/* Push the return address (pointing to the call dummy) onto the stack
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and return the new value for the stack pointer. */
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static CORE_ADDR
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x86_64_push_return_address (CORE_ADDR pc, CORE_ADDR sp)
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{
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char buf[8];
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store_unsigned_integer (buf, 8, CALL_DUMMY_ADDRESS ());
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write_memory (sp - 8, buf, 8);
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return sp - 8;
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}
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static void
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x86_64_pop_frame (void)
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{
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generic_pop_current_frame (cfi_pop_frame);
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}
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/* The returning of values is done according to the special algorithm.
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Some types are returned in registers an some (big structures) in memory.
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See ABI for details.
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*/
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#define MAX_CLASSES 4
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enum x86_64_reg_class
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{
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X86_64_NO_CLASS,
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X86_64_INTEGER_CLASS,
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X86_64_INTEGERSI_CLASS,
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X86_64_SSE_CLASS,
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X86_64_SSESF_CLASS,
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X86_64_SSEDF_CLASS,
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X86_64_SSEUP_CLASS,
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X86_64_X87_CLASS,
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X86_64_X87UP_CLASS,
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X86_64_MEMORY_CLASS
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};
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/* Return the union class of CLASS1 and CLASS2.
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See the x86-64 ABI for details. */
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static enum x86_64_reg_class
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merge_classes (enum x86_64_reg_class class1, enum x86_64_reg_class class2)
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{
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/* Rule #1: If both classes are equal, this is the resulting class. */
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if (class1 == class2)
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return class1;
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/* Rule #2: If one of the classes is NO_CLASS, the resulting class
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is the other class. */
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if (class1 == X86_64_NO_CLASS)
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return class2;
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if (class2 == X86_64_NO_CLASS)
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return class1;
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/* Rule #3: If one of the classes is MEMORY, the result is MEMORY. */
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if (class1 == X86_64_MEMORY_CLASS || class2 == X86_64_MEMORY_CLASS)
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return X86_64_MEMORY_CLASS;
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/* Rule #4: If one of the classes is INTEGER, the result is INTEGER. */
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if ((class1 == X86_64_INTEGERSI_CLASS && class2 == X86_64_SSESF_CLASS)
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|| (class2 == X86_64_INTEGERSI_CLASS && class1 == X86_64_SSESF_CLASS))
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return X86_64_INTEGERSI_CLASS;
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if (class1 == X86_64_INTEGER_CLASS || class1 == X86_64_INTEGERSI_CLASS
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|| class2 == X86_64_INTEGER_CLASS || class2 == X86_64_INTEGERSI_CLASS)
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return X86_64_INTEGER_CLASS;
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/* Rule #5: If one of the classes is X87 or X87UP class, MEMORY is used. */
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if (class1 == X86_64_X87_CLASS || class1 == X86_64_X87UP_CLASS
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|| class2 == X86_64_X87_CLASS || class2 == X86_64_X87UP_CLASS)
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return X86_64_MEMORY_CLASS;
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/* Rule #6: Otherwise class SSE is used. */
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return X86_64_SSE_CLASS;
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}
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/* Classify the argument type. CLASSES will be filled by the register
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class used to pass each word of the operand. The number of words
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is returned. In case the parameter should be passed in memory, 0
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is returned. As a special case for zero sized containers,
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classes[0] will be NO_CLASS and 1 is returned.
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See the x86-64 psABI for details. */
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static int
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classify_argument (struct type *type,
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enum x86_64_reg_class classes[MAX_CLASSES], int bit_offset)
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{
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int bytes = TYPE_LENGTH (type);
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int words = (bytes + 8 - 1) / 8;
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switch (TYPE_CODE (type))
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{
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case TYPE_CODE_ARRAY:
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case TYPE_CODE_STRUCT:
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case TYPE_CODE_UNION:
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{
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int i;
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enum x86_64_reg_class subclasses[MAX_CLASSES];
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/* On x86-64 we pass structures larger than 16 bytes on the stack. */
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if (bytes > 16)
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return 0;
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for (i = 0; i < words; i++)
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classes[i] = X86_64_NO_CLASS;
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/* Zero sized arrays or structures are NO_CLASS. We return 0
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to signalize memory class, so handle it as special case. */
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if (!words)
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{
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classes[0] = X86_64_NO_CLASS;
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return 1;
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}
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switch (TYPE_CODE (type))
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{
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case TYPE_CODE_STRUCT:
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{
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int j;
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for (j = 0; j < TYPE_NFIELDS (type); ++j)
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{
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int num = classify_argument (TYPE_FIELDS (type)[j].type,
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subclasses,
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(TYPE_FIELDS (type)[j].loc.
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bitpos + bit_offset) % 256);
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if (!num)
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return 0;
|
||
for (i = 0; i < num; i++)
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||
{
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||
int pos =
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(TYPE_FIELDS (type)[j].loc.bitpos +
|
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bit_offset) / 8 / 8;
|
||
classes[i + pos] =
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merge_classes (subclasses[i], classes[i + pos]);
|
||
}
|
||
}
|
||
}
|
||
break;
|
||
case TYPE_CODE_ARRAY:
|
||
{
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||
int num;
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||
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num = classify_argument (TYPE_TARGET_TYPE (type),
|
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subclasses, bit_offset);
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if (!num)
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return 0;
|
||
|
||
/* The partial classes are now full classes. */
|
||
if (subclasses[0] == X86_64_SSESF_CLASS && bytes != 4)
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subclasses[0] = X86_64_SSE_CLASS;
|
||
if (subclasses[0] == X86_64_INTEGERSI_CLASS && bytes != 4)
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||
subclasses[0] = X86_64_INTEGER_CLASS;
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||
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||
for (i = 0; i < words; i++)
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classes[i] = subclasses[i % num];
|
||
}
|
||
break;
|
||
case TYPE_CODE_UNION:
|
||
{
|
||
int j;
|
||
{
|
||
for (j = 0; j < TYPE_NFIELDS (type); ++j)
|
||
{
|
||
int num;
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||
num = classify_argument (TYPE_FIELDS (type)[j].type,
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subclasses, bit_offset);
|
||
if (!num)
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return 0;
|
||
for (i = 0; i < num; i++)
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||
classes[i] = merge_classes (subclasses[i], classes[i]);
|
||
}
|
||
}
|
||
}
|
||
break;
|
||
default:
|
||
break;
|
||
}
|
||
/* Final merger cleanup. */
|
||
for (i = 0; i < words; i++)
|
||
{
|
||
/* If one class is MEMORY, everything should be passed in
|
||
memory. */
|
||
if (classes[i] == X86_64_MEMORY_CLASS)
|
||
return 0;
|
||
|
||
/* The X86_64_SSEUP_CLASS should be always preceeded by
|
||
X86_64_SSE_CLASS. */
|
||
if (classes[i] == X86_64_SSEUP_CLASS
|
||
&& (i == 0 || classes[i - 1] != X86_64_SSE_CLASS))
|
||
classes[i] = X86_64_SSE_CLASS;
|
||
|
||
/* X86_64_X87UP_CLASS should be preceeded by X86_64_X87_CLASS. */
|
||
if (classes[i] == X86_64_X87UP_CLASS
|
||
&& (i == 0 || classes[i - 1] != X86_64_X87_CLASS))
|
||
classes[i] = X86_64_SSE_CLASS;
|
||
}
|
||
return words;
|
||
}
|
||
break;
|
||
case TYPE_CODE_FLT:
|
||
switch (bytes)
|
||
{
|
||
case 4:
|
||
if (!(bit_offset % 64))
|
||
classes[0] = X86_64_SSESF_CLASS;
|
||
else
|
||
classes[0] = X86_64_SSE_CLASS;
|
||
return 1;
|
||
case 8:
|
||
classes[0] = X86_64_SSEDF_CLASS;
|
||
return 1;
|
||
case 16:
|
||
classes[0] = X86_64_X87_CLASS;
|
||
classes[1] = X86_64_X87UP_CLASS;
|
||
return 2;
|
||
}
|
||
break;
|
||
case TYPE_CODE_INT:
|
||
case TYPE_CODE_PTR:
|
||
switch (bytes)
|
||
{
|
||
case 1:
|
||
case 2:
|
||
case 4:
|
||
case 8:
|
||
if (bytes * 8 + bit_offset <= 32)
|
||
classes[0] = X86_64_INTEGERSI_CLASS;
|
||
else
|
||
classes[0] = X86_64_INTEGER_CLASS;
|
||
return 1;
|
||
case 16:
|
||
classes[0] = classes[1] = X86_64_INTEGER_CLASS;
|
||
return 2;
|
||
default:
|
||
break;
|
||
}
|
||
case TYPE_CODE_VOID:
|
||
return 0;
|
||
default: /* Avoid warning. */
|
||
break;
|
||
}
|
||
internal_error (__FILE__, __LINE__,
|
||
"classify_argument: unknown argument type");
|
||
}
|
||
|
||
/* Examine the argument and set *INT_NREGS and *SSE_NREGS to the
|
||
number of registers required based on the information passed in
|
||
CLASSES. Return 0 if parameter should be passed in memory. */
|
||
|
||
static int
|
||
examine_argument (enum x86_64_reg_class classes[MAX_CLASSES],
|
||
int n, int *int_nregs, int *sse_nregs)
|
||
{
|
||
*int_nregs = 0;
|
||
*sse_nregs = 0;
|
||
if (!n)
|
||
return 0;
|
||
for (n--; n >= 0; n--)
|
||
switch (classes[n])
|
||
{
|
||
case X86_64_INTEGER_CLASS:
|
||
case X86_64_INTEGERSI_CLASS:
|
||
(*int_nregs)++;
|
||
break;
|
||
case X86_64_SSE_CLASS:
|
||
case X86_64_SSESF_CLASS:
|
||
case X86_64_SSEDF_CLASS:
|
||
(*sse_nregs)++;
|
||
break;
|
||
case X86_64_NO_CLASS:
|
||
case X86_64_SSEUP_CLASS:
|
||
case X86_64_X87_CLASS:
|
||
case X86_64_X87UP_CLASS:
|
||
break;
|
||
case X86_64_MEMORY_CLASS:
|
||
internal_error (__FILE__, __LINE__,
|
||
"examine_argument: unexpected memory class");
|
||
}
|
||
return 1;
|
||
}
|
||
|
||
#define RET_INT_REGS 2
|
||
#define RET_SSE_REGS 2
|
||
|
||
/* Check if the structure in value_type is returned in registers or in
|
||
memory. If this function returns 1, GDB will call
|
||
STORE_STRUCT_RETURN and EXTRACT_STRUCT_VALUE_ADDRESS else
|
||
STORE_RETURN_VALUE and EXTRACT_RETURN_VALUE will be used. */
|
||
int
|
||
x86_64_use_struct_convention (int gcc_p, struct type *value_type)
|
||
{
|
||
enum x86_64_reg_class class[MAX_CLASSES];
|
||
int n = classify_argument (value_type, class, 0);
|
||
int needed_intregs;
|
||
int needed_sseregs;
|
||
|
||
return (!n ||
|
||
!examine_argument (class, n, &needed_intregs, &needed_sseregs) ||
|
||
needed_intregs > RET_INT_REGS || needed_sseregs > RET_SSE_REGS);
|
||
}
|
||
|
||
/* Extract from an array REGBUF containing the (raw) register state, a
|
||
function return value of TYPE, and copy that, in virtual format,
|
||
into VALBUF. */
|
||
|
||
void
|
||
x86_64_extract_return_value (struct type *type, char *regbuf, char *valbuf)
|
||
{
|
||
enum x86_64_reg_class class[MAX_CLASSES];
|
||
int n = classify_argument (type, class, 0);
|
||
int needed_intregs;
|
||
int needed_sseregs;
|
||
int intreg = 0;
|
||
int ssereg = 0;
|
||
int offset = 0;
|
||
int ret_int_r[RET_INT_REGS] = { RAX_REGNUM, RDX_REGNUM };
|
||
int ret_sse_r[RET_SSE_REGS] = { XMM0_REGNUM, XMM1_REGNUM };
|
||
|
||
if (!n ||
|
||
!examine_argument (class, n, &needed_intregs, &needed_sseregs) ||
|
||
needed_intregs > RET_INT_REGS || needed_sseregs > RET_SSE_REGS)
|
||
{ /* memory class */
|
||
CORE_ADDR addr;
|
||
memcpy (&addr, regbuf, REGISTER_RAW_SIZE (RAX_REGNUM));
|
||
read_memory (addr, valbuf, TYPE_LENGTH (type));
|
||
return;
|
||
}
|
||
else
|
||
{
|
||
int i;
|
||
for (i = 0; i < n; i++)
|
||
{
|
||
switch (class[i])
|
||
{
|
||
case X86_64_NO_CLASS:
|
||
break;
|
||
case X86_64_INTEGER_CLASS:
|
||
memcpy (valbuf + offset,
|
||
regbuf + REGISTER_BYTE (ret_int_r[(intreg + 1) / 2]),
|
||
8);
|
||
offset += 8;
|
||
intreg += 2;
|
||
break;
|
||
case X86_64_INTEGERSI_CLASS:
|
||
memcpy (valbuf + offset,
|
||
regbuf + REGISTER_BYTE (ret_int_r[intreg / 2]), 4);
|
||
offset += 8;
|
||
intreg++;
|
||
break;
|
||
case X86_64_SSEDF_CLASS:
|
||
case X86_64_SSESF_CLASS:
|
||
case X86_64_SSE_CLASS:
|
||
memcpy (valbuf + offset,
|
||
regbuf + REGISTER_BYTE (ret_sse_r[(ssereg + 1) / 2]),
|
||
8);
|
||
offset += 8;
|
||
ssereg += 2;
|
||
break;
|
||
case X86_64_SSEUP_CLASS:
|
||
memcpy (valbuf + offset + 8,
|
||
regbuf + REGISTER_BYTE (ret_sse_r[ssereg / 2]), 8);
|
||
offset += 8;
|
||
ssereg++;
|
||
break;
|
||
case X86_64_X87_CLASS:
|
||
memcpy (valbuf + offset, regbuf + REGISTER_BYTE (FP0_REGNUM),
|
||
8);
|
||
offset += 8;
|
||
break;
|
||
case X86_64_X87UP_CLASS:
|
||
memcpy (valbuf + offset,
|
||
regbuf + REGISTER_BYTE (FP0_REGNUM) + 8, 8);
|
||
offset += 8;
|
||
break;
|
||
case X86_64_MEMORY_CLASS:
|
||
default:
|
||
internal_error (__FILE__, __LINE__,
|
||
"Unexpected argument class");
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
static void
|
||
x86_64_frame_init_saved_regs (struct frame_info *fi)
|
||
{
|
||
/* Do nothing. Everything is handled by the stack unwinding code. */
|
||
}
|
||
|
||
#define INT_REGS 6
|
||
#define SSE_REGS 16
|
||
|
||
CORE_ADDR
|
||
x86_64_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
|
||
int struct_return, CORE_ADDR struct_addr)
|
||
{
|
||
int intreg = 0;
|
||
int ssereg = 0;
|
||
int i;
|
||
static int int_parameter_registers[INT_REGS] = {
|
||
5 /* RDI */ , 4 /* RSI */ ,
|
||
3 /* RDX */ , 2 /* RCX */ ,
|
||
8 /* R8 */ , 9 /* R9 */
|
||
};
|
||
/* XMM0 - XMM15 */
|
||
static int sse_parameter_registers[SSE_REGS] = {
|
||
XMM1_REGNUM - 1, XMM1_REGNUM, XMM1_REGNUM + 1, XMM1_REGNUM + 2,
|
||
XMM1_REGNUM + 3, XMM1_REGNUM + 4, XMM1_REGNUM + 5, XMM1_REGNUM + 6,
|
||
XMM1_REGNUM + 7, XMM1_REGNUM + 8, XMM1_REGNUM + 9, XMM1_REGNUM + 10,
|
||
XMM1_REGNUM + 11, XMM1_REGNUM + 12, XMM1_REGNUM + 13, XMM1_REGNUM + 14
|
||
};
|
||
int stack_values_count = 0;
|
||
int *stack_values;
|
||
stack_values = alloca (nargs * sizeof (int));
|
||
for (i = 0; i < nargs; i++)
|
||
{
|
||
enum x86_64_reg_class class[MAX_CLASSES];
|
||
int n = classify_argument (args[i]->type, class, 0);
|
||
int needed_intregs;
|
||
int needed_sseregs;
|
||
|
||
if (!n ||
|
||
!examine_argument (class, n, &needed_intregs, &needed_sseregs)
|
||
|| intreg / 2 + needed_intregs > INT_REGS
|
||
|| ssereg / 2 + needed_sseregs > SSE_REGS)
|
||
{ /* memory class */
|
||
stack_values[stack_values_count++] = i;
|
||
}
|
||
else
|
||
{
|
||
int j;
|
||
for (j = 0; j < n; j++)
|
||
{
|
||
int offset = 0;
|
||
switch (class[j])
|
||
{
|
||
case X86_64_NO_CLASS:
|
||
break;
|
||
case X86_64_INTEGER_CLASS:
|
||
deprecated_write_register_gen (int_parameter_registers
|
||
[(intreg + 1) / 2],
|
||
VALUE_CONTENTS_ALL (args[i]) + offset);
|
||
offset += 8;
|
||
intreg += 2;
|
||
break;
|
||
case X86_64_INTEGERSI_CLASS:
|
||
deprecated_write_register_gen (int_parameter_registers[intreg / 2],
|
||
VALUE_CONTENTS_ALL (args[i]) + offset);
|
||
offset += 8;
|
||
intreg++;
|
||
break;
|
||
case X86_64_SSEDF_CLASS:
|
||
case X86_64_SSESF_CLASS:
|
||
case X86_64_SSE_CLASS:
|
||
deprecated_write_register_gen (sse_parameter_registers
|
||
[(ssereg + 1) / 2],
|
||
VALUE_CONTENTS_ALL (args[i]) + offset);
|
||
offset += 8;
|
||
ssereg += 2;
|
||
break;
|
||
case X86_64_SSEUP_CLASS:
|
||
deprecated_write_register_gen (sse_parameter_registers[ssereg / 2],
|
||
VALUE_CONTENTS_ALL (args[i]) + offset);
|
||
offset += 8;
|
||
ssereg++;
|
||
break;
|
||
case X86_64_X87_CLASS:
|
||
case X86_64_MEMORY_CLASS:
|
||
stack_values[stack_values_count++] = i;
|
||
break;
|
||
case X86_64_X87UP_CLASS:
|
||
break;
|
||
default:
|
||
internal_error (__FILE__, __LINE__,
|
||
"Unexpected argument class");
|
||
}
|
||
intreg += intreg % 2;
|
||
ssereg += ssereg % 2;
|
||
}
|
||
}
|
||
}
|
||
while (--stack_values_count >= 0)
|
||
{
|
||
struct value *arg = args[stack_values[stack_values_count]];
|
||
int len = TYPE_LENGTH (VALUE_ENCLOSING_TYPE (arg));
|
||
len += 7;
|
||
len -= len % 8;
|
||
sp -= len;
|
||
write_memory (sp, VALUE_CONTENTS_ALL (arg), len);
|
||
}
|
||
return sp;
|
||
}
|
||
|
||
/* Write into the appropriate registers a function return value stored
|
||
in VALBUF of type TYPE, given in virtual format. */
|
||
void
|
||
x86_64_store_return_value (struct type *type, char *valbuf)
|
||
{
|
||
int len = TYPE_LENGTH (type);
|
||
|
||
if (TYPE_CODE_FLT == TYPE_CODE (type))
|
||
{
|
||
/* Floating-point return values can be found in %st(0). */
|
||
if (len == TARGET_LONG_DOUBLE_BIT / TARGET_CHAR_BIT
|
||
&& TARGET_LONG_DOUBLE_FORMAT == &floatformat_i387_ext)
|
||
{
|
||
/* Copy straight over. */
|
||
deprecated_write_register_bytes (REGISTER_BYTE (FP0_REGNUM), valbuf,
|
||
FPU_REG_RAW_SIZE);
|
||
}
|
||
else
|
||
{
|
||
char buf[FPU_REG_RAW_SIZE];
|
||
DOUBLEST val;
|
||
|
||
/* Convert the value found in VALBUF to the extended
|
||
floating point format used by the FPU. This is probably
|
||
not exactly how it would happen on the target itself, but
|
||
it is the best we can do. */
|
||
val = extract_floating (valbuf, TYPE_LENGTH (type));
|
||
floatformat_from_doublest (&floatformat_i387_ext, &val, buf);
|
||
deprecated_write_register_bytes (REGISTER_BYTE (FP0_REGNUM), buf,
|
||
FPU_REG_RAW_SIZE);
|
||
}
|
||
}
|
||
else
|
||
{
|
||
int low_size = REGISTER_RAW_SIZE (0);
|
||
int high_size = REGISTER_RAW_SIZE (1);
|
||
|
||
if (len <= low_size)
|
||
deprecated_write_register_bytes (REGISTER_BYTE (0), valbuf, len);
|
||
else if (len <= (low_size + high_size))
|
||
{
|
||
deprecated_write_register_bytes (REGISTER_BYTE (0), valbuf,
|
||
low_size);
|
||
deprecated_write_register_bytes (REGISTER_BYTE (1),
|
||
valbuf + low_size, len - low_size);
|
||
}
|
||
else
|
||
internal_error (__FILE__, __LINE__,
|
||
"Cannot store return value of %d bytes long.", len);
|
||
}
|
||
}
|
||
|
||
|
||
const char *
|
||
x86_64_register_name (int reg_nr)
|
||
{
|
||
if (reg_nr < 0 || reg_nr >= X86_64_NUM_REGS)
|
||
return NULL;
|
||
return x86_64_register_info_table[reg_nr].name;
|
||
}
|
||
|
||
int
|
||
x86_64_register_number (const char *name)
|
||
{
|
||
int reg_nr;
|
||
|
||
for (reg_nr = 0; reg_nr < X86_64_NUM_REGS; reg_nr++)
|
||
if (strcmp (name, x86_64_register_info_table[reg_nr].name) == 0)
|
||
return reg_nr;
|
||
return -1;
|
||
}
|
||
|
||
|
||
|
||
/* We have two flavours of disassembly. The machinery on this page
|
||
deals with switching between those. */
|
||
|
||
static int
|
||
gdb_print_insn_x86_64 (bfd_vma memaddr, disassemble_info * info)
|
||
{
|
||
if (disassembly_flavour == att_flavour)
|
||
return print_insn_i386_att (memaddr, info);
|
||
else if (disassembly_flavour == intel_flavour)
|
||
return print_insn_i386_intel (memaddr, info);
|
||
/* Never reached -- disassembly_flavour is always either att_flavour
|
||
or intel_flavour. */
|
||
internal_error (__FILE__, __LINE__, "failed internal consistency check");
|
||
}
|
||
|
||
|
||
/* Store the address of the place in which to copy the structure the
|
||
subroutine will return. This is called from call_function. */
|
||
void
|
||
x86_64_store_struct_return (CORE_ADDR addr, CORE_ADDR sp)
|
||
{
|
||
write_register (RDI_REGNUM, addr);
|
||
}
|
||
|
||
int
|
||
x86_64_frameless_function_invocation (struct frame_info *frame)
|
||
{
|
||
return 0;
|
||
}
|
||
|
||
/* If a function with debugging information and known beginning
|
||
is detected, we will return pc of the next line in the source
|
||
code. With this approach we effectively skip the prolog. */
|
||
|
||
#define PROLOG_BUFSIZE 4
|
||
CORE_ADDR
|
||
x86_64_skip_prologue (CORE_ADDR pc)
|
||
{
|
||
int i;
|
||
struct symtab_and_line v_sal;
|
||
struct symbol *v_function;
|
||
CORE_ADDR endaddr;
|
||
unsigned char prolog_buf[PROLOG_BUFSIZE];
|
||
|
||
/* We will handle only functions starting with: */
|
||
static unsigned char prolog_expect[PROLOG_BUFSIZE] =
|
||
{
|
||
0x55, /* pushq %rbp */
|
||
0x48, 0x89, 0xe5 /* movq %rsp, %rbp */
|
||
};
|
||
|
||
read_memory (pc, (char *) prolog_buf, PROLOG_BUFSIZE);
|
||
|
||
/* First check, whether pc points to pushq %rbp, movq %rsp, %rbp. */
|
||
for (i = 0; i < PROLOG_BUFSIZE; i++)
|
||
if (prolog_expect[i] != prolog_buf[i])
|
||
return pc; /* ... no, it doesn't. Nothing to skip. */
|
||
|
||
/* OK, we have found the prologue and want PC of the first
|
||
non-prologue instruction. */
|
||
pc += PROLOG_BUFSIZE;
|
||
|
||
v_function = find_pc_function (pc);
|
||
v_sal = find_pc_line (pc, 0);
|
||
|
||
/* If pc doesn't point to a function with debuginfo, some of the
|
||
following may be NULL. */
|
||
if (!v_function || !v_function->ginfo.value.block || !v_sal.symtab)
|
||
return pc;
|
||
|
||
endaddr = BLOCK_END (SYMBOL_BLOCK_VALUE (v_function));
|
||
|
||
for (i = 0; i < v_sal.symtab->linetable->nitems; i++)
|
||
if (v_sal.symtab->linetable->item[i].pc >= pc
|
||
&& v_sal.symtab->linetable->item[i].pc < endaddr)
|
||
{
|
||
pc = v_sal.symtab->linetable->item[i].pc;
|
||
break;
|
||
}
|
||
|
||
return pc;
|
||
}
|
||
|
||
/* Sequence of bytes for breakpoint instruction. */
|
||
static const unsigned char *
|
||
x86_64_breakpoint_from_pc (CORE_ADDR *pc, int *lenptr)
|
||
{
|
||
static unsigned char breakpoint[] = { 0xcc };
|
||
*lenptr = 1;
|
||
return breakpoint;
|
||
}
|
||
|
||
void
|
||
x86_64_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
|
||
{
|
||
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
||
int i, sum;
|
||
|
||
/* The x86-64 has 16 SSE registers. */
|
||
tdep->num_xmm_regs = 16;
|
||
|
||
/* This is what all the fuss is about. */
|
||
set_gdbarch_long_bit (gdbarch, 64);
|
||
set_gdbarch_long_long_bit (gdbarch, 64);
|
||
set_gdbarch_ptr_bit (gdbarch, 64);
|
||
|
||
/* In contrast to the i386, on the x86-64 a `long double' actually
|
||
takes up 128 bits, even though it's still based on the i387
|
||
extended floating-point format which has only 80 significant bits. */
|
||
set_gdbarch_long_double_bit (gdbarch, 128);
|
||
|
||
set_gdbarch_num_regs (gdbarch, X86_64_NUM_REGS);
|
||
|
||
/* Register numbers of various important registers. */
|
||
set_gdbarch_sp_regnum (gdbarch, 7); /* %rsp */
|
||
set_gdbarch_fp_regnum (gdbarch, 6); /* %rbp */
|
||
set_gdbarch_pc_regnum (gdbarch, 16); /* %rip */
|
||
set_gdbarch_ps_regnum (gdbarch, 17); /* %eflags */
|
||
set_gdbarch_fp0_regnum (gdbarch, X86_64_NUM_GREGS); /* %st(0) */
|
||
|
||
/* The "default" register numbering scheme for the x86-64 is
|
||
referred to as the "DWARF register number mapping" in the psABI.
|
||
The preferred debugging format for all known x86-64 targets is
|
||
actually DWARF2, and GCC doesn't seem to support DWARF (that is
|
||
DWARF-1), but we provide the same mapping just in case. This
|
||
mapping is also used for stabs, which GCC does support. */
|
||
set_gdbarch_stab_reg_to_regnum (gdbarch, x86_64_dwarf2_reg_to_regnum);
|
||
set_gdbarch_dwarf_reg_to_regnum (gdbarch, x86_64_dwarf2_reg_to_regnum);
|
||
set_gdbarch_dwarf2_reg_to_regnum (gdbarch, x86_64_dwarf2_reg_to_regnum);
|
||
|
||
/* We don't override SDB_REG_RO_REGNUM, sice COFF doesn't seem to be
|
||
in use on any of the supported x86-64 targets. */
|
||
|
||
set_gdbarch_register_name (gdbarch, x86_64_register_name);
|
||
set_gdbarch_register_size (gdbarch, 8);
|
||
|
||
/* Total amount of space needed to store our copies of the machine's
|
||
register (SIZEOF_GREGS + SIZEOF_FPU_REGS + SIZEOF_FPU_CTRL_REGS +
|
||
SIZEOF_SSE_REGS) */
|
||
for (i = 0, sum = 0; i < X86_64_NUM_REGS; i++)
|
||
sum += x86_64_register_info_table[i].size;
|
||
set_gdbarch_register_bytes (gdbarch, sum);
|
||
|
||
set_gdbarch_register_raw_size (gdbarch, x86_64_register_raw_size);
|
||
set_gdbarch_register_byte (gdbarch, x86_64_register_byte);
|
||
set_gdbarch_register_virtual_type (gdbarch, x86_64_register_virtual_type);
|
||
|
||
set_gdbarch_register_convertible (gdbarch, x86_64_register_convertible);
|
||
set_gdbarch_register_convert_to_virtual (gdbarch,
|
||
x86_64_register_convert_to_virtual);
|
||
set_gdbarch_register_convert_to_raw (gdbarch,
|
||
x86_64_register_convert_to_raw);
|
||
|
||
/* Getting saved registers is handled by unwind information. */
|
||
set_gdbarch_get_saved_register (gdbarch, cfi_get_saved_register);
|
||
|
||
/* FIXME: kettenis/20021026: Should we set parm_boundary to 64 here? */
|
||
set_gdbarch_read_fp (gdbarch, cfi_read_fp);
|
||
|
||
/* FIXME: kettenis/20021026: Should be undeprecated. */
|
||
set_gdbarch_extract_return_value (gdbarch, NULL);
|
||
set_gdbarch_deprecated_extract_return_value (gdbarch,
|
||
x86_64_extract_return_value);
|
||
set_gdbarch_push_arguments (gdbarch, x86_64_push_arguments);
|
||
set_gdbarch_push_return_address (gdbarch, x86_64_push_return_address);
|
||
set_gdbarch_pop_frame (gdbarch, x86_64_pop_frame);
|
||
set_gdbarch_store_struct_return (gdbarch, x86_64_store_struct_return);
|
||
/* FIXME: kettenis/20021026: Should be undeprecated. */
|
||
set_gdbarch_store_return_value (gdbarch, NULL);
|
||
set_gdbarch_deprecated_store_return_value (gdbarch,
|
||
x86_64_store_return_value);
|
||
/* Override, since this is handled by x86_64_extract_return_value. */
|
||
set_gdbarch_extract_struct_value_address (gdbarch, NULL);
|
||
set_gdbarch_use_struct_convention (gdbarch, x86_64_use_struct_convention);
|
||
|
||
set_gdbarch_frame_init_saved_regs (gdbarch, x86_64_frame_init_saved_regs);
|
||
set_gdbarch_skip_prologue (gdbarch, x86_64_skip_prologue);
|
||
|
||
set_gdbarch_frame_chain (gdbarch, x86_64_linux_frame_chain);
|
||
set_gdbarch_frameless_function_invocation (gdbarch,
|
||
x86_64_frameless_function_invocation);
|
||
/* FIXME: kettenis/20021026: These two are GNU/Linux-specific and
|
||
should be moved elsewhere. */
|
||
set_gdbarch_frame_saved_pc (gdbarch, x86_64_linux_frame_saved_pc);
|
||
set_gdbarch_saved_pc_after_call (gdbarch, x86_64_linux_saved_pc_after_call);
|
||
set_gdbarch_frame_num_args (gdbarch, frame_num_args_unknown);
|
||
/* FIXME: kettenis/20021026: This one is GNU/Linux-specific too. */
|
||
set_gdbarch_pc_in_sigtramp (gdbarch, x86_64_linux_in_sigtramp);
|
||
|
||
set_gdbarch_num_pseudo_regs (gdbarch, 0);
|
||
|
||
/* Build call frame information (CFI) from DWARF2 frame debug info. */
|
||
set_gdbarch_dwarf2_build_frame_info (gdbarch, dwarf2_build_frame_info);
|
||
|
||
/* Initialization of per-frame CFI. */
|
||
set_gdbarch_init_extra_frame_info (gdbarch, cfi_init_extra_frame_info);
|
||
|
||
/* Frame PC initialization is handled by using CFI. */
|
||
set_gdbarch_deprecated_init_frame_pc (gdbarch, x86_64_init_frame_pc);
|
||
|
||
/* Cons up virtual frame pointer for trace. */
|
||
set_gdbarch_virtual_frame_pointer (gdbarch, cfi_virtual_frame_pointer);
|
||
|
||
/* FIXME: kettenis/20021026: This is ELF-specific. Fine for now,
|
||
since all supported x86-64 targets are ELF, but that might change
|
||
in the future. */
|
||
set_gdbarch_in_solib_call_trampoline (gdbarch, in_plt_section);
|
||
}
|
||
|
||
void
|
||
_initialize_x86_64_tdep (void)
|
||
{
|
||
/* Initialize the table saying where each register starts in the
|
||
register file. */
|
||
{
|
||
int i, offset;
|
||
|
||
offset = 0;
|
||
for (i = 0; i < X86_64_NUM_REGS; i++)
|
||
{
|
||
x86_64_register_byte_table[i] = offset;
|
||
offset += x86_64_register_info_table[i].size;
|
||
}
|
||
}
|
||
}
|