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345bd07cce
I would like to be able to use non-trivial types in gdbarch_tdep types. This is not possible at the moment (in theory), because of the one definition rule. To allow it, rename all gdbarch_tdep types to <arch>_gdbarch_tdep, and make them inherit from a gdbarch_tdep base class. The inheritance is necessary to be able to pass pointers to all these <arch>_gdbarch_tdep objects to gdbarch_alloc, which takes a pointer to gdbarch_tdep. These objects are never deleted through a base class pointer, so I didn't include a virtual destructor. In the future, if gdbarch objects deletable, I could imagine that the gdbarch_tdep objects could become owned by the gdbarch objects, and then it would become useful to have a virtual destructor (so that the gdbarch object can delete the owned gdbarch_tdep object). But that's not necessary right now. It turns out that RISC-V already has a gdbarch_tdep that is non-default-constructible, so that provides a good motivation for this change. Most changes are fairly straightforward, mostly needing to add some casts all over the place. There is however the xtensa architecture, doing its own little weird thing to define its gdbarch_tdep. I did my best to adapt it, but I can't test those changes. Change-Id: Ic001903f91ddd106bd6ca09a79dabe8df2d69f3b
134 lines
3.7 KiB
C
134 lines
3.7 KiB
C
/* Target-dependent code for NetBSD/amd64.
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Copyright (C) 2003-2021 Free Software Foundation, Inc.
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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 3 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, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "arch-utils.h"
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#include "frame.h"
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#include "gdbcore.h"
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#include "osabi.h"
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#include "symtab.h"
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#include "amd64-tdep.h"
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#include "gdbsupport/x86-xstate.h"
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#include "netbsd-tdep.h"
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#include "solib-svr4.h"
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/* Support for signal handlers. */
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/* Return whether THIS_FRAME corresponds to a NetBSD sigtramp
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routine. */
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static int
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amd64nbsd_sigtramp_p (struct frame_info *this_frame)
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{
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CORE_ADDR pc = get_frame_pc (this_frame);
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const char *name;
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find_pc_partial_function (pc, &name, NULL, NULL);
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return nbsd_pc_in_sigtramp (pc, name);
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}
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/* Assuming THIS_FRAME corresponds to a NetBSD sigtramp routine,
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return the address of the associated mcontext structure. */
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static CORE_ADDR
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amd64nbsd_mcontext_addr (struct frame_info *this_frame)
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{
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CORE_ADDR addr;
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/* The register %r15 points at `struct ucontext' upon entry of a
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signal trampoline. */
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addr = get_frame_register_unsigned (this_frame, AMD64_R15_REGNUM);
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/* The mcontext structure lives as offset 56 in `struct ucontext'. */
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return addr + 56;
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}
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/* NetBSD 2.0 or later. */
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/* Mapping between the general-purpose registers in `struct reg'
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format and GDB's register cache layout. */
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/* From <machine/reg.h>. */
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int amd64nbsd_r_reg_offset[] =
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{
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14 * 8, /* %rax */
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13 * 8, /* %rbx */
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3 * 8, /* %rcx */
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2 * 8, /* %rdx */
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1 * 8, /* %rsi */
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0 * 8, /* %rdi */
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12 * 8, /* %rbp */
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24 * 8, /* %rsp */
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4 * 8, /* %r8 .. */
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5 * 8,
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6 * 8,
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7 * 8,
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8 * 8,
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9 * 8,
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10 * 8,
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11 * 8, /* ... %r15 */
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21 * 8, /* %rip */
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23 * 8, /* %eflags */
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22 * 8, /* %cs */
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25 * 8, /* %ss */
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18 * 8, /* %ds */
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17 * 8, /* %es */
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16 * 8, /* %fs */
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15 * 8 /* %gs */
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};
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static void
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amd64nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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i386_gdbarch_tdep *tdep = (i386_gdbarch_tdep *) gdbarch_tdep (gdbarch);
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/* Initialize general-purpose register set details first. */
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tdep->gregset_reg_offset = amd64nbsd_r_reg_offset;
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tdep->gregset_num_regs = ARRAY_SIZE (amd64nbsd_r_reg_offset);
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tdep->sizeof_gregset = 26 * 8;
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amd64_init_abi (info, gdbarch,
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amd64_target_description (X86_XSTATE_SSE_MASK, true));
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nbsd_init_abi (info, gdbarch);
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tdep->jb_pc_offset = 7 * 8;
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/* NetBSD has its own convention for signal trampolines. */
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tdep->sigtramp_p = amd64nbsd_sigtramp_p;
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tdep->sigcontext_addr = amd64nbsd_mcontext_addr;
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tdep->sc_reg_offset = amd64nbsd_r_reg_offset;
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tdep->sc_num_regs = ARRAY_SIZE (amd64nbsd_r_reg_offset);
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/* NetBSD uses SVR4-style shared libraries. */
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set_solib_svr4_fetch_link_map_offsets
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(gdbarch, svr4_lp64_fetch_link_map_offsets);
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}
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void _initialize_amd64nbsd_tdep ();
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void
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_initialize_amd64nbsd_tdep ()
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{
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/* The NetBSD/amd64 native dependent code makes this assumption. */
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gdb_assert (ARRAY_SIZE (amd64nbsd_r_reg_offset) == AMD64_NUM_GREGS);
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gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
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GDB_OSABI_NETBSD, amd64nbsd_init_abi);
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}
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