binutils-gdb/gdb/i386-netbsd-tdep.c
Simon Marchi 345bd07cce gdb: fix gdbarch_tdep ODR violation
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
2021-11-15 11:29:39 -05:00

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/* Target-dependent code for NetBSD/i386.
Copyright (C) 1988-2021 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "arch-utils.h"
#include "frame.h"
#include "gdbcore.h"
#include "regcache.h"
#include "regset.h"
#include "osabi.h"
#include "symtab.h"
#include "trad-frame.h"
#include "tramp-frame.h"
#include "i386-tdep.h"
#include "i387-tdep.h"
#include "netbsd-tdep.h"
#include "solib-svr4.h"
/* From <machine/reg.h>. */
static int i386nbsd_r_reg_offset[] =
{
0 * 4, /* %eax */
1 * 4, /* %ecx */
2 * 4, /* %edx */
3 * 4, /* %ebx */
4 * 4, /* %esp */
5 * 4, /* %ebp */
6 * 4, /* %esi */
7 * 4, /* %edi */
8 * 4, /* %eip */
9 * 4, /* %eflags */
10 * 4, /* %cs */
11 * 4, /* %ss */
12 * 4, /* %ds */
13 * 4, /* %es */
14 * 4, /* %fs */
15 * 4 /* %gs */
};
/* From <machine/signal.h>. */
static int i386nbsd_sc_reg_offset[] =
{
10 * 4, /* %eax */
9 * 4, /* %ecx */
8 * 4, /* %edx */
7 * 4, /* %ebx */
14 * 4, /* %esp */
6 * 4, /* %ebp */
5 * 4, /* %esi */
4 * 4, /* %edi */
11 * 4, /* %eip */
13 * 4, /* %eflags */
12 * 4, /* %cs */
15 * 4, /* %ss */
3 * 4, /* %ds */
2 * 4, /* %es */
1 * 4, /* %fs */
0 * 4 /* %gs */
};
/* From <machine/mcontext.h>. */
static int i386nbsd_mc_reg_offset[] =
{
11 * 4, /* %eax */
10 * 4, /* %ecx */
9 * 4, /* %edx */
8 * 4, /* %ebx */
7 * 4, /* %esp */
6 * 4, /* %ebp */
5 * 4, /* %esi */
4 * 4, /* %edi */
14 * 4, /* %eip */
16 * 4, /* %eflags */
15 * 4, /* %cs */
18 * 4, /* %ss */
3 * 4, /* %ds */
2 * 4, /* %es */
1 * 4, /* %fs */
0 * 4 /* %gs */
};
static void i386nbsd_sigtramp_cache_init (const struct tramp_frame *,
struct frame_info *,
struct trad_frame_cache *,
CORE_ADDR);
static const struct tramp_frame i386nbsd_sigtramp_sc16 =
{
SIGTRAMP_FRAME,
1,
{
/* leal 0x10(%esp), %eax */
{ 0x8d, ULONGEST_MAX },
{ 0x44, ULONGEST_MAX },
{ 0x24, ULONGEST_MAX },
{ 0x10, ULONGEST_MAX },
/* pushl %eax */
{ 0x50, ULONGEST_MAX },
/* pushl %eax */
{ 0x50, ULONGEST_MAX },
/* movl $0x127, %eax # __sigreturn14 */
{ 0xb8, ULONGEST_MAX },
{ 0x27, ULONGEST_MAX },
{0x01, ULONGEST_MAX },
{0x00, ULONGEST_MAX },
{0x00, ULONGEST_MAX },
/* int $0x80 */
{ 0xcd, ULONGEST_MAX },
{ 0x80, ULONGEST_MAX},
/* movl $0x1, %eax # exit */
{ 0xb8, ULONGEST_MAX },
{ 0x01, ULONGEST_MAX },
{0x00, ULONGEST_MAX },
{0x00, ULONGEST_MAX },
{0x00, ULONGEST_MAX },
/* int $0x80 */
{ 0xcd, ULONGEST_MAX },
{ 0x80, ULONGEST_MAX},
{ TRAMP_SENTINEL_INSN, ULONGEST_MAX }
},
i386nbsd_sigtramp_cache_init
};
static const struct tramp_frame i386nbsd_sigtramp_sc2 =
{
SIGTRAMP_FRAME,
1,
{
/* leal 0x0c(%esp), %eax */
{ 0x8d, ULONGEST_MAX },
{ 0x44, ULONGEST_MAX },
{ 0x24, ULONGEST_MAX },
{ 0x0c, ULONGEST_MAX },
/* movl %eax, 0x4(%esp) */
{ 0x89, ULONGEST_MAX },
{ 0x44, ULONGEST_MAX },
{ 0x24, ULONGEST_MAX },
{ 0x04, ULONGEST_MAX },
/* movl $0x127, %eax # __sigreturn14 */
{ 0xb8, ULONGEST_MAX },
{ 0x27, ULONGEST_MAX },
{0x01, ULONGEST_MAX },
{0x00, ULONGEST_MAX },
{0x00, ULONGEST_MAX },
/* int $0x80 */
{ 0xcd, ULONGEST_MAX },
{ 0x80, ULONGEST_MAX},
/* movl %eax, 0x4(%esp) */
{ 0x89, ULONGEST_MAX },
{ 0x44, ULONGEST_MAX },
{ 0x24, ULONGEST_MAX },
{ 0x04, ULONGEST_MAX },
/* movl $0x1, %eax */
{ 0xb8, ULONGEST_MAX },
{ 0x01, ULONGEST_MAX },
{0x00, ULONGEST_MAX },
{0x00, ULONGEST_MAX },
{0x00, ULONGEST_MAX },
/* int $0x80 */
{ 0xcd, ULONGEST_MAX },
{ 0x80, ULONGEST_MAX},
{ TRAMP_SENTINEL_INSN, ULONGEST_MAX }
},
i386nbsd_sigtramp_cache_init
};
static const struct tramp_frame i386nbsd_sigtramp_si2 =
{
SIGTRAMP_FRAME,
1,
{
/* movl 8(%esp),%eax */
{ 0x8b, ULONGEST_MAX },
{ 0x44, ULONGEST_MAX },
{ 0x24, ULONGEST_MAX },
{ 0x08, ULONGEST_MAX },
/* movl %eax, 0x4(%esp) */
{ 0x89, ULONGEST_MAX },
{ 0x44, ULONGEST_MAX },
{ 0x24, ULONGEST_MAX },
{ 0x04, ULONGEST_MAX },
/* movl $0x134, %eax # setcontext */
{ 0xb8, ULONGEST_MAX },
{ 0x34, ULONGEST_MAX },
{ 0x01, ULONGEST_MAX },
{ 0x00, ULONGEST_MAX },
{ 0x00, ULONGEST_MAX },
/* int $0x80 */
{ 0xcd, ULONGEST_MAX },
{ 0x80, ULONGEST_MAX },
/* movl %eax, 0x4(%esp) */
{ 0x89, ULONGEST_MAX },
{ 0x44, ULONGEST_MAX },
{ 0x24, ULONGEST_MAX },
{ 0x04, ULONGEST_MAX },
/* movl $0x1, %eax */
{ 0xb8, ULONGEST_MAX },
{ 0x01, ULONGEST_MAX },
{ 0x00, ULONGEST_MAX },
{ 0x00, ULONGEST_MAX },
{ 0x00, ULONGEST_MAX },
/* int $0x80 */
{ 0xcd, ULONGEST_MAX },
{ 0x80, ULONGEST_MAX },
{ TRAMP_SENTINEL_INSN, ULONGEST_MAX }
},
i386nbsd_sigtramp_cache_init
};
static const struct tramp_frame i386nbsd_sigtramp_si31 =
{
SIGTRAMP_FRAME,
1,
{
/* leal 0x8c(%esp), %eax */
{ 0x8d, ULONGEST_MAX },
{ 0x84, ULONGEST_MAX },
{ 0x24, ULONGEST_MAX },
{ 0x8c, ULONGEST_MAX },
{ 0x00, ULONGEST_MAX },
{ 0x00, ULONGEST_MAX },
{ 0x00, ULONGEST_MAX },
/* movl %eax, 0x4(%esp) */
{ 0x89, ULONGEST_MAX },
{ 0x44, ULONGEST_MAX },
{ 0x24, ULONGEST_MAX },
{ 0x04, ULONGEST_MAX },
/* movl $0x134, %eax # setcontext */
{ 0xb8, ULONGEST_MAX },
{ 0x34, ULONGEST_MAX },
{ 0x01, ULONGEST_MAX },
{ 0x00, ULONGEST_MAX },
{ 0x00, ULONGEST_MAX },
/* int $0x80 */
{ 0xcd, ULONGEST_MAX },
{ 0x80, ULONGEST_MAX},
/* movl %eax, 0x4(%esp) */
{ 0x89, ULONGEST_MAX },
{ 0x44, ULONGEST_MAX },
{ 0x24, ULONGEST_MAX },
{ 0x04, ULONGEST_MAX },
/* movl $0x1, %eax */
{ 0xb8, ULONGEST_MAX },
{ 0x01, ULONGEST_MAX },
{0x00, ULONGEST_MAX },
{0x00, ULONGEST_MAX },
{0x00, ULONGEST_MAX },
/* int $0x80 */
{ 0xcd, ULONGEST_MAX },
{ 0x80, ULONGEST_MAX},
{ TRAMP_SENTINEL_INSN, ULONGEST_MAX }
},
i386nbsd_sigtramp_cache_init
};
static const struct tramp_frame i386nbsd_sigtramp_si4 =
{
SIGTRAMP_FRAME,
1,
{
/* leal 0x8c(%esp), %eax */
{ 0x8d, ULONGEST_MAX },
{ 0x84, ULONGEST_MAX },
{ 0x24, ULONGEST_MAX },
{ 0x8c, ULONGEST_MAX },
{ 0x00, ULONGEST_MAX },
{ 0x00, ULONGEST_MAX },
{ 0x00, ULONGEST_MAX },
/* movl %eax, 0x4(%esp) */
{ 0x89, ULONGEST_MAX },
{ 0x44, ULONGEST_MAX },
{ 0x24, ULONGEST_MAX },
{ 0x04, ULONGEST_MAX },
/* movl $0x134, %eax # setcontext */
{ 0xb8, ULONGEST_MAX },
{ 0x34, ULONGEST_MAX },
{ 0x01, ULONGEST_MAX },
{ 0x00, ULONGEST_MAX },
{ 0x00, ULONGEST_MAX },
/* int $0x80 */
{ 0xcd, ULONGEST_MAX },
{ 0x80, ULONGEST_MAX},
/* movl $0xffffffff,0x4(%esp) */
{ 0xc7, ULONGEST_MAX },
{ 0x44, ULONGEST_MAX },
{ 0x24, ULONGEST_MAX },
{ 0x04, ULONGEST_MAX },
{ 0xff, ULONGEST_MAX },
{ 0xff, ULONGEST_MAX },
{ 0xff, ULONGEST_MAX },
{ 0xff, ULONGEST_MAX },
/* movl $0x1, %eax */
{ 0xb8, ULONGEST_MAX },
{ 0x01, ULONGEST_MAX },
{0x00, ULONGEST_MAX },
{0x00, ULONGEST_MAX },
{0x00, ULONGEST_MAX },
/* int $0x80 */
{ 0xcd, ULONGEST_MAX },
{ 0x80, ULONGEST_MAX},
{ TRAMP_SENTINEL_INSN, ULONGEST_MAX }
},
i386nbsd_sigtramp_cache_init
};
static void
i386nbsd_sigtramp_cache_init (const struct tramp_frame *self,
struct frame_info *this_frame,
struct trad_frame_cache *this_cache,
CORE_ADDR func)
{
struct gdbarch *gdbarch = get_frame_arch (this_frame);
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
CORE_ADDR sp = get_frame_register_unsigned (this_frame, I386_ESP_REGNUM);
CORE_ADDR base;
int *reg_offset;
int num_regs;
int i;
if (self == &i386nbsd_sigtramp_sc16 || self == &i386nbsd_sigtramp_sc2)
{
reg_offset = i386nbsd_sc_reg_offset;
num_regs = ARRAY_SIZE (i386nbsd_sc_reg_offset);
/* Read in the sigcontext address. */
base = read_memory_unsigned_integer (sp + 8, 4, byte_order);
}
else
{
reg_offset = i386nbsd_mc_reg_offset;
num_regs = ARRAY_SIZE (i386nbsd_mc_reg_offset);
/* Read in the ucontext address. */
base = read_memory_unsigned_integer (sp + 8, 4, byte_order);
/* offsetof(ucontext_t, uc_mcontext) == 36 */
base += 36;
}
for (i = 0; i < num_regs; i++)
if (reg_offset[i] != -1)
trad_frame_set_reg_addr (this_cache, i, base + reg_offset[i]);
/* Construct the frame ID using the function start. */
trad_frame_set_id (this_cache, frame_id_build (sp, func));
}
static void
i386nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
i386_gdbarch_tdep *tdep = (i386_gdbarch_tdep *) gdbarch_tdep (gdbarch);
/* Obviously NetBSD is BSD-based. */
i386bsd_init_abi (info, gdbarch);
nbsd_init_abi (info, gdbarch);
/* NetBSD has a different `struct reg'. */
tdep->gregset_reg_offset = i386nbsd_r_reg_offset;
tdep->gregset_num_regs = ARRAY_SIZE (i386nbsd_r_reg_offset);
tdep->sizeof_gregset = 16 * 4;
/* NetBSD uses -freg-struct-return by default. */
tdep->struct_return = reg_struct_return;
/* NetBSD uses tramp_frame sniffers for signal trampolines. */
tdep->sigcontext_addr= 0;
tdep->sigtramp_start = 0;
tdep->sigtramp_end = 0;
tdep->sigtramp_p = 0;
tdep->sc_reg_offset = 0;
tdep->sc_num_regs = 0;
tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_sc16);
tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_sc2);
tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_si2);
tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_si31);
tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_si4);
}
/* NetBSD ELF. */
static void
i386nbsdelf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
i386_gdbarch_tdep *tdep = (i386_gdbarch_tdep *) gdbarch_tdep (gdbarch);
/* It's still NetBSD. */
i386nbsd_init_abi (info, gdbarch);
/* But ELF-based. */
i386_elf_init_abi (info, gdbarch);
/* NetBSD ELF uses SVR4-style shared libraries. */
set_solib_svr4_fetch_link_map_offsets
(gdbarch, svr4_ilp32_fetch_link_map_offsets);
/* NetBSD ELF uses -fpcc-struct-return by default. */
tdep->struct_return = pcc_struct_return;
}
void _initialize_i386nbsd_tdep ();
void
_initialize_i386nbsd_tdep ()
{
gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_NETBSD,
i386nbsdelf_init_abi);
}