mirror of
https://github.com/bminor/binutils-gdb.git
synced 2025-11-16 12:34:43 +00:00
a2e3cce344
Convert solib_ops into an abstract base class (with abstract methods,
some of them with default implementations) and convert all the existing
solib_ops instances to solib_ops derived classes / implementations.
Prior to this patch, solib_ops is a structure holding function pointers,
of which there are only a handful of global instances (in the
`solib-*.c` files). When passing an `solib_ops *` around, it's a
pointer to one of these instances. After this patch, there are no more
global solib_ops instances. Instances are created as needed and stored
in struct program_space. These instances could eventually be made to
contain the program space-specific data, which is currently kept in
per-program space registries (I have some pending patches for that).
Prior to this patch, `gdbarch_so_ops` is a gdbarch method that returns a
pointer to the appropriate solib_ops implementation for the gdbarch.
This is replaced with the `gdbarch_make_solib_ops` method, which returns
a new instance of the appropriate solib_ops implementation for this
gdbarch. This requires introducing some factory functions for the
various solib_ops implementation, to be used as `gdbarch_make_solib_ops`
callbacks. For instance:
solib_ops_up
make_linux_ilp32_svr4_solib_ops ()
{
return std::make_unique<linux_ilp32_svr4_solib_ops> ();
}
The previous code is full of cases of tdep files copying some base
solib_ops implementation, and overriding one or more function pointer
(see ppc_linux_init_abi, for instance). I tried to convert all of this
is a class hierarchy. I like that it's now possible to get a good
static view of all the existing solib_ops variants. The hierarchy looks
like this:
solib_ops
├── aix_solib_ops
├── darwin_solib_ops
├── dsbt_solib_ops
├── frv_solib_ops
├── rocm_solib_ops
├── svr4_solib_ops
│ ├── ilp32_svr4_solib_ops
│ ├── lp64_svr4_solib_ops
│ ├── linux_ilp32_svr4_solib_ops
│ │ ├── mips_linux_ilp32_svr4_solib_ops
│ │ └── ppc_linux_ilp32_svr4_solib_ops
│ ├── linux_lp64_svr4_solib_ops
│ │ └── mips_linux_lp64_svr4_solib_ops
│ ├── mips_nbsd_ilp32_svr4_solib_ops
│ ├── mips_nbsd_lp64_svr4_solib_ops
│ ├── mips_fbsd_ilp32_svr4_solib_ops
│ └── mips_fbsd_lp64_svr4_solib_ops
└── target_solib_ops
└── windows_solib_ops
The solib-svr4 code has per-arch specialization to provide a
link_map_offsets, containing the offsets of the interesting fields in
`struct link_map` on that particular architecture. Prior to this patch,
arches would set a callback returning the appropriate link_map_offsets
by calling `set_solib_svr4_fetch_link_map_offsets`, which also happened
to set the gdbarch's so_ops to `&svr_so_ops`. I converted this to an
abstract virtual method of `struct svr4_solib_ops`, meaning that all
classes deriving from svr4_solib_ops must provide a method returning the
appropriate link_map_offsets for the architecture. I renamed
`set_solib_svr4_fetch_link_map_offsets` to `set_solib_svr4_ops`. This
function is still necessary because it also calls
set_gdbarch_iterate_over_objfiles_in_search_order, but if it was not for
that, we could get rid of it.
There is an instance of CRTP in mips-linux-tdep.c, because both
mips_linux_ilp32_svr4_solib_ops and mips_linux_lp64_svr4_solib_ops need
to derive from different SVR4 base classes (linux_ilp32_svr4_solib_ops
and linux_lp64_svr4_solib_ops), but they both want to override the
in_dynsym_resolve_code method with the same implementation.
The solib_ops::supports_namespaces method is new: the support for
namespaces was previously predicated by the presence or absence of a
find_solib_ns method. It now needs to be explicit.
There is a new progspace::release_solib_ops method, which is only needed
for rocm_solib_ops. For the moment, rocm_solib_ops replaces and wraps
the existing svr4_solib_ops instance, in order to combine the results of
the two. The plan is to have a subsequent patch to allow program spaces to have
multiple solib_ops, removing the need for release_solib_ops.
Speaking of rocm_solib_ops: it previously overrode only a few methods by
copying svr4_solib_ops and overwriting some function pointers. Now, it
needs to implement all the methods that svr4_solib_ops implements, in
order to forward the call. Otherwise, the default solib_ops method
would be called, hiding the svr4_solib_ops implementation. Again, this
can be removed once we have support for multiple solib_ops in a
program_space.
There is also a small change in how rocm_solib_ops is activated. Prior
to this patch, it's done at the end of rocm_update_solib_list. Since it
overrides the function pointer in the static svr4_solib_ops, and then
overwrites the host gdbarch, so_ops field, it's something that happens
only once. After the patch though, we need to set rocm_solib_ops in all
the program spaces that appear. We do this in
rocm_solib_target_inferior_created and in the new
rocm_solib_target_inferior_execd. After this, I will explore doing a
change where rocm_solib_ops is only set when we detect the ROCm runtime
is loaded.
Change-Id: I5896b5bcbf8bdb024d67980380feba1ffefaa4c9
Approved-By: Pedro Alves <pedro@palves.net>
141 lines
4.0 KiB
C
141 lines
4.0 KiB
C
/* Target-dependent code for GNU/Linux on Tilera TILE-Gx processors.
|
|
|
|
Copyright (C) 2012-2025 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 "osabi.h"
|
|
#include "linux-tdep.h"
|
|
#include "solib-svr4-linux.h"
|
|
#include "glibc-tdep.h"
|
|
#include "solib-svr4.h"
|
|
#include "symtab.h"
|
|
#include "regcache.h"
|
|
#include "regset.h"
|
|
#include "tramp-frame.h"
|
|
#include "trad-frame.h"
|
|
#include "tilegx-tdep.h"
|
|
#include "gdbarch.h"
|
|
|
|
/* Signal trampoline support. */
|
|
|
|
static void
|
|
tilegx_linux_sigframe_init (const struct tramp_frame *self,
|
|
const frame_info_ptr &this_frame,
|
|
struct trad_frame_cache *this_cache,
|
|
CORE_ADDR func)
|
|
{
|
|
CORE_ADDR sp = get_frame_register_unsigned (this_frame, 54);
|
|
|
|
/* Base address of register save area. */
|
|
CORE_ADDR base = sp
|
|
+ 16 /* Skip ABI_SAVE_AREA. */
|
|
+ 128 /* Skip SIGINFO. */
|
|
+ 40; /* Skip UCONTEXT. */
|
|
|
|
/* Address of saved LR register (R56) which holds previous PC. */
|
|
CORE_ADDR prev_pc = base + 56 * 8;
|
|
|
|
int i;
|
|
|
|
for (i = 0; i < 56; i++)
|
|
trad_frame_set_reg_addr (this_cache, i, base + i * 8);
|
|
|
|
trad_frame_set_reg_value (this_cache, 64,
|
|
get_frame_memory_unsigned (this_frame, prev_pc, 8));
|
|
|
|
/* Save a frame ID. */
|
|
trad_frame_set_id (this_cache, frame_id_build (base, func));
|
|
}
|
|
|
|
static const struct tramp_frame tilegx_linux_rt_sigframe =
|
|
{
|
|
SIGTRAMP_FRAME,
|
|
8,
|
|
{
|
|
{ 0x00045fe551483000ULL, ULONGEST_MAX }, /* { moveli r10, 139 } */
|
|
{ 0x286b180051485000ULL, ULONGEST_MAX }, /* { swint1 } */
|
|
{ TRAMP_SENTINEL_INSN, ULONGEST_MAX }
|
|
},
|
|
tilegx_linux_sigframe_init
|
|
};
|
|
|
|
/* Register map; must match struct pt_regs in "ptrace.h". */
|
|
|
|
static const struct regcache_map_entry tilegx_linux_regmap[] =
|
|
{
|
|
{ TILEGX_NUM_EASY_REGS, TILEGX_FIRST_EASY_REGNUM, 8 },
|
|
{ 1, TILEGX_PC_REGNUM, 8 },
|
|
{ 1, TILEGX_FAULTNUM_REGNUM, 8 },
|
|
{ 0 }
|
|
};
|
|
|
|
#define TILEGX_LINUX_SIZEOF_GREGSET (64 * 8)
|
|
|
|
/* TILE-Gx Linux kernel register set. */
|
|
|
|
static const struct regset tilegx_linux_regset =
|
|
{
|
|
tilegx_linux_regmap,
|
|
regcache_supply_regset, regcache_collect_regset
|
|
};
|
|
|
|
|
|
static void
|
|
tilegx_iterate_over_regset_sections (struct gdbarch *gdbarch,
|
|
iterate_over_regset_sections_cb *cb,
|
|
void *cb_data,
|
|
const struct regcache *regcache)
|
|
{
|
|
cb (".reg", TILEGX_LINUX_SIZEOF_GREGSET, TILEGX_LINUX_SIZEOF_GREGSET,
|
|
&tilegx_linux_regset, NULL, cb_data);
|
|
}
|
|
|
|
/* OS specific initialization of gdbarch. */
|
|
|
|
static void
|
|
tilegx_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
|
|
{
|
|
int arch_size = gdbarch_addr_bit (gdbarch);
|
|
|
|
linux_init_abi (info, gdbarch, 0);
|
|
|
|
tramp_frame_prepend_unwinder (gdbarch, &tilegx_linux_rt_sigframe);
|
|
|
|
set_gdbarch_iterate_over_regset_sections
|
|
(gdbarch, tilegx_iterate_over_regset_sections);
|
|
|
|
/* GNU/Linux uses SVR4-style shared libraries. */
|
|
if (arch_size == 32)
|
|
set_solib_svr4_ops (gdbarch, make_linux_ilp32_svr4_solib_ops);
|
|
else
|
|
set_solib_svr4_ops (gdbarch, make_linux_lp64_svr4_solib_ops);
|
|
|
|
/* Enable TLS support. */
|
|
set_gdbarch_fetch_tls_load_module_address (gdbarch,
|
|
svr4_fetch_objfile_link_map);
|
|
|
|
/* Shared library handling. */
|
|
set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
|
|
set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver);
|
|
}
|
|
|
|
INIT_GDB_FILE (tilegx_linux_tdep)
|
|
{
|
|
gdbarch_register_osabi (bfd_arch_tilegx, bfd_mach_tilegx, GDB_OSABI_LINUX,
|
|
tilegx_linux_init_abi);
|
|
}
|