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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>
161 lines
4.5 KiB
C
161 lines
4.5 KiB
C
/* Target-dependent code for OpenBSD/mips64.
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Copyright (C) 2004-2025 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 "gdbtypes.h"
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#include "osabi.h"
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#include "regcache.h"
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#include "regset.h"
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#include "trad-frame.h"
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#include "tramp-frame.h"
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#include "obsd-tdep.h"
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#include "mips-tdep.h"
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#include "solib-svr4.h"
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#define MIPS64OBSD_NUM_REGS 73
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/* Core file support. */
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/* Supply register REGNUM from the buffer specified by GREGS and LEN
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in the general-purpose register set REGSET to register cache
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REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
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static void
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mips64obsd_supply_gregset (const struct regset *regset,
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struct regcache *regcache, int regnum,
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const void *gregs, size_t len)
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{
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const char *regs = (const char *) gregs;
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int i;
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for (i = 0; i < MIPS64OBSD_NUM_REGS; i++)
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{
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if (regnum == i || regnum == -1)
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regcache->raw_supply (i, regs + i * 8);
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}
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}
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/* OpenBSD/mips64 register set. */
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static const struct regset mips64obsd_gregset =
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{
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NULL,
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mips64obsd_supply_gregset
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};
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/* Iterate over core file register note sections. */
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static void
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mips64obsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
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iterate_over_regset_sections_cb *cb,
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void *cb_data,
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const struct regcache *regcache)
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{
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cb (".reg", MIPS64OBSD_NUM_REGS * 8, MIPS64OBSD_NUM_REGS * 8,
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&mips64obsd_gregset, NULL, cb_data);
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}
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/* Signal trampolines. */
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static void
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mips64obsd_sigframe_init (const struct tramp_frame *self,
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const frame_info_ptr &this_frame,
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struct trad_frame_cache *cache,
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CORE_ADDR func)
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{
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struct gdbarch *gdbarch = get_frame_arch (this_frame);
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CORE_ADDR sp, sigcontext_addr, addr;
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int regnum;
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/* We find the appropriate instance of `struct sigcontext' at a
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fixed offset in the signal frame. */
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sp = get_frame_register_signed (this_frame,
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MIPS_SP_REGNUM + gdbarch_num_regs (gdbarch));
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sigcontext_addr = sp + 32;
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/* PC. */
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regnum = mips_regnum (gdbarch)->pc;
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trad_frame_set_reg_addr (cache,
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regnum + gdbarch_num_regs (gdbarch),
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sigcontext_addr + 16);
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/* GPRs. */
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for (regnum = MIPS_AT_REGNUM, addr = sigcontext_addr + 32;
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regnum <= MIPS_RA_REGNUM; regnum++, addr += 8)
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trad_frame_set_reg_addr (cache,
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regnum + gdbarch_num_regs (gdbarch),
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addr);
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/* HI and LO. */
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regnum = mips_regnum (gdbarch)->lo;
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trad_frame_set_reg_addr (cache,
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regnum + gdbarch_num_regs (gdbarch),
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sigcontext_addr + 280);
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regnum = mips_regnum (gdbarch)->hi;
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trad_frame_set_reg_addr (cache,
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regnum + gdbarch_num_regs (gdbarch),
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sigcontext_addr + 288);
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/* TODO: Handle the floating-point registers. */
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trad_frame_set_id (cache, frame_id_build (sp, func));
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}
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static const struct tramp_frame mips64obsd_sigframe =
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{
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SIGTRAMP_FRAME,
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MIPS_INSN32_SIZE,
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{
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{ 0x67a40020, ULONGEST_MAX }, /* daddiu a0,sp,32 */
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{ 0x24020067, ULONGEST_MAX }, /* li v0,103 */
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{ 0x0000000c, ULONGEST_MAX }, /* syscall */
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{ 0x0000000d, ULONGEST_MAX }, /* break */
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{ TRAMP_SENTINEL_INSN, ULONGEST_MAX }
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},
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mips64obsd_sigframe_init
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};
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static void
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mips64obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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/* OpenBSD/mips64 only supports the n64 ABI, but the braindamaged
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way GDB works, forces us to pretend we can handle them all. */
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set_gdbarch_iterate_over_regset_sections
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(gdbarch, mips64obsd_iterate_over_regset_sections);
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tramp_frame_prepend_unwinder (gdbarch, &mips64obsd_sigframe);
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set_gdbarch_long_double_bit (gdbarch, 128);
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set_gdbarch_long_double_format (gdbarch, floatformats_ieee_quad);
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obsd_init_abi(info, gdbarch);
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/* OpenBSD/mips64 has SVR4-style shared libraries. */
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set_solib_svr4_ops (gdbarch, make_svr4_lp64_solib_ops);
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}
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INIT_GDB_FILE (mips64obsd_tdep)
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{
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gdbarch_register_osabi (bfd_arch_mips, 0, GDB_OSABI_OPENBSD,
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mips64obsd_init_abi);
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}
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