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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>
214 lines
6.3 KiB
C
214 lines
6.3 KiB
C
/* Target-dependent code for GNU/Linux Super-H.
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Copyright (C) 2005-2025 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 "osabi.h"
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#include "solib-svr4.h"
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#include "symtab.h"
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#include "trad-frame.h"
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#include "tramp-frame.h"
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#include "glibc-tdep.h"
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#include "sh-tdep.h"
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#include "linux-tdep.h"
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#include "solib-svr4-linux.h"
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#include "gdbarch.h"
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#define REGSx16(base) \
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{(base), 0}, \
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{(base) + 1, 4}, \
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{(base) + 2, 8}, \
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{(base) + 3, 12}, \
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{(base) + 4, 16}, \
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{(base) + 5, 20}, \
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{(base) + 6, 24}, \
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{(base) + 7, 28}, \
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{(base) + 8, 32}, \
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{(base) + 9, 36}, \
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{(base) + 10, 40}, \
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{(base) + 11, 44}, \
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{(base) + 12, 48}, \
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{(base) + 13, 52}, \
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{(base) + 14, 56}, \
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{(base) + 15, 60}
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/* Describe the contents of the .reg section of the core file. */
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static const struct sh_corefile_regmap gregs_table[] =
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{
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REGSx16 (R0_REGNUM),
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{PC_REGNUM, 64},
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{PR_REGNUM, 68},
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{SR_REGNUM, 72},
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{GBR_REGNUM, 76},
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{MACH_REGNUM, 80},
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{MACL_REGNUM, 84},
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{-1 /* Terminator. */, 0}
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};
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/* Describe the contents of the .reg2 section of the core file. */
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static const struct sh_corefile_regmap fpregs_table[] =
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{
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REGSx16 (FR0_REGNUM),
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/* REGSx16 xfp_regs omitted. */
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{FPSCR_REGNUM, 128},
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{FPUL_REGNUM, 132},
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{-1 /* Terminator. */, 0}
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};
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/* SH signal handler frame support. */
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static void
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sh_linux_sigtramp_cache (const frame_info_ptr &this_frame,
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struct trad_frame_cache *this_cache,
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CORE_ADDR func, int regs_offset)
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{
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int i;
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struct gdbarch *gdbarch = get_frame_arch (this_frame);
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CORE_ADDR base = get_frame_register_unsigned (this_frame,
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gdbarch_sp_regnum (gdbarch));
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CORE_ADDR regs = base + regs_offset;
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for (i = 0; i < 18; i++)
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trad_frame_set_reg_addr (this_cache, i, regs + i * 4);
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trad_frame_set_reg_addr (this_cache, SR_REGNUM, regs + 18 * 4);
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trad_frame_set_reg_addr (this_cache, GBR_REGNUM, regs + 19 * 4);
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trad_frame_set_reg_addr (this_cache, MACH_REGNUM, regs + 20 * 4);
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trad_frame_set_reg_addr (this_cache, MACL_REGNUM, regs + 21 * 4);
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/* Restore FP state if we have an FPU. */
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if (gdbarch_fp0_regnum (gdbarch) != -1)
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{
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CORE_ADDR fpregs = regs + 22 * 4;
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for (i = FR0_REGNUM; i <= FP_LAST_REGNUM; i++)
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trad_frame_set_reg_addr (this_cache, i, fpregs + i * 4);
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trad_frame_set_reg_addr (this_cache, FPSCR_REGNUM, fpregs + 32 * 4);
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trad_frame_set_reg_addr (this_cache, FPUL_REGNUM, fpregs + 33 * 4);
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}
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/* Save a frame ID. */
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trad_frame_set_id (this_cache, frame_id_build (base, func));
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}
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/* Implement struct tramp_frame "init" callbacks for signal
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trampolines on 32-bit SH. */
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static void
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sh_linux_sigreturn_init (const struct tramp_frame *self,
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const frame_info_ptr &this_frame,
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struct trad_frame_cache *this_cache,
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CORE_ADDR func)
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{
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/* SH 32-bit sigframe: sigcontext at start of sigframe,
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registers start after a single 'oldmask' word. */
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sh_linux_sigtramp_cache (this_frame, this_cache, func, 4);
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}
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static void
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sh_linux_rt_sigreturn_init (const struct tramp_frame *self,
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const frame_info_ptr &this_frame,
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struct trad_frame_cache *this_cache,
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CORE_ADDR func)
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{
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/* SH 32-bit rt_sigframe: starts with a siginfo (128 bytes), then
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we can find sigcontext embedded within a ucontext (offset 20 bytes).
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Then registers start after a single 'oldmask' word. */
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sh_linux_sigtramp_cache (this_frame, this_cache, func,
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128 /* sizeof (struct siginfo) */
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+ 20 /* offsetof (struct ucontext, uc_mcontext) */
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+ 4 /* oldmask word at start of sigcontext */);
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}
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/* Instruction patterns. */
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#define SH_MOVW 0x9305
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#define SH_TRAP 0xc300
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#define SH_OR_R0_R0 0x200b
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/* SH sigreturn syscall numbers. */
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#define SH_NR_SIGRETURN 0x0077
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#define SH_NR_RT_SIGRETURN 0x00ad
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static struct tramp_frame sh_linux_sigreturn_tramp_frame = {
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SIGTRAMP_FRAME,
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2,
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{
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{ SH_MOVW, 0xffff },
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{ SH_TRAP, 0xff00 }, /* #imm argument part filtered out. */
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{ SH_OR_R0_R0, 0xffff },
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{ SH_OR_R0_R0, 0xffff },
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{ SH_OR_R0_R0, 0xffff },
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{ SH_OR_R0_R0, 0xffff },
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{ SH_OR_R0_R0, 0xffff },
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{ SH_NR_SIGRETURN, 0xffff },
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{ TRAMP_SENTINEL_INSN }
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},
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sh_linux_sigreturn_init
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};
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static struct tramp_frame sh_linux_rt_sigreturn_tramp_frame = {
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SIGTRAMP_FRAME,
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2,
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{
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{ SH_MOVW, 0xffff },
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{ SH_TRAP, 0xff00 }, /* #imm argument part filtered out. */
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{ SH_OR_R0_R0, 0xffff },
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{ SH_OR_R0_R0, 0xffff },
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{ SH_OR_R0_R0, 0xffff },
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{ SH_OR_R0_R0, 0xffff },
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{ SH_OR_R0_R0, 0xffff },
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{ SH_NR_RT_SIGRETURN, 0xffff },
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{ TRAMP_SENTINEL_INSN }
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},
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sh_linux_rt_sigreturn_init
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};
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static void
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sh_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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linux_init_abi (info, gdbarch, 0);
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/* GNU/Linux uses SVR4-style shared libraries. */
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set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
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set_solib_svr4_ops (gdbarch, make_linux_ilp32_svr4_solib_ops);
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set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver);
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set_gdbarch_fetch_tls_load_module_address (gdbarch,
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svr4_fetch_objfile_link_map);
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sh_gdbarch_tdep *tdep = gdbarch_tdep<sh_gdbarch_tdep> (gdbarch);
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/* Remember regset characteristics. The sizes should match
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elf_gregset_t and elf_fpregset_t from Linux. */
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tdep->core_gregmap = (struct sh_corefile_regmap *) gregs_table;
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tdep->sizeof_gregset = 92;
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tdep->core_fpregmap = (struct sh_corefile_regmap *) fpregs_table;
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tdep->sizeof_fpregset = 136;
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tramp_frame_prepend_unwinder (gdbarch, &sh_linux_sigreturn_tramp_frame);
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tramp_frame_prepend_unwinder (gdbarch, &sh_linux_rt_sigreturn_tramp_frame);
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}
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INIT_GDB_FILE (sh_linux_tdep)
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{
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gdbarch_register_osabi (bfd_arch_sh, 0, GDB_OSABI_LINUX, sh_linux_init_abi);
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}
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