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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>
211 lines
6.9 KiB
C
211 lines
6.9 KiB
C
/* GNU/Linux on TI C6x target support.
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Copyright (C) 2011-2025 Free Software Foundation, Inc.
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Contributed by Yao Qi <yao@codesourcery.com>
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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 "solib.h"
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#include "osabi.h"
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#include "linux-tdep.h"
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#include "tic6x-tdep.h"
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#include "trad-frame.h"
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#include "tramp-frame.h"
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#include "elf-bfd.h"
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#include "elf/tic6x.h"
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#include "gdbarch.h"
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#include "solib-dsbt.h"
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/* The offset from rt_sigframe pointer to SP register. */
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#define TIC6X_SP_RT_SIGFRAME 8
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/* Size of struct siginfo info. */
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#define TIC6X_SIGINFO_SIZE 128
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/* Size of type stack_t, which contains three fields of type void*, int, and
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size_t respectively. */
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#define TIC6X_STACK_T_SIZE (3 * 4)
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static const gdb_byte tic6x_bkpt_bnop_be[] = { 0x00, 0x00, 0xa1, 0x22 };
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static const gdb_byte tic6x_bkpt_bnop_le[] = { 0x22, 0xa1, 0x00, 0x00 };
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/* Return the offset of register REGNUM in struct sigcontext. Return 0 if no
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such register in sigcontext. */
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static unsigned int
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tic6x_register_sigcontext_offset (unsigned int regnum, struct gdbarch *gdbarch)
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{
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tic6x_gdbarch_tdep *tdep = gdbarch_tdep<tic6x_gdbarch_tdep> (gdbarch);
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if (regnum == TIC6X_A4_REGNUM || regnum == TIC6X_A4_REGNUM + 2
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|| regnum == TIC6X_A4_REGNUM + 4)
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return 4 * (regnum - TIC6X_A4_REGNUM + 2); /* A4, A6, A8 */
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else if (regnum == TIC6X_A5_REGNUM || regnum == TIC6X_A5_REGNUM + 2
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|| regnum == TIC6X_A5_REGNUM + 4)
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return 4 * (regnum - TIC6X_A5_REGNUM + 12); /* A5, A7, A9 */
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else if (regnum == TIC6X_B4_REGNUM || regnum == TIC6X_B4_REGNUM + 2
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|| regnum == TIC6X_B4_REGNUM + 4)
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return 4 * (regnum - TIC6X_B4_REGNUM + 3); /* B4, B6, B8 */
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else if (regnum == TIC6X_B5_REGNUM || regnum == TIC6X_B5_REGNUM + 2
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|| regnum == TIC6X_B5_REGNUM + 4)
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return 4 * (regnum - TIC6X_B5_REGNUM + 19); /* B5, B7, B9 */
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else if (regnum < TIC6X_A4_REGNUM)
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return 4 * (regnum - 0 + 8); /* A0 - A3 */
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else if (regnum >= TIC6X_B0_REGNUM && regnum < TIC6X_B4_REGNUM)
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return 4 * (regnum - TIC6X_B0_REGNUM + 15); /* B0 - B3 */
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else if (regnum >= 34 && regnum < 34 + 32)
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return 4 * (regnum - 34 + 23); /* A16 - A31, B16 - B31 */
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else if (regnum == TIC6X_PC_REGNUM)
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return 4 * (tdep->has_gp ? 55 : 23);
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else if (regnum == TIC6X_SP_REGNUM)
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return 4;
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return 0;
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}
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/* Support unwinding frame in signal trampoline. We don't check sigreturn,
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since it is not used in kernel. */
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static void
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tic6x_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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struct gdbarch *gdbarch = get_frame_arch (this_frame);
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CORE_ADDR sp = get_frame_register_unsigned (this_frame, TIC6X_SP_REGNUM);
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/* The base of struct sigcontext is computed by examining the definition of
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struct rt_sigframe in linux kernel source arch/c6x/kernel/signal.c. */
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CORE_ADDR base = (sp + TIC6X_SP_RT_SIGFRAME
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/* Pointer type *pinfo and *puc in struct rt_sigframe. */
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+ 4 + 4
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+ TIC6X_SIGINFO_SIZE
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+ 4 + 4 /* uc_flags and *uc_link in struct ucontext. */
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+ TIC6X_STACK_T_SIZE);
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tic6x_gdbarch_tdep *tdep = gdbarch_tdep<tic6x_gdbarch_tdep> (gdbarch);
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unsigned int reg_offset;
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unsigned int i;
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for (i = 0; i < 10; i++) /* A0 - A9 */
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{
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reg_offset = tic6x_register_sigcontext_offset (i, gdbarch);
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gdb_assert (reg_offset != 0);
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trad_frame_set_reg_addr (this_cache, i, base + reg_offset);
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}
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for (i = TIC6X_B0_REGNUM; i < TIC6X_B0_REGNUM + 10; i++) /* B0 - B9 */
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{
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reg_offset = tic6x_register_sigcontext_offset (i, gdbarch);
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gdb_assert (reg_offset != 0);
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trad_frame_set_reg_addr (this_cache, i, base + reg_offset);
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}
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if (tdep->has_gp)
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for (i = 34; i < 34 + 32; i++) /* A16 - A31, B16 - B31 */
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{
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reg_offset = tic6x_register_sigcontext_offset (i, gdbarch);
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gdb_assert (reg_offset != 0);
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trad_frame_set_reg_addr (this_cache, i, base + reg_offset);
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}
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trad_frame_set_reg_addr (this_cache, TIC6X_PC_REGNUM,
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base + tic6x_register_sigcontext_offset (TIC6X_PC_REGNUM,
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gdbarch));
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trad_frame_set_reg_addr (this_cache, TIC6X_SP_REGNUM,
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base + tic6x_register_sigcontext_offset (TIC6X_SP_REGNUM,
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gdbarch));
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/* Save a frame ID. */
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trad_frame_set_id (this_cache, frame_id_build (sp, func));
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}
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static struct tramp_frame tic6x_linux_rt_sigreturn_tramp_frame =
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{
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SIGTRAMP_FRAME,
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4,
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{
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{0x000045aa, 0x0fffffff}, /* mvk .S2 139,b0 */
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{0x10000000, ULONGEST_MAX}, /* swe */
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{TRAMP_SENTINEL_INSN}
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},
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tic6x_linux_rt_sigreturn_init
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};
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/* When FRAME is at a syscall instruction, return the PC of the next
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instruction to be executed. */
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static CORE_ADDR
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tic6x_linux_syscall_next_pc (const frame_info_ptr &frame)
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{
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ULONGEST syscall_number = get_frame_register_unsigned (frame,
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TIC6X_B0_REGNUM);
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CORE_ADDR pc = get_frame_pc (frame);
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if (syscall_number == 139 /* rt_sigreturn */)
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return frame_unwind_caller_pc (frame);
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return pc + 4;
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}
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static void
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tic6x_uclinux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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tic6x_gdbarch_tdep *tdep = gdbarch_tdep<tic6x_gdbarch_tdep> (gdbarch);
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linux_init_abi (info, gdbarch, 0);
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/* Shared library handling. */
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set_gdbarch_make_solib_ops (gdbarch, make_dsbt_solib_ops);
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tdep->syscall_next_pc = tic6x_linux_syscall_next_pc;
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#ifdef HAVE_ELF
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/* In tic6x Linux kernel, breakpoint instructions varies on different archs.
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On C64x+ and C67x+, breakpoint instruction is 0x56454314, which is an
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illegal opcode. On other arch, breakpoint instruction is 0x0000a122
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(BNOP .S2 0,5). */
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if (info.abfd)
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switch (bfd_elf_get_obj_attr_int (info.abfd, OBJ_ATTR_PROC, Tag_ISA))
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{
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case C6XABI_Tag_ISA_C64XP:
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case C6XABI_Tag_ISA_C67XP:
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if (info.byte_order == BFD_ENDIAN_BIG)
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tdep->breakpoint = tic6x_bkpt_illegal_opcode_be;
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else
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tdep->breakpoint = tic6x_bkpt_illegal_opcode_le;
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break;
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default:
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{
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if (info.byte_order == BFD_ENDIAN_BIG)
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tdep->breakpoint = tic6x_bkpt_bnop_be;
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else
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tdep->breakpoint = tic6x_bkpt_bnop_le;
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}
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}
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#endif
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/* Signal trampoline support. */
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tramp_frame_prepend_unwinder (gdbarch,
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&tic6x_linux_rt_sigreturn_tramp_frame);
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}
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INIT_GDB_FILE (tic6x_linux_tdep)
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{
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gdbarch_register_osabi (bfd_arch_tic6x, 0, GDB_OSABI_LINUX,
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tic6x_uclinux_init_abi);
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}
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