mirror of
https://github.com/bminor/binutils-gdb.git
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1d506c26d9
This commit is the result of the following actions:
- Running gdb/copyright.py to update all of the copyright headers to
include 2024,
- Manually updating a few files the copyright.py script told me to
update, these files had copyright headers embedded within the
file,
- Regenerating gdbsupport/Makefile.in to refresh it's copyright
date,
- Using grep to find other files that still mentioned 2023. If
these files were updated last year from 2022 to 2023 then I've
updated them this year to 2024.
I'm sure I've probably missed some dates. Feel free to fix them up as
you spot them.
214 lines
6.9 KiB
C
214 lines
6.9 KiB
C
/* GNU/Linux on TI C6x target support.
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Copyright (C) 2011-2024 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 "defs.h"
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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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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 (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_so_ops (gdbarch, &dsbt_so_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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void _initialize_tic6x_linux_tdep ();
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void
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_initialize_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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