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- /* GNU/Linux on TI C6x target support.
- Copyright (C) 2011-2022 Free Software Foundation, Inc.
- Contributed by Yao Qi <yao@codesourcery.com>
- 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 "defs.h"
- #include "solib.h"
- #include "osabi.h"
- #include "linux-tdep.h"
- #include "tic6x-tdep.h"
- #include "trad-frame.h"
- #include "tramp-frame.h"
- #include "elf-bfd.h"
- #include "elf/tic6x.h"
- #include "gdbarch.h"
- /* The offset from rt_sigframe pointer to SP register. */
- #define TIC6X_SP_RT_SIGFRAME 8
- /* Size of struct siginfo info. */
- #define TIC6X_SIGINFO_SIZE 128
- /* Size of type stack_t, which contains three fields of type void*, int, and
- size_t respectively. */
- #define TIC6X_STACK_T_SIZE (3 * 4)
- static const gdb_byte tic6x_bkpt_bnop_be[] = { 0x00, 0x00, 0xa1, 0x22 };
- static const gdb_byte tic6x_bkpt_bnop_le[] = { 0x22, 0xa1, 0x00, 0x00 };
- /* Return the offset of register REGNUM in struct sigcontext. Return 0 if no
- such register in sigcontext. */
- static unsigned int
- tic6x_register_sigcontext_offset (unsigned int regnum, struct gdbarch *gdbarch)
- {
- tic6x_gdbarch_tdep *tdep = (tic6x_gdbarch_tdep *) gdbarch_tdep (gdbarch);
- if (regnum == TIC6X_A4_REGNUM || regnum == TIC6X_A4_REGNUM + 2
- || regnum == TIC6X_A4_REGNUM + 4)
- return 4 * (regnum - TIC6X_A4_REGNUM + 2); /* A4, A6, A8 */
- else if (regnum == TIC6X_A5_REGNUM || regnum == TIC6X_A5_REGNUM + 2
- || regnum == TIC6X_A5_REGNUM + 4)
- return 4 * (regnum - TIC6X_A5_REGNUM + 12); /* A5, A7, A9 */
- else if (regnum == TIC6X_B4_REGNUM || regnum == TIC6X_B4_REGNUM + 2
- || regnum == TIC6X_B4_REGNUM + 4)
- return 4 * (regnum - TIC6X_B4_REGNUM + 3); /* B4, B6, B8 */
- else if (regnum == TIC6X_B5_REGNUM || regnum == TIC6X_B5_REGNUM + 2
- || regnum == TIC6X_B5_REGNUM + 4)
- return 4 * (regnum - TIC6X_B5_REGNUM + 19); /* B5, B7, B9 */
- else if (regnum < TIC6X_A4_REGNUM)
- return 4 * (regnum - 0 + 8); /* A0 - A3 */
- else if (regnum >= TIC6X_B0_REGNUM && regnum < TIC6X_B4_REGNUM)
- return 4 * (regnum - TIC6X_B0_REGNUM + 15); /* B0 - B3 */
- else if (regnum >= 34 && regnum < 34 + 32)
- return 4 * (regnum - 34 + 23); /* A16 - A31, B16 - B31 */
- else if (regnum == TIC6X_PC_REGNUM)
- return 4 * (tdep->has_gp ? 55 : 23);
- else if (regnum == TIC6X_SP_REGNUM)
- return 4;
- return 0;
- }
- /* Support unwinding frame in signal trampoline. We don't check sigreturn,
- since it is not used in kernel. */
- static void
- tic6x_linux_rt_sigreturn_init (const struct tramp_frame *self,
- struct frame_info *this_frame,
- struct trad_frame_cache *this_cache,
- CORE_ADDR func)
- {
- struct gdbarch *gdbarch = get_frame_arch (this_frame);
- CORE_ADDR sp = get_frame_register_unsigned (this_frame, TIC6X_SP_REGNUM);
- /* The base of struct sigcontext is computed by examining the definition of
- struct rt_sigframe in linux kernel source arch/c6x/kernel/signal.c. */
- CORE_ADDR base = (sp + TIC6X_SP_RT_SIGFRAME
- /* Pointer type *pinfo and *puc in struct rt_sigframe. */
- + 4 + 4
- + TIC6X_SIGINFO_SIZE
- + 4 + 4 /* uc_flags and *uc_link in struct ucontext. */
- + TIC6X_STACK_T_SIZE);
- tic6x_gdbarch_tdep *tdep = (tic6x_gdbarch_tdep *) gdbarch_tdep (gdbarch);
- unsigned int reg_offset;
- unsigned int i;
- for (i = 0; i < 10; i++) /* A0 - A9 */
- {
- reg_offset = tic6x_register_sigcontext_offset (i, gdbarch);
- gdb_assert (reg_offset != 0);
- trad_frame_set_reg_addr (this_cache, i, base + reg_offset);
- }
- for (i = TIC6X_B0_REGNUM; i < TIC6X_B0_REGNUM + 10; i++) /* B0 - B9 */
- {
- reg_offset = tic6x_register_sigcontext_offset (i, gdbarch);
- gdb_assert (reg_offset != 0);
- trad_frame_set_reg_addr (this_cache, i, base + reg_offset);
- }
- if (tdep->has_gp)
- for (i = 34; i < 34 + 32; i++) /* A16 - A31, B16 - B31 */
- {
- reg_offset = tic6x_register_sigcontext_offset (i, gdbarch);
- gdb_assert (reg_offset != 0);
- trad_frame_set_reg_addr (this_cache, i, base + reg_offset);
- }
- trad_frame_set_reg_addr (this_cache, TIC6X_PC_REGNUM,
- base + tic6x_register_sigcontext_offset (TIC6X_PC_REGNUM,
- gdbarch));
- trad_frame_set_reg_addr (this_cache, TIC6X_SP_REGNUM,
- base + tic6x_register_sigcontext_offset (TIC6X_SP_REGNUM,
- gdbarch));
- /* Save a frame ID. */
- trad_frame_set_id (this_cache, frame_id_build (sp, func));
- }
- static struct tramp_frame tic6x_linux_rt_sigreturn_tramp_frame =
- {
- SIGTRAMP_FRAME,
- 4,
- {
- {0x000045aa, 0x0fffffff}, /* mvk .S2 139,b0 */
- {0x10000000, ULONGEST_MAX}, /* swe */
- {TRAMP_SENTINEL_INSN}
- },
- tic6x_linux_rt_sigreturn_init
- };
- /* When FRAME is at a syscall instruction, return the PC of the next
- instruction to be executed. */
- static CORE_ADDR
- tic6x_linux_syscall_next_pc (struct frame_info *frame)
- {
- ULONGEST syscall_number = get_frame_register_unsigned (frame,
- TIC6X_B0_REGNUM);
- CORE_ADDR pc = get_frame_pc (frame);
- if (syscall_number == 139 /* rt_sigreturn */)
- return frame_unwind_caller_pc (frame);
- return pc + 4;
- }
- extern struct target_so_ops dsbt_so_ops;
- static void
- tic6x_uclinux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
- {
- tic6x_gdbarch_tdep *tdep = (tic6x_gdbarch_tdep *) gdbarch_tdep (gdbarch);
- linux_init_abi (info, gdbarch, 0);
- /* Shared library handling. */
- set_solib_ops (gdbarch, &dsbt_so_ops);
- tdep->syscall_next_pc = tic6x_linux_syscall_next_pc;
- #ifdef HAVE_ELF
- /* In tic6x Linux kernel, breakpoint instructions varies on different archs.
- On C64x+ and C67x+, breakpoint instruction is 0x56454314, which is an
- illegal opcode. On other arch, breakpoint instruction is 0x0000a122
- (BNOP .S2 0,5). */
- if (info.abfd)
- switch (bfd_elf_get_obj_attr_int (info.abfd, OBJ_ATTR_PROC, Tag_ISA))
- {
- case C6XABI_Tag_ISA_C64XP:
- case C6XABI_Tag_ISA_C67XP:
- if (info.byte_order == BFD_ENDIAN_BIG)
- tdep->breakpoint = tic6x_bkpt_illegal_opcode_be;
- else
- tdep->breakpoint = tic6x_bkpt_illegal_opcode_le;
- break;
- default:
- {
- if (info.byte_order == BFD_ENDIAN_BIG)
- tdep->breakpoint = tic6x_bkpt_bnop_be;
- else
- tdep->breakpoint = tic6x_bkpt_bnop_le;
- }
- }
- #endif
- /* Signal trampoline support. */
- tramp_frame_prepend_unwinder (gdbarch,
- &tic6x_linux_rt_sigreturn_tramp_frame);
- }
- void _initialize_tic6x_linux_tdep ();
- void
- _initialize_tic6x_linux_tdep ()
- {
- gdbarch_register_osabi (bfd_arch_tic6x, 0, GDB_OSABI_LINUX,
- tic6x_uclinux_init_abi);
- }
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