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- /* Target-dependent code for Analog Devices Blackfin processor, for GDB.
- Copyright (C) 2005-2022 Free Software Foundation, Inc.
- Contributed by Analog Devices, Inc.
- 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 "arch-utils.h"
- #include "regcache.h"
- #include "tramp-frame.h"
- #include "trad-frame.h"
- #include "osabi.h"
- #include "xml-syscall.h"
- #include "linux-tdep.h"
- #include "bfin-tdep.h"
- /* From <asm/sigcontext.h>. */
- #define SIGCONTEXT_OFFSET 168
- static const int bfin_linux_sigcontext_reg_offset[BFIN_NUM_REGS] =
- {
- 0 * 4, /* %r0 */
- 1 * 4, /* %r1 */
- 2 * 4, /* %r2 */
- 3 * 4, /* %r3 */
- 4 * 4, /* %r4 */
- 5 * 4, /* %r5 */
- 6 * 4, /* %r6 */
- 7 * 4, /* %r7 */
- 8 * 4, /* %p0 */
- 9 * 4, /* %p1 */
- 10 * 4, /* %p2 */
- 11 * 4, /* %p3 */
- 12 * 4, /* %p4 */
- 13 * 4, /* %p5 */
- 14 * 4, /* %sp */
- 23 * 4, /* %fp */
- 24 * 4, /* %i0 */
- 25 * 4, /* %i1 */
- 26 * 4, /* %i2 */
- 27 * 4, /* %i3 */
- 28 * 4, /* %m0 */
- 29 * 4, /* %m1 */
- 30 * 4, /* %m2 */
- 31 * 4, /* %m3 */
- 36 * 4, /* %b0 */
- 37 * 4, /* %b1 */
- 38 * 4, /* %b2 */
- 39 * 4, /* %b3 */
- 32 * 4, /* %l0 */
- 33 * 4, /* %l1 */
- 34 * 4, /* %l2 */
- 35 * 4, /* %l3 */
- 17 * 4, /* %a0x */
- 15 * 4, /* %a0w */
- 18 * 4, /* %a1x */
- 16 * 4, /* %a1w */
- 19 * 4, /* %astat */
- 20 * 4, /* %rets */
- 40 * 4, /* %lc0 */
- 42 * 4, /* %lt0 */
- 44 * 4, /* %lb0 */
- 41 * 4, /* %lc1 */
- 43 * 4, /* %lt1 */
- 45 * 4, /* %lb1 */
- -1, /* %cycles */
- -1, /* %cycles2 */
- -1, /* %usp */
- 46 * 4, /* %seqstat */
- -1, /* syscfg */
- 21 * 4, /* %reti */
- 22 * 4, /* %retx */
- -1, /* %retn */
- -1, /* %rete */
- 21 * 4, /* %pc */
- };
- /* Signal trampolines. */
- static void
- bfin_linux_sigframe_init (const struct tramp_frame *self,
- struct frame_info *this_frame,
- struct trad_frame_cache *this_cache,
- CORE_ADDR func)
- {
- CORE_ADDR sp = get_frame_sp (this_frame);
- CORE_ADDR pc = get_frame_pc (this_frame);
- CORE_ADDR sigcontext = sp + SIGCONTEXT_OFFSET;
- const int *reg_offset = bfin_linux_sigcontext_reg_offset;
- int i;
- for (i = 0; i < BFIN_NUM_REGS; i++)
- if (reg_offset[i] != -1)
- trad_frame_set_reg_addr (this_cache, i, sigcontext + reg_offset[i]);
- /* This would come after the LINK instruction in the ret_from_signal
- function, hence the frame id would be SP + 8. */
- trad_frame_set_id (this_cache, frame_id_build (sp + 8, pc));
- }
- static const struct tramp_frame bfin_linux_sigframe =
- {
- SIGTRAMP_FRAME,
- 4,
- {
- { 0x00ADE128, 0xffffffff }, /* P0 = __NR_rt_sigreturn; */
- { 0x00A0, 0xffff }, /* EXCPT 0; */
- { TRAMP_SENTINEL_INSN, ULONGEST_MAX },
- },
- bfin_linux_sigframe_init,
- };
- static LONGEST
- bfin_linux_get_syscall_number (struct gdbarch *gdbarch,
- thread_info *thread)
- {
- struct regcache *regcache = get_thread_regcache (thread);
- enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
- /* The content of a register. */
- gdb_byte buf[4];
- /* The result. */
- LONGEST ret;
- /* Getting the system call number from the register.
- When dealing with Blackfin architecture, this information
- is stored at %p0 register. */
- regcache->cooked_read (BFIN_P0_REGNUM, buf);
- ret = extract_signed_integer (buf, 4, byte_order);
- return ret;
- }
- static void
- bfin_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
- {
- linux_init_abi (info, gdbarch, 0);
- /* Set the sigtramp frame sniffer. */
- tramp_frame_prepend_unwinder (gdbarch, &bfin_linux_sigframe);
- /* Functions for 'catch syscall'. */
- set_xml_syscall_file_name (gdbarch, "syscalls/bfin-linux.xml");
- set_gdbarch_get_syscall_number (gdbarch,
- bfin_linux_get_syscall_number);
- }
- void _initialize_bfin_linux_tdep ();
- void
- _initialize_bfin_linux_tdep ()
- {
- gdbarch_register_osabi (bfd_arch_bfin, 0, GDB_OSABI_LINUX,
- bfin_linux_init_abi);
- }
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