1 /* Target-dependent code for Analog Devices Blackfin processor, for GDB.
3 Copyright (C) 2005-2012 Free Software Foundation, Inc.
5 Contributed by Analog Devices, Inc.
7 This file is part of GDB.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>. */
23 #include "arch-utils.h"
25 #include "tramp-frame.h"
26 #include "trad-frame.h"
28 #include "xml-syscall.h"
29 #include "linux-tdep.h"
30 #include "bfin-tdep.h"
32 /* From <asm/sigcontext.h>. */
34 #define SIGCONTEXT_OFFSET 168
36 static const int bfin_linux_sigcontext_reg_offset[BFIN_NUM_REGS] =
85 46 * 4, /* %seqstat */
94 /* Signal trampolines. */
97 bfin_linux_sigframe_init (const struct tramp_frame *self,
98 struct frame_info *this_frame,
99 struct trad_frame_cache *this_cache,
102 struct gdbarch *gdbarch = get_frame_arch (this_frame);
103 CORE_ADDR sp = get_frame_sp (this_frame);
104 CORE_ADDR pc = get_frame_pc (this_frame);
105 CORE_ADDR sigcontext = sp + SIGCONTEXT_OFFSET;
106 struct frame_id this_id;
107 const int *reg_offset = bfin_linux_sigcontext_reg_offset;
110 for (i = 0; i < BFIN_NUM_REGS; i++)
111 if (reg_offset[i] != -1)
112 trad_frame_set_reg_addr (this_cache, i, sigcontext + reg_offset[i]);
114 /* This would come after the LINK instruction in the ret_from_signal
115 function, hence the frame id would be SP + 8. */
116 trad_frame_set_id (this_cache, frame_id_build (sp + 8, pc));
119 static const struct tramp_frame bfin_linux_sigframe =
124 { 0x00ADE128, 0xffffffff }, /* P0 = __NR_rt_sigreturn; */
125 { 0x00A0, 0xffff }, /* EXCPT 0; */
126 { TRAMP_SENTINEL_INSN, -1 },
128 bfin_linux_sigframe_init,
132 bfin_linux_get_syscall_number (struct gdbarch *gdbarch,
135 struct regcache *regcache = get_thread_regcache (ptid);
136 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
137 /* The content of a register. */
142 /* Getting the system call number from the register.
143 When dealing with Blackfin architecture, this information
144 is stored at %p0 register. */
145 regcache_cooked_read (regcache, BFIN_P0_REGNUM, buf);
147 ret = extract_signed_integer (buf, 4, byte_order);
153 bfin_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
155 linux_init_abi (info, gdbarch);
157 /* Set the sigtramp frame sniffer. */
158 tramp_frame_prepend_unwinder (gdbarch, &bfin_linux_sigframe);
160 /* Functions for 'catch syscall'. */
161 set_xml_syscall_file_name ("syscalls/bfin-linux.xml");
162 set_gdbarch_get_syscall_number (gdbarch,
163 bfin_linux_get_syscall_number);
166 /* Provide a prototype to silence -Wmissing-prototypes. */
167 extern initialize_file_ftype _initialize_bfin_linux_tdep;
170 _initialize_bfin_linux_tdep (void)
172 gdbarch_register_osabi (bfd_arch_bfin, 0, GDB_OSABI_LINUX,
173 bfin_linux_init_abi);