1 /* Target-dependent code for Analog Devices Blackfin processor, for GDB.
3 Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011
4 Free Software Foundation, Inc.
6 Contributed by Analog Devices, Inc.
8 This file is part of GDB.
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>. */
24 #include "arch-utils.h"
26 #include "tramp-frame.h"
27 #include "trad-frame.h"
29 #include "xml-syscall.h"
30 #include "linux-tdep.h"
31 #include "bfin-tdep.h"
33 /* From <asm/sigcontext.h>. */
35 #define SIGCONTEXT_OFFSET 168
37 static const int bfin_linux_sigcontext_reg_offset[BFIN_NUM_REGS] =
86 46 * 4, /* %seqstat */
95 /* Signal trampolines. */
98 bfin_linux_sigframe_init (const struct tramp_frame *self,
99 struct frame_info *this_frame,
100 struct trad_frame_cache *this_cache,
103 struct gdbarch *gdbarch = get_frame_arch (this_frame);
104 CORE_ADDR sp = get_frame_sp (this_frame);
105 CORE_ADDR pc = get_frame_pc (this_frame);
106 CORE_ADDR sigcontext = sp + SIGCONTEXT_OFFSET;
107 struct frame_id this_id;
108 const int *reg_offset = bfin_linux_sigcontext_reg_offset;
111 for (i = 0; i < BFIN_NUM_REGS; i++)
112 if (reg_offset[i] != -1)
113 trad_frame_set_reg_addr (this_cache, i, sigcontext + reg_offset[i]);
115 /* This would come after the LINK instruction in the ret_from_signal
116 function, hence the frame id would be SP + 8. */
117 trad_frame_set_id (this_cache, frame_id_build (sp + 8, pc));
120 static const struct tramp_frame bfin_linux_sigframe =
125 { 0x00ADE128, 0xffffffff }, /* P0 = __NR_rt_sigreturn; */
126 { 0x00A0, 0xffff }, /* EXCPT 0; */
127 { TRAMP_SENTINEL_INSN, -1 },
129 bfin_linux_sigframe_init,
133 bfin_linux_get_syscall_number (struct gdbarch *gdbarch,
136 struct regcache *regcache = get_thread_regcache (ptid);
137 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
138 /* The content of a register. */
143 /* Getting the system call number from the register.
144 When dealing with Blackfin architecture, this information
145 is stored at %p0 register. */
146 regcache_cooked_read (regcache, BFIN_P0_REGNUM, buf);
148 ret = extract_signed_integer (buf, 4, byte_order);
154 bfin_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
156 linux_init_abi (info, gdbarch);
158 /* Set the sigtramp frame sniffer. */
159 tramp_frame_prepend_unwinder (gdbarch, &bfin_linux_sigframe);
161 /* Functions for 'catch syscall'. */
162 set_xml_syscall_file_name ("syscalls/bfin-linux.xml");
163 set_gdbarch_get_syscall_number (gdbarch,
164 bfin_linux_get_syscall_number);
167 /* Provide a prototype to silence -Wmissing-prototypes. */
168 extern initialize_file_ftype _initialize_bfin_linux_tdep;
171 _initialize_bfin_linux_tdep (void)
173 gdbarch_register_osabi (bfd_arch_bfin, 0, GDB_OSABI_LINUX,
174 bfin_linux_init_abi);