1 /* Target-dependent code for Motorola 68000 BSD's.
3 Copyright (C) 2004, 2005, 2007 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
21 #include "arch-utils.h"
26 #include "trad-frame.h"
27 #include "tramp-frame.h"
30 #include "gdb_assert.h"
31 #include "gdb_string.h"
33 #include "m68k-tdep.h"
34 #include "solib-svr4.h"
36 /* Core file support. */
38 /* Sizeof `struct reg' in <machine/reg.h>. */
39 #define M68KBSD_SIZEOF_GREGS (18 * 4)
41 /* Sizeof `struct fpreg' in <machine/reg.h. */
42 #define M68KBSD_SIZEOF_FPREGS (((8 * 3) + 3) * 4)
45 m68kbsd_fpreg_offset (int regnum)
47 int fp_len = TYPE_LENGTH (gdbarch_register_type (current_gdbarch, regnum));
49 if (regnum >= M68K_FPC_REGNUM)
50 return 8 * fp_len + (regnum - M68K_FPC_REGNUM) * 4;
52 return (regnum - M68K_FP0_REGNUM) * fp_len;
55 /* Supply register REGNUM from the buffer specified by FPREGS and LEN
56 in the floating-point register set REGSET to register cache
57 REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
60 m68kbsd_supply_fpregset (const struct regset *regset,
61 struct regcache *regcache,
62 int regnum, const void *fpregs, size_t len)
64 const gdb_byte *regs = fpregs;
67 gdb_assert (len >= M68KBSD_SIZEOF_FPREGS);
69 for (i = M68K_FP0_REGNUM; i <= M68K_PC_REGNUM; i++)
71 if (regnum == i || regnum == -1)
72 regcache_raw_supply (regcache, i, regs + m68kbsd_fpreg_offset (i));
76 /* Supply register REGNUM from the buffer specified by GREGS and LEN
77 in the general-purpose register set REGSET to register cache
78 REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
81 m68kbsd_supply_gregset (const struct regset *regset,
82 struct regcache *regcache,
83 int regnum, const void *gregs, size_t len)
85 const gdb_byte *regs = gregs;
88 gdb_assert (len >= M68KBSD_SIZEOF_GREGS);
90 for (i = M68K_D0_REGNUM; i <= M68K_PC_REGNUM; i++)
92 if (regnum == i || regnum == -1)
93 regcache_raw_supply (regcache, i, regs + i * 4);
96 if (len >= M68KBSD_SIZEOF_GREGS + M68KBSD_SIZEOF_FPREGS)
98 regs += M68KBSD_SIZEOF_GREGS;
99 len -= M68KBSD_SIZEOF_GREGS;
100 m68kbsd_supply_fpregset (regset, regcache, regnum, regs, len);
104 /* Motorola 68000 register sets. */
106 static struct regset m68kbsd_gregset =
109 m68kbsd_supply_gregset
112 static struct regset m68kbsd_fpregset =
115 m68kbsd_supply_fpregset
118 /* Return the appropriate register set for the core section identified
119 by SECT_NAME and SECT_SIZE. */
121 static const struct regset *
122 m68kbsd_regset_from_core_section (struct gdbarch *gdbarch,
123 const char *sect_name, size_t sect_size)
125 if (strcmp (sect_name, ".reg") == 0 && sect_size >= M68KBSD_SIZEOF_GREGS)
126 return &m68kbsd_gregset;
128 if (strcmp (sect_name, ".reg2") == 0 && sect_size >= M68KBSD_SIZEOF_FPREGS)
129 return &m68kbsd_fpregset;
135 /* Signal trampolines. */
138 m68kobsd_sigtramp_cache_init (const struct tramp_frame *self,
139 struct frame_info *next_frame,
140 struct trad_frame_cache *this_cache,
143 CORE_ADDR addr, base, pc;
146 base = frame_unwind_register_unsigned (next_frame, M68K_SP_REGNUM);
148 /* The 'addql #4,%sp' instruction at offset 8 adjusts the stack
149 pointer. Adjust the frame base accordingly. */
150 pc = frame_unwind_register_unsigned (next_frame, M68K_PC_REGNUM);
154 /* Get frame pointer, stack pointer, program counter and processor
155 state from `struct sigcontext'. */
156 addr = get_frame_memory_unsigned (next_frame, base + 8, 4);
157 trad_frame_set_reg_addr (this_cache, M68K_FP_REGNUM, addr + 8);
158 trad_frame_set_reg_addr (this_cache, M68K_SP_REGNUM, addr + 12);
159 trad_frame_set_reg_addr (this_cache, M68K_PC_REGNUM, addr + 20);
160 trad_frame_set_reg_addr (this_cache, M68K_PS_REGNUM, addr + 24);
162 /* The sc_ap member of `struct sigcontext' points to additional
163 hardware state. Here we find the missing registers. */
164 addr = get_frame_memory_unsigned (next_frame, addr + 16, 4) + 4;
165 for (regnum = M68K_D0_REGNUM; regnum < M68K_FP_REGNUM; regnum++, addr += 4)
166 trad_frame_set_reg_addr (this_cache, regnum, addr);
168 /* Construct the frame ID using the function start. */
169 trad_frame_set_id (this_cache, frame_id_build (base, func));
172 static const struct tramp_frame m68kobsd_sigtramp = {
176 { 0x206f, -1 }, { 0x000c, -1}, /* moveal %sp@(12),%a0 */
177 { 0x4e90, -1 }, /* jsr %a0@ */
178 { 0x588f, -1 }, /* addql #4,%sp */
179 { 0x4e41, -1 }, /* trap #1 */
180 { 0x2f40, -1 }, { 0x0004, -1 }, /* moveal %d0,%sp@(4) */
181 { 0x7001, -1 }, /* moveq #SYS_exit,%d0 */
182 { 0x4e40, -1 }, /* trap #0 */
183 { TRAMP_SENTINEL_INSN, -1 }
185 m68kobsd_sigtramp_cache_init
190 m68kbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
192 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
195 tdep->jb_elt_size = 4;
197 set_gdbarch_decr_pc_after_break (gdbarch, 2);
199 set_gdbarch_regset_from_core_section
200 (gdbarch, m68kbsd_regset_from_core_section);
203 /* OpenBSD and NetBSD a.out. */
206 m68kbsd_aout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
208 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
210 m68kbsd_init_abi (info, gdbarch);
212 tdep->struct_return = reg_struct_return;
214 tramp_frame_prepend_unwinder (gdbarch, &m68kobsd_sigtramp);
220 m68kbsd_elf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
222 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
224 m68kbsd_init_abi (info, gdbarch);
226 /* NetBSD ELF uses the SVR4 ABI. */
227 m68k_svr4_init_abi (info, gdbarch);
228 tdep->struct_return = pcc_struct_return;
230 /* NetBSD ELF uses SVR4-style shared libraries. */
231 set_solib_svr4_fetch_link_map_offsets
232 (gdbarch, svr4_ilp32_fetch_link_map_offsets);
236 static enum gdb_osabi
237 m68kbsd_aout_osabi_sniffer (bfd *abfd)
239 if (strcmp (bfd_get_target (abfd), "a.out-m68k-netbsd") == 0
240 || strcmp (bfd_get_target (abfd), "a.out-m68k4k-netbsd") == 0)
241 return GDB_OSABI_NETBSD_AOUT;
243 return GDB_OSABI_UNKNOWN;
246 static enum gdb_osabi
247 m68kbsd_core_osabi_sniffer (bfd *abfd)
249 if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
250 return GDB_OSABI_NETBSD_AOUT;
252 return GDB_OSABI_UNKNOWN;
256 /* Provide a prototype to silence -Wmissing-prototypes. */
257 void _initialize_m68kbsd_tdep (void);
260 _initialize_m68kbsd_tdep (void)
262 gdbarch_register_osabi_sniffer (bfd_arch_m68k, bfd_target_aout_flavour,
263 m68kbsd_aout_osabi_sniffer);
265 /* BFD doesn't set a flavour for NetBSD style a.out core files. */
266 gdbarch_register_osabi_sniffer (bfd_arch_m68k, bfd_target_unknown_flavour,
267 m68kbsd_core_osabi_sniffer);
269 gdbarch_register_osabi (bfd_arch_m68k, 0, GDB_OSABI_NETBSD_AOUT,
270 m68kbsd_aout_init_abi);
271 gdbarch_register_osabi (bfd_arch_m68k, 0, GDB_OSABI_NETBSD_ELF,
272 m68kbsd_elf_init_abi);