1 /* Target-dependent code for NetBSD/Alpha.
2 Copyright 2002 Free Software Foundation, Inc.
3 Contributed by Wasabi Systems, 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 2 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, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
28 #include "solib-svr4.h"
30 #include "alpha-tdep.h"
31 #include "alphabsd-tdep.h"
32 #include "nbsd-tdep.h"
35 fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which,
41 /* Table to map a gdb register number to a trapframe register index. */
42 static const int regmap[] =
53 #define SIZEOF_TRAPFRAME (33 * 8)
55 /* We get everything from one section. */
60 fpregs = core_reg_sect + SIZEOF_TRAPFRAME;
62 if (core_reg_size < (SIZEOF_TRAPFRAME + SIZEOF_STRUCT_FPREG))
64 warning ("Wrong size register set in core file.");
68 /* Integer registers. */
69 for (regno = 0; regno < ALPHA_ZERO_REGNUM; regno++)
70 supply_register (regno, regs + (regmap[regno] * 8));
71 supply_register (ALPHA_ZERO_REGNUM, NULL);
72 supply_register (FP_REGNUM, NULL);
73 supply_register (PC_REGNUM, regs + (28 * 8));
75 /* Floating point registers. */
76 alphabsd_supply_fpreg (fpregs, -1);
80 fetch_elfcore_registers (char *core_reg_sect, unsigned core_reg_size, int which,
85 case 0: /* Integer registers. */
86 if (core_reg_size != SIZEOF_STRUCT_REG)
87 warning ("Wrong size register set in core file.");
89 alphabsd_supply_reg (core_reg_sect, -1);
92 case 2: /* Floating point registers. */
93 if (core_reg_size != SIZEOF_STRUCT_FPREG)
94 warning ("Wrong size FP register set in core file.");
96 alphabsd_supply_fpreg (core_reg_sect, -1);
100 /* Don't know what kind of register request this is; just ignore it. */
105 static struct core_fns alphanbsd_core_fns =
107 bfd_target_unknown_flavour, /* core_flavour */
108 default_check_format, /* check_format */
109 default_core_sniffer, /* core_sniffer */
110 fetch_core_registers, /* core_read_registers */
114 static struct core_fns alphanbsd_elfcore_fns =
116 bfd_target_elf_flavour, /* core_flavour */
117 default_check_format, /* check_format */
118 default_core_sniffer, /* core_sniffer */
119 fetch_elfcore_registers, /* core_read_registers */
123 /* Under NetBSD/alpha, signal handler invocations can be identified by the
124 designated code sequence that is used to return from a signal handler.
125 In particular, the return address of a signal handler points to the
126 following code sequence:
130 lda v0, 295(zero) # __sigreturn14
133 Each instruction has a unique encoding, so we simply attempt to match
134 the instruction the PC is pointing to with any of the above instructions.
135 If there is a hit, we know the offset to the start of the designated
136 sequence and can then check whether we really are executing in the
137 signal trampoline. If not, -1 is returned, otherwise the offset from the
138 start of the return sequence is returned. */
139 static const unsigned char sigtramp_retcode[] =
141 0x00, 0x00, 0x1e, 0xa6, /* ldq a0, 0(sp) */
142 0x10, 0x00, 0xde, 0x23, /* lda sp, 16(sp) */
143 0x27, 0x01, 0x1f, 0x20, /* lda v0, 295(zero) */
144 0x83, 0x00, 0x00, 0x00, /* call_pal callsys */
146 #define RETCODE_NWORDS 4
147 #define RETCODE_SIZE (RETCODE_NWORDS * 4)
150 alphanbsd_sigtramp_offset (CORE_ADDR pc)
152 unsigned char ret[RETCODE_SIZE], w[4];
156 if (read_memory_nobpt (pc, (char *) w, 4) != 0)
159 for (i = 0; i < RETCODE_NWORDS; i++)
161 if (memcmp (w, sigtramp_retcode + (i * 4), 4) == 0)
164 if (i == RETCODE_NWORDS)
170 if (read_memory_nobpt (pc, (char *) ret, sizeof (ret)) != 0)
173 if (memcmp (ret, sigtramp_retcode, RETCODE_SIZE) == 0)
180 alphanbsd_pc_in_sigtramp (CORE_ADDR pc, char *func_name)
182 return (nbsd_pc_in_sigtramp (pc, func_name)
183 || alphanbsd_sigtramp_offset (pc) >= 0);
187 alphanbsd_sigcontext_addr (struct frame_info *frame)
189 /* FIXME: This is not correct for all versions of NetBSD/alpha.
190 We will probably need to disassemble the trampoline to figure
191 out which trampoline frame type we have. */
196 alphanbsd_skip_sigtramp_frame (struct frame_info *frame, CORE_ADDR pc)
200 /* FIXME: This is not correct for all versions of NetBSD/alpha.
201 We will probably need to disassemble the trampoline to figure
202 out which trampoline frame type we have. */
203 find_pc_partial_function (pc, &name, (CORE_ADDR *) NULL, (CORE_ADDR *) NULL);
204 if (PC_IN_SIGTRAMP (pc, name))
210 alphanbsd_init_abi (struct gdbarch_info info,
211 struct gdbarch *gdbarch)
213 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
215 set_gdbarch_pc_in_sigtramp (gdbarch, alphanbsd_pc_in_sigtramp);
217 /* NetBSD/alpha does not provide single step support via ptrace(2); we
218 must use software single-stepping. */
219 set_gdbarch_software_single_step (gdbarch, alpha_software_single_step);
221 set_solib_svr4_fetch_link_map_offsets (gdbarch,
222 nbsd_lp64_solib_svr4_fetch_link_map_offsets);
224 tdep->skip_sigtramp_frame = alphanbsd_skip_sigtramp_frame;
225 tdep->dynamic_sigtramp_offset = alphanbsd_sigtramp_offset;
226 tdep->sigcontext_addr = alphanbsd_sigcontext_addr;
229 tdep->jb_elt_size = 8;
233 _initialize_alphanbsd_tdep (void)
235 gdbarch_register_osabi (bfd_arch_alpha, 0, GDB_OSABI_NETBSD_ELF,
238 add_core_fns (&alphanbsd_core_fns);
239 add_core_fns (&alphanbsd_elfcore_fns);