1 /* Low level Alpha interface, for GDB when running native.
2 Copyright 1993, 1995, 1996, 1998 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
25 #include <sys/ptrace.h>
28 #include <alpha/ptrace.h>
30 #include <machine/reg.h>
34 /* Prototypes for local functions. */
36 static void fetch_osf_core_registers (char *, unsigned, int, CORE_ADDR);
37 static void fetch_elf_core_registers (char *, unsigned, int, CORE_ADDR);
39 /* Size of elements in jmpbuf */
41 #define JB_ELEMENT_SIZE 8
43 /* The definition for JB_PC in machine/reg.h is wrong.
44 And we can't get at the correct definition in setjmp.h as it is
45 not always available (eg. if _POSIX_SOURCE is defined which is the
46 default). As the defintion is unlikely to change (see comment
47 in <setjmp.h>, define the correct value here. */
52 /* Figure out where the longjmp will land.
53 We expect the first arg to be a pointer to the jmp_buf structure from which
54 we extract the pc (JB_PC) that we will land at. The pc is copied into PC.
55 This routine returns true on success. */
58 get_longjmp_target (CORE_ADDR *pc)
61 char raw_buffer[MAX_REGISTER_RAW_SIZE];
63 jb_addr = read_register (A0_REGNUM);
65 if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, raw_buffer,
69 *pc = extract_address (raw_buffer, sizeof (CORE_ADDR));
73 /* Extract the register values out of the core file and store
74 them where `read_register' will find them.
76 CORE_REG_SECT points to the register values themselves, read into memory.
77 CORE_REG_SIZE is the size of that area.
78 WHICH says which set of registers we are handling (0 = int, 2 = float
79 on machines where they are discontiguous).
80 REG_ADDR is the offset from u.u_ar0 to the register values relative to
81 core_reg_sect. This is used with old-fashioned core files to
82 locate the registers in a large upage-plus-stack ".reg" section.
83 Original upage address X is at location core_reg_sect+x+reg_addr.
87 fetch_osf_core_registers (char *core_reg_sect, unsigned core_reg_size,
88 int which, CORE_ADDR reg_addr)
94 /* Table to map a gdb regnum to an index in the core register section.
95 The floating point register values are garbage in OSF/1.2 core files. */
96 static int core_reg_mapping[NUM_REGS] =
98 #define EFL (EF_SIZE / 8)
99 EF_V0, EF_T0, EF_T1, EF_T2, EF_T3, EF_T4, EF_T5, EF_T6,
100 EF_T7, EF_S0, EF_S1, EF_S2, EF_S3, EF_S4, EF_S5, EF_S6,
101 EF_A0, EF_A1, EF_A2, EF_A3, EF_A4, EF_A5, EF_T8, EF_T9,
102 EF_T10, EF_T11, EF_RA, EF_T12, EF_AT, EF_GP, EF_SP, -1,
103 EFL + 0, EFL + 1, EFL + 2, EFL + 3, EFL + 4, EFL + 5, EFL + 6, EFL + 7,
104 EFL + 8, EFL + 9, EFL + 10, EFL + 11, EFL + 12, EFL + 13, EFL + 14, EFL + 15,
105 EFL + 16, EFL + 17, EFL + 18, EFL + 19, EFL + 20, EFL + 21, EFL + 22, EFL + 23,
106 EFL + 24, EFL + 25, EFL + 26, EFL + 27, EFL + 28, EFL + 29, EFL + 30, EFL + 31,
109 static char zerobuf[MAX_REGISTER_RAW_SIZE] =
112 for (regno = 0; regno < NUM_REGS; regno++)
114 if (CANNOT_FETCH_REGISTER (regno))
116 supply_register (regno, zerobuf);
119 addr = 8 * core_reg_mapping[regno];
120 if (addr < 0 || addr >= core_reg_size)
127 supply_register (regno, core_reg_sect + addr);
132 error ("Register %s not found in core file.", REGISTER_NAME (bad_reg));
137 fetch_elf_core_registers (char *core_reg_sect, unsigned core_reg_size,
138 int which, CORE_ADDR reg_addr)
140 if (core_reg_size < 32 * 8)
142 error ("Core file register section too small (%u bytes).", core_reg_size);
148 /* The FPU Registers. */
149 memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)], core_reg_sect, 31 * 8);
150 memset (®isters[REGISTER_BYTE (FP0_REGNUM + 31)], 0, 8);
151 memset (®ister_valid[FP0_REGNUM], 1, 32);
155 /* The General Registers. */
156 memcpy (®isters[REGISTER_BYTE (V0_REGNUM)], core_reg_sect, 31 * 8);
157 memcpy (®isters[REGISTER_BYTE (PC_REGNUM)], core_reg_sect + 31 * 8, 8);
158 memset (®isters[REGISTER_BYTE (ZERO_REGNUM)], 0, 8);
159 memset (®ister_valid[V0_REGNUM], 1, 32);
160 register_valid[PC_REGNUM] = 1;
165 /* Map gdb internal register number to a ptrace ``address''.
166 These ``addresses'' are defined in <sys/ptrace.h> */
168 #define REGISTER_PTRACE_ADDR(regno) \
169 (regno < FP0_REGNUM ? GPR_BASE + (regno) \
170 : regno == PC_REGNUM ? PC \
171 : regno >= FP0_REGNUM ? FPR_BASE + ((regno) - FP0_REGNUM) \
174 /* Return the ptrace ``address'' of register REGNO. */
177 register_addr (int regno, CORE_ADDR blockend)
179 return REGISTER_PTRACE_ADDR (regno);
185 return (sizeof (struct user));
188 #if defined(USE_PROC_FS) || defined(HAVE_GREGSET_T)
189 #include <sys/procfs.h>
191 /* Prototypes for supply_gregset etc. */
195 * See the comment in m68k-tdep.c regarding the utility of these functions.
199 supply_gregset (gregset_t *gregsetp)
202 register long *regp = ALPHA_REGSET_BASE (gregsetp);
203 static char zerobuf[MAX_REGISTER_RAW_SIZE] =
206 for (regi = 0; regi < 31; regi++)
207 supply_register (regi, (char *) (regp + regi));
209 supply_register (PC_REGNUM, (char *) (regp + 31));
211 /* Fill inaccessible registers with zero. */
212 supply_register (ZERO_REGNUM, zerobuf);
213 supply_register (FP_REGNUM, zerobuf);
217 fill_gregset (gregset_t *gregsetp, int regno)
220 register long *regp = ALPHA_REGSET_BASE (gregsetp);
222 for (regi = 0; regi < 31; regi++)
223 if ((regno == -1) || (regno == regi))
224 *(regp + regi) = *(long *) ®isters[REGISTER_BYTE (regi)];
226 if ((regno == -1) || (regno == PC_REGNUM))
227 *(regp + 31) = *(long *) ®isters[REGISTER_BYTE (PC_REGNUM)];
231 * Now we do the same thing for floating-point registers.
232 * Again, see the comments in m68k-tdep.c.
236 supply_fpregset (fpregset_t *fpregsetp)
239 register long *regp = ALPHA_REGSET_BASE (fpregsetp);
241 for (regi = 0; regi < 32; regi++)
242 supply_register (regi + FP0_REGNUM, (char *) (regp + regi));
246 fill_fpregset (fpregset_t *fpregsetp, int regno)
249 register long *regp = ALPHA_REGSET_BASE (fpregsetp);
251 for (regi = FP0_REGNUM; regi < FP0_REGNUM + 32; regi++)
253 if ((regno == -1) || (regno == regi))
255 *(regp + regi - FP0_REGNUM) =
256 *(long *) ®isters[REGISTER_BYTE (regi)];
263 /* Register that we are able to handle alpha core file formats. */
265 static struct core_fns alpha_osf_core_fns =
267 /* This really is bfd_target_unknown_flavour. */
269 bfd_target_unknown_flavour, /* core_flavour */
270 default_check_format, /* check_format */
271 default_core_sniffer, /* core_sniffer */
272 fetch_osf_core_registers, /* core_read_registers */
276 static struct core_fns alpha_elf_core_fns =
278 bfd_target_elf_flavour, /* core_flavour */
279 default_check_format, /* check_format */
280 default_core_sniffer, /* core_sniffer */
281 fetch_elf_core_registers, /* core_read_registers */
286 _initialize_core_alpha (void)
288 add_core_fns (&alpha_osf_core_fns);
289 add_core_fns (&alpha_elf_core_fns);