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 (pc)
62 char raw_buffer[MAX_REGISTER_RAW_SIZE];
64 jb_addr = read_register (A0_REGNUM);
66 if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, raw_buffer,
70 *pc = extract_address (raw_buffer, sizeof (CORE_ADDR));
74 /* Extract the register values out of the core file and store
75 them where `read_register' will find them.
77 CORE_REG_SECT points to the register values themselves, read into memory.
78 CORE_REG_SIZE is the size of that area.
79 WHICH says which set of registers we are handling (0 = int, 2 = float
80 on machines where they are discontiguous).
81 REG_ADDR is the offset from u.u_ar0 to the register values relative to
82 core_reg_sect. This is used with old-fashioned core files to
83 locate the registers in a large upage-plus-stack ".reg" section.
84 Original upage address X is at location core_reg_sect+x+reg_addr.
88 fetch_osf_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
90 unsigned core_reg_size;
98 /* Table to map a gdb regnum to an index in the core register section.
99 The floating point register values are garbage in OSF/1.2 core files. */
100 static int core_reg_mapping[NUM_REGS] =
102 #define EFL (EF_SIZE / 8)
103 EF_V0, EF_T0, EF_T1, EF_T2, EF_T3, EF_T4, EF_T5, EF_T6,
104 EF_T7, EF_S0, EF_S1, EF_S2, EF_S3, EF_S4, EF_S5, EF_S6,
105 EF_A0, EF_A1, EF_A2, EF_A3, EF_A4, EF_A5, EF_T8, EF_T9,
106 EF_T10, EF_T11, EF_RA, EF_T12, EF_AT, EF_GP, EF_SP, -1,
107 EFL + 0, EFL + 1, EFL + 2, EFL + 3, EFL + 4, EFL + 5, EFL + 6, EFL + 7,
108 EFL + 8, EFL + 9, EFL + 10, EFL + 11, EFL + 12, EFL + 13, EFL + 14, EFL + 15,
109 EFL + 16, EFL + 17, EFL + 18, EFL + 19, EFL + 20, EFL + 21, EFL + 22, EFL + 23,
110 EFL + 24, EFL + 25, EFL + 26, EFL + 27, EFL + 28, EFL + 29, EFL + 30, EFL + 31,
113 static char zerobuf[MAX_REGISTER_RAW_SIZE] =
116 for (regno = 0; regno < NUM_REGS; regno++)
118 if (CANNOT_FETCH_REGISTER (regno))
120 supply_register (regno, zerobuf);
123 addr = 8 * core_reg_mapping[regno];
124 if (addr < 0 || addr >= core_reg_size)
131 supply_register (regno, core_reg_sect + addr);
136 error ("Register %s not found in core file.", REGISTER_NAME (bad_reg));
141 fetch_elf_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
143 unsigned core_reg_size;
147 if (core_reg_size < 32 * 8)
149 error ("Core file register section too small (%u bytes).", core_reg_size);
155 /* The FPU Registers. */
156 memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)], core_reg_sect, 31 * 8);
157 memset (®isters[REGISTER_BYTE (FP0_REGNUM + 31)], 0, 8);
158 memset (®ister_valid[FP0_REGNUM], 1, 32);
162 /* The General Registers. */
163 memcpy (®isters[REGISTER_BYTE (V0_REGNUM)], core_reg_sect, 31 * 8);
164 memcpy (®isters[REGISTER_BYTE (PC_REGNUM)], core_reg_sect + 31 * 8, 8);
165 memset (®isters[REGISTER_BYTE (ZERO_REGNUM)], 0, 8);
166 memset (®ister_valid[V0_REGNUM], 1, 32);
167 register_valid[PC_REGNUM] = 1;
172 /* Map gdb internal register number to a ptrace ``address''.
173 These ``addresses'' are defined in <sys/ptrace.h> */
175 #define REGISTER_PTRACE_ADDR(regno) \
176 (regno < FP0_REGNUM ? GPR_BASE + (regno) \
177 : regno == PC_REGNUM ? PC \
178 : regno >= FP0_REGNUM ? FPR_BASE + ((regno) - FP0_REGNUM) \
181 /* Return the ptrace ``address'' of register REGNO. */
184 register_addr (regno, blockend)
188 return REGISTER_PTRACE_ADDR (regno);
194 return (sizeof (struct user));
197 #if defined(USE_PROC_FS) || defined(HAVE_GREGSET_T)
198 #include <sys/procfs.h>
200 /* Prototypes for supply_gregset etc. */
204 * See the comment in m68k-tdep.c regarding the utility of these functions.
208 supply_gregset (gregsetp)
212 register long *regp = ALPHA_REGSET_BASE (gregsetp);
213 static char zerobuf[MAX_REGISTER_RAW_SIZE] =
216 for (regi = 0; regi < 31; regi++)
217 supply_register (regi, (char *) (regp + regi));
219 supply_register (PC_REGNUM, (char *) (regp + 31));
221 /* Fill inaccessible registers with zero. */
222 supply_register (ZERO_REGNUM, zerobuf);
223 supply_register (FP_REGNUM, zerobuf);
227 fill_gregset (gregsetp, regno)
232 register long *regp = ALPHA_REGSET_BASE (gregsetp);
234 for (regi = 0; regi < 31; regi++)
235 if ((regno == -1) || (regno == regi))
236 *(regp + regi) = *(long *) ®isters[REGISTER_BYTE (regi)];
238 if ((regno == -1) || (regno == PC_REGNUM))
239 *(regp + 31) = *(long *) ®isters[REGISTER_BYTE (PC_REGNUM)];
243 * Now we do the same thing for floating-point registers.
244 * Again, see the comments in m68k-tdep.c.
248 supply_fpregset (fpregsetp)
249 fpregset_t *fpregsetp;
252 register long *regp = ALPHA_REGSET_BASE (fpregsetp);
254 for (regi = 0; regi < 32; regi++)
255 supply_register (regi + FP0_REGNUM, (char *) (regp + regi));
259 fill_fpregset (fpregsetp, regno)
260 fpregset_t *fpregsetp;
264 register long *regp = ALPHA_REGSET_BASE (fpregsetp);
266 for (regi = FP0_REGNUM; regi < FP0_REGNUM + 32; regi++)
268 if ((regno == -1) || (regno == regi))
270 *(regp + regi - FP0_REGNUM) =
271 *(long *) ®isters[REGISTER_BYTE (regi)];
278 /* Register that we are able to handle alpha core file formats. */
280 static struct core_fns alpha_osf_core_fns =
282 /* This really is bfd_target_unknown_flavour. */
284 bfd_target_unknown_flavour, /* core_flavour */
285 default_check_format, /* check_format */
286 default_core_sniffer, /* core_sniffer */
287 fetch_osf_core_registers, /* core_read_registers */
291 static struct core_fns alpha_elf_core_fns =
293 bfd_target_elf_flavour, /* core_flavour */
294 default_check_format, /* check_format */
295 default_core_sniffer, /* core_sniffer */
296 fetch_elf_core_registers, /* core_read_registers */
301 _initialize_core_alpha ()
303 add_core_fns (&alpha_osf_core_fns);
304 add_core_fns (&alpha_elf_core_fns);