1 /* Low level Alpha interface, for GDB when running native.
2 Copyright 1993, 1995, 1996, 1998, 1999, 2000, 2001
3 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 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. */
27 #include <sys/ptrace.h>
30 #include <alpha/ptrace.h>
32 #include <machine/reg.h>
36 /* Prototypes for local functions. */
38 static void fetch_osf_core_registers (char *, unsigned, int, CORE_ADDR
);
39 static void fetch_elf_core_registers (char *, unsigned, int, CORE_ADDR
);
41 /* Size of elements in jmpbuf */
43 #define JB_ELEMENT_SIZE 8
45 /* The definition for JB_PC in machine/reg.h is wrong.
46 And we can't get at the correct definition in setjmp.h as it is
47 not always available (eg. if _POSIX_SOURCE is defined which is the
48 default). As the defintion is unlikely to change (see comment
49 in <setjmp.h>, define the correct value here. */
54 /* Figure out where the longjmp will land.
55 We expect the first arg to be a pointer to the jmp_buf structure from which
56 we extract the pc (JB_PC) that we will land at. The pc is copied into PC.
57 This routine returns true on success. */
60 get_longjmp_target (CORE_ADDR
*pc
)
63 char raw_buffer
[MAX_REGISTER_RAW_SIZE
];
65 jb_addr
= read_register (A0_REGNUM
);
67 if (target_read_memory (jb_addr
+ JB_PC
* JB_ELEMENT_SIZE
, raw_buffer
,
71 *pc
= extract_address (raw_buffer
, sizeof (CORE_ADDR
));
75 /* Extract the register values out of the core file and store
76 them where `read_register' will find them.
78 CORE_REG_SECT points to the register values themselves, read into memory.
79 CORE_REG_SIZE is the size of that area.
80 WHICH says which set of registers we are handling (0 = int, 2 = float
81 on machines where they are discontiguous).
82 REG_ADDR is the offset from u.u_ar0 to the register values relative to
83 core_reg_sect. This is used with old-fashioned core files to
84 locate the registers in a large upage-plus-stack ".reg" section.
85 Original upage address X is at location core_reg_sect+x+reg_addr.
89 fetch_osf_core_registers (char *core_reg_sect
, unsigned core_reg_size
,
90 int which
, CORE_ADDR reg_addr
)
96 /* Table to map a gdb regnum to an index in the core register section.
97 The floating point register values are garbage in OSF/1.2 core files. */
98 static int core_reg_mapping
[NUM_REGS
] =
100 #define EFL (EF_SIZE / 8)
101 EF_V0
, EF_T0
, EF_T1
, EF_T2
, EF_T3
, EF_T4
, EF_T5
, EF_T6
,
102 EF_T7
, EF_S0
, EF_S1
, EF_S2
, EF_S3
, EF_S4
, EF_S5
, EF_S6
,
103 EF_A0
, EF_A1
, EF_A2
, EF_A3
, EF_A4
, EF_A5
, EF_T8
, EF_T9
,
104 EF_T10
, EF_T11
, EF_RA
, EF_T12
, EF_AT
, EF_GP
, EF_SP
, -1,
105 EFL
+ 0, EFL
+ 1, EFL
+ 2, EFL
+ 3, EFL
+ 4, EFL
+ 5, EFL
+ 6, EFL
+ 7,
106 EFL
+ 8, EFL
+ 9, EFL
+ 10, EFL
+ 11, EFL
+ 12, EFL
+ 13, EFL
+ 14, EFL
+ 15,
107 EFL
+ 16, EFL
+ 17, EFL
+ 18, EFL
+ 19, EFL
+ 20, EFL
+ 21, EFL
+ 22, EFL
+ 23,
108 EFL
+ 24, EFL
+ 25, EFL
+ 26, EFL
+ 27, EFL
+ 28, EFL
+ 29, EFL
+ 30, EFL
+ 31,
111 static char zerobuf
[MAX_REGISTER_RAW_SIZE
] =
114 for (regno
= 0; regno
< NUM_REGS
; regno
++)
116 if (CANNOT_FETCH_REGISTER (regno
))
118 supply_register (regno
, zerobuf
);
121 addr
= 8 * core_reg_mapping
[regno
];
122 if (addr
< 0 || addr
>= core_reg_size
)
129 supply_register (regno
, core_reg_sect
+ addr
);
134 error ("Register %s not found in core file.", REGISTER_NAME (bad_reg
));
139 fetch_elf_core_registers (char *core_reg_sect
, unsigned core_reg_size
,
140 int which
, CORE_ADDR reg_addr
)
142 if (core_reg_size
< 32 * 8)
144 error ("Core file register section too small (%u bytes).", core_reg_size
);
150 /* The FPU Registers. */
151 memcpy (®isters
[REGISTER_BYTE (FP0_REGNUM
)], core_reg_sect
, 31 * 8);
152 memset (®isters
[REGISTER_BYTE (FP0_REGNUM
+ 31)], 0, 8);
153 memset (®ister_valid
[FP0_REGNUM
], 1, 32);
157 /* The General Registers. */
158 memcpy (®isters
[REGISTER_BYTE (V0_REGNUM
)], core_reg_sect
, 31 * 8);
159 memcpy (®isters
[REGISTER_BYTE (PC_REGNUM
)], core_reg_sect
+ 31 * 8, 8);
160 memset (®isters
[REGISTER_BYTE (ZERO_REGNUM
)], 0, 8);
161 memset (®ister_valid
[V0_REGNUM
], 1, 32);
162 register_valid
[PC_REGNUM
] = 1;
167 /* Map gdb internal register number to a ptrace ``address''.
168 These ``addresses'' are defined in <sys/ptrace.h> */
170 #define REGISTER_PTRACE_ADDR(regno) \
171 (regno < FP0_REGNUM ? GPR_BASE + (regno) \
172 : regno == PC_REGNUM ? PC \
173 : regno >= FP0_REGNUM ? FPR_BASE + ((regno) - FP0_REGNUM) \
176 /* Return the ptrace ``address'' of register REGNO. */
179 register_addr (int regno
, CORE_ADDR blockend
)
181 return REGISTER_PTRACE_ADDR (regno
);
187 return (sizeof (struct user
));
190 #if defined(USE_PROC_FS) || defined(HAVE_GREGSET_T)
191 #include <sys/procfs.h>
193 /* Prototypes for supply_gregset etc. */
197 * See the comment in m68k-tdep.c regarding the utility of these functions.
201 supply_gregset (gdb_gregset_t
*gregsetp
)
204 register long *regp
= ALPHA_REGSET_BASE (gregsetp
);
205 static char zerobuf
[MAX_REGISTER_RAW_SIZE
] =
208 for (regi
= 0; regi
< 31; regi
++)
209 supply_register (regi
, (char *) (regp
+ regi
));
211 supply_register (PC_REGNUM
, (char *) (regp
+ 31));
213 /* Fill inaccessible registers with zero. */
214 supply_register (ZERO_REGNUM
, zerobuf
);
215 supply_register (FP_REGNUM
, zerobuf
);
219 fill_gregset (gdb_gregset_t
*gregsetp
, int regno
)
222 register long *regp
= ALPHA_REGSET_BASE (gregsetp
);
224 for (regi
= 0; regi
< 31; regi
++)
225 if ((regno
== -1) || (regno
== regi
))
226 *(regp
+ regi
) = *(long *) ®isters
[REGISTER_BYTE (regi
)];
228 if ((regno
== -1) || (regno
== PC_REGNUM
))
229 *(regp
+ 31) = *(long *) ®isters
[REGISTER_BYTE (PC_REGNUM
)];
233 * Now we do the same thing for floating-point registers.
234 * Again, see the comments in m68k-tdep.c.
238 supply_fpregset (gdb_fpregset_t
*fpregsetp
)
241 register long *regp
= ALPHA_REGSET_BASE (fpregsetp
);
243 for (regi
= 0; regi
< 32; regi
++)
244 supply_register (regi
+ FP0_REGNUM
, (char *) (regp
+ regi
));
248 fill_fpregset (gdb_fpregset_t
*fpregsetp
, int regno
)
251 register long *regp
= ALPHA_REGSET_BASE (fpregsetp
);
253 for (regi
= FP0_REGNUM
; regi
< FP0_REGNUM
+ 32; regi
++)
255 if ((regno
== -1) || (regno
== regi
))
257 *(regp
+ regi
- FP0_REGNUM
) =
258 *(long *) ®isters
[REGISTER_BYTE (regi
)];
265 /* Register that we are able to handle alpha core file formats. */
267 static struct core_fns alpha_osf_core_fns
=
269 /* This really is bfd_target_unknown_flavour. */
271 bfd_target_unknown_flavour
, /* core_flavour */
272 default_check_format
, /* check_format */
273 default_core_sniffer
, /* core_sniffer */
274 fetch_osf_core_registers
, /* core_read_registers */
278 static struct core_fns alpha_elf_core_fns
=
280 bfd_target_elf_flavour
, /* core_flavour */
281 default_check_format
, /* check_format */
282 default_core_sniffer
, /* core_sniffer */
283 fetch_elf_core_registers
, /* core_read_registers */
288 _initialize_core_alpha (void)
290 add_core_fns (&alpha_osf_core_fns
);
291 add_core_fns (&alpha_elf_core_fns
);