1 /* Target-dependent code for GNU/Linux on MIPS processors.
2 Copyright 2001 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. */
24 #include "solib-svr4.h"
26 /* Copied from <asm/elf.h>. */
30 typedef unsigned char elf_greg_t
[4];
31 typedef elf_greg_t elf_gregset_t
[ELF_NGREG
];
33 typedef unsigned char elf_fpreg_t
[8];
34 typedef elf_fpreg_t elf_fpregset_t
[ELF_NFPREG
];
36 /* 0 - 31 are integer registers, 32 - 63 are fp registers. */
51 #define EF_CP0_BADVADDR 41
52 #define EF_CP0_STATUS 42
53 #define EF_CP0_CAUSE 43
57 /* Figure out where the longjmp will land.
58 We expect the first arg to be a pointer to the jmp_buf structure from
59 which we extract the pc (JB_PC) that we will land at. The pc is copied
60 into PC. This routine returns 1 on success. */
63 mips_linux_get_longjmp_target (CORE_ADDR
*pc
)
66 char buf
[TARGET_PTR_BIT
/ TARGET_CHAR_BIT
];
68 jb_addr
= read_register (A0_REGNUM
);
70 if (target_read_memory (jb_addr
+ JB_PC
* JB_ELEMENT_SIZE
, buf
,
71 TARGET_PTR_BIT
/ TARGET_CHAR_BIT
))
74 *pc
= extract_address (buf
, TARGET_PTR_BIT
/ TARGET_CHAR_BIT
);
79 /* Unpack an elf_gregset_t into GDB's register cache. */
82 supply_gregset (elf_gregset_t
*gregsetp
)
85 elf_greg_t
*regp
= *gregsetp
;
86 static char zerobuf
[MAX_REGISTER_RAW_SIZE
] = {0};
88 for (regi
= EF_REG0
; regi
<= EF_REG31
; regi
++)
89 supply_register ((regi
- EF_REG0
), (char *)(regp
+ regi
));
91 supply_register (LO_REGNUM
, (char *)(regp
+ EF_LO
));
92 supply_register (HI_REGNUM
, (char *)(regp
+ EF_HI
));
94 supply_register (PC_REGNUM
, (char *)(regp
+ EF_CP0_EPC
));
95 supply_register (BADVADDR_REGNUM
, (char *)(regp
+ EF_CP0_BADVADDR
));
96 supply_register (PS_REGNUM
, (char *)(regp
+ EF_CP0_STATUS
));
97 supply_register (CAUSE_REGNUM
, (char *)(regp
+ EF_CP0_CAUSE
));
99 /* Fill inaccessible registers with zero. */
100 supply_register (FP_REGNUM
, zerobuf
);
101 supply_register (UNUSED_REGNUM
, zerobuf
);
102 for (regi
= FIRST_EMBED_REGNUM
; regi
< LAST_EMBED_REGNUM
; regi
++)
103 supply_register (regi
, zerobuf
);
106 /* Pack our registers (or one register) into an elf_gregset_t. */
109 fill_gregset (elf_gregset_t
*gregsetp
, int regno
)
112 elf_greg_t
*regp
= *gregsetp
;
117 memset (regp
, 0, sizeof (elf_gregset_t
));
118 for (regi
= 0; regi
< 32; regi
++)
119 fill_gregset (gregsetp
, regi
);
120 fill_gregset (gregsetp
, LO_REGNUM
);
121 fill_gregset (gregsetp
, HI_REGNUM
);
122 fill_gregset (gregsetp
, PC_REGNUM
);
123 fill_gregset (gregsetp
, BADVADDR_REGNUM
);
124 fill_gregset (gregsetp
, PS_REGNUM
);
125 fill_gregset (gregsetp
, CAUSE_REGNUM
);
132 src
= ®isters
[REGISTER_BYTE (regno
)];
133 dst
= regp
+ regno
+ EF_REG0
;
134 memcpy (dst
, src
, sizeof (elf_greg_t
));
148 regaddr
= EF_CP0_EPC
;
150 case BADVADDR_REGNUM
:
151 regaddr
= EF_CP0_BADVADDR
;
154 regaddr
= EF_CP0_STATUS
;
157 regaddr
= EF_CP0_CAUSE
;
163 src
= ®isters
[REGISTER_BYTE (regno
)];
164 dst
= regp
+ regaddr
;
165 memcpy (dst
, src
, sizeof (elf_greg_t
));
169 /* Likewise, unpack an elf_fpregset_t. */
172 supply_fpregset (elf_fpregset_t
*fpregsetp
)
175 static char zerobuf
[MAX_REGISTER_RAW_SIZE
] = {0};
177 for (regi
= 0; regi
< 32; regi
++)
178 supply_register (FP0_REGNUM
+ regi
,
179 (char *)(*fpregsetp
+ regi
));
181 supply_register (FCRCS_REGNUM
, (char *)(*fpregsetp
+ 32));
183 /* FIXME: how can we supply FCRIR_REGNUM? The ABI doesn't tell us. */
184 supply_register (FCRIR_REGNUM
, zerobuf
);
187 /* Likewise, pack one or all floating point registers into an
191 fill_fpregset (elf_fpregset_t
*fpregsetp
, int regno
)
195 if ((regno
>= FP0_REGNUM
) && (regno
< FP0_REGNUM
+ 32))
197 from
= (char *) ®isters
[REGISTER_BYTE (regno
)];
198 to
= (char *) (*fpregsetp
+ regno
- FP0_REGNUM
);
199 memcpy (to
, from
, REGISTER_RAW_SIZE (regno
- FP0_REGNUM
));
201 else if (regno
== FCRCS_REGNUM
)
203 from
= (char *) ®isters
[REGISTER_BYTE (regno
)];
204 to
= (char *) (*fpregsetp
+ 32);
205 memcpy (to
, from
, REGISTER_RAW_SIZE (regno
));
207 else if (regno
== -1)
211 for (regi
= 0; regi
< 32; regi
++)
212 fill_fpregset (fpregsetp
, FP0_REGNUM
+ regi
);
213 fill_fpregset(fpregsetp
, FCRCS_REGNUM
);
217 /* Map gdb internal register number to ptrace ``address''.
218 These ``addresses'' are normally defined in <asm/ptrace.h>. */
221 register_addr (int regno
, CORE_ADDR blockend
)
225 if (regno
< 0 || regno
>= NUM_REGS
)
226 error ("Bogon register number %d.", regno
);
230 else if ((regno
>= FP0_REGNUM
) && (regno
< FP0_REGNUM
+ 32))
231 regaddr
= FPR_BASE
+ (regno
- FP0_REGNUM
);
232 else if (regno
== PC_REGNUM
)
234 else if (regno
== CAUSE_REGNUM
)
236 else if (regno
== BADVADDR_REGNUM
)
238 else if (regno
== LO_REGNUM
)
240 else if (regno
== HI_REGNUM
)
242 else if (regno
== FCRCS_REGNUM
)
244 else if (regno
== FCRIR_REGNUM
)
247 error ("Unknowable register number %d.", regno
);
252 /* Use a local version of this function to get the correct types for
253 regsets, until multi-arch core support is ready. */
256 fetch_core_registers (char *core_reg_sect
, unsigned core_reg_size
,
257 int which
, CORE_ADDR reg_addr
)
259 elf_gregset_t gregset
;
260 elf_fpregset_t fpregset
;
264 if (core_reg_size
!= sizeof (gregset
))
266 warning ("wrong size gregset struct in core file");
270 memcpy ((char *) &gregset
, core_reg_sect
, sizeof (gregset
));
271 supply_gregset (&gregset
);
276 if (core_reg_size
!= sizeof (fpregset
))
278 warning ("wrong size fpregset struct in core file");
282 memcpy ((char *) &fpregset
, core_reg_sect
, sizeof (fpregset
));
283 supply_fpregset (&fpregset
);
288 /* Register that we are able to handle ELF file formats using standard
289 procfs "regset" structures. */
291 static struct core_fns regset_core_fns
=
293 bfd_target_elf_flavour
, /* core_flavour */
294 default_check_format
, /* check_format */
295 default_core_sniffer
, /* core_sniffer */
296 fetch_core_registers
, /* core_read_registers */
300 /* Fetch (and possibly build) an appropriate link_map_offsets
301 structure for native GNU/Linux MIPS targets using the struct offsets
302 defined in link.h (but without actual reference to that file).
304 This makes it possible to access GNU/Linux MIPS shared libraries from a
305 GDB that was built on a different host platform (for cross debugging). */
307 struct link_map_offsets
*
308 mips_linux_svr4_fetch_link_map_offsets (void)
310 static struct link_map_offsets lmo
;
311 static struct link_map_offsets
*lmp
= NULL
;
317 lmo
.r_debug_size
= 8; /* The actual size is 20 bytes, but
318 this is all we need. */
319 lmo
.r_map_offset
= 4;
322 lmo
.link_map_size
= 20;
324 lmo
.l_addr_offset
= 0;
327 lmo
.l_name_offset
= 4;
330 lmo
.l_next_offset
= 12;
333 lmo
.l_prev_offset
= 16;
341 _initialize_mips_linux_tdep (void)
343 add_core_fns (®set_core_fns
);