1 /* Target-dependent code for GNU/Linux on MIPS processors.
3 Copyright 2001, 2002 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. */
25 #include "solib-svr4.h"
27 /* Copied from <asm/elf.h>. */
31 typedef unsigned char elf_greg_t
[4];
32 typedef elf_greg_t elf_gregset_t
[ELF_NGREG
];
34 typedef unsigned char elf_fpreg_t
[8];
35 typedef elf_fpreg_t elf_fpregset_t
[ELF_NFPREG
];
37 /* 0 - 31 are integer registers, 32 - 63 are fp registers. */
52 #define EF_CP0_BADVADDR 41
53 #define EF_CP0_STATUS 42
54 #define EF_CP0_CAUSE 43
58 /* Figure out where the longjmp will land.
59 We expect the first arg to be a pointer to the jmp_buf structure from
60 which we extract the pc (MIPS_LINUX_JB_PC) that we will land at. The pc
61 is copied into PC. This routine returns 1 on success. */
64 mips_linux_get_longjmp_target (CORE_ADDR
*pc
)
67 char buf
[TARGET_PTR_BIT
/ TARGET_CHAR_BIT
];
69 jb_addr
= read_register (A0_REGNUM
);
71 if (target_read_memory (jb_addr
72 + MIPS_LINUX_JB_PC
* MIPS_LINUX_JB_ELEMENT_SIZE
,
73 buf
, TARGET_PTR_BIT
/ TARGET_CHAR_BIT
))
76 *pc
= extract_address (buf
, TARGET_PTR_BIT
/ TARGET_CHAR_BIT
);
81 /* Unpack an elf_gregset_t into GDB's register cache. */
84 supply_gregset (elf_gregset_t
*gregsetp
)
87 elf_greg_t
*regp
= *gregsetp
;
88 char *zerobuf
= alloca (MAX_REGISTER_RAW_SIZE
);
90 memset (zerobuf
, 0, MAX_REGISTER_RAW_SIZE
);
92 for (regi
= EF_REG0
; regi
<= EF_REG31
; regi
++)
93 supply_register ((regi
- EF_REG0
), (char *)(regp
+ regi
));
95 supply_register (LO_REGNUM
, (char *)(regp
+ EF_LO
));
96 supply_register (HI_REGNUM
, (char *)(regp
+ EF_HI
));
98 supply_register (PC_REGNUM
, (char *)(regp
+ EF_CP0_EPC
));
99 supply_register (BADVADDR_REGNUM
, (char *)(regp
+ EF_CP0_BADVADDR
));
100 supply_register (PS_REGNUM
, (char *)(regp
+ EF_CP0_STATUS
));
101 supply_register (CAUSE_REGNUM
, (char *)(regp
+ EF_CP0_CAUSE
));
103 /* Fill inaccessible registers with zero. */
104 supply_register (UNUSED_REGNUM
, zerobuf
);
105 for (regi
= FIRST_EMBED_REGNUM
; regi
< LAST_EMBED_REGNUM
; regi
++)
106 supply_register (regi
, zerobuf
);
109 /* Pack our registers (or one register) into an elf_gregset_t. */
112 fill_gregset (elf_gregset_t
*gregsetp
, int regno
)
115 elf_greg_t
*regp
= *gregsetp
;
120 memset (regp
, 0, sizeof (elf_gregset_t
));
121 for (regi
= 0; regi
< 32; regi
++)
122 fill_gregset (gregsetp
, regi
);
123 fill_gregset (gregsetp
, LO_REGNUM
);
124 fill_gregset (gregsetp
, HI_REGNUM
);
125 fill_gregset (gregsetp
, PC_REGNUM
);
126 fill_gregset (gregsetp
, BADVADDR_REGNUM
);
127 fill_gregset (gregsetp
, PS_REGNUM
);
128 fill_gregset (gregsetp
, CAUSE_REGNUM
);
135 src
= ®isters
[REGISTER_BYTE (regno
)];
136 dst
= regp
+ regno
+ EF_REG0
;
137 memcpy (dst
, src
, sizeof (elf_greg_t
));
151 regaddr
= EF_CP0_EPC
;
153 case BADVADDR_REGNUM
:
154 regaddr
= EF_CP0_BADVADDR
;
157 regaddr
= EF_CP0_STATUS
;
160 regaddr
= EF_CP0_CAUSE
;
166 src
= ®isters
[REGISTER_BYTE (regno
)];
167 dst
= regp
+ regaddr
;
168 memcpy (dst
, src
, sizeof (elf_greg_t
));
172 /* Likewise, unpack an elf_fpregset_t. */
175 supply_fpregset (elf_fpregset_t
*fpregsetp
)
178 char *zerobuf
= alloca (MAX_REGISTER_RAW_SIZE
);
180 memset (zerobuf
, 0, MAX_REGISTER_RAW_SIZE
);
182 for (regi
= 0; regi
< 32; regi
++)
183 supply_register (FP0_REGNUM
+ regi
,
184 (char *)(*fpregsetp
+ regi
));
186 supply_register (FCRCS_REGNUM
, (char *)(*fpregsetp
+ 32));
188 /* FIXME: how can we supply FCRIR_REGNUM? The ABI doesn't tell us. */
189 supply_register (FCRIR_REGNUM
, zerobuf
);
192 /* Likewise, pack one or all floating point registers into an
196 fill_fpregset (elf_fpregset_t
*fpregsetp
, int regno
)
200 if ((regno
>= FP0_REGNUM
) && (regno
< FP0_REGNUM
+ 32))
202 from
= (char *) ®isters
[REGISTER_BYTE (regno
)];
203 to
= (char *) (*fpregsetp
+ regno
- FP0_REGNUM
);
204 memcpy (to
, from
, REGISTER_RAW_SIZE (regno
- FP0_REGNUM
));
206 else if (regno
== FCRCS_REGNUM
)
208 from
= (char *) ®isters
[REGISTER_BYTE (regno
)];
209 to
= (char *) (*fpregsetp
+ 32);
210 memcpy (to
, from
, REGISTER_RAW_SIZE (regno
));
212 else if (regno
== -1)
216 for (regi
= 0; regi
< 32; regi
++)
217 fill_fpregset (fpregsetp
, FP0_REGNUM
+ regi
);
218 fill_fpregset(fpregsetp
, FCRCS_REGNUM
);
222 /* Map gdb internal register number to ptrace ``address''.
223 These ``addresses'' are normally defined in <asm/ptrace.h>. */
226 register_addr (int regno
, CORE_ADDR blockend
)
230 if (regno
< 0 || regno
>= NUM_REGS
)
231 error ("Bogon register number %d.", regno
);
235 else if ((regno
>= FP0_REGNUM
) && (regno
< FP0_REGNUM
+ 32))
236 regaddr
= FPR_BASE
+ (regno
- FP0_REGNUM
);
237 else if (regno
== PC_REGNUM
)
239 else if (regno
== CAUSE_REGNUM
)
241 else if (regno
== BADVADDR_REGNUM
)
243 else if (regno
== LO_REGNUM
)
245 else if (regno
== HI_REGNUM
)
247 else if (regno
== FCRCS_REGNUM
)
249 else if (regno
== FCRIR_REGNUM
)
252 error ("Unknowable register number %d.", regno
);
257 /* Use a local version of this function to get the correct types for
258 regsets, until multi-arch core support is ready. */
261 fetch_core_registers (char *core_reg_sect
, unsigned core_reg_size
,
262 int which
, CORE_ADDR reg_addr
)
264 elf_gregset_t gregset
;
265 elf_fpregset_t fpregset
;
269 if (core_reg_size
!= sizeof (gregset
))
271 warning ("wrong size gregset struct in core file");
275 memcpy ((char *) &gregset
, core_reg_sect
, sizeof (gregset
));
276 supply_gregset (&gregset
);
281 if (core_reg_size
!= sizeof (fpregset
))
283 warning ("wrong size fpregset struct in core file");
287 memcpy ((char *) &fpregset
, core_reg_sect
, sizeof (fpregset
));
288 supply_fpregset (&fpregset
);
293 /* Register that we are able to handle ELF file formats using standard
294 procfs "regset" structures. */
296 static struct core_fns regset_core_fns
=
298 bfd_target_elf_flavour
, /* core_flavour */
299 default_check_format
, /* check_format */
300 default_core_sniffer
, /* core_sniffer */
301 fetch_core_registers
, /* core_read_registers */
305 /* Fetch (and possibly build) an appropriate link_map_offsets
306 structure for native GNU/Linux MIPS targets using the struct offsets
307 defined in link.h (but without actual reference to that file).
309 This makes it possible to access GNU/Linux MIPS shared libraries from a
310 GDB that was built on a different host platform (for cross debugging). */
312 struct link_map_offsets
*
313 mips_linux_svr4_fetch_link_map_offsets (void)
315 static struct link_map_offsets lmo
;
316 static struct link_map_offsets
*lmp
= NULL
;
322 lmo
.r_debug_size
= 8; /* The actual size is 20 bytes, but
323 this is all we need. */
324 lmo
.r_map_offset
= 4;
327 lmo
.link_map_size
= 20;
329 lmo
.l_addr_offset
= 0;
332 lmo
.l_name_offset
= 4;
335 lmo
.l_next_offset
= 12;
338 lmo
.l_prev_offset
= 16;
346 _initialize_mips_linux_tdep (void)
348 add_core_fns (®set_core_fns
);