1 /* Native support for the SGI Iris running IRIX version 5, for GDB.
3 Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998,
4 1999, 2000, 2001, 2002, 2004, 2006, 2007 Free Software Foundation, Inc.
6 Contributed by Alessandro Forin(af@cs.cmu.edu) at CMU
7 and by Per Bothner(bothner@cs.wisc.edu) at U.Wisconsin.
8 Implemented for Irix 4.x by Garrett A. Wollman.
9 Modified for Irix 5.x by Ian Lance Taylor.
11 This file is part of GDB.
13 This program is free software; you can redistribute it and/or modify
14 it under the terms of the GNU General Public License as published by
15 the Free Software Foundation; either version 2 of the License, or
16 (at your option) any later version.
18 This program is distributed in the hope that it will be useful,
19 but WITHOUT ANY WARRANTY; without even the implied warranty of
20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 GNU General Public License for more details.
23 You should have received a copy of the GNU General Public License
24 along with this program; if not, write to the Free Software
25 Foundation, Inc., 51 Franklin Street, Fifth Floor,
26 Boston, MA 02110-1301, USA. */
34 #include "gdb_string.h"
36 #include <sys/procfs.h>
37 #include <setjmp.h> /* For JB_XXX. */
39 /* Prototypes for supply_gregset etc. */
41 #include "mips-tdep.h"
43 static void fetch_core_registers (char *, unsigned int, int, CORE_ADDR
);
45 /* Size of elements in jmpbuf */
47 #define JB_ELEMENT_SIZE 4
50 * See the comment in m68k-tdep.c regarding the utility of these functions.
52 * These definitions are from the MIPS SVR4 ABI, so they may work for
53 * any MIPS SVR4 target.
57 supply_gregset (gregset_t
*gregsetp
)
60 greg_t
*regp
= &(*gregsetp
)[0];
61 int gregoff
= sizeof (greg_t
) - mips_isa_regsize (current_gdbarch
);
62 static char zerobuf
[32] = {0};
64 for (regi
= 0; regi
<= CTX_RA
; regi
++)
65 regcache_raw_supply (current_regcache
, regi
,
66 (char *) (regp
+ regi
) + gregoff
);
68 regcache_raw_supply (current_regcache
, mips_regnum (current_gdbarch
)->pc
,
69 (char *) (regp
+ CTX_EPC
) + gregoff
);
70 regcache_raw_supply (current_regcache
, mips_regnum (current_gdbarch
)->hi
,
71 (char *) (regp
+ CTX_MDHI
) + gregoff
);
72 regcache_raw_supply (current_regcache
, mips_regnum (current_gdbarch
)->lo
,
73 (char *) (regp
+ CTX_MDLO
) + gregoff
);
74 regcache_raw_supply (current_regcache
, mips_regnum (current_gdbarch
)->cause
,
75 (char *) (regp
+ CTX_CAUSE
) + gregoff
);
77 /* Fill inaccessible registers with zero. */
78 regcache_raw_supply (current_regcache
, mips_regnum (current_gdbarch
)->badvaddr
, zerobuf
);
82 fill_gregset (gregset_t
*gregsetp
, int regno
)
85 greg_t
*regp
= &(*gregsetp
)[0];
86 gdb_byte buf
[MAX_REGISTER_SIZE
];
88 /* Under Irix6, if GDB is built with N32 ABI and is debugging an O32
89 executable, we have to sign extend the registers to 64 bits before
90 filling in the gregset structure. */
92 for (regi
= 0; regi
<= CTX_RA
; regi
++)
93 if ((regno
== -1) || (regno
== regi
))
95 size
= register_size (current_gdbarch
, regi
);
96 regcache_raw_collect (current_regcache
, regi
, buf
);
97 *(regp
+ regi
) = extract_signed_integer (buf
, size
);
100 if ((regno
== -1) || (regno
== PC_REGNUM
))
102 regi
= mips_regnum (current_gdbarch
)->pc
;
103 size
= register_size (current_gdbarch
, regi
);
104 regcache_raw_collect (current_regcache
, regi
, buf
);
105 *(regp
+ CTX_EPC
) = extract_signed_integer (buf
, size
);
108 if ((regno
== -1) || (regno
== mips_regnum (current_gdbarch
)->cause
))
110 regi
= mips_regnum (current_gdbarch
)->cause
;
111 size
= register_size (current_gdbarch
, regi
);
112 regcache_raw_collect (current_regcache
, regi
, buf
);
113 *(regp
+ CTX_CAUSE
) = extract_signed_integer (buf
, size
);
116 if ((regno
== -1) || (regno
== mips_regnum (current_gdbarch
)->hi
))
118 regi
= mips_regnum (current_gdbarch
)->hi
;
119 size
= register_size (current_gdbarch
, regi
);
120 regcache_raw_collect (current_regcache
, regi
, buf
);
121 *(regp
+ CTX_MDHI
) = extract_signed_integer (buf
, size
);
124 if ((regno
== -1) || (regno
== mips_regnum (current_gdbarch
)->lo
))
126 regi
= mips_regnum (current_gdbarch
)->lo
;
127 size
= register_size (current_gdbarch
, regi
);
128 regcache_raw_collect (current_regcache
, regi
, buf
);
129 *(regp
+ CTX_MDLO
) = extract_signed_integer (buf
, size
);
134 * Now we do the same thing for floating-point registers.
135 * We don't bother to condition on FP0_REGNUM since any
136 * reasonable MIPS configuration has an R3010 in it.
138 * Again, see the comments in m68k-tdep.c.
142 supply_fpregset (fpregset_t
*fpregsetp
)
145 static char zerobuf
[32] = {0};
148 /* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs. */
150 for (regi
= 0; regi
< 32; regi
++)
151 regcache_raw_supply (current_regcache
, FP0_REGNUM
+ regi
,
152 (char *) &fpregsetp
->fp_r
.fp_regs
[regi
]);
154 /* We can't supply the FSR register directly to the regcache,
155 because there is a size issue: On one hand, fpregsetp->fp_csr
156 is 32bits long, while the regcache expects a 64bits long value.
157 So we use a buffer of the correct size and copy into it the register
158 value at the proper location. */
159 memset (fsrbuf
, 0, 4);
160 memcpy (fsrbuf
+ 4, &fpregsetp
->fp_csr
, 4);
162 regcache_raw_supply (current_regcache
,
163 mips_regnum (current_gdbarch
)->fp_control_status
,
166 /* FIXME: how can we supply FCRIR? SGI doesn't tell us. */
167 regcache_raw_supply (current_regcache
,
168 mips_regnum (current_gdbarch
)->fp_implementation_revision
,
173 fill_fpregset (fpregset_t
*fpregsetp
, int regno
)
178 /* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs. */
180 for (regi
= FP0_REGNUM
; regi
< FP0_REGNUM
+ 32; regi
++)
182 if ((regno
== -1) || (regno
== regi
))
184 to
= (char *) &(fpregsetp
->fp_r
.fp_regs
[regi
- FP0_REGNUM
]);
185 regcache_raw_collect (current_regcache
, regi
, to
);
190 || regno
== mips_regnum (current_gdbarch
)->fp_control_status
)
194 /* We can't fill the FSR register directly from the regcache,
195 because there is a size issue: On one hand, fpregsetp->fp_csr
196 is 32bits long, while the regcache expects a 64bits long buffer.
197 So we use a buffer of the correct size and copy the register
198 value from that buffer. */
199 regcache_raw_collect (current_regcache
,
200 mips_regnum (current_gdbarch
)->fp_control_status
,
203 memcpy (&fpregsetp
->fp_csr
, fsrbuf
+ 4, 4);
208 /* Figure out where the longjmp will land.
209 We expect the first arg to be a pointer to the jmp_buf structure from which
210 we extract the pc (JB_PC) that we will land at. The pc is copied into PC.
211 This routine returns true on success. */
214 get_longjmp_target (CORE_ADDR
*pc
)
219 buf
= alloca (TARGET_PTR_BIT
/ TARGET_CHAR_BIT
);
220 jb_addr
= read_register (MIPS_A0_REGNUM
);
222 if (target_read_memory (jb_addr
+ JB_PC
* JB_ELEMENT_SIZE
, buf
,
223 TARGET_PTR_BIT
/ TARGET_CHAR_BIT
))
226 *pc
= extract_unsigned_integer (buf
, TARGET_PTR_BIT
/ TARGET_CHAR_BIT
);
231 /* Provide registers to GDB from a core file.
233 CORE_REG_SECT points to an array of bytes, which were obtained from
234 a core file which BFD thinks might contain register contents.
235 CORE_REG_SIZE is its size.
237 Normally, WHICH says which register set corelow suspects this is:
238 0 --- the general-purpose register set
239 2 --- the floating-point register set
240 However, for Irix 5, WHICH isn't used.
242 REG_ADDR is also unused. */
245 fetch_core_registers (char *core_reg_sect
, unsigned core_reg_size
,
246 int which
, CORE_ADDR reg_addr
)
248 char *srcp
= core_reg_sect
;
249 int regsize
= mips_isa_regsize (current_gdbarch
);
252 /* If regsize is 8, this is a N32 or N64 core file.
253 If regsize is 4, this is an O32 core file. */
254 if (core_reg_size
!= regsize
* NUM_REGS
)
256 warning (_("wrong size gregset struct in core file"));
260 for (regno
= 0; regno
< NUM_REGS
; regno
++)
262 regcache_raw_supply (current_regcache
, regno
, srcp
);
267 /* Register that we are able to handle irix5 core file formats.
268 This really is bfd_target_unknown_flavour */
270 static struct core_fns irix5_core_fns
=
272 bfd_target_unknown_flavour
, /* core_flavour */
273 default_check_format
, /* check_format */
274 default_core_sniffer
, /* core_sniffer */
275 fetch_core_registers
, /* core_read_registers */
280 _initialize_core_irix5 (void)
282 deprecated_add_core_fns (&irix5_core_fns
);