1 /* Native support for MIPS running SVR4, for GDB.
2 Copyright 1994, 1995 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
26 #include <sys/procfs.h>
27 #include <setjmp.h> /* For JB_XXX. */
29 /* Size of elements in jmpbuf */
31 #define JB_ELEMENT_SIZE 4
34 * See the comment in m68k-tdep.c regarding the utility of these functions.
36 * These definitions are from the MIPS SVR4 ABI, so they may work for
37 * any MIPS SVR4 target.
41 supply_gregset (gregsetp
)
45 register greg_t
*regp
= &(*gregsetp
)[0];
46 static char zerobuf
[MAX_REGISTER_RAW_SIZE
] = {0};
48 for (regi
= 0; regi
<= CXT_RA
; regi
++)
49 supply_register (regi
, (char *)(regp
+ regi
));
51 supply_register (PC_REGNUM
, (char *)(regp
+ CXT_EPC
));
52 supply_register (HI_REGNUM
, (char *)(regp
+ CXT_MDHI
));
53 supply_register (LO_REGNUM
, (char *)(regp
+ CXT_MDLO
));
54 supply_register (CAUSE_REGNUM
, (char *)(regp
+ CXT_CAUSE
));
56 /* Fill inaccessible registers with zero. */
57 supply_register (PS_REGNUM
, zerobuf
);
58 supply_register (BADVADDR_REGNUM
, zerobuf
);
59 supply_register (FP_REGNUM
, zerobuf
);
60 for (regi
= FIRST_EMBED_REGNUM
; regi
<= LAST_EMBED_REGNUM
; regi
++)
61 supply_register (regi
, zerobuf
);
65 fill_gregset (gregsetp
, regno
)
70 register greg_t
*regp
= &(*gregsetp
)[0];
72 for (regi
= 0; regi
<= 32; regi
++)
73 if ((regno
== -1) || (regno
== regi
))
74 *(regp
+ regi
) = *(greg_t
*) ®isters
[REGISTER_BYTE (regi
)];
76 if ((regno
== -1) || (regno
== PC_REGNUM
))
77 *(regp
+ CXT_EPC
) = *(greg_t
*) ®isters
[REGISTER_BYTE (PC_REGNUM
)];
79 if ((regno
== -1) || (regno
== CAUSE_REGNUM
))
80 *(regp
+ CXT_CAUSE
) = *(greg_t
*) ®isters
[REGISTER_BYTE (CAUSE_REGNUM
)];
82 if ((regno
== -1) || (regno
== HI_REGNUM
))
83 *(regp
+ CXT_MDHI
) = *(greg_t
*) ®isters
[REGISTER_BYTE (HI_REGNUM
)];
85 if ((regno
== -1) || (regno
== LO_REGNUM
))
86 *(regp
+ CXT_MDLO
) = *(greg_t
*) ®isters
[REGISTER_BYTE (LO_REGNUM
)];
90 * Now we do the same thing for floating-point registers.
91 * We don't bother to condition on FP0_REGNUM since any
92 * reasonable MIPS configuration has an R3010 in it.
94 * Again, see the comments in m68k-tdep.c.
98 supply_fpregset (fpregsetp
)
99 fpregset_t
*fpregsetp
;
102 static char zerobuf
[MAX_REGISTER_RAW_SIZE
] = {0};
104 for (regi
= 0; regi
< 32; regi
++)
105 supply_register (FP0_REGNUM
+ regi
,
106 (char *)&fpregsetp
->fp_r
.fp_regs
[regi
]);
108 supply_register (FCRCS_REGNUM
, (char *)&fpregsetp
->fp_csr
);
110 /* FIXME: how can we supply FCRIR_REGNUM? The ABI doesn't tell us. */
111 supply_register (FCRIR_REGNUM
, zerobuf
);
115 fill_fpregset (fpregsetp
, regno
)
116 fpregset_t
*fpregsetp
;
122 for (regi
= FP0_REGNUM
; regi
< FP0_REGNUM
+ 32; regi
++)
124 if ((regno
== -1) || (regno
== regi
))
126 from
= (char *) ®isters
[REGISTER_BYTE (regi
)];
127 to
= (char *) &(fpregsetp
->fp_r
.fp_regs
[regi
- FP0_REGNUM
]);
128 memcpy(to
, from
, REGISTER_RAW_SIZE (regi
));
132 if ((regno
== -1) || (regno
== FCRCS_REGNUM
))
133 fpregsetp
->fp_csr
= *(unsigned *) ®isters
[REGISTER_BYTE(FCRCS_REGNUM
)];
137 /* Figure out where the longjmp will land.
138 We expect the first arg to be a pointer to the jmp_buf structure from which
139 we extract the pc (_JB_PC) that we will land at. The pc is copied into PC.
140 This routine returns true on success. */
143 get_longjmp_target (pc
)
146 char buf
[TARGET_PTR_BIT
/ TARGET_CHAR_BIT
];
149 jb_addr
= read_register (A0_REGNUM
);
151 if (target_read_memory (jb_addr
+ _JB_PC
* JB_ELEMENT_SIZE
, buf
,
152 TARGET_PTR_BIT
/ TARGET_CHAR_BIT
))
155 *pc
= extract_address (buf
, TARGET_PTR_BIT
/ TARGET_CHAR_BIT
);
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