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c906108c
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1/* Native support for MIPS running SVR4, for GDB.
2 Copyright 1994, 1995 Free Software Foundation, Inc.
3
c5aa993b 4 This file is part of GDB.
c906108c 5
c5aa993b
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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.
c906108c 10
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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.
c906108c 15
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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. */
c906108c
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20
21#include "defs.h"
22#include "inferior.h"
23#include "gdbcore.h"
24#include "target.h"
25
26#include <sys/time.h>
27#include <sys/procfs.h>
28#include <setjmp.h> /* For JB_XXX. */
29
30/* Size of elements in jmpbuf */
31
32#define JB_ELEMENT_SIZE 4
33
34/*
35 * See the comment in m68k-tdep.c regarding the utility of these functions.
36 *
37 * These definitions are from the MIPS SVR4 ABI, so they may work for
38 * any MIPS SVR4 target.
39 */
40
c5aa993b 41void
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42supply_gregset (gregsetp)
43 gregset_t *gregsetp;
44{
45 register int regi;
46 register greg_t *regp = &(*gregsetp)[0];
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47 static char zerobuf[MAX_REGISTER_RAW_SIZE] =
48 {0};
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49
50 for (regi = 0; regi <= CXT_RA; regi++)
c5aa993b 51 supply_register (regi, (char *) (regp + regi));
c906108c 52
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53 supply_register (PC_REGNUM, (char *) (regp + CXT_EPC));
54 supply_register (HI_REGNUM, (char *) (regp + CXT_MDHI));
55 supply_register (LO_REGNUM, (char *) (regp + CXT_MDLO));
56 supply_register (CAUSE_REGNUM, (char *) (regp + CXT_CAUSE));
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57
58 /* Fill inaccessible registers with zero. */
59 supply_register (PS_REGNUM, zerobuf);
60 supply_register (BADVADDR_REGNUM, zerobuf);
61 supply_register (FP_REGNUM, zerobuf);
62 supply_register (UNUSED_REGNUM, zerobuf);
63 for (regi = FIRST_EMBED_REGNUM; regi <= LAST_EMBED_REGNUM; regi++)
64 supply_register (regi, zerobuf);
65}
66
67void
68fill_gregset (gregsetp, regno)
69 gregset_t *gregsetp;
70 int regno;
71{
72 int regi;
73 register greg_t *regp = &(*gregsetp)[0];
74
75 for (regi = 0; regi <= 32; regi++)
76 if ((regno == -1) || (regno == regi))
c5aa993b 77 *(regp + regi) = *(greg_t *) & registers[REGISTER_BYTE (regi)];
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78
79 if ((regno == -1) || (regno == PC_REGNUM))
c5aa993b 80 *(regp + CXT_EPC) = *(greg_t *) & registers[REGISTER_BYTE (PC_REGNUM)];
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81
82 if ((regno == -1) || (regno == CAUSE_REGNUM))
c5aa993b 83 *(regp + CXT_CAUSE) = *(greg_t *) & registers[REGISTER_BYTE (CAUSE_REGNUM)];
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84
85 if ((regno == -1) || (regno == HI_REGNUM))
c5aa993b 86 *(regp + CXT_MDHI) = *(greg_t *) & registers[REGISTER_BYTE (HI_REGNUM)];
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87
88 if ((regno == -1) || (regno == LO_REGNUM))
c5aa993b 89 *(regp + CXT_MDLO) = *(greg_t *) & registers[REGISTER_BYTE (LO_REGNUM)];
c906108c
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90}
91
92/*
93 * Now we do the same thing for floating-point registers.
94 * We don't bother to condition on FP0_REGNUM since any
95 * reasonable MIPS configuration has an R3010 in it.
96 *
97 * Again, see the comments in m68k-tdep.c.
98 */
99
100void
101supply_fpregset (fpregsetp)
102 fpregset_t *fpregsetp;
103{
104 register int regi;
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105 static char zerobuf[MAX_REGISTER_RAW_SIZE] =
106 {0};
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107
108 for (regi = 0; regi < 32; regi++)
109 supply_register (FP0_REGNUM + regi,
c5aa993b 110 (char *) &fpregsetp->fp_r.fp_regs[regi]);
c906108c 111
c5aa993b 112 supply_register (FCRCS_REGNUM, (char *) &fpregsetp->fp_csr);
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113
114 /* FIXME: how can we supply FCRIR_REGNUM? The ABI doesn't tell us. */
115 supply_register (FCRIR_REGNUM, zerobuf);
116}
117
118void
119fill_fpregset (fpregsetp, regno)
120 fpregset_t *fpregsetp;
121 int regno;
122{
123 int regi;
124 char *from, *to;
125
126 for (regi = FP0_REGNUM; regi < FP0_REGNUM + 32; regi++)
127 {
128 if ((regno == -1) || (regno == regi))
129 {
130 from = (char *) &registers[REGISTER_BYTE (regi)];
131 to = (char *) &(fpregsetp->fp_r.fp_regs[regi - FP0_REGNUM]);
c5aa993b 132 memcpy (to, from, REGISTER_RAW_SIZE (regi));
c906108c
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133 }
134 }
135
136 if ((regno == -1) || (regno == FCRCS_REGNUM))
c5aa993b 137 fpregsetp->fp_csr = *(unsigned *) &registers[REGISTER_BYTE (FCRCS_REGNUM)];
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138}
139
140
141/* Figure out where the longjmp will land.
142 We expect the first arg to be a pointer to the jmp_buf structure from which
143 we extract the pc (_JB_PC) that we will land at. The pc is copied into PC.
144 This routine returns true on success. */
145
146int
147get_longjmp_target (pc)
148 CORE_ADDR *pc;
149{
150 char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT];
151 CORE_ADDR jb_addr;
152
153 jb_addr = read_register (A0_REGNUM);
154
155 if (target_read_memory (jb_addr + _JB_PC * JB_ELEMENT_SIZE, buf,
156 TARGET_PTR_BIT / TARGET_CHAR_BIT))
157 return 0;
158
159 *pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
160
161 return 1;
162}