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c906108c SS |
1 | /* Native-dependent code for SVR4 Unix running on i386's, for GDB. |
2 | Copyright 1988, 1989, 1991, 1992, 1996, 1998 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GDB. | |
5 | ||
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. | |
10 | ||
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. | |
15 | ||
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, Boston, MA 02111-1307, USA. */ | |
19 | ||
20 | #include "defs.h" | |
21 | #include "value.h" | |
7a292a7a | 22 | #include "inferior.h" |
c906108c SS |
23 | |
24 | #ifdef HAVE_SYS_REG_H | |
25 | #include <sys/reg.h> | |
26 | #endif | |
27 | ||
28 | ||
29 | #ifdef HAVE_SYS_PROCFS_H | |
30 | ||
31 | #include <sys/procfs.h> | |
32 | ||
33 | /* The /proc interface divides the target machine's register set up into | |
34 | two different sets, the general register set (gregset) and the floating | |
35 | point register set (fpregset). For each set, there is an ioctl to get | |
36 | the current register set and another ioctl to set the current values. | |
37 | ||
38 | The actual structure passed through the ioctl interface is, of course, | |
39 | naturally machine dependent, and is different for each set of registers. | |
40 | For the i386 for example, the general register set is typically defined | |
41 | by: | |
42 | ||
43 | typedef int gregset_t[19]; (in <sys/regset.h>) | |
44 | ||
45 | #define GS 0 (in <sys/reg.h>) | |
46 | #define FS 1 | |
47 | ... | |
48 | #define UESP 17 | |
49 | #define SS 18 | |
50 | ||
51 | and the floating point set by: | |
52 | ||
53 | typedef struct fpregset | |
54 | { | |
55 | union | |
56 | { | |
57 | struct fpchip_state // fp extension state // | |
58 | { | |
59 | int state[27]; // 287/387 saved state // | |
60 | int status; // status word saved at exception // | |
61 | } fpchip_state; | |
62 | struct fp_emul_space // for emulators // | |
63 | { | |
64 | char fp_emul[246]; | |
65 | char fp_epad[2]; | |
66 | } fp_emul_space; | |
67 | int f_fpregs[62]; // union of the above // | |
68 | } fp_reg_set; | |
69 | long f_wregs[33]; // saved weitek state // | |
70 | } fpregset_t; | |
71 | ||
72 | These routines provide the packing and unpacking of gregset_t and | |
73 | fpregset_t formatted data. | |
74 | ||
75 | */ | |
76 | ||
77 | #ifdef HAVE_GREGSET_T | |
78 | ||
79 | /* This is a duplicate of the table in i386-xdep.c. */ | |
80 | ||
81 | static int regmap[] = | |
82 | { | |
83 | EAX, ECX, EDX, EBX, | |
84 | UESP, EBP, ESI, EDI, | |
85 | EIP, EFL, CS, SS, | |
86 | DS, ES, FS, GS, | |
87 | }; | |
88 | ||
89 | /* Prototypes for local functions */ | |
90 | ||
91 | void fill_gregset PARAMS ((gregset_t *, int)); | |
92 | ||
93 | void supply_gregset PARAMS ((gregset_t *)); | |
94 | ||
95 | void supply_fpregset PARAMS ((fpregset_t *)); | |
96 | ||
97 | void fill_fpregset PARAMS ((fpregset_t *, int)); | |
98 | ||
99 | ||
100 | /* FIXME: These routine absolutely depends upon (NUM_REGS - NUM_FREGS) | |
101 | being less than or equal to the number of registers that can be stored | |
102 | in a gregset_t. Note that with the current scheme there will typically | |
103 | be more registers actually stored in a gregset_t that what we know | |
104 | about. This is bogus and should be fixed. */ | |
105 | ||
106 | /* Given a pointer to a general register set in /proc format (gregset_t *), | |
107 | unpack the register contents and supply them as gdb's idea of the current | |
108 | register values. */ | |
109 | ||
110 | void | |
111 | supply_gregset (gregsetp) | |
112 | gregset_t *gregsetp; | |
113 | { | |
114 | register int regi; | |
115 | register greg_t *regp = (greg_t *) gregsetp; | |
116 | extern int regmap[]; | |
117 | ||
118 | for (regi = 0 ; regi < (NUM_REGS - NUM_FREGS) ; regi++) | |
119 | { | |
120 | supply_register (regi, (char *) (regp + regmap[regi])); | |
121 | } | |
122 | } | |
123 | ||
124 | void | |
125 | fill_gregset (gregsetp, regno) | |
126 | gregset_t *gregsetp; | |
127 | int regno; | |
128 | { | |
129 | int regi; | |
130 | register greg_t *regp = (greg_t *) gregsetp; | |
c906108c SS |
131 | extern int regmap[]; |
132 | ||
133 | for (regi = 0 ; regi < (NUM_REGS - NUM_FREGS) ; regi++) | |
134 | { | |
135 | if ((regno == -1) || (regno == regi)) | |
136 | { | |
137 | *(regp + regmap[regi]) = *(int *) ®isters[REGISTER_BYTE (regi)]; | |
138 | } | |
139 | } | |
140 | } | |
141 | ||
142 | #endif /* HAVE_GREGSET_T */ | |
143 | ||
144 | #if defined (FP0_REGNUM) && defined (HAVE_FPREGSET_T) | |
145 | ||
146 | /* Given a pointer to a floating point register set in /proc format | |
147 | (fpregset_t *), unpack the register contents and supply them as gdb's | |
148 | idea of the current floating point register values. */ | |
149 | ||
150 | void | |
151 | supply_fpregset (fpregsetp) | |
152 | fpregset_t *fpregsetp; | |
153 | { | |
154 | /* FIXME: see m68k-tdep.c for an example, for the m68k. */ | |
155 | } | |
156 | ||
157 | /* Given a pointer to a floating point register set in /proc format | |
158 | (fpregset_t *), update the register specified by REGNO from gdb's idea | |
159 | of the current floating point register set. If REGNO is -1, update | |
160 | them all. */ | |
161 | ||
162 | void | |
163 | fill_fpregset (fpregsetp, regno) | |
164 | fpregset_t *fpregsetp; | |
165 | int regno; | |
166 | { | |
167 | /* FIXME: see m68k-tdep.c for an example, for the m68k. */ | |
168 | } | |
169 | ||
170 | #endif /* defined (FP0_REGNUM) && defined (HAVE_FPREGSET_T) */ | |
171 | ||
172 | #endif /* HAVE_SYS_PROCFS_H */ |