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4d0eabff | 1 | /* Native-dependent code for SVR4 Unix running on i386's, for GDB. |
e33aefba | 2 | Copyright 1988, 1989, 1991, 1992, 1996 Free Software Foundation, Inc. |
4d0eabff FF |
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 | |
6c9638b4 | 18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
4d0eabff FF |
19 | |
20 | #include "defs.h" | |
21 | #include <sys/procfs.h> | |
22 | ||
23 | /* The /proc interface divides the target machine's register set up into | |
24 | two different sets, the general register set (gregset) and the floating | |
25 | point register set (fpregset). For each set, there is an ioctl to get | |
26 | the current register set and another ioctl to set the current values. | |
27 | ||
28 | The actual structure passed through the ioctl interface is, of course, | |
29 | naturally machine dependent, and is different for each set of registers. | |
30 | For the i386 for example, the general register set is typically defined | |
31 | by: | |
32 | ||
33 | typedef int gregset_t[19]; (in <sys/regset.h>) | |
34 | ||
35 | #define GS 0 (in <sys/reg.h>) | |
36 | #define FS 1 | |
37 | ... | |
38 | #define UESP 17 | |
39 | #define SS 18 | |
40 | ||
41 | and the floating point set by: | |
42 | ||
43 | typedef struct fpregset | |
44 | { | |
45 | union | |
46 | { | |
47 | struct fpchip_state // fp extension state // | |
48 | { | |
49 | int state[27]; // 287/387 saved state // | |
50 | int status; // status word saved at exception // | |
51 | } fpchip_state; | |
52 | struct fp_emul_space // for emulators // | |
53 | { | |
54 | char fp_emul[246]; | |
55 | char fp_epad[2]; | |
56 | } fp_emul_space; | |
57 | int f_fpregs[62]; // union of the above // | |
58 | } fp_reg_set; | |
59 | long f_wregs[33]; // saved weitek state // | |
60 | } fpregset_t; | |
61 | ||
62 | These routines provide the packing and unpacking of gregset_t and | |
63 | fpregset_t formatted data. | |
64 | ||
65 | */ | |
66 | ||
67 | /* This is a duplicate of the table in i386-xdep.c. */ | |
68 | ||
69 | static int regmap[] = | |
70 | { | |
71 | EAX, ECX, EDX, EBX, | |
72 | UESP, EBP, ESI, EDI, | |
73 | EIP, EFL, CS, SS, | |
74 | DS, ES, FS, GS, | |
75 | }; | |
76 | ||
77 | ||
e33aefba FF |
78 | /* FIXME: These routine absolutely depends upon (NUM_REGS - NUM_FREGS) |
79 | being less than or equal to the number of registers that can be stored | |
80 | in a gregset_t. Note that with the current scheme there will typically | |
81 | be more registers actually stored in a gregset_t that what we know | |
82 | about. This is bogus and should be fixed. */ | |
83 | ||
4d0eabff FF |
84 | /* Given a pointer to a general register set in /proc format (gregset_t *), |
85 | unpack the register contents and supply them as gdb's idea of the current | |
86 | register values. */ | |
87 | ||
88 | void | |
89 | supply_gregset (gregsetp) | |
90 | gregset_t *gregsetp; | |
91 | { | |
92 | register int regi; | |
93 | register greg_t *regp = (greg_t *) gregsetp; | |
94 | extern int regmap[]; | |
95 | ||
e33aefba | 96 | for (regi = 0 ; regi < (NUM_REGS - NUM_FREGS) ; regi++) |
4d0eabff FF |
97 | { |
98 | supply_register (regi, (char *) (regp + regmap[regi])); | |
99 | } | |
100 | } | |
101 | ||
102 | void | |
103 | fill_gregset (gregsetp, regno) | |
104 | gregset_t *gregsetp; | |
105 | int regno; | |
106 | { | |
107 | int regi; | |
108 | register greg_t *regp = (greg_t *) gregsetp; | |
109 | extern char registers[]; | |
110 | extern int regmap[]; | |
111 | ||
e33aefba | 112 | for (regi = 0 ; regi < (NUM_REGS - NUM_FREGS) ; regi++) |
4d0eabff FF |
113 | { |
114 | if ((regno == -1) || (regno == regi)) | |
115 | { | |
116 | *(regp + regmap[regi]) = *(int *) ®isters[REGISTER_BYTE (regi)]; | |
117 | } | |
118 | } | |
119 | } | |
120 | ||
121 | #if defined (FP0_REGNUM) | |
122 | ||
123 | /* Given a pointer to a floating point register set in /proc format | |
124 | (fpregset_t *), unpack the register contents and supply them as gdb's | |
125 | idea of the current floating point register values. */ | |
126 | ||
127 | void | |
128 | supply_fpregset (fpregsetp) | |
129 | fpregset_t *fpregsetp; | |
130 | { | |
131 | register int regi; | |
132 | ||
133 | /* FIXME: see m68k-tdep.c for an example, for the m68k. */ | |
134 | } | |
135 | ||
136 | /* Given a pointer to a floating point register set in /proc format | |
137 | (fpregset_t *), update the register specified by REGNO from gdb's idea | |
138 | of the current floating point register set. If REGNO is -1, update | |
139 | them all. */ | |
140 | ||
141 | void | |
142 | fill_fpregset (fpregsetp, regno) | |
143 | fpregset_t *fpregsetp; | |
144 | int regno; | |
145 | { | |
146 | int regi; | |
147 | char *to; | |
148 | char *from; | |
149 | extern char registers[]; | |
150 | ||
151 | /* FIXME: see m68k-tdep.c for an example, for the m68k. */ | |
152 | } | |
153 | ||
154 | #endif /* defined (FP0_REGNUM) */ |