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4d0eabff | 1 | /* Native-dependent code for SVR4 Unix running on i386's, for GDB. |
24418cfb | 2 | Copyright 1988, 1989, 1991, 1992, 1996, 1998 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 | 19 | |
d58ffc6c | 20 | #include "defs.h" |
24418cfb | 21 | #include "value.h" |
d58ffc6c | 22 | |
9ca743cf AG |
23 | #ifdef HAVE_SYS_REG_H |
24 | #include <sys/reg.h> | |
25 | #endif | |
26 | ||
24418cfb | 27 | |
4708ac65 FF |
28 | #ifdef HAVE_SYS_PROCFS_H |
29 | ||
4d0eabff FF |
30 | #include <sys/procfs.h> |
31 | ||
32 | /* The /proc interface divides the target machine's register set up into | |
33 | two different sets, the general register set (gregset) and the floating | |
34 | point register set (fpregset). For each set, there is an ioctl to get | |
35 | the current register set and another ioctl to set the current values. | |
36 | ||
37 | The actual structure passed through the ioctl interface is, of course, | |
38 | naturally machine dependent, and is different for each set of registers. | |
39 | For the i386 for example, the general register set is typically defined | |
40 | by: | |
41 | ||
42 | typedef int gregset_t[19]; (in <sys/regset.h>) | |
43 | ||
44 | #define GS 0 (in <sys/reg.h>) | |
45 | #define FS 1 | |
46 | ... | |
47 | #define UESP 17 | |
48 | #define SS 18 | |
49 | ||
50 | and the floating point set by: | |
51 | ||
52 | typedef struct fpregset | |
53 | { | |
54 | union | |
55 | { | |
56 | struct fpchip_state // fp extension state // | |
57 | { | |
58 | int state[27]; // 287/387 saved state // | |
59 | int status; // status word saved at exception // | |
60 | } fpchip_state; | |
61 | struct fp_emul_space // for emulators // | |
62 | { | |
63 | char fp_emul[246]; | |
64 | char fp_epad[2]; | |
65 | } fp_emul_space; | |
66 | int f_fpregs[62]; // union of the above // | |
67 | } fp_reg_set; | |
68 | long f_wregs[33]; // saved weitek state // | |
69 | } fpregset_t; | |
70 | ||
71 | These routines provide the packing and unpacking of gregset_t and | |
72 | fpregset_t formatted data. | |
73 | ||
74 | */ | |
75 | ||
4708ac65 FF |
76 | #ifdef HAVE_GREGSET_T |
77 | ||
4d0eabff FF |
78 | /* This is a duplicate of the table in i386-xdep.c. */ |
79 | ||
80 | static int regmap[] = | |
81 | { | |
82 | EAX, ECX, EDX, EBX, | |
83 | UESP, EBP, ESI, EDI, | |
84 | EIP, EFL, CS, SS, | |
85 | DS, ES, FS, GS, | |
86 | }; | |
87 | ||
24418cfb JM |
88 | /* Prototypes for local functions */ |
89 | ||
90 | void fill_gregset PARAMS ((gregset_t *, int)); | |
91 | ||
92 | void supply_gregset PARAMS ((gregset_t *)); | |
93 | ||
94 | void supply_fpregset PARAMS ((fpregset_t *)); | |
95 | ||
96 | void fill_fpregset PARAMS ((fpregset_t *, int)); | |
97 | ||
4d0eabff | 98 | |
e33aefba FF |
99 | /* FIXME: These routine absolutely depends upon (NUM_REGS - NUM_FREGS) |
100 | being less than or equal to the number of registers that can be stored | |
101 | in a gregset_t. Note that with the current scheme there will typically | |
102 | be more registers actually stored in a gregset_t that what we know | |
103 | about. This is bogus and should be fixed. */ | |
104 | ||
4d0eabff FF |
105 | /* Given a pointer to a general register set in /proc format (gregset_t *), |
106 | unpack the register contents and supply them as gdb's idea of the current | |
107 | register values. */ | |
108 | ||
109 | void | |
110 | supply_gregset (gregsetp) | |
111 | gregset_t *gregsetp; | |
112 | { | |
113 | register int regi; | |
114 | register greg_t *regp = (greg_t *) gregsetp; | |
115 | extern int regmap[]; | |
116 | ||
e33aefba | 117 | for (regi = 0 ; regi < (NUM_REGS - NUM_FREGS) ; regi++) |
4d0eabff FF |
118 | { |
119 | supply_register (regi, (char *) (regp + regmap[regi])); | |
120 | } | |
121 | } | |
122 | ||
123 | void | |
124 | fill_gregset (gregsetp, regno) | |
125 | gregset_t *gregsetp; | |
126 | int regno; | |
127 | { | |
128 | int regi; | |
129 | register greg_t *regp = (greg_t *) gregsetp; | |
130 | extern char registers[]; | |
131 | extern int regmap[]; | |
132 | ||
e33aefba | 133 | for (regi = 0 ; regi < (NUM_REGS - NUM_FREGS) ; regi++) |
4d0eabff FF |
134 | { |
135 | if ((regno == -1) || (regno == regi)) | |
136 | { | |
137 | *(regp + regmap[regi]) = *(int *) ®isters[REGISTER_BYTE (regi)]; | |
138 | } | |
139 | } | |
140 | } | |
141 | ||
4708ac65 FF |
142 | #endif /* HAVE_GREGSET_T */ |
143 | ||
144 | #if defined (FP0_REGNUM) && defined (HAVE_FPREGSET_T) | |
4d0eabff FF |
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 | { | |
4d0eabff FF |
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 | { | |
4d0eabff FF |
167 | /* FIXME: see m68k-tdep.c for an example, for the m68k. */ |
168 | } | |
169 | ||
4708ac65 FF |
170 | #endif /* defined (FP0_REGNUM) && defined (HAVE_FPREGSET_T) */ |
171 | ||
172 | #endif /* HAVE_SYS_PROCFS_H */ |