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