1 /* Native-dependent code for Unix SVR4 running on i386's. 2 3 Copyright 1988, 1989, 1991, 1992, 1996, 1997, 1998, 1999, 2000, 4 2001, 2002, 2004 5 Free Software Foundation, Inc. 6 7 This file is part of GDB. 8 9 This program is free software; you can redistribute it and/or modify 10 it under the terms of the GNU General Public License as published by 11 the Free Software Foundation; either version 2 of the License, or 12 (at your option) any later version. 13 14 This program is distributed in the hope that it will be useful, 15 but WITHOUT ANY WARRANTY; without even the implied warranty of 16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 GNU General Public License for more details. 18 19 You should have received a copy of the GNU General Public License 20 along with this program; if not, write to the Free Software 21 Foundation, Inc., 59 Temple Place - Suite 330, 22 Boston, MA 02111-1307, USA. */ 23 24 #include "defs.h" 25 #include "value.h" 26 #include "inferior.h" 27 #include "regcache.h" 28 29 #ifdef HAVE_SYS_REG_H 30 #include <sys/reg.h> 31 #endif 32 33 #include "i386-tdep.h" 34 #include "i387-tdep.h" 35 36 #ifdef HAVE_SYS_PROCFS_H 37 38 #include <sys/procfs.h> 39 40 /* Prototypes for supply_gregset etc. */ 41 #include "gregset.h" 42 43 /* The `/proc' interface divides the target machine's register set up 44 into two different sets, the general purpose register set (gregset) 45 and the floating-point register set (fpregset). For each set, 46 there is an ioctl to get the current register set and another ioctl 47 to set the current values. 48 49 The actual structure passed through the ioctl interface is, of 50 course, naturally machine dependent, and is different for each set 51 of registers. For the i386 for example, the general-purpose 52 register set is typically defined by: 53 54 typedef int gregset_t[19]; (in <sys/regset.h>) 55 56 #define GS 0 (in <sys/reg.h>) 57 #define FS 1 58 ... 59 #define UESP 17 60 #define SS 18 61 62 and the floating-point set by: 63 64 typedef struct fpregset { 65 union { 66 struct fpchip_state // fp extension state // 67 { 68 int state[27]; // 287/387 saved state // 69 int status; // status word saved at // 70 // exception // 71 } fpchip_state; 72 struct fp_emul_space // for emulators // 73 { 74 char fp_emul[246]; 75 char fp_epad[2]; 76 } fp_emul_space; 77 int f_fpregs[62]; // union of the above // 78 } fp_reg_set; 79 long f_wregs[33]; // saved weitek state // 80 } fpregset_t; 81 82 Incidentally fpchip_state contains the FPU state in the same format 83 as used by the "fsave" instruction, and that's the only thing we 84 support here. I don't know how the emulator stores it state. The 85 Weitek stuff definitely isn't supported. 86 87 The routines defined here, provide the packing and unpacking of 88 gregset_t and fpregset_t formatted data. */ 89 90 #ifdef HAVE_GREGSET_T 91 92 /* Mapping between the general-purpose registers in `/proc' 93 format and GDB's register array layout. */ 94 static int regmap[] = 95 { 96 EAX, ECX, EDX, EBX, 97 UESP, EBP, ESI, EDI, 98 EIP, EFL, CS, SS, 99 DS, ES, FS, GS 100 }; 101 102 /* Fill GDB's register array with the general-purpose register values 103 in *GREGSETP. */ 104 105 void 106 supply_gregset (gregset_t *gregsetp) 107 { 108 greg_t *regp = (greg_t *) gregsetp; 109 int regnum; 110 111 for (regnum = 0; regnum < I386_NUM_GREGS; regnum++) 112 regcache_raw_supply (current_regcache, regnum, regp + regmap[regnum]); 113 } 114 115 /* Fill register REGNUM (if it is a general-purpose register) in 116 *GREGSETPS with the value in GDB's register array. If REGNUM is -1, 117 do this for all registers. */ 118 119 void 120 fill_gregset (gregset_t *gregsetp, int regnum) 121 { 122 greg_t *regp = (greg_t *) gregsetp; 123 int i; 124 125 for (i = 0; i < I386_NUM_GREGS; i++) 126 if (regnum == -1 || regnum == i) 127 regcache_raw_collect (current_regcache, i, regp + regmap[i]); 128 } 129 130 #endif /* HAVE_GREGSET_T */ 131 132 #ifdef HAVE_FPREGSET_T 133 134 /* Fill GDB's register array with the floating-point register values in 135 *FPREGSETP. */ 136 137 void 138 supply_fpregset (fpregset_t *fpregsetp) 139 { 140 if (FP0_REGNUM == 0) 141 return; 142 143 i387_supply_fsave (current_regcache, -1, fpregsetp); 144 } 145 146 /* Fill register REGNO (if it is a floating-point register) in 147 *FPREGSETP with the value in GDB's register array. If REGNO is -1, 148 do this for all registers. */ 149 150 void 151 fill_fpregset (fpregset_t *fpregsetp, int regno) 152 { 153 if (FP0_REGNUM == 0) 154 return; 155 156 i387_fill_fsave ((char *) fpregsetp, regno); 157 } 158 159 #endif /* HAVE_FPREGSET_T */ 160 161 #endif /* HAVE_SYS_PROCFS_H */ 162