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