| 1 | /* Native-dependent code for SVR4 Unix running on i386's, for GDB. |
| 2 | Copyright 1988, 1989, 1991, 1992, 1996, 1998 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, |
| 19 | Boston, MA 02111-1307, USA. */ |
| 20 | |
| 21 | #include "defs.h" |
| 22 | #include "value.h" |
| 23 | #include "inferior.h" |
| 24 | |
| 25 | #ifdef HAVE_SYS_REG_H |
| 26 | #include <sys/reg.h> |
| 27 | #endif |
| 28 | |
| 29 | |
| 30 | #ifdef HAVE_SYS_PROCFS_H |
| 31 | |
| 32 | #include <sys/procfs.h> |
| 33 | |
| 34 | /* The /proc interface divides the target machine's register set up into |
| 35 | two different sets, the general register set (gregset) and the floating |
| 36 | point register set (fpregset). For each set, there is an ioctl to get |
| 37 | the current register set and another ioctl to set the current values. |
| 38 | |
| 39 | The actual structure passed through the ioctl interface is, of course, |
| 40 | naturally machine dependent, and is different for each set of registers. |
| 41 | For the i386 for example, the general register set is typically defined |
| 42 | by: |
| 43 | |
| 44 | typedef int gregset_t[19]; (in <sys/regset.h>) |
| 45 | |
| 46 | #define GS 0 (in <sys/reg.h>) |
| 47 | #define FS 1 |
| 48 | ... |
| 49 | #define UESP 17 |
| 50 | #define SS 18 |
| 51 | |
| 52 | and the floating point set by: |
| 53 | |
| 54 | typedef struct fpregset |
| 55 | { |
| 56 | union |
| 57 | { |
| 58 | struct fpchip_state // fp extension state // |
| 59 | { |
| 60 | int state[27]; // 287/387 saved state // |
| 61 | int status; // status word saved at exception // |
| 62 | } fpchip_state; |
| 63 | struct fp_emul_space // for emulators // |
| 64 | { |
| 65 | char fp_emul[246]; |
| 66 | char fp_epad[2]; |
| 67 | } fp_emul_space; |
| 68 | int f_fpregs[62]; // union of the above // |
| 69 | } fp_reg_set; |
| 70 | long f_wregs[33]; // saved weitek state // |
| 71 | } fpregset_t; |
| 72 | |
| 73 | These routines provide the packing and unpacking of gregset_t and |
| 74 | fpregset_t formatted data. |
| 75 | |
| 76 | */ |
| 77 | |
| 78 | #ifdef HAVE_GREGSET_T |
| 79 | |
| 80 | /* This is a duplicate of the table in i386-xdep.c. */ |
| 81 | |
| 82 | static int regmap[] = |
| 83 | { |
| 84 | EAX, ECX, EDX, EBX, |
| 85 | UESP, EBP, ESI, EDI, |
| 86 | EIP, EFL, CS, SS, |
| 87 | DS, ES, FS, GS, |
| 88 | }; |
| 89 | |
| 90 | /* Prototypes for local functions */ |
| 91 | |
| 92 | void fill_gregset PARAMS ((gregset_t *, int)); |
| 93 | |
| 94 | void supply_gregset PARAMS ((gregset_t *)); |
| 95 | |
| 96 | void supply_fpregset PARAMS ((fpregset_t *)); |
| 97 | |
| 98 | void fill_fpregset PARAMS ((fpregset_t *, int)); |
| 99 | |
| 100 | |
| 101 | /* FIXME: These routine absolutely depends upon (NUM_REGS - NUM_FREGS) |
| 102 | being less than or equal to the number of registers that can be stored |
| 103 | in a gregset_t. Note that with the current scheme there will typically |
| 104 | be more registers actually stored in a gregset_t that what we know |
| 105 | about. This is bogus and should be fixed. */ |
| 106 | |
| 107 | /* Given a pointer to a general register set in /proc format (gregset_t *), |
| 108 | unpack the register contents and supply them as gdb's idea of the current |
| 109 | register values. */ |
| 110 | |
| 111 | void |
| 112 | supply_gregset (gregsetp) |
| 113 | gregset_t *gregsetp; |
| 114 | { |
| 115 | register int regi; |
| 116 | register greg_t *regp = (greg_t *) gregsetp; |
| 117 | extern int regmap[]; |
| 118 | |
| 119 | for (regi = 0; regi < (NUM_REGS - NUM_FREGS); regi++) |
| 120 | { |
| 121 | supply_register (regi, (char *) (regp + regmap[regi])); |
| 122 | } |
| 123 | } |
| 124 | |
| 125 | void |
| 126 | fill_gregset (gregsetp, regno) |
| 127 | gregset_t *gregsetp; |
| 128 | int regno; |
| 129 | { |
| 130 | int regi; |
| 131 | register greg_t *regp = (greg_t *) gregsetp; |
| 132 | extern int regmap[]; |
| 133 | |
| 134 | for (regi = 0; regi < (NUM_REGS - NUM_FREGS); regi++) |
| 135 | { |
| 136 | if ((regno == -1) || (regno == regi)) |
| 137 | { |
| 138 | *(regp + regmap[regi]) = *(int *) ®isters[REGISTER_BYTE (regi)]; |
| 139 | } |
| 140 | } |
| 141 | } |
| 142 | |
| 143 | #endif /* HAVE_GREGSET_T */ |
| 144 | |
| 145 | #if defined (FP0_REGNUM) && defined (HAVE_FPREGSET_T) |
| 146 | |
| 147 | /* Given a pointer to a floating point register set in /proc format |
| 148 | (fpregset_t *), unpack the register contents and supply them as gdb's |
| 149 | idea of the current floating point register values. */ |
| 150 | |
| 151 | void |
| 152 | supply_fpregset (fpregsetp) |
| 153 | fpregset_t *fpregsetp; |
| 154 | { |
| 155 | /* FIXME: see m68k-tdep.c for an example, for the m68k. */ |
| 156 | } |
| 157 | |
| 158 | /* Given a pointer to a floating point register set in /proc format |
| 159 | (fpregset_t *), update the register specified by REGNO from gdb's idea |
| 160 | of the current floating point register set. If REGNO is -1, update |
| 161 | them all. */ |
| 162 | |
| 163 | void |
| 164 | fill_fpregset (fpregsetp, regno) |
| 165 | fpregset_t *fpregsetp; |
| 166 | int regno; |
| 167 | { |
| 168 | /* FIXME: see m68k-tdep.c for an example, for the m68k. */ |
| 169 | } |
| 170 | |
| 171 | #endif /* defined (FP0_REGNUM) && defined (HAVE_FPREGSET_T) */ |
| 172 | |
| 173 | #endif /* HAVE_SYS_PROCFS_H */ |