| /* Native-dependent code for SVR4 Unix running on i386's, for GDB. |
| Copyright 1988, 1989, 1991, 1992, 1996, 1998 Free Software Foundation, Inc. |
| |
| This file is part of GDB. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| #include "defs.h" |
| #include "value.h" |
| #include "inferior.h" |
| |
| #ifdef HAVE_SYS_REG_H |
| #include <sys/reg.h> |
| #endif |
| |
| |
| #ifdef HAVE_SYS_PROCFS_H |
| |
| #include <sys/procfs.h> |
| |
| /* The /proc interface divides the target machine's register set up into |
| two different sets, the general register set (gregset) and the floating |
| point register set (fpregset). For each set, there is an ioctl to get |
| the current register set and another ioctl to set the current values. |
| |
| The actual structure passed through the ioctl interface is, of course, |
| naturally machine dependent, and is different for each set of registers. |
| For the i386 for example, the general register set is typically defined |
| by: |
| |
| typedef int gregset_t[19]; (in <sys/regset.h>) |
| |
| #define GS 0 (in <sys/reg.h>) |
| #define FS 1 |
| ... |
| #define UESP 17 |
| #define SS 18 |
| |
| and the floating point set by: |
| |
| typedef struct fpregset |
| { |
| union |
| { |
| struct fpchip_state // fp extension state // |
| { |
| int state[27]; // 287/387 saved state // |
| int status; // status word saved at exception // |
| } fpchip_state; |
| struct fp_emul_space // for emulators // |
| { |
| char fp_emul[246]; |
| char fp_epad[2]; |
| } fp_emul_space; |
| int f_fpregs[62]; // union of the above // |
| } fp_reg_set; |
| long f_wregs[33]; // saved weitek state // |
| } fpregset_t; |
| |
| These routines provide the packing and unpacking of gregset_t and |
| fpregset_t formatted data. |
| |
| */ |
| |
| #ifdef HAVE_GREGSET_T |
| |
| /* This is a duplicate of the table in i386-xdep.c. */ |
| |
| static int regmap[] = |
| { |
| EAX, ECX, EDX, EBX, |
| UESP, EBP, ESI, EDI, |
| EIP, EFL, CS, SS, |
| DS, ES, FS, GS, |
| }; |
| |
| /* Prototypes for local functions */ |
| |
| void fill_gregset PARAMS ((gregset_t *, int)); |
| |
| void supply_gregset PARAMS ((gregset_t *)); |
| |
| void supply_fpregset PARAMS ((fpregset_t *)); |
| |
| void fill_fpregset PARAMS ((fpregset_t *, int)); |
| |
| |
| /* FIXME: These routine absolutely depends upon (NUM_REGS - NUM_FREGS) |
| being less than or equal to the number of registers that can be stored |
| in a gregset_t. Note that with the current scheme there will typically |
| be more registers actually stored in a gregset_t that what we know |
| about. This is bogus and should be fixed. */ |
| |
| /* Given a pointer to a general register set in /proc format (gregset_t *), |
| unpack the register contents and supply them as gdb's idea of the current |
| register values. */ |
| |
| void |
| supply_gregset (gregsetp) |
| gregset_t *gregsetp; |
| { |
| register int regi; |
| register greg_t *regp = (greg_t *) gregsetp; |
| extern int regmap[]; |
| |
| for (regi = 0; regi < (NUM_REGS - NUM_FREGS); regi++) |
| { |
| supply_register (regi, (char *) (regp + regmap[regi])); |
| } |
| } |
| |
| void |
| fill_gregset (gregsetp, regno) |
| gregset_t *gregsetp; |
| int regno; |
| { |
| int regi; |
| register greg_t *regp = (greg_t *) gregsetp; |
| extern int regmap[]; |
| |
| for (regi = 0; regi < (NUM_REGS - NUM_FREGS); regi++) |
| { |
| if ((regno == -1) || (regno == regi)) |
| { |
| *(regp + regmap[regi]) = *(int *) ®isters[REGISTER_BYTE (regi)]; |
| } |
| } |
| } |
| |
| #endif /* HAVE_GREGSET_T */ |
| |
| #if defined (FP0_REGNUM) && defined (HAVE_FPREGSET_T) |
| |
| /* Given a pointer to a floating point register set in /proc format |
| (fpregset_t *), unpack the register contents and supply them as gdb's |
| idea of the current floating point register values. */ |
| |
| void |
| supply_fpregset (fpregsetp) |
| fpregset_t *fpregsetp; |
| { |
| /* FIXME: see m68k-tdep.c for an example, for the m68k. */ |
| } |
| |
| /* Given a pointer to a floating point register set in /proc format |
| (fpregset_t *), update the register specified by REGNO from gdb's idea |
| of the current floating point register set. If REGNO is -1, update |
| them all. */ |
| |
| void |
| fill_fpregset (fpregsetp, regno) |
| fpregset_t *fpregsetp; |
| int regno; |
| { |
| /* FIXME: see m68k-tdep.c for an example, for the m68k. */ |
| } |
| |
| #endif /* defined (FP0_REGNUM) && defined (HAVE_FPREGSET_T) */ |
| |
| #endif /* HAVE_SYS_PROCFS_H */ |