/* Native-dependent code for SVR4 Unix running on i386's, for GDB. Copyright 1988, 1989, 1991, 1992 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., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include "defs.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. */ /* 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, }; /* 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 ; 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 char registers[]; extern int regmap[]; for (regi = 0 ; regi < NUM_REGS ; regi++) { if ((regno == -1) || (regno == regi)) { *(regp + regmap[regi]) = *(int *) ®isters[REGISTER_BYTE (regi)]; } } } #if defined (FP0_REGNUM) /* 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; { register int regi; /* 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; { int regi; char *to; char *from; extern char registers[]; /* FIXME: see m68k-tdep.c for an example, for the m68k. */ } #endif /* defined (FP0_REGNUM) */