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Diffstat (limited to 'gdb/i386-v4-nat.c')
| -rw-r--r-- | gdb/i386-v4-nat.c | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/gdb/i386-v4-nat.c b/gdb/i386-v4-nat.c new file mode 100644 index 0000000..4d1020b --- /dev/null +++ b/gdb/i386-v4-nat.c @@ -0,0 +1,163 @@ +/* Native-dependent code for Unix SVR4 running on i386's. + + Copyright (C) 1988-2016 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 3 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, see <http://www.gnu.org/licenses/>. */ + +#include "defs.h" +#include "value.h" +#include "inferior.h" +#include "regcache.h" + +#ifdef HAVE_SYS_REG_H +#include <sys/reg.h> +#endif + +#include "i386-tdep.h" +#include "i387-tdep.h" + +#ifdef HAVE_SYS_PROCFS_H + +#include <sys/procfs.h> + +/* We must not compile this code for 64-bit Solaris x86. */ +#if !defined (PR_MODEL_NATIVE) || (PR_MODEL_NATIVE == PR_MODEL_ILP32) + +#include "gregset.h" + +/* The `/proc' interface divides the target machine's register set up + into two different sets, the general purpose 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-purpose + 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; + + Incidentally fpchip_state contains the FPU state in the same format + as used by the "fsave" instruction, and that's the only thing we + support here. I don't know how the emulator stores it state. The + Weitek stuff definitely isn't supported. + + The routines defined here, provide the packing and unpacking of + gregset_t and fpregset_t formatted data. */ + +#ifdef HAVE_GREGSET_T + +/* Mapping between the general-purpose registers in `/proc' + format and GDB's register array layout. */ +static int regmap[] = +{ + EAX, ECX, EDX, EBX, + UESP, EBP, ESI, EDI, + EIP, EFL, CS, SS, + DS, ES, FS, GS +}; + +/* Fill GDB's register array with the general-purpose register values + in *GREGSETP. */ + +void +supply_gregset (struct regcache *regcache, const gregset_t *gregsetp) +{ + const greg_t *regp = (const greg_t *) gregsetp; + int regnum; + + for (regnum = 0; regnum < I386_NUM_GREGS; regnum++) + regcache_raw_supply (regcache, regnum, regp + regmap[regnum]); +} + +/* Fill register REGNUM (if it is a general-purpose register) in + *GREGSETPS with the value in GDB's register array. If REGNUM is -1, + do this for all registers. */ + +void +fill_gregset (const struct regcache *regcache, + gregset_t *gregsetp, int regnum) +{ + greg_t *regp = (greg_t *) gregsetp; + int i; + + for (i = 0; i < I386_NUM_GREGS; i++) + if (regnum == -1 || regnum == i) + regcache_raw_collect (regcache, i, regp + regmap[i]); +} + +#endif /* HAVE_GREGSET_T */ + +#ifdef HAVE_FPREGSET_T + +/* Fill GDB's register array with the floating-point register values in + *FPREGSETP. */ + +void +supply_fpregset (struct regcache *regcache, const fpregset_t *fpregsetp) +{ + if (gdbarch_fp0_regnum (get_regcache_arch (regcache)) == 0) + return; + + i387_supply_fsave (regcache, -1, fpregsetp); +} + +/* Fill register REGNO (if it is a floating-point register) in + *FPREGSETP with the value in GDB's register array. If REGNO is -1, + do this for all registers. */ + +void +fill_fpregset (const struct regcache *regcache, + fpregset_t *fpregsetp, int regno) +{ + if (gdbarch_fp0_regnum (get_regcache_arch (regcache)) == 0) + return; + + i387_collect_fsave (regcache, regno, fpregsetp); +} + +#endif /* HAVE_FPREGSET_T */ + +#endif /* not 64-bit. */ + +#endif /* HAVE_SYS_PROCFS_H */ |