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409 lines
11 KiB
C
409 lines
11 KiB
C
/* Native-dependent code for Linux running on i386's, for GDB.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "inferior.h"
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#include "gdbcore.h"
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/* For i386_linux_skip_solib_resolver */
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#include "symtab.h"
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#include "frame.h"
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#include "symfile.h"
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#include "objfiles.h"
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#include <sys/ptrace.h>
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#include <sys/user.h>
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#include <sys/procfs.h>
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#ifdef HAVE_SYS_REG_H
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#include <sys/reg.h>
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#endif
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/* This is a duplicate of the table in i386-xdep.c. */
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static int regmap[] =
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{
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EAX, ECX, EDX, EBX,
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UESP, EBP, ESI, EDI,
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EIP, EFL, CS, SS,
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DS, ES, FS, GS,
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};
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/* Given a pointer to a general register set in struct user format
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(gregset_t *), unpack the register contents and supply them as
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gdb's idea of the current register values. */
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void
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supply_gregset (gregsetp)
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gregset_t *gregsetp;
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{
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register int regi;
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register greg_t *regp = (greg_t *) gregsetp;
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for (regi = 0; regi < NUM_GREGS; regi++)
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{
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supply_register (regi, (char *) (regp + regmap[regi]));
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}
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}
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/* Fill in a gregset_t object with selected data from a gdb-format
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register file.
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- GREGSETP points to the gregset_t object to be filled.
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- GDB_REGS points to the GDB-style register file providing the data.
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- VALID is an array indicating which registers in GDB_REGS are
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valid; the parts of *GREGSETP that would hold registers marked
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invalid in GDB_REGS are left unchanged. If VALID is zero, all
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registers are assumed to be valid. */
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void
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convert_to_gregset (gregset_t *gregsetp,
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char *gdb_regs,
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signed char *valid)
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{
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int regi;
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register greg_t *regp = (greg_t *) gregsetp;
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for (regi = 0; regi < NUM_GREGS; regi++)
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if (! valid || valid[regi])
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*(regp + regmap[regi]) = * (int *) ®isters[REGISTER_BYTE (regi)];
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}
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void
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fill_gregset (gregset_t *gregsetp,
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int regno)
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{
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if (regno == -1)
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convert_to_gregset (gregsetp, registers, 0);
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else
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{
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signed char valid[NUM_GREGS];
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memset (valid, 0, sizeof (valid));
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valid[regno] = 1;
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convert_to_gregset (gregsetp, valid, valid);
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}
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}
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/* Where does st(N) start in the fpregset_t structure F? */
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#define FPREGSET_T_FPREG_OFFSET(f, n) \
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((char *) &(f)->st_space + (n) * 10)
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/* Fill GDB's register file with the floating-point register values in
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*FPREGSETP. */
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void
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supply_fpregset (fpregset_t *fpregsetp)
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{
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int i;
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/* Supply the floating-point registers. */
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for (i = 0; i < 8; i++)
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supply_register (FP0_REGNUM + i, FPREGSET_T_FPREG_OFFSET (fpregsetp, i));
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supply_register (FCTRL_REGNUM, (char *) &fpregsetp->cwd);
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supply_register (FSTAT_REGNUM, (char *) &fpregsetp->swd);
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supply_register (FTAG_REGNUM, (char *) &fpregsetp->twd);
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supply_register (FCOFF_REGNUM, (char *) &fpregsetp->fip);
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supply_register (FDS_REGNUM, (char *) &fpregsetp->fos);
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supply_register (FDOFF_REGNUM, (char *) &fpregsetp->foo);
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/* Extract the code segment and opcode from the "fcs" member. */
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{
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long l;
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l = fpregsetp->fcs & 0xffff;
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supply_register (FCS_REGNUM, (char *) &l);
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l = (fpregsetp->fcs >> 16) & ((1 << 11) - 1);
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supply_register (FOP_REGNUM, (char *) &l);
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}
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}
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/* Fill in an fpregset_t structure with selected data from a
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gdb-format register file.
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- FPREGSETP points to the structure to be filled.
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- GDB_REGS points to the GDB-style register file providing the data.
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- VALID is an array indicating which registers in GDB_REGS are
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valid; the parts of *FPREGSETP that would hold registers marked
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invalid in GDB_REGS are left unchanged. If VALID is zero, all
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registers are assumed to be valid. */
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void
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convert_to_fpregset (fpregset_t *fpregsetp,
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char *gdb_regs,
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signed char *valid)
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{
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int i;
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/* Fill in the floating-point registers. */
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for (i = 0; i < 8; i++)
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if (!valid || valid[i])
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memcpy (FPREGSET_T_FPREG_OFFSET (fpregsetp, i),
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®isters[REGISTER_BYTE (FP0_REGNUM + i)],
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REGISTER_RAW_SIZE(FP0_REGNUM + i));
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#define fill(MEMBER, REGNO) \
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if (! valid || valid[(REGNO)]) \
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memcpy (&fpregsetp->MEMBER, ®isters[REGISTER_BYTE (REGNO)], \
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sizeof (fpregsetp->MEMBER))
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fill (cwd, FCTRL_REGNUM);
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fill (swd, FSTAT_REGNUM);
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fill (twd, FTAG_REGNUM);
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fill (fip, FCOFF_REGNUM);
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fill (foo, FDOFF_REGNUM);
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fill (fos, FDS_REGNUM);
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#undef fill
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if (! valid || valid[FCS_REGNUM])
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fpregsetp->fcs
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= ((fpregsetp->fcs & ~0xffff)
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| (* (int *) ®isters[REGISTER_BYTE (FCS_REGNUM)] & 0xffff));
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if (! valid || valid[FOP_REGNUM])
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fpregsetp->fcs
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= ((fpregsetp->fcs & 0xffff)
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| ((*(int *) ®isters[REGISTER_BYTE (FOP_REGNUM)] & ((1 << 11) - 1))
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<< 16));
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}
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/* Given a pointer to a floating point register set in (fpregset_t *)
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format, update all of the registers from gdb's idea of the current
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floating point register set. */
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void
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fill_fpregset (fpregset_t *fpregsetp,
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int regno)
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{
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convert_to_fpregset (fpregsetp, registers, 0);
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}
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/* Get the whole floating point state of the process and store the
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floating point stack into registers[]. */
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static void
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fetch_fpregs ()
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{
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int ret, regno;
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fpregset_t buf;
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ret = ptrace (PTRACE_GETFPREGS, inferior_pid, 0, (int) &buf);
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if (ret < 0)
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{
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warning ("Couldn't get floating point status");
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return;
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}
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/* ptrace fills an fpregset_t, so we can use the same function we do
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for core files. */
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supply_fpregset (&buf);
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}
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/* Set the inferior's floating-point registers to the values in
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registers[] --- but only those registers marked valid. */
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static void
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store_fpregs ()
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{
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int ret;
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fpregset_t buf;
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ret = ptrace (PTRACE_GETFPREGS, inferior_pid, 0, (int) &buf);
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if (ret < 0)
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{
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warning ("Couldn't get floating point status");
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return;
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}
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convert_to_fpregset (&buf, registers, register_valid);
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ret = ptrace (PTRACE_SETFPREGS, inferior_pid, 0, (int) &buf);
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if (ret < 0)
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{
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warning ("Couldn't write floating point status");
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return;
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}
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}
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/* Read the general registers from the process, and store them
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in registers[]. */
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static void
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fetch_regs ()
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{
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int ret, regno;
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gregset_t buf;
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ret = ptrace (PTRACE_GETREGS, inferior_pid, 0, (int) &buf);
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if (ret < 0)
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{
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warning ("Couldn't get registers");
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return;
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}
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supply_gregset (&buf);
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}
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/* Set the inferior's general registers to the values in registers[]
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--- but only those registers marked as valid. */
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static void
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store_regs ()
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{
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int ret, regno;
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gregset_t buf;
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ret = ptrace (PTRACE_GETREGS, inferior_pid, 0, (int) &buf);
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if (ret < 0)
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{
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warning ("Couldn't get registers");
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return;
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}
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convert_to_gregset (&buf, registers, register_valid);
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ret = ptrace (PTRACE_SETREGS, inferior_pid, 0, (int)buf);
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if (ret < 0)
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{
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warning ("Couldn't write registers");
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return;
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}
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}
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/* Fetch registers from the child process.
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Fetch all if regno == -1, otherwise fetch all ordinary
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registers or all floating point registers depending
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upon the value of regno. */
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void
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fetch_inferior_registers (int regno)
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{
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if (regno < NUM_GREGS || regno == -1)
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fetch_regs ();
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if (regno >= NUM_GREGS || regno == -1)
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fetch_fpregs ();
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}
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/* Store our register values back into the inferior.
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If REGNO is -1, do this for all registers.
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Otherwise, REGNO specifies which register, which
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then determines whether we store all ordinary
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registers or all of the floating point registers. */
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void
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store_inferior_registers (regno)
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int regno;
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{
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if (regno < NUM_GREGS || regno == -1)
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store_regs ();
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if (regno >= NUM_GREGS || regno == -1)
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store_fpregs ();
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}
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/* Find the minimal symbol named NAME, and return both the minsym
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struct and its objfile. This probably ought to be in minsym.c, but
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everything there is trying to deal with things like C++ and
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SOFUN_ADDRESS_MAYBE_TURQUOISE, ... Since this is so simple, it may
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be considered too special-purpose for general consumption. */
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static struct minimal_symbol *
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find_minsym_and_objfile (char *name, struct objfile **objfile_p)
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{
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struct objfile *objfile;
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ALL_OBJFILES (objfile)
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{
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struct minimal_symbol *msym;
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ALL_OBJFILE_MSYMBOLS (objfile, msym)
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{
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if (SYMBOL_NAME (msym)
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&& STREQ (SYMBOL_NAME (msym), name))
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{
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*objfile_p = objfile;
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return msym;
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}
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}
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}
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return 0;
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}
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static CORE_ADDR
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skip_hurd_resolver (CORE_ADDR pc)
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{
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/* The HURD dynamic linker is part of the GNU C library, so many
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GNU/Linux distributions use it. (All ELF versions, as far as I
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know.) An unresolved PLT entry points to "_dl_runtime_resolve",
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which calls "fixup" to patch the PLT, and then passes control to
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the function.
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We look for the symbol `_dl_runtime_resolve', and find `fixup' in
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the same objfile. If we are at the entry point of `fixup', then
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we set a breakpoint at the return address (at the top of the
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stack), and continue.
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It's kind of gross to do all these checks every time we're
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called, since they don't change once the executable has gotten
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started. But this is only a temporary hack --- upcoming versions
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of Linux will provide a portable, efficient interface for
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debugging programs that use shared libraries. */
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struct objfile *objfile;
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struct minimal_symbol *resolver
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= find_minsym_and_objfile ("_dl_runtime_resolve", &objfile);
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if (resolver)
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{
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struct minimal_symbol *fixup
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= lookup_minimal_symbol ("fixup", 0, objfile);
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if (fixup && SYMBOL_VALUE_ADDRESS (fixup) == pc)
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return (SAVED_PC_AFTER_CALL (get_current_frame ()));
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}
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return 0;
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}
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/* See the comments for SKIP_SOLIB_RESOLVER at the top of infrun.c.
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This function:
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1) decides whether a PLT has sent us into the linker to resolve
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a function reference, and
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2) if so, tells us where to set a temporary breakpoint that will
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trigger when the dynamic linker is done. */
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CORE_ADDR
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i386_linux_skip_solib_resolver (CORE_ADDR pc)
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{
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CORE_ADDR result;
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/* Plug in functions for other kinds of resolvers here. */
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result = skip_hurd_resolver (pc);
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if (result)
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return result;
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return 0;
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}
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