379 lines
9.2 KiB
C
379 lines
9.2 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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/* FIXME: These routine absolutely depends upon (NUM_REGS - NUM_FREGS)
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being less than or equal to the number of registers that can be stored
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in a gregset_t. Note that with the current scheme there will typically
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be more registers actually stored in a gregset_t that what we know
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about. This is bogus and should be fixed. */
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/* Given a pointer to a general register set in /proc format (gregset_t *),
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unpack the register contents and supply them as gdb's idea of the current
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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_REGS - NUM_FREGS) ; 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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void
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fill_gregset (gregsetp, regno)
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gregset_t *gregsetp;
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int regno;
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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_REGS - NUM_FREGS) ; regi++)
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{
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if ((regno == -1) || (regno == regi))
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{
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*(regp + regmap[regi]) = *(int *) ®isters[REGISTER_BYTE (regi)];
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}
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}
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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, unpack the register contents and supply them as gdb's
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idea of the current floating point register values. */
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void
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supply_fpregset (fpregsetp)
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fpregset_t *fpregsetp;
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{
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register int regi;
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char *from;
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from = (char *) &(fpregsetp->st_space[0]);
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for (regi = FPSTART_REGNUM ; regi <= FPEND_REGNUM ; regi++)
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{
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supply_register(regi, from);
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from += REGISTER_RAW_SIZE(regi);
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}
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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
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of the current floating point register set. */
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void
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fill_fpregset (fpregsetp, regno)
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fpregset_t *fpregsetp;
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int regno;
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{
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int regi;
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char *to;
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char *from;
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to = (char *) &(fpregsetp->st_space[0]);
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for (regi = FPSTART_REGNUM ; regi <= FPEND_REGNUM ; regi++)
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{
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from = (char *) ®isters[REGISTER_BYTE (regi)];
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memcpy (to, from, REGISTER_RAW_SIZE (regi));
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to += REGISTER_RAW_SIZE(regi);
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}
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}
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/*
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Get the whole floating point state of the process and
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store the floating point stack into registers[].
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*/
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static void
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fetch_fpregs(void)
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{
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int ret, regno;
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char buf[FPREG_BYTES];
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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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for ( regno = 0; regno < NUM_FREGS; regno++ )
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{
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if ( regno < 7 )
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supply_register (NUM_REGS-NUM_FREGS+regno, buf + regno*4);
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else
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supply_register (NUM_REGS-NUM_FREGS+regno,
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buf + FPENV_BYTES + (regno-7)*FPREG_RAW_SIZE);
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}
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}
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/*
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Get the whole floating point state of the process and
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replace the contents from registers[].
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*/
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static void
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store_fpregs(void)
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{
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int ret, regno;
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char buf[FPREG_BYTES];
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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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for ( regno = 0; regno < NUM_FREGS; regno++ )
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{
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if ( register_valid[regno] )
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{
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if ( regno < 7 )
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{
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read_register_gen (NUM_REGS-NUM_FREGS+regno,
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buf + regno*4);
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}
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else
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{
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read_register_gen (NUM_REGS-NUM_FREGS+regno,
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buf + FPENV_BYTES + (regno-7)*FPREG_RAW_SIZE);
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}
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}
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}
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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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/*
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Get state of all non-fp registers of the process and
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store into registers[].
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*/
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static void
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fetch_regs(void)
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{
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int ret, regno;
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char buf[17*sizeof(unsigned int)];
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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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for ( regno = 0; regno < NUM_REGS-NUM_FREGS; regno++ )
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supply_register (regno, buf + register_addr (regno, U_REGS_OFFSET));
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}
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/*
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Get the whole non-floating-point register state of the process and
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replace them in the process from registers[].
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*/
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static void
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store_regs(void)
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{
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int ret, regno;
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char buf[17*sizeof(unsigned int)];
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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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for ( regno = 0; regno < NUM_REGS-NUM_FREGS; regno++ )
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{
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if ( register_valid[regno] )
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read_register_gen (regno, buf + register_addr (regno, U_REGS_OFFSET));
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}
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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 floating point status");
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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 (regno)
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int regno;
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{
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if ( (regno < NUM_REGS - NUM_FREGS) || (regno == -1) )
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fetch_regs();
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if ( (regno >= NUM_REGS - NUM_FREGS) || (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_REGS - NUM_FREGS) || (regno == -1) )
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store_regs();
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if ( (regno >= NUM_REGS - NUM_FREGS) || (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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