1999-09-09 02:02:17 +02:00
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/* 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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1999-11-02 05:44:47 +01:00
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/* Which ptrace request retrieves which registers?
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These apply to the corresponding SET requests as well. */
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#define GETREGS_SUPPLIES(regno) \
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(0 <= (regno) && (regno) <= 15)
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#define GETFPREGS_SUPPLIES(regno) \
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(FP0_REGNUM <= (regno) && (regno) <= LAST_FPU_CTRL_REGNUM)
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#define GETXFPREGS_SUPPLIES(regno) \
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(FP0_REGNUM <= (regno) && (regno) <= MXCSR_REGNUM)
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/* Does the current host support the GETXFPREGS request? The header
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file may or may not define it, and even if it is defined, the
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kernel will return EIO if it's running on a pre-SSE processor.
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My instinct is to attach this to some architecture- or
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target-specific data structure, but really, a particular GDB
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process can only run on top of one kernel at a time. So it's okay
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for this to be a simple variable. */
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int have_ptrace_getxfpregs =
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#ifdef HAVE_PTRACE_GETXFPREGS
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1
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#else
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0
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#endif
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;
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/* Transfering the general registers between GDB, inferiors and core files. */
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1999-10-19 04:47:02 +02:00
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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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1999-09-09 02:02:17 +02:00
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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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1999-10-19 04:47:02 +02:00
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for (regi = 0; regi < NUM_GREGS; regi++)
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1999-09-09 02:02:17 +02:00
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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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1999-11-02 05:44:47 +01:00
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1999-10-19 04:47:02 +02:00
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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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1999-09-09 02:02:17 +02:00
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void
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1999-10-19 04:47:02 +02:00
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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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1999-09-09 02:02:17 +02:00
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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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1999-10-19 04:47:02 +02:00
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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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1999-11-02 05:44:47 +01:00
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/* Store GDB's value for REGNO in *GREGSETP. If REGNO is -1, do all
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of them. */
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1999-10-19 04:47:02 +02:00
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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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1999-09-09 02:02:17 +02:00
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{
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1999-10-19 04:47:02 +02:00
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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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1999-09-09 02:02:17 +02:00
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}
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}
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1999-11-02 05:44:47 +01:00
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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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/* Transfering floating-point registers between GDB, inferiors and cores. */
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/* What is the address of st(N) within the fpregset_t structure F? */
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#define FPREGSET_T_FPREG_ADDR(f, n) \
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1999-10-19 04:47:02 +02:00
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((char *) &(f)->st_space + (n) * 10)
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1999-09-09 02:02:17 +02:00
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1999-10-19 04:47:02 +02:00
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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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1999-09-09 02:02:17 +02:00
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void
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1999-10-19 04:47:02 +02:00
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supply_fpregset (fpregset_t *fpregsetp)
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1999-09-09 02:02:17 +02:00
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{
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1999-10-19 04:47:02 +02:00
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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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1999-11-02 05:44:47 +01:00
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supply_register (FP0_REGNUM + i, FPREGSET_T_FPREG_ADDR (fpregsetp, i));
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1999-10-19 04:47:02 +02:00
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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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1999-09-09 02:02:17 +02:00
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}
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1999-10-19 04:47:02 +02:00
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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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1999-09-09 02:02:17 +02:00
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void
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1999-10-19 04:47:02 +02:00
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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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1999-09-09 02:02:17 +02:00
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{
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1999-10-19 04:47:02 +02:00
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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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1999-11-02 05:44:47 +01:00
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memcpy (FPREGSET_T_FPREG_ADDR (fpregsetp, i),
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1999-10-19 04:47:02 +02:00
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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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1999-09-09 02:02:17 +02:00
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1999-10-19 04:47:02 +02:00
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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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1999-09-09 02:02:17 +02:00
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}
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1999-10-19 04:47:02 +02:00
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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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1999-09-09 02:02:17 +02:00
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static void
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1999-10-19 04:47:02 +02:00
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fetch_fpregs ()
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1999-09-09 02:02:17 +02:00
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{
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int ret, regno;
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1999-10-19 04:47:02 +02:00
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fpregset_t buf;
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1999-09-09 02:02:17 +02:00
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1999-10-19 04:47:02 +02:00
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ret = ptrace (PTRACE_GETFPREGS, inferior_pid, 0, (int) &buf);
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if (ret < 0)
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1999-09-09 02:02:17 +02:00
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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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1999-10-19 04:47:02 +02:00
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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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1999-09-09 02:02:17 +02:00
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}
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1999-10-19 04:47:02 +02:00
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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. */
|
1999-09-09 02:02:17 +02:00
|
|
|
|
static void
|
1999-10-19 04:47:02 +02:00
|
|
|
|
store_fpregs ()
|
1999-09-09 02:02:17 +02:00
|
|
|
|
{
|
1999-10-19 04:47:02 +02:00
|
|
|
|
int ret;
|
|
|
|
|
fpregset_t buf;
|
1999-09-09 02:02:17 +02:00
|
|
|
|
|
1999-10-19 04:47:02 +02:00
|
|
|
|
ret = ptrace (PTRACE_GETFPREGS, inferior_pid, 0, (int) &buf);
|
|
|
|
|
if (ret < 0)
|
1999-09-09 02:02:17 +02:00
|
|
|
|
{
|
|
|
|
|
warning ("Couldn't get floating point status");
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
|
1999-10-19 04:47:02 +02:00
|
|
|
|
convert_to_fpregset (&buf, registers, register_valid);
|
1999-09-09 02:02:17 +02:00
|
|
|
|
|
1999-10-19 04:47:02 +02:00
|
|
|
|
ret = ptrace (PTRACE_SETFPREGS, inferior_pid, 0, (int) &buf);
|
|
|
|
|
if (ret < 0)
|
1999-09-09 02:02:17 +02:00
|
|
|
|
{
|
|
|
|
|
warning ("Couldn't write floating point status");
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
1999-11-02 05:44:47 +01:00
|
|
|
|
|
|
|
|
|
/* Transfering floating-point and SSE registers to and from GDB. */
|
1999-09-09 02:02:17 +02:00
|
|
|
|
|
1999-11-02 05:44:47 +01:00
|
|
|
|
|
1999-11-09 02:23:30 +01:00
|
|
|
|
/* PTRACE_GETXFPREGS is a Cygnus invention, since we wrote our own
|
|
|
|
|
Linux kernel patch for SSE support. That patch may or may not
|
|
|
|
|
actually make it into the official distribution. If you find that
|
|
|
|
|
years have gone by since this code was added, and Linux isn't using
|
|
|
|
|
PTRACE_GETXFPREGS, that means that our patch didn't make it, and
|
|
|
|
|
you can delete this code. */
|
|
|
|
|
|
1999-11-02 05:44:47 +01:00
|
|
|
|
#ifdef HAVE_PTRACE_GETXFPREGS
|
1999-09-09 02:02:17 +02:00
|
|
|
|
static void
|
1999-11-02 05:44:47 +01:00
|
|
|
|
supply_xfpregset (struct user_xfpregs_struct *xfpregs)
|
1999-09-09 02:02:17 +02:00
|
|
|
|
{
|
1999-11-02 05:44:47 +01:00
|
|
|
|
int reg;
|
1999-09-09 02:02:17 +02:00
|
|
|
|
|
1999-11-02 05:44:47 +01:00
|
|
|
|
/* Supply the floating-point registers. */
|
|
|
|
|
for (reg = 0; reg < 8; reg++)
|
|
|
|
|
supply_register (FP0_REGNUM + reg, (char *) &xfpregs->st_space[reg]);
|
|
|
|
|
|
|
|
|
|
{
|
|
|
|
|
supply_register (FCTRL_REGNUM, (char *) &xfpregs->cwd);
|
|
|
|
|
supply_register (FSTAT_REGNUM, (char *) &xfpregs->swd);
|
|
|
|
|
supply_register (FTAG_REGNUM, (char *) &xfpregs->twd);
|
|
|
|
|
supply_register (FCOFF_REGNUM, (char *) &xfpregs->fip);
|
|
|
|
|
supply_register (FDS_REGNUM, (char *) &xfpregs->fos);
|
|
|
|
|
supply_register (FDOFF_REGNUM, (char *) &xfpregs->foo);
|
|
|
|
|
|
|
|
|
|
/* Extract the code segment and opcode from the "fcs" member. */
|
1999-09-09 02:02:17 +02:00
|
|
|
|
{
|
1999-11-02 05:44:47 +01:00
|
|
|
|
long l;
|
|
|
|
|
|
|
|
|
|
l = xfpregs->fcs & 0xffff;
|
|
|
|
|
supply_register (FCS_REGNUM, (char *) &l);
|
|
|
|
|
|
|
|
|
|
l = (xfpregs->fcs >> 16) & ((1 << 11) - 1);
|
|
|
|
|
supply_register (FOP_REGNUM, (char *) &l);
|
1999-09-09 02:02:17 +02:00
|
|
|
|
}
|
1999-11-02 05:44:47 +01:00
|
|
|
|
}
|
1999-09-09 02:02:17 +02:00
|
|
|
|
|
1999-11-02 05:44:47 +01:00
|
|
|
|
/* Supply the SSE registers. */
|
|
|
|
|
for (reg = 0; reg < 8; reg++)
|
|
|
|
|
supply_register (XMM0_REGNUM + reg, (char *) &xfpregs->xmm_space[reg]);
|
|
|
|
|
supply_register (MXCSR_REGNUM, (char *) &xfpregs->mxcsr);
|
1999-09-09 02:02:17 +02:00
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
static void
|
1999-11-02 05:44:47 +01:00
|
|
|
|
convert_to_xfpregset (struct user_xfpregs_struct *xfpregs,
|
|
|
|
|
char *gdb_regs,
|
|
|
|
|
signed char *valid)
|
1999-09-09 02:02:17 +02:00
|
|
|
|
{
|
1999-11-02 05:44:47 +01:00
|
|
|
|
int reg;
|
1999-09-09 02:02:17 +02:00
|
|
|
|
|
1999-11-02 05:44:47 +01:00
|
|
|
|
/* Fill in the floating-point registers. */
|
|
|
|
|
for (reg = 0; reg < 8; reg++)
|
|
|
|
|
if (!valid || valid[reg])
|
|
|
|
|
memcpy (&xfpregs->st_space[reg],
|
|
|
|
|
®isters[REGISTER_BYTE (FP0_REGNUM + reg)],
|
|
|
|
|
REGISTER_RAW_SIZE(FP0_REGNUM + reg));
|
|
|
|
|
|
|
|
|
|
#define fill(MEMBER, REGNO) \
|
|
|
|
|
if (! valid || valid[(REGNO)]) \
|
|
|
|
|
memcpy (&xfpregs->MEMBER, ®isters[REGISTER_BYTE (REGNO)], \
|
|
|
|
|
sizeof (xfpregs->MEMBER))
|
|
|
|
|
|
|
|
|
|
fill (cwd, FCTRL_REGNUM);
|
|
|
|
|
fill (swd, FSTAT_REGNUM);
|
|
|
|
|
fill (twd, FTAG_REGNUM);
|
|
|
|
|
fill (fip, FCOFF_REGNUM);
|
|
|
|
|
fill (foo, FDOFF_REGNUM);
|
|
|
|
|
fill (fos, FDS_REGNUM);
|
|
|
|
|
|
|
|
|
|
#undef fill
|
|
|
|
|
|
|
|
|
|
if (! valid || valid[FCS_REGNUM])
|
|
|
|
|
xfpregs->fcs
|
|
|
|
|
= ((xfpregs->fcs & ~0xffff)
|
|
|
|
|
| (* (int *) ®isters[REGISTER_BYTE (FCS_REGNUM)] & 0xffff));
|
|
|
|
|
|
|
|
|
|
if (! valid || valid[FOP_REGNUM])
|
|
|
|
|
xfpregs->fcs
|
|
|
|
|
= ((xfpregs->fcs & 0xffff)
|
|
|
|
|
| ((*(int *) ®isters[REGISTER_BYTE (FOP_REGNUM)] & ((1 << 11) - 1))
|
|
|
|
|
<< 16));
|
|
|
|
|
|
|
|
|
|
/* Fill in the XMM registers. */
|
|
|
|
|
for (reg = 0; reg < 8; reg++)
|
|
|
|
|
if (! valid || valid[reg])
|
|
|
|
|
memcpy (&xfpregs->xmm_space[reg],
|
|
|
|
|
®isters[REGISTER_BYTE (XMM0_REGNUM + reg)],
|
|
|
|
|
REGISTER_RAW_SIZE (XMM0_REGNUM + reg));
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* Make a PTRACE_GETXFPREGS request, and supply all the register
|
|
|
|
|
values that yields to GDB. */
|
|
|
|
|
static int
|
|
|
|
|
fetch_xfpregs ()
|
|
|
|
|
{
|
|
|
|
|
int ret;
|
|
|
|
|
struct user_xfpregs_struct xfpregs;
|
|
|
|
|
|
|
|
|
|
if (! have_ptrace_getxfpregs)
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
|
|
ret = ptrace (PTRACE_GETXFPREGS, inferior_pid, 0, &xfpregs);
|
|
|
|
|
if (ret == -1)
|
1999-09-09 02:02:17 +02:00
|
|
|
|
{
|
1999-11-02 05:44:47 +01:00
|
|
|
|
if (errno == EIO)
|
|
|
|
|
{
|
|
|
|
|
have_ptrace_getxfpregs = 0;
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
warning ("couldn't read floating-point and SSE registers.");
|
|
|
|
|
return 0;
|
1999-09-09 02:02:17 +02:00
|
|
|
|
}
|
|
|
|
|
|
1999-11-02 05:44:47 +01:00
|
|
|
|
supply_xfpregset (&xfpregs);
|
|
|
|
|
return 1;
|
|
|
|
|
}
|
1999-09-09 02:02:17 +02:00
|
|
|
|
|
1999-11-02 05:44:47 +01:00
|
|
|
|
|
|
|
|
|
/* Send all the valid register values in GDB's register file covered
|
|
|
|
|
by the PTRACE_SETXFPREGS request to the inferior. */
|
|
|
|
|
static int
|
|
|
|
|
store_xfpregs ()
|
|
|
|
|
{
|
|
|
|
|
int ret;
|
|
|
|
|
struct user_xfpregs_struct xfpregs;
|
|
|
|
|
|
|
|
|
|
if (! have_ptrace_getxfpregs)
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
|
|
ret = ptrace (PTRACE_GETXFPREGS, inferior_pid, 0, &xfpregs);
|
|
|
|
|
if (ret == -1)
|
1999-09-09 02:02:17 +02:00
|
|
|
|
{
|
1999-11-02 05:44:47 +01:00
|
|
|
|
if (errno == EIO)
|
|
|
|
|
{
|
|
|
|
|
have_ptrace_getxfpregs = 0;
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
warning ("couldn't read floating-point and SSE registers.");
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
convert_to_xfpregset (&xfpregs, registers, register_valid);
|
|
|
|
|
|
|
|
|
|
if (ptrace (PTRACE_SETXFPREGS, inferior_pid, 0, &xfpregs) < 0)
|
|
|
|
|
{
|
|
|
|
|
warning ("Couldn't write floating-point and SSE registers.");
|
|
|
|
|
return 0;
|
1999-09-09 02:02:17 +02:00
|
|
|
|
}
|
1999-11-02 05:44:47 +01:00
|
|
|
|
|
|
|
|
|
return 1;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* Fill the XMM registers in the register file with dummy values. For
|
|
|
|
|
cases where we don't have access to the XMM registers. I think
|
|
|
|
|
this is cleaner than printing a warning. For a cleaner solution,
|
|
|
|
|
we should gdbarchify the i386 family. */
|
|
|
|
|
static void
|
|
|
|
|
dummy_sse_values ()
|
|
|
|
|
{
|
|
|
|
|
/* C doesn't have a syntax for NaN's, so write it out as an array of
|
|
|
|
|
longs. */
|
|
|
|
|
static long dummy[4] = { 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff };
|
|
|
|
|
static long mxcsr = 0x1f80;
|
|
|
|
|
int reg;
|
|
|
|
|
|
|
|
|
|
for (reg = 0; reg < 8; reg++)
|
|
|
|
|
supply_register (XMM0_REGNUM + reg, (char *) dummy);
|
|
|
|
|
supply_register (MXCSR_REGNUM, (char *) &mxcsr);
|
1999-09-09 02:02:17 +02:00
|
|
|
|
}
|
|
|
|
|
|
1999-11-02 05:44:47 +01:00
|
|
|
|
#else
|
|
|
|
|
|
|
|
|
|
/* Stub versions of the above routines, for systems that don't have
|
|
|
|
|
PTRACE_GETXFPREGS. */
|
|
|
|
|
static int store_xfpregs () { return 0; }
|
|
|
|
|
static int fetch_xfpregs () { return 0; }
|
|
|
|
|
static void dummy_sse_values () {}
|
|
|
|
|
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* Transferring arbitrary registers between GDB and inferior. */
|
1999-09-09 02:02:17 +02:00
|
|
|
|
|
|
|
|
|
/* Fetch registers from the child process.
|
|
|
|
|
Fetch all if regno == -1, otherwise fetch all ordinary
|
|
|
|
|
registers or all floating point registers depending
|
|
|
|
|
upon the value of regno. */
|
|
|
|
|
|
|
|
|
|
void
|
1999-10-19 04:47:02 +02:00
|
|
|
|
fetch_inferior_registers (int regno)
|
1999-09-09 02:02:17 +02:00
|
|
|
|
{
|
1999-11-02 05:44:47 +01:00
|
|
|
|
/* Use the xfpregs requests whenever possible, since they transfer
|
|
|
|
|
more registers in one system call, and we'll cache the results.
|
|
|
|
|
But remember that fetch_xfpregs can fail, and return zero. */
|
|
|
|
|
if (regno == -1)
|
|
|
|
|
{
|
|
|
|
|
fetch_regs ();
|
|
|
|
|
if (fetch_xfpregs ())
|
|
|
|
|
return;
|
|
|
|
|
fetch_fpregs ();
|
|
|
|
|
return;
|
|
|
|
|
}
|
1999-09-09 02:02:17 +02:00
|
|
|
|
|
1999-11-02 05:44:47 +01:00
|
|
|
|
if (GETREGS_SUPPLIES (regno))
|
|
|
|
|
{
|
|
|
|
|
fetch_regs ();
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (GETXFPREGS_SUPPLIES (regno))
|
|
|
|
|
{
|
|
|
|
|
if (fetch_xfpregs ())
|
|
|
|
|
return;
|
|
|
|
|
|
|
|
|
|
/* Either our processor or our kernel doesn't support the SSE
|
|
|
|
|
registers, so read the FP registers in the traditional way,
|
|
|
|
|
and fill the SSE registers with dummy values. It would be
|
|
|
|
|
more graceful to handle differences in the register set using
|
|
|
|
|
gdbarch. Until then, this will at least make things work
|
|
|
|
|
plausibly. */
|
|
|
|
|
fetch_fpregs ();
|
|
|
|
|
dummy_sse_values ();
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
internal_error ("i386-linux-nat.c (fetch_inferior_registers): "
|
|
|
|
|
"got request for bad register number %d", regno);
|
1999-09-09 02:02:17 +02:00
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* Store our register values back into the inferior.
|
|
|
|
|
If REGNO is -1, do this for all registers.
|
|
|
|
|
Otherwise, REGNO specifies which register, which
|
|
|
|
|
then determines whether we store all ordinary
|
|
|
|
|
registers or all of the floating point registers. */
|
|
|
|
|
|
|
|
|
|
void
|
|
|
|
|
store_inferior_registers (regno)
|
|
|
|
|
int regno;
|
|
|
|
|
{
|
1999-11-02 05:44:47 +01:00
|
|
|
|
/* Use the xfpregs requests whenever possible, since they transfer
|
|
|
|
|
more registers in one system call. But remember that
|
|
|
|
|
fetch_xfpregs can fail, and return zero. */
|
|
|
|
|
if (regno == -1)
|
|
|
|
|
{
|
|
|
|
|
store_regs ();
|
|
|
|
|
if (store_xfpregs ())
|
|
|
|
|
return;
|
|
|
|
|
store_fpregs ();
|
|
|
|
|
return;
|
|
|
|
|
}
|
1999-09-09 02:02:17 +02:00
|
|
|
|
|
1999-11-02 05:44:47 +01:00
|
|
|
|
if (GETREGS_SUPPLIES (regno))
|
|
|
|
|
{
|
|
|
|
|
store_regs ();
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (GETXFPREGS_SUPPLIES (regno))
|
|
|
|
|
{
|
|
|
|
|
if (store_xfpregs ())
|
|
|
|
|
return;
|
|
|
|
|
|
|
|
|
|
/* Either our processor or our kernel doesn't support the SSE
|
|
|
|
|
registers, so just write the FP registers in the traditional way. */
|
|
|
|
|
store_fpregs ();
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
internal_error ("i386-linux-nat.c (store_inferior_registers): "
|
|
|
|
|
"got request to store bad register number %d", regno);
|
1999-09-09 02:02:17 +02:00
|
|
|
|
}
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|
|
|
|
|
|
|
|
|
|
1999-11-02 05:44:47 +01:00
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|
|
|
|
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|
|
|
/* Calling functions in shared libraries. */
|
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|
|
|
|
1999-09-09 02:02:17 +02:00
|
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|
|
/* Find the minimal symbol named NAME, and return both the minsym
|
|
|
|
|
struct and its objfile. This probably ought to be in minsym.c, but
|
|
|
|
|
everything there is trying to deal with things like C++ and
|
|
|
|
|
SOFUN_ADDRESS_MAYBE_TURQUOISE, ... Since this is so simple, it may
|
|
|
|
|
be considered too special-purpose for general consumption. */
|
|
|
|
|
|
|
|
|
|
static struct minimal_symbol *
|
|
|
|
|
find_minsym_and_objfile (char *name, struct objfile **objfile_p)
|
|
|
|
|
{
|
|
|
|
|
struct objfile *objfile;
|
|
|
|
|
|
|
|
|
|
ALL_OBJFILES (objfile)
|
|
|
|
|
{
|
|
|
|
|
struct minimal_symbol *msym;
|
|
|
|
|
|
|
|
|
|
ALL_OBJFILE_MSYMBOLS (objfile, msym)
|
|
|
|
|
{
|
|
|
|
|
if (SYMBOL_NAME (msym)
|
|
|
|
|
&& STREQ (SYMBOL_NAME (msym), name))
|
|
|
|
|
{
|
|
|
|
|
*objfile_p = objfile;
|
|
|
|
|
return msym;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
static CORE_ADDR
|
|
|
|
|
skip_hurd_resolver (CORE_ADDR pc)
|
|
|
|
|
{
|
|
|
|
|
/* The HURD dynamic linker is part of the GNU C library, so many
|
|
|
|
|
GNU/Linux distributions use it. (All ELF versions, as far as I
|
|
|
|
|
know.) An unresolved PLT entry points to "_dl_runtime_resolve",
|
|
|
|
|
which calls "fixup" to patch the PLT, and then passes control to
|
|
|
|
|
the function.
|
|
|
|
|
|
|
|
|
|
We look for the symbol `_dl_runtime_resolve', and find `fixup' in
|
|
|
|
|
the same objfile. If we are at the entry point of `fixup', then
|
|
|
|
|
we set a breakpoint at the return address (at the top of the
|
|
|
|
|
stack), and continue.
|
|
|
|
|
|
|
|
|
|
It's kind of gross to do all these checks every time we're
|
|
|
|
|
called, since they don't change once the executable has gotten
|
|
|
|
|
started. But this is only a temporary hack --- upcoming versions
|
|
|
|
|
of Linux will provide a portable, efficient interface for
|
|
|
|
|
debugging programs that use shared libraries. */
|
|
|
|
|
|
|
|
|
|
struct objfile *objfile;
|
|
|
|
|
struct minimal_symbol *resolver
|
|
|
|
|
= find_minsym_and_objfile ("_dl_runtime_resolve", &objfile);
|
|
|
|
|
|
|
|
|
|
if (resolver)
|
|
|
|
|
{
|
|
|
|
|
struct minimal_symbol *fixup
|
|
|
|
|
= lookup_minimal_symbol ("fixup", 0, objfile);
|
|
|
|
|
|
|
|
|
|
if (fixup && SYMBOL_VALUE_ADDRESS (fixup) == pc)
|
|
|
|
|
return (SAVED_PC_AFTER_CALL (get_current_frame ()));
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* See the comments for SKIP_SOLIB_RESOLVER at the top of infrun.c.
|
|
|
|
|
This function:
|
|
|
|
|
1) decides whether a PLT has sent us into the linker to resolve
|
|
|
|
|
a function reference, and
|
|
|
|
|
2) if so, tells us where to set a temporary breakpoint that will
|
|
|
|
|
trigger when the dynamic linker is done. */
|
|
|
|
|
|
|
|
|
|
CORE_ADDR
|
|
|
|
|
i386_linux_skip_solib_resolver (CORE_ADDR pc)
|
|
|
|
|
{
|
|
|
|
|
CORE_ADDR result;
|
|
|
|
|
|
|
|
|
|
/* Plug in functions for other kinds of resolvers here. */
|
|
|
|
|
result = skip_hurd_resolver (pc);
|
|
|
|
|
if (result)
|
|
|
|
|
return result;
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|