mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-03 04:12:10 +08:00
409 lines
11 KiB
C
409 lines
11 KiB
C
/* Native-dependent code for Linux running on i386's, for GDB.
|
|
|
|
This file is part of GDB.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
|
|
|
|
#include "defs.h"
|
|
#include "inferior.h"
|
|
#include "gdbcore.h"
|
|
|
|
/* For i386_linux_skip_solib_resolver */
|
|
#include "symtab.h"
|
|
#include "frame.h"
|
|
#include "symfile.h"
|
|
#include "objfiles.h"
|
|
|
|
#include <sys/ptrace.h>
|
|
#include <sys/user.h>
|
|
#include <sys/procfs.h>
|
|
|
|
#ifdef HAVE_SYS_REG_H
|
|
#include <sys/reg.h>
|
|
#endif
|
|
|
|
/* This is a duplicate of the table in i386-xdep.c. */
|
|
|
|
static int regmap[] =
|
|
{
|
|
EAX, ECX, EDX, EBX,
|
|
UESP, EBP, ESI, EDI,
|
|
EIP, EFL, CS, SS,
|
|
DS, ES, FS, GS,
|
|
};
|
|
|
|
|
|
/* Given a pointer to a general register set in struct user format
|
|
(gregset_t *), unpack the register contents and supply them as
|
|
gdb's idea of the current register values. */
|
|
void
|
|
supply_gregset (gregsetp)
|
|
gregset_t *gregsetp;
|
|
{
|
|
register int regi;
|
|
register greg_t *regp = (greg_t *) gregsetp;
|
|
|
|
for (regi = 0; regi < NUM_GREGS; regi++)
|
|
{
|
|
supply_register (regi, (char *) (regp + regmap[regi]));
|
|
}
|
|
}
|
|
|
|
/* Fill in a gregset_t object with selected data from a gdb-format
|
|
register file.
|
|
- GREGSETP points to the gregset_t object to be filled.
|
|
- GDB_REGS points to the GDB-style register file providing the data.
|
|
- VALID is an array indicating which registers in GDB_REGS are
|
|
valid; the parts of *GREGSETP that would hold registers marked
|
|
invalid in GDB_REGS are left unchanged. If VALID is zero, all
|
|
registers are assumed to be valid. */
|
|
void
|
|
convert_to_gregset (gregset_t *gregsetp,
|
|
char *gdb_regs,
|
|
signed char *valid)
|
|
{
|
|
int regi;
|
|
register greg_t *regp = (greg_t *) gregsetp;
|
|
|
|
for (regi = 0; regi < NUM_GREGS; regi++)
|
|
if (! valid || valid[regi])
|
|
*(regp + regmap[regi]) = * (int *) ®isters[REGISTER_BYTE (regi)];
|
|
}
|
|
|
|
void
|
|
fill_gregset (gregset_t *gregsetp,
|
|
int regno)
|
|
{
|
|
if (regno == -1)
|
|
convert_to_gregset (gregsetp, registers, 0);
|
|
else
|
|
{
|
|
signed char valid[NUM_GREGS];
|
|
memset (valid, 0, sizeof (valid));
|
|
valid[regno] = 1;
|
|
convert_to_gregset (gregsetp, valid, valid);
|
|
}
|
|
}
|
|
|
|
|
|
/* Where does st(N) start in the fpregset_t structure F? */
|
|
#define FPREGSET_T_FPREG_OFFSET(f, n) \
|
|
((char *) &(f)->st_space + (n) * 10)
|
|
|
|
/* Fill GDB's register file with the floating-point register values in
|
|
*FPREGSETP. */
|
|
void
|
|
supply_fpregset (fpregset_t *fpregsetp)
|
|
{
|
|
int i;
|
|
|
|
/* Supply the floating-point registers. */
|
|
for (i = 0; i < 8; i++)
|
|
supply_register (FP0_REGNUM + i, FPREGSET_T_FPREG_OFFSET (fpregsetp, i));
|
|
|
|
supply_register (FCTRL_REGNUM, (char *) &fpregsetp->cwd);
|
|
supply_register (FSTAT_REGNUM, (char *) &fpregsetp->swd);
|
|
supply_register (FTAG_REGNUM, (char *) &fpregsetp->twd);
|
|
supply_register (FCOFF_REGNUM, (char *) &fpregsetp->fip);
|
|
supply_register (FDS_REGNUM, (char *) &fpregsetp->fos);
|
|
supply_register (FDOFF_REGNUM, (char *) &fpregsetp->foo);
|
|
|
|
/* Extract the code segment and opcode from the "fcs" member. */
|
|
{
|
|
long l;
|
|
|
|
l = fpregsetp->fcs & 0xffff;
|
|
supply_register (FCS_REGNUM, (char *) &l);
|
|
|
|
l = (fpregsetp->fcs >> 16) & ((1 << 11) - 1);
|
|
supply_register (FOP_REGNUM, (char *) &l);
|
|
}
|
|
}
|
|
|
|
|
|
/* Fill in an fpregset_t structure with selected data from a
|
|
gdb-format register file.
|
|
- FPREGSETP points to the structure to be filled.
|
|
- GDB_REGS points to the GDB-style register file providing the data.
|
|
- VALID is an array indicating which registers in GDB_REGS are
|
|
valid; the parts of *FPREGSETP that would hold registers marked
|
|
invalid in GDB_REGS are left unchanged. If VALID is zero, all
|
|
registers are assumed to be valid. */
|
|
void
|
|
convert_to_fpregset (fpregset_t *fpregsetp,
|
|
char *gdb_regs,
|
|
signed char *valid)
|
|
{
|
|
int i;
|
|
|
|
/* Fill in the floating-point registers. */
|
|
for (i = 0; i < 8; i++)
|
|
if (!valid || valid[i])
|
|
memcpy (FPREGSET_T_FPREG_OFFSET (fpregsetp, i),
|
|
®isters[REGISTER_BYTE (FP0_REGNUM + i)],
|
|
REGISTER_RAW_SIZE(FP0_REGNUM + i));
|
|
|
|
#define fill(MEMBER, REGNO) \
|
|
if (! valid || valid[(REGNO)]) \
|
|
memcpy (&fpregsetp->MEMBER, ®isters[REGISTER_BYTE (REGNO)], \
|
|
sizeof (fpregsetp->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])
|
|
fpregsetp->fcs
|
|
= ((fpregsetp->fcs & ~0xffff)
|
|
| (* (int *) ®isters[REGISTER_BYTE (FCS_REGNUM)] & 0xffff));
|
|
|
|
if (! valid || valid[FOP_REGNUM])
|
|
fpregsetp->fcs
|
|
= ((fpregsetp->fcs & 0xffff)
|
|
| ((*(int *) ®isters[REGISTER_BYTE (FOP_REGNUM)] & ((1 << 11) - 1))
|
|
<< 16));
|
|
}
|
|
|
|
|
|
/* Given a pointer to a floating point register set in (fpregset_t *)
|
|
format, update all of the registers from gdb's idea of the current
|
|
floating point register set. */
|
|
|
|
void
|
|
fill_fpregset (fpregset_t *fpregsetp,
|
|
int regno)
|
|
{
|
|
convert_to_fpregset (fpregsetp, registers, 0);
|
|
}
|
|
|
|
|
|
/* Get the whole floating point state of the process and store the
|
|
floating point stack into registers[]. */
|
|
static void
|
|
fetch_fpregs ()
|
|
{
|
|
int ret, regno;
|
|
fpregset_t buf;
|
|
|
|
ret = ptrace (PTRACE_GETFPREGS, inferior_pid, 0, (int) &buf);
|
|
if (ret < 0)
|
|
{
|
|
warning ("Couldn't get floating point status");
|
|
return;
|
|
}
|
|
|
|
/* ptrace fills an fpregset_t, so we can use the same function we do
|
|
for core files. */
|
|
supply_fpregset (&buf);
|
|
}
|
|
|
|
|
|
/* Set the inferior's floating-point registers to the values in
|
|
registers[] --- but only those registers marked valid. */
|
|
static void
|
|
store_fpregs ()
|
|
{
|
|
int ret;
|
|
fpregset_t buf;
|
|
|
|
ret = ptrace (PTRACE_GETFPREGS, inferior_pid, 0, (int) &buf);
|
|
if (ret < 0)
|
|
{
|
|
warning ("Couldn't get floating point status");
|
|
return;
|
|
}
|
|
|
|
convert_to_fpregset (&buf, registers, register_valid);
|
|
|
|
ret = ptrace (PTRACE_SETFPREGS, inferior_pid, 0, (int) &buf);
|
|
if (ret < 0)
|
|
{
|
|
warning ("Couldn't write floating point status");
|
|
return;
|
|
}
|
|
}
|
|
|
|
|
|
/* Read the general registers from the process, and store them
|
|
in registers[]. */
|
|
static void
|
|
fetch_regs ()
|
|
{
|
|
int ret, regno;
|
|
gregset_t buf;
|
|
|
|
ret = ptrace (PTRACE_GETREGS, inferior_pid, 0, (int) &buf);
|
|
if (ret < 0)
|
|
{
|
|
warning ("Couldn't get registers");
|
|
return;
|
|
}
|
|
|
|
supply_gregset (&buf);
|
|
}
|
|
|
|
|
|
/* Set the inferior's general registers to the values in registers[]
|
|
--- but only those registers marked as valid. */
|
|
static void
|
|
store_regs ()
|
|
{
|
|
int ret, regno;
|
|
gregset_t buf;
|
|
|
|
ret = ptrace (PTRACE_GETREGS, inferior_pid, 0, (int) &buf);
|
|
if (ret < 0)
|
|
{
|
|
warning ("Couldn't get registers");
|
|
return;
|
|
}
|
|
|
|
convert_to_gregset (&buf, registers, register_valid);
|
|
|
|
ret = ptrace (PTRACE_SETREGS, inferior_pid, 0, (int)buf);
|
|
if (ret < 0)
|
|
{
|
|
warning ("Couldn't write registers");
|
|
return;
|
|
}
|
|
}
|
|
|
|
|
|
/* 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
|
|
fetch_inferior_registers (int regno)
|
|
{
|
|
if (regno < NUM_GREGS || regno == -1)
|
|
fetch_regs ();
|
|
|
|
if (regno >= NUM_GREGS || regno == -1)
|
|
fetch_fpregs ();
|
|
}
|
|
|
|
|
|
/* 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;
|
|
{
|
|
if (regno < NUM_GREGS || regno == -1)
|
|
store_regs ();
|
|
|
|
if (regno >= NUM_GREGS || regno == -1)
|
|
store_fpregs ();
|
|
}
|
|
|
|
|
|
/* 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;
|
|
}
|