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binutils-gdb/gdbserver/win32-i386-low.cc
Andrew Burgess 1048062a3f gdbserver: pass osabi to GDB in more target descriptions 
Problem Description
-------------------

On a Windows machine I built gdbserver, configured for the target
'x86_64-w64-mingw32', then on a GNU/Linux machine I built GDB with
support for all target (--enable-targets=all).

On the Windows machine I start gdbserver with a small test binary:

  $ gdbserver 192.168.129.25:54321 C:\some\directory\executable.exe

On the GNU/Linux machine I start GDB without the test binary, and
connect to gdbserver.

As I have not given GDB the test binary, my expectation is that GDB
would connect to gdbserver and then download the file over the remote
protocol, but instead I was presented with this message:

  (gdb) target remote 192.168.129.25:54321
  Remote debugging using 192.168.129.25:54321
  warning: C:\some\directory\executable.exe: No such file or directory.
  0x00007ffa3e1e1741 in ?? ()
  (gdb)

What I found is that if I told GDB where to find the binary, like
this:

  (gdb) file target:C:/some/directory/executable.exe
  A program is being debugged already.
  Are you sure you want to change the file? (y or n) y
  Reading C:/some/directory/executable.exe from remote target...
  warning: File transfers from remote targets can be slow. Use "set sysroot" to access files locally instead.
  Reading C:/some/directory/executable.exe from remote target...
  Reading symbols from target:C:/some/directory/executable.exe...
  (gdb)

then GDB would download the executable.

The Actual Issue
----------------

I tracked the problem down to exec_file_find (solib.c).  The remote
target was passing an absolute Windows filename (beginning with "C:/"
in this case), but in exec_file_find GDB was failing the
IS_TARGET_ABSOLUTE_PATH call, and so was treating the filename as
relative.

The IS_TARGET_ABSOLUTE_PATH call was failing because GDB thought that
the file system kind was "unix", and as the filename didn't start with
a "/" it assumed the filename was not absolute.

But I'm connecting to a Windows target and 'target-file-system-kind'
was set to "auto", so GDB should be figuring out that the target
file-system is "dos-based".

Looking in effective_target_file_system_kind (filesystem.c), we find
that the logic of "auto" is delegated to the current gdbarch.  However
in windows-tdep.c we see:

  set_gdbarch_has_dos_based_file_system (gdbarch, 1);

So if we are using a Windows gdbarch we should have "dos-based"
filesystems.  What this means is that after connecting to the remote
target GDB has selected the wrong gdbarch.

What's happening is that the target description sent back by the
remote target only includes the x86-64 registers.  There's no
information about which OS we're on.  As a consequence, GDB picks the
first x86-64 gdbarch which can handle the provided register set, which
happens to be a GNU/Linux gdbarch.

And indeed, there doesn't appear to be anywhere in gdbserver that sets
the osabi on the target descriptions. Some target descriptions do have
their osabi set when the description is created, e.g. in:

  gdb/arch/amd64.c	- Sets GNU/Linux osabi when appropriate.
  gdb/arch/i386.c	- Likewise.
  gdb/arch/tic6x.c	- Always set GNU/Linux osabi.

There are also some cases in gdb/features/*.c where the tdesc is set,
but these locations are only called from GDB, not from gdbserver.

This means that many target descriptions are created without an osabi,
gdbserver does nothing to fix this, and the description is returned to
GDB without an osabi included.  This leaves GDB having to guess what
the target osabi is, and in some cases, GDB can get this wrong.

Proposed Solution
-----------------

I propose to change init_target_desc so that it requires an gdb_osabi
to be passed in, this will then be used to set the target_desc osabi
field.

I believe that within gdbserver init_target_desc is called for every
target_desc, so this should mean that every target_desc has an
opportunity to set the osabi to something sane.

I did consider passing the osabi into the code which creates the
target_desc objects, but that would require updating far more code, as
each target has its own code for creating target descriptions.
The approach taken here requires minimal changes and forces every
user of init_target_desc to think about what the correct osabi is.

In some cases, e.g. amd64, where the osabi is already set when the
target_desc is created, the init_target_desc call will override the
current value, however, we should always be replacing it with the same
actual value.  i.e. if the target_desc is created with the osabi set
to GNU/Linux, then this should only happen when gdbserver is built for
GNU/Linux, in which case the init_target_desc should also be setting
the osabi to GNU/Linux.

The Tricky Bits
---------------

Some targets, like amd64, use a features based approach for creating
target_desc objects, there's a function in arch/amd64.c which creates
a target_desc, adds features too it, and returns the new target_desc.
This target_desc is then passed to an init_target_desc call within
gdbserver.  This is the easy case to handle.

Then there are other targets which instead have a fixed set of xml
files, each of which is converted into a .dat file, which is then used
to generate a .cc file, which is compiled into gdbserver.  The
generated .cc file creates the target_desc object and calls
init_target_desc on it.  In this case though the target description
that is sent to GDB isn't generated from the target_desc object, but
is instead the contents of the fixed xml file.  For this case the
osabi which we pass to init_target_desc should match the osabi that
exists in the fixed xml file.

Luckily, in the previous commit I copied the osabi information from
the fixed xml files into the .dat files.  So in this commit I have
extended regdat.sh to read the osabi from the .dat file and use it in
the generated init_target_desc call.

The problem with some of these .dat base targets is that their fixed
xml files don't currently contain any osabi information, and the file
names don't indicate that they are Linux only (despite them currently
only being used from gdbserver for Linux targets), so I don't
currently feel confident adding any osabi information to these files.
An example would be features/rs6000/powerpc-64.xml.  For now I've just
ignored these cases.  The init_target_desc will use GDB_OSABI_UNKNOWN
which is the default.  This means that for these targets nothing
changes from the current behaviour.  But many other targets do now
pass the osabi back.  Targets that do pass the osabi back are
improved with this commit.

Conclusion
----------

Now when I connect to the Windows remote the target description
returned includes the osabi name.  With this extra information GDB
selects the correct gdbarch object, which means that GDB understands
the target has a "dos-based" file-system.  With that correct GDB
understands that the filename it was given is absolute, and so fetches
the file from the remote as we'd like.

Reviewed-By: Kevin Buettner <kevinb@redhat.com>
2024-11-12 12:51:36 +00:00

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/* Copyright (C) 2007-2024 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "win32-low.h"
#include "x86-low.h"
#include "gdbsupport/x86-xstate.h"
#ifdef __x86_64__
#include "arch/amd64.h"
#endif
#include "arch/i386.h"
#include "tdesc.h"
#include "x86-tdesc.h"
using namespace windows_nat;
#ifndef CONTEXT_EXTENDED_REGISTERS
#define CONTEXT_EXTENDED_REGISTERS 0
#endif
#define I386_FISEG_REGNUM 27
#define I386_FOP_REGNUM 31
#define I386_CS_REGNUM 10
#define I386_GS_REGNUM 15
#define AMD64_FISEG_REGNUM 35
#define AMD64_FOP_REGNUM 39
#define AMD64_CS_REGNUM 18
#define AMD64_GS_REGNUM 23
#define FLAG_TRACE_BIT 0x100
static struct x86_debug_reg_state debug_reg_state;
static void
update_debug_registers (thread_info *thread)
{
windows_thread_info *th = (windows_thread_info *) thread_target_data (thread);
/* The actual update is done later just before resuming the lwp,
we just mark that the registers need updating. */
th->debug_registers_changed = true;
}
/* Update the inferior's debug register REGNUM from STATE. */
static void
x86_dr_low_set_addr (int regnum, CORE_ADDR addr)
{
gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR);
/* Only update the threads of this process. */
current_process ()->for_each_thread (update_debug_registers);
}
/* Update the inferior's DR7 debug control register from STATE. */
static void
x86_dr_low_set_control (unsigned long control)
{
/* Only update the threads of this process. */
current_process ()->for_each_thread (update_debug_registers);
}
/* Return the current value of a DR register of the current thread's
context. */
static DWORD64
win32_get_current_dr (int dr)
{
windows_thread_info *th
= (windows_thread_info *) thread_target_data (current_thread);
win32_require_context (th);
#ifdef __x86_64__
#define RET_DR(DR) \
case DR: \
return th->wow64_context.Dr ## DR
if (windows_process.wow64_process)
{
switch (dr)
{
RET_DR (0);
RET_DR (1);
RET_DR (2);
RET_DR (3);
RET_DR (6);
RET_DR (7);
}
}
else
#undef RET_DR
#endif
#define RET_DR(DR) \
case DR: \
return th->context.Dr ## DR
{
switch (dr)
{
RET_DR (0);
RET_DR (1);
RET_DR (2);
RET_DR (3);
RET_DR (6);
RET_DR (7);
}
}
#undef RET_DR
gdb_assert_not_reached ("unhandled dr");
}
static CORE_ADDR
x86_dr_low_get_addr (int regnum)
{
gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR);
return win32_get_current_dr (regnum - DR_FIRSTADDR);
}
static unsigned long
x86_dr_low_get_control (void)
{
return win32_get_current_dr (7);
}
/* Get the value of the DR6 debug status register from the inferior
and record it in STATE. */
static unsigned long
x86_dr_low_get_status (void)
{
return win32_get_current_dr (6);
}
/* Low-level function vector. */
struct x86_dr_low_type x86_dr_low =
{
x86_dr_low_set_control,
x86_dr_low_set_addr,
x86_dr_low_get_addr,
x86_dr_low_get_status,
x86_dr_low_get_control,
sizeof (void *),
};
/* Breakpoint/watchpoint support. */
static int
i386_supports_z_point_type (char z_type)
{
switch (z_type)
{
case Z_PACKET_HW_BP:
case Z_PACKET_WRITE_WP:
case Z_PACKET_ACCESS_WP:
return 1;
default:
return 0;
}
}
static int
i386_insert_point (enum raw_bkpt_type type, CORE_ADDR addr,
int size, struct raw_breakpoint *bp)
{
switch (type)
{
case raw_bkpt_type_hw:
case raw_bkpt_type_write_wp:
case raw_bkpt_type_access_wp:
{
enum target_hw_bp_type hw_type
= raw_bkpt_type_to_target_hw_bp_type (type);
return x86_dr_insert_watchpoint (&debug_reg_state,
hw_type, addr, size);
}
default:
/* Unsupported. */
return 1;
}
}
static int
i386_remove_point (enum raw_bkpt_type type, CORE_ADDR addr,
int size, struct raw_breakpoint *bp)
{
switch (type)
{
case raw_bkpt_type_hw:
case raw_bkpt_type_write_wp:
case raw_bkpt_type_access_wp:
{
enum target_hw_bp_type hw_type
= raw_bkpt_type_to_target_hw_bp_type (type);
return x86_dr_remove_watchpoint (&debug_reg_state,
hw_type, addr, size);
}
default:
/* Unsupported. */
return 1;
}
}
static int
x86_stopped_by_watchpoint (void)
{
return x86_dr_stopped_by_watchpoint (&debug_reg_state);
}
static CORE_ADDR
x86_stopped_data_address (void)
{
CORE_ADDR addr;
if (x86_dr_stopped_data_address (&debug_reg_state, &addr))
return addr;
return 0;
}
static void
i386_initial_stuff (void)
{
x86_low_init_dregs (&debug_reg_state);
}
static void
i386_get_thread_context (windows_thread_info *th)
{
/* Requesting the CONTEXT_EXTENDED_REGISTERS register set fails if
the system doesn't support extended registers. */
static DWORD extended_registers = CONTEXT_EXTENDED_REGISTERS;
again:
#ifdef __x86_64__
if (windows_process.wow64_process)
th->wow64_context.ContextFlags = (CONTEXT_FULL
| CONTEXT_FLOATING_POINT
| CONTEXT_DEBUG_REGISTERS
| extended_registers);
else
#endif
th->context.ContextFlags = (CONTEXT_FULL
| CONTEXT_FLOATING_POINT
| CONTEXT_DEBUG_REGISTERS
| extended_registers);
BOOL ret;
#ifdef __x86_64__
if (windows_process.wow64_process)
ret = Wow64GetThreadContext (th->h, &th->wow64_context);
else
#endif
ret = GetThreadContext (th->h, &th->context);
if (!ret)
{
DWORD e = GetLastError ();
if (extended_registers && e == ERROR_INVALID_PARAMETER)
{
extended_registers = 0;
goto again;
}
error ("GetThreadContext failure %ld\n", (long) e);
}
}
static void
i386_prepare_to_resume (windows_thread_info *th)
{
if (th->debug_registers_changed)
{
struct x86_debug_reg_state *dr = &debug_reg_state;
win32_require_context (th);
#ifdef __x86_64__
if (windows_process.wow64_process)
{
th->wow64_context.Dr0 = dr->dr_mirror[0];
th->wow64_context.Dr1 = dr->dr_mirror[1];
th->wow64_context.Dr2 = dr->dr_mirror[2];
th->wow64_context.Dr3 = dr->dr_mirror[3];
/* th->wow64_context.Dr6 = dr->dr_status_mirror;
FIXME: should we set dr6 also ?? */
th->wow64_context.Dr7 = dr->dr_control_mirror;
}
else
#endif
{
th->context.Dr0 = dr->dr_mirror[0];
th->context.Dr1 = dr->dr_mirror[1];
th->context.Dr2 = dr->dr_mirror[2];
th->context.Dr3 = dr->dr_mirror[3];
/* th->context.Dr6 = dr->dr_status_mirror;
FIXME: should we set dr6 also ?? */
th->context.Dr7 = dr->dr_control_mirror;
}
th->debug_registers_changed = false;
}
}
static void
i386_thread_added (windows_thread_info *th)
{
th->debug_registers_changed = true;
}
static void
i386_single_step (windows_thread_info *th)
{
#ifdef __x86_64__
if (windows_process.wow64_process)
th->wow64_context.EFlags |= FLAG_TRACE_BIT;
else
#endif
th->context.EFlags |= FLAG_TRACE_BIT;
}
/* An array of offset mappings into a Win32 Context structure.
This is a one-to-one mapping which is indexed by gdb's register
numbers. It retrieves an offset into the context structure where
the 4 byte register is located.
An offset value of -1 indicates that Win32 does not provide this
register in it's CONTEXT structure. In this case regptr will return
a pointer into a dummy register. */
#ifdef __x86_64__
#define context_offset(x) (offsetof (WOW64_CONTEXT, x))
#else
#define context_offset(x) ((int)&(((CONTEXT *)NULL)->x))
#endif
static const int i386_mappings[] = {
context_offset (Eax),
context_offset (Ecx),
context_offset (Edx),
context_offset (Ebx),
context_offset (Esp),
context_offset (Ebp),
context_offset (Esi),
context_offset (Edi),
context_offset (Eip),
context_offset (EFlags),
context_offset (SegCs),
context_offset (SegSs),
context_offset (SegDs),
context_offset (SegEs),
context_offset (SegFs),
context_offset (SegGs),
context_offset (FloatSave.RegisterArea[0 * 10]),
context_offset (FloatSave.RegisterArea[1 * 10]),
context_offset (FloatSave.RegisterArea[2 * 10]),
context_offset (FloatSave.RegisterArea[3 * 10]),
context_offset (FloatSave.RegisterArea[4 * 10]),
context_offset (FloatSave.RegisterArea[5 * 10]),
context_offset (FloatSave.RegisterArea[6 * 10]),
context_offset (FloatSave.RegisterArea[7 * 10]),
context_offset (FloatSave.ControlWord),
context_offset (FloatSave.StatusWord),
context_offset (FloatSave.TagWord),
context_offset (FloatSave.ErrorSelector),
context_offset (FloatSave.ErrorOffset),
context_offset (FloatSave.DataSelector),
context_offset (FloatSave.DataOffset),
context_offset (FloatSave.ErrorSelector),
/* XMM0-7 */
context_offset (ExtendedRegisters[10 * 16]),
context_offset (ExtendedRegisters[11 * 16]),
context_offset (ExtendedRegisters[12 * 16]),
context_offset (ExtendedRegisters[13 * 16]),
context_offset (ExtendedRegisters[14 * 16]),
context_offset (ExtendedRegisters[15 * 16]),
context_offset (ExtendedRegisters[16 * 16]),
context_offset (ExtendedRegisters[17 * 16]),
/* MXCSR */
context_offset (ExtendedRegisters[24])
};
#undef context_offset
#ifdef __x86_64__
#define context_offset(x) (offsetof (CONTEXT, x))
static const int amd64_mappings[] =
{
context_offset (Rax),
context_offset (Rbx),
context_offset (Rcx),
context_offset (Rdx),
context_offset (Rsi),
context_offset (Rdi),
context_offset (Rbp),
context_offset (Rsp),
context_offset (R8),
context_offset (R9),
context_offset (R10),
context_offset (R11),
context_offset (R12),
context_offset (R13),
context_offset (R14),
context_offset (R15),
context_offset (Rip),
context_offset (EFlags),
context_offset (SegCs),
context_offset (SegSs),
context_offset (SegDs),
context_offset (SegEs),
context_offset (SegFs),
context_offset (SegGs),
context_offset (FloatSave.FloatRegisters[0]),
context_offset (FloatSave.FloatRegisters[1]),
context_offset (FloatSave.FloatRegisters[2]),
context_offset (FloatSave.FloatRegisters[3]),
context_offset (FloatSave.FloatRegisters[4]),
context_offset (FloatSave.FloatRegisters[5]),
context_offset (FloatSave.FloatRegisters[6]),
context_offset (FloatSave.FloatRegisters[7]),
context_offset (FloatSave.ControlWord),
context_offset (FloatSave.StatusWord),
context_offset (FloatSave.TagWord),
context_offset (FloatSave.ErrorSelector),
context_offset (FloatSave.ErrorOffset),
context_offset (FloatSave.DataSelector),
context_offset (FloatSave.DataOffset),
context_offset (FloatSave.ErrorSelector)
/* XMM0-7 */ ,
context_offset (Xmm0),
context_offset (Xmm1),
context_offset (Xmm2),
context_offset (Xmm3),
context_offset (Xmm4),
context_offset (Xmm5),
context_offset (Xmm6),
context_offset (Xmm7),
context_offset (Xmm8),
context_offset (Xmm9),
context_offset (Xmm10),
context_offset (Xmm11),
context_offset (Xmm12),
context_offset (Xmm13),
context_offset (Xmm14),
context_offset (Xmm15),
/* MXCSR */
context_offset (FloatSave.MxCsr)
};
#undef context_offset
#endif /* __x86_64__ */
/* Return true if R is the FISEG register. */
static bool
is_fiseg_register (int r)
{
#ifdef __x86_64__
if (!windows_process.wow64_process)
return r == AMD64_FISEG_REGNUM;
else
#endif
return r == I386_FISEG_REGNUM;
}
/* Return true if R is the FOP register. */
static bool
is_fop_register (int r)
{
#ifdef __x86_64__
if (!windows_process.wow64_process)
return r == AMD64_FOP_REGNUM;
else
#endif
return r == I386_FOP_REGNUM;
}
/* Return true if R is a segment register. */
static bool
is_segment_register (int r)
{
#ifdef __x86_64__
if (!windows_process.wow64_process)
return r >= AMD64_CS_REGNUM && r <= AMD64_GS_REGNUM;
else
#endif
return r >= I386_CS_REGNUM && r <= I386_GS_REGNUM;
}
/* Fetch register from gdbserver regcache data. */
static void
i386_fetch_inferior_register (struct regcache *regcache,
windows_thread_info *th, int r)
{
const int *mappings;
#ifdef __x86_64__
if (!windows_process.wow64_process)
mappings = amd64_mappings;
else
#endif
mappings = i386_mappings;
char *context_offset;
#ifdef __x86_64__
if (windows_process.wow64_process)
context_offset = (char *) &th->wow64_context + mappings[r];
else
#endif
context_offset = (char *) &th->context + mappings[r];
/* GDB treats some registers as 32-bit, where they are in fact only
16 bits long. These cases must be handled specially to avoid
reading extraneous bits from the context. */
if (is_fiseg_register (r) || is_segment_register (r))
{
gdb_byte bytes[4] = {};
memcpy (bytes, context_offset, 2);
supply_register (regcache, r, bytes);
}
else if (is_fop_register (r))
{
long l = (*((long *) context_offset) >> 16) & ((1 << 11) - 1);
supply_register (regcache, r, (char *) &l);
}
else
supply_register (regcache, r, context_offset);
}
/* Store a new register value into the thread context of TH. */
static void
i386_store_inferior_register (struct regcache *regcache,
windows_thread_info *th, int r)
{
const int *mappings;
#ifdef __x86_64__
if (!windows_process.wow64_process)
mappings = amd64_mappings;
else
#endif
mappings = i386_mappings;
char *context_offset;
#ifdef __x86_64__
if (windows_process.wow64_process)
context_offset = (char *) &th->wow64_context + mappings[r];
else
#endif
context_offset = (char *) &th->context + mappings[r];
/* GDB treats some registers as 32-bit, where they are in fact only
16 bits long. These cases must be handled specially to avoid
overwriting other registers in the context. */
if (is_fiseg_register (r) || is_segment_register (r))
{
gdb_byte bytes[4];
collect_register (regcache, r, bytes);
memcpy (context_offset, bytes, 2);
}
else if (is_fop_register (r))
{
gdb_byte bytes[4];
collect_register (regcache, r, bytes);
/* The value of FOP occupies the top two bytes in the context,
so write the two low-order bytes from the cache into the
appropriate spot. */
memcpy (context_offset + 2, bytes, 2);
}
else
collect_register (regcache, r, context_offset);
}
static const unsigned char i386_win32_breakpoint = 0xcc;
#define i386_win32_breakpoint_len 1
static void
i386_arch_setup (void)
{
struct target_desc *tdesc;
#ifdef __x86_64__
tdesc = amd64_create_target_description (X86_XSTATE_SSE_MASK, false,
false, false);
init_target_desc (tdesc, amd64_expedite_regs, WINDOWS_OSABI);
win32_tdesc = tdesc;
#endif
tdesc = i386_create_target_description (X86_XSTATE_SSE_MASK, false, false);
init_target_desc (tdesc, i386_expedite_regs, WINDOWS_OSABI);
#ifdef __x86_64__
wow64_win32_tdesc = tdesc;
#else
win32_tdesc = tdesc;
#endif
}
/* Implement win32_target_ops "num_regs" method. */
static int
i386_win32_num_regs (void)
{
int num_regs;
#ifdef __x86_64__
if (!windows_process.wow64_process)
num_regs = sizeof (amd64_mappings) / sizeof (amd64_mappings[0]);
else
#endif
num_regs = sizeof (i386_mappings) / sizeof (i386_mappings[0]);
return num_regs;
}
/* Implement win32_target_ops "get_pc" method. */
static CORE_ADDR
i386_win32_get_pc (struct regcache *regcache)
{
bool use_64bit = register_size (regcache->tdesc, 0) == 8;
if (use_64bit)
{
uint64_t pc;
collect_register_by_name (regcache, "rip", &pc);
return (CORE_ADDR) pc;
}
else
{
uint32_t pc;
collect_register_by_name (regcache, "eip", &pc);
return (CORE_ADDR) pc;
}
}
/* Implement win32_target_ops "set_pc" method. */
static void
i386_win32_set_pc (struct regcache *regcache, CORE_ADDR pc)
{
bool use_64bit = register_size (regcache->tdesc, 0) == 8;
if (use_64bit)
{
uint64_t newpc = pc;
supply_register_by_name (regcache, "rip", &newpc);
}
else
{
uint32_t newpc = pc;
supply_register_by_name (regcache, "eip", &newpc);
}
}
struct win32_target_ops the_low_target = {
i386_arch_setup,
i386_win32_num_regs,
i386_initial_stuff,
i386_get_thread_context,
i386_prepare_to_resume,
i386_thread_added,
i386_fetch_inferior_register,
i386_store_inferior_register,
i386_single_step,
&i386_win32_breakpoint,
i386_win32_breakpoint_len,
1,
i386_win32_get_pc,
i386_win32_set_pc,
i386_supports_z_point_type,
i386_insert_point,
i386_remove_point,
x86_stopped_by_watchpoint,
x86_stopped_data_address
};
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