[PATCH v3] Implement debugging of WOW64 processes in gdbserver
Hannes Domani
ssbssa@yahoo.de
Thu Apr 30 14:13:49 GMT 2020
gdbserver/ChangeLog:
2020-04-30 Hannes Domani <ssbssa@yahoo.de>
* configure.srv <x86_64-*-mingw*, x86_64-*-cygwin*> (srv_tgtobj):
Add arch/i386.o.
* win32-arm-low.cc (arm_num_regs): New function.
(struct win32_target_ops): Use arm_num_regs.
* win32-i386-low.cc (win32_get_current_dr): Adapt for WOW64
processes.
(i386_get_thread_context): Likewise.
(i386_prepare_to_resume): Likewise.
(i386_thread_added): Likewise.
(i386_single_step): Likewise.
(i386_fetch_inferior_register): Likewise.
(i386_store_inferior_register): Likewise.
(i386_arch_setup): Likewise.
(i386_win32_num_regs): New function.
(struct win32_target_ops): Use i386_win32_num_regs.
* win32-low.cc (win32_get_thread_context): Adapt for WOW64
processes.
(win32_require_context): Likewise.
(child_add_thread): Likewise.
(do_initial_child_stuff): Likewise.
(continue_one_thread): Likewise.
(win32_process_target::resume): Likewise.
(load_psapi): Likewise.
(win32_add_all_dlls): Likewise.
(maybe_adjust_pc): Likewise.
(win32_process_target::qxfer_siginfo): Likewise.
(initialize_low): Likewise.
* win32-low.h (struct win32_target_ops): Change num_regs to
callback function.
---
v2:
- Stop with error() if any of the WOW64 functions is not available when
debugging WOW64 processes.
v3:
- Some more comments.
- Error if IsWow64Process fails.
- Removed win32_Wow64SuspendThread since it's not (yet) used.
---
gdbserver/configure.srv | 4 +-
gdbserver/win32-arm-low.cc | 10 +-
gdbserver/win32-i386-low.cc | 171 +++++++++++++++++++++-----
gdbserver/win32-low.cc | 239 ++++++++++++++++++++++++++++++++----
gdbserver/win32-low.h | 10 +-
5 files changed, 372 insertions(+), 62 deletions(-)
diff --git a/gdbserver/configure.srv b/gdbserver/configure.srv
index 7acf229fbe..9a027e44af 100644
--- a/gdbserver/configure.srv
+++ b/gdbserver/configure.srv
@@ -397,14 +397,14 @@ case "${gdbserver_host}" in
srv_tgtobj="x86-low.o nat/x86-dregs.o i387-fp.o"
srv_tgtobj="${srv_tgtobj} win32-low.o win32-i386-low.o"
srv_tgtobj="${srv_tgtobj} nat/windows-nat.o"
- srv_tgtobj="${srv_tgtobj} arch/amd64.o"
+ srv_tgtobj="${srv_tgtobj} arch/amd64.o arch/i386.o"
srv_mingw=yes
;;
x86_64-*-cygwin*) srv_regobj=""
srv_tgtobj="x86-low.o nat/x86-dregs.o i387-fp.o"
srv_tgtobj="${srv_tgtobj} win32-low.o win32-i386-low.o"
srv_tgtobj="${srv_tgtobj} nat/windows-nat.o"
- srv_tgtobj="${srv_tgtobj} arch/amd64.o"
+ srv_tgtobj="${srv_tgtobj} arch/amd64.o arch/i386.o"
;;
xtensa*-*-linux*) srv_regobj=reg-xtensa.o
diff --git a/gdbserver/win32-arm-low.cc b/gdbserver/win32-arm-low.cc
index 238ee4b05b..aacf2cdf8c 100644
--- a/gdbserver/win32-arm-low.cc
+++ b/gdbserver/win32-arm-low.cc
@@ -111,6 +111,14 @@ arm_arch_setup (void)
win32_tdesc = tdesc_arm;
}
+/* Implement win32_target_ops "num_regs" method. */
+
+static int
+arm_num_regs (void)
+{
+ return sizeof (mappings) / sizeof (mappings[0]),
+}
+
/* Correct in either endianness. We do not support Thumb yet. */
static const unsigned long arm_wince_breakpoint = 0xe6000010;
#define arm_wince_breakpoint_len 4
@@ -138,7 +146,7 @@ arm_win32_set_pc (struct regcache *regcache, CORE_ADDR pc)
struct win32_target_ops the_low_target = {
arm_arch_setup,
- sizeof (mappings) / sizeof (mappings[0]),
+ arm_num_regs,
NULL, /* initial_stuff */
arm_get_thread_context,
NULL, /* prepare_to_resume */
diff --git a/gdbserver/win32-i386-low.cc b/gdbserver/win32-i386-low.cc
index 48893af33b..389ec49284 100644
--- a/gdbserver/win32-i386-low.cc
+++ b/gdbserver/win32-i386-low.cc
@@ -80,18 +80,40 @@ win32_get_current_dr (int dr)
win32_require_context (th);
+#ifdef __x86_64__
+#define RET_DR(DR) \
+ case DR: \
+ return th->wow64_context.Dr ## DR
+
+ if (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);
+ switch (dr)
+ {
+ RET_DR (0);
+ RET_DR (1);
+ RET_DR (2);
+ RET_DR (3);
+ RET_DR (6);
+ RET_DR (7);
+ }
}
#undef RET_DR
@@ -219,12 +241,27 @@ i386_get_thread_context (windows_thread_info *th)
static DWORD extended_registers = CONTEXT_EXTENDED_REGISTERS;
again:
- th->context.ContextFlags = (CONTEXT_FULL
- | CONTEXT_FLOATING_POINT
- | CONTEXT_DEBUG_REGISTERS
- | extended_registers);
+#ifdef __x86_64__
+ if (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);
- if (!GetThreadContext (th->h, &th->context))
+ BOOL ret;
+#ifdef __x86_64__
+ if (wow64_process)
+ ret = win32_Wow64GetThreadContext (th->h, &th->wow64_context);
+ else
+#endif
+ ret = GetThreadContext (th->h, &th->context);
+ if (!ret)
{
DWORD e = GetLastError ();
@@ -247,13 +284,28 @@ i386_prepare_to_resume (windows_thread_info *th)
win32_require_context (th);
- 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;
+#ifdef __x86_64__
+ if (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;
}
@@ -268,11 +320,14 @@ i386_thread_added (windows_thread_info *th)
static void
i386_single_step (windows_thread_info *th)
{
- th->context.EFlags |= FLAG_TRACE_BIT;
+#ifdef __x86_64__
+ if (wow64_process)
+ th->wow64_context.EFlags |= FLAG_TRACE_BIT;
+ else
+#endif
+ th->context.EFlags |= FLAG_TRACE_BIT;
}
-#ifndef __x86_64__
-
/* 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
@@ -280,8 +335,12 @@ i386_single_step (windows_thread_info *th)
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))
-static const int mappings[] = {
+#endif
+static const int i386_mappings[] = {
context_offset (Eax),
context_offset (Ecx),
context_offset (Edx),
@@ -328,10 +387,10 @@ static const int mappings[] = {
};
#undef context_offset
-#else /* __x86_64__ */
+#ifdef __x86_64__
#define context_offset(x) (offsetof (CONTEXT, x))
-static const int mappings[] =
+static const int amd64_mappings[] =
{
context_offset (Rax),
context_offset (Rbx),
@@ -402,7 +461,21 @@ static void
i386_fetch_inferior_register (struct regcache *regcache,
windows_thread_info *th, int r)
{
- char *context_offset = (char *) &th->context + mappings[r];
+ const int *mappings;
+#ifdef __x86_64__
+ if (!wow64_process)
+ mappings = amd64_mappings;
+ else
+#endif
+ mappings = i386_mappings;
+
+ char *context_offset;
+#ifdef __x86_64__
+ if (wow64_process)
+ context_offset = (char *) &th->wow64_context + mappings[r];
+ else
+#endif
+ context_offset = (char *) &th->context + mappings[r];
long l;
if (r == FCS_REGNUM)
@@ -424,7 +497,22 @@ static void
i386_store_inferior_register (struct regcache *regcache,
windows_thread_info *th, int r)
{
- char *context_offset = (char *) &th->context + mappings[r];
+ const int *mappings;
+#ifdef __x86_64__
+ if (!wow64_process)
+ mappings = amd64_mappings;
+ else
+#endif
+ mappings = i386_mappings;
+
+ char *context_offset;
+#ifdef __x86_64__
+ if (wow64_process)
+ context_offset = (char *) &th->wow64_context + mappings[r];
+ else
+#endif
+ context_offset = (char *) &th->context + mappings[r];
+
collect_register (regcache, r, context_offset);
}
@@ -439,15 +527,32 @@ i386_arch_setup (void)
#ifdef __x86_64__
tdesc = amd64_create_target_description (X86_XSTATE_SSE_MASK, false,
false, false);
- const char **expedite_regs = amd64_expedite_regs;
-#else
+ init_target_desc (tdesc, amd64_expedite_regs);
+ win32_tdesc = tdesc;
+#endif
+
tdesc = i386_create_target_description (X86_XSTATE_SSE_MASK, false, false);
- const char **expedite_regs = i386_expedite_regs;
+ init_target_desc (tdesc, i386_expedite_regs);
+#ifdef __x86_64__
+ wow64_win32_tdesc = tdesc;
+#else
+ win32_tdesc = tdesc;
#endif
+}
- init_target_desc (tdesc, expedite_regs);
+/* Implement win32_target_ops "num_regs" method. */
- win32_tdesc = tdesc;
+static int
+i386_win32_num_regs (void)
+{
+ int num_regs;
+#ifdef __x86_64__
+ if (!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. */
@@ -496,7 +601,7 @@ i386_win32_set_pc (struct regcache *regcache, CORE_ADDR pc)
struct win32_target_ops the_low_target = {
i386_arch_setup,
- sizeof (mappings) / sizeof (mappings[0]),
+ i386_win32_num_regs,
i386_initial_stuff,
i386_get_thread_context,
i386_prepare_to_resume,
diff --git a/gdbserver/win32-low.cc b/gdbserver/win32-low.cc
index 5a6f0df39f..4eb63b7ca2 100644
--- a/gdbserver/win32-low.cc
+++ b/gdbserver/win32-low.cc
@@ -88,15 +88,30 @@ static int soft_interrupt_requested = 0;
by suspending all the threads. */
static int faked_breakpoint = 0;
+#ifdef __x86_64__
+bool wow64_process = false;
+#endif
+
const struct target_desc *win32_tdesc;
+#ifdef __x86_64__
+const struct target_desc *wow64_win32_tdesc;
+#endif
-#define NUM_REGS (the_low_target.num_regs)
+#define NUM_REGS (the_low_target.num_regs ())
typedef BOOL (WINAPI *winapi_DebugActiveProcessStop) (DWORD dwProcessId);
typedef BOOL (WINAPI *winapi_DebugSetProcessKillOnExit) (BOOL KillOnExit);
typedef BOOL (WINAPI *winapi_DebugBreakProcess) (HANDLE);
typedef BOOL (WINAPI *winapi_GenerateConsoleCtrlEvent) (DWORD, DWORD);
+#ifdef __x86_64__
+typedef BOOL (WINAPI *winapi_Wow64SetThreadContext) (HANDLE,
+ const WOW64_CONTEXT *);
+
+winapi_Wow64GetThreadContext win32_Wow64GetThreadContext;
+static winapi_Wow64SetThreadContext win32_Wow64SetThreadContext;
+#endif
+
#ifndef _WIN32_WCE
static void win32_add_all_dlls (void);
#endif
@@ -121,7 +136,12 @@ debug_event_ptid (DEBUG_EVENT *event)
static void
win32_get_thread_context (windows_thread_info *th)
{
- memset (&th->context, 0, sizeof (CONTEXT));
+#ifdef __x86_64__
+ if (wow64_process)
+ memset (&th->wow64_context, 0, sizeof (WOW64_CONTEXT));
+ else
+#endif
+ memset (&th->context, 0, sizeof (CONTEXT));
(*the_low_target.get_thread_context) (th);
#ifdef _WIN32_WCE
memcpy (&th->base_context, &th->context, sizeof (CONTEXT));
@@ -146,7 +166,14 @@ win32_set_thread_context (windows_thread_info *th)
it between stopping and resuming. */
if (memcmp (&th->context, &th->base_context, sizeof (CONTEXT)) != 0)
#endif
- SetThreadContext (th->h, &th->context);
+ {
+#ifdef __x86_64__
+ if (wow64_process)
+ win32_Wow64SetThreadContext (th->h, &th->wow64_context);
+ else
+#endif
+ SetThreadContext (th->h, &th->context);
+ }
}
/* Set the thread context of the thread associated with TH. */
@@ -163,7 +190,14 @@ win32_prepare_to_resume (windows_thread_info *th)
void
win32_require_context (windows_thread_info *th)
{
- if (th->context.ContextFlags == 0)
+ DWORD context_flags;
+#ifdef __x86_64__
+ if (wow64_process)
+ context_flags = th->wow64_context.ContextFlags;
+ else
+#endif
+ context_flags = th->context.ContextFlags;
+ if (context_flags == 0)
{
th->suspend ();
win32_get_thread_context (th);
@@ -195,7 +229,14 @@ child_add_thread (DWORD pid, DWORD tid, HANDLE h, void *tlb)
if ((th = thread_rec (ptid, DONT_INVALIDATE_CONTEXT)))
return th;
- th = new windows_thread_info (tid, h, (CORE_ADDR) (uintptr_t) tlb);
+ CORE_ADDR base = (CORE_ADDR) (uintptr_t) tlb;
+#ifdef __x86_64__
+ /* For WOW64 processes, this is actually the pointer to the 64bit TIB,
+ and the 32bit TIB is exactly 2 pages after it. */
+ if (wow64_process)
+ base += 2 * 4096; /* page size = 4096 */
+#endif
+ th = new windows_thread_info (tid, h, base);
add_thread (ptid, th);
@@ -345,8 +386,31 @@ do_initial_child_stuff (HANDLE proch, DWORD pid, int attached)
memset (¤t_event, 0, sizeof (current_event));
+#ifdef __x86_64__
+ BOOL wow64;
+ if (!IsWow64Process (proch, &wow64))
+ {
+ DWORD err = GetLastError ();
+ error ("Check if WOW64 process failed (error %d): %s\n",
+ (int) err, strwinerror (err));
+ }
+ wow64_process = wow64;
+
+ if (wow64_process
+ && (win32_Wow64GetThreadContext == nullptr
+ || win32_Wow64SetThreadContext == nullptr))
+ error ("WOW64 debugging is not supported on this system.\n");
+
+ ignore_first_breakpoint = !attached && wow64_process;
+#endif
+
proc = add_process (pid, attached);
- proc->tdesc = win32_tdesc;
+#ifdef __x86_64__
+ if (wow64_process)
+ proc->tdesc = wow64_win32_tdesc;
+ else
+#endif
+ proc->tdesc = win32_tdesc;
child_init_thread_list ();
child_initialization_done = 0;
@@ -416,10 +480,17 @@ continue_one_thread (thread_info *thread, int thread_id)
if (th->suspended)
{
- if (th->context.ContextFlags)
+ DWORD *context_flags;
+#ifdef __x86_64__
+ if (wow64_process)
+ context_flags = &th->wow64_context.ContextFlags;
+ else
+#endif
+ context_flags = &th->context.ContextFlags;
+ if (*context_flags)
{
win32_set_thread_context (th);
- th->context.ContextFlags = 0;
+ *context_flags = 0;
}
th->resume ();
@@ -943,7 +1014,14 @@ win32_process_target::resume (thread_resume *resume_info, size_t n)
{
win32_prepare_to_resume (th);
- if (th->context.ContextFlags)
+ DWORD *context_flags;
+#ifdef __x86_64__
+ if (wow64_process)
+ context_flags = &th->wow64_context.ContextFlags;
+ else
+#endif
+ context_flags = &th->context.ContextFlags;
+ if (*context_flags)
{
/* Move register values from the inferior into the thread
context structure. */
@@ -959,7 +1037,7 @@ win32_process_target::resume (thread_resume *resume_info, size_t n)
}
win32_set_thread_context (th);
- th->context.ContextFlags = 0;
+ *context_flags = 0;
}
}
@@ -1032,12 +1110,19 @@ win32_add_one_solib (const char *name, CORE_ADDR load_addr)
typedef BOOL (WINAPI *winapi_EnumProcessModules) (HANDLE, HMODULE *,
DWORD, LPDWORD);
+#ifdef __x86_64__
+typedef BOOL (WINAPI *winapi_EnumProcessModulesEx) (HANDLE, HMODULE *, DWORD,
+ LPDWORD, DWORD);
+#endif
typedef BOOL (WINAPI *winapi_GetModuleInformation) (HANDLE, HMODULE,
LPMODULEINFO, DWORD);
typedef DWORD (WINAPI *winapi_GetModuleFileNameExA) (HANDLE, HMODULE,
LPSTR, DWORD);
static winapi_EnumProcessModules win32_EnumProcessModules;
+#ifdef __x86_64__
+static winapi_EnumProcessModulesEx win32_EnumProcessModulesEx;
+#endif
static winapi_GetModuleInformation win32_GetModuleInformation;
static winapi_GetModuleFileNameExA win32_GetModuleFileNameExA;
@@ -1055,12 +1140,21 @@ load_psapi (void)
return FALSE;
win32_EnumProcessModules =
GETPROCADDRESS (dll, EnumProcessModules);
+#ifdef __x86_64__
+ win32_EnumProcessModulesEx =
+ GETPROCADDRESS (dll, EnumProcessModulesEx);
+#endif
win32_GetModuleInformation =
GETPROCADDRESS (dll, GetModuleInformation);
win32_GetModuleFileNameExA =
GETPROCADDRESS (dll, GetModuleFileNameExA);
}
+#ifdef __x86_64__
+ if (wow64_process && win32_EnumProcessModulesEx == nullptr)
+ return FALSE;
+#endif
+
return (win32_EnumProcessModules != NULL
&& win32_GetModuleInformation != NULL
&& win32_GetModuleFileNameExA != NULL);
@@ -1084,10 +1178,19 @@ win32_add_all_dlls (void)
return;
cbNeeded = 0;
- ok = (*win32_EnumProcessModules) (current_process_handle,
- DllHandle,
- sizeof (HMODULE),
- &cbNeeded);
+#ifdef __x86_64__
+ if (wow64_process)
+ ok = (*win32_EnumProcessModulesEx) (current_process_handle,
+ DllHandle,
+ sizeof (HMODULE),
+ &cbNeeded,
+ LIST_MODULES_32BIT);
+ else
+#endif
+ ok = (*win32_EnumProcessModules) (current_process_handle,
+ DllHandle,
+ sizeof (HMODULE),
+ &cbNeeded);
if (!ok || !cbNeeded)
return;
@@ -1096,13 +1199,53 @@ win32_add_all_dlls (void)
if (!DllHandle)
return;
- ok = (*win32_EnumProcessModules) (current_process_handle,
- DllHandle,
- cbNeeded,
- &cbNeeded);
+#ifdef __x86_64__
+ if (wow64_process)
+ ok = (*win32_EnumProcessModulesEx) (current_process_handle,
+ DllHandle,
+ cbNeeded,
+ &cbNeeded,
+ LIST_MODULES_32BIT);
+ else
+#endif
+ ok = (*win32_EnumProcessModules) (current_process_handle,
+ DllHandle,
+ cbNeeded,
+ &cbNeeded);
if (!ok)
return;
+ char system_dir[MAX_PATH];
+ char syswow_dir[MAX_PATH];
+ size_t system_dir_len = 0;
+ bool convert_syswow_dir = false;
+#ifdef __x86_64__
+ if (wow64_process)
+#endif
+ {
+ /* This fails on 32bit Windows because it has no SysWOW64 directory,
+ and in this case a path conversion isn't necessary. */
+ UINT len = GetSystemWow64DirectoryA (syswow_dir, sizeof (syswow_dir));
+ if (len > 0)
+ {
+ /* Check that we have passed a large enough buffer. */
+ gdb_assert (len < sizeof (syswow_dir));
+
+ len = GetSystemDirectoryA (system_dir, sizeof (system_dir));
+ /* Error check. */
+ gdb_assert (len != 0);
+ /* Check that we have passed a large enough buffer. */
+ gdb_assert (len < sizeof (system_dir));
+
+ strcat (system_dir, "\\");
+ strcat (syswow_dir, "\\");
+ system_dir_len = strlen (system_dir);
+
+ convert_syswow_dir = true;
+ }
+
+ }
+
for (i = 1; i < ((size_t) cbNeeded / sizeof (HMODULE)); i++)
{
MODULEINFO mi;
@@ -1118,7 +1261,22 @@ win32_add_all_dlls (void)
dll_name,
MAX_PATH) == 0)
continue;
- win32_add_one_solib (dll_name, (CORE_ADDR) (uintptr_t) mi.lpBaseOfDll);
+
+ const char *name = dll_name;
+ /* Convert the DLL path of 32bit processes returned by
+ GetModuleFileNameEx from the 64bit system directory to the
+ 32bit syswow64 directory if necessary. */
+ std::string syswow_dll_path;
+ if (convert_syswow_dir
+ && strncasecmp (dll_name, system_dir, system_dir_len) == 0
+ && strchr (dll_name + system_dir_len, '\\') == nullptr)
+ {
+ syswow_dll_path = syswow_dir;
+ syswow_dll_path += dll_name + system_dir_len;
+ name = syswow_dll_path.c_str();
+ }
+
+ win32_add_one_solib (name, (CORE_ADDR) (uintptr_t) mi.lpBaseOfDll);
}
}
#endif
@@ -1221,8 +1379,10 @@ maybe_adjust_pc ()
th->stopped_at_software_breakpoint = false;
if (current_event.dwDebugEventCode == EXCEPTION_DEBUG_EVENT
- && (current_event.u.Exception.ExceptionRecord.ExceptionCode
- == EXCEPTION_BREAKPOINT)
+ && ((current_event.u.Exception.ExceptionRecord.ExceptionCode
+ == EXCEPTION_BREAKPOINT)
+ || (current_event.u.Exception.ExceptionRecord.ExceptionCode
+ == STATUS_WX86_BREAKPOINT))
&& child_initialization_done)
{
th->stopped_at_software_breakpoint = true;
@@ -1684,13 +1844,34 @@ win32_process_target::qxfer_siginfo (const char *annex,
if (readbuf == nullptr)
return -1;
- if (offset > sizeof (siginfo_er))
+ char *buf = (char *) &siginfo_er;
+ size_t bufsize = sizeof (siginfo_er);
+
+#ifdef __x86_64__
+ EXCEPTION_RECORD32 er32;
+ if (wow64_process)
+ {
+ buf = (char *) &er32;
+ bufsize = sizeof (er32);
+
+ er32.ExceptionCode = siginfo_er.ExceptionCode;
+ er32.ExceptionFlags = siginfo_er.ExceptionFlags;
+ er32.ExceptionRecord = (uintptr_t) siginfo_er.ExceptionRecord;
+ er32.ExceptionAddress = (uintptr_t) siginfo_er.ExceptionAddress;
+ er32.NumberParameters = siginfo_er.NumberParameters;
+ int i;
+ for (i = 0; i < EXCEPTION_MAXIMUM_PARAMETERS; i++)
+ er32.ExceptionInformation[i] = siginfo_er.ExceptionInformation[i];
+ }
+#endif
+
+ if (offset > bufsize)
return -1;
- if (offset + len > sizeof (siginfo_er))
- len = sizeof (siginfo_er) - offset;
+ if (offset + len > bufsize)
+ len = bufsize - offset;
- memcpy (readbuf, (char *) &siginfo_er + offset, len);
+ memcpy (readbuf, buf + offset, len);
return len;
}
@@ -1760,4 +1941,12 @@ initialize_low (void)
{
set_target_ops (&the_win32_target);
the_low_target.arch_setup ();
+
+#ifdef __x86_64__
+ /* These functions are loaded dynamically, because they are not available
+ on Windows XP. */
+ HMODULE dll = GetModuleHandle (_T("KERNEL32.DLL"));
+ win32_Wow64GetThreadContext = GETPROCADDRESS (dll, Wow64GetThreadContext);
+ win32_Wow64SetThreadContext = GETPROCADDRESS (dll, Wow64SetThreadContext);
+#endif
}
diff --git a/gdbserver/win32-low.h b/gdbserver/win32-low.h
index b3fa392dd3..a023eb1f83 100644
--- a/gdbserver/win32-low.h
+++ b/gdbserver/win32-low.h
@@ -27,6 +27,14 @@ struct target_desc;
/* The inferior's target description. This is a global because the
Windows ports support neither bi-arch nor multi-process. */
extern const struct target_desc *win32_tdesc;
+#ifdef __x86_64__
+extern const struct target_desc *wow64_win32_tdesc;
+
+extern bool wow64_process;
+
+typedef BOOL (WINAPI *winapi_Wow64GetThreadContext) (HANDLE, PWOW64_CONTEXT);
+extern winapi_Wow64GetThreadContext win32_Wow64GetThreadContext;
+#endif
struct win32_target_ops
{
@@ -34,7 +42,7 @@ struct win32_target_ops
void (*arch_setup) (void);
/* The number of target registers. */
- int num_regs;
+ int (*num_regs) (void);
/* Perform initializations on startup. */
void (*initial_stuff) (void);
--
2.26.2
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