* [PATCH v2] Implement debugging of WOW64 processes
[not found] <20200304171216.28885-1-ssbssa.ref@yahoo.de>
@ 2020-03-04 17:12 ` Hannes Domani via gdb-patches
2020-03-04 17:33 ` Eli Zaretskii
2020-03-04 18:15 ` Simon Marchi
0 siblings, 2 replies; 3+ messages in thread
From: Hannes Domani via gdb-patches @ 2020-03-04 17:12 UTC (permalink / raw)
To: gdb-patches
For WOW64 processes, the Wow64* variants of SuspendThread,
GetThreadContext, SetThreadContext, and GetThreadSelectorEntry have to
be used instead.
And instead of EnumProcessModules, EnumProcessModulesEx with
LIST_MODULES_32BIT is necessary.
gdb/ChangeLog:
2020-03-04 Hannes Domani <ssbssa@yahoo.de>
* NEWS: Mention support for WOW64 processes.
* amd64-windows-nat.c (amd64_mappings): Rename and remove static.
(amd64_windows_segment_register_p): Remove static.
(_initialize_amd64_windows_nat): Update.
* configure.nat <windows> (NATDEPFILES): Add i386-windows-nat.o.
* i386-windows-nat.c (context_offset): Update.
(i386_mappings): Rename and remove static.
(i386_windows_segment_register_p): Remove static.
(_initialize_i386_windows_nat): Update.
* windows-nat.c (STATUS_WX86_BREAKPOINT): New macro.
(STATUS_WX86_SINGLE_STEP): New macro.
(EnumProcessModulesEx): New macro.
(Wow64SuspendThread): New macro.
(Wow64GetThreadContext): New macro.
(Wow64SetThreadContext): New macro.
(Wow64GetThreadSelectorEntry): New macro.
(windows_add_thread): Adapt for WOW64 processes.
(windows_fetch_one_register): Likewise.
(windows_nat_target::fetch_registers): Likewise.
(windows_store_one_register): Likewise.
(display_selector): Likewise.
(display_selectors): Likewise.
(handle_exception): Likewise.
(windows_continue): Likewise.
(windows_nat_target::resume): Likewise.
(windows_add_all_dlls): Likewise.
(do_initial_windows_stuff): Likewise.
(windows_nat_target::attach): Likewise.
(windows_get_exec_module_filename): Likewise.
(windows_nat_target::create_inferior): Likewise.
(windows_xfer_siginfo): Likewise.
(_initialize_loadable): Initialize Wow64SuspendThread,
Wow64GetThreadContext, Wow64SetThreadContext,
Wow64GetThreadSelectorEntry and EnumProcessModulesEx.
* windows-nat.h (i386_windows_segment_register_p): Add declaration.
(amd64_windows_segment_register_p): Likewise.
---
v2:
- NEWS entry.
- Add i386-windows-nat.c to NATDEPFILES instead of including from amd64-windows-nat.c.
---
gdb/NEWS | 3 +
gdb/amd64-windows-nat.c | 6 +-
gdb/configure.nat | 4 +-
gdb/i386-windows-nat.c | 14 +-
gdb/windows-nat.c | 467 +++++++++++++++++++++++++++++++++-------
gdb/windows-nat.h | 14 ++
6 files changed, 418 insertions(+), 90 deletions(-)
diff --git a/gdb/NEWS b/gdb/NEWS
index cbdfcadb41..4dc6b33b65 100644
--- a/gdb/NEWS
+++ b/gdb/NEWS
@@ -39,6 +39,9 @@
string is that GDB will not try to load any previous command
history.
+* On Windows targets, it is now possible to debug 32-bit programs with a
+ 64-bit GDB.
+
* New commands
set exec-file-mismatch -- Set exec-file-mismatch handling (ask|warn|off).
diff --git a/gdb/amd64-windows-nat.c b/gdb/amd64-windows-nat.c
index 5b2c261aba..733ca0ce5f 100644
--- a/gdb/amd64-windows-nat.c
+++ b/gdb/amd64-windows-nat.c
@@ -23,7 +23,7 @@
#include <windows.h>
#define context_offset(x) (offsetof (CONTEXT, x))
-static const int mappings[] =
+const int amd64_mappings[] =
{
context_offset (Rax),
context_offset (Rbx),
@@ -89,7 +89,7 @@ static const int mappings[] =
/* segment_register_p_ftype implementation for amd64. */
-static int
+int
amd64_windows_segment_register_p (int regnum)
{
return regnum >= AMD64_CS_REGNUM && regnum <= AMD64_GS_REGNUM;
@@ -99,7 +99,7 @@ void _initialize_amd64_windows_nat ();
void
_initialize_amd64_windows_nat ()
{
- windows_set_context_register_offsets (mappings);
+ windows_set_context_register_offsets (amd64_mappings);
windows_set_segment_register_p (amd64_windows_segment_register_p);
x86_set_debug_register_length (8);
}
diff --git a/gdb/configure.nat b/gdb/configure.nat
index 3fc6f5cb4a..83ffdb8048 100644
--- a/gdb/configure.nat
+++ b/gdb/configure.nat
@@ -137,7 +137,7 @@ case ${gdb_host} in
i386)
# Native config information for GDB on amd64
# systems running Cygwin.
- NATDEPFILES="${NATDEPFILES} amd64-windows-nat.o"
+ NATDEPFILES="${NATDEPFILES} i386-windows-nat.o amd64-windows-nat.o"
;;
esac
;;
@@ -325,7 +325,7 @@ case ${gdb_host} in
mingw64)
case ${gdb_host_cpu} in
i386)
- NATDEPFILES="${NATDEPFILES} amd64-windows-nat.o"
+ NATDEPFILES="${NATDEPFILES} i386-windows-nat.o amd64-windows-nat.o"
;;
esac
;;
diff --git a/gdb/i386-windows-nat.c b/gdb/i386-windows-nat.c
index 958c83eafe..d5d707c75b 100644
--- a/gdb/i386-windows-nat.c
+++ b/gdb/i386-windows-nat.c
@@ -22,8 +22,11 @@
#include <windows.h>
-#define context_offset(x) ((int)&(((CONTEXT *)NULL)->x))
-static const int mappings[] =
+#ifdef __x86_64__
+#define CONTEXT WOW64_CONTEXT
+#endif
+#define context_offset(x) ((int)(size_t)&(((CONTEXT *)NULL)->x))
+const int i386_mappings[] =
{
context_offset (Eax),
context_offset (Ecx),
@@ -70,10 +73,11 @@ static const int mappings[] =
context_offset (ExtendedRegisters[24])
};
#undef context_offset
+#undef CONTEXT
/* segment_register_p_ftype implementation for x86. */
-static int
+int
i386_windows_segment_register_p (int regnum)
{
return regnum >= I386_CS_REGNUM && regnum <= I386_GS_REGNUM;
@@ -83,7 +87,9 @@ void _initialize_i386_windows_nat ();
void
_initialize_i386_windows_nat ()
{
- windows_set_context_register_offsets (mappings);
+#ifndef __x86_64__
+ windows_set_context_register_offsets (i386_mappings);
windows_set_segment_register_p (i386_windows_segment_register_p);
x86_set_debug_register_length (4);
+#endif
}
diff --git a/gdb/windows-nat.c b/gdb/windows-nat.c
index 76fcdd6bd4..1be5f03e8d 100644
--- a/gdb/windows-nat.c
+++ b/gdb/windows-nat.c
@@ -70,16 +70,24 @@
#include "gdbsupport/pathstuff.h"
#include "gdbsupport/gdb_wait.h"
+#define STATUS_WX86_BREAKPOINT 0x4000001F
+#define STATUS_WX86_SINGLE_STEP 0x4000001E
+
#define AdjustTokenPrivileges dyn_AdjustTokenPrivileges
#define DebugActiveProcessStop dyn_DebugActiveProcessStop
#define DebugBreakProcess dyn_DebugBreakProcess
#define DebugSetProcessKillOnExit dyn_DebugSetProcessKillOnExit
#define EnumProcessModules dyn_EnumProcessModules
+#define EnumProcessModulesEx dyn_EnumProcessModulesEx
#define GetModuleInformation dyn_GetModuleInformation
#define LookupPrivilegeValueA dyn_LookupPrivilegeValueA
#define OpenProcessToken dyn_OpenProcessToken
#define GetConsoleFontSize dyn_GetConsoleFontSize
#define GetCurrentConsoleFont dyn_GetCurrentConsoleFont
+#define Wow64SuspendThread dyn_Wow64SuspendThread
+#define Wow64GetThreadContext dyn_Wow64GetThreadContext
+#define Wow64SetThreadContext dyn_Wow64SetThreadContext
+#define Wow64GetThreadSelectorEntry dyn_Wow64GetThreadSelectorEntry
typedef BOOL WINAPI (AdjustTokenPrivileges_ftype) (HANDLE, BOOL,
PTOKEN_PRIVILEGES,
@@ -100,6 +108,12 @@ typedef BOOL WINAPI (EnumProcessModules_ftype) (HANDLE, HMODULE *, DWORD,
LPDWORD);
static EnumProcessModules_ftype *EnumProcessModules;
+#ifdef __x86_64__
+typedef BOOL WINAPI (EnumProcessModulesEx_ftype) (HANDLE, HMODULE *, DWORD,
+ LPDWORD, DWORD);
+static EnumProcessModulesEx_ftype *EnumProcessModulesEx;
+#endif
+
typedef BOOL WINAPI (GetModuleInformation_ftype) (HANDLE, HMODULE,
LPMODULEINFO, DWORD);
static GetModuleInformation_ftype *GetModuleInformation;
@@ -117,6 +131,22 @@ static GetCurrentConsoleFont_ftype *GetCurrentConsoleFont;
typedef COORD WINAPI (GetConsoleFontSize_ftype) (HANDLE, DWORD);
static GetConsoleFontSize_ftype *GetConsoleFontSize;
+#ifdef __x86_64__
+typedef DWORD WINAPI (Wow64SuspendThread_ftype) (HANDLE);
+static Wow64SuspendThread_ftype *Wow64SuspendThread;
+
+typedef BOOL WINAPI (Wow64GetThreadContext_ftype) (HANDLE, PWOW64_CONTEXT);
+static Wow64GetThreadContext_ftype *Wow64GetThreadContext;
+
+typedef BOOL WINAPI (Wow64SetThreadContext_ftype) (HANDLE,
+ const WOW64_CONTEXT *);
+static Wow64SetThreadContext_ftype *Wow64SetThreadContext;
+
+typedef BOOL WINAPI (Wow64GetThreadSelectorEntry_ftype) (HANDLE, DWORD,
+ PLDT_ENTRY);
+static Wow64GetThreadSelectorEntry_ftype *Wow64GetThreadSelectorEntry;
+#endif
+
#undef STARTUPINFO
#undef CreateProcess
#undef GetModuleFileNameEx
@@ -224,7 +254,13 @@ typedef struct windows_thread_info_struct
char *name;
int suspended;
int reload_context;
- CONTEXT context;
+ union
+ {
+ CONTEXT context;
+#ifdef __x86_64__
+ WOW64_CONTEXT wow64_context;
+#endif
+ };
}
windows_thread_info;
@@ -243,6 +279,10 @@ static int exception_count = 0;
static int event_count = 0;
static int saw_create;
static int open_process_used = 0;
+#ifdef __x86_64__
+static bool wow64_process = false;
+static bool ignore_first_breakpoint = false;
+#endif
/* User options. */
static bool new_console = false;
@@ -452,6 +492,12 @@ windows_add_thread (ptid_t ptid, HANDLE h, void *tlb, bool main_thread_p)
th->id = id;
th->h = h;
th->thread_local_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)
+ th->thread_local_base += 0x2000;
+#endif
th->next = thread_head.next;
thread_head.next = th;
@@ -468,17 +514,36 @@ windows_add_thread (ptid_t ptid, HANDLE h, void *tlb, bool main_thread_p)
/* Set the debug registers for the new thread if they are used. */
if (debug_registers_used)
{
- /* Only change the value of the debug registers. */
- th->context.ContextFlags = CONTEXT_DEBUG_REGISTERS;
- CHECK (GetThreadContext (th->h, &th->context));
- th->context.Dr0 = dr[0];
- th->context.Dr1 = dr[1];
- th->context.Dr2 = dr[2];
- th->context.Dr3 = dr[3];
- th->context.Dr6 = DR6_CLEAR_VALUE;
- th->context.Dr7 = dr[7];
- CHECK (SetThreadContext (th->h, &th->context));
- th->context.ContextFlags = 0;
+#ifdef __x86_64__
+ if (wow64_process)
+ {
+ /* Only change the value of the debug registers. */
+ th->wow64_context.ContextFlags = CONTEXT_DEBUG_REGISTERS;
+ CHECK (Wow64GetThreadContext (th->h, &th->wow64_context));
+ th->wow64_context.Dr0 = dr[0];
+ th->wow64_context.Dr1 = dr[1];
+ th->wow64_context.Dr2 = dr[2];
+ th->wow64_context.Dr3 = dr[3];
+ th->wow64_context.Dr6 = DR6_CLEAR_VALUE;
+ th->wow64_context.Dr7 = dr[7];
+ CHECK (Wow64SetThreadContext (th->h, &th->wow64_context));
+ th->wow64_context.ContextFlags = 0;
+ }
+ else
+#endif
+ {
+ /* Only change the value of the debug registers. */
+ th->context.ContextFlags = CONTEXT_DEBUG_REGISTERS;
+ CHECK (GetThreadContext (th->h, &th->context));
+ th->context.Dr0 = dr[0];
+ th->context.Dr1 = dr[1];
+ th->context.Dr2 = dr[2];
+ th->context.Dr3 = dr[3];
+ th->context.Dr6 = DR6_CLEAR_VALUE;
+ th->context.Dr7 = dr[7];
+ CHECK (SetThreadContext (th->h, &th->context));
+ th->context.ContextFlags = 0;
+ }
}
return th;
}
@@ -565,7 +630,13 @@ windows_fetch_one_register (struct regcache *regcache,
gdb_assert (r >= 0);
gdb_assert (!th->reload_context);
- char *context_offset = ((char *) &th->context) + mappings[r];
+ char *context_ptr = (char *) &th->context;
+#ifdef __x86_64__
+ if (wow64_process)
+ context_ptr = (char *) &th->wow64_context;
+#endif
+
+ char *context_offset = context_ptr + mappings[r];
struct gdbarch *gdbarch = regcache->arch ();
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
@@ -616,6 +687,26 @@ windows_nat_target::fetch_registers (struct regcache *regcache, int r)
have_saved_context = 0;
}
else
+#endif
+#ifdef __x86_64__
+ if (wow64_process)
+ {
+ th->wow64_context.ContextFlags = CONTEXT_DEBUGGER_DR;
+ CHECK (Wow64GetThreadContext (th->h, &th->wow64_context));
+ /* Copy dr values from that thread.
+ But only if there were not modified since last stop.
+ PR gdb/2388 */
+ if (!debug_registers_changed)
+ {
+ dr[0] = th->wow64_context.Dr0;
+ dr[1] = th->wow64_context.Dr1;
+ dr[2] = th->wow64_context.Dr2;
+ dr[3] = th->wow64_context.Dr3;
+ dr[6] = th->wow64_context.Dr6;
+ dr[7] = th->wow64_context.Dr7;
+ }
+ }
+ else
#endif
{
th->context.ContextFlags = CONTEXT_DEBUGGER_DR;
@@ -655,7 +746,13 @@ windows_store_one_register (const struct regcache *regcache,
{
gdb_assert (r >= 0);
- regcache->raw_collect (r, ((char *) &th->context) + mappings[r]);
+ char *context_ptr = (char *) &th->context;
+#ifdef __x86_64__
+ if (wow64_process)
+ context_ptr = (char *) &th->wow64_context;
+#endif
+
+ regcache->raw_collect (r, context_ptr + mappings[r]);
}
/* Store a new register value into the context of the thread tied to
@@ -1043,7 +1140,14 @@ static int
display_selector (HANDLE thread, DWORD sel)
{
LDT_ENTRY info;
- if (GetThreadSelectorEntry (thread, sel, &info))
+ BOOL ret;
+#ifdef __x86_64__
+ if (wow64_process)
+ ret = Wow64GetThreadSelectorEntry (thread, sel, &info);
+ else
+#endif
+ ret = GetThreadSelectorEntry (thread, sel, &info);
+ if (ret)
{
int base, limit;
printf_filtered ("0x%03x: ", (unsigned) sel);
@@ -1127,25 +1231,50 @@ display_selectors (const char * args, int from_tty)
}
if (!args)
{
-
- puts_filtered ("Selector $cs\n");
- display_selector (current_thread->h,
- current_thread->context.SegCs);
- puts_filtered ("Selector $ds\n");
- display_selector (current_thread->h,
- current_thread->context.SegDs);
- puts_filtered ("Selector $es\n");
- display_selector (current_thread->h,
- current_thread->context.SegEs);
- puts_filtered ("Selector $ss\n");
- display_selector (current_thread->h,
- current_thread->context.SegSs);
- puts_filtered ("Selector $fs\n");
- display_selector (current_thread->h,
- current_thread->context.SegFs);
- puts_filtered ("Selector $gs\n");
- display_selector (current_thread->h,
- current_thread->context.SegGs);
+#ifdef __x86_64__
+ if (wow64_process)
+ {
+ puts_filtered ("Selector $cs\n");
+ display_selector (current_thread->h,
+ current_thread->wow64_context.SegCs);
+ puts_filtered ("Selector $ds\n");
+ display_selector (current_thread->h,
+ current_thread->wow64_context.SegDs);
+ puts_filtered ("Selector $es\n");
+ display_selector (current_thread->h,
+ current_thread->wow64_context.SegEs);
+ puts_filtered ("Selector $ss\n");
+ display_selector (current_thread->h,
+ current_thread->wow64_context.SegSs);
+ puts_filtered ("Selector $fs\n");
+ display_selector (current_thread->h,
+ current_thread->wow64_context.SegFs);
+ puts_filtered ("Selector $gs\n");
+ display_selector (current_thread->h,
+ current_thread->wow64_context.SegGs);
+ }
+ else
+#endif
+ {
+ puts_filtered ("Selector $cs\n");
+ display_selector (current_thread->h,
+ current_thread->context.SegCs);
+ puts_filtered ("Selector $ds\n");
+ display_selector (current_thread->h,
+ current_thread->context.SegDs);
+ puts_filtered ("Selector $es\n");
+ display_selector (current_thread->h,
+ current_thread->context.SegEs);
+ puts_filtered ("Selector $ss\n");
+ display_selector (current_thread->h,
+ current_thread->context.SegSs);
+ puts_filtered ("Selector $fs\n");
+ display_selector (current_thread->h,
+ current_thread->context.SegFs);
+ puts_filtered ("Selector $gs\n");
+ display_selector (current_thread->h,
+ current_thread->context.SegGs);
+ }
}
else
{
@@ -1246,6 +1375,19 @@ handle_exception (struct target_waitstatus *ourstatus)
ourstatus->value.sig = GDB_SIGNAL_FPE;
break;
case EXCEPTION_BREAKPOINT:
+#ifdef __x86_64__
+ if (ignore_first_breakpoint)
+ {
+ /* For WOW64 processes, there are always 2 breakpoint exceptions
+ on startup, first a BREAKPOINT for the 64bit ntdll.dll,
+ then a WX86_BREAKPOINT for the 32bit ntdll.dll.
+ Here we only care about the WX86_BREAKPOINT's. */
+ ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
+ ignore_first_breakpoint = false;
+ }
+#endif
+ /* FALLTHROUGH */
+ case STATUS_WX86_BREAKPOINT:
DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_BREAKPOINT");
ourstatus->value.sig = GDB_SIGNAL_TRAP;
break;
@@ -1258,6 +1400,7 @@ handle_exception (struct target_waitstatus *ourstatus)
ourstatus->value.sig = GDB_SIGNAL_INT;
break;
case EXCEPTION_SINGLE_STEP:
+ case STATUS_WX86_SINGLE_STEP:
DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_SINGLE_STEP");
ourstatus->value.sig = GDB_SIGNAL_TRAP;
break;
@@ -1346,29 +1489,62 @@ windows_continue (DWORD continue_status, int id, int killed)
if ((id == -1 || id == (int) th->id)
&& th->suspended)
{
- if (debug_registers_changed)
+#ifdef __x86_64__
+ if (wow64_process)
{
- th->context.ContextFlags |= CONTEXT_DEBUG_REGISTERS;
- th->context.Dr0 = dr[0];
- th->context.Dr1 = dr[1];
- th->context.Dr2 = dr[2];
- th->context.Dr3 = dr[3];
- th->context.Dr6 = DR6_CLEAR_VALUE;
- th->context.Dr7 = dr[7];
+ if (debug_registers_changed)
+ {
+ th->wow64_context.ContextFlags |= CONTEXT_DEBUG_REGISTERS;
+ th->wow64_context.Dr0 = dr[0];
+ th->wow64_context.Dr1 = dr[1];
+ th->wow64_context.Dr2 = dr[2];
+ th->wow64_context.Dr3 = dr[3];
+ th->wow64_context.Dr6 = DR6_CLEAR_VALUE;
+ th->wow64_context.Dr7 = dr[7];
+ }
+ if (th->wow64_context.ContextFlags)
+ {
+ DWORD ec = 0;
+
+ if (GetExitCodeThread (th->h, &ec)
+ && ec == STILL_ACTIVE)
+ {
+ BOOL status = Wow64SetThreadContext (th->h,
+ &th->wow64_context);
+
+ if (!killed)
+ CHECK (status);
+ }
+ th->wow64_context.ContextFlags = 0;
+ }
}
- if (th->context.ContextFlags)
+ else
+#endif
{
- DWORD ec = 0;
-
- if (GetExitCodeThread (th->h, &ec)
- && ec == STILL_ACTIVE)
+ if (debug_registers_changed)
{
- BOOL status = SetThreadContext (th->h, &th->context);
+ th->context.ContextFlags |= CONTEXT_DEBUG_REGISTERS;
+ th->context.Dr0 = dr[0];
+ th->context.Dr1 = dr[1];
+ th->context.Dr2 = dr[2];
+ th->context.Dr3 = dr[3];
+ th->context.Dr6 = DR6_CLEAR_VALUE;
+ th->context.Dr7 = dr[7];
+ }
+ if (th->context.ContextFlags)
+ {
+ DWORD ec = 0;
- if (!killed)
- CHECK (status);
+ if (GetExitCodeThread (th->h, &ec)
+ && ec == STILL_ACTIVE)
+ {
+ BOOL status = SetThreadContext (th->h, &th->context);
+
+ if (!killed)
+ CHECK (status);
+ }
+ th->context.ContextFlags = 0;
}
- th->context.ContextFlags = 0;
}
if (th->suspended > 0)
(void) ResumeThread (th->h);
@@ -1468,28 +1644,59 @@ windows_nat_target::resume (ptid_t ptid, int step, enum gdb_signal sig)
th = thread_rec (inferior_ptid.tid (), FALSE);
if (th)
{
- if (step)
+#ifdef __x86_64__
+ if (wow64_process)
{
- /* Single step by setting t bit. */
- struct regcache *regcache = get_current_regcache ();
- struct gdbarch *gdbarch = regcache->arch ();
- fetch_registers (regcache, gdbarch_ps_regnum (gdbarch));
- th->context.EFlags |= FLAG_TRACE_BIT;
- }
+ if (step)
+ {
+ /* Single step by setting t bit. */
+ struct regcache *regcache = get_current_regcache ();
+ struct gdbarch *gdbarch = regcache->arch ();
+ fetch_registers (regcache, gdbarch_ps_regnum (gdbarch));
+ th->wow64_context.EFlags |= FLAG_TRACE_BIT;
+ }
- if (th->context.ContextFlags)
+ if (th->wow64_context.ContextFlags)
+ {
+ if (debug_registers_changed)
+ {
+ th->wow64_context.Dr0 = dr[0];
+ th->wow64_context.Dr1 = dr[1];
+ th->wow64_context.Dr2 = dr[2];
+ th->wow64_context.Dr3 = dr[3];
+ th->wow64_context.Dr6 = DR6_CLEAR_VALUE;
+ th->wow64_context.Dr7 = dr[7];
+ }
+ CHECK (Wow64SetThreadContext (th->h, &th->wow64_context));
+ th->wow64_context.ContextFlags = 0;
+ }
+ }
+ else
+#endif
{
- if (debug_registers_changed)
+ if (step)
{
- th->context.Dr0 = dr[0];
- th->context.Dr1 = dr[1];
- th->context.Dr2 = dr[2];
- th->context.Dr3 = dr[3];
- th->context.Dr6 = DR6_CLEAR_VALUE;
- th->context.Dr7 = dr[7];
+ /* Single step by setting t bit. */
+ struct regcache *regcache = get_current_regcache ();
+ struct gdbarch *gdbarch = regcache->arch ();
+ fetch_registers (regcache, gdbarch_ps_regnum (gdbarch));
+ th->context.EFlags |= FLAG_TRACE_BIT;
+ }
+
+ if (th->context.ContextFlags)
+ {
+ if (debug_registers_changed)
+ {
+ th->context.Dr0 = dr[0];
+ th->context.Dr1 = dr[1];
+ th->context.Dr2 = dr[2];
+ th->context.Dr3 = dr[3];
+ th->context.Dr6 = DR6_CLEAR_VALUE;
+ th->context.Dr7 = dr[7];
+ }
+ CHECK (SetThreadContext (th->h, &th->context));
+ th->context.ContextFlags = 0;
}
- CHECK (SetThreadContext (th->h, &th->context));
- th->context.ContextFlags = 0;
}
}
@@ -1814,17 +2021,41 @@ windows_add_all_dlls (void)
HMODULE *hmodules;
int i;
- if (EnumProcessModules (current_process_handle, &dummy_hmodule,
- sizeof (HMODULE), &cb_needed) == 0)
- return;
+#ifdef __x86_64__
+ if (wow64_process)
+ {
+ if (EnumProcessModulesEx (current_process_handle, &dummy_hmodule,
+ sizeof (HMODULE), &cb_needed,
+ LIST_MODULES_32BIT) == 0)
+ return;
+ }
+ else
+#endif
+ {
+ if (EnumProcessModules (current_process_handle, &dummy_hmodule,
+ sizeof (HMODULE), &cb_needed) == 0)
+ return;
+ }
if (cb_needed < 1)
return;
hmodules = (HMODULE *) alloca (cb_needed);
- if (EnumProcessModules (current_process_handle, hmodules,
- cb_needed, &cb_needed) == 0)
- return;
+#ifdef __x86_64__
+ if (wow64_process)
+ {
+ if (EnumProcessModulesEx (current_process_handle, hmodules,
+ cb_needed, &cb_needed,
+ LIST_MODULES_32BIT) == 0)
+ return;
+ }
+ else
+#endif
+ {
+ if (EnumProcessModules (current_process_handle, hmodules,
+ cb_needed, &cb_needed) == 0)
+ return;
+ }
for (i = 1; i < (int) (cb_needed / sizeof (HMODULE)); i++)
{
@@ -1879,6 +2110,21 @@ do_initial_windows_stuff (struct target_ops *ops, DWORD pid, int attaching)
clear_proceed_status (0);
init_wait_for_inferior ();
+#ifdef __x86_64__
+ ignore_first_breakpoint = !attaching && wow64_process;
+
+ if (wow64_process)
+ {
+ windows_set_context_register_offsets (i386_mappings);
+ windows_set_segment_register_p (i386_windows_segment_register_p);
+ }
+ else
+ {
+ windows_set_context_register_offsets (amd64_mappings);
+ windows_set_segment_register_p (amd64_windows_segment_register_p);
+ }
+#endif
+
inf = current_inferior ();
inferior_appeared (inf, pid);
inf->attach_flag = attaching;
@@ -2029,6 +2275,17 @@ windows_nat_target::attach (const char *args, int from_tty)
target_pid_to_str (ptid_t (pid)).c_str ());
}
+#ifdef __x86_64__
+ HANDLE h = OpenProcess (PROCESS_QUERY_INFORMATION, FALSE, pid);
+ if (h != NULL)
+ {
+ BOOL wow64;
+ if (IsWow64Process (h, &wow64))
+ wow64_process = wow64;
+ CloseHandle (h);
+ }
+#endif
+
do_initial_windows_stuff (this, pid, 1);
target_terminal::ours ();
}
@@ -2083,9 +2340,21 @@ windows_get_exec_module_filename (char *exe_name_ret, size_t exe_name_max_len)
DWORD cbNeeded;
cbNeeded = 0;
- if (!EnumProcessModules (current_process_handle, &dh_buf,
- sizeof (HMODULE), &cbNeeded) || !cbNeeded)
- return 0;
+#ifdef __x86_64__
+ if (wow64_process)
+ {
+ if (!EnumProcessModulesEx (current_process_handle, &dh_buf,
+ sizeof (HMODULE), &cbNeeded,
+ LIST_MODULES_32BIT) || !cbNeeded)
+ return 0;
+ }
+ else
+#endif
+ {
+ if (!EnumProcessModules (current_process_handle, &dh_buf,
+ sizeof (HMODULE), &cbNeeded) || !cbNeeded)
+ return 0;
+ }
/* We know the executable is always first in the list of modules,
which we just fetched. So no need to fetch more. */
@@ -2843,6 +3112,12 @@ windows_nat_target::create_inferior (const char *exec_file,
error (_("Error creating process %s, (error %u)."),
exec_file, (unsigned) GetLastError ());
+#ifdef __x86_64__
+ BOOL wow64;
+ if (IsWow64Process (pi.hProcess, &wow64))
+ wow64_process = wow64;
+#endif
+
CloseHandle (pi.hThread);
CloseHandle (pi.hProcess);
@@ -3006,19 +3281,40 @@ static enum target_xfer_status
windows_xfer_siginfo (gdb_byte *readbuf, ULONGEST offset, ULONGEST len,
ULONGEST *xfered_len)
{
+ 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 (siginfo_er.ExceptionCode == 0)
return TARGET_XFER_E_IO;
if (readbuf == nullptr)
return TARGET_XFER_E_IO;
- if (offset > sizeof (siginfo_er))
+ if (offset > bufsize)
return TARGET_XFER_E_IO;
- 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);
*xfered_len = len;
return TARGET_XFER_OK;
@@ -3368,6 +3664,12 @@ _initialize_loadable ()
GPA (hm, GetConsoleFontSize);
GPA (hm, DebugActiveProcessStop);
GPA (hm, GetCurrentConsoleFont);
+#ifdef __x86_64__
+ GPA (hm, Wow64SuspendThread);
+ GPA (hm, Wow64GetThreadContext);
+ GPA (hm, Wow64SetThreadContext);
+ GPA (hm, Wow64GetThreadSelectorEntry);
+#endif
}
/* Set variables to dummy versions of these processes if the function
@@ -3390,6 +3692,9 @@ _initialize_loadable ()
if (hm)
{
GPA (hm, EnumProcessModules);
+#ifdef __x86_64__
+ GPA (hm, EnumProcessModulesEx);
+#endif
GPA (hm, GetModuleInformation);
GetModuleFileNameEx = (GetModuleFileNameEx_ftype *)
GetProcAddress (hm, GetModuleFileNameEx_name);
diff --git a/gdb/windows-nat.h b/gdb/windows-nat.h
index e24305ebcd..4be1b2635f 100644
--- a/gdb/windows-nat.h
+++ b/gdb/windows-nat.h
@@ -28,5 +28,19 @@ typedef int (segment_register_p_ftype) (int regnum);
whether a given register is a segment register or not. */
extern void windows_set_segment_register_p (segment_register_p_ftype *fun);
+/* segment_register_p_ftype implementation for x86. */
+int i386_windows_segment_register_p (int regnum);
+
+/* context register offests for x86. */
+extern const int i386_mappings[];
+
+#ifdef __x86_64__
+/* segment_register_p_ftype implementation for amd64. */
+int amd64_windows_segment_register_p (int regnum);
+
+/* context register offests for amd64. */
+extern const int amd64_mappings[];
+#endif
+
#endif
--
2.25.1
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