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author | Hannes Domani <ssbssa@yahoo.de> | 2020-04-24 17:23:59 +0200 |
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committer | Hannes Domani <ssbssa@yahoo.de> | 2020-04-30 18:30:20 +0200 |
commit | 7d186bc04245c5757f396c2d4f8f89f24818628e (patch) | |
tree | cd43bdbf890d076a6a2a8889c0be130e30e8d3e9 /gdbserver/win32-low.cc | |
parent | ee9d1e5f76033cd8432713a76381ade76697df04 (diff) | |
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Implement debugging of WOW64 processes in gdbserver
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.
Diffstat (limited to 'gdbserver/win32-low.cc')
-rw-r--r-- | gdbserver/win32-low.cc | 239 |
1 files changed, 214 insertions, 25 deletions
diff --git a/gdbserver/win32-low.cc b/gdbserver/win32-low.cc index 5a6f0df..4eb63b7 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 } |