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Sweden-Number/programs/winedbg/gdbproxy.c

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/*
* A Win32 based proxy implementing the GBD remote protocol.
* This makes it possible to debug Wine (and any "emulated"
* program) under Linux using GDB.
*
* Copyright (c) Eric Pouech 2002-2004
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
/* Protocol specification can be found here:
* http://sources.redhat.com/gdb/onlinedocs/gdb/Maintenance-Commands.html
*/
#include "config.h"
#include "wine/port.h"
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_SYS_POLL_H
# include <sys/poll.h>
#endif
#ifdef HAVE_SYS_WAIT_H
# include <sys/wait.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
# include <sys/socket.h>
#endif
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
#ifdef HAVE_NETINET_TCP_H
# include <netinet/tcp.h>
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
/* if we don't have poll support on this system
* we won't provide gdb proxy support here...
*/
#ifdef HAVE_POLL
#include "debugger.h"
#include "windef.h"
#include "winbase.h"
#include "tlhelp32.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(winedbg);
struct gdb_context
{
/* gdb information */
int sock;
/* incoming buffer */
char* in_buf;
int in_buf_alloc;
int in_len;
/* split into individual packet */
char* in_packet;
int in_packet_len;
/* outgoing buffer */
char* out_buf;
int out_buf_alloc;
int out_len;
int out_curr_packet;
/* generic GDB thread information */
struct dbg_thread* exec_thread; /* thread used in step & continue */
struct dbg_thread* other_thread; /* thread to be used in any other operation */
/* current Win32 trap env */
unsigned last_sig;
BOOL in_trap;
dbg_ctx_t context;
/* Win32 information */
struct dbg_process* process;
/* Unix environment */
unsigned long wine_segs[3]; /* load addresses of the ELF wine exec segments (text, bss and data) */
};
static BOOL tgt_process_gdbproxy_read(HANDLE hProcess, const void* addr,
void* buffer, SIZE_T len, SIZE_T* rlen)
{
return ReadProcessMemory( hProcess, addr, buffer, len, rlen );
}
static BOOL tgt_process_gdbproxy_write(HANDLE hProcess, void* addr,
const void* buffer, SIZE_T len, SIZE_T* wlen)
{
return WriteProcessMemory( hProcess, addr, buffer, len, wlen );
}
static struct be_process_io be_process_gdbproxy_io =
{
NULL, /* we shouldn't use close_process() in gdbproxy */
tgt_process_gdbproxy_read,
tgt_process_gdbproxy_write
};
/* =============================================== *
* B A S I C M A N I P U L A T I O N S *
* =============================================== *
*/
static inline int hex_from0(char ch)
{
if (ch >= '0' && ch <= '9') return ch - '0';
if (ch >= 'A' && ch <= 'F') return ch - 'A' + 10;
if (ch >= 'a' && ch <= 'f') return ch - 'a' + 10;
assert(0);
return 0;
}
static inline unsigned char hex_to0(int x)
{
assert(x >= 0 && x < 16);
return "0123456789abcdef"[x];
}
static int hex_to_int(const char* src, size_t len)
{
unsigned int returnval = 0;
while (len--)
{
returnval <<= 4;
returnval |= hex_from0(*src++);
}
return returnval;
}
static void hex_from(void* dst, const char* src, size_t len)
{
unsigned char *p = dst;
while (len--)
{
*p++ = (hex_from0(src[0]) << 4) | hex_from0(src[1]);
src += 2;
}
}
static void hex_to(char* dst, const void* src, size_t len)
{
const unsigned char *p = src;
while (len--)
{
*dst++ = hex_to0(*p >> 4);
*dst++ = hex_to0(*p & 0x0F);
p++;
}
}
static unsigned char checksum(const char* ptr, int len)
{
unsigned cksum = 0;
while (len-- > 0)
cksum += (unsigned char)*ptr++;
return cksum;
}
#ifdef __i386__
static const char target_xml[] = "";
#elif defined(__powerpc__)
static const char target_xml[] = "";
#elif defined(__x86_64__)
static const char target_xml[] = "";
#elif defined(__arm__)
static const char target_xml[] =
"l <target><architecture>arm</architecture>\n"
"<feature name=\"org.gnu.gdb.arm.core\">\n"
" <reg name=\"r0\" bitsize=\"32\" type=\"uint32\"/>\n"
" <reg name=\"r1\" bitsize=\"32\" type=\"uint32\"/>\n"
" <reg name=\"r2\" bitsize=\"32\" type=\"uint32\"/>\n"
" <reg name=\"r3\" bitsize=\"32\" type=\"uint32\"/>\n"
" <reg name=\"r4\" bitsize=\"32\" type=\"uint32\"/>\n"
" <reg name=\"r5\" bitsize=\"32\" type=\"uint32\"/>\n"
" <reg name=\"r6\" bitsize=\"32\" type=\"uint32\"/>\n"
" <reg name=\"r7\" bitsize=\"32\" type=\"uint32\"/>\n"
" <reg name=\"r8\" bitsize=\"32\" type=\"uint32\"/>\n"
" <reg name=\"r9\" bitsize=\"32\" type=\"uint32\"/>\n"
" <reg name=\"r10\" bitsize=\"32\" type=\"uint32\"/>\n"
" <reg name=\"r11\" bitsize=\"32\" type=\"uint32\"/>\n"
" <reg name=\"r12\" bitsize=\"32\" type=\"uint32\"/>\n"
" <reg name=\"sp\" bitsize=\"32\" type=\"data_ptr\"/>\n"
" <reg name=\"lr\" bitsize=\"32\"/>\n"
" <reg name=\"pc\" bitsize=\"32\" type=\"code_ptr\"/>\n"
" <reg name=\"cpsr\" bitsize=\"32\"/>\n"
"</feature></target>\n";
#elif defined(__aarch64__)
static const char target_xml[] = "";
#else
# error Define the registers map for your CPU
#endif
static inline void* cpu_register_ptr(struct gdb_context *gdbctx,
dbg_ctx_t *ctx, unsigned idx)
{
assert(idx < gdbctx->process->be_cpu->gdb_num_regs);
return (char*)ctx + gdbctx->process->be_cpu->gdb_register_map[idx].ctx_offset;
}
static inline DWORD64 cpu_register(struct gdb_context *gdbctx,
dbg_ctx_t *ctx, unsigned idx)
{
switch (gdbctx->process->be_cpu->gdb_register_map[idx].ctx_length)
{
case 1: return *(BYTE*)cpu_register_ptr(gdbctx, ctx, idx);
case 2: return *(WORD*)cpu_register_ptr(gdbctx, ctx, idx);
case 4: return *(DWORD*)cpu_register_ptr(gdbctx, ctx, idx);
case 8: return *(DWORD64*)cpu_register_ptr(gdbctx, ctx, idx);
default:
ERR("got unexpected size: %u\n",
(unsigned)gdbctx->process->be_cpu->gdb_register_map[idx].ctx_length);
assert(0);
return 0;
}
}
static inline void cpu_register_hex_from(struct gdb_context *gdbctx,
dbg_ctx_t* ctx, unsigned idx, const char **phex)
{
const struct gdb_register *cpu_register_map = gdbctx->process->be_cpu->gdb_register_map;
if (cpu_register_map[idx].gdb_length == cpu_register_map[idx].ctx_length)
hex_from(cpu_register_ptr(gdbctx, ctx, idx), *phex, cpu_register_map[idx].gdb_length);
else
{
DWORD64 val = 0;
unsigned i;
BYTE b;
for (i = 0; i < cpu_register_map[idx].gdb_length; i++)
{
hex_from(&b, *phex, 1);
*phex += 2;
val += (DWORD64)b << (8 * i);
}
switch (cpu_register_map[idx].ctx_length)
{
case 1: *(BYTE*)cpu_register_ptr(gdbctx, ctx, idx) = (BYTE)val; break;
case 2: *(WORD*)cpu_register_ptr(gdbctx, ctx, idx) = (WORD)val; break;
case 4: *(DWORD*)cpu_register_ptr(gdbctx, ctx, idx) = (DWORD)val; break;
case 8: *(DWORD64*)cpu_register_ptr(gdbctx, ctx, idx) = val; break;
default: assert(0);
}
}
}
/* =============================================== *
* W I N 3 2 D E B U G I N T E R F A C E *
* =============================================== *
*/
static BOOL fetch_context(struct gdb_context *gdbctx, HANDLE h, dbg_ctx_t *ctx)
{
if (!gdbctx->process->be_cpu->get_context(h, ctx))
{
ERR("Failed to get context, error %u\n", GetLastError());
return FALSE;
}
return TRUE;
}
static BOOL handle_exception(struct gdb_context* gdbctx, EXCEPTION_DEBUG_INFO* exc)
{
EXCEPTION_RECORD* rec = &exc->ExceptionRecord;
BOOL ret = FALSE;
switch (rec->ExceptionCode)
{
case EXCEPTION_ACCESS_VIOLATION:
case EXCEPTION_PRIV_INSTRUCTION:
case EXCEPTION_STACK_OVERFLOW:
case EXCEPTION_GUARD_PAGE:
gdbctx->last_sig = SIGSEGV;
ret = TRUE;
break;
case EXCEPTION_DATATYPE_MISALIGNMENT:
gdbctx->last_sig = SIGBUS;
ret = TRUE;
break;
case EXCEPTION_SINGLE_STEP:
/* fall through */
case EXCEPTION_BREAKPOINT:
gdbctx->last_sig = SIGTRAP;
ret = TRUE;
break;
case EXCEPTION_FLT_DENORMAL_OPERAND:
case EXCEPTION_FLT_DIVIDE_BY_ZERO:
case EXCEPTION_FLT_INEXACT_RESULT:
case EXCEPTION_FLT_INVALID_OPERATION:
case EXCEPTION_FLT_OVERFLOW:
case EXCEPTION_FLT_STACK_CHECK:
case EXCEPTION_FLT_UNDERFLOW:
gdbctx->last_sig = SIGFPE;
ret = TRUE;
break;
case EXCEPTION_INT_DIVIDE_BY_ZERO:
case EXCEPTION_INT_OVERFLOW:
gdbctx->last_sig = SIGFPE;
ret = TRUE;
break;
case EXCEPTION_ILLEGAL_INSTRUCTION:
gdbctx->last_sig = SIGILL;
ret = TRUE;
break;
case CONTROL_C_EXIT:
gdbctx->last_sig = SIGINT;
ret = TRUE;
break;
case STATUS_POSSIBLE_DEADLOCK:
gdbctx->last_sig = SIGALRM;
ret = TRUE;
/* FIXME: we could also add here a O packet with additional information */
break;
case EXCEPTION_NAME_THREAD:
{
const THREADNAME_INFO *threadname = (const THREADNAME_INFO *)rec->ExceptionInformation;
struct dbg_thread *thread;
char name[9];
SIZE_T read;
if (threadname->dwThreadID == -1)
thread = dbg_curr_thread;
else
thread = dbg_get_thread(gdbctx->process, threadname->dwThreadID);
if (thread)
{
if (gdbctx->process->process_io->read( gdbctx->process->handle,
threadname->szName, name, sizeof(name), &read) && read == sizeof(name))
{
fprintf(stderr, "Thread ID=%04x renamed to \"%.9s\"\n",
threadname->dwThreadID, name);
}
}
else
ERR("Cannot set name of thread %04x\n", threadname->dwThreadID);
return DBG_CONTINUE;
}
case EXCEPTION_INVALID_HANDLE:
return DBG_CONTINUE;
default:
fprintf(stderr, "Unhandled exception code 0x%08x\n", rec->ExceptionCode);
gdbctx->last_sig = SIGABRT;
ret = TRUE;
break;
}
return ret;
}
static void handle_debug_event(struct gdb_context* gdbctx, DEBUG_EVENT* de)
{
union {
char bufferA[256];
WCHAR buffer[256];
} u;
dbg_curr_thread = dbg_get_thread(gdbctx->process, de->dwThreadId);
switch (de->dwDebugEventCode)
{
case CREATE_PROCESS_DEBUG_EVENT:
gdbctx->process = dbg_add_process(&be_process_gdbproxy_io, de->dwProcessId,
de->u.CreateProcessInfo.hProcess);
if (!gdbctx->process) break;
memory_get_string_indirect(gdbctx->process,
de->u.CreateProcessInfo.lpImageName,
de->u.CreateProcessInfo.fUnicode,
u.buffer, ARRAY_SIZE(u.buffer));
dbg_set_process_name(gdbctx->process, u.buffer);
fprintf(stderr, "%04x:%04x: create process '%s'/%p @%p (%u<%u>)\n",
de->dwProcessId, de->dwThreadId,
dbg_W2A(u.buffer, -1),
de->u.CreateProcessInfo.lpImageName,
de->u.CreateProcessInfo.lpStartAddress,
de->u.CreateProcessInfo.dwDebugInfoFileOffset,
de->u.CreateProcessInfo.nDebugInfoSize);
/* de->u.CreateProcessInfo.lpStartAddress; */
if (!dbg_init(gdbctx->process->handle, u.buffer, TRUE))
ERR("Couldn't initiate DbgHelp\n");
fprintf(stderr, "%04x:%04x: create thread I @%p\n", de->dwProcessId,
de->dwThreadId, de->u.CreateProcessInfo.lpStartAddress);
assert(dbg_curr_thread == NULL); /* shouldn't be there */
dbg_add_thread(gdbctx->process, de->dwThreadId,
de->u.CreateProcessInfo.hThread,
de->u.CreateProcessInfo.lpThreadLocalBase);
break;
case LOAD_DLL_DEBUG_EVENT:
assert(dbg_curr_thread);
memory_get_string_indirect(gdbctx->process,
de->u.LoadDll.lpImageName,
de->u.LoadDll.fUnicode,
u.buffer, ARRAY_SIZE(u.buffer));
fprintf(stderr, "%04x:%04x: loads DLL %s @%p (%u<%u>)\n",
de->dwProcessId, de->dwThreadId,
dbg_W2A(u.buffer, -1),
de->u.LoadDll.lpBaseOfDll,
de->u.LoadDll.dwDebugInfoFileOffset,
de->u.LoadDll.nDebugInfoSize);
dbg_load_module(gdbctx->process->handle, de->u.LoadDll.hFile, u.buffer,
(DWORD_PTR)de->u.LoadDll.lpBaseOfDll, 0);
break;
case UNLOAD_DLL_DEBUG_EVENT:
fprintf(stderr, "%08x:%08x: unload DLL @%p\n",
de->dwProcessId, de->dwThreadId, de->u.UnloadDll.lpBaseOfDll);
SymUnloadModule(gdbctx->process->handle,
(DWORD_PTR)de->u.UnloadDll.lpBaseOfDll);
break;
case EXCEPTION_DEBUG_EVENT:
assert(dbg_curr_thread);
TRACE("%08x:%08x: exception code=0x%08x\n", de->dwProcessId,
de->dwThreadId, de->u.Exception.ExceptionRecord.ExceptionCode);
if (fetch_context(gdbctx, dbg_curr_thread->handle, &gdbctx->context))
{
gdbctx->in_trap = handle_exception(gdbctx, &de->u.Exception);
}
break;
case CREATE_THREAD_DEBUG_EVENT:
fprintf(stderr, "%08x:%08x: create thread D @%p\n", de->dwProcessId,
de->dwThreadId, de->u.CreateThread.lpStartAddress);
dbg_add_thread(gdbctx->process,
de->dwThreadId,
de->u.CreateThread.hThread,
de->u.CreateThread.lpThreadLocalBase);
break;
case EXIT_THREAD_DEBUG_EVENT:
fprintf(stderr, "%08x:%08x: exit thread (%u)\n",
de->dwProcessId, de->dwThreadId, de->u.ExitThread.dwExitCode);
assert(dbg_curr_thread);
if (dbg_curr_thread == gdbctx->exec_thread) gdbctx->exec_thread = NULL;
if (dbg_curr_thread == gdbctx->other_thread) gdbctx->other_thread = NULL;
dbg_del_thread(dbg_curr_thread);
break;
case EXIT_PROCESS_DEBUG_EVENT:
fprintf(stderr, "%08x:%08x: exit process (%u)\n",
de->dwProcessId, de->dwThreadId, de->u.ExitProcess.dwExitCode);
dbg_del_process(gdbctx->process);
gdbctx->process = NULL;
/* now signal gdb that we're done */
gdbctx->last_sig = SIGTERM;
gdbctx->in_trap = TRUE;
break;
case OUTPUT_DEBUG_STRING_EVENT:
assert(dbg_curr_thread);
memory_get_string(gdbctx->process,
de->u.DebugString.lpDebugStringData, TRUE,
de->u.DebugString.fUnicode, u.bufferA, sizeof(u.bufferA));
fprintf(stderr, "%08x:%08x: output debug string (%s)\n",
de->dwProcessId, de->dwThreadId, debugstr_a(u.bufferA));
break;
case RIP_EVENT:
fprintf(stderr, "%08x:%08x: rip error=%u type=%u\n", de->dwProcessId,
de->dwThreadId, de->u.RipInfo.dwError, de->u.RipInfo.dwType);
break;
default:
FIXME("%08x:%08x: unknown event (%u)\n",
de->dwProcessId, de->dwThreadId, de->dwDebugEventCode);
}
}
static void resume_debuggee(struct gdb_context* gdbctx, DWORD cont)
{
if (dbg_curr_thread)
{
if (!gdbctx->process->be_cpu->set_context(dbg_curr_thread->handle, &gdbctx->context))
ERR("Failed to set context for thread %04x, error %u\n",
dbg_curr_thread->tid, GetLastError());
if (!ContinueDebugEvent(gdbctx->process->pid, dbg_curr_thread->tid, cont))
ERR("Failed to continue thread %04x, error %u\n",
dbg_curr_thread->tid, GetLastError());
}
else
ERR("Cannot find last thread\n");
}
static void resume_debuggee_thread(struct gdb_context* gdbctx, DWORD cont, unsigned int threadid)
{
if (dbg_curr_thread)
{
if(dbg_curr_thread->tid == threadid){
/* Windows debug and GDB don't seem to work well here, windows only likes ContinueDebugEvent being used on the reporter of the event */
if (!gdbctx->process->be_cpu->set_context(dbg_curr_thread->handle, &gdbctx->context))
ERR("Failed to set context for thread %04x, error %u\n",
dbg_curr_thread->tid, GetLastError());
if (!ContinueDebugEvent(gdbctx->process->pid, dbg_curr_thread->tid, cont))
ERR("Failed to continue thread %04x, error %u\n",
dbg_curr_thread->tid, GetLastError());
}
}
else
ERR("Cannot find last thread\n");
}
static BOOL check_for_interrupt(struct gdb_context* gdbctx)
{
struct pollfd pollfd;
int ret;
char pkt;
pollfd.fd = gdbctx->sock;
pollfd.events = POLLIN;
pollfd.revents = 0;
if ((ret = poll(&pollfd, 1, 0)) == 1) {
ret = read(gdbctx->sock, &pkt, 1);
if (ret != 1) {
ERR("read failed\n");
return FALSE;
}
if (pkt != '\003') {
ERR("Unexpected break packet %#02x\n", pkt);
return FALSE;
}
return TRUE;
} else if (ret == -1) {
ERR("poll failed\n");
}
return FALSE;
}
static void wait_for_debuggee(struct gdb_context* gdbctx)
{
DEBUG_EVENT de;
gdbctx->in_trap = FALSE;
for (;;)
{
if (!WaitForDebugEvent(&de, 10))
{
if (GetLastError() == ERROR_SEM_TIMEOUT)
{
if (check_for_interrupt(gdbctx)) {
if (!DebugBreakProcess(gdbctx->process->handle)) {
ERR("Failed to break into debugee\n");
break;
}
WaitForDebugEvent(&de, INFINITE);
} else {
continue;
}
} else {
break;
}
}
handle_debug_event(gdbctx, &de);
assert(!gdbctx->process ||
gdbctx->process->pid == 0 ||
de.dwProcessId == gdbctx->process->pid);
assert(!dbg_curr_thread || de.dwThreadId == dbg_curr_thread->tid);
if (gdbctx->in_trap) break;
ContinueDebugEvent(de.dwProcessId, de.dwThreadId, DBG_CONTINUE);
}
}
static void detach_debuggee(struct gdb_context* gdbctx, BOOL kill)
{
assert(gdbctx->process->be_cpu);
gdbctx->process->be_cpu->single_step(&gdbctx->context, FALSE);
resume_debuggee(gdbctx, DBG_CONTINUE);
if (!kill)
DebugActiveProcessStop(gdbctx->process->pid);
dbg_del_process(gdbctx->process);
gdbctx->process = NULL;
}
static void get_process_info(struct gdb_context* gdbctx, char* buffer, size_t len)
{
DWORD status;
if (!GetExitCodeProcess(gdbctx->process->handle, &status))
{
strcpy(buffer, "Unknown process");
return;
}
if (status == STILL_ACTIVE)
{
strcpy(buffer, "Running");
}
else
snprintf(buffer, len, "Terminated (%u)", status);
switch (GetPriorityClass(gdbctx->process->handle))
{
case 0: break;
#ifdef ABOVE_NORMAL_PRIORITY_CLASS
case ABOVE_NORMAL_PRIORITY_CLASS: strcat(buffer, ", above normal priority"); break;
#endif
#ifdef BELOW_NORMAL_PRIORITY_CLASS
case BELOW_NORMAL_PRIORITY_CLASS: strcat(buffer, ", below normal priotity"); break;
#endif
case HIGH_PRIORITY_CLASS: strcat(buffer, ", high priority"); break;
case IDLE_PRIORITY_CLASS: strcat(buffer, ", idle priority"); break;
case NORMAL_PRIORITY_CLASS: strcat(buffer, ", normal priority"); break;
case REALTIME_PRIORITY_CLASS: strcat(buffer, ", realtime priority"); break;
}
strcat(buffer, "\n");
}
static void get_thread_info(struct gdb_context* gdbctx, unsigned tid,
char* buffer, size_t len)
{
struct dbg_thread* thd;
DWORD status;
int prio;
/* FIXME: use the size of buffer */
thd = dbg_get_thread(gdbctx->process, tid);
if (thd == NULL)
{
strcpy(buffer, "No information");
return;
}
if (GetExitCodeThread(thd->handle, &status))
{
if (status == STILL_ACTIVE)
{
/* FIXME: this is a bit brutal... some nicer way shall be found */
switch (status = SuspendThread(thd->handle))
{
case -1: break;
case 0: strcpy(buffer, "Running"); break;
default: snprintf(buffer, len, "Suspended (%u)", status - 1);
}
ResumeThread(thd->handle);
}
else
snprintf(buffer, len, "Terminated (exit code = %u)", status);
}
else
{
strcpy(buffer, "Unknown threadID");
}
switch (prio = GetThreadPriority(thd->handle))
{
case THREAD_PRIORITY_ERROR_RETURN: break;
case THREAD_PRIORITY_ABOVE_NORMAL: strcat(buffer, ", priority +1 above normal"); break;
case THREAD_PRIORITY_BELOW_NORMAL: strcat(buffer, ", priority -1 below normal"); break;
case THREAD_PRIORITY_HIGHEST: strcat(buffer, ", priority +2 above normal"); break;
case THREAD_PRIORITY_LOWEST: strcat(buffer, ", priority -2 below normal"); break;
case THREAD_PRIORITY_IDLE: strcat(buffer, ", priority idle"); break;
case THREAD_PRIORITY_NORMAL: strcat(buffer, ", priority normal"); break;
case THREAD_PRIORITY_TIME_CRITICAL: strcat(buffer, ", priority time-critical"); break;
default: snprintf(buffer + strlen(buffer), len - strlen(buffer), ", priority = %d", prio);
}
assert(strlen(buffer) < len);
}
/* =============================================== *
* P A C K E T U T I L S *
* =============================================== *
*/
enum packet_return {packet_error = 0x00, packet_ok = 0x01, packet_done = 0x02,
packet_last_f = 0x80};
static char* packet_realloc(char* buf, int size)
{
if (!buf)
return HeapAlloc(GetProcessHeap(), 0, size);
return HeapReAlloc(GetProcessHeap(), 0, buf, size);
}
static void packet_reply_grow(struct gdb_context* gdbctx, size_t size)
{
if (gdbctx->out_buf_alloc < gdbctx->out_len + size)
{
gdbctx->out_buf_alloc = ((gdbctx->out_len + size) / 32 + 1) * 32;
gdbctx->out_buf = packet_realloc(gdbctx->out_buf, gdbctx->out_buf_alloc);
}
}
static void packet_reply_hex_to(struct gdb_context* gdbctx, const void* src, int len)
{
packet_reply_grow(gdbctx, len * 2);
hex_to(&gdbctx->out_buf[gdbctx->out_len], src, len);
gdbctx->out_len += len * 2;
}
static inline void packet_reply_hex_to_str(struct gdb_context* gdbctx, const char* src)
{
packet_reply_hex_to(gdbctx, src, strlen(src));
}
static void packet_reply_val(struct gdb_context* gdbctx, unsigned long val, int len)
{
int i, shift;
shift = (len - 1) * 8;
packet_reply_grow(gdbctx, len * 2);
for (i = 0; i < len; i++, shift -= 8)
{
gdbctx->out_buf[gdbctx->out_len++] = hex_to0((val >> (shift + 4)) & 0x0F);
gdbctx->out_buf[gdbctx->out_len++] = hex_to0((val >> shift ) & 0x0F);
}
}
static inline void packet_reply_add(struct gdb_context* gdbctx, const char* str, int len)
{
packet_reply_grow(gdbctx, len);
memcpy(&gdbctx->out_buf[gdbctx->out_len], str, len);
gdbctx->out_len += len;
}
static inline void packet_reply_cat(struct gdb_context* gdbctx, const char* str)
{
packet_reply_add(gdbctx, str, strlen(str));
}
static inline void packet_reply_catc(struct gdb_context* gdbctx, char ch)
{
packet_reply_add(gdbctx, &ch, 1);
}
static void packet_reply_open(struct gdb_context* gdbctx)
{
assert(gdbctx->out_curr_packet == -1);
packet_reply_catc(gdbctx, '$');
gdbctx->out_curr_packet = gdbctx->out_len;
}
static void packet_reply_close(struct gdb_context* gdbctx)
{
unsigned char cksum;
int plen;
plen = gdbctx->out_len - gdbctx->out_curr_packet;
packet_reply_catc(gdbctx, '#');
cksum = checksum(&gdbctx->out_buf[gdbctx->out_curr_packet], plen);
packet_reply_hex_to(gdbctx, &cksum, 1);
gdbctx->out_curr_packet = -1;
}
static enum packet_return packet_reply(struct gdb_context* gdbctx, const char* packet, int len)
{
packet_reply_open(gdbctx);
if (len == -1) len = strlen(packet);
assert(memchr(packet, '$', len) == NULL && memchr(packet, '#', len) == NULL);
packet_reply_add(gdbctx, packet, len);
packet_reply_close(gdbctx);
return packet_done;
}
static enum packet_return packet_reply_error(struct gdb_context* gdbctx, int error)
{
packet_reply_open(gdbctx);
packet_reply_add(gdbctx, "E", 1);
packet_reply_val(gdbctx, error, 1);
packet_reply_close(gdbctx);
return packet_done;
}
static inline void packet_reply_register_hex_to(struct gdb_context* gdbctx, unsigned idx)
{
const struct gdb_register *cpu_register_map = gdbctx->process->be_cpu->gdb_register_map;
if (cpu_register_map[idx].gdb_length == cpu_register_map[idx].ctx_length)
packet_reply_hex_to(gdbctx, cpu_register_ptr(gdbctx, &gdbctx->context, idx),
cpu_register_map[idx].gdb_length);
else
{
DWORD64 val = cpu_register(gdbctx, &gdbctx->context, idx);
unsigned i;
for (i = 0; i < cpu_register_map[idx].gdb_length; i++)
{
BYTE b = val;
packet_reply_hex_to(gdbctx, &b, 1);
val >>= 8;
}
}
}
/* =============================================== *
* P A C K E T H A N D L E R S *
* =============================================== *
*/
static enum packet_return packet_reply_status(struct gdb_context* gdbctx)
{
enum packet_return ret = packet_done;
packet_reply_open(gdbctx);
if (gdbctx->process != NULL)
{
unsigned char sig;
unsigned i;
packet_reply_catc(gdbctx, 'T');
sig = gdbctx->last_sig;
packet_reply_val(gdbctx, sig, 1);
packet_reply_add(gdbctx, "thread:", 7);
packet_reply_val(gdbctx, dbg_curr_thread->tid, 4);
packet_reply_catc(gdbctx, ';');
for (i = 0; i < gdbctx->process->be_cpu->gdb_num_regs; i++)
{
/* FIXME: this call will also grow the buffer...
* unneeded, but not harmful
*/
packet_reply_val(gdbctx, i, 1);
packet_reply_catc(gdbctx, ':');
packet_reply_register_hex_to(gdbctx, i);
packet_reply_catc(gdbctx, ';');
}
}
else
{
/* Try to put an exit code
* Cannot use GetExitCodeProcess, wouldn't fit in a 8 bit value, so
* just indicate the end of process and exit */
packet_reply_add(gdbctx, "W00", 3);
/*if (!gdbctx->extended)*/ ret |= packet_last_f;
}
packet_reply_close(gdbctx);
return ret;
}
#if 0
static enum packet_return packet_extended(struct gdb_context* gdbctx)
{
gdbctx->extended = 1;
return packet_ok;
}
#endif
static enum packet_return packet_last_signal(struct gdb_context* gdbctx)
{
assert(gdbctx->in_packet_len == 0);
return packet_reply_status(gdbctx);
}
static enum packet_return packet_continue(struct gdb_context* gdbctx)
{
/* FIXME: add support for address in packet */
assert(gdbctx->in_packet_len == 0);
if (dbg_curr_thread != gdbctx->exec_thread && gdbctx->exec_thread)
FIXME("Can't continue thread %04x while on thread %04x\n",
gdbctx->exec_thread->tid, dbg_curr_thread->tid);
resume_debuggee(gdbctx, DBG_CONTINUE);
wait_for_debuggee(gdbctx);
return packet_reply_status(gdbctx);
}
static enum packet_return packet_verbose_cont(struct gdb_context* gdbctx)
{
int i;
int defaultAction = -1; /* magic non action */
unsigned char sig;
int actions =0;
int actionIndex[20]; /* allow for up to 20 actions */
int threadIndex[20];
int threadCount = 0;
unsigned int threadIDs[100]; /* TODO: Should make this dynamic */
unsigned int threadID = 0;
struct dbg_thread* thd;
/* OK we have vCont followed by..
* ? for query
* c for packet_continue
* Csig for packet_continue_signal
* s for step
* Ssig for step signal
* and then an optional thread ID at the end..
* *******************************************/
/* Query */
if (gdbctx->in_packet[4] == '?')
{
/*
Reply:
`vCont[;action]...'
The vCont packet is supported. Each action is a supported command in the vCont packet.
`'
The vCont packet is not supported. (this didn't seem to be obeyed!)
*/
packet_reply_open(gdbctx);
packet_reply_add(gdbctx, "vCont", 5);
/* add all the supported actions to the reply (all of them for now) */
packet_reply_add(gdbctx, ";c", 2);
packet_reply_add(gdbctx, ";C", 2);
packet_reply_add(gdbctx, ";s", 2);
packet_reply_add(gdbctx, ";S", 2);
packet_reply_close(gdbctx);
return packet_done;
}
/* go through the packet and identify where all the actions start at */
for (i = 4; i < gdbctx->in_packet_len - 1; i++)
{
if (gdbctx->in_packet[i] == ';')
{
threadIndex[actions] = 0;
actionIndex[actions++] = i;
}
else if (gdbctx->in_packet[i] == ':')
{
threadIndex[actions - 1] = i;
}
}
/* now look up the default action */
for (i = 0 ; i < actions; i++)
{
if (threadIndex[i] == 0)
{
if (defaultAction != -1)
{
fprintf(stderr,"Too many default actions specified\n");
return packet_error;
}
defaultAction = i;
}
}
/* Now, I have this default action thing that needs to be applied to all non counted threads */
/* go through all the threads and stick their ids in the to be done list. */
LIST_FOR_EACH_ENTRY(thd, &gdbctx->process->threads, struct dbg_thread, entry)
{
threadIDs[threadCount++] = thd->tid;
/* check to see if we have more threads than I counted on, and tell the user what to do
* (they're running winedbg, so I'm sure they can fix the problem from the error message!) */
if (threadCount == 100)
{
fprintf(stderr, "Wow, that's a lot of threads, change threadIDs in wine/programs/winedbg/gdbproxy.c to be higher\n");
break;
}
}
/* Ok, now we have... actionIndex full of actions and we know what threads there are, so all
* that remains is to apply the actions to the threads and the default action to any threads
* left */
if (dbg_curr_thread != gdbctx->exec_thread && gdbctx->exec_thread)
FIXME("Can't continue thread %04x while on thread %04x\n",
gdbctx->exec_thread->tid, dbg_curr_thread->tid);
/* deal with the threaded stuff first */
for (i = 0; i < actions ; i++)
{
if (threadIndex[i] != 0)
{
int j, idLength = 0;
if (i < actions - 1)
{
idLength = (actionIndex[i+1] - threadIndex[i]) - 1;
}
else
{
idLength = (gdbctx->in_packet_len - threadIndex[i]) - 1;
}
threadID = hex_to_int(gdbctx->in_packet + threadIndex[i] + 1 , idLength);
/* process the action */
switch (gdbctx->in_packet[actionIndex[i] + 1])
{
case 's': /* step */
gdbctx->process->be_cpu->single_step(&gdbctx->context, TRUE);
/* fall through*/
case 'c': /* continue */
resume_debuggee_thread(gdbctx, DBG_CONTINUE, threadID);
break;
case 'S': /* step Sig, */
gdbctx->process->be_cpu->single_step(&gdbctx->context, TRUE);
/* fall through */
case 'C': /* continue sig */
hex_from(&sig, gdbctx->in_packet + actionIndex[i] + 2, 1);
/* cannot change signals on the fly */
TRACE("sigs: %u %u\n", sig, gdbctx->last_sig);
if (sig != gdbctx->last_sig)
return packet_error;
resume_debuggee_thread(gdbctx, DBG_EXCEPTION_NOT_HANDLED, threadID);
break;
}
for (j = 0 ; j < threadCount; j++)
{
if (threadIDs[j] == threadID)
{
threadIDs[j] = 0;
break;
}
}
}
} /* for i=0 ; i< actions */
/* now we have manage the default action */
if (defaultAction >= 0)
{
for (i = 0 ; i< threadCount; i++)
{
/* check to see if we've already done something to the thread*/
if (threadIDs[i] != 0)
{
/* if not apply the default action*/
threadID = threadIDs[i];
/* process the action (yes this is almost identical to the one above!) */
switch (gdbctx->in_packet[actionIndex[defaultAction] + 1])
{
case 's': /* step */
gdbctx->process->be_cpu->single_step(&gdbctx->context, TRUE);
/* fall through */
case 'c': /* continue */
resume_debuggee_thread(gdbctx, DBG_CONTINUE, threadID);
break;
case 'S':
gdbctx->process->be_cpu->single_step(&gdbctx->context, TRUE);
/* fall through */
case 'C': /* continue sig */
hex_from(&sig, gdbctx->in_packet + actionIndex[defaultAction] + 2, 1);
/* cannot change signals on the fly */
TRACE("sigs: %u %u\n", sig, gdbctx->last_sig);
if (sig != gdbctx->last_sig)
return packet_error;
resume_debuggee_thread(gdbctx, DBG_EXCEPTION_NOT_HANDLED, threadID);
break;
}
}
}
} /* if(defaultAction >=0) */
wait_for_debuggee(gdbctx);
if (gdbctx->process)
gdbctx->process->be_cpu->single_step(&gdbctx->context, FALSE);
return packet_reply_status(gdbctx);
}
static enum packet_return packet_verbose(struct gdb_context* gdbctx)
{
if (gdbctx->in_packet_len >= 4 && !memcmp(gdbctx->in_packet, "Cont", 4))
{
return packet_verbose_cont(gdbctx);
}
WARN("Unhandled verbose packet %s\n",
debugstr_an(gdbctx->in_packet, gdbctx->in_packet_len));
return packet_error;
}
static enum packet_return packet_continue_signal(struct gdb_context* gdbctx)
{
unsigned char sig;
/* FIXME: add support for address in packet */
assert(gdbctx->in_packet_len == 2);
if (dbg_curr_thread != gdbctx->exec_thread && gdbctx->exec_thread)
FIXME("Can't continue thread %04x while on thread %04x\n",
gdbctx->exec_thread->tid, dbg_curr_thread->tid);
hex_from(&sig, gdbctx->in_packet, 1);
/* cannot change signals on the fly */
TRACE("sigs: %u %u\n", sig, gdbctx->last_sig);
if (sig != gdbctx->last_sig)
return packet_error;
resume_debuggee(gdbctx, DBG_EXCEPTION_NOT_HANDLED);
wait_for_debuggee(gdbctx);
return packet_reply_status(gdbctx);
}
static enum packet_return packet_detach(struct gdb_context* gdbctx)
{
detach_debuggee(gdbctx, FALSE);
return packet_ok | packet_last_f;
}
static enum packet_return packet_read_registers(struct gdb_context* gdbctx)
{
int i;
dbg_ctx_t ctx;
assert(gdbctx->in_trap);
if (dbg_curr_thread != gdbctx->other_thread && gdbctx->other_thread)
{
if (!fetch_context(gdbctx, gdbctx->other_thread->handle, &ctx))
return packet_error;
}
packet_reply_open(gdbctx);
for (i = 0; i < gdbctx->process->be_cpu->gdb_num_regs; i++)
packet_reply_register_hex_to(gdbctx, i);
packet_reply_close(gdbctx);
return packet_done;
}
static enum packet_return packet_write_registers(struct gdb_context* gdbctx)
{
const size_t cpu_num_regs = gdbctx->process->be_cpu->gdb_num_regs;
unsigned i;
dbg_ctx_t ctx;
dbg_ctx_t *pctx = &gdbctx->context;
const char* ptr;
assert(gdbctx->in_trap);
if (dbg_curr_thread != gdbctx->other_thread && gdbctx->other_thread)
{
if (!fetch_context(gdbctx, gdbctx->other_thread->handle, pctx = &ctx))
return packet_error;
}
if (gdbctx->in_packet_len < cpu_num_regs * 2) return packet_error;
ptr = gdbctx->in_packet;
for (i = 0; i < cpu_num_regs; i++)
cpu_register_hex_from(gdbctx, pctx, i, &ptr);
if (pctx != &gdbctx->context &&
!gdbctx->process->be_cpu->set_context(gdbctx->other_thread->handle, pctx))
{
ERR("Failed to set context for tid %04x, error %u\n",
gdbctx->other_thread->tid, GetLastError());
return packet_error;
}
return packet_ok;
}
static enum packet_return packet_kill(struct gdb_context* gdbctx)
{
detach_debuggee(gdbctx, TRUE);
#if 0
if (!gdbctx->extended)
/* dunno whether GDB cares or not */
#endif
wait(NULL);
exit(0);
/* assume we can't really answer something here */
/* return packet_done; */
}
static enum packet_return packet_thread(struct gdb_context* gdbctx)
{
char* end;
unsigned thread;
switch (gdbctx->in_packet[0])
{
case 'c':
case 'g':
if (gdbctx->in_packet[1] == '-')
thread = -strtol(gdbctx->in_packet + 2, &end, 16);
else
thread = strtol(gdbctx->in_packet + 1, &end, 16);
if (end == NULL || end > gdbctx->in_packet + gdbctx->in_packet_len)
{
ERR("Failed to parse %s\n",
debugstr_an(gdbctx->in_packet, gdbctx->in_packet_len));
return packet_error;
}
if (gdbctx->in_packet[0] == 'c')
gdbctx->exec_thread = dbg_get_thread(gdbctx->process, thread);
else
gdbctx->other_thread = dbg_get_thread(gdbctx->process, thread);
return packet_ok;
default:
FIXME("Unknown thread sub-command %c\n", gdbctx->in_packet[0]);
return packet_error;
}
}
static enum packet_return packet_read_memory(struct gdb_context* gdbctx)
{
char *addr;
unsigned int len, blk_len, nread;
char buffer[32];
SIZE_T r = 0;
assert(gdbctx->in_trap);
/* FIXME:check in_packet_len for reading %p,%x */
if (sscanf(gdbctx->in_packet, "%p,%x", &addr, &len) != 2) return packet_error;
if (len <= 0) return packet_error;
TRACE("Read %u bytes at %p\n", len, addr);
for (nread = 0; nread < len; nread += r, addr += r)
{
blk_len = min(sizeof(buffer), len - nread);
if (!gdbctx->process->process_io->read(gdbctx->process->handle, addr,
buffer, blk_len, &r) || r == 0)
{
/* fail at first address, return error */
if (nread == 0) return packet_reply_error(gdbctx, EFAULT);
/* something has already been read, return partial information */
break;
}
if (nread == 0) packet_reply_open(gdbctx);
packet_reply_hex_to(gdbctx, buffer, r);
}
packet_reply_close(gdbctx);
return packet_done;
}
static enum packet_return packet_write_memory(struct gdb_context* gdbctx)
{
char* addr;
unsigned int len, blk_len;
char* ptr;
char buffer[32];
SIZE_T w;
assert(gdbctx->in_trap);
ptr = memchr(gdbctx->in_packet, ':', gdbctx->in_packet_len);
if (ptr == NULL)
{
ERR("Cannot find ':' in %s\n", debugstr_an(gdbctx->in_packet, gdbctx->in_packet_len));
return packet_error;
}
*ptr++ = '\0';
if (sscanf(gdbctx->in_packet, "%p,%x", &addr, &len) != 2)
{
ERR("Failed to parse %s\n", debugstr_a(gdbctx->in_packet));
return packet_error;
}
if (ptr - gdbctx->in_packet + len * 2 != gdbctx->in_packet_len)
{
ERR("Length %u does not match packet length %u\n",
(int)(ptr - gdbctx->in_packet) + len * 2, gdbctx->in_packet_len);
return packet_error;
}
TRACE("Write %u bytes at %p\n", len, addr);
while (len > 0)
{
blk_len = min(sizeof(buffer), len);
hex_from(buffer, ptr, blk_len);
if (!gdbctx->process->process_io->write(gdbctx->process->handle, addr, buffer, blk_len, &w) ||
w != blk_len)
break;
addr += blk_len;
len -= blk_len;
ptr += blk_len;
}
return packet_ok; /* FIXME: error while writing ? */
}
static enum packet_return packet_read_register(struct gdb_context* gdbctx)
{
unsigned reg;
dbg_ctx_t ctx;
dbg_ctx_t *pctx = &gdbctx->context;
assert(gdbctx->in_trap);
reg = hex_to_int(gdbctx->in_packet, gdbctx->in_packet_len);
if (reg >= gdbctx->process->be_cpu->gdb_num_regs)
{
WARN("Unhandled register %u\n", reg);
return packet_error;
}
if (dbg_curr_thread != gdbctx->other_thread && gdbctx->other_thread)
{
if (!fetch_context(gdbctx, gdbctx->other_thread->handle, pctx = &ctx))
return packet_error;
}
TRACE("%u => %s\n", reg, wine_dbgstr_longlong(cpu_register(gdbctx, pctx, reg)));
packet_reply_open(gdbctx);
packet_reply_register_hex_to(gdbctx, reg);
packet_reply_close(gdbctx);
return packet_done;
}
static enum packet_return packet_write_register(struct gdb_context* gdbctx)
{
unsigned reg;
char* ptr;
dbg_ctx_t ctx;
dbg_ctx_t *pctx = &gdbctx->context;
assert(gdbctx->in_trap);
reg = strtoul(gdbctx->in_packet, &ptr, 16);
if (ptr == NULL || reg >= gdbctx->process->be_cpu->gdb_num_regs || *ptr++ != '=')
{
WARN("Unhandled register %s\n",
debugstr_an(gdbctx->in_packet, gdbctx->in_packet_len));
/* FIXME: if just the reg is above cpu_num_regs, don't tell gdb
* it wouldn't matter too much, and it fakes our support for all regs
*/
return (ptr == NULL) ? packet_error : packet_ok;
}
TRACE("%u <= %s\n", reg,
debugstr_an(ptr, (int)(gdbctx->in_packet_len - (ptr - gdbctx->in_packet))));
if (dbg_curr_thread != gdbctx->other_thread && gdbctx->other_thread)
{
if (!fetch_context(gdbctx, gdbctx->other_thread->handle, pctx = &ctx))
return packet_error;
}
cpu_register_hex_from(gdbctx, pctx, reg, (const char**)&ptr);
if (pctx != &gdbctx->context &&
!gdbctx->process->be_cpu->set_context(gdbctx->other_thread->handle, pctx))
{
ERR("Failed to set context for tid %04x, error %u\n",
gdbctx->other_thread->tid, GetLastError());
return packet_error;
}
return packet_ok;
}
static void packet_query_monitor_wnd_helper(struct gdb_context* gdbctx, HWND hWnd, int indent)
{
char buffer[128];
char clsName[128];
char wndName[128];
HWND child;
do {
if (!GetClassNameA(hWnd, clsName, sizeof(clsName)))
strcpy(clsName, "-- Unknown --");
if (!GetWindowTextA(hWnd, wndName, sizeof(wndName)))
strcpy(wndName, "-- Empty --");
packet_reply_open(gdbctx);
packet_reply_catc(gdbctx, 'O');
snprintf(buffer, sizeof(buffer),
"%*s%04lx%*s%-17.17s %08x %0*lx %.14s\n",
indent, "", (ULONG_PTR)hWnd, 13 - indent, "",
clsName, GetWindowLongW(hWnd, GWL_STYLE),
ADDRWIDTH, (ULONG_PTR)GetWindowLongPtrW(hWnd, GWLP_WNDPROC),
wndName);
packet_reply_hex_to_str(gdbctx, buffer);
packet_reply_close(gdbctx);
if ((child = GetWindow(hWnd, GW_CHILD)) != 0)
packet_query_monitor_wnd_helper(gdbctx, child, indent + 1);
} while ((hWnd = GetWindow(hWnd, GW_HWNDNEXT)) != 0);
}
static void packet_query_monitor_wnd(struct gdb_context* gdbctx, int len, const char* str)
{
char buffer[128];
/* we do the output in several 'O' packets, with the last one being just OK for
* marking the end of the output */
packet_reply_open(gdbctx);
packet_reply_catc(gdbctx, 'O');
snprintf(buffer, sizeof(buffer),
"%-16.16s %-17.17s %-8.8s %s\n",
"hwnd", "Class Name", " Style", " WndProc Text");
packet_reply_hex_to_str(gdbctx, buffer);
packet_reply_close(gdbctx);
/* FIXME: could also add a pmt to this command in str... */
packet_query_monitor_wnd_helper(gdbctx, GetDesktopWindow(), 0);
packet_reply(gdbctx, "OK", 2);
}
static void packet_query_monitor_process(struct gdb_context* gdbctx, int len, const char* str)
{
HANDLE snap = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
char buffer[31+MAX_PATH];
char deco;
PROCESSENTRY32 entry;
BOOL ok;
if (snap == INVALID_HANDLE_VALUE)
return;
entry.dwSize = sizeof(entry);
ok = Process32First(snap, &entry);
/* we do the output in several 'O' packets, with the last one being just OK for
* marking the end of the output */
packet_reply_open(gdbctx);
packet_reply_catc(gdbctx, 'O');
snprintf(buffer, sizeof(buffer),
" %-8.8s %-8.8s %-8.8s %s\n",
"pid", "threads", "parent", "executable");
packet_reply_hex_to_str(gdbctx, buffer);
packet_reply_close(gdbctx);
while (ok)
{
deco = ' ';
if (entry.th32ProcessID == gdbctx->process->pid) deco = '>';
packet_reply_open(gdbctx);
packet_reply_catc(gdbctx, 'O');
snprintf(buffer, sizeof(buffer),
"%c%08x %-8d %08x '%s'\n",
deco, entry.th32ProcessID, entry.cntThreads,
entry.th32ParentProcessID, entry.szExeFile);
packet_reply_hex_to_str(gdbctx, buffer);
packet_reply_close(gdbctx);
ok = Process32Next(snap, &entry);
}
CloseHandle(snap);
packet_reply(gdbctx, "OK", 2);
}
static void packet_query_monitor_mem(struct gdb_context* gdbctx, int len, const char* str)
{
MEMORY_BASIC_INFORMATION mbi;
char* addr = 0;
const char* state;
const char* type;
char prot[3+1];
char buffer[128];
/* we do the output in several 'O' packets, with the last one being just OK for
* marking the end of the output */
packet_reply_open(gdbctx);
packet_reply_catc(gdbctx, 'O');
packet_reply_hex_to_str(gdbctx, "Address Size State Type RWX\n");
packet_reply_close(gdbctx);
while (VirtualQueryEx(gdbctx->process->handle, addr, &mbi, sizeof(mbi)) >= sizeof(mbi))
{
switch (mbi.State)
{
case MEM_COMMIT: state = "commit "; break;
case MEM_FREE: state = "free "; break;
case MEM_RESERVE: state = "reserve"; break;
default: state = "??? "; break;
}
if (mbi.State != MEM_FREE)
{
switch (mbi.Type)
{
case MEM_IMAGE: type = "image "; break;
case MEM_MAPPED: type = "mapped "; break;
case MEM_PRIVATE: type = "private"; break;
case 0: type = " "; break;
default: type = "??? "; break;
}
memset(prot, ' ' , sizeof(prot)-1);
prot[sizeof(prot)-1] = '\0';
if (mbi.AllocationProtect & (PAGE_READONLY|PAGE_READWRITE|PAGE_EXECUTE_READ|PAGE_EXECUTE_READWRITE))
prot[0] = 'R';
if (mbi.AllocationProtect & (PAGE_READWRITE|PAGE_EXECUTE_READWRITE))
prot[1] = 'W';
if (mbi.AllocationProtect & (PAGE_WRITECOPY|PAGE_EXECUTE_WRITECOPY))
prot[1] = 'C';
if (mbi.AllocationProtect & (PAGE_EXECUTE|PAGE_EXECUTE_READ|PAGE_EXECUTE_READWRITE))
prot[2] = 'X';
}
else
{
type = "";
prot[0] = '\0';
}
packet_reply_open(gdbctx);
snprintf(buffer, sizeof(buffer), "%0*lx %0*lx %s %s %s\n",
(unsigned)sizeof(void*), (DWORD_PTR)addr,
(unsigned)sizeof(void*), mbi.RegionSize, state, type, prot);
packet_reply_catc(gdbctx, 'O');
packet_reply_hex_to_str(gdbctx, buffer);
packet_reply_close(gdbctx);
if (addr + mbi.RegionSize < addr) /* wrap around ? */
break;
addr += mbi.RegionSize;
}
packet_reply(gdbctx, "OK", 2);
}
struct query_detail
{
int with_arg;
const char* name;
size_t len;
void (*handler)(struct gdb_context*, int, const char*);
} query_details[] =
{
{0, "wnd", 3, packet_query_monitor_wnd},
{0, "window", 6, packet_query_monitor_wnd},
{0, "proc", 4, packet_query_monitor_process},
{0, "process", 7, packet_query_monitor_process},
{0, "mem", 3, packet_query_monitor_mem},
{0, NULL, 0, NULL},
};
static enum packet_return packet_query_remote_command(struct gdb_context* gdbctx,
const char* hxcmd, size_t len)
{
char buffer[128];
struct query_detail* qd;
assert((len & 1) == 0 && len < 2 * sizeof(buffer));
len /= 2;
hex_from(buffer, hxcmd, len);
for (qd = query_details; qd->name != NULL; qd++)
{
if (len < qd->len || strncmp(buffer, qd->name, qd->len) != 0) continue;
if (!qd->with_arg && len != qd->len) continue;
(qd->handler)(gdbctx, len - qd->len, buffer + qd->len);
return packet_done;
}
return packet_reply_error(gdbctx, EINVAL);
}
static enum packet_return packet_query(struct gdb_context* gdbctx)
{
switch (gdbctx->in_packet[0])
{
case 'f':
if (strncmp(gdbctx->in_packet + 1, "ThreadInfo", gdbctx->in_packet_len - 1) == 0)
{
struct dbg_thread* thd;
packet_reply_open(gdbctx);
packet_reply_add(gdbctx, "m", 1);
LIST_FOR_EACH_ENTRY(thd, &gdbctx->process->threads, struct dbg_thread, entry)
{
packet_reply_val(gdbctx, thd->tid, 4);
if (list_next(&gdbctx->process->threads, &thd->entry) != NULL)
packet_reply_add(gdbctx, ",", 1);
}
packet_reply_close(gdbctx);
return packet_done;
}
else if (strncmp(gdbctx->in_packet + 1, "ProcessInfo", gdbctx->in_packet_len - 1) == 0)
{
char result[128];
packet_reply_open(gdbctx);
packet_reply_catc(gdbctx, 'O');
get_process_info(gdbctx, result, sizeof(result));
packet_reply_hex_to_str(gdbctx, result);
packet_reply_close(gdbctx);
return packet_done;
}
break;
case 's':
if (strncmp(gdbctx->in_packet + 1, "ThreadInfo", gdbctx->in_packet_len - 1) == 0)
{
packet_reply(gdbctx, "l", 1);
return packet_done;
}
else if (strncmp(gdbctx->in_packet + 1, "ProcessInfo", gdbctx->in_packet_len - 1) == 0)
{
packet_reply(gdbctx, "l", 1);
return packet_done;
}
break;
case 'A':
if (strncmp(gdbctx->in_packet, "Attached", gdbctx->in_packet_len) == 0)
{
char buf[2];
buf[0] = '1';
buf[1] = 0;
return packet_reply(gdbctx, buf, -1);
}
break;
case 'C':
if (gdbctx->in_packet_len == 1)
{
struct dbg_thread* thd;
/* FIXME: doc says 16 bit val ??? */
/* grab first created thread, aka last in list */
assert(gdbctx->process && !list_empty(&gdbctx->process->threads));
thd = LIST_ENTRY(list_tail(&gdbctx->process->threads), struct dbg_thread, entry);
packet_reply_open(gdbctx);
packet_reply_add(gdbctx, "QC", 2);
packet_reply_val(gdbctx, thd->tid, 4);
packet_reply_close(gdbctx);
return packet_done;
}
break;
case 'O':
if (strncmp(gdbctx->in_packet, "Offsets", gdbctx->in_packet_len) == 0)
{
char buf[64];
snprintf(buf, sizeof(buf),
"Text=%08lx;Data=%08lx;Bss=%08lx",
gdbctx->wine_segs[0], gdbctx->wine_segs[1],
gdbctx->wine_segs[2]);
return packet_reply(gdbctx, buf, -1);
}
break;
case 'R':
if (gdbctx->in_packet_len > 5 && strncmp(gdbctx->in_packet, "Rcmd,", 5) == 0)
{
return packet_query_remote_command(gdbctx, gdbctx->in_packet + 5,
gdbctx->in_packet_len - 5);
}
break;
case 'S':
if (strncmp(gdbctx->in_packet, "Symbol::", gdbctx->in_packet_len) == 0)
return packet_ok;
if (strncmp(gdbctx->in_packet, "Supported", 9) == 0)
{
if (strlen(target_xml))
return packet_reply(gdbctx, "PacketSize=400;qXfer:features:read+", -1);
else
{
/* no features supported */
packet_reply_open(gdbctx);
packet_reply_close(gdbctx);
return packet_done;
}
}
break;
case 'T':
if (gdbctx->in_packet_len > 15 &&
strncmp(gdbctx->in_packet, "ThreadExtraInfo", 15) == 0 &&
gdbctx->in_packet[15] == ',')
{
unsigned tid;
char* end;
char result[128];
tid = strtol(gdbctx->in_packet + 16, &end, 16);
if (end == NULL) break;
get_thread_info(gdbctx, tid, result, sizeof(result));
packet_reply_open(gdbctx);
packet_reply_hex_to_str(gdbctx, result);
packet_reply_close(gdbctx);
return packet_done;
}
if (strncmp(gdbctx->in_packet, "TStatus", 7) == 0)
{
/* Tracepoints not supported */
packet_reply_open(gdbctx);
packet_reply_close(gdbctx);
return packet_done;
}
break;
case 'X':
if (strlen(target_xml) && strncmp(gdbctx->in_packet, "Xfer:features:read:target.xml", 29) == 0)
return packet_reply(gdbctx, target_xml, -1);
break;
}
ERR("Unhandled query %s\n", debugstr_an(gdbctx->in_packet, gdbctx->in_packet_len));
return packet_error;
}
static enum packet_return packet_step(struct gdb_context* gdbctx)
{
/* FIXME: add support for address in packet */
assert(gdbctx->in_packet_len == 0);
if (dbg_curr_thread != gdbctx->exec_thread && gdbctx->exec_thread)
FIXME("Can't single-step thread %04x while on thread %04x\n",
gdbctx->exec_thread->tid, dbg_curr_thread->tid);
gdbctx->process->be_cpu->single_step(&gdbctx->context, TRUE);
resume_debuggee(gdbctx, DBG_CONTINUE);
wait_for_debuggee(gdbctx);
gdbctx->process->be_cpu->single_step(&gdbctx->context, FALSE);
return packet_reply_status(gdbctx);
}
#if 0
static enum packet_return packet_step_signal(struct gdb_context* gdbctx)
{
unsigned char sig;
/* FIXME: add support for address in packet */
assert(gdbctx->in_packet_len == 2);
if (dbg_curr_thread->tid != gdbctx->exec_thread && gdbctx->exec_thread)
if (gdbctx->trace & GDBPXY_TRC_COMMAND_ERROR)
fprintf(stderr, "NIY: step/sig on %u, while last thread is %u\n",
gdbctx->exec_thread, DEBUG_CurrThread->tid);
hex_from(&sig, gdbctx->in_packet, 1);
/* cannot change signals on the fly */
if (gdbctx->trace & GDBPXY_TRC_COMMAND)
fprintf(stderr, "sigs: %u %u\n", sig, gdbctx->last_sig);
if (sig != gdbctx->last_sig)
return packet_error;
resume_debuggee(gdbctx, DBG_EXCEPTION_NOT_HANDLED);
wait_for_debuggee(gdbctx);
return packet_reply_status(gdbctx);
}
#endif
static enum packet_return packet_thread_alive(struct gdb_context* gdbctx)
{
char* end;
unsigned tid;
tid = strtol(gdbctx->in_packet, &end, 16);
if (tid == -1 || tid == 0)
return packet_reply_error(gdbctx, EINVAL);
if (dbg_get_thread(gdbctx->process, tid) != NULL)
return packet_ok;
return packet_reply_error(gdbctx, ESRCH);
}
/* =============================================== *
* P A C K E T I N F R A S T R U C T U R E *
* =============================================== *
*/
struct packet_entry
{
char key;
enum packet_return (*handler)(struct gdb_context* gdbctx);
};
static struct packet_entry packet_entries[] =
{
/*{'!', packet_extended}, */
{'?', packet_last_signal},
{'c', packet_continue},
{'C', packet_continue_signal},
{'D', packet_detach},
{'g', packet_read_registers},
{'G', packet_write_registers},
{'k', packet_kill},
{'H', packet_thread},
{'m', packet_read_memory},
{'M', packet_write_memory},
{'p', packet_read_register},
{'P', packet_write_register},
{'q', packet_query},
/* {'Q', packet_set}, */
/* {'R', packet,restart}, only in extended mode ! */
{'s', packet_step},
/*{'S', packet_step_signal}, hard(er) to implement */
{'T', packet_thread_alive},
{'v', packet_verbose},
};
static BOOL extract_packets(struct gdb_context* gdbctx)
{
char* end;
int plen;
unsigned char in_cksum, loc_cksum;
char* ptr;
enum packet_return ret = packet_error;
int num_packet = 0;
while ((ret & packet_last_f) == 0)
{
TRACE("Packet: %s\n", debugstr_an(gdbctx->in_buf, gdbctx->in_len));
ptr = memchr(gdbctx->in_buf, '$', gdbctx->in_len);
if (ptr == NULL) return FALSE;
if (ptr != gdbctx->in_buf)
{
int glen = ptr - gdbctx->in_buf; /* garbage len */
WARN("Removing garbage: %s\n", debugstr_an(gdbctx->in_buf, glen));
gdbctx->in_len -= glen;
memmove(gdbctx->in_buf, ptr, gdbctx->in_len);
}
end = memchr(gdbctx->in_buf + 1, '#', gdbctx->in_len);
if (end == NULL) return FALSE;
/* no checksum yet */
if (end + 3 > gdbctx->in_buf + gdbctx->in_len) return FALSE;
plen = end - gdbctx->in_buf - 1;
hex_from(&in_cksum, end + 1, 1);
loc_cksum = checksum(gdbctx->in_buf + 1, plen);
if (loc_cksum == in_cksum)
{
if (num_packet == 0) {
int i;
ret = packet_error;
write(gdbctx->sock, "+", 1);
assert(plen);
/* FIXME: should use bsearch if packet_entries was sorted */
for (i = 0; i < ARRAY_SIZE(packet_entries); i++)
{
if (packet_entries[i].key == gdbctx->in_buf[1]) break;
}
if (i == ARRAY_SIZE(packet_entries))
WARN("Unhandled packet %s\n", debugstr_an(&gdbctx->in_buf[1], plen));
else
{
gdbctx->in_packet = gdbctx->in_buf + 2;
gdbctx->in_packet_len = plen - 1;
ret = (packet_entries[i].handler)(gdbctx);
}
switch (ret & ~packet_last_f)
{
case packet_error: packet_reply(gdbctx, "", 0); break;
case packet_ok: packet_reply(gdbctx, "OK", 2); break;
case packet_done: break;
}
TRACE("Reply: %s\n", debugstr_an(gdbctx->out_buf, gdbctx->out_len));
i = write(gdbctx->sock, gdbctx->out_buf, gdbctx->out_len);
assert(i == gdbctx->out_len);
/* if this fails, we'll have to use POLLOUT...
*/
gdbctx->out_len = 0;
num_packet++;
}
else
{
/* FIXME: If we have more than one packet in our input buffer,
* it's very likely that we took too long to answer to a given packet
* and gdb is sending us the same packet again.
* So we simply drop the second packet. This will lower the risk of error,
* but there are still some race conditions here.
* A better fix (yet not perfect) would be to have two threads:
* - one managing the packets for gdb
* - the second one managing the commands...
* This would allow us to send the reply with the '+' character (Ack of
* the command) way sooner than we do now.
*/
ERR("Dropping packet; I was too slow to respond\n");
}
}
else
{
write(gdbctx->sock, "+", 1);
ERR("Dropping packet; invalid checksum %d <> %d\n", in_cksum, loc_cksum);
}
gdbctx->in_len -= plen + 4;
memmove(gdbctx->in_buf, end + 3, gdbctx->in_len);
}
return TRUE;
}
static int fetch_data(struct gdb_context* gdbctx)
{
int len, in_len = gdbctx->in_len;
assert(gdbctx->in_len <= gdbctx->in_buf_alloc);
for (;;)
{
#define STEP 128
if (gdbctx->in_len + STEP > gdbctx->in_buf_alloc)
gdbctx->in_buf = packet_realloc(gdbctx->in_buf, gdbctx->in_buf_alloc += STEP);
#undef STEP
len = read(gdbctx->sock, gdbctx->in_buf + gdbctx->in_len, gdbctx->in_buf_alloc - gdbctx->in_len);
if (len <= 0) break;
gdbctx->in_len += len;
assert(gdbctx->in_len <= gdbctx->in_buf_alloc);
if (len < gdbctx->in_buf_alloc - gdbctx->in_len) break;
}
return gdbctx->in_len - in_len;
}
#define FLAG_NO_START 1
#define FLAG_WITH_XTERM 2
static BOOL gdb_exec(const char* wine_path, unsigned port, unsigned flags)
{
char buf[MAX_PATH];
int fd;
const char *gdb_path, *tmp_path;
FILE* f;
if (!(gdb_path = getenv("WINE_GDB"))) gdb_path = "gdb";
if (!(tmp_path = getenv("TMPDIR"))) tmp_path = "/tmp";
strcpy(buf, tmp_path);
strcat(buf, "/winegdb.XXXXXX");
fd = mkstemps(buf, 0);
if (fd == -1) return FALSE;
if ((f = fdopen(fd, "w+")) == NULL) return FALSE;
fprintf(f, "file %s\n", wine_path);
fprintf(f, "target remote localhost:%d\n", ntohs(port));
fprintf(f, "set prompt Wine-gdb>\\ \n");
/* gdb 5.1 seems to require it, won't hurt anyway */
fprintf(f, "sharedlibrary\n");
/* This is needed (but not a decent & final fix)
* Without this, gdb would skip our inter-DLL relay code (because
* we don't have any line number information for the relay code)
* With this, we will stop on first instruction of the stub, and
* reusing step, will get us through the relay stub at the actual
* function we're looking at.
*/
fprintf(f, "set step-mode on\n");
/* tell gdb to delete this file when done handling it... */
fprintf(f, "shell rm -f \"%s\"\n", buf);
fclose(f);
if (flags & FLAG_WITH_XTERM)
execlp("xterm", "xterm", "-e", gdb_path, "-x", buf, NULL);
else
execlp(gdb_path, gdb_path, "-x", buf, NULL);
assert(0); /* never reached */
return TRUE;
}
static BOOL gdb_startup(struct gdb_context* gdbctx, DEBUG_EVENT* de, unsigned flags, unsigned port)
{
int sock;
struct sockaddr_in s_addrs = {0};
socklen_t s_len = sizeof(s_addrs);
struct pollfd pollfd;
IMAGEHLP_MODULE64 imh_mod;
BOOL ret = FALSE;
/* step 1: create socket for gdb connection request */
if ((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1)
{
ERR("Failed to create socket: %s\n", strerror(errno));
return FALSE;
}
s_addrs.sin_family = AF_INET;
s_addrs.sin_addr.s_addr = INADDR_ANY;
s_addrs.sin_port = htons(port);
if (bind(sock, (struct sockaddr *)&s_addrs, sizeof(s_addrs)) == -1)
goto cleanup;
if (listen(sock, 1) == -1 || getsockname(sock, (struct sockaddr*)&s_addrs, &s_len) == -1)
goto cleanup;
/* step 2: do the process internal creation */
handle_debug_event(gdbctx, de);
/* step3: get the wine loader name */
if (!dbg_get_debuggee_info(gdbctx->process->handle, &imh_mod))
goto cleanup;
/* step 4: fire up gdb (if requested) */
if (flags & FLAG_NO_START)
fprintf(stderr, "target remote localhost:%d\n", ntohs(s_addrs.sin_port));
else
switch (fork())
{
case -1: /* error in parent... */
ERR("Failed to start gdb: fork: %s\n", strerror(errno));
goto cleanup;
default: /* in parent... success */
signal(SIGINT, SIG_IGN);
break;
case 0: /* in child... and alive */
gdb_exec(imh_mod.LoadedImageName, s_addrs.sin_port, flags);
/* if we're here, exec failed, so report failure */
goto cleanup;
}
/* step 5: wait for gdb to connect actually */
pollfd.fd = sock;
pollfd.events = POLLIN;
pollfd.revents = 0;
switch (poll(&pollfd, 1, -1))
{
case 1:
if (pollfd.revents & POLLIN)
{
int dummy = 1;
gdbctx->sock = accept(sock, (struct sockaddr*)&s_addrs, &s_len);
if (gdbctx->sock == -1)
break;
ret = TRUE;
TRACE("connected on %d\n", gdbctx->sock);
/* don't keep our small packets too long: send them ASAP back to GDB
* without this, GDB really crawls
*/
setsockopt(gdbctx->sock, IPPROTO_TCP, TCP_NODELAY, (char*)&dummy, sizeof(dummy));
}
break;
case 0:
ERR("Timed out connecting to gdb\n");
break;
case -1:
ERR("Failed to connect to gdb: poll: %s\n", strerror(errno));
break;
default:
assert(0);
}
cleanup:
close(sock);
return ret;
}
static BOOL gdb_init_context(struct gdb_context* gdbctx, unsigned flags, unsigned port)
{
DEBUG_EVENT de;
int i;
gdbctx->sock = -1;
gdbctx->in_buf = NULL;
gdbctx->in_buf_alloc = 0;
gdbctx->in_len = 0;
gdbctx->out_buf = NULL;
gdbctx->out_buf_alloc = 0;
gdbctx->out_len = 0;
gdbctx->out_curr_packet = -1;
gdbctx->exec_thread = gdbctx->other_thread = NULL;
gdbctx->last_sig = 0;
gdbctx->in_trap = FALSE;
gdbctx->process = NULL;
for (i = 0; i < ARRAY_SIZE(gdbctx->wine_segs); i++)
gdbctx->wine_segs[i] = 0;
/* wait for first trap */
while (WaitForDebugEvent(&de, INFINITE))
{
if (de.dwDebugEventCode == CREATE_PROCESS_DEBUG_EVENT)
{
/* this should be the first event we get,
* and the only one of this type */
assert(gdbctx->process == NULL && de.dwProcessId == dbg_curr_pid);
/* gdbctx->dwProcessId = pid; */
if (!gdb_startup(gdbctx, &de, flags, port)) return FALSE;
assert(!gdbctx->in_trap);
}
else
{
handle_debug_event(gdbctx, &de);
if (gdbctx->in_trap) break;
}
ContinueDebugEvent(de.dwProcessId, de.dwThreadId, DBG_CONTINUE);
}
return TRUE;
}
static int gdb_remote(unsigned flags, unsigned port)
{
struct pollfd pollfd;
struct gdb_context gdbctx;
BOOL doLoop;
for (doLoop = gdb_init_context(&gdbctx, flags, port); doLoop;)
{
pollfd.fd = gdbctx.sock;
pollfd.events = POLLIN;
pollfd.revents = 0;
switch (poll(&pollfd, 1, -1))
{
case 1:
/* got something */
if (pollfd.revents & (POLLHUP | POLLERR))
{
ERR("gdb hung up\n");
/* kill also debuggee process - questionnable - */
detach_debuggee(&gdbctx, TRUE);
doLoop = FALSE;
break;
}
if ((pollfd.revents & POLLIN) && fetch_data(&gdbctx) > 0)
{
if (extract_packets(&gdbctx)) doLoop = FALSE;
}
break;
case 0:
/* timeout, should never happen (infinite timeout) */
break;
case -1:
ERR("poll failed: %s\n", strerror(errno));
doLoop = FALSE;
break;
}
}
wait(NULL);
return 0;
}
#endif
int gdb_main(int argc, char* argv[])
{
#ifdef HAVE_POLL
unsigned gdb_flags = 0, port = 0;
char *port_end;
argc--; argv++;
while (argc > 0 && argv[0][0] == '-')
{
if (strcmp(argv[0], "--no-start") == 0)
{
gdb_flags |= FLAG_NO_START;
argc--; argv++;
continue;
}
if (strcmp(argv[0], "--with-xterm") == 0)
{
gdb_flags |= FLAG_WITH_XTERM;
argc--; argv++;
continue;
}
if (strcmp(argv[0], "--port") == 0 && argc > 1)
{
port = strtoul(argv[1], &port_end, 10);
if (*port_end)
{
fprintf(stderr, "Invalid port: %s\n", argv[1]);
return -1;
}
argc -= 2; argv += 2;
continue;
}
return -1;
}
if (dbg_active_attach(argc, argv) == start_ok ||
dbg_active_launch(argc, argv) == start_ok)
return gdb_remote(gdb_flags, port);
#else
fprintf(stderr, "GdbProxy mode not supported on this platform\n");
#endif
return -1;
}
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