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winedbg: Support qXfer:libraries:read request. 

For now gdb does not request it as it still believes it's running a
normal application. It will however, as soon as we advertise support for
qXfer:features:read request and reply with a custom register set.

This also introduces packet_reply_open_xfer / packet_reply_close_xfer
function to allow partial replies. It always allocate the full reply
for simplicity and then truncates to the requested offset and size.

Signed-off-by: Rémi Bernon <rbernon@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
feature/deterministic
Rémi Bernon 2020-04-03 15:35:45 +02:00 committed by Alexandre Julliard
parent 55ca155ab8
commit 1e815b372a
1 changed files with 139 additions and 0 deletions
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139
programs/winedbg/gdbproxy.c
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@ -767,6 +767,35 @@ static void packet_reply_close(struct gdb_context* gdbctx)
gdbctx->out_curr_packet = -1;
}
static void packet_reply_open_xfer(struct gdb_context* gdbctx)
{
packet_reply_open(gdbctx);
packet_reply_add(gdbctx, "m");
}
static void packet_reply_close_xfer(struct gdb_context* gdbctx, int off, int len)
{
int begin = gdbctx->out_curr_packet + 1;
int plen;
if (begin + off < gdbctx->out_len)
{
gdbctx->out_len -= off;
memmove(gdbctx->out_buf + begin, gdbctx->out_buf + begin + off, gdbctx->out_len);
}
else
{
gdbctx->out_buf[gdbctx->out_curr_packet] = 'l';
gdbctx->out_len = gdbctx->out_curr_packet + 1;
}
plen = gdbctx->out_len - begin;
if (len >= 0 && plen > len) gdbctx->out_len -= (plen - len);
else gdbctx->out_buf[gdbctx->out_curr_packet] = 'l';
packet_reply_close(gdbctx);
}
static enum packet_return packet_reply(struct gdb_context* gdbctx, const char* packet)
{
packet_reply_open(gdbctx);
@ -1396,8 +1425,107 @@ static enum packet_return packet_query_remote_command(struct gdb_context* gdbctx
return packet_reply_error(gdbctx, EINVAL);
}
static BOOL CALLBACK packet_query_libraries_cb(PCSTR mod_name, DWORD64 base, PVOID ctx)
{
struct gdb_context* gdbctx = ctx;
MEMORY_BASIC_INFORMATION mbi;
IMAGE_SECTION_HEADER *sec;
IMAGE_DOS_HEADER *dos = NULL;
IMAGE_NT_HEADERS *nth = NULL;
IMAGEHLP_MODULE64 mod;
SIZE_T size, i;
BOOL is_wow64;
char buffer[0x400];
mod.SizeOfStruct = sizeof(mod);
SymGetModuleInfo64(gdbctx->process->handle, base, &mod);
packet_reply_add(gdbctx, "<library name=\"");
if (strcmp(mod.LoadedImageName, "[vdso].so") == 0)
packet_reply_add(gdbctx, "linux-vdso.so.1");
else if (mod.LoadedImageName[0] == '/')
packet_reply_add(gdbctx, mod.LoadedImageName);
else
{
UNICODE_STRING nt_name;
ANSI_STRING ansi_name;
char *unix_path, *tmp;
RtlInitAnsiString(&ansi_name, mod.LoadedImageName);
RtlAnsiStringToUnicodeString(&nt_name, &ansi_name, TRUE);
if ((unix_path = wine_get_unix_file_name(nt_name.Buffer)))
{
if (IsWow64Process(gdbctx->process->handle, &is_wow64) &&
is_wow64 && (tmp = strstr(unix_path, "system32")))
memcpy(tmp, "syswow64", 8);
packet_reply_add(gdbctx, unix_path);
}
else
packet_reply_add(gdbctx, mod.LoadedImageName);
HeapFree(GetProcessHeap(), 0, unix_path);
RtlFreeUnicodeString(&nt_name);
}
packet_reply_add(gdbctx, "\">");
size = sizeof(buffer);
if (VirtualQueryEx(gdbctx->process->handle, (void *)(UINT_PTR)mod.BaseOfImage, &mbi, sizeof(mbi)) >= sizeof(mbi) &&
mbi.Type == MEM_IMAGE && mbi.State != MEM_FREE)
{
if (ReadProcessMemory(gdbctx->process->handle, (void *)(UINT_PTR)mod.BaseOfImage, buffer, size, &size) &&
size >= sizeof(IMAGE_DOS_HEADER))
dos = (IMAGE_DOS_HEADER *)buffer;
if (dos && dos->e_magic == IMAGE_DOS_SIGNATURE && dos->e_lfanew < size)
nth = (IMAGE_NT_HEADERS *)(buffer + dos->e_lfanew);
if (nth && memcmp(&nth->Signature, "PE\0\0", 4))
nth = NULL;
}
if (!nth) memset(buffer, 0, sizeof(buffer));
/* if the module is not PE we have cleared buffer with 0, this makes
* the following computation valid in all cases. */
dos = (IMAGE_DOS_HEADER *)buffer;
nth = (IMAGE_NT_HEADERS *)(buffer + dos->e_lfanew);
if (IsWow64Process(gdbctx->process->handle, &is_wow64) && is_wow64)
sec = IMAGE_FIRST_SECTION((IMAGE_NT_HEADERS32 *)nth);
else
sec = IMAGE_FIRST_SECTION((IMAGE_NT_HEADERS64 *)nth);
for (i = 0; i < max(nth->FileHeader.NumberOfSections, 1); ++i)
{
if ((char *)(sec + i) >= buffer + size) break;
packet_reply_add(gdbctx, "<segment address=\"0x");
packet_reply_val(gdbctx, mod.BaseOfImage + sec[i].VirtualAddress, sizeof(unsigned long));
packet_reply_add(gdbctx, "\"/>");
}
packet_reply_add(gdbctx, "</library>");
return TRUE;
}
static void packet_query_libraries(struct gdb_context* gdbctx)
{
BOOL opt;
/* this will resynchronize builtin dbghelp's internal ELF module list */
SymLoadModule(gdbctx->process->handle, 0, 0, 0, 0, 0);
packet_reply_add(gdbctx, "<library-list>");
opt = SymSetExtendedOption(SYMOPT_EX_WINE_NATIVE_MODULES, TRUE);
SymEnumerateModules64(gdbctx->process->handle, packet_query_libraries_cb, gdbctx);
SymSetExtendedOption(SYMOPT_EX_WINE_NATIVE_MODULES, opt);
packet_reply_add(gdbctx, "</library-list>");
}
static enum packet_return packet_query(struct gdb_context* gdbctx)
{
int off, len;
switch (gdbctx->in_packet[0])
{
case 'f':
@ -1485,6 +1613,7 @@ static enum packet_return packet_query(struct gdb_context* gdbctx)
{
packet_reply_open(gdbctx);
packet_reply_add(gdbctx, "QStartNoAckMode+;");
packet_reply_add(gdbctx, "qXfer:libraries:read+;");
if (*target_xml) packet_reply_add(gdbctx, "PacketSize=400;qXfer:features:read+");
packet_reply_close(gdbctx);
return packet_done;
@ -1516,6 +1645,16 @@ static enum packet_return packet_query(struct gdb_context* gdbctx)
}
break;
case 'X':
if (sscanf(gdbctx->in_packet, "Xfer:libraries:read::%x,%x", &off, &len) == 2)
{
if (!gdbctx->process) return packet_error;
packet_reply_open_xfer(gdbctx);
packet_query_libraries(gdbctx);
packet_reply_close_xfer(gdbctx, off, len);
return packet_done;
}
if (*target_xml && strncmp(gdbctx->in_packet, "Xfer:features:read:target.xml", 29) == 0)
return packet_reply(gdbctx, target_xml);
break;