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wine/programs/winedbg/stack.c

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/*
* Debugger stack handling
*
* Copyright 1995 Alexandre Julliard
* Copyright 1996 Eric Youngdale
* Copyright 1999 Ove Kåven
*
* 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
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include "debugger.h"
#include "winbase.h"
#include "wine/winbase16.h"
#include "tlhelp32.h"
/***********************************************************************
* stack_info
*
* Dump the top of the stack
*/
void stack_info(void)
{
struct dbg_lvalue lvalue;
lvalue.cookie = 0;
lvalue.type.id = dbg_itype_segptr;
lvalue.type.module = 0;
/* FIXME: we assume stack grows the same way as on i386 */
if (!memory_get_current_stack(&lvalue.addr))
dbg_printf("Bad segment (%d)\n", lvalue.addr.Segment);
dbg_printf("Stack dump:\n");
switch (lvalue.addr.Mode)
{
case AddrModeFlat: /* 32-bit mode */
case AddrMode1632: /* 32-bit mode */
memory_examine(&lvalue, 24, 'x');
break;
case AddrModeReal: /* 16-bit mode */
case AddrMode1616:
memory_examine(&lvalue, 24, 'w');
break;
}
}
static BOOL stack_set_frame_internal(int newframe)
{
if (newframe >= dbg_curr_thread->num_frames)
newframe = dbg_curr_thread->num_frames - 1;
if (newframe < 0)
newframe = 0;
if (dbg_curr_thread->curr_frame != newframe)
{
IMAGEHLP_STACK_FRAME ihsf;
dbg_curr_thread->curr_frame = newframe;
stack_get_current_frame(&ihsf);
SymSetContext(dbg_curr_process->handle, &ihsf, NULL);
}
return TRUE;
}
static BOOL stack_get_frame(int nf, IMAGEHLP_STACK_FRAME* ihsf)
{
memset(ihsf, 0, sizeof(*ihsf));
ihsf->InstructionOffset = (unsigned long)memory_to_linear_addr(&dbg_curr_thread->frames[nf].addr_pc);
ihsf->FrameOffset = (unsigned long)memory_to_linear_addr(&dbg_curr_thread->frames[nf].addr_frame);
return TRUE;
}
BOOL stack_get_current_frame(IMAGEHLP_STACK_FRAME* ihsf)
{
/*
* If we don't have a valid backtrace, then just return.
*/
if (dbg_curr_thread->frames == NULL) return FALSE;
return stack_get_frame(dbg_curr_thread->curr_frame, ihsf);
}
BOOL stack_set_frame(int newframe)
{
ADDRESS64 addr;
if (!stack_set_frame_internal(newframe)) return FALSE;
addr.Mode = AddrModeFlat;
addr.Offset = (unsigned long)memory_to_linear_addr(&dbg_curr_thread->frames[dbg_curr_thread->curr_frame].addr_pc);
source_list_from_addr(&addr, 0);
return TRUE;
}
/******************************************************************
* stack_get_current_symbol
*
* Retrieves the symbol information for the current frame element
*/
BOOL stack_get_current_symbol(SYMBOL_INFO* symbol)
{
IMAGEHLP_STACK_FRAME ihsf;
DWORD64 disp;
if (!stack_get_current_frame(&ihsf)) return FALSE;
return SymFromAddr(dbg_curr_process->handle, ihsf.InstructionOffset,
&disp, symbol);
}
static BOOL CALLBACK stack_read_mem(HANDLE hProc, DWORD64 addr,
PVOID buffer, DWORD size, PDWORD written)
{
SIZE_T sz;
BOOL ret;
struct dbg_process* pcs = dbg_get_process_h(hProc);
if (!pcs) return FALSE;
ret = pcs->process_io->read(hProc, (const void*)(DWORD_PTR)addr, buffer,
size, &sz);
if (written != NULL) *written = sz;
return ret;
}
/******************************************************************
* stack_fetch_frames
*
* Do a backtrace on the the current thread
*/
unsigned stack_fetch_frames(void)
{
STACKFRAME64 sf;
unsigned nf = 0;
/* as native stackwalk can modify the context passed to it, simply copy
* it to avoid any damage
*/
CONTEXT ctx = dbg_context;
HeapFree(GetProcessHeap(), 0, dbg_curr_thread->frames);
dbg_curr_thread->frames = NULL;
memset(&sf, 0, sizeof(sf));
memory_get_current_frame(&sf.AddrFrame);
memory_get_current_pc(&sf.AddrPC);
/* don't confuse StackWalk by passing in inconsistent addresses */
if ((sf.AddrPC.Mode == AddrModeFlat) && (sf.AddrFrame.Mode != AddrModeFlat))
{
sf.AddrFrame.Offset = (DWORD)memory_to_linear_addr(&sf.AddrFrame);
sf.AddrFrame.Mode = AddrModeFlat;
}
while (StackWalk64(IMAGE_FILE_MACHINE_I386, dbg_curr_process->handle,
dbg_curr_thread->handle, &sf, &ctx, stack_read_mem,
SymFunctionTableAccess64, SymGetModuleBase64, NULL))
{
dbg_curr_thread->frames = dbg_heap_realloc(dbg_curr_thread->frames,
(nf + 1) * sizeof(dbg_curr_thread->frames[0]));
dbg_curr_thread->frames[nf].addr_pc = sf.AddrPC;
dbg_curr_thread->frames[nf].addr_frame = sf.AddrFrame;
nf++;
/* we've probably gotten ourselves into an infinite loop so bail */
if (nf > 200) break;
}
dbg_curr_thread->curr_frame = -1;
dbg_curr_thread->num_frames = nf;
stack_set_frame_internal(0);
return nf;
}
struct sym_enum
{
char* tmp;
DWORD frame;
};
static BOOL WINAPI sym_enum_cb(SYMBOL_INFO* sym_info, ULONG size, void* user)
{
struct sym_enum* se = (struct sym_enum*)user;
char tmp[32];
if (sym_info->Flags & SYMFLAG_PARAMETER)
{
if (se->tmp[0]) strcat(se->tmp, ", ");
if (sym_info->Flags & SYMFLAG_REGREL)
{
unsigned val;
DWORD addr = se->frame + sym_info->Address;
if (!dbg_read_memory((char*)addr, &val, sizeof(val)))
snprintf(tmp, sizeof(tmp), "<*** cannot read at 0x%lx ***>", addr);
else
snprintf(tmp, sizeof(tmp), "0x%x", val);
}
else if (sym_info->Flags & SYMFLAG_REGISTER)
{
DWORD* pval;
if (memory_get_register(sym_info->Register, &pval, tmp, sizeof(tmp)))
snprintf(tmp, sizeof(tmp), "0x%lx", *pval);
}
sprintf(se->tmp + strlen(se->tmp), "%s=%s", sym_info->Name, tmp);
}
return TRUE;
}
static void stack_print_addr_and_args(int nf)
{
char buffer[sizeof(SYMBOL_INFO) + 256];
SYMBOL_INFO* si = (SYMBOL_INFO*)buffer;
IMAGEHLP_STACK_FRAME ihsf;
IMAGEHLP_LINE il;
IMAGEHLP_MODULE im;
DWORD64 disp64;
print_bare_address(&dbg_curr_thread->frames[nf].addr_pc);
stack_get_frame(nf, &ihsf);
/* grab module where symbol is. If we don't have a module, we cannot print more */
im.SizeOfStruct = sizeof(im);
if (!SymGetModuleInfo(dbg_curr_process->handle, ihsf.InstructionOffset, &im))
return;
si->SizeOfStruct = sizeof(*si);
si->MaxNameLen = 256;
if (SymFromAddr(dbg_curr_process->handle, ihsf.InstructionOffset, &disp64, si))
{
struct sym_enum se;
char tmp[1024];
DWORD disp;
dbg_printf(" %s", si->Name);
if (disp64) dbg_printf("+0x%lx", (DWORD_PTR)disp64);
SymSetContext(dbg_curr_process->handle, &ihsf, NULL);
se.tmp = tmp;
se.frame = ihsf.FrameOffset;
tmp[0] = '\0';
SymEnumSymbols(dbg_curr_process->handle, 0, NULL, sym_enum_cb, &se);
if (tmp[0]) dbg_printf("(%s)", tmp);
il.SizeOfStruct = sizeof(il);
if (SymGetLineFromAddr(dbg_curr_process->handle, ihsf.InstructionOffset,
&disp, &il))
dbg_printf(" [%s:%lu]", il.FileName, il.LineNumber);
dbg_printf(" in %s", im.ModuleName);
}
else dbg_printf(" in %s (+0x%lx)",
im.ModuleName, (DWORD_PTR)(ihsf.InstructionOffset - im.BaseOfImage));
}
/******************************************************************
* backtrace
*
* Do a backtrace on the the current thread
*/
static void backtrace(void)
{
unsigned cf = dbg_curr_thread->curr_frame;
IMAGEHLP_STACK_FRAME ihsf;
dbg_printf("Backtrace:\n");
for (dbg_curr_thread->curr_frame = 0;
dbg_curr_thread->curr_frame < dbg_curr_thread->num_frames;
dbg_curr_thread->curr_frame++)
{
dbg_printf("%s%d ",
(cf == dbg_curr_thread->curr_frame ? "=>" : " "),
dbg_curr_thread->curr_frame + 1);
stack_print_addr_and_args(dbg_curr_thread->curr_frame);
dbg_printf(" (");
print_bare_address(&dbg_curr_thread->frames[dbg_curr_thread->curr_frame].addr_frame);
dbg_printf(")\n");
}
/* reset context to current stack frame */
dbg_curr_thread->curr_frame = cf;
if (!dbg_curr_thread->frames) return;
stack_get_frame(dbg_curr_thread->curr_frame, &ihsf);
SymSetContext(dbg_curr_process->handle, &ihsf, NULL);
}
/******************************************************************
* backtrace_tid
*
* Do a backtrace on a thread from its process and its identifier
* (preserves current thread and context information)
*/
static void backtrace_tid(struct dbg_process* pcs, DWORD tid)
{
struct dbg_thread* thread = dbg_curr_thread;
if (!(dbg_curr_thread = dbg_get_thread(pcs, tid)))
dbg_printf("Unknown thread id (0x%lx) in process (0x%lx)\n", tid, pcs->pid);
else
{
CONTEXT saved_ctx = dbg_context;
dbg_curr_tid = dbg_curr_thread->tid;
memset(&dbg_context, 0, sizeof(dbg_context));
dbg_context.ContextFlags = CONTEXT_FULL;
if (SuspendThread(dbg_curr_thread->handle) != -1)
{
if (!GetThreadContext(dbg_curr_thread->handle, &dbg_context))
{
dbg_printf("Can't get context for thread 0x%lx in current process\n",
tid);
}
else
{
stack_fetch_frames();
backtrace();
}
ResumeThread(dbg_curr_thread->handle);
}
else dbg_printf("Can't suspend thread 0x%lx in current process\n", tid);
dbg_context = saved_ctx;
}
dbg_curr_thread = thread;
dbg_curr_tid = thread ? thread->tid : 0;
}
/******************************************************************
* backtrace_all
*
* Do a backtrace on every running thread in the system (except the debugger)
* (preserves current process information)
*/
static void backtrace_all(void)
{
struct dbg_process* process = dbg_curr_process;
THREADENTRY32 entry;
HANDLE snapshot = CreateToolhelp32Snapshot(TH32CS_SNAPTHREAD, 0);
if (snapshot == INVALID_HANDLE_VALUE)
{
dbg_printf("Unable to create toolhelp snapshot\n");
return;
}
entry.dwSize = sizeof(entry);
if (Thread32First(snapshot, &entry))
{
do
{
if (entry.th32OwnerProcessID == GetCurrentProcessId()) continue;
if (dbg_curr_process && dbg_curr_pid != entry.th32OwnerProcessID)
dbg_curr_process->process_io->close_process(dbg_curr_process, FALSE);
if (entry.th32OwnerProcessID != dbg_curr_pid)
{
if (!dbg_attach_debuggee(entry.th32OwnerProcessID, FALSE))
{
dbg_printf("\nwarning: could not attach to 0x%lx\n",
entry.th32OwnerProcessID);
continue;
}
dbg_curr_pid = dbg_curr_process->pid;
dbg_active_wait_for_first_exception();
}
dbg_printf("\nBacktracing for thread 0x%lx in process 0x%lx (%s):\n",
entry.th32ThreadID, dbg_curr_pid, dbg_curr_process->imageName);
backtrace_tid(dbg_curr_process, entry.th32ThreadID);
}
while (Thread32Next(snapshot, &entry));
if (dbg_curr_process)
dbg_curr_process->process_io->close_process(dbg_curr_process, FALSE);
}
CloseHandle(snapshot);
dbg_curr_process = process;
dbg_curr_pid = process ? process->pid : 0;
}
void stack_backtrace(DWORD tid)
{
/* backtrace every thread in every process except the debugger itself,
* invoking via "bt all"
*/
if (tid == -1) return backtrace_all();
if (!dbg_curr_process)
{
dbg_printf("You must be attached to a process to run this command.\n");
return;
}
if (tid == dbg_curr_tid)
{
backtrace();
}
else
{
backtrace_tid(dbg_curr_process, tid);
}
}
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