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Sweden-Number/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. If len <= 0, a default length is used.
*/
void stack_info(int len)
{
struct dbg_lvalue lvalue;
if(len <= 0)
len = 24;
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 or 64-bit mode */
memory_examine(&lvalue, len, 'a');
break;
case AddrMode1632: /* 32-bit mode */
memory_examine(&lvalue, len, 'x');
break;
case AddrModeReal: /* 16-bit mode */
case AddrMode1616:
memory_examine(&lvalue, len, '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 = dbg_curr_thread->frames[nf].linear_pc;
/* if we're not the first frame, InstructionOffset is the return address
* after the call instruction (at least on most processors I know of).
* However, there are cases where this address is outside of the current function.
* This happens when the called function is marked <NO RETURN>, in which
* case the compiler can omit the epilog (gcc 4 does it)
* Therefore, we decrement InstructionOffset in order to ensure that
* the considered address is really inside the current function.
*/
if (nf) ihsf->InstructionOffset--;
ihsf->FrameOffset = dbg_curr_thread->frames[nf].linear_frame;
ihsf->StackOffset = dbg_curr_thread->frames[nf].linear_stack;
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_get_register_current_frame(unsigned regno, DWORD_PTR** pval)
{
enum be_cpu_addr kind;
if (dbg_curr_thread->frames == NULL) return FALSE;
if (!be_cpu->get_register_info(regno, &kind)) return FALSE;
switch (kind)
{
case be_cpu_addr_pc:
*pval = &dbg_curr_thread->frames[dbg_curr_thread->curr_frame].linear_pc;
break;
case be_cpu_addr_stack:
*pval = &dbg_curr_thread->frames[dbg_curr_thread->curr_frame].linear_stack;
break;
case be_cpu_addr_frame:
*pval = &dbg_curr_thread->frames[dbg_curr_thread->curr_frame].linear_frame;
break;
}
return TRUE;
}
BOOL stack_get_register_frame(const struct dbg_internal_var* div, DWORD_PTR** pval)
{
if (dbg_curr_thread->frames == NULL) return FALSE;
if (dbg_curr_thread->frames[dbg_curr_thread->curr_frame].is_ctx_valid)
*pval = (DWORD_PTR*)((char*)&dbg_curr_thread->frames[dbg_curr_thread->curr_frame].context +
(DWORD_PTR)div->pval);
else
{
enum be_cpu_addr kind;
if (!be_cpu->get_register_info(div->val, &kind)) return FALSE;
/* reuse some known registers directly out of stackwalk details */
switch (kind)
{
case be_cpu_addr_pc:
*pval = &dbg_curr_thread->frames[dbg_curr_thread->curr_frame].linear_pc;
break;
case be_cpu_addr_stack:
*pval = &dbg_curr_thread->frames[dbg_curr_thread->curr_frame].linear_stack;
break;
case be_cpu_addr_frame:
*pval = &dbg_curr_thread->frames[dbg_curr_thread->curr_frame].linear_frame;
break;
}
}
return TRUE;
}
BOOL stack_set_frame(int newframe)
{
ADDRESS64 addr;
if (!stack_set_frame_internal(newframe)) return FALSE;
addr.Mode = AddrModeFlat;
addr.Offset = (DWORD_PTR)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 current thread
*/
unsigned stack_fetch_frames(const CONTEXT* _ctx)
{
STACKFRAME64 sf;
unsigned nf = 0;
/* as native stackwalk can modify the context passed to it, simply copy
* it to avoid any damage
*/
CONTEXT ctx = *_ctx;
HeapFree(GetProcessHeap(), 0, dbg_curr_thread->frames);
dbg_curr_thread->frames = NULL;
memset(&sf, 0, sizeof(sf));
be_cpu->get_addr(dbg_curr_thread->handle, &ctx, be_cpu_addr_frame, &sf.AddrFrame);
be_cpu->get_addr(dbg_curr_thread->handle, &ctx, be_cpu_addr_pc, &sf.AddrPC);
be_cpu->get_addr(dbg_curr_thread->handle, &ctx, be_cpu_addr_stack, &sf.AddrStack);
/* don't confuse StackWalk by passing in inconsistent addresses */
if ((sf.AddrPC.Mode == AddrModeFlat) && (sf.AddrFrame.Mode != AddrModeFlat))
{
sf.AddrFrame.Offset = (ULONG_PTR)memory_to_linear_addr(&sf.AddrFrame);
sf.AddrFrame.Mode = AddrModeFlat;
}
while (StackWalk64(be_cpu->machine, 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].linear_pc = (DWORD_PTR)memory_to_linear_addr(&sf.AddrPC);
dbg_curr_thread->frames[nf].addr_frame = sf.AddrFrame;
dbg_curr_thread->frames[nf].linear_frame = (DWORD_PTR)memory_to_linear_addr(&sf.AddrFrame);
dbg_curr_thread->frames[nf].addr_stack = sf.AddrStack;
dbg_curr_thread->frames[nf].linear_stack = (DWORD_PTR)memory_to_linear_addr(&sf.AddrStack);
dbg_curr_thread->frames[nf].context = ctx;
/* FIXME: can this heuristic be improved: we declare first context always valid, and next ones
* if it has been modified by the call to StackWalk...
*/
dbg_curr_thread->frames[nf].is_ctx_valid =
(nf == 0 ||
(dbg_curr_thread->frames[nf - 1].is_ctx_valid &&
memcmp(&dbg_curr_thread->frames[nf - 1].context, &ctx, sizeof(ctx))));
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
{
DWORD_PTR frame;
BOOL first;
};
static BOOL WINAPI sym_enum_cb(PSYMBOL_INFO sym_info, ULONG size, PVOID user)
{
struct sym_enum* se = user;
if (sym_info->Flags & SYMFLAG_PARAMETER)
{
if (!se->first) dbg_printf(", "); else se->first = FALSE;
symbol_print_local(sym_info, se->frame, FALSE);
}
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_LINE64 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;
DWORD disp;
dbg_printf(" %s", si->Name);
if (disp64) dbg_printf("+0x%lx", (DWORD_PTR)disp64);
SymSetContext(dbg_curr_process->handle, &ihsf, NULL);
se.first = TRUE;
se.frame = ihsf.FrameOffset;
dbg_printf("(");
SymEnumSymbols(dbg_curr_process->handle, 0, NULL, sym_enum_cb, &se);
dbg_printf(")");
il.SizeOfStruct = sizeof(il);
if (SymGetLineFromAddr64(dbg_curr_process->handle,
ihsf.InstructionOffset, &disp, &il))
dbg_printf(" [%s:%u]", 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 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);
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 (%04x) in process (%04x)\n", tid, pcs->pid);
else
{
CONTEXT context;
dbg_curr_tid = dbg_curr_thread->tid;
memset(&context, 0, sizeof(context));
context.ContextFlags = CONTEXT_FULL;
if (SuspendThread(dbg_curr_thread->handle) != -1)
{
if (!GetThreadContext(dbg_curr_thread->handle, &context))
{
dbg_printf("Can't get context for thread %04x in current process\n",
tid);
}
else
{
stack_fetch_frames(&context);
backtrace();
}
ResumeThread(dbg_curr_thread->handle);
}
else dbg_printf("Can't suspend thread %04x in current process\n", tid);
}
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;
struct dbg_thread* thread = dbg_curr_thread;
CONTEXT ctx = dbg_context;
DWORD cpid = dbg_curr_pid;
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 &&
cpid != dbg_curr_pid)
dbg_curr_process->process_io->close_process(dbg_curr_process, FALSE);
if (entry.th32OwnerProcessID == cpid)
{
dbg_curr_process = process;
dbg_curr_pid = cpid;
}
else if (entry.th32OwnerProcessID != dbg_curr_pid)
{
if (!dbg_attach_debuggee(entry.th32OwnerProcessID, FALSE))
{
dbg_printf("\nwarning: could not attach to %04x\n",
entry.th32OwnerProcessID);
continue;
}
dbg_curr_pid = dbg_curr_process->pid;
dbg_active_wait_for_first_exception();
}
dbg_printf("\nBacktracing for thread %04x in process %04lx (%s):\n",
entry.th32ThreadID, dbg_curr_pid,
dbg_W2A(dbg_curr_process->imageName, -1));
backtrace_tid(dbg_curr_process, entry.th32ThreadID);
}
while (Thread32Next(snapshot, &entry));
if (dbg_curr_process && cpid != dbg_curr_pid)
dbg_curr_process->process_io->close_process(dbg_curr_process, FALSE);
}
CloseHandle(snapshot);
dbg_curr_process = process;
dbg_curr_pid = cpid;
dbg_curr_thread = thread;
dbg_curr_tid = thread ? thread->tid : 0;
dbg_context = ctx;
}
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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