454 lines
15 KiB
C
454 lines
15 KiB
C
/*
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* Debugger stack handling
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*
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* Copyright 1995 Alexandre Julliard
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* Copyright 1996 Eric Youngdale
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* Copyright 1999 Ove Kåven
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include "debugger.h"
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#include "winbase.h"
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#include "wine/winbase16.h"
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#include "tlhelp32.h"
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/***********************************************************************
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* stack_info
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*
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* Dump the top of the stack. If len <= 0, a default length is used.
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*/
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void stack_info(int len)
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{
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struct dbg_lvalue lvalue;
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if(len <= 0)
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len = 24;
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init_lvalue(&lvalue, TRUE, 0);
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lvalue.type.id = dbg_itype_segptr;
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/* FIXME: we assume stack grows the same way as on i386 */
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if (!memory_get_current_stack(&lvalue.addr))
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dbg_printf("Bad segment (%d)\n", lvalue.addr.Segment);
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dbg_printf("Stack dump:\n");
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switch (lvalue.addr.Mode)
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{
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case AddrModeFlat: /* 32-bit or 64-bit mode */
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memory_examine(&lvalue, len, 'a');
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break;
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case AddrMode1632: /* 32-bit mode */
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memory_examine(&lvalue, len, 'x');
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break;
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case AddrModeReal: /* 16-bit mode */
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case AddrMode1616:
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memory_examine(&lvalue, len, 'w');
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break;
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}
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}
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static BOOL stack_set_local_scope(void)
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{
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struct dbg_frame* frm = stack_get_thread_frame(dbg_curr_thread, dbg_curr_thread->curr_frame);
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if (!frm) return FALSE;
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/* if we're not the first frame, linear_pc is the return address
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* after the call instruction (at least on most processors I know of).
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* However, there are cases where this address is outside of the
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* current function or inline site.
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* This happens when the called function is marked <NO RETURN>, in which
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* case the compiler can omit the epilog (gcc 4 does it).
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* This happens also for inline sites, where the epilog (of the inline
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* site) isn't present.
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* Therefore, we decrement linear_pc in order to ensure that
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* the considered address is really inside the current function or inline site.
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*/
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return SymSetScopeFromInlineContext(dbg_curr_process->handle,
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(dbg_curr_thread->curr_frame) ? frm->linear_pc - 1 : frm->linear_pc,
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frm->inline_ctx);
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}
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static BOOL stack_set_frame_internal(int newframe)
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{
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if (newframe >= dbg_curr_thread->num_frames)
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newframe = dbg_curr_thread->num_frames - 1;
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if (newframe < 0)
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newframe = 0;
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if (dbg_curr_thread->curr_frame != newframe)
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{
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dbg_curr_thread->curr_frame = newframe;
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stack_set_local_scope();
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}
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return TRUE;
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}
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BOOL stack_get_register_frame(const struct dbg_internal_var* div, struct dbg_lvalue* lvalue)
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{
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struct dbg_frame* currfrm = stack_get_curr_frame();
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if (currfrm == NULL) return FALSE;
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if (currfrm->is_ctx_valid)
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init_lvalue_in_debugger(lvalue, div->typeid,
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(char*)&currfrm->context + (DWORD_PTR)div->pval);
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else
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{
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enum be_cpu_addr kind;
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if (!dbg_curr_process->be_cpu->get_register_info(div->val, &kind)) return FALSE;
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/* reuse some known registers directly out of stackwalk details */
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switch (kind)
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{
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case be_cpu_addr_pc:
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init_lvalue_in_debugger(lvalue, dbg_itype_unsigned_long_int, &currfrm->linear_pc);
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break;
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case be_cpu_addr_stack:
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init_lvalue_in_debugger(lvalue, dbg_itype_unsigned_long_int, &currfrm->linear_stack);
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break;
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case be_cpu_addr_frame:
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init_lvalue_in_debugger(lvalue, dbg_itype_unsigned_long_int, &currfrm->linear_frame);
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break;
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}
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}
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return TRUE;
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}
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BOOL stack_set_frame(int newframe)
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{
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ADDRESS64 addr;
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if (!stack_set_frame_internal(newframe)) return FALSE;
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addr.Mode = AddrModeFlat;
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addr.Offset = (DWORD_PTR)memory_to_linear_addr(&stack_get_curr_frame()->addr_pc);
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source_list_from_addr(&addr, 0);
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return TRUE;
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}
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/******************************************************************
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* stack_get_current_symbol
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*
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* Retrieves the symbol information for the current frame element
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*/
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BOOL stack_get_current_symbol(SYMBOL_INFO* symbol)
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{
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DWORD64 disp;
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struct dbg_frame* frm = stack_get_curr_frame();
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if (frm == NULL) return FALSE;
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return SymFromInlineContext(dbg_curr_process->handle, frm->linear_pc, frm->inline_ctx, &disp, symbol);
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}
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static BOOL CALLBACK stack_read_mem(HANDLE hProc, DWORD64 addr,
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PVOID buffer, DWORD size, PDWORD written)
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{
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SIZE_T sz;
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BOOL ret;
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struct dbg_process* pcs = dbg_get_process_h(hProc);
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if (!pcs) return FALSE;
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ret = pcs->process_io->read(hProc, (const void*)(DWORD_PTR)addr, buffer,
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size, &sz);
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if (written != NULL) *written = sz;
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return ret;
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}
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/******************************************************************
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* stack_fetch_frames
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*
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* Do a backtrace on the current thread
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*/
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unsigned stack_fetch_frames(const dbg_ctx_t* _ctx)
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{
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STACKFRAME_EX sf;
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unsigned nf = 0;
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/* as native stackwalk can modify the context passed to it, simply copy
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* it to avoid any damage
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*/
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dbg_ctx_t ctx = *_ctx;
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BOOL ret;
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HeapFree(GetProcessHeap(), 0, dbg_curr_thread->frames);
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dbg_curr_thread->frames = NULL;
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memset(&sf, 0, sizeof(sf));
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sf.StackFrameSize = sizeof(sf);
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dbg_curr_process->be_cpu->get_addr(dbg_curr_thread->handle, &ctx, be_cpu_addr_frame, &sf.AddrFrame);
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dbg_curr_process->be_cpu->get_addr(dbg_curr_thread->handle, &ctx, be_cpu_addr_pc, &sf.AddrPC);
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dbg_curr_process->be_cpu->get_addr(dbg_curr_thread->handle, &ctx, be_cpu_addr_stack, &sf.AddrStack);
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sf.InlineFrameContext = INLINE_FRAME_CONTEXT_INIT;
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/* don't confuse StackWalk by passing in inconsistent addresses */
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if ((sf.AddrPC.Mode == AddrModeFlat) && (sf.AddrFrame.Mode != AddrModeFlat))
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{
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sf.AddrFrame.Offset = (ULONG_PTR)memory_to_linear_addr(&sf.AddrFrame);
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sf.AddrFrame.Mode = AddrModeFlat;
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}
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while ((ret = StackWalkEx(dbg_curr_process->be_cpu->machine, dbg_curr_process->handle,
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dbg_curr_thread->handle, &sf, &ctx, stack_read_mem,
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SymFunctionTableAccess64, SymGetModuleBase64, NULL, SYM_STKWALK_DEFAULT)) ||
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nf == 0) /* we always register first frame information */
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{
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dbg_curr_thread->frames = dbg_heap_realloc(dbg_curr_thread->frames,
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(nf + 1) * sizeof(dbg_curr_thread->frames[0]));
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dbg_curr_thread->frames[nf].addr_pc = sf.AddrPC;
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dbg_curr_thread->frames[nf].linear_pc = (DWORD_PTR)memory_to_linear_addr(&sf.AddrPC);
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dbg_curr_thread->frames[nf].addr_frame = sf.AddrFrame;
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dbg_curr_thread->frames[nf].linear_frame = (DWORD_PTR)memory_to_linear_addr(&sf.AddrFrame);
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dbg_curr_thread->frames[nf].addr_stack = sf.AddrStack;
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dbg_curr_thread->frames[nf].linear_stack = (DWORD_PTR)memory_to_linear_addr(&sf.AddrStack);
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dbg_curr_thread->frames[nf].context = ctx;
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dbg_curr_thread->frames[nf].inline_ctx = sf.InlineFrameContext;
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/* FIXME: can this heuristic be improved: we declare first context always valid, and next ones
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* if it has been modified by the call to StackWalk...
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*/
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dbg_curr_thread->frames[nf].is_ctx_valid =
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(nf == 0 ||
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(dbg_curr_thread->frames[nf - 1].is_ctx_valid &&
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memcmp(&dbg_curr_thread->frames[nf - 1].context, &ctx, sizeof(ctx))));
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nf++;
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/* bail if:
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* - we've (probably) gotten ourselves into an infinite loop,
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* - or StackWalk failed on first frame
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*/
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if (nf > 200 || !ret) break;
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}
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dbg_curr_thread->curr_frame = -1;
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dbg_curr_thread->num_frames = nf;
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stack_set_frame_internal(0);
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return nf;
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}
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struct sym_enum
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{
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DWORD_PTR frame;
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BOOL first;
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};
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static BOOL WINAPI sym_enum_cb(PSYMBOL_INFO sym_info, ULONG size, PVOID user)
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{
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struct sym_enum* se = user;
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if (sym_info->Flags & SYMFLAG_PARAMETER)
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{
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if (!se->first) dbg_printf(", "); else se->first = FALSE;
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symbol_print_local(sym_info, se->frame, FALSE);
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}
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return TRUE;
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}
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static void stack_print_addr_and_args(void)
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{
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char buffer[sizeof(SYMBOL_INFO) + 256];
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SYMBOL_INFO* si = (SYMBOL_INFO*)buffer;
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IMAGEHLP_LINE64 il;
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IMAGEHLP_MODULE im;
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DWORD64 disp64;
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struct dbg_frame* frm = stack_get_curr_frame();
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if (!frm) return;
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print_bare_address(&frm->addr_pc);
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/* grab module where symbol is. If we don't have a module, we cannot print more */
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im.SizeOfStruct = sizeof(im);
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if (!SymGetModuleInfo(dbg_curr_process->handle, frm->linear_pc, &im))
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return;
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si->SizeOfStruct = sizeof(*si);
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si->MaxNameLen = 256;
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if (SymFromInlineContext(dbg_curr_process->handle, frm->linear_pc, frm->inline_ctx, &disp64, si))
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{
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struct sym_enum se;
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DWORD disp;
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dbg_printf(" %s", si->Name);
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if (disp64) dbg_printf("+0x%I64x", disp64);
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stack_set_local_scope();
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se.first = TRUE;
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se.frame = frm->linear_frame;
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dbg_printf("(");
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SymEnumSymbols(dbg_curr_process->handle, 0, NULL, sym_enum_cb, &se);
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dbg_printf(")");
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il.SizeOfStruct = sizeof(il);
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if (SymGetLineFromInlineContext(dbg_curr_process->handle, frm->linear_pc, frm->inline_ctx,
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0, &disp, &il))
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dbg_printf(" [%s:%lu]", il.FileName, il.LineNumber);
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dbg_printf(" in %s", im.ModuleName);
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}
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else dbg_printf(" in %s (+0x%Ix)", im.ModuleName, frm->linear_pc - im.BaseOfImage);
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}
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/******************************************************************
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* backtrace
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*
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* Do a backtrace on the current thread
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*/
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static void backtrace(void)
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{
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unsigned cf = dbg_curr_thread->curr_frame;
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dbg_printf("Backtrace:\n");
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for (dbg_curr_thread->curr_frame = 0;
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dbg_curr_thread->curr_frame < dbg_curr_thread->num_frames;
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dbg_curr_thread->curr_frame++)
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{
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dbg_printf("%s%d ",
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(cf == dbg_curr_thread->curr_frame ? "=>" : " "),
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dbg_curr_thread->curr_frame);
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stack_print_addr_and_args();
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dbg_printf(" (");
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print_bare_address(&dbg_curr_thread->frames[dbg_curr_thread->curr_frame].addr_frame);
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dbg_printf(")\n");
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}
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/* reset context to current stack frame */
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dbg_curr_thread->curr_frame = cf;
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if (!dbg_curr_thread->frames) return;
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stack_set_local_scope();
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}
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/******************************************************************
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* backtrace_tid
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*
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* Do a backtrace on a thread from its process and its identifier
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* (preserves current thread and context information)
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*/
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static void backtrace_tid(struct dbg_process* pcs, DWORD tid)
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{
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struct dbg_thread* thread = dbg_curr_thread;
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if (!(dbg_curr_thread = dbg_get_thread(pcs, tid)))
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dbg_printf("Unknown thread id (%04lx) in process (%04lx)\n", tid, pcs->pid);
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else
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{
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dbg_ctx_t ctx = {{0}};
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dbg_curr_tid = dbg_curr_thread->tid;
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if (SuspendThread(dbg_curr_thread->handle) != -1)
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{
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if (!pcs->be_cpu->get_context(dbg_curr_thread->handle, &ctx))
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{
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dbg_printf("Can't get context for thread %04lx in current process\n",
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tid);
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}
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else
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{
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stack_fetch_frames(&ctx);
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backtrace();
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}
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ResumeThread(dbg_curr_thread->handle);
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}
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else dbg_printf("Can't suspend thread %04lx in current process\n", tid);
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}
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dbg_curr_thread = thread;
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dbg_curr_tid = thread ? thread->tid : 0;
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}
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/******************************************************************
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* backtrace_all
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*
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* Do a backtrace on every running thread in the system (except the debugger)
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* (preserves current process information)
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*/
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static void backtrace_all(void)
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{
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struct dbg_process* process = dbg_curr_process;
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struct dbg_thread* thread = dbg_curr_thread;
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dbg_ctx_t ctx = dbg_context;
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DWORD cpid = dbg_curr_pid;
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THREADENTRY32 entry;
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HANDLE snapshot = CreateToolhelp32Snapshot(TH32CS_SNAPTHREAD, 0);
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if (snapshot == INVALID_HANDLE_VALUE)
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{
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dbg_printf("Unable to create toolhelp snapshot\n");
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return;
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}
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entry.dwSize = sizeof(entry);
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if (Thread32First(snapshot, &entry))
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{
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do
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{
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if (entry.th32OwnerProcessID == GetCurrentProcessId()) continue;
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if (dbg_curr_process && dbg_curr_pid != entry.th32OwnerProcessID &&
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cpid != dbg_curr_pid)
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dbg_curr_process->process_io->close_process(dbg_curr_process, FALSE);
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if (entry.th32OwnerProcessID == cpid)
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{
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dbg_curr_process = process;
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dbg_curr_pid = cpid;
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}
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else if (entry.th32OwnerProcessID != dbg_curr_pid)
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{
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if (!dbg_attach_debuggee(entry.th32OwnerProcessID))
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{
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dbg_printf("\nwarning: could not attach to %04lx\n",
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entry.th32OwnerProcessID);
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continue;
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}
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dbg_curr_pid = dbg_curr_process->pid;
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dbg_active_wait_for_first_exception();
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}
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dbg_printf("\nBacktracing for thread %04lx in process %04lx (%ls):\n",
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entry.th32ThreadID, dbg_curr_pid, dbg_curr_process->imageName);
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backtrace_tid(dbg_curr_process, entry.th32ThreadID);
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}
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while (Thread32Next(snapshot, &entry));
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if (dbg_curr_process && cpid != dbg_curr_pid)
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dbg_curr_process->process_io->close_process(dbg_curr_process, FALSE);
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}
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CloseHandle(snapshot);
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dbg_curr_process = process;
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dbg_curr_pid = cpid;
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dbg_curr_thread = thread;
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dbg_curr_tid = thread ? thread->tid : 0;
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dbg_context = ctx;
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}
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void stack_backtrace(DWORD tid)
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{
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/* backtrace every thread in every process except the debugger itself,
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* invoking via "bt all"
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*/
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if (tid == -1)
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{
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backtrace_all();
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return;
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}
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if (!dbg_curr_process)
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{
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dbg_printf("You must be attached to a process to run this command.\n");
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return;
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}
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if (tid == dbg_curr_tid)
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{
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backtrace();
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}
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else
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{
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backtrace_tid(dbg_curr_process, tid);
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}
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}
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