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Sweden-Number/debugger/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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include <stdlib.h>
#include "debugger.h"
#include "stackframe.h"
#include "winbase.h"
#ifdef __i386__
/*
* We keep this info for each frame, so that we can
* find local variable information correctly.
*/
struct bt_info
{
unsigned int cs;
unsigned int eip;
unsigned int ss;
unsigned int ebp;
struct symbol_info frame;
};
static int nframe;
static struct bt_info * frames = NULL;
typedef struct
{
WORD bp;
WORD ip;
WORD cs;
} FRAME16;
typedef struct
{
DWORD bp;
DWORD ip;
WORD cs;
} FRAME32;
#endif
/***********************************************************************
* DEBUG_InfoStack
*
* Dump the top of the stack
*/
void DEBUG_InfoStack(void)
{
#ifdef __i386__
DBG_VALUE value;
value.type = NULL;
value.cookie = DV_TARGET;
value.addr.seg = DEBUG_context.SegSs;
value.addr.off = DEBUG_context.Esp;
DEBUG_Printf(DBG_CHN_MESG,"Stack dump:\n");
switch (DEBUG_GetSelectorType(value.addr.seg))
{
case MODE_32: /* 32-bit mode */
DEBUG_ExamineMemory( &value, 24, 'x' );
break;
case MODE_16: /* 16-bit mode */
case MODE_VM86:
value.addr.off &= 0xffff;
DEBUG_ExamineMemory( &value, 24, 'w' );
break;
default:
DEBUG_Printf(DBG_CHN_MESG, "Bad segment (%ld)\n", value.addr.seg);
}
DEBUG_Printf(DBG_CHN_MESG,"\n");
#endif
}
#ifdef __i386__
static void DEBUG_ForceFrame(DBG_ADDR *stack, DBG_ADDR *code, int frameno, enum dbg_mode mode,
int noisy, const char *caveat)
{
int theframe = nframe++;
frames = (struct bt_info *)DBG_realloc(frames,
nframe*sizeof(struct bt_info));
if (noisy)
DEBUG_Printf(DBG_CHN_MESG,"%s%d ", (theframe == curr_frame ? "=>" : " "),
frameno);
frames[theframe].cs = code->seg;
frames[theframe].eip = code->off;
if (noisy)
frames[theframe].frame = DEBUG_PrintAddressAndArgs( code, mode, stack->off, TRUE );
else
DEBUG_FindNearestSymbol( code, TRUE,
&frames[theframe].frame.sym, stack->off,
&frames[theframe].frame.list);
frames[theframe].ss = stack->seg;
frames[theframe].ebp = stack->off;
if (noisy) {
DEBUG_Printf( DBG_CHN_MESG, (mode != MODE_32) ? " (bp=%04lx%s)\n" : " (ebp=%08lx%s)\n",
stack->off, caveat?caveat:"" );
}
}
static BOOL DEBUG_Frame16(DBG_THREAD* thread, DBG_ADDR *addr, unsigned int *cs, int frameno, int noisy)
{
unsigned int possible_cs = 0;
FRAME16 frame;
void* p = (void*)DEBUG_ToLinear(addr);
DBG_ADDR code;
if (!p) return FALSE;
if (!DEBUG_READ_MEM(p, &frame, sizeof(frame))) {
if (noisy) DEBUG_InvalAddr(addr);
return FALSE;
}
if (!frame.bp) return FALSE;
if (frame.bp & 1) *cs = frame.cs;
else {
/* not explicitly marked as far call,
* but check whether it could be anyway */
if (((frame.cs&7)==7) && (frame.cs != *cs)) {
LDT_ENTRY le;
if (GetThreadSelectorEntry( thread->handle, frame.cs, &le) &&
(le.HighWord.Bits.Type & 0x08)) { /* code segment */
/* it is very uncommon to push a code segment cs as
* a parameter, so this should work in most cases */
*cs = possible_cs = frame.cs;
}
}
}
code.seg = *cs;
code.off = frame.ip;
addr->off = frame.bp & ~1;
DEBUG_ForceFrame(addr, &code, frameno, MODE_16, noisy,
possible_cs ? ", far call assumed" : NULL );
return TRUE;
}
static BOOL DEBUG_Frame32(DBG_ADDR *addr, unsigned int *cs, int frameno, int noisy)
{
FRAME32 frame;
void* p = (void*)DEBUG_ToLinear(addr);
DBG_ADDR code;
DWORD old_bp = addr->off;
if (!p) return FALSE;
if (!DEBUG_READ_MEM(p, &frame, sizeof(frame))) {
if (noisy) DEBUG_InvalAddr(addr);
return FALSE;
}
if (!frame.ip) return FALSE;
code.seg = *cs;
code.off = frame.ip;
addr->off = frame.bp;
DEBUG_ForceFrame(addr, &code, frameno, MODE_32, noisy, NULL);
if (addr->off == old_bp) return FALSE;
return TRUE;
}
#endif
/***********************************************************************
* DEBUG_BackTrace
*
* Display a stack back-trace.
*/
void DEBUG_BackTrace(DWORD tid, BOOL noisy)
{
#ifdef __i386
DBG_ADDR addr, sw_addr, code, tmp;
unsigned int ss, cs;
int frameno = 0, is16, ok;
DWORD next_switch, cur_switch, p;
STACK16FRAME frame16;
STACK32FRAME frame32;
char ch;
CONTEXT ctx;
DBG_THREAD* thread;
int copy_nframe = 0;
int copy_curr_frame = 0;
struct bt_info* copy_frames = NULL;
if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Backtrace:\n" );
if (tid == DEBUG_CurrTid)
{
ctx = DEBUG_context;
thread = DEBUG_CurrThread;
if (frames) DBG_free( frames );
/* frames = (struct bt_info *) DBG_alloc( sizeof(struct bt_info) ); */
}
else
{
thread = DEBUG_GetThread(DEBUG_CurrProcess, tid);
if (!thread)
{
DEBUG_Printf( DBG_CHN_MESG, "Unknown thread id (0x%08lx) in current process\n", tid);
return;
}
memset(&ctx, 0, sizeof(ctx));
ctx.ContextFlags = CONTEXT_CONTROL | CONTEXT_SEGMENTS;
if ( SuspendThread( thread->handle ) == -1 ||
!GetThreadContext( thread->handle, &ctx ))
{
DEBUG_Printf( DBG_CHN_MESG, "Can't get context for thread id (0x%08lx) in current process\n", tid);
return;
}
/* need to avoid trashing stack frame for current thread */
copy_nframe = nframe;
copy_frames = frames;
copy_curr_frame = curr_frame;
curr_frame = 0;
}
nframe = 0;
frames = NULL;
cs = ctx.SegCs;
ss = ctx.SegSs;
if (DEBUG_IsSelectorSystem(ss)) ss = 0;
if (DEBUG_IsSelectorSystem(cs)) cs = 0;
/* first stack frame from registers */
switch (DEBUG_GetSelectorType(ss))
{
case MODE_32:
code.seg = cs;
code.off = ctx.Eip;
addr.seg = ss;
addr.off = ctx.Ebp;
DEBUG_ForceFrame( &addr, &code, frameno, MODE_32, noisy, NULL );
if (!(code.seg || code.off)) {
/* trying to execute a null pointer... yuck...
* if it was a call to null, the return EIP should be
* available at SS:ESP, so let's try to retrieve it */
tmp.seg = ss;
tmp.off = ctx.Esp;
if (DEBUG_READ_MEM((void *)DEBUG_ToLinear(&tmp), &code.off, sizeof(code.off))) {
DEBUG_ForceFrame( &addr, &code, ++frameno, MODE_32, noisy, ", null call assumed" );
}
}
is16 = FALSE;
break;
case MODE_16:
case MODE_VM86:
code.seg = cs;
code.off = LOWORD(ctx.Eip);
addr.seg = ss;
addr.off = LOWORD(ctx.Ebp);
DEBUG_ForceFrame( &addr, &code, frameno, MODE_16, noisy, NULL );
is16 = TRUE;
break;
default:
if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Bad segment '%x'\n", ss);
return;
}
/* cur_switch holds address of curr_stack's field in TEB in debuggee
* address space
*/
cur_switch = (DWORD)thread->teb + OFFSET_OF(TEB, cur_stack);
if (!DEBUG_READ_MEM((void*)cur_switch, &next_switch, sizeof(next_switch))) {
if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Can't read TEB:cur_stack\n");
return;
}
if (is16) {
if (!DEBUG_READ_MEM((void*)next_switch, &frame32, sizeof(STACK32FRAME))) {
if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Bad stack frame 0x%08lx\n",
(unsigned long)(STACK32FRAME*)next_switch );
return;
}
cur_switch = (DWORD)frame32.frame16;
sw_addr.seg = SELECTOROF(cur_switch);
sw_addr.off = OFFSETOF(cur_switch);
} else {
tmp.seg = SELECTOROF(next_switch);
tmp.off = OFFSETOF(next_switch);
p = DEBUG_ToLinear(&tmp);
if (!DEBUG_READ_MEM((void*)p, &frame16, sizeof(STACK16FRAME))) {
if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Bad stack frame 0x%08lx\n",
(unsigned long)(STACK16FRAME*)p );
return;
}
cur_switch = (DWORD)frame16.frame32;
sw_addr.seg = ss;
sw_addr.off = cur_switch;
}
if (!DEBUG_READ_MEM((void*)DEBUG_ToLinear(&sw_addr), &ch, sizeof(ch))) {
sw_addr.seg = (DWORD)-1;
sw_addr.off = (DWORD)-1;
}
for (ok = TRUE; ok;) {
if ((frames[frameno].ss == sw_addr.seg) &&
sw_addr.off && (frames[frameno].ebp >= sw_addr.off))
{
/* 16<->32 switch...
* yes, I know this is confusing, it gave me a headache too */
if (is16) {
if (!DEBUG_READ_MEM((void*)next_switch, &frame32, sizeof(STACK32FRAME))) {
if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Bad stack frame 0x%08lx\n",
(unsigned long)(STACK32FRAME*)next_switch );
return;
}
code.seg = 0;
code.off = frame32.retaddr;
cs = 0;
addr.seg = 0;
addr.off = frame32.ebp;
DEBUG_ForceFrame( &addr, &code, ++frameno, MODE_32, noisy, NULL );
next_switch = cur_switch;
tmp.seg = SELECTOROF(next_switch);
tmp.off = OFFSETOF(next_switch);
p = DEBUG_ToLinear(&tmp);
if (!DEBUG_READ_MEM((void*)p, &frame16, sizeof(STACK16FRAME))) {
if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Bad stack frame 0x%08lx\n",
(unsigned long)(STACK16FRAME*)p );
return;
}
cur_switch = (DWORD)frame16.frame32;
sw_addr.seg = 0;
sw_addr.off = cur_switch;
is16 = FALSE;
} else {
tmp.seg = SELECTOROF(next_switch);
tmp.off = OFFSETOF(next_switch);
p = DEBUG_ToLinear(&tmp);
if (!DEBUG_READ_MEM((void*)p, &frame16, sizeof(STACK16FRAME))) {
if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Bad stack frame 0x%08lx\n",
(unsigned long)(STACK16FRAME*)p );
return;
}
code.seg = frame16.cs;
code.off = frame16.ip;
cs = frame16.cs;
addr.seg = SELECTOROF(next_switch);
addr.off = frame16.bp;
DEBUG_ForceFrame( &addr, &code, ++frameno, MODE_16, noisy, NULL );
next_switch = cur_switch;
if (!DEBUG_READ_MEM((void*)next_switch, &frame32, sizeof(STACK32FRAME))) {
if (noisy) DEBUG_Printf( DBG_CHN_MESG, "Bad stack frame 0x%08lx\n",
(unsigned long)(STACK32FRAME*)next_switch );
return;
}
cur_switch = (DWORD)frame32.frame16;
sw_addr.seg = SELECTOROF(cur_switch);
sw_addr.off = OFFSETOF(cur_switch);
is16 = TRUE;
}
if (!DEBUG_READ_MEM((void*)DEBUG_ToLinear(&sw_addr), &ch, sizeof(ch))) {
sw_addr.seg = (DWORD)-1;
sw_addr.off = (DWORD)-1;
}
} else {
/* ordinary stack frame */
ok = is16 ? DEBUG_Frame16( thread, &addr, &cs, ++frameno, noisy)
: DEBUG_Frame32( &addr, &cs, ++frameno, noisy);
}
}
if (noisy) DEBUG_Printf( DBG_CHN_MESG, "\n" );
if (tid != DEBUG_CurrTid)
{
ResumeThread( thread->handle );
/* restore stack frame for current thread */
if (frames) DBG_free( frames );
frames = copy_frames;
nframe = copy_nframe;
curr_frame = copy_curr_frame;
}
#endif
}
int
DEBUG_SetFrame(int newframe)
{
#ifdef __i386__
int rtn = FALSE;
curr_frame = newframe;
if( curr_frame >= nframe )
{
curr_frame = nframe - 1;
}
if( curr_frame < 0 )
{
curr_frame = 0;
}
if( frames && frames[curr_frame].frame.list.sourcefile != NULL )
{
DEBUG_List(&frames[curr_frame].frame.list, NULL, 0);
}
rtn = TRUE;
return (rtn);
#else /* __i386__ */
return FALSE;
#endif /* __i386__ */
}
int
DEBUG_GetCurrentFrame(struct name_hash ** name, unsigned int * eip,
unsigned int * ebp)
{
#ifdef __i386__
/*
* If we don't have a valid backtrace, then just return.
*/
if( frames == NULL )
{
return FALSE;
}
/*
* If we don't know what the current function is, then we also have
* nothing to report here.
*/
if( frames[curr_frame].frame.sym == NULL )
{
return FALSE;
}
*name = frames[curr_frame].frame.sym;
*eip = frames[curr_frame].eip;
*ebp = frames[curr_frame].ebp;
return TRUE;
#else /* __i386__ */
return FALSE;
#endif /* __i386__ */
}
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