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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
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include "debugger.h"
#include "stackframe.h"
/*
* 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;
int curr_frame;
typedef struct
{
WORD bp;
WORD ip;
WORD cs;
} FRAME16;
typedef struct
{
DWORD bp;
DWORD ip;
WORD cs;
} FRAME32;
/***********************************************************************
* DEBUG_InfoStack
*
* Dump the top of the stack
*/
void DEBUG_InfoStack(void)
{
DBG_ADDR addr;
addr.type = NULL;
addr.seg = SS_reg(&DEBUG_context);
addr.off = ESP_reg(&DEBUG_context);
fprintf(stderr,"Stack dump:\n");
if (IS_SELECTOR_32BIT(addr.seg))
{ /* 32-bit mode */
DEBUG_ExamineMemory( &addr, 24, 'x' );
}
else /* 16-bit mode */
{
addr.off &= 0xffff;
DEBUG_ExamineMemory( &addr, 24, 'w' );
}
fprintf(stderr,"\n");
}
static void DEBUG_ForceFrame(DBG_ADDR *stack, DBG_ADDR *code, int frameno, int bits, int noisy)
{
int theframe = nframe++;
frames = (struct bt_info *)DBG_realloc(frames,
nframe*sizeof(struct bt_info));
if (noisy)
fprintf(stderr,"%s%d ", (theframe == curr_frame ? "=>" : " "),
frameno);
frames[theframe].cs = code->seg;
frames[theframe].eip = code->off;
if (noisy)
frames[theframe].frame = DEBUG_PrintAddressAndArgs( code, bits,
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) {
fprintf( stderr, (bits == 16) ? " (bp=%04lx)\n" : " (ebp=%08lx)\n", stack->off );
}
}
static BOOL DEBUG_Frame16(DBG_ADDR *addr, unsigned int *cs, int frameno, int noisy)
{
unsigned int ss = addr->seg, possible_cs = 0;
FRAME16 *frame = (FRAME16 *)DBG_ADDR_TO_LIN(addr);
int theframe = nframe;
if (!DBG_CHECK_READ_PTR( addr, sizeof(FRAME16) )) return FALSE;
if (!frame->bp) return FALSE;
nframe++;
frames = (struct bt_info *)DBG_realloc(frames,
nframe*sizeof(struct bt_info));
if (noisy)
fprintf(stderr,"%s%d ", (theframe == curr_frame ? "=>" : " "),
frameno);
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) && !IS_SELECTOR_FREE(frame->cs)) {
ldt_entry tcs;
LDT_GetEntry( SELECTOR_TO_ENTRY(frame->cs), &tcs );
if ( tcs.type == SEGMENT_CODE ) {
/* 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;
}
}
}
frames[theframe].cs = addr->seg = *cs;
frames[theframe].eip = addr->off = frame->ip;
if (noisy)
frames[theframe].frame = DEBUG_PrintAddressAndArgs( addr, 16,
frame->bp, TRUE );
else
DEBUG_FindNearestSymbol( addr, TRUE,
&frames[theframe].frame.sym, frame->bp,
&frames[theframe].frame.list);
frames[theframe].ss = addr->seg = ss;
frames[theframe].ebp = addr->off = frame->bp & ~1;
if (noisy) {
fprintf( stderr, " (bp=%04lx", addr->off );
if (possible_cs) {
fprintf( stderr, ", far call assumed" );
}
fprintf( stderr, ")\n" );
}
return TRUE;
}
static BOOL DEBUG_Frame32(DBG_ADDR *addr, unsigned int *cs, int frameno, int noisy)
{
unsigned int ss = addr->seg;
FRAME32 *frame = (FRAME32 *)DBG_ADDR_TO_LIN(addr);
int theframe = nframe;
if (!DBG_CHECK_READ_PTR( addr, sizeof(FRAME32) )) return FALSE;
if (!frame->ip) return FALSE;
nframe++;
frames = (struct bt_info *)DBG_realloc(frames,
nframe*sizeof(struct bt_info));
if (noisy)
fprintf(stderr,"%s%d ", (theframe == curr_frame ? "=>" : " "),
frameno);
frames[theframe].cs = addr->seg = *cs;
frames[theframe].eip = addr->off = frame->ip;
if (noisy)
frames[theframe].frame = DEBUG_PrintAddressAndArgs( addr, 32,
frame->bp, TRUE );
else
DEBUG_FindNearestSymbol( addr, TRUE,
&frames[theframe].frame.sym, frame->bp,
&frames[theframe].frame.list);
if (noisy) fprintf( stderr, " (ebp=%08lx)\n", frame->bp );
frames[theframe].ss = addr->seg = ss;
frames[theframe].ebp = frame->bp;
if (addr->off == frame->bp) return FALSE;
addr->off = frame->bp;
return TRUE;
}
static void DEBUG_DoBackTrace(int noisy)
{
DBG_ADDR addr, sw_addr;
unsigned int ss = SS_reg(&DEBUG_context), cs = CS_reg(&DEBUG_context);
int frameno = 0, is16, ok;
DWORD next_switch, cur_switch;
if (noisy) fprintf( stderr, "Backtrace:\n" );
nframe = 1;
if (frames) DBG_free( frames );
frames = (struct bt_info *) DBG_alloc( sizeof(struct bt_info) );
if (noisy)
fprintf(stderr,"%s%d ",(curr_frame == 0 ? "=>" : " "), frameno);
if (IS_SELECTOR_SYSTEM(ss)) ss = 0;
if (IS_SELECTOR_SYSTEM(cs)) cs = 0;
/* first stack frame from registers */
if (IS_SELECTOR_32BIT(ss))
{
frames[0].cs = addr.seg = cs;
frames[0].eip = addr.off = EIP_reg(&DEBUG_context);
if (noisy)
frames[0].frame = DEBUG_PrintAddress( &addr, 32, TRUE );
else
DEBUG_FindNearestSymbol( &addr, TRUE, &frames[0].frame.sym, 0,
&frames[0].frame.list);
frames[0].ss = addr.seg = ss;
frames[0].ebp = addr.off = EBP_reg(&DEBUG_context);
if (noisy) fprintf( stderr, " (ebp=%08x)\n", frames[0].ebp );
is16 = FALSE;
} else {
frames[0].cs = addr.seg = cs;
frames[0].eip = addr.off = IP_reg(&DEBUG_context);
if (noisy)
frames[0].frame = DEBUG_PrintAddress( &addr, 16, TRUE );
else
DEBUG_FindNearestSymbol( &addr, TRUE, &frames[0].frame.sym, 0,
&frames[0].frame.list);
frames[0].ss = addr.seg = ss;
frames[0].ebp = addr.off = BP_reg(&DEBUG_context);
if (noisy) fprintf( stderr, " (bp=%04x)\n", frames[0].ebp );
is16 = TRUE;
}
next_switch = THREAD_Current()->cur_stack;
if (is16) {
if (IsBadReadPtr((STACK32FRAME*)next_switch, sizeof(STACK32FRAME))) {
fprintf( stderr, "Bad stack frame %p\n", (STACK32FRAME*)next_switch );
return;
}
cur_switch = (DWORD)((STACK32FRAME*)next_switch)->frame16;
sw_addr.seg = SELECTOROF(cur_switch);
sw_addr.off = OFFSETOF(cur_switch);
} else {
if (IsBadReadPtr((STACK16FRAME*)PTR_SEG_TO_LIN(next_switch), sizeof(STACK16FRAME))) {
fprintf( stderr, "Bad stack frame %p\n", (STACK16FRAME*)PTR_SEG_TO_LIN(next_switch) );
return;
}
cur_switch = (DWORD)((STACK16FRAME*)PTR_SEG_TO_LIN(next_switch))->frame32;
sw_addr.seg = ss;
sw_addr.off = cur_switch;
}
if (DEBUG_IsBadReadPtr(&sw_addr,1)) {
sw_addr.seg = (DWORD)-1;
sw_addr.off = (DWORD)-1;
}
for (ok = TRUE; ok;) {
if ((frames[frameno].ss == sw_addr.seg) &&
(frames[frameno].ebp >= sw_addr.off)) {
/* 16<->32 switch...
* yes, I know this is confusing, it gave me a headache too */
if (is16) {
STACK32FRAME *frame = (STACK32FRAME*)next_switch;
DBG_ADDR code;
if (IsBadReadPtr((STACK32FRAME*)next_switch, sizeof(STACK32FRAME))) {
fprintf( stderr, "Bad stack frame %p\n", (STACK32FRAME*)next_switch );
return;
}
code.type = NULL;
code.seg = 0;
code.off = frame->retaddr;
cs = 0;
addr.seg = 0;
addr.off = frame->ebp;
DEBUG_ForceFrame( &addr, &code, ++frameno, 32, noisy );
next_switch = cur_switch;
if (IsBadReadPtr((STACK16FRAME*)PTR_SEG_TO_LIN(next_switch), sizeof(STACK16FRAME))) {
fprintf( stderr, "Bad stack frame %p\n", (STACK16FRAME*)PTR_SEG_TO_LIN(next_switch) );
return;
}
cur_switch = (DWORD)((STACK16FRAME*)PTR_SEG_TO_LIN(next_switch))->frame32;
sw_addr.seg = 0;
sw_addr.off = cur_switch;
is16 = FALSE;
} else {
STACK16FRAME *frame = (STACK16FRAME*)PTR_SEG_TO_LIN(next_switch);
DBG_ADDR code;
if (IsBadReadPtr((STACK16FRAME*)PTR_SEG_TO_LIN(next_switch), sizeof(STACK16FRAME))) {
fprintf( stderr, "Bad stack frame %p\n", (STACK16FRAME*)PTR_SEG_TO_LIN(next_switch) );
return;
}
code.type = NULL;
code.seg = frame->cs;
code.off = frame->ip;
cs = frame->cs;
addr.seg = SELECTOROF(next_switch);
addr.off = frame->bp;
DEBUG_ForceFrame( &addr, &code, ++frameno, 16, noisy );
next_switch = cur_switch;
if (IsBadReadPtr((STACK32FRAME*)next_switch, sizeof(STACK32FRAME))) {
fprintf( stderr, "Bad stack frame %p\n", (STACK32FRAME*)next_switch );
return;
}
cur_switch = (DWORD)((STACK32FRAME*)next_switch)->frame16;
sw_addr.seg = SELECTOROF(cur_switch);
sw_addr.off = OFFSETOF(cur_switch);
is16 = TRUE;
}
if (DEBUG_IsBadReadPtr(&sw_addr,1)) {
sw_addr.seg = (DWORD)-1;
sw_addr.off = (DWORD)-1;
}
} else {
/* ordinary stack frame */
ok = is16 ? DEBUG_Frame16( &addr, &cs, ++frameno, noisy)
: DEBUG_Frame32( &addr, &cs, ++frameno, noisy);
}
}
if (noisy) fprintf( stderr, "\n" );
}
/***********************************************************************
* DEBUG_BackTrace
*
* Display a stack back-trace.
*/
void DEBUG_BackTrace(void)
{
DEBUG_DoBackTrace( TRUE );
}
/***********************************************************************
* DEBUG_SilentBackTrace
*
* Display a stack back-trace.
*/
void DEBUG_SilentBackTrace(void)
{
DEBUG_DoBackTrace( FALSE );
}
int
DEBUG_SetFrame(int newframe)
{
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);
}
int
DEBUG_GetCurrentFrame(struct name_hash ** name, unsigned int * eip,
unsigned int * ebp)
{
/*
* 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;
}
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