Sweden-Number/debugger/stack.c

253 lines
6.1 KiB
C

/*
* Debugger stack handling
*
* Copyright 1995 Alexandre Julliard
* Copyright 1996 Eric Youngdale
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include "xmalloc.h"
#include "debugger.h"
/*
* We keep this info for each frame, so that we can
* find local variable information correctly.
*/
struct bt_info
{
unsigned int eip;
unsigned int ess;
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 = { NULL, SS_reg(&DEBUG_context), 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");
}
/***********************************************************************
* DEBUG_BackTrace
*
* Display a stack back-trace.
*/
void DEBUG_BackTrace(void)
{
DBG_ADDR addr;
int frameno = 0;
fprintf(stderr,"Backtrace:\n");
if (IS_SELECTOR_SYSTEM(SS_reg(&DEBUG_context))) /* system stack */
{
nframe = 1;
if (frames) free( frames );
frames = (struct bt_info *) xmalloc( sizeof(struct bt_info) );
fprintf(stderr,"%s%d ",(curr_frame == 0 ? "=>" : " "), frameno++);
addr.seg = 0;
addr.off = EIP_reg(&DEBUG_context);
frames[0].eip = addr.off;
frames[0].frame = DEBUG_PrintAddress( &addr, 32, TRUE );
fprintf( stderr, "\n" );
frames[0].ebp = addr.off = EBP_reg(&DEBUG_context);
while (addr.off)
{
FRAME32 *frame = (FRAME32 *)addr.off;
if (!DBG_CHECK_READ_PTR( &addr, sizeof(FRAME32) )) return;
if (!frame->ip) break;
nframe++;
frames = (struct bt_info *)xrealloc(frames,
nframe*sizeof(struct bt_info));
fprintf(stderr,"%s%d ", (frameno == curr_frame ? "=>" : " "),
frameno);
addr.off = frame->ip;
frames[frameno].eip = addr.off;
frames[frameno].ebp = frame->bp;
frames[frameno].frame = DEBUG_PrintAddressAndArgs( &addr, 32,
frame->bp, TRUE );
frameno++;
fprintf( stderr, "\n" );
if (addr.off == frame->bp) break;
addr.off = frame->bp;
}
}
else /* 16-bit mode */
{
WORD ss = SS_reg(&DEBUG_context), cs = CS_reg(&DEBUG_context);
if (GET_SEL_FLAGS(ss) & LDT_FLAGS_32BIT)
{
fprintf( stderr, "Not implemented: 32-bit backtrace on a different stack segment.\n" );
return;
}
fprintf( stderr,"%d ", frameno++ );
addr.seg = cs;
addr.off = IP_reg(&DEBUG_context);
DEBUG_PrintAddress( &addr, 16, TRUE );
fprintf( stderr, "\n" );
addr.seg = ss;
addr.off = BP_reg(&DEBUG_context) & ~1;
for (;;)
{
FRAME16 *frame = (FRAME16 *)DBG_ADDR_TO_LIN(&addr);
if (!DBG_CHECK_READ_PTR( &addr, sizeof(FRAME16) )) return;
if (!frame->bp) break;
if (frame->bp & 1) cs = frame->cs;
fprintf( stderr,"%d ", frameno++ );
addr.seg = cs;
addr.off = frame->ip;
DEBUG_PrintAddress( &addr, 16, TRUE );
fprintf( stderr, "\n" );
addr.seg = ss;
addr.off = frame->bp & ~1;
}
}
fprintf( stderr, "\n" );
}
/***********************************************************************
* DEBUG_SilentBackTrace
*
* Display a stack back-trace.
*/
void DEBUG_SilentBackTrace(void)
{
DBG_ADDR addr;
int frameno = 0;
nframe = 1;
if (frames) free( frames );
frames = (struct bt_info *) xmalloc( sizeof(struct bt_info) );
if (IS_SELECTOR_SYSTEM(SS_reg(&DEBUG_context))) /* system stack */
{
addr.seg = 0;
addr.off = EIP_reg(&DEBUG_context);
frames[0].eip = addr.off;
DEBUG_FindNearestSymbol( &addr, TRUE, &frames[0].frame.sym, 0,
&frames[0].frame.list);
frames[0].ebp = addr.off = EBP_reg(&DEBUG_context);
frameno++;
while (addr.off)
{
FRAME32 *frame = (FRAME32 *)addr.off;
if (!DBG_CHECK_READ_PTR( &addr, sizeof(FRAME32) )) return;
if (!frame->ip) break;
nframe++;
frames = (struct bt_info *)xrealloc(frames,
nframe*sizeof(struct bt_info));
addr.off = frame->ip;
frames[frameno].eip = addr.off;
frames[frameno].ebp = frame->bp;
DEBUG_FindNearestSymbol( &addr, TRUE,
&frames[frameno].frame.sym, frame->bp,
&frames[frameno].frame.list);
frameno++;
addr.off = frame->bp;
}
}
else /* 16-bit mode */
{
/*
* Not implemented here. I am not entirely sure how best to handle
* this stuff.
*/
}
}
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;
}