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dda17c681f
heap. Not enabled by default, change #if in include/debugger.h to use this (the heap allocator is very slow).
255 lines
6.1 KiB
C
255 lines
6.1 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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*/
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#include "config.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include "debugger.h"
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/*
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* We keep this info for each frame, so that we can
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* find local variable information correctly.
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*/
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struct bt_info
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{
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unsigned int eip;
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unsigned int ess;
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unsigned int ebp;
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struct symbol_info frame;
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};
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static int nframe;
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static struct bt_info * frames = NULL;
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int curr_frame;
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typedef struct
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{
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WORD bp;
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WORD ip;
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WORD cs;
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} FRAME16;
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typedef struct
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{
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DWORD bp;
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DWORD ip;
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WORD cs;
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} FRAME32;
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/***********************************************************************
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* DEBUG_InfoStack
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*
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* Dump the top of the stack
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*/
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void DEBUG_InfoStack(void)
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{
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DBG_ADDR addr;
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addr.type = NULL;
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addr.seg = SS_reg(&DEBUG_context);
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addr.off = ESP_reg(&DEBUG_context);
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fprintf(stderr,"Stack dump:\n");
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if (IS_SELECTOR_32BIT(addr.seg))
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{ /* 32-bit mode */
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DEBUG_ExamineMemory( &addr, 24, 'x' );
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}
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else /* 16-bit mode */
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{
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addr.off &= 0xffff;
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DEBUG_ExamineMemory( &addr, 24, 'w' );
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}
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fprintf(stderr,"\n");
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}
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/***********************************************************************
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* DEBUG_BackTrace
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*
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* Display a stack back-trace.
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*/
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void DEBUG_BackTrace(void)
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{
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DBG_ADDR addr;
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int frameno = 0;
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fprintf(stderr,"Backtrace:\n");
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if (IS_SELECTOR_SYSTEM(SS_reg(&DEBUG_context))) /* system stack */
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{
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nframe = 1;
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if (frames) DBG_free( frames );
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frames = (struct bt_info *) DBG_alloc( sizeof(struct bt_info) );
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fprintf(stderr,"%s%d ",(curr_frame == 0 ? "=>" : " "), frameno++);
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addr.seg = 0;
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addr.off = EIP_reg(&DEBUG_context);
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frames[0].eip = addr.off;
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frames[0].frame = DEBUG_PrintAddress( &addr, 32, TRUE );
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fprintf( stderr, "\n" );
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frames[0].ebp = addr.off = EBP_reg(&DEBUG_context);
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while (addr.off)
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{
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FRAME32 *frame = (FRAME32 *)addr.off;
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if (!DBG_CHECK_READ_PTR( &addr, sizeof(FRAME32) )) return;
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if (!frame->ip) break;
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nframe++;
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frames = (struct bt_info *)DBG_realloc(frames,
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nframe*sizeof(struct bt_info));
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fprintf(stderr,"%s%d ", (frameno == curr_frame ? "=>" : " "),
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frameno);
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addr.off = frame->ip;
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frames[frameno].eip = addr.off;
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frames[frameno].ebp = frame->bp;
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frames[frameno].frame = DEBUG_PrintAddressAndArgs( &addr, 32,
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frame->bp, TRUE );
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frameno++;
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fprintf( stderr, "\n" );
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if (addr.off == frame->bp) break;
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addr.off = frame->bp;
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}
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}
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else /* 16-bit mode */
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{
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WORD ss = SS_reg(&DEBUG_context), cs = CS_reg(&DEBUG_context);
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if (GET_SEL_FLAGS(ss) & LDT_FLAGS_32BIT)
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{
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fprintf( stderr, "Not implemented: 32-bit backtrace on a different stack segment.\n" );
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return;
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}
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fprintf( stderr,"%d ", frameno++ );
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addr.seg = cs;
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addr.off = IP_reg(&DEBUG_context);
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DEBUG_PrintAddress( &addr, 16, TRUE );
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fprintf( stderr, "\n" );
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addr.seg = ss;
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addr.off = BP_reg(&DEBUG_context) & ~1;
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for (;;)
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{
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FRAME16 *frame = (FRAME16 *)DBG_ADDR_TO_LIN(&addr);
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if (!DBG_CHECK_READ_PTR( &addr, sizeof(FRAME16) )) return;
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if (!frame->bp) break;
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if (frame->bp & 1) cs = frame->cs;
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fprintf( stderr,"%d ", frameno++ );
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addr.seg = cs;
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addr.off = frame->ip;
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DEBUG_PrintAddress( &addr, 16, TRUE );
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fprintf( stderr, "\n" );
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addr.seg = ss;
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addr.off = frame->bp & ~1;
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}
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}
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fprintf( stderr, "\n" );
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}
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/***********************************************************************
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* DEBUG_SilentBackTrace
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*
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* Display a stack back-trace.
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*/
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void DEBUG_SilentBackTrace(void)
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{
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DBG_ADDR addr;
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int frameno = 0;
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nframe = 1;
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if (frames) DBG_free( frames );
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frames = (struct bt_info *) DBG_alloc( sizeof(struct bt_info) );
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if (IS_SELECTOR_SYSTEM(SS_reg(&DEBUG_context))) /* system stack */
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{
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addr.seg = 0;
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addr.off = EIP_reg(&DEBUG_context);
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frames[0].eip = addr.off;
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DEBUG_FindNearestSymbol( &addr, TRUE, &frames[0].frame.sym, 0,
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&frames[0].frame.list);
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frames[0].ebp = addr.off = EBP_reg(&DEBUG_context);
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frameno++;
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while (addr.off)
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{
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FRAME32 *frame = (FRAME32 *)addr.off;
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if (!DBG_CHECK_READ_PTR( &addr, sizeof(FRAME32) )) return;
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if (!frame->ip) break;
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nframe++;
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frames = (struct bt_info *)DBG_realloc(frames,
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nframe*sizeof(struct bt_info));
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addr.off = frame->ip;
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frames[frameno].eip = addr.off;
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frames[frameno].ebp = frame->bp;
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DEBUG_FindNearestSymbol( &addr, TRUE,
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&frames[frameno].frame.sym, frame->bp,
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&frames[frameno].frame.list);
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frameno++;
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addr.off = frame->bp;
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}
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}
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else /* 16-bit mode */
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{
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/*
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* Not implemented here. I am not entirely sure how best to handle
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* this stuff.
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*/
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}
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}
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int
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DEBUG_SetFrame(int newframe)
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{
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int rtn = FALSE;
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curr_frame = newframe;
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if( curr_frame >= nframe )
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{
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curr_frame = nframe - 1;
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}
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if( curr_frame < 0 )
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{
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curr_frame = 0;
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}
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if( frames && frames[curr_frame].frame.list.sourcefile != NULL )
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{
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DEBUG_List(&frames[curr_frame].frame.list, NULL, 0);
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}
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rtn = TRUE;
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return (rtn);
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}
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int
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DEBUG_GetCurrentFrame(struct name_hash ** name, unsigned int * eip,
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unsigned int * ebp)
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{
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/*
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* If we don't have a valid backtrace, then just return.
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*/
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if( frames == NULL )
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{
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return FALSE;
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}
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/*
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* If we don't know what the current function is, then we also have
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* nothing to report here.
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*/
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if( frames[curr_frame].frame.sym == NULL )
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{
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return FALSE;
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}
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*name = frames[curr_frame].frame.sym;
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*eip = frames[curr_frame].eip;
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*ebp = frames[curr_frame].ebp;
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return TRUE;
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}
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