355 lines
9.7 KiB
C
355 lines
9.7 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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#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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#include "stackframe.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 cs;
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unsigned int eip;
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unsigned int ss;
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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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static void DEBUG_ForceFrame(DBG_ADDR *stack, DBG_ADDR *code, int frameno, int bits, int noisy)
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{
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int theframe = 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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if (noisy)
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fprintf(stderr,"%s%d ", (theframe == curr_frame ? "=>" : " "),
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frameno);
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frames[theframe].cs = code->seg;
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frames[theframe].eip = code->off;
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if (noisy)
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frames[theframe].frame = DEBUG_PrintAddressAndArgs( code, bits,
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stack->off, TRUE );
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else
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DEBUG_FindNearestSymbol( code, TRUE,
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&frames[theframe].frame.sym, stack->off,
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&frames[theframe].frame.list);
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frames[theframe].ss = stack->seg;
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frames[theframe].ebp = stack->off;
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if (noisy) {
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fprintf( stderr, (bits == 16) ? " (bp=%04lx)\n" : " (ebp=%08lx)\n", stack->off );
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}
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}
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static BOOL DEBUG_Frame16(DBG_ADDR *addr, unsigned int *cs, int frameno, int noisy)
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{
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unsigned int ss = addr->seg, possible_cs = 0;
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FRAME16 *frame = (FRAME16 *)DBG_ADDR_TO_LIN(addr);
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int theframe = nframe;
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if (!DBG_CHECK_READ_PTR( addr, sizeof(FRAME16) )) return FALSE;
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if (!frame->bp) return FALSE;
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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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if (noisy)
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fprintf(stderr,"%s%d ", (theframe == curr_frame ? "=>" : " "),
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frameno);
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if (frame->bp & 1) *cs = frame->cs;
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else {
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/* not explicitly marked as far call,
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* but check whether it could be anyway */
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if (((frame->cs&7)==7) && (frame->cs != *cs) && !IS_SELECTOR_FREE(frame->cs)) {
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ldt_entry tcs;
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LDT_GetEntry( SELECTOR_TO_ENTRY(frame->cs), &tcs );
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if ( tcs.type == SEGMENT_CODE ) {
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/* it is very uncommon to push a code segment cs as
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* a parameter, so this should work in most cases */
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*cs = possible_cs = frame->cs;
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}
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}
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}
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frames[theframe].cs = addr->seg = *cs;
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frames[theframe].eip = addr->off = frame->ip;
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if (noisy)
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frames[theframe].frame = DEBUG_PrintAddressAndArgs( addr, 16,
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frame->bp, TRUE );
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else
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DEBUG_FindNearestSymbol( addr, TRUE,
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&frames[theframe].frame.sym, frame->bp,
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&frames[theframe].frame.list);
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frames[theframe].ss = addr->seg = ss;
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frames[theframe].ebp = addr->off = frame->bp & ~1;
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if (noisy) {
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fprintf( stderr, " (bp=%04lx", addr->off );
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if (possible_cs) {
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fprintf( stderr, ", far call assumed" );
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}
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fprintf( stderr, ")\n" );
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}
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return TRUE;
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}
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static BOOL DEBUG_Frame32(DBG_ADDR *addr, unsigned int *cs, int frameno, int noisy)
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{
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unsigned int ss = addr->seg;
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FRAME32 *frame = (FRAME32 *)DBG_ADDR_TO_LIN(addr);
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int theframe = nframe;
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if (!DBG_CHECK_READ_PTR( addr, sizeof(FRAME32) )) return FALSE;
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if (!frame->ip) return FALSE;
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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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if (noisy)
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fprintf(stderr,"%s%d ", (theframe == curr_frame ? "=>" : " "),
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frameno);
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frames[theframe].cs = addr->seg = *cs;
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frames[theframe].eip = addr->off = frame->ip;
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if (noisy)
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frames[theframe].frame = DEBUG_PrintAddressAndArgs( addr, 32,
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frame->bp, TRUE );
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else
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DEBUG_FindNearestSymbol( addr, TRUE,
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&frames[theframe].frame.sym, frame->bp,
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&frames[theframe].frame.list);
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if (noisy) fprintf( stderr, " (ebp=%08lx)\n", frame->bp );
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frames[theframe].ss = addr->seg = ss;
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frames[theframe].ebp = frame->bp;
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if (addr->off == frame->bp) return FALSE;
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addr->off = frame->bp;
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return TRUE;
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}
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static void DEBUG_DoBackTrace(int noisy)
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{
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DBG_ADDR addr, sw_addr;
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unsigned int ss = SS_reg(&DEBUG_context), cs = CS_reg(&DEBUG_context);
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int frameno = 0, is16, ok;
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DWORD next_switch, cur_switch;
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if (noisy) fprintf( stderr, "Backtrace:\n" );
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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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if (IS_SELECTOR_SYSTEM(ss)) ss = 0;
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if (IS_SELECTOR_SYSTEM(cs)) cs = 0;
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/* first stack frame from registers */
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if (IS_SELECTOR_32BIT(ss))
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{
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frames[0].cs = addr.seg = cs;
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frames[0].eip = addr.off = EIP_reg(&DEBUG_context);
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if (noisy)
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frames[0].frame = DEBUG_PrintAddress( &addr, 32, TRUE );
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else
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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].ss = addr.seg = ss;
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frames[0].ebp = addr.off = EBP_reg(&DEBUG_context);
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if (noisy) fprintf( stderr, " (ebp=%08x)\n", frames[0].ebp );
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is16 = FALSE;
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} else {
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frames[0].cs = addr.seg = cs;
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frames[0].eip = addr.off = IP_reg(&DEBUG_context);
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if (noisy)
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frames[0].frame = DEBUG_PrintAddress( &addr, 16, TRUE );
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else
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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].ss = addr.seg = ss;
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frames[0].ebp = addr.off = BP_reg(&DEBUG_context);
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if (noisy) fprintf( stderr, " (bp=%04x)\n", frames[0].ebp );
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is16 = TRUE;
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}
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next_switch = THREAD_Current()->cur_stack;
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if (is16) {
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cur_switch = (DWORD)((STACK32FRAME*)next_switch)->frame16;
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sw_addr.seg = SELECTOROF(cur_switch);
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sw_addr.off = OFFSETOF(cur_switch);
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} else {
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cur_switch = (DWORD)((STACK16FRAME*)PTR_SEG_TO_LIN(next_switch))->frame32;
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sw_addr.seg = ss;
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sw_addr.off = cur_switch;
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}
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for (ok = TRUE; ok;) {
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if ((frames[frameno].ss == sw_addr.seg) &&
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(frames[frameno].ebp >= sw_addr.off)) {
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/* 16<->32 switch...
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* yes, I know this is confusing, it gave me a headache too */
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if (is16) {
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STACK32FRAME *frame = (STACK32FRAME*)next_switch;
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DBG_ADDR code = { NULL, 0, frame->retaddr };
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cs = 0;
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addr.seg = 0;
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addr.off = frame->ebp;
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DEBUG_ForceFrame( &addr, &code, ++frameno, 32, noisy );
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next_switch = cur_switch;
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cur_switch = (DWORD)((STACK16FRAME*)PTR_SEG_TO_LIN(next_switch))->frame32;
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sw_addr.seg = 0;
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sw_addr.off = cur_switch;
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is16 = FALSE;
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} else {
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STACK16FRAME *frame = (STACK16FRAME*)PTR_SEG_TO_LIN(next_switch);
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DBG_ADDR code = { NULL, frame->cs, frame->ip };
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cs = frame->cs;
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addr.seg = SELECTOROF(next_switch);
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addr.off = frame->bp;
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DEBUG_ForceFrame( &addr, &code, ++frameno, 16, noisy );
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next_switch = cur_switch;
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cur_switch = (DWORD)((STACK32FRAME*)next_switch)->frame16;
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sw_addr.seg = SELECTOROF(cur_switch);
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sw_addr.off = OFFSETOF(cur_switch);
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is16 = TRUE;
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}
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} else {
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/* ordinary stack frame */
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ok = is16 ? DEBUG_Frame16( &addr, &cs, ++frameno, noisy)
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: DEBUG_Frame32( &addr, &cs, ++frameno, noisy);
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}
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}
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if (noisy) 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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DEBUG_DoBackTrace( TRUE );
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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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DEBUG_DoBackTrace( FALSE );
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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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