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683 lines
18 KiB
C
683 lines
18 KiB
C
/*
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* Debugger break-points handling
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*
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* Copyright 1994 Martin von Loewis
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* Copyright 1995 Alexandre Julliard
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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 <sys/types.h>
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#include <sys/mman.h>
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#include "wine/winbase16.h"
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#include "module.h"
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#include "neexe.h"
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#include "process.h"
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#include "task.h"
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#include "miscemu.h"
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#include "toolhelp.h"
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#include "debugger.h"
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#include "dosexe.h"
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#define INT3 0xcc /* int 3 opcode */
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#define MAX_BREAKPOINTS 100
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typedef struct
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{
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DBG_ADDR addr;
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BYTE addrlen;
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BYTE opcode;
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BOOL16 enabled;
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WORD skipcount;
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BOOL16 in_use;
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struct expr * condition;
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} BREAKPOINT;
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static BREAKPOINT breakpoints[MAX_BREAKPOINTS];
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static int next_bp = 1; /* breakpoint 0 is reserved for step-over */
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/***********************************************************************
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* DEBUG_ChangeOpcode
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*
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* Change the opcode at segment:addr.
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*/
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static void DEBUG_SetOpcode( const DBG_ADDR *addr, BYTE op )
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{
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BYTE *ptr = DBG_ADDR_TO_LIN(addr);
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/* There are a couple of problems with this. On Linux prior to
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1.1.62, this call fails (ENOACCESS) due to a bug in fs/exec.c.
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This code is currently not tested at all on BSD.
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How do I get the old protection in order to restore it later on?
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*/
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if (mprotect((caddr_t)((int)ptr & (~4095)), 4096,
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PROT_READ | PROT_WRITE | PROT_EXEC) == -1)
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{
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perror( "Can't set break point" );
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return;
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}
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*ptr = op;
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/* mprotect((caddr_t)(addr->off & ~4095), 4096,
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PROT_READ | PROT_EXEC ); */
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}
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/***********************************************************************
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* DEBUG_IsStepOverInstr
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*
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* Determine if the instruction at CS:EIP is an instruction that
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* we need to step over (like a call or a repetitive string move).
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*/
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static BOOL DEBUG_IsStepOverInstr()
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{
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BYTE *instr = (BYTE *)CTX_SEG_OFF_TO_LIN( &DEBUG_context,
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CS_reg(&DEBUG_context),
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EIP_reg(&DEBUG_context) );
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for (;;)
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{
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switch(*instr)
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{
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/* Skip all prefixes */
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case 0x2e: /* cs: */
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case 0x36: /* ss: */
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case 0x3e: /* ds: */
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case 0x26: /* es: */
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case 0x64: /* fs: */
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case 0x65: /* gs: */
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case 0x66: /* opcode size prefix */
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case 0x67: /* addr size prefix */
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case 0xf0: /* lock */
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case 0xf2: /* repne */
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case 0xf3: /* repe */
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instr++;
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continue;
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/* Handle call instructions */
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case 0xcd: /* int <intno> */
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case 0xe8: /* call <offset> */
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case 0x9a: /* lcall <seg>:<off> */
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return TRUE;
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case 0xff: /* call <regmodrm> */
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return (((instr[1] & 0x38) == 0x10) ||
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((instr[1] & 0x38) == 0x18));
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/* Handle string instructions */
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case 0x6c: /* insb */
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case 0x6d: /* insw */
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case 0x6e: /* outsb */
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case 0x6f: /* outsw */
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case 0xa4: /* movsb */
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case 0xa5: /* movsw */
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case 0xa6: /* cmpsb */
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case 0xa7: /* cmpsw */
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case 0xaa: /* stosb */
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case 0xab: /* stosw */
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case 0xac: /* lodsb */
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case 0xad: /* lodsw */
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case 0xae: /* scasb */
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case 0xaf: /* scasw */
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return TRUE;
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default:
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return FALSE;
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}
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}
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}
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/***********************************************************************
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* DEBUG_IsFctReturn
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*
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* Determine if the instruction at CS:EIP is an instruction that
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* is a function return.
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*/
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BOOL DEBUG_IsFctReturn(void)
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{
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BYTE *instr = (BYTE *)CTX_SEG_OFF_TO_LIN( &DEBUG_context,
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CS_reg(&DEBUG_context),
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EIP_reg(&DEBUG_context) );
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for (;;)
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{
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switch(*instr)
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{
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case 0xc2:
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case 0xc3:
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return TRUE;
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default:
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return FALSE;
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}
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}
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}
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/***********************************************************************
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* DEBUG_SetBreakpoints
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*
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* Set or remove all the breakpoints.
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*/
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void DEBUG_SetBreakpoints( BOOL set )
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{
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int i;
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for (i = 0; i < MAX_BREAKPOINTS; i++)
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{
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if (breakpoints[i].in_use && breakpoints[i].enabled)
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{
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/* Note: we check for read here, because if reading is allowed */
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/* writing permission will be forced in DEBUG_SetOpcode. */
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if (DEBUG_IsBadReadPtr( &breakpoints[i].addr, 1 ))
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{
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fprintf( stderr, "Invalid address for breakpoint %d, disabling it\n", i );
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breakpoints[i].enabled = FALSE;
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}
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else DEBUG_SetOpcode( &breakpoints[i].addr,
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set ? INT3 : breakpoints[i].opcode );
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}
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}
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}
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/***********************************************************************
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* DEBUG_FindBreakpoint
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*
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* Find the breakpoint for a given address. Return the breakpoint
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* number or -1 if none.
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*/
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int DEBUG_FindBreakpoint( const DBG_ADDR *addr )
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{
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int i;
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for (i = 0; i < MAX_BREAKPOINTS; i++)
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{
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if (breakpoints[i].in_use && breakpoints[i].enabled &&
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breakpoints[i].addr.seg == addr->seg &&
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breakpoints[i].addr.off == addr->off) return i;
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}
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return -1;
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}
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/***********************************************************************
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* DEBUG_AddBreakpoint
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*
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* Add a breakpoint.
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*/
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void DEBUG_AddBreakpoint( const DBG_ADDR *address )
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{
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DBG_ADDR addr = *address;
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int num;
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unsigned int seg2;
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BYTE *p;
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DBG_FIX_ADDR_SEG( &addr, CS_reg(&DEBUG_context) );
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if( addr.type != NULL && addr.type == DEBUG_TypeIntConst )
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{
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/*
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* We know that we have the actual offset stored somewhere
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* else in 32-bit space. Grab it, and we
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* should be all set.
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*/
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seg2 = addr.seg;
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addr.seg = 0;
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addr.off = DEBUG_GetExprValue(&addr, NULL);
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addr.seg = seg2;
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}
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if (!DBG_CHECK_READ_PTR( &addr, 1 )) return;
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if (next_bp < MAX_BREAKPOINTS)
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num = next_bp++;
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else /* try to find an empty slot */
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{
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for (num = 1; num < MAX_BREAKPOINTS; num++)
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if (!breakpoints[num].in_use) break;
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if (num >= MAX_BREAKPOINTS)
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{
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fprintf( stderr, "Too many breakpoints. Please delete some.\n" );
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return;
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}
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}
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p = DBG_ADDR_TO_LIN( &addr );
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breakpoints[num].addr = addr;
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breakpoints[num].addrlen = !addr.seg ? 32 :
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(GET_SEL_FLAGS(addr.seg) & LDT_FLAGS_32BIT) ? 32 : 16;
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breakpoints[num].opcode = *p;
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breakpoints[num].enabled = TRUE;
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breakpoints[num].in_use = TRUE;
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breakpoints[num].skipcount = 0;
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fprintf( stderr, "Breakpoint %d at ", num );
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DEBUG_PrintAddress( &breakpoints[num].addr, breakpoints[num].addrlen,
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TRUE );
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fprintf( stderr, "\n" );
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}
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/***********************************************************************
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* DEBUG_DelBreakpoint
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*
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* Delete a breakpoint.
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*/
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void DEBUG_DelBreakpoint( int num )
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{
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if ((num <= 0) || (num >= next_bp) || !breakpoints[num].in_use)
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{
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fprintf( stderr, "Invalid breakpoint number %d\n", num );
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return;
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}
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if( breakpoints[num].condition != NULL )
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{
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DEBUG_FreeExpr(breakpoints[num].condition);
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breakpoints[num].condition = NULL;
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}
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breakpoints[num].enabled = FALSE;
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breakpoints[num].in_use = FALSE;
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breakpoints[num].skipcount = 0;
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}
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/***********************************************************************
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* DEBUG_EnableBreakpoint
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*
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* Enable or disable a break point.
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*/
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void DEBUG_EnableBreakpoint( int num, BOOL enable )
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{
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if ((num <= 0) || (num >= next_bp) || !breakpoints[num].in_use)
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{
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fprintf( stderr, "Invalid breakpoint number %d\n", num );
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return;
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}
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breakpoints[num].enabled = enable;
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breakpoints[num].skipcount = 0;
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}
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/***********************************************************************
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* DEBUG_InfoBreakpoints
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*
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* Display break points information.
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*/
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void DEBUG_InfoBreakpoints(void)
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{
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int i;
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fprintf( stderr, "Breakpoints:\n" );
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for (i = 1; i < next_bp; i++)
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{
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if (breakpoints[i].in_use)
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{
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fprintf( stderr, "%d: %c ", i, breakpoints[i].enabled ? 'y' : 'n');
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DEBUG_PrintAddress( &breakpoints[i].addr, breakpoints[i].addrlen,
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TRUE);
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fprintf( stderr, "\n" );
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if( breakpoints[i].condition != NULL )
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{
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fprintf(stderr, "\t\tstop when ");
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DEBUG_DisplayExpr(breakpoints[i].condition);
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fprintf(stderr, "\n");
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}
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}
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}
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}
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/***********************************************************************
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* DEBUG_AddTaskEntryBreakpoint
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*
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* Add a breakpoint at the entry point of the given task
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*/
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void DEBUG_AddTaskEntryBreakpoint( HTASK16 hTask )
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{
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TDB *pTask = (TDB *)GlobalLock16( hTask );
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NE_MODULE *pModule;
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DBG_ADDR addr = { NULL, 0, 0 };
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if ( pTask )
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{
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if (!(pModule = NE_GetPtr( pTask->hModule ))) return;
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if (pModule->flags & NE_FFLAGS_LIBMODULE) return; /* Library */
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if (pModule->lpDosTask) { /* DOS module */
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addr.seg = pModule->lpDosTask->init_cs | ((DWORD)pModule->self << 16);
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addr.off = pModule->lpDosTask->init_ip;
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fprintf( stderr, "DOS task '%s': ", NE_MODULE_NAME( pModule ) );
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DEBUG_AddBreakpoint( &addr );
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} else
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if (!(pModule->flags & NE_FFLAGS_WIN32)) /* NE module */
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{
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addr.seg =
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GlobalHandleToSel16(NE_SEG_TABLE(pModule)[pModule->cs-1].hSeg);
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addr.off = pModule->ip;
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fprintf( stderr, "Win16 task '%s': ", NE_MODULE_NAME( pModule ) );
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DEBUG_AddBreakpoint( &addr );
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}
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else /* PE module */
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{
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addr.seg = 0;
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addr.off = (DWORD)RVA_PTR( pModule->module32,
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OptionalHeader.AddressOfEntryPoint);
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fprintf( stderr, "Win32 task '%s': ", NE_MODULE_NAME( pModule ) );
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DEBUG_AddBreakpoint( &addr );
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}
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}
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DEBUG_SetBreakpoints( TRUE ); /* Setup breakpoints */
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}
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/***********************************************************************
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* DEBUG_ShouldContinue
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*
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* Determine if we should continue execution after a SIGTRAP signal when
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* executing in the given mode.
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*/
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BOOL DEBUG_ShouldContinue( enum exec_mode mode, int * count )
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{
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DBG_ADDR addr;
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DBG_ADDR cond_addr;
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int bpnum;
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struct list_id list;
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TDB *pTask = (TDB*)GlobalLock16( GetCurrentTask() );
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/* If not single-stepping, back up over the int3 instruction */
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if (!(EFL_reg(&DEBUG_context) & STEP_FLAG)) EIP_reg(&DEBUG_context)--;
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addr.seg = CS_reg(&DEBUG_context);
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addr.off = EIP_reg(&DEBUG_context);
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if (ISV86(&DEBUG_context)) addr.seg |= (DWORD)(pTask?(pTask->hModule):0)<<16; else
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if (IS_SELECTOR_SYSTEM(addr.seg)) addr.seg = 0;
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GlobalUnlock16( GetCurrentTask() );
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bpnum = DEBUG_FindBreakpoint( &addr );
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breakpoints[0].enabled = 0; /* disable the step-over breakpoint */
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if ((bpnum != 0) && (bpnum != -1))
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{
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if( breakpoints[bpnum].condition != NULL )
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{
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cond_addr = DEBUG_EvalExpr(breakpoints[bpnum].condition);
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if( cond_addr.type == NULL )
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{
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/*
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* Something wrong - unable to evaluate this expression.
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*/
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fprintf(stderr, "Unable to evaluate expression ");
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DEBUG_DisplayExpr(breakpoints[bpnum].condition);
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fprintf(stderr, "\nTurning off condition\n");
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DEBUG_AddBPCondition(bpnum, NULL);
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}
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else if( ! DEBUG_GetExprValue( &cond_addr, NULL) )
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{
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return TRUE;
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}
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}
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if( breakpoints[bpnum].skipcount > 0 )
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{
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breakpoints[bpnum].skipcount--;
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if( breakpoints[bpnum].skipcount > 0 )
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{
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return TRUE;
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}
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}
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fprintf( stderr, "Stopped on breakpoint %d at ", bpnum );
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DEBUG_PrintAddress( &breakpoints[bpnum].addr,
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breakpoints[bpnum].addrlen, TRUE );
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fprintf( stderr, "\n" );
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/*
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* See if there is a source file for this bp. If so,
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* then dig it out and display one line.
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*/
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DEBUG_FindNearestSymbol( &addr, TRUE, NULL, 0, &list);
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if( list.sourcefile != NULL )
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{
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DEBUG_List(&list, NULL, 0);
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}
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return FALSE;
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}
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/*
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* If our mode indicates that we are stepping line numbers,
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* get the current function, and figure out if we are exactly
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* on a line number or not.
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*/
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if( mode == EXEC_STEP_OVER
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|| mode == EXEC_STEP_INSTR )
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{
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if( DEBUG_CheckLinenoStatus(&addr) == AT_LINENUMBER )
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{
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(*count)--;
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}
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}
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else if( mode == EXEC_STEPI_OVER
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|| mode == EXEC_STEPI_INSTR )
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{
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(*count)--;
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}
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if( *count > 0 || mode == EXEC_FINISH )
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{
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/*
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* We still need to execute more instructions.
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*/
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return TRUE;
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}
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/*
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* If we are about to stop, then print out the source line if we
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* have it.
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*/
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if( (mode != EXEC_CONT && mode != EXEC_FINISH) )
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{
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DEBUG_FindNearestSymbol( &addr, TRUE, NULL, 0, &list);
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if( list.sourcefile != NULL )
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{
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DEBUG_List(&list, NULL, 0);
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}
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}
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/* If there's no breakpoint and we are not single-stepping, then we */
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/* must have encountered an int3 in the Windows program; let's skip it. */
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if ((bpnum == -1) && !(EFL_reg(&DEBUG_context) & STEP_FLAG))
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EIP_reg(&DEBUG_context)++;
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/* no breakpoint, continue if in continuous mode */
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return (mode == EXEC_CONT || mode == EXEC_FINISH);
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}
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/***********************************************************************
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* DEBUG_RestartExecution
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*
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* Set the breakpoints to the correct state to restart execution
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* in the given mode.
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*/
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enum exec_mode DEBUG_RestartExecution( enum exec_mode mode, int count )
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{
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DBG_ADDR addr;
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DBG_ADDR addr2;
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int bp;
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int delta;
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int status;
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unsigned int * value;
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enum exec_mode ret_mode;
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BYTE *instr;
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TDB *pTask = (TDB*)GlobalLock16( GetCurrentTask() );
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addr.seg = CS_reg(&DEBUG_context);
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addr.off = EIP_reg(&DEBUG_context);
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if (ISV86(&DEBUG_context)) addr.seg |= (DWORD)(pTask?(pTask->hModule):0)<<16; else
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if (IS_SELECTOR_SYSTEM(addr.seg)) addr.seg = 0;
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GlobalUnlock16( GetCurrentTask() );
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/*
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* This is the mode we will be running in after we finish. We would like
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* to be able to modify this in certain cases.
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*/
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ret_mode = mode;
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bp = DEBUG_FindBreakpoint( &addr );
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if ( bp != -1 && bp != 0)
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{
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/*
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* If we have set a new value, then save it in the BP number.
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*/
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if( count != 0 && mode == EXEC_CONT )
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{
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breakpoints[bp].skipcount = count;
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}
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mode = EXEC_STEPI_INSTR; /* If there's a breakpoint, skip it */
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}
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else
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{
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if( mode == EXEC_CONT && count > 1 )
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{
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fprintf(stderr,"Not stopped at any breakpoint; argument ignored.\n");
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}
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}
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|
|
|
if( mode == EXEC_FINISH && DEBUG_IsFctReturn() )
|
|
{
|
|
mode = ret_mode = EXEC_STEPI_INSTR;
|
|
}
|
|
|
|
instr = (BYTE *)CTX_SEG_OFF_TO_LIN( &DEBUG_context,
|
|
CS_reg(&DEBUG_context),
|
|
EIP_reg(&DEBUG_context) );
|
|
/*
|
|
* See if the function we are stepping into has debug info
|
|
* and line numbers. If not, then we step over it instead.
|
|
* FIXME - we need to check for things like thunks or trampolines,
|
|
* as the actual function may in fact have debug info.
|
|
*/
|
|
if( *instr == 0xe8 )
|
|
{
|
|
delta = *(unsigned int*) (instr + 1);
|
|
addr2 = addr;
|
|
DEBUG_Disasm(&addr2, FALSE);
|
|
addr2.off += delta;
|
|
|
|
status = DEBUG_CheckLinenoStatus(&addr2);
|
|
/*
|
|
* Anytime we have a trampoline, step over it.
|
|
*/
|
|
if( ((mode == EXEC_STEP_OVER) || (mode == EXEC_STEPI_OVER))
|
|
&& status == FUNC_IS_TRAMPOLINE )
|
|
{
|
|
#if 0
|
|
fprintf(stderr, "Not stepping into trampoline at %x (no lines)\n",
|
|
addr2.off);
|
|
#endif
|
|
mode = EXEC_STEP_OVER_TRAMPOLINE;
|
|
}
|
|
|
|
if( mode == EXEC_STEP_INSTR && status == FUNC_HAS_NO_LINES )
|
|
{
|
|
#if 0
|
|
fprintf(stderr, "Not stepping into function at %x (no lines)\n",
|
|
addr2.off);
|
|
#endif
|
|
mode = EXEC_STEP_OVER;
|
|
}
|
|
}
|
|
|
|
|
|
if( mode == EXEC_STEP_INSTR )
|
|
{
|
|
if( DEBUG_CheckLinenoStatus(&addr) == FUNC_HAS_NO_LINES )
|
|
{
|
|
fprintf(stderr, "Single stepping until exit from function, \n");
|
|
fprintf(stderr, "which has no line number information.\n");
|
|
|
|
ret_mode = mode = EXEC_FINISH;
|
|
}
|
|
}
|
|
|
|
switch(mode)
|
|
{
|
|
case EXEC_CONT: /* Continuous execution */
|
|
EFL_reg(&DEBUG_context) &= ~STEP_FLAG;
|
|
DEBUG_SetBreakpoints( TRUE );
|
|
break;
|
|
|
|
case EXEC_STEP_OVER_TRAMPOLINE:
|
|
/*
|
|
* This is the means by which we step over our conversion stubs
|
|
* in callfrom*.s and callto*.s. We dig the appropriate address
|
|
* off the stack, and we set the breakpoint there instead of the
|
|
* address just after the call.
|
|
*/
|
|
value = (unsigned int *) ESP_reg(&DEBUG_context) + 2;
|
|
addr.off = *value;
|
|
EFL_reg(&DEBUG_context) &= ~STEP_FLAG;
|
|
breakpoints[0].addr = addr;
|
|
breakpoints[0].enabled = TRUE;
|
|
breakpoints[0].in_use = TRUE;
|
|
breakpoints[0].skipcount = 0;
|
|
breakpoints[0].opcode = *(BYTE *)DBG_ADDR_TO_LIN( &addr );
|
|
DEBUG_SetBreakpoints( TRUE );
|
|
break;
|
|
|
|
case EXEC_FINISH:
|
|
case EXEC_STEPI_OVER: /* Stepping over a call */
|
|
case EXEC_STEP_OVER: /* Stepping over a call */
|
|
if (DEBUG_IsStepOverInstr())
|
|
{
|
|
EFL_reg(&DEBUG_context) &= ~STEP_FLAG;
|
|
DEBUG_Disasm(&addr, FALSE);
|
|
breakpoints[0].addr = addr;
|
|
breakpoints[0].enabled = TRUE;
|
|
breakpoints[0].in_use = TRUE;
|
|
breakpoints[0].skipcount = 0;
|
|
breakpoints[0].opcode = *(BYTE *)DBG_ADDR_TO_LIN( &addr );
|
|
DEBUG_SetBreakpoints( TRUE );
|
|
break;
|
|
}
|
|
/* else fall through to single-stepping */
|
|
|
|
case EXEC_STEP_INSTR: /* Single-stepping an instruction */
|
|
case EXEC_STEPI_INSTR: /* Single-stepping an instruction */
|
|
EFL_reg(&DEBUG_context) |= STEP_FLAG;
|
|
break;
|
|
}
|
|
return ret_mode;
|
|
}
|
|
|
|
int
|
|
DEBUG_AddBPCondition(int num, struct expr * exp)
|
|
{
|
|
if ((num <= 0) || (num >= next_bp) || !breakpoints[num].in_use)
|
|
{
|
|
fprintf( stderr, "Invalid breakpoint number %d\n", num );
|
|
return FALSE;
|
|
}
|
|
|
|
if( breakpoints[num].condition != NULL )
|
|
{
|
|
DEBUG_FreeExpr(breakpoints[num].condition);
|
|
breakpoints[num].condition = NULL;
|
|
}
|
|
|
|
if( exp != NULL )
|
|
{
|
|
breakpoints[num].condition = DEBUG_CloneExpr(exp);
|
|
}
|
|
|
|
return TRUE;
|
|
}
|