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Sweden-Number/debugger/break.c

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/*
* Debugger break-points handling
*
* Copyright 1994 Martin von Loewis
* Copyright 1995 Alexandre Julliard
* Copyright 1999,2000 Eric Pouech
*/
#include "config.h"
#include "debugger.h"
#ifdef __i386__
#define DR7_CONTROL_SHIFT 16
#define DR7_CONTROL_SIZE 4
#define DR7_RW_EXECUTE (0x0)
#define DR7_RW_WRITE (0x1)
#define DR7_RW_READ (0x3)
#define DR7_LEN_1 (0x0)
#define DR7_LEN_2 (0x4)
#define DR7_LEN_4 (0xC)
#define DR7_LOCAL_ENABLE_SHIFT 0
#define DR7_GLOBAL_ENABLE_SHIFT 1
#define DR7_ENABLE_SIZE 2
#define DR7_LOCAL_ENABLE_MASK (0x55)
#define DR7_GLOBAL_ENABLE_MASK (0xAA)
#define DR7_CONTROL_RESERVED (0xFC00)
#define DR7_LOCAL_SLOWDOWN (0x100)
#define DR7_GLOBAL_SLOWDOWN (0x200)
#define DR7_ENABLE_MASK(dr) (1<<(DR7_LOCAL_ENABLE_SHIFT+DR7_ENABLE_SIZE*(dr)))
#define IS_DR7_SET(ctrl,dr) ((ctrl)&DR7_ENABLE_MASK(dr))
#define INT3 0xcc /* int 3 opcode */
#endif
#define MAX_BREAKPOINTS 100
static DBG_BREAKPOINT breakpoints[MAX_BREAKPOINTS];
static int next_bp = 1; /* breakpoint 0 is reserved for step-over */
/***********************************************************************
* DEBUG_IsStepOverInstr
*
* Determine if the instruction at CS:EIP is an instruction that
* we need to step over (like a call or a repetitive string move).
*/
static BOOL DEBUG_IsStepOverInstr(void)
{
#ifdef __i386__
BYTE* instr;
BYTE ch;
DBG_ADDR addr;
addr.seg = DEBUG_context.SegCs;
addr.off = DEBUG_context.Eip;
/* FIXME: old code was using V86BASE(DEBUG_context)
* instead of passing through DOSMEM_MemoryBase
*/
instr = (BYTE*)DEBUG_ToLinear(&addr);
for (;;)
{
if (!DEBUG_READ_MEM(instr, &ch, sizeof(ch)))
return FALSE;
switch (ch)
{
/* Skip all prefixes */
case 0x2e: /* cs: */
case 0x36: /* ss: */
case 0x3e: /* ds: */
case 0x26: /* es: */
case 0x64: /* fs: */
case 0x65: /* gs: */
case 0x66: /* opcode size prefix */
case 0x67: /* addr size prefix */
case 0xf0: /* lock */
case 0xf2: /* repne */
case 0xf3: /* repe */
instr++;
continue;
/* Handle call instructions */
case 0xcd: /* int <intno> */
case 0xe8: /* call <offset> */
case 0x9a: /* lcall <seg>:<off> */
return TRUE;
case 0xff: /* call <regmodrm> */
if (!DEBUG_READ_MEM(instr + 1, &ch, sizeof(ch)))
return FALSE;
return (((ch & 0x38) == 0x10) || ((ch & 0x38) == 0x18));
/* Handle string instructions */
case 0x6c: /* insb */
case 0x6d: /* insw */
case 0x6e: /* outsb */
case 0x6f: /* outsw */
case 0xa4: /* movsb */
case 0xa5: /* movsw */
case 0xa6: /* cmpsb */
case 0xa7: /* cmpsw */
case 0xaa: /* stosb */
case 0xab: /* stosw */
case 0xac: /* lodsb */
case 0xad: /* lodsw */
case 0xae: /* scasb */
case 0xaf: /* scasw */
return TRUE;
default:
return FALSE;
}
}
#else
return FALSE;
#endif
}
/***********************************************************************
* DEBUG_IsFctReturn
*
* Determine if the instruction at CS:EIP is an instruction that
* is a function return.
*/
BOOL DEBUG_IsFctReturn(void)
{
#ifdef __i386__
BYTE* instr;
BYTE ch;
DBG_ADDR addr;
addr.seg = DEBUG_context.SegCs;
addr.off = DEBUG_context.Eip;
/* FIXME: old code was using V86BASE(DEBUG_context)
* instead of passing through DOSMEM_MemoryBase
*/
instr = (BYTE*)DEBUG_ToLinear(&addr);
if (!DEBUG_READ_MEM(instr, &ch, sizeof(ch)))
return FALSE;
return (ch == 0xc2) || (ch == 0xc3);
#else
return FALSE;
#endif
}
/***********************************************************************
* DEBUG_SetBreakpoints
*
* Set or remove all the breakpoints.
*/
void DEBUG_SetBreakpoints( BOOL set )
{
int i;
#ifdef __i386__
DEBUG_context.Dr7 &= ~DR7_LOCAL_ENABLE_MASK;
#endif
for (i = 0; i < next_bp; i++)
{
if (!(breakpoints[i].refcount && breakpoints[i].enabled))
continue;
switch (breakpoints[i].type) {
case DBG_BREAK:
{
#ifdef __i386__
char ch = set ? INT3 : breakpoints[i].u.b.opcode;
if (!DEBUG_WRITE_MEM( (void*)DEBUG_ToLinear(&breakpoints[i].addr),
&ch, sizeof(ch) ))
{
DEBUG_Printf(DBG_CHN_MESG, "Invalid address for breakpoint %d, disabling it\n", i);
breakpoints[i].enabled = FALSE;
}
#endif
}
break;
case DBG_WATCH:
if (set)
{
#ifdef __i386__
DWORD bits;
int reg = breakpoints[i].u.w.reg;
LPDWORD lpdr = NULL;
switch (reg)
{
case 0: lpdr = &DEBUG_context.Dr0; break;
case 1: lpdr = &DEBUG_context.Dr1; break;
case 2: lpdr = &DEBUG_context.Dr2; break;
case 3: lpdr = &DEBUG_context.Dr3; break;
default: RaiseException(DEBUG_STATUS_INTERNAL_ERROR, 0, 0, NULL);
}
*lpdr = DEBUG_ToLinear(&breakpoints[i].addr);
bits = (breakpoints[i].u.w.rw) ? DR7_RW_WRITE : DR7_RW_READ;
switch (breakpoints[i].u.w.len + 1)
{
case 4: bits |= DR7_LEN_4; break;
case 2: bits |= DR7_LEN_2; break;
case 1: bits |= DR7_LEN_1; break;
default: RaiseException(DEBUG_STATUS_INTERNAL_ERROR, 0, 0, NULL);
}
DEBUG_context.Dr7 &= ~(0x0F << (DR7_CONTROL_SHIFT + DR7_CONTROL_SIZE * reg));
DEBUG_context.Dr7 |= bits << (DR7_CONTROL_SHIFT + DR7_CONTROL_SIZE * reg);
DEBUG_context.Dr7 |= DR7_ENABLE_MASK(reg) | DR7_LOCAL_SLOWDOWN;
#endif
}
break;
}
}
}
/***********************************************************************
* DEBUG_FindBreakpoint
*
* Find the breakpoint for a given address. Return the breakpoint
* number or -1 if none.
* If type is DBG_BREAKPOINT, addr is a complete addr
* If type is DBG_WATCHPOINT, only addr.off is meaningful and contains
* linear address
*/
static int DEBUG_FindBreakpoint( const DBG_ADDR *addr, int type )
{
int i;
for (i = 0; i < next_bp; i++)
{
if (breakpoints[i].refcount && breakpoints[i].enabled &&
breakpoints[i].type == type )
{
if ((type == DBG_BREAK &&
breakpoints[i].addr.seg == addr->seg &&
breakpoints[i].addr.off == addr->off) ||
(type == DBG_WATCH &&
DEBUG_ToLinear(&breakpoints[i].addr) == addr->off))
return i;
}
}
return -1;
}
/***********************************************************************
* DEBUG_InitXPoint
*
* Find an empty slot in BP table to add a new break/watch point
*/
static int DEBUG_InitXPoint(int type, DBG_ADDR* addr)
{
int num;
for (num = (next_bp < MAX_BREAKPOINTS) ? next_bp++ : 1;
num < MAX_BREAKPOINTS; num++)
{
if (breakpoints[num].refcount == 0)
{
breakpoints[num].refcount = 1;
breakpoints[num].enabled = TRUE;
breakpoints[num].type = type;
breakpoints[num].skipcount = 0;
breakpoints[num].addr = *addr;
switch (DEBUG_GetSelectorType( addr->seg ))
{
case MODE_32:
breakpoints[num].is32 = 1;
break;
case MODE_VM86:
case MODE_16:
breakpoints[num].is32 = 0;
break;
default:
RaiseException(DEBUG_STATUS_INTERNAL_ERROR, 0, 0, NULL);
}
return num;
}
}
DEBUG_Printf( DBG_CHN_MESG, "Too many breakpoints. Please delete some.\n" );
return -1;
}
/***********************************************************************
* DEBUG_GetWatchedValue
*
* Returns the value watched by watch point 'num'.
*/
static BOOL DEBUG_GetWatchedValue( int num, LPDWORD val )
{
BYTE buf[4];
if (!DEBUG_READ_MEM((void*)DEBUG_ToLinear(&breakpoints[num].addr),
buf, breakpoints[num].u.w.len + 1))
return FALSE;
switch (breakpoints[num].u.w.len + 1)
{
case 4: *val = *(DWORD*)buf; break;
case 2: *val = *(WORD*)buf; break;
case 1: *val = *(BYTE*)buf; break;
default: RaiseException(DEBUG_STATUS_INTERNAL_ERROR, 0, 0, NULL);
}
return TRUE;
}
/***********************************************************************
* DEBUG_AddBreakpoint
*
* Add a breakpoint.
*/
void DEBUG_AddBreakpoint( const DBG_VALUE *_value, BOOL (*func)(void) )
{
DBG_VALUE value = *_value;
int num;
BYTE ch;
if( value.type != NULL && value.type == DEBUG_TypeIntConst )
{
/*
* We know that we have the actual offset stored somewhere
* else in 32-bit space. Grab it, and we
* should be all set.
*/
unsigned int seg2 = value.addr.seg;
value.addr.seg = 0;
value.addr.off = DEBUG_GetExprValue(&value, NULL);
value.addr.seg = seg2;
}
if ((num = DEBUG_FindBreakpoint(&value.addr, DBG_BREAK)) >= 1)
{
breakpoints[num].refcount++;
return;
}
if (!DEBUG_READ_MEM_VERBOSE((void*)DEBUG_ToLinear( &value.addr ), &ch, sizeof(ch)))
{
DEBUG_Printf( DBG_CHN_MESG, "Invalid address, can't set breakpoint\n");
return;
}
if ((num = DEBUG_InitXPoint(DBG_BREAK, &value.addr)) == -1)
return;
breakpoints[num].u.b.opcode = ch;
breakpoints[num].u.b.func = func;
DEBUG_Printf( DBG_CHN_MESG, "Breakpoint %d at ", num );
DEBUG_PrintAddress( &breakpoints[num].addr, breakpoints[num].is32 ? MODE_32 : MODE_16,
TRUE );
DEBUG_Printf( DBG_CHN_MESG, "\n" );
}
/***********************************************************************
* DEBUG_AddBreakpointFromId
*
* Add a breakpoint from a function name (and eventually a line #)
*/
void DEBUG_AddBreakpointFromId(const char *name, int lineno)
{
DBG_VALUE value;
int i;
if (DEBUG_GetSymbolValue(name, lineno, &value, TRUE)) {
DEBUG_AddBreakpoint(&value, NULL);
return;
}
DEBUG_Printf(DBG_CHN_MESG, "Unable to add breakpoint, will check again when a new DLL is loaded\n");
for (i = 0; i < DEBUG_CurrProcess->num_delayed_bp; i++) {
if (!strcmp(name, DEBUG_CurrProcess->delayed_bp[i].name) &&
lineno == DEBUG_CurrProcess->delayed_bp[i].lineno) {
return;
}
}
DEBUG_CurrProcess->delayed_bp = DBG_realloc(DEBUG_CurrProcess->delayed_bp,
sizeof(DBG_DELAYED_BP) * ++DEBUG_CurrProcess->num_delayed_bp);
DEBUG_CurrProcess->delayed_bp[DEBUG_CurrProcess->num_delayed_bp - 1].name = strcpy(DBG_alloc(strlen(name) + 1), name);
DEBUG_CurrProcess->delayed_bp[DEBUG_CurrProcess->num_delayed_bp - 1].lineno = lineno;
}
/***********************************************************************
* DEBUG_AddBreakpointFromLineno
*
* Add a breakpoint from a line number in current file
*/
void DEBUG_AddBreakpointFromLineno(int lineno)
{
DBG_VALUE value;
DEBUG_GetCurrentAddress(&value.addr);
if (lineno != -1) {
struct name_hash* nh;
DEBUG_FindNearestSymbol(&value.addr, TRUE, &nh, 0, NULL);
if (nh == NULL) {
DEBUG_Printf(DBG_CHN_MESG, "Unable to add breakpoint\n");
return;
}
DEBUG_GetLineNumberAddr(nh, lineno, &value.addr, TRUE);
}
value.type = NULL;
value.cookie = DV_TARGET;
DEBUG_AddBreakpoint( &value, NULL );
}
/***********************************************************************
* DEBUG_CheckDelayedBP
*
* Check is a registered delayed BP is now available.
*/
void DEBUG_CheckDelayedBP(void)
{
DBG_VALUE value;
int i = 0;
DBG_DELAYED_BP* dbp = DEBUG_CurrProcess->delayed_bp;
while (i < DEBUG_CurrProcess->num_delayed_bp) {
if (DEBUG_GetSymbolValue(dbp[i].name, dbp[i].lineno, &value, TRUE)) {
DEBUG_AddBreakpoint(&value, NULL);
memmove(&dbp[i], &dbp[i+1], (--DEBUG_CurrProcess->num_delayed_bp - i) * sizeof(*dbp));
} else {
i++;
}
}
}
/***********************************************************************
* DEBUG_AddWatchpoint
*
* Add a watchpoint.
*/
void DEBUG_AddWatchpoint( const DBG_VALUE *_value, BOOL is_write )
{
DBG_VALUE value = *_value;
int num, reg = -1;
unsigned seg2;
DWORD mask = 0;
assert(_value->cookie == DV_TARGET || _value->cookie == DV_HOST);
#ifdef __i386__
DEBUG_FixAddress( &value.addr, DEBUG_context.SegCs );
#endif
if ( value.type != NULL && value.type == DEBUG_TypeIntConst )
{
/*
* We know that we have the actual offset stored somewhere
* else in 32-bit space. Grab it, and we
* should be all set.
*/
seg2 = value.addr.seg;
value.addr.seg = 0;
value.addr.off = DEBUG_GetExprValue(&value, NULL);
value.addr.seg = seg2;
}
for (num = 1; num < next_bp; num++)
{
if (breakpoints[num].refcount && breakpoints[num].enabled &&
breakpoints[num].type == DBG_WATCH) {
mask |= (1 << breakpoints[num].u.w.reg);
}
}
#ifdef __i386__
for (reg = 0; reg < 4 && (mask & (1 << reg)); reg++);
if (reg == 4)
{
DEBUG_Printf(DBG_CHN_MESG, "All i386 hardware watchpoints have been set. Delete some\n");
return;
}
#endif
if ((num = DEBUG_InitXPoint(DBG_WATCH, &value.addr)) == -1)
return;
breakpoints[num].u.w.len = 4 - 1;
if (_value->type && DEBUG_GetObjectSize(_value->type) < 4)
breakpoints[num].u.w.len = 2 - 1;
if (!DEBUG_GetWatchedValue( num, &breakpoints[num].u.w.oldval))
{
DEBUG_Printf(DBG_CHN_MESG, "Bad address. Watchpoint not set\n");
breakpoints[num].refcount = 0;
}
else
{
breakpoints[num].u.w.rw = (is_write) ? TRUE : FALSE;
breakpoints[reg].u.w.reg = reg;
DEBUG_Printf( DBG_CHN_MESG, "Watchpoint %d at ", num );
DEBUG_PrintAddress( &breakpoints[num].addr, breakpoints[num].is32 ? MODE_32 : MODE_16, TRUE );
DEBUG_Printf( DBG_CHN_MESG, "\n" );
}
}
/***********************************************************************
* DEBUG_AddWathpointFromId
*
* Add a watchpoint from a symbol name (and eventually a line #)
*/
void DEBUG_AddWatchpointFromId(const char *name)
{
DBG_VALUE value;
if( DEBUG_GetSymbolValue(name, -1, &value, TRUE) )
DEBUG_AddWatchpoint( &value, 1 );
else
DEBUG_Printf(DBG_CHN_MESG, "Unable to add watchpoint\n");
}
/***********************************************************************
* DEBUG_DelBreakpoint
*
* Delete a breakpoint.
*/
void DEBUG_DelBreakpoint( int num )
{
if ((num <= 0) || (num >= next_bp) || breakpoints[num].refcount == 0)
{
DEBUG_Printf( DBG_CHN_MESG, "Invalid breakpoint number %d\n", num );
return;
}
if (--breakpoints[num].refcount > 0)
return;
if( breakpoints[num].condition != NULL )
{
DEBUG_FreeExpr(breakpoints[num].condition);
breakpoints[num].condition = NULL;
}
breakpoints[num].enabled = FALSE;
breakpoints[num].refcount = 0;
breakpoints[num].skipcount = 0;
}
/***********************************************************************
* DEBUG_EnableBreakpoint
*
* Enable or disable a break point.
*/
void DEBUG_EnableBreakpoint( int num, BOOL enable )
{
if ((num <= 0) || (num >= next_bp) || breakpoints[num].refcount == 0)
{
DEBUG_Printf( DBG_CHN_MESG, "Invalid breakpoint number %d\n", num );
return;
}
breakpoints[num].enabled = (enable) ? TRUE : FALSE;
breakpoints[num].skipcount = 0;
}
/***********************************************************************
* DEBUG_FindTriggeredWatchpoint
*
* Lookup the watchpoints to see if one has been triggered
* Return >= (watch point index) if one is found and *oldval is set to
* the value watched before the TRAP
* Return -1 if none found (*oldval is undetermined)
*
* Unfortunately, Linux does *NOT* (A REAL PITA) report with ptrace
* the DR6 register value, so we have to look with our own need the
* cause of the TRAP.
* -EP
*/
static int DEBUG_FindTriggeredWatchpoint(LPDWORD oldval)
{
int found = -1;
#ifdef __i386__
int i;
/* Method 1 => get triggered watchpoint from context (doesn't work on Linux
* 2.2.x). This should be fixed in >= 2.2.16
*/
for (i = 0; i < next_bp; i++)
{
DWORD val = 0;
if (breakpoints[i].refcount && breakpoints[i].enabled &&
breakpoints[i].type == DBG_WATCH &&
(DEBUG_context.Dr6 & (1 << breakpoints[i].u.w.reg)))
{
DEBUG_context.Dr6 &= ~(1 << breakpoints[i].u.w.reg);
*oldval = breakpoints[i].u.w.oldval;
if (DEBUG_GetWatchedValue(i, &val)) {
breakpoints[i].u.w.oldval = val;
return i;
}
}
}
/* Method 1 failed, trying method 2 */
/* Method 2 => check if value has changed among registered watchpoints
* this really sucks, but this is how gdb 4.18 works on my linux box
* -EP
*/
for (i = 0; i < next_bp; i++)
{
DWORD val = 0;
if (breakpoints[i].refcount && breakpoints[i].enabled &&
breakpoints[i].type == DBG_WATCH &&
DEBUG_GetWatchedValue(i, &val))
{
*oldval = breakpoints[i].u.w.oldval;
if (val != *oldval)
{
DEBUG_context.Dr6 &= ~(1 << breakpoints[i].u.w.reg);
breakpoints[i].u.w.oldval = val;
found = i;
/* cannot break, because two watch points may have been triggered on
* the same access
* only one will be reported to the user (FIXME ?)
*/
}
}
}
#endif
return found;
}
/***********************************************************************
* DEBUG_InfoBreakpoints
*
* Display break points information.
*/
void DEBUG_InfoBreakpoints(void)
{
int i;
DEBUG_Printf( DBG_CHN_MESG, "Breakpoints:\n" );
for (i = 1; i < next_bp; i++)
{
if (breakpoints[i].refcount && breakpoints[i].type == DBG_BREAK)
{
DEBUG_Printf( DBG_CHN_MESG, "%d: %c ", i, breakpoints[i].enabled ? 'y' : 'n');
DEBUG_PrintAddress( &breakpoints[i].addr,
breakpoints[i].is32 ? MODE_32 : MODE_16, TRUE);
DEBUG_Printf( DBG_CHN_MESG, " (%u)\n", breakpoints[i].refcount );
if( breakpoints[i].condition != NULL )
{
DEBUG_Printf(DBG_CHN_MESG, "\t\tstop when ");
DEBUG_DisplayExpr(breakpoints[i].condition);
DEBUG_Printf(DBG_CHN_MESG, "\n");
}
}
}
DEBUG_Printf( DBG_CHN_MESG, "Watchpoints:\n" );
for (i = 1; i < next_bp; i++)
{
if (breakpoints[i].refcount && breakpoints[i].type == DBG_WATCH)
{
DEBUG_Printf( DBG_CHN_MESG, "%d: %c ", i, breakpoints[i].enabled ? 'y' : 'n');
DEBUG_PrintAddress( &breakpoints[i].addr,
breakpoints[i].is32 ? MODE_32 : MODE_16, TRUE);
DEBUG_Printf( DBG_CHN_MESG, " on %d byte%s (%c)\n",
breakpoints[i].u.w.len + 1,
breakpoints[i].u.w.len > 0 ? "s" : "",
breakpoints[i].u.w.rw ? 'W' : 'R');
if( breakpoints[i].condition != NULL )
{
DEBUG_Printf(DBG_CHN_MESG, "\t\tstop when ");
DEBUG_DisplayExpr(breakpoints[i].condition);
DEBUG_Printf(DBG_CHN_MESG, "\n");
}
}
}
}
/***********************************************************************
* DEBUG_ShallBreak
*
* Check whether or not the condition (bp / skipcount) of a break/watch
* point are met.
*/
static BOOL DEBUG_ShallBreak( int bpnum )
{
if ( breakpoints[bpnum].condition != NULL )
{
DBG_VALUE value = DEBUG_EvalExpr(breakpoints[bpnum].condition);
if ( value.type == NULL )
{
/*
* Something wrong - unable to evaluate this expression.
*/
DEBUG_Printf(DBG_CHN_MESG, "Unable to evaluate expression ");
DEBUG_DisplayExpr(breakpoints[bpnum].condition);
DEBUG_Printf(DBG_CHN_MESG, "\nTurning off condition\n");
DEBUG_AddBPCondition(bpnum, NULL);
}
else if( !DEBUG_GetExprValue( &value, NULL) )
{
return FALSE;
}
}
if ( breakpoints[bpnum].skipcount > 0 && --breakpoints[bpnum].skipcount > 0 )
return FALSE;
if ((breakpoints[bpnum].type == DBG_BREAK) && breakpoints[bpnum].u.b.func)
return breakpoints[bpnum].u.b.func();
return TRUE;
}
/***********************************************************************
* DEBUG_ShouldContinue
*
* Determine if we should continue execution after a SIGTRAP signal when
* executing in the given mode.
*/
BOOL DEBUG_ShouldContinue( DBG_ADDR *addr, DWORD code, enum exec_mode mode, int * count )
{
int bpnum;
DWORD oldval;
int wpnum;
enum dbg_mode addr_mode;
struct symbol_info syminfo;
#ifdef __i386__
/* If not single-stepping, back up over the int3 instruction */
if (code == EXCEPTION_BREAKPOINT)
{
DEBUG_context.Eip--;
addr->off--;
}
#endif
bpnum = DEBUG_FindBreakpoint( addr, DBG_BREAK );
breakpoints[0].enabled = FALSE; /* disable the step-over breakpoint */
if ((bpnum != 0) && (bpnum != -1))
{
if (!DEBUG_ShallBreak(bpnum)) return TRUE;
DEBUG_Printf( DBG_CHN_MESG, "Stopped on breakpoint %d at ", bpnum );
syminfo = DEBUG_PrintAddress( &breakpoints[bpnum].addr,
breakpoints[bpnum].is32 ? MODE_32 : MODE_16, TRUE );
DEBUG_Printf( DBG_CHN_MESG, "\n" );
if( syminfo.list.sourcefile != NULL )
DEBUG_List(&syminfo.list, NULL, 0);
return FALSE;
}
wpnum = DEBUG_FindTriggeredWatchpoint(&oldval);
if ((wpnum != 0) && (wpnum != -1))
{
/* If not single-stepping, do not back up over the int3 instruction */
if (code == EXCEPTION_BREAKPOINT)
{
#ifdef __i386__
DEBUG_context.Eip++;
addr->off++;
#endif
}
if (!DEBUG_ShallBreak(wpnum)) return TRUE;
addr_mode = DEBUG_GetSelectorType( addr->seg );
DEBUG_Printf(DBG_CHN_MESG, "Stopped on watchpoint %d at ", wpnum);
syminfo = DEBUG_PrintAddress( addr, addr_mode, TRUE );
DEBUG_Printf(DBG_CHN_MESG, " values: old=%lu new=%lu\n",
oldval, breakpoints[wpnum].u.w.oldval);
if (syminfo.list.sourcefile != NULL)
DEBUG_List(&syminfo.list, NULL, 0);
return FALSE;
}
/*
* If our mode indicates that we are stepping line numbers,
* get the current function, and figure out if we are exactly
* on a line number or not.
*/
if( mode == EXEC_STEP_OVER || mode == EXEC_STEP_INSTR )
{
if( DEBUG_CheckLinenoStatus(addr) == AT_LINENUMBER )
{
(*count)--;
}
}
else if( mode == EXEC_STEPI_OVER || mode == EXEC_STEPI_INSTR )
{
(*count)--;
}
if( *count > 0 || mode == EXEC_FINISH )
{
/*
* We still need to execute more instructions.
*/
return TRUE;
}
/*
* If we are about to stop, then print out the source line if we
* have it.
*/
if (mode != EXEC_CONT && mode != EXEC_PASS && mode != EXEC_FINISH)
{
DEBUG_FindNearestSymbol( addr, TRUE, NULL, 0, &syminfo.list);
if( syminfo.list.sourcefile != NULL )
{
DEBUG_List(&syminfo.list, NULL, 0);
}
}
#ifdef __i386__
/* If there's no breakpoint and we are not single-stepping, then we */
/* must have encountered an int3 in the Windows program; let's skip it. */
if ((bpnum == -1) && code == EXCEPTION_BREAKPOINT)
{
DEBUG_context.Eip++;
addr->off++;
}
#endif
/* no breakpoint, continue if in continuous mode */
return (mode == EXEC_CONT || mode == EXEC_PASS || mode == EXEC_FINISH);
}
/***********************************************************************
* DEBUG_SuspendExecution
*
* Remove all breakpoints before entering the debug loop
*/
void DEBUG_SuspendExecution( void )
{
DEBUG_SetBreakpoints( FALSE );
breakpoints[0] = DEBUG_CurrThread->stepOverBP;
}
/***********************************************************************
* DEBUG_RestartExecution
*
* Set the breakpoints to the correct state to restart execution
* in the given mode.
*/
enum exec_mode DEBUG_RestartExecution( enum exec_mode mode, int count )
{
DBG_ADDR addr;
DBG_ADDR addr2;
int bp;
int delta;
int status;
enum exec_mode ret_mode;
DWORD instr;
unsigned char ch;
DEBUG_GetCurrentAddress( &addr );
/*
* This is the mode we will be running in after we finish. We would like
* to be able to modify this in certain cases.
*/
ret_mode = mode;
bp = DEBUG_FindBreakpoint( &addr, DBG_BREAK );
if ( bp != -1 && bp != 0)
{
/*
* If we have set a new value, then save it in the BP number.
*/
if( count != 0 && mode == EXEC_CONT )
{
breakpoints[bp].skipcount = count;
}
mode = EXEC_STEPI_INSTR; /* If there's a breakpoint, skip it */
}
else
{
if( mode == EXEC_CONT && count > 1 )
{
DEBUG_Printf(DBG_CHN_MESG, "Not stopped at any breakpoint; argument ignored.\n");
}
}
if( mode == EXEC_FINISH && DEBUG_IsFctReturn() )
{
mode = ret_mode = EXEC_STEPI_INSTR;
}
instr = DEBUG_ToLinear( &addr );
DEBUG_READ_MEM((void*)instr, &ch, sizeof(ch));
/*
* 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 ( ch == 0xe8 )
{
DEBUG_READ_MEM((void*)(instr + 1), &delta, sizeof(delta));
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
DEBUG_Printf(DBG_CHN_MESG, "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
DEBUG_Printf(DBG_CHN_MESG, "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 )
{
DEBUG_Printf(DBG_CHN_MESG, "Single stepping until exit from function, \n");
DEBUG_Printf(DBG_CHN_MESG, "which has no line number information.\n");
ret_mode = mode = EXEC_FINISH;
}
}
switch(mode)
{
case EXEC_CONT: /* Continuous execution */
case EXEC_PASS: /* Continue, passing exception */
#ifdef __i386__
DEBUG_context.EFlags &= ~STEP_FLAG;
#endif
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.
*/
#ifdef __i386__
DEBUG_READ_MEM((void*)(DEBUG_context.Esp +
2 * sizeof(unsigned int)),
&addr.off, sizeof(addr.off));
DEBUG_context.EFlags &= ~STEP_FLAG;
#endif
breakpoints[0].addr = addr;
breakpoints[0].enabled = TRUE;
breakpoints[0].refcount = 1;
breakpoints[0].skipcount = 0;
DEBUG_READ_MEM((void*)DEBUG_ToLinear( &addr ), &breakpoints[0].u.b.opcode,
sizeof(char));
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())
{
#ifdef __i386__
DEBUG_context.EFlags &= ~STEP_FLAG;
#endif
DEBUG_Disasm(&addr, FALSE);
breakpoints[0].addr = addr;
breakpoints[0].enabled = TRUE;
breakpoints[0].refcount = 1;
breakpoints[0].skipcount = 0;
DEBUG_READ_MEM((void*)DEBUG_ToLinear( &addr ), &breakpoints[0].u.b.opcode,
sizeof(char));
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 */
#ifdef __i386__
DEBUG_context.EFlags |= STEP_FLAG;
#endif
break;
default:
RaiseException(DEBUG_STATUS_INTERNAL_ERROR, 0, 0, NULL);
}
DEBUG_CurrThread->stepOverBP = breakpoints[0];
return ret_mode;
}
int
DEBUG_AddBPCondition(int num, struct expr * exp)
{
if ((num <= 0) || (num >= next_bp) || !breakpoints[num].refcount)
{
DEBUG_Printf( DBG_CHN_MESG, "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;
}
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