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wine/programs/winedbg/break.c
Eric Pouech 6ab9b23526 winedbg: Hardware breakpoints 
- implemented hardware assisted breakpoints (new 'hbreak' command
  which behaves just as 'break' command)
- small improvements to break handling (saving hit xpoint across
  exception handling)
- fixed 'cont N' command for watchpoints
2006-01-27 16:17:22 +01:00

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/*
* Debugger break-points handling
*
* Copyright 1994 Martin von Loewis
* Copyright 1995 Alexandre Julliard
* Copyright 1999,2000 Eric Pouech
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include "debugger.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(winedbg);
static int is_xpoint_break(int bpnum)
{
int type = dbg_curr_process->bp[bpnum].xpoint_type;
if (type == be_xpoint_break || type == be_xpoint_watch_exec) return TRUE;
if (type == be_xpoint_watch_read || type == be_xpoint_watch_write) return FALSE;
RaiseException(DEBUG_STATUS_INTERNAL_ERROR, 0, 0, NULL);
return 0; /* never reached */
}
/***********************************************************************
* break_set_xpoints
*
* Set or remove all the breakpoints & watchpoints
*/
void break_set_xpoints(BOOL set)
{
static BOOL last; /* = 0 = FALSE */
unsigned int i, ret, size;
void* addr;
struct dbg_breakpoint* bp = dbg_curr_process->bp;
if (set == last) return;
last = set;
for (i = 0; i < dbg_curr_process->next_bp; i++)
{
if (!bp[i].refcount || !bp[i].enabled) continue;
if (is_xpoint_break(i))
size = 0;
else
size = bp[i].w.len + 1;
addr = (void*)memory_to_linear_addr(&bp[i].addr);
if (set)
ret = be_cpu->insert_Xpoint(dbg_curr_process->handle,
dbg_curr_process->process_io,
&dbg_context, bp[i].xpoint_type, addr,
&bp[i].info, size);
else
ret = be_cpu->remove_Xpoint(dbg_curr_process->handle,
dbg_curr_process->process_io,
&dbg_context, bp[i].xpoint_type, addr,
bp[i].info, size);
if (!ret)
{
dbg_printf("Invalid address (");
print_address(&bp[i].addr, FALSE);
dbg_printf(") for breakpoint %d, disabling it\n", i);
bp[i].enabled = FALSE;
}
}
}
/***********************************************************************
* find_xpoint
*
* Find the breakpoint for a given address. Return the breakpoint
* number or -1 if none.
*/
static int find_xpoint(const ADDRESS* addr, enum be_xpoint_type type)
{
int i;
void* lin = memory_to_linear_addr(addr);
struct dbg_breakpoint* bp = dbg_curr_process->bp;
for (i = 0; i < dbg_curr_process->next_bp; i++)
{
if (bp[i].refcount && bp[i].enabled && bp[i].xpoint_type == type &&
memory_to_linear_addr(&bp[i].addr) == lin)
return i;
}
return -1;
}
/***********************************************************************
* init_xpoint
*
* Find an empty slot in BP table to add a new break/watch point
*/
static int init_xpoint(int type, const ADDRESS* addr)
{
int num;
struct dbg_breakpoint* bp = dbg_curr_process->bp;
for (num = (dbg_curr_process->next_bp < MAX_BREAKPOINTS) ?
dbg_curr_process->next_bp++ : 1;
num < MAX_BREAKPOINTS; num++)
{
if (bp[num].refcount == 0)
{
bp[num].refcount = 1;
bp[num].enabled = TRUE;
bp[num].xpoint_type = type;
bp[num].skipcount = 0;
bp[num].addr = *addr;
return num;
}
}
dbg_printf("Too many bp. Please delete some.\n");
return -1;
}
/***********************************************************************
* get_watched_value
*
* Returns the value watched by watch point 'num'.
*/
static BOOL get_watched_value(int num, LPDWORD val)
{
BYTE buf[4];
if (!dbg_read_memory(memory_to_linear_addr(&dbg_curr_process->bp[num].addr),
buf, dbg_curr_process->bp[num].w.len + 1))
return FALSE;
switch (dbg_curr_process->bp[num].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;
}
/***********************************************************************
* break_add_break
*
* Add a breakpoint.
*/
BOOL break_add_break(const ADDRESS* addr, BOOL verbose, BOOL swbp)
{
int num;
BYTE ch;
struct dbg_breakpoint* bp = dbg_curr_process->bp;
int type = swbp ? be_xpoint_break : be_xpoint_watch_exec;
if ((num = find_xpoint(addr, type)) >= 1)
{
bp[num].refcount++;
dbg_printf("Breakpoint %d at ", num);
print_address(&bp[num].addr, TRUE);
dbg_printf(" (refcount=%d)\n", bp[num].refcount);
return TRUE;
}
if (!dbg_read_memory(memory_to_linear_addr(addr), &ch, sizeof(ch)))
{
if (verbose)
{
dbg_printf("Invalid address ");
print_bare_address(addr);
dbg_printf(", can't set breakpoint\n");
}
return FALSE;
}
if ((num = init_xpoint(type, addr)) == -1)
return FALSE;
dbg_printf("Breakpoint %d at ", num);
print_address(&bp[num].addr, TRUE);
dbg_printf("\n");
return TRUE;
}
/***********************************************************************
* break_add_break_from_lvalue
*
* Add a breakpoint.
*/
BOOL break_add_break_from_lvalue(const struct dbg_lvalue* lvalue, BOOL swbp)
{
ADDRESS addr;
types_extract_as_address(lvalue, &addr);
if (!break_add_break(&addr, TRUE, swbp))
{
if (!DBG_IVAR(CanDeferOnBPByAddr))
{
dbg_printf("Invalid address, can't set breakpoint\n"
"You can turn on deferring bp by address by setting $CanDeferOnBPByAddr to 1\n");
return FALSE;
}
dbg_printf("Unable to add breakpoint, will check again any time a new DLL is loaded\n");
dbg_curr_process->delayed_bp =
dbg_heap_realloc(dbg_curr_process->delayed_bp,
sizeof(struct dbg_delayed_bp) * ++dbg_curr_process->num_delayed_bp);
dbg_curr_process->delayed_bp[dbg_curr_process->num_delayed_bp - 1].is_symbol = FALSE;
dbg_curr_process->delayed_bp[dbg_curr_process->num_delayed_bp - 1].software_bp = swbp;
dbg_curr_process->delayed_bp[dbg_curr_process->num_delayed_bp - 1].u.addr = addr;
return TRUE;
}
return FALSE;
}
/***********************************************************************
* break_add_break_from_id
*
* Add a breakpoint from a function name (and eventually a line #)
*/
void break_add_break_from_id(const char *name, int lineno, BOOL swbp)
{
struct dbg_lvalue lvalue;
int i;
switch (symbol_get_lvalue(name, lineno, &lvalue, TRUE))
{
case sglv_found:
break_add_break(&lvalue.addr, TRUE, swbp);
return;
case sglv_unknown:
break;
case sglv_aborted: /* user aborted symbol lookup */
return;
}
dbg_printf("Unable to add breakpoint, will check again when a new DLL is loaded\n");
for (i = 0; i < dbg_curr_process->num_delayed_bp; i++)
{
if (dbg_curr_process->delayed_bp[i].is_symbol &&
!strcmp(name, dbg_curr_process->delayed_bp[i].u.symbol.name) &&
lineno == dbg_curr_process->delayed_bp[i].u.symbol.lineno)
return;
}
dbg_curr_process->delayed_bp = dbg_heap_realloc(dbg_curr_process->delayed_bp,
sizeof(struct dbg_delayed_bp) * ++dbg_curr_process->num_delayed_bp);
dbg_curr_process->delayed_bp[dbg_curr_process->num_delayed_bp - 1].is_symbol = TRUE;
dbg_curr_process->delayed_bp[dbg_curr_process->num_delayed_bp - 1].software_bp = swbp;
dbg_curr_process->delayed_bp[dbg_curr_process->num_delayed_bp - 1].u.symbol.name = strcpy(HeapAlloc(GetProcessHeap(), 0, strlen(name) + 1), name);
dbg_curr_process->delayed_bp[dbg_curr_process->num_delayed_bp - 1].u.symbol.lineno = lineno;
}
struct cb_break_lineno
{
int lineno;
ADDRESS addr;
};
static BOOL CALLBACK line_cb(SRCCODEINFO* sci, void* user)
{
struct cb_break_lineno* bkln = user;
if (bkln->lineno == sci->LineNumber)
{
bkln->addr.Mode = AddrModeFlat;
bkln->addr.Offset = sci->Address;
return FALSE;
}
return TRUE;
}
/***********************************************************************
* break_add_break_from_lineno
*
* Add a breakpoint from a line number in current file
*/
void break_add_break_from_lineno(int lineno, BOOL swbp)
{
struct cb_break_lineno bkln;
memory_get_current_pc(&bkln.addr);
if (lineno != -1)
{
IMAGEHLP_LINE il;
DWORD disp;
DWORD linear = (DWORD)memory_to_linear_addr(&bkln.addr);
il.SizeOfStruct = sizeof(il);
if (!SymGetLineFromAddr(dbg_curr_process->handle, linear, &disp, &il))
{
dbg_printf("Unable to add breakpoint (unknown address %lx)\n", linear);
return;
}
bkln.addr.Offset = 0;
bkln.lineno = lineno;
SymEnumLines(dbg_curr_process->handle, linear, NULL, il.FileName, line_cb, &bkln);
if (!bkln.addr.Offset)
{
dbg_printf("Unknown line number\n"
"(either out of file, or no code at given line number)\n");
return;
}
}
break_add_break(&bkln.addr, TRUE, swbp);
}
/***********************************************************************
* break_check_delayed_bp
*
* Check is a registered delayed BP is now available.
*/
void break_check_delayed_bp(void)
{
struct dbg_lvalue lvalue;
int i;
struct dbg_delayed_bp* dbp = dbg_curr_process->delayed_bp;
for (i = 0; i < dbg_curr_process->num_delayed_bp; i++)
{
if (dbp[i].is_symbol)
{
if (symbol_get_lvalue(dbp[i].u.symbol.name, dbp[i].u.symbol.lineno,
&lvalue, TRUE) != sglv_found)
continue;
if (lvalue.cookie != DLV_TARGET) continue;
}
else
lvalue.addr = dbp[i].u.addr;
WINE_TRACE("trying to add delayed %s-bp\n", dbp[i].is_symbol ? "S" : "A");
if (!dbp[i].is_symbol)
WINE_TRACE("\t%04x:%08lx\n",
dbp[i].u.addr.Segment, dbp[i].u.addr.Offset);
else
WINE_TRACE("\t'%s' @ %d\n",
dbp[i].u.symbol.name, dbp[i].u.symbol.lineno);
if (break_add_break(&lvalue.addr, FALSE, dbp[i].software_bp))
memmove(&dbp[i], &dbp[i+1], (--dbg_curr_process->num_delayed_bp - i) * sizeof(*dbp));
}
}
/***********************************************************************
* break_add_watch
*
* Add a watchpoint.
*/
static void break_add_watch(const struct dbg_lvalue* lvalue, BOOL is_write)
{
int num;
DWORD64 l = 4;
num = init_xpoint((is_write) ? be_xpoint_watch_write : be_xpoint_watch_read,
&lvalue->addr);
if (num == -1) return;
if (lvalue->type.id != dbg_itype_none)
{
if (types_get_info(&lvalue->type, TI_GET_LENGTH, &l))
{
switch (l)
{
case 4: case 2: case 1: break;
default:
dbg_printf("Unsupported length (%s) for watch-points, defaulting to 4\n",
wine_dbgstr_longlong(l));
break;
}
}
else dbg_printf("Cannot get watch size, defaulting to 4\n");
}
dbg_curr_process->bp[num].w.len = (DWORD)l - 1;
if (!get_watched_value(num, &dbg_curr_process->bp[num].w.oldval))
{
dbg_printf("Bad address. Watchpoint not set\n");
dbg_curr_process->bp[num].refcount = 0;
return;
}
dbg_printf("Watchpoint %d at ", num);
print_address(&dbg_curr_process->bp[num].addr, TRUE);
dbg_printf("\n");
}
/******************************************************************
* break_add_watch_from_lvalue
*
* Adds a watch point from an address (stored in a lvalue)
*/
void break_add_watch_from_lvalue(const struct dbg_lvalue* lvalue)
{
struct dbg_lvalue lval;
types_extract_as_address(lvalue, &lval.addr);
lval.type.id = dbg_itype_none;
break_add_watch(&lval, TRUE);
}
/***********************************************************************
* break_add_watch_from_id
*
* Add a watchpoint from a symbol name
*/
void break_add_watch_from_id(const char *name)
{
struct dbg_lvalue lvalue;
switch (symbol_get_lvalue(name, -1, &lvalue, TRUE))
{
case sglv_found:
break_add_watch(&lvalue, 1);
break;
case sglv_unknown:
dbg_printf("Unable to add watchpoint\n");
break;
case sglv_aborted: /* user aborted symbol lookup */
break;
}
}
/***********************************************************************
* break_delete_xpoint
*
* Delete a breakpoint.
*/
void break_delete_xpoint(int num)
{
struct dbg_breakpoint* bp = dbg_curr_process->bp;
if ((num <= 0) || (num >= dbg_curr_process->next_bp) ||
bp[num].refcount == 0)
{
dbg_printf("Invalid breakpoint number %d\n", num);
return;
}
if (--bp[num].refcount > 0)
return;
if (bp[num].condition != NULL)
{
expr_free(bp[num].condition);
bp[num].condition = NULL;
}
bp[num].enabled = FALSE;
bp[num].refcount = 0;
bp[num].skipcount = 0;
}
static inline BOOL module_is_container(const IMAGEHLP_MODULE* wmod_cntnr,
const IMAGEHLP_MODULE* wmod_child)
{
return wmod_cntnr->BaseOfImage <= wmod_child->BaseOfImage &&
(DWORD)wmod_cntnr->BaseOfImage + wmod_cntnr->ImageSize >=
(DWORD)wmod_child->BaseOfImage + wmod_child->ImageSize;
}
/******************************************************************
* break_delete_xpoints_from_module
*
* Remove all Xpoints from module which base is 'base'
*/
void break_delete_xpoints_from_module(unsigned long base)
{
IMAGEHLP_MODULE im, im_elf;
int i;
DWORD linear;
struct dbg_breakpoint* bp = dbg_curr_process->bp;
/* FIXME: should do it also on the ELF sibbling if any */
im.SizeOfStruct = sizeof(im);
im_elf.SizeOfStruct = sizeof(im_elf);
if (!SymGetModuleInfo(dbg_curr_process->handle, base, &im)) return;
/* try to get in fact the underlying ELF module (if any) */
if (SymGetModuleInfo(dbg_curr_process->handle, im.BaseOfImage - 1, &im_elf) &&
im_elf.BaseOfImage <= im.BaseOfImage &&
(DWORD)im_elf.BaseOfImage + im_elf.ImageSize >= (DWORD)im.BaseOfImage + im.ImageSize)
im = im_elf;
for (i = 0; i < dbg_curr_process->next_bp; i++)
{
linear = (DWORD)memory_to_linear_addr(&bp[i].addr);
if (bp[i].refcount && bp[i].enabled &&
im.BaseOfImage <= linear && linear < im.BaseOfImage + im.ImageSize)
{
break_delete_xpoint(i);
}
}
}
/***********************************************************************
* break_enable_xpoint
*
* Enable or disable a break point.
*/
void break_enable_xpoint(int num, BOOL enable)
{
if ((num <= 0) || (num >= dbg_curr_process->next_bp) ||
dbg_curr_process->bp[num].refcount == 0)
{
dbg_printf("Invalid breakpoint number %d\n", num);
return;
}
dbg_curr_process->bp[num].enabled = (enable) ? TRUE : FALSE;
dbg_curr_process->bp[num].skipcount = 0;
}
/***********************************************************************
* find_triggered_watch
*
* 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 find_triggered_watch(LPDWORD oldval)
{
int found = -1;
int i;
struct dbg_breakpoint* bp = dbg_curr_process->bp;
/* 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 < dbg_curr_process->next_bp; i++)
{
DWORD val = 0;
if (bp[i].refcount && bp[i].enabled && !is_xpoint_break(i) &&
(be_cpu->is_watchpoint_set(&dbg_context, bp[i].info)))
{
be_cpu->clear_watchpoint(&dbg_context, bp[i].info);
*oldval = bp[i].w.oldval;
if (get_watched_value(i, &val))
{
bp[i].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 < dbg_curr_process->next_bp; i++)
{
DWORD val = 0;
if (bp[i].refcount && bp[i].enabled && !is_xpoint_break(i) &&
get_watched_value(i, &val))
{
*oldval = bp[i].w.oldval;
if (val != *oldval)
{
be_cpu->clear_watchpoint(&dbg_context, bp[i].info);
bp[i].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 ?)
*/
}
}
}
return found;
}
/***********************************************************************
* break_info
*
* Display break & watch points information.
*/
void break_info(void)
{
int i;
int nbp = 0, nwp = 0;
struct dbg_delayed_bp* dbp = dbg_curr_process->delayed_bp;
struct dbg_breakpoint* bp = dbg_curr_process->bp;
for (i = 1; i < dbg_curr_process->next_bp; i++)
{
if (bp[i].refcount)
{
if (is_xpoint_break(i)) nbp++; else nwp++;
}
}
if (nbp)
{
dbg_printf("Breakpoints:\n");
for (i = 1; i < dbg_curr_process->next_bp; i++)
{
if (!bp[i].refcount || !is_xpoint_break(i))
continue;
dbg_printf("%d: %c ", i, bp[i].enabled ? 'y' : 'n');
print_address(&bp[i].addr, TRUE);
dbg_printf(" (%u)%s\n", bp[i].refcount,
bp[i].xpoint_type == be_xpoint_watch_exec ? " (hardware assisted)" : "");
if (bp[i].condition != NULL)
{
dbg_printf("\t\tstop when ");
expr_print(bp[i].condition);
dbg_printf("\n");
}
}
}
else dbg_printf("No breakpoints\n");
if (nwp)
{
dbg_printf("Watchpoints:\n");
for (i = 1; i < dbg_curr_process->next_bp; i++)
{
if (!bp[i].refcount || is_xpoint_break(i))
continue;
dbg_printf("%d: %c ", i, bp[i].enabled ? 'y' : 'n');
print_address(&bp[i].addr, TRUE);
dbg_printf(" on %d byte%s (%c)\n",
bp[i].w.len + 1, bp[i].w.len > 0 ? "s" : "",
bp[i].xpoint_type == be_xpoint_watch_write ? 'W' : 'R');
if (bp[i].condition != NULL)
{
dbg_printf("\t\tstop when ");
expr_print(bp[i].condition);
dbg_printf("\n");
}
}
}
else dbg_printf("No watchpoints\n");
if (dbg_curr_process->num_delayed_bp)
{
dbg_printf("Delayed breakpoints:\n");
for (i = 0; i < dbg_curr_process->num_delayed_bp; i++)
{
if (dbp[i].is_symbol)
{
dbg_printf("%d: %s", i, dbp[i].u.symbol.name);
if (dbp[i].u.symbol.lineno != -1)
dbg_printf(" at line %u", dbp[i].u.symbol.lineno);
}
else
{
dbg_printf("%d: ", i);
print_address(&dbp[i].u.addr, FALSE);
}
dbg_printf("\n");
}
}
}
/***********************************************************************
* should_stop
*
* Check whether or not the condition (bp / skipcount) of a break/watch
* point are met.
*/
static BOOL should_stop(int bpnum)
{
struct dbg_breakpoint* bp = &dbg_curr_process->bp[bpnum];
if (bp->condition != NULL)
{
struct dbg_lvalue lvalue = expr_eval(bp->condition);
if (lvalue.type.id == dbg_itype_none)
{
/*
* Something wrong - unable to evaluate this expression.
*/
dbg_printf("Unable to evaluate expression ");
expr_print(bp->condition);
dbg_printf("\nTurning off condition\n");
break_add_condition(bpnum, NULL);
}
else if (!types_extract_as_integer(&lvalue))
{
return FALSE;
}
}
if (bp->skipcount > 0) bp->skipcount--;
return bp->skipcount == 0;
}
/***********************************************************************
* break_should_continue
*
* Determine if we should continue execution after a SIGTRAP signal when
* executing in the given mode.
*/
BOOL break_should_continue(ADDRESS* addr, DWORD code, int* count, BOOL* is_break)
{
DWORD oldval = 0;
enum dbg_exec_mode mode = dbg_curr_thread->exec_mode;
*is_break = FALSE;
/* If not single-stepping, back up to the break instruction */
if (code == EXCEPTION_BREAKPOINT)
addr->Offset += be_cpu->adjust_pc_for_break(&dbg_context, TRUE);
dbg_curr_process->bp[0].enabled = FALSE; /* disable the step-over breakpoint */
dbg_curr_thread->stopped_xpoint = find_xpoint(addr, be_xpoint_break);
if (dbg_curr_thread->stopped_xpoint > 0)
{
if (!should_stop(dbg_curr_thread->stopped_xpoint)) return TRUE;
dbg_printf("Stopped on breakpoint %d at ", dbg_curr_thread->stopped_xpoint);
print_address(&dbg_curr_process->bp[dbg_curr_thread->stopped_xpoint].addr, TRUE);
dbg_printf("\n");
return FALSE;
}
dbg_curr_thread->stopped_xpoint = find_xpoint(addr, be_xpoint_watch_exec);
if (dbg_curr_thread->stopped_xpoint > 0)
{
/* If not single-stepping, do not back up over the break instruction */
if (code == EXCEPTION_BREAKPOINT)
addr->Offset += be_cpu->adjust_pc_for_break(&dbg_context, FALSE);
if (!should_stop(dbg_curr_thread->stopped_xpoint)) return TRUE;
dbg_printf("Stopped on breakpoint %d at ", dbg_curr_thread->stopped_xpoint);
print_address(&dbg_curr_process->bp[dbg_curr_thread->stopped_xpoint].addr, TRUE);
dbg_printf("\n");
return FALSE;
}
dbg_curr_thread->stopped_xpoint = find_triggered_watch(&oldval);
if (dbg_curr_thread->stopped_xpoint > 0)
{
/* If not single-stepping, do not back up over the break instruction */
if (code == EXCEPTION_BREAKPOINT)
addr->Offset += be_cpu->adjust_pc_for_break(&dbg_context, FALSE);
if (!should_stop(dbg_curr_thread->stopped_xpoint)) return TRUE;
dbg_printf("Stopped on watchpoint %d at ", dbg_curr_thread->stopped_xpoint);
print_address(addr, TRUE);
dbg_printf(" values: old=%lu new=%lu\n",
oldval, dbg_curr_process->bp[dbg_curr_thread->stopped_xpoint].w.oldval);
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 == dbg_exec_step_over_line || mode == dbg_exec_step_into_line)
{
if (symbol_get_function_line_status(addr) == dbg_on_a_line_number)
{
(*count)--;
}
}
else if (mode == dbg_exec_step_over_insn || mode == dbg_exec_step_into_insn)
{
(*count)--;
}
if (*count > 0 || mode == dbg_exec_finish)
{
/*
* We still need to execute more instructions.
*/
return TRUE;
}
/* If there's no breakpoint and we are not single-stepping, then
* either we must have encountered a break insn in the Windows program
* or someone is trying to stop us
*/
if (dbg_curr_thread->stopped_xpoint == -1 && code == EXCEPTION_BREAKPOINT)
{
*is_break = TRUE;
addr->Offset += be_cpu->adjust_pc_for_break(&dbg_context, FALSE);
return FALSE;
}
/* no breakpoint, continue if in continuous mode */
return mode == dbg_exec_cont || mode == dbg_exec_finish;
}
/***********************************************************************
* break_suspend_execution
*
* Remove all bp before entering the debug loop
*/
void break_suspend_execution(void)
{
break_set_xpoints(FALSE);
dbg_curr_process->bp[0] = dbg_curr_thread->step_over_bp;
}
/***********************************************************************
* break_restart_execution
*
* Set the bp to the correct state to restart execution
* in the given mode.
*/
void break_restart_execution(int count)
{
ADDRESS addr;
enum dbg_line_status status;
enum dbg_exec_mode mode, ret_mode;
ADDRESS callee;
void* linear;
memory_get_current_pc(&addr);
linear = memory_to_linear_addr(&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 = dbg_curr_thread->exec_mode;
/* we've stopped on a xpoint (other than step over) */
if (dbg_curr_thread->stopped_xpoint > 0)
{
/*
* If we have set a new value, then save it in the BP number.
*/
if (count != 0 && mode == dbg_exec_cont)
{
dbg_curr_process->bp[dbg_curr_thread->stopped_xpoint].skipcount = count;
}
/* If we've stopped on a breakpoint, single step over it (, then run) */
if (is_xpoint_break(dbg_curr_thread->stopped_xpoint))
mode = dbg_exec_step_into_insn;
}
else if (mode == dbg_exec_cont && count > 1)
{
dbg_printf("Not stopped at any breakpoint; argument ignored.\n");
}
if (mode == dbg_exec_finish && be_cpu->is_function_return(linear))
{
mode = ret_mode = dbg_exec_step_into_insn;
}
/*
* 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 (be_cpu->is_function_call(linear, &callee))
{
status = symbol_get_function_line_status(&callee);
#if 0
/* FIXME: we need to get the thunk type */
/*
* Anytime we have a trampoline, step over it.
*/
if ((mode == EXEC_STEP_OVER || mode == EXEC_STEPI_OVER)
&& status == dbg_in_a_thunk)
{
WINE_WARN("Not stepping into trampoline at %p (no lines)\n",
memory_to_linear_addr(&callee));
mode = EXEC_STEP_OVER_TRAMPOLINE;
}
#endif
if (mode == dbg_exec_step_into_line && status == dbg_no_line_info)
{
WINE_WARN("Not stepping into function at %p (no lines)\n",
memory_to_linear_addr(&callee));
mode = dbg_exec_step_over_line;
}
}
if (mode == dbg_exec_step_into_line &&
symbol_get_function_line_status(&addr) == dbg_no_line_info)
{
dbg_printf("Single stepping until exit from function, \n"
"which has no line number information.\n");
ret_mode = mode = dbg_exec_finish;
}
switch (mode)
{
case dbg_exec_cont: /* Continuous execution */
be_cpu->single_step(&dbg_context, FALSE);
break_set_xpoints(TRUE);
break;
#if 0
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.
*/
be_cpu->get_addr(dbg_curr_thread->handle, &dbg_context,
be_cpu_addr_stack, &addr);
/* FIXME: we assume stack grows as on an i386 */
addr.Offset += 2 * sizeof(unsigned int);
dbg_read_memory(memory_to_linear_addr(&addr),
&addr.Offset, sizeof(addr.Offset));
dbg_curr_process->bp[0].addr = addr;
dbg_curr_process->bp[0].enabled = TRUE;
dbg_curr_process->bp[0].refcount = 1;
dbg_curr_process->bp[0].skipcount = 0;
dbg_curr_process->bp[0].xpoint_type = be_xpoint_break;
dbg_curr_process->bp[0].condition = NULL;
be_cpu->single_step(&dbg_context, FALSE);
break_set_xpoints(TRUE);
break;
#endif
case dbg_exec_finish:
case dbg_exec_step_over_insn: /* Stepping over a call */
case dbg_exec_step_over_line: /* Stepping over a call */
if (be_cpu->is_step_over_insn(linear))
{
be_cpu->disasm_one_insn(&addr, FALSE);
dbg_curr_process->bp[0].addr = addr;
dbg_curr_process->bp[0].enabled = TRUE;
dbg_curr_process->bp[0].refcount = 1;
dbg_curr_process->bp[0].skipcount = 0;
dbg_curr_process->bp[0].xpoint_type = be_xpoint_break;
dbg_curr_process->bp[0].condition = NULL;
be_cpu->single_step(&dbg_context, FALSE);
break_set_xpoints(TRUE);
break;
}
/* else fall through to single-stepping */
case dbg_exec_step_into_line: /* Single-stepping a line */
case dbg_exec_step_into_insn: /* Single-stepping an instruction */
be_cpu->single_step(&dbg_context, TRUE);
break;
default: RaiseException(DEBUG_STATUS_INTERNAL_ERROR, 0, 0, NULL);
}
dbg_curr_thread->step_over_bp = dbg_curr_process->bp[0];
dbg_curr_thread->exec_mode = ret_mode;
}
int break_add_condition(int num, struct expr* exp)
{
if (num <= 0 || num >= dbg_curr_process->next_bp ||
!dbg_curr_process->bp[num].refcount)
{
dbg_printf("Invalid breakpoint number %d\n", num);
return FALSE;
}
if (dbg_curr_process->bp[num].condition != NULL)
{
expr_free(dbg_curr_process->bp[num].condition);
dbg_curr_process->bp[num].condition = NULL;
}
if (exp != NULL) dbg_curr_process->bp[num].condition = expr_clone(exp, NULL);
return TRUE;
}
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