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#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#ifdef __powerpc__
#include <sys/ptrace.h>
#endif
#include "common.h"
/*****************************************************************************/
Breakpoint *
address2bpstruct(Process *proc, void *addr) {
debug(DEBUG_FUNCTION, "address2bpstruct(pid=%d, addr=%p)", proc->pid, addr);
return dict_find_entry(proc->breakpoints, addr);
}
void
insert_breakpoint(Process *proc, void *addr,
struct library_symbol *libsym) {
Breakpoint *sbp;
debug(DEBUG_FUNCTION, "insert_breakpoint(pid=%d, addr=%p, symbol=%s)", proc->pid, addr, libsym ? libsym->name : "NULL");
debug(1, "symbol=%s, addr=%p", libsym?libsym->name:"(nil)", addr);
if (!addr)
return;
if (libsym)
libsym->needs_init = 0;
sbp = dict_find_entry(proc->breakpoints, addr);
if (!sbp) {
sbp = calloc(1, sizeof(Breakpoint));
if (!sbp) {
return; /* TODO FIXME XXX: error_mem */
}
dict_enter(proc->breakpoints, addr, sbp);
sbp->addr = addr;
sbp->libsym = libsym;
}
#ifdef __arm__
sbp->thumb_mode = proc->thumb_mode;
proc->thumb_mode = 0;
#endif
sbp->enabled++;
if (sbp->enabled == 1 && proc->pid)
enable_breakpoint(proc->pid, sbp);
}
void
delete_breakpoint(Process *proc, void *addr) {
Breakpoint *sbp;
debug(DEBUG_FUNCTION, "delete_breakpoint(pid=%d, addr=%p)", proc->pid, addr);
sbp = dict_find_entry(proc->breakpoints, addr);
assert(sbp); /* FIXME: remove after debugging has been done. */
/* This should only happen on out-of-memory conditions. */
if (sbp == NULL)
return;
sbp->enabled--;
if (sbp->enabled == 0)
disable_breakpoint(proc->pid, sbp);
assert(sbp->enabled >= 0);
}
static void
enable_bp_cb(void *addr, void *sbp, void *proc) {
debug(DEBUG_FUNCTION, "enable_bp_cb(pid=%d)", ((Process *)proc)->pid);
if (((Breakpoint *)sbp)->enabled) {
enable_breakpoint(((Process *)proc)->pid, sbp);
}
}
void
enable_all_breakpoints(Process *proc) {
debug(DEBUG_FUNCTION, "enable_all_breakpoints(pid=%d)", proc->pid);
if (proc->breakpoints_enabled <= 0) {
#ifdef __powerpc__
unsigned long a;
/*
* PPC HACK! (XXX FIXME TODO)
* If the dynamic linker hasn't populated the PLT then
* dont enable the breakpoints
*/
if (options.libcalls) {
a = ptrace(PTRACE_PEEKTEXT, proc->pid,
sym2addr(proc, proc->list_of_symbols),
0);
if (a == 0x0)
return;
}
#endif
debug(1, "Enabling breakpoints for pid %u...", proc->pid);
if (proc->breakpoints) {
dict_apply_to_all(proc->breakpoints, enable_bp_cb,
proc);
}
#ifdef __mips__
{
/*
* I'm sure there is a nicer way to do this. We need to
* insert breakpoints _after_ the child has been started.
*/
struct library_symbol *sym;
struct library_symbol *new_sym;
sym=proc->list_of_symbols;
while(sym){
void *addr= sym2addr(proc,sym);
if(!addr){
sym=sym->next;
continue;
}
if(dict_find_entry(proc->breakpoints,addr)){
sym=sym->next;
continue;
}
debug(2,"inserting bp %p %s",addr,sym->name);
new_sym=malloc(sizeof(*new_sym));
memcpy(new_sym,sym,sizeof(*new_sym));
new_sym->next=proc->list_of_symbols;
proc->list_of_symbols=new_sym;
insert_breakpoint(proc, addr, new_sym);
sym=sym->next;
}
}
#endif
}
proc->breakpoints_enabled = 1;
}
static void
disable_bp_cb(void *addr, void *sbp, void *proc) {
debug(DEBUG_FUNCTION, "disable_bp_cb(pid=%d)", ((Process *)proc)->pid);
if (((Breakpoint *)sbp)->enabled) {
disable_breakpoint(((Process *)proc)->pid, sbp);
}
}
void
disable_all_breakpoints(Process *proc) {
debug(DEBUG_FUNCTION, "disable_all_breakpoints(pid=%d)", proc->pid);
if (proc->breakpoints_enabled) {
debug(1, "Disabling breakpoints for pid %u...", proc->pid);
dict_apply_to_all(proc->breakpoints, disable_bp_cb, proc);
}
proc->breakpoints_enabled = 0;
}
static void
free_bp_cb(void *addr, void *sbp, void *data) {
debug(DEBUG_FUNCTION, "free_bp_cb(sbp=%p)", sbp);
assert(sbp);
free(sbp);
}
void
breakpoints_init(Process *proc) {
struct library_symbol *sym;
debug(DEBUG_FUNCTION, "breakpoints_init(pid=%d)", proc->pid);
if (proc->breakpoints) { /* let's remove that struct */
dict_apply_to_all(proc->breakpoints, free_bp_cb, NULL);
dict_clear(proc->breakpoints);
proc->breakpoints = NULL;
}
proc->breakpoints = dict_init(dict_key2hash_int, dict_key_cmp_int);
if (options.libcalls && proc->filename) {
/* FIXME: memory leak when called by exec(): */
proc->list_of_symbols = read_elf(proc);
if (opt_e) {
struct library_symbol **tmp1 = &(proc->list_of_symbols);
while (*tmp1) {
struct opt_e_t *tmp2 = opt_e;
int keep = !opt_e_enable;
while (tmp2) {
if (!strcmp((*tmp1)->name, tmp2->name)) {
keep = opt_e_enable;
}
tmp2 = tmp2->next;
}
if (!keep) {
*tmp1 = (*tmp1)->next;
} else {
tmp1 = &((*tmp1)->next);
}
}
}
} else {
proc->list_of_symbols = NULL;
}
for (sym = proc->list_of_symbols; sym; sym = sym->next) {
/* proc->pid==0 delays enabling. */
insert_breakpoint(proc, sym2addr(proc, sym), sym);
}
proc->callstack_depth = 0;
proc->breakpoints_enabled = -1;
}
void
reinitialize_breakpoints(Process *proc) {
struct library_symbol *sym;
debug(DEBUG_FUNCTION, "reinitialize_breakpoints(pid=%d)", proc->pid);
sym = proc->list_of_symbols;
while (sym) {
if (sym->needs_init) {
insert_breakpoint(proc, sym2addr(proc, sym),
sym);
if (sym->needs_init && !sym->is_weak) {
fprintf(stderr,
"could not re-initialize breakpoint for \"%s\" in file \"%s\"\n",
sym->name, proc->filename);
exit(1);
}
}
sym = sym->next;
}
}
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