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#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#ifdef __powerpc__
#include <sys/ptrace.h>
#endif
#include "ltrace.h"
#include "options.h"
#include "debug.h"
#include "dict.h"
#include "elf.h"
/*****************************************************************************/
struct breakpoint *address2bpstruct(struct process *proc, void *addr)
{
return dict_find_entry(proc->breakpoints, addr);
}
void
insert_breakpoint(struct process *proc, void *addr,
struct library_symbol *libsym)
{
struct breakpoint *sbp;
if (!proc->breakpoints) {
proc->breakpoints =
dict_init(dict_key2hash_int, dict_key_cmp_int);
/* atexit(brk_dict_clear); *//* why bother to do this on exit? */
}
if (!addr)
return;
if (libsym)
libsym->needs_init = 0;
sbp = dict_find_entry(proc->breakpoints, addr);
if (!sbp) {
sbp = calloc(1, sizeof(struct breakpoint));
if (!sbp) {
return; /* TODO FIXME XXX: error_mem */
}
dict_enter(proc->breakpoints, addr, sbp);
sbp->addr = addr;
sbp->libsym = libsym;
if (libsym)
libsym->brkpnt = sbp;
}
#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(struct process *proc, void *addr)
{
struct breakpoint *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)
{
if (((struct breakpoint *)sbp)->enabled) {
enable_breakpoint(((struct process *)proc)->pid, sbp);
}
}
void enable_all_breakpoints(struct process *proc)
{
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 (opt_L) {
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);
}
}
proc->breakpoints_enabled = 1;
}
static void disable_bp_cb(void *addr, void *sbp, void *proc)
{
if (((struct breakpoint *)sbp)->enabled) {
disable_breakpoint(((struct process *)proc)->pid, sbp);
}
}
void disable_all_breakpoints(struct process *proc)
{
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)
{
assert(sbp);
free(sbp);
}
void breakpoints_init(struct process *proc)
{
struct library_symbol *sym;
if (proc->breakpoints) { /* let's remove that struct */
/* TODO FIXME XXX: free() all "struct breakpoint"s */
dict_apply_to_all(proc->breakpoints, free_bp_cb, NULL);
dict_clear(proc->breakpoints);
proc->breakpoints = NULL;
}
if (opt_L && proc->filename) {
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;
}
sym = proc->list_of_symbols;
while (sym) {
/* proc->pid==0 delays enabling. */
insert_breakpoint(proc, sym2addr(proc, sym), sym);
sym = sym->next;
}
proc->callstack_depth = 0;
proc->breakpoints_enabled = -1;
}
void reinitialize_breakpoints(struct process *proc)
{
struct library_symbol *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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