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/* system/debuggerd/utility.c
**
** Copyright 2008, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
#include <sys/ptrace.h>
#include <sys/exec_elf.h>
#include <signal.h>
#include <assert.h>
#include <string.h>
#include <errno.h>
#include "utility.h"
/* Get a word from pid using ptrace. The result is the return value. */
int get_remote_word(int pid, void *src)
{
return ptrace(PTRACE_PEEKTEXT, pid, src, NULL);
}
/* Handy routine to read aggregated data from pid using ptrace. The read
* values are written to the dest locations directly.
*/
void get_remote_struct(int pid, void *src, void *dst, size_t size)
{
unsigned int i;
for (i = 0; i+4 <= size; i+=4) {
*(int *)((char *)dst+i) = ptrace(PTRACE_PEEKTEXT, pid, (char *)src+i, NULL);
}
if (i < size) {
int val;
assert((size - i) < 4);
val = ptrace(PTRACE_PEEKTEXT, pid, (char *)src+i, NULL);
while (i < size) {
((unsigned char *)dst)[i] = val & 0xff;
i++;
val >>= 8;
}
}
}
/* Map a pc address to the name of the containing ELF file */
const char *map_to_name(mapinfo *mi, unsigned pc, const char* def)
{
while(mi) {
if((pc >= mi->start) && (pc < mi->end)){
return mi->name;
}
mi = mi->next;
}
return def;
}
/* Find the containing map info for the pc */
const mapinfo *pc_to_mapinfo(mapinfo *mi, unsigned pc, unsigned *rel_pc)
{
*rel_pc = pc;
while(mi) {
if((pc >= mi->start) && (pc < mi->end)){
// Only calculate the relative offset for shared libraries
if (strstr(mi->name, ".so")) {
*rel_pc -= mi->start;
}
return mi;
}
mi = mi->next;
}
return NULL;
}
/*
* Returns true if the specified signal has an associated address (i.e. it
* sets siginfo_t.si_addr).
*/
bool signal_has_address(int sig)
{
switch (sig) {
case SIGILL:
case SIGFPE:
case SIGSEGV:
case SIGBUS:
return true;
default:
return false;
}
}
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