int tracer_copy_in( struct tracer *t, void *data, const void *uaddr, int length )
{
int result;
static int fast_read_success = 0;
static int fast_read_failure = 0;
static int fast_read_attempts = 100;
UPTRINT_T iuaddr = (UPTRINT_T)uaddr;
#if !defined(CCTOOLS_CPU_I386)
if(!tracer_is_64bit(t)) iuaddr &= 0xffffffff;
#endif
if(fast_read_success>0 || fast_read_failure<fast_read_attempts) {
result = full_pread64(t->memory_file,data,length,iuaddr);
if(result>0) {
fast_read_success++;
return result;
} else {
fast_read_failure++;
// fall through to slow method, print message on the last attempt.
if(fast_read_success==0 && fast_read_failure>=fast_read_attempts) {
debug(D_SYSCALL,"reading from /proc/X/mem failed, falling back to slow ptrace read");
}
}
}
result = tracer_copy_in_slow(t,data,(void*)iuaddr,length);
return result;
}
int tracer_copy_in( struct tracer *t, void *data, const void *uaddr, int length )
{
int result;
static int has_fast_read = 1;
UPTRINT_T iuaddr = (UPTRINT_T)uaddr;
#if !defined(CCTOOLS_CPU_I386)
if(!tracer_is_64bit(t)) iuaddr &= 0xffffffff;
#endif
if(has_fast_read) {
result = full_pread64(t->memory_file,data,length,iuaddr);
if( result<=0 && errno==EINVAL ) {
has_fast_read = 0;
debug(D_SYSCALL,"reading from /proc/X/mem failed, falling back to slow ptrace read");
} else {
return result;
}
}
result = tracer_copy_in_slow(t,data,(void*)iuaddr,length);
return result;
}
ssize_t tracer_copy_in( struct tracer *t, void *data, const void *uaddr, size_t length, int flags )
{
if(length==0) return 0;
#if !defined(CCTOOLS_CPU_I386)
if(!tracer_is_64bit(t)) {
uaddr = VOID_MATH(uaddr, & 0xffffffff);
}
#endif
ssize_t rc = copy_in_fast(t,data,uaddr,length,flags);
if (rc == -1 && errno == ENOSYS && !(flags & TRACER_O_FAST))
rc = tracer_copy_in_slow(t,data,uaddr,length,flags);
assert(!(flags & TRACER_O_ATOMIC) || (rc == -1 || (size_t)rc == length));
return rc;
}
