static void
event_post_syscall(void *drcontext, int sysnum)
{
#ifdef SHOW_RESULTS
dr_syscall_result_info_t info = { sizeof(info), };
dr_syscall_get_result_ex(drcontext, &info);
if (!info.succeeded) {
/* XXX: we could use the "drsyscall" Extension from the Dr. Memory
* Framework (DRMF) to obtain the name of the system call (as well as
* the number of arguments and the type of each). Please see the strace
* sample and drstrace tool within DRMF for further information.
*/
dr_fprintf(STDERR, "<---- syscall %d failed (returned "PFX" == "SZFMT") ---->\n",
sysnum, info.value, (ptr_int_t)info.value);
}
#endif
if (sysnum == write_sysnum) {
per_thread_t *data = (per_thread_t *) drmgr_get_cls_field(drcontext, tcls_idx);
/* we repeat a write originally to stdout that we redirected to
* stderr: on the repeat we use stdout
*/
if (data->repeat) {
/* repeat syscall with stdout */
int i;
#ifdef SHOW_RESULTS
dr_fprintf(STDERR, "<---- repeating write ---->\n");
#endif
dr_syscall_set_sysnum(drcontext, write_sysnum);
dr_syscall_set_param(drcontext, 0, (reg_t) STDOUT);
for (i = 1; i < SYS_MAX_ARGS; i++)
dr_syscall_set_param(drcontext, i, data->param[i]);
#ifdef WINDOWS
if (dr_is_wow64()) {
/* Set the xcx emulation parameter for wow64: since
* we're executing the same system call again we can
* use that same parameter. For new system calls we'd
* need to determine the parameter from the ntdll
* wrapper.
*/
dr_mcontext_t mc = {sizeof(mc),DR_MC_INTEGER/*only need xcx*/};
dr_get_mcontext(drcontext, &mc);
mc.xcx = data->xcx;
dr_set_mcontext(drcontext, &mc);
}
#endif
dr_syscall_invoke_another(drcontext);
}
}
}
static void
event_post_syscall(void *drcontext, int sysnum)
{
#ifdef SHOW_RESULTS
dr_fprintf(STDERR, " [%d] => "PFX" ("SZFMT")\n",
sysnum,
dr_syscall_get_result(drcontext),
(ptr_int_t)dr_syscall_get_result(drcontext));
#endif
if (sysnum == write_sysnum) {
per_thread_t *data = (per_thread_t *) drmgr_get_cls_field(drcontext, tcls_idx);
/* we repeat a write originally to stdout that we redirected to
* stderr: on the repeat we use stdout
*/
if (data->repeat) {
/* repeat syscall with stdout */
int i;
#ifdef SHOW_RESULTS
dr_fprintf(STDERR, " [%d] => repeating\n", sysnum);
#endif
dr_syscall_set_sysnum(drcontext, write_sysnum);
dr_syscall_set_param(drcontext, 0, (reg_t) STDOUT);
for (i = 1; i < SYS_MAX_ARGS; i++)
dr_syscall_set_param(drcontext, i, data->param[i]);
#ifdef WINDOWS
if (dr_is_wow64()) {
/* Set the xcx emulation parameter for wow64: since
* we're executing the same system call again we can
* use that same parameter. For new system calls we'd
* need to determine the parameter from the ntdll
* wrapper.
*/
dr_mcontext_t mc = {sizeof(mc),DR_MC_INTEGER/*only need xcx*/};
dr_get_mcontext(drcontext, &mc);
mc.xcx = data->xcx;
dr_set_mcontext(drcontext, &mc);
}
#endif
dr_syscall_invoke_another(drcontext);
}
}
}
