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/****************************************************************
* *
* Copyright (c) 2013-2015 Fidelity National Information *
* Services, Inc. and/or its subsidiaries. All rights reserved. *
* *
* This source code contains the intellectual property *
* of its copyright holder(s), and is made available *
* under a license. If you do not know the terms of *
* the license, please stop and do not read further. *
* *
****************************************************************/
#include "mdef.h"
#include "gtm_string.h"
#include "min_max.h"
#include <rtnhdr.h>
#include "gtmlink.h"
#include "error.h"
#include "gtmio.h"
#ifdef AUTORELINK_SUPPORTED /* This entire file */
GBLREF int object_file_des;
/* Routine called from auto_relink_check() and op_rhdadd() to determine if the routine being called needs to be relinked.
* To return TRUE, the following conditions must be met:
* 1. Auto-relinking must be enabled in the directory the routine was located in (which may be different from the
* directory of the current routine by the same name).
* 2. This must be a newer version of the routine than what is currently linked.
* 3. If the routine is on the stack, recursive relinks must be enabled.
*
* Parameters:
* - zhist - address of zro_hist block of the routine to check if needs relinking
*
* Output:
* - TRUE if new object code is (or may be) available - indicates op_rhd_ext() should relink
* FALSE if currently linked code is up-to-date
*/
boolean_t need_relink(rhdtyp *rtnhdr, zro_hist *zhist)
{
zro_validation_entry *iter;
uint4 cur_cycle, rtnnmlen;
boolean_t norecurslink;
DCL_THREADGBL_ACCESS;
SETUP_THREADGBL_ACCESS;
assert(NULL != zhist); /* Shouldn't be called unless relinking is possible */
/* If $ZROUTINES cycle has changed since validation list was created, signal relink but the relink only
* actually happens if the file op_zlink() locates has a different object hashcode than the currently
* linked routine - else it just rebuilds the history and calls it good.
*/
if (zhist->zroutines_cycle != TREF(set_zroutines_cycle))
{ /* Check if we can return TRUE for this routine */
if ((LINK_NORECURSIVE == TREF(relink_allowed)) && on_stack(rtnhdr, NULL))
return FALSE; /* can't relink, or else we'll get LOADRUNNING */
return TRUE;
}
/* Traverse list corresponding to zro entries */
norecurslink = (LINK_NORECURSIVE == TREF(relink_allowed));
for (iter = &zhist->base[0]; iter != zhist->end; iter++)
{
DEBUG_ONLY(rtnnmlen = mid_len(&iter->relinkrec->rtnname_fixed));
assert((rtnnmlen == rtnhdr->routine_name.len) /* Verify have the right entry - compare names */
&& (0 == memcmp(&iter->relinkrec->rtnname_fixed, rtnhdr->routine_name.addr, rtnnmlen)));
cur_cycle = iter->relinkrec->cycle;
if (cur_cycle != iter->cycle)
{ /* Check if we can return TRUE for this routine */
if (norecurslink && on_stack(rtnhdr, NULL))
return FALSE; /* can't relink, or else we'll get LOADRUNNING */
return TRUE;
}
}
return FALSE;
}
/* Routine called from zro_search_hist() to copy a given search history block from stack memory to malloc'd memory
* so it can be attached to the routine header of the linked routine.
*
* Parameters:
* zhist_valent - Last search history entry + 1
* zhist_valent_base - First search history entry
*
* Return value:
* Malloc'd block of search history header (zro_hist *) followed by the array of search history entries for
* the given routine.
*/
zro_hist *zro_zhist_saverecent(zro_search_hist_ent *zhist_valent_end, zro_search_hist_ent *zhist_valent_base)
{
int hist_len;
relinkrec_t *rec;
zro_hist *lcl_recent_zhist;
zro_validation_entry *zhent;
zro_search_hist_ent *zhist_valent;
mstr rtnname;
DCL_THREADGBL_ACCESS;
SETUP_THREADGBL_ACCESS;
/* Malloc and return zhist copy */
assert(NULL != zhist_valent_end);
assert(NULL != zhist_valent_base);
hist_len = zhist_valent_end - zhist_valent_base;
lcl_recent_zhist = (zro_hist *)malloc(SIZEOF(zro_hist) + (SIZEOF(zro_validation_entry) * hist_len));
lcl_recent_zhist->zroutines_cycle = TREF(set_zroutines_cycle);
lcl_recent_zhist->end = &lcl_recent_zhist->base[0] + hist_len;
assert(NULL == TREF(save_zhist));
TREF(save_zhist) = lcl_recent_zhist;
ESTABLISH_RET(zro_ins_rec_fail_ch, NULL);
for (zhist_valent = zhist_valent_base, zhent = &lcl_recent_zhist->base[0];
0 < hist_len;
zhist_valent++, zhent++, hist_len--)
{
rtnname.addr = zhist_valent->rtnname.c;
rtnname.len = zhist_valent->rtnname_len;
assert(NULL != zhist_valent->zro_valent.relinkctl_bkptr);
rec = relinkctl_insert_record(zhist_valent->zro_valent.relinkctl_bkptr, &rtnname);
assert(NULL != rec);
zhist_valent->zro_valent.relinkrec = rec;
zhist_valent->zro_valent.cycle = rec->cycle;
memcpy((char *)zhent, (char *)&zhist_valent->zro_valent, SIZEOF(zro_validation_entry));
}
REVERT;
TREF(save_zhist) = NULL;
return lcl_recent_zhist;
}
/* Condition handler called when relinkctl_insert_record() fails. We specifically need to (1) release the zro_hist structure
* we allocated and (2) close the object file before driving the next condition handler.
*/
CONDITION_HANDLER(zro_ins_rec_fail_ch)
{
int rc;
START_CH(TRUE);
if (NULL != TREF(save_zhist))
{
free(TREF(save_zhist));
TREF(save_zhist) = NULL;
}
CLOSE_OBJECT_FILE(object_file_des, rc); /* Close object file ignoring error (processing primary error) */
NEXTCH;
}
/* Routine called from zro_search_hist() to add a $ZROUTINES entry to the (local) search history for a given object file.
*
* Parameters:
* zhist_valent - $ZROUTINES search history entry to be filled in.
* obj_container - $ZROUTINES entry for a given object directory.
* rtnname - mstr addr containing name of the routine.
*
*/
void zro_record_zhist(zro_search_hist_ent *zhist_valent, zro_ent *obj_container, mstr *rtnname)
{
open_relinkctl_sgm *linkctl;
int len;
assert(NULL != obj_container);
linkctl = obj_container->relinkctl_sgmaddr;
assert(NULL != linkctl);
zhist_valent->zro_valent.relinkctl_bkptr = linkctl;
assert(NULL != zhist_valent);
assert(rtnname->len < SIZEOF(mident_fixed));
memcpy(zhist_valent->rtnname.c, rtnname->addr, rtnname->len);
zhist_valent->rtnname_len = rtnname->len;
if (SIZEOF(zhist_valent->rtnname) > rtnname->len)
memset((zhist_valent->rtnname.c + rtnname->len), '\0', SIZEOF(zhist_valent->rtnname) - rtnname->len);
}
#endif /* AUTORELINK_SUPPORTED */
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