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76 lines
2.5 KiB
C
76 lines
2.5 KiB
C
/* Locate TLS data for a thread.
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Copyright (C) 2003, 2004 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include "thread_dbP.h"
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#include <dl-tls.h>
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/* Value used for dtv entries for which the allocation is delayed. */
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# define TLS_DTV_UNALLOCATED ((void *) -1l)
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td_err_e
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td_thr_tlsbase (const td_thrhandle_t *th,
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unsigned long int modid,
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psaddr_t *base)
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{
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if (modid < 1)
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return TD_NOTLS;
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#if USE_TLS
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union dtv pdtv, *dtvp;
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LOG ("td_thr_tlsbase");
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psaddr_t dtvpp = th->th_unique;
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#if TLS_TCB_AT_TP
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dtvpp += offsetof (struct _pthread_descr_struct, p_header.data.dtvp);
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#elif TLS_DTV_AT_TP && TLS_TP_OFFSET > 0
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/* Special case hack. Really this #if should be TLS_TCB_SIZE == 0, but
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when untrue it's a sizeof expression, and that wouldn't fly. In this
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flavor (PowerPC), there is no TCB containing the DTV at the TP, but
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actually the TCB lies behind the TP, i.e. at the very end of the area
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covered by TLS_PRE_TCB_SIZE. */
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dtvpp += TLS_PRE_TCB_SIZE - sizeof (tcbhead_t) + offsetof (tcbhead_t, dtv);
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#elif TLS_DTV_AT_TP
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dtvpp += TLS_PRE_TCB_SIZE + offsetof (tcbhead_t, dtv);
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#else
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# error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined."
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#endif
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/* Get the DTV pointer from the thread descriptor. */
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if (ps_pdread (th->th_ta_p->ph, dtvpp, &dtvp, sizeof dtvp) != PS_OK)
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return TD_ERR; /* XXX Other error value? */
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/* Get the corresponding entry in the DTV. */
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if (ps_pdread (th->th_ta_p->ph, dtvp + modid,
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&pdtv, sizeof (union dtv)) != PS_OK)
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return TD_ERR; /* XXX Other error value? */
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/* It could be that the memory for this module is not allocated for
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the given thread. */
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if (pdtv.pointer == TLS_DTV_UNALLOCATED)
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return TD_TLSDEFER;
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*base = (char *) pdtv.pointer;
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return TD_OK;
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#else
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return TD_ERR;
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#endif
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}
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