ports/sysdeps/tile/__tls_get_addr.S

   1 /* Copyright (C) 2011-2014 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library.  If not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <sysdep.h>
  20 #include <tls.h>
  21 #include <bits/wordsize.h>
  22
  23 #if __WORDSIZE == 64
  24 #define LOG_SIZEOF_DTV_T 4
  25 #else
  26 #define LOG_SIZEOF_DTV_T 3
  27 #endif
  28
  29 /* On entry, r0 points to two words, the module and the offset.
  30    On return, r0 holds the pointer to the relevant TLS memory.
  31    Only registers r25..r29 are clobbered by the call.  */
  32
  33         .text
  34 ENTRY (__tls_get_addr)
  35         {
  36          lnk r25
  37          ADDI_PTR r27, tp, DTV_OFFSET
  38         }
  39 .Llnk:
  40 #ifdef __tilegx__
  41         {
  42          LD_PTR r27, r27        /* r27 = THREAD_DTV() */
  43          moveli r26, hw1_last(_rtld_local + TLS_GENERATION_OFFSET - .Llnk)
  44         }
  45         shl16insli r26, r26, hw0(_rtld_local + TLS_GENERATION_OFFSET - .Llnk)
  46         {
  47          ADD_PTR r25, r25, r26
  48          LD_PTR r26, r0         /* r26 = ti_module */
  49         }
  50 #else
  51         {
  52          LD_PTR r27, r27        /* r27 = THREAD_DTV() */
  53          addli r25, r25, lo16(_rtld_local + TLS_GENERATION_OFFSET - .Llnk)
  54         }
  55         {
  56          auli r25, r25, ha16(_rtld_local + TLS_GENERATION_OFFSET - .Llnk)
  57          LD_PTR r26, r0         /* r26 = ti_module */
  58         }
  59 #endif
  60         LD_PTR r25, r25         /* r25 = DL(dl_tls_generation) */
  61         {
  62          LD_PTR r28, r27        /* r28 = THREAD_DTV()->counter */
  63          ADDI_PTR r29, r0, __SIZEOF_POINTER__
  64         }
  65         {
  66          LD_PTR r29, r29        /* r29 = ti_offset */
  67          CMPEQ r25, r28, r25    /* r25 nonzero if generation OK */
  68          shli r28, r26, LOG_SIZEOF_DTV_T  /* byte index into dtv array */
  69         }
  70         {
  71          BEQZ r25, .Lslowpath
  72          CMPEQI r25, r26, -1    /* r25 nonzero if ti_module invalid */
  73         }
  74         {
  75          BNEZ r25, .Lslowpath
  76          ADD_PTR r28, r28, r27  /* pointer into module array */
  77         }
  78         LD_PTR r26, r28         /* r26 = module TLS pointer */
  79         CMPEQI r25, r26, -1     /* check r26 == TLS_DTV_UNALLOCATED */
  80         BNEZ r25, .Lslowpath
  81         {
  82          ADD_PTR r0, r26, r29
  83          jrp lr
  84         }
  85
  86 .Lslowpath:
  87         {
  88          ST sp, lr
  89          ADDLI_PTR r29, sp, - (25 * REGSIZE)
  90         }
  91         cfi_offset (lr, 0)
  92         {
  93          ST r29, sp
  94          ADDLI_PTR sp, sp, - (26 * REGSIZE)
  95         }
  96         cfi_def_cfa_offset (26 * REGSIZE)
  97         ADDI_PTR r29, sp, (2 * REGSIZE)
  98         { ST r29, r1;  ADDI_PTR r29, r29, REGSIZE }
  99         { ST r29, r2;  ADDI_PTR r29, r29, REGSIZE }
 100         { ST r29, r3;  ADDI_PTR r29, r29, REGSIZE }
 101         { ST r29, r4;  ADDI_PTR r29, r29, REGSIZE }
 102         { ST r29, r5;  ADDI_PTR r29, r29, REGSIZE }
 103         { ST r29, r6;  ADDI_PTR r29, r29, REGSIZE }
 104         { ST r29, r7;  ADDI_PTR r29, r29, REGSIZE }
 105         { ST r29, r8;  ADDI_PTR r29, r29, REGSIZE }
 106         { ST r29, r9;  ADDI_PTR r29, r29, REGSIZE }
 107         { ST r29, r10; ADDI_PTR r29, r29, REGSIZE }
 108         { ST r29, r11; ADDI_PTR r29, r29, REGSIZE }
 109         { ST r29, r12; ADDI_PTR r29, r29, REGSIZE }
 110         { ST r29, r13; ADDI_PTR r29, r29, REGSIZE }
 111         { ST r29, r14; ADDI_PTR r29, r29, REGSIZE }
 112         { ST r29, r15; ADDI_PTR r29, r29, REGSIZE }
 113         { ST r29, r16; ADDI_PTR r29, r29, REGSIZE }
 114         { ST r29, r17; ADDI_PTR r29, r29, REGSIZE }
 115         { ST r29, r18; ADDI_PTR r29, r29, REGSIZE }
 116         { ST r29, r19; ADDI_PTR r29, r29, REGSIZE }
 117         { ST r29, r20; ADDI_PTR r29, r29, REGSIZE }
 118         { ST r29, r21; ADDI_PTR r29, r29, REGSIZE }
 119         { ST r29, r22; ADDI_PTR r29, r29, REGSIZE }
 120         { ST r29, r23; ADDI_PTR r29, r29, REGSIZE }
 121         { ST r29, r24; ADDI_PTR r29, r29, REGSIZE }
 122         .hidden __tls_get_addr_slow
 123         jal __tls_get_addr_slow
 124         ADDI_PTR r29, sp, (2 * REGSIZE)
 125         { LD r1,  r29; ADDI_PTR r29, r29, REGSIZE }
 126         { LD r2,  r29; ADDI_PTR r29, r29, REGSIZE }
 127         { LD r3,  r29; ADDI_PTR r29, r29, REGSIZE }
 128         { LD r4,  r29; ADDI_PTR r29, r29, REGSIZE }
 129         { LD r5,  r29; ADDI_PTR r29, r29, REGSIZE }
 130         { LD r6,  r29; ADDI_PTR r29, r29, REGSIZE }
 131         { LD r7,  r29; ADDI_PTR r29, r29, REGSIZE }
 132         { LD r8,  r29; ADDI_PTR r29, r29, REGSIZE }
 133         { LD r9,  r29; ADDI_PTR r29, r29, REGSIZE }
 134         { LD r10, r29; ADDI_PTR r29, r29, REGSIZE }
 135         { LD r11, r29; ADDI_PTR r29, r29, REGSIZE }
 136         { LD r12, r29; ADDI_PTR r29, r29, REGSIZE }
 137         { LD r13, r29; ADDI_PTR r29, r29, REGSIZE }
 138         { LD r14, r29; ADDI_PTR r29, r29, REGSIZE }
 139         { LD r15, r29; ADDI_PTR r29, r29, REGSIZE }
 140         { LD r16, r29; ADDI_PTR r29, r29, REGSIZE }
 141         { LD r17, r29; ADDI_PTR r29, r29, REGSIZE }
 142         { LD r18, r29; ADDI_PTR r29, r29, REGSIZE }
 143         { LD r19, r29; ADDI_PTR r29, r29, REGSIZE }
 144         { LD r20, r29; ADDI_PTR r29, r29, REGSIZE }
 145         { LD r21, r29; ADDI_PTR r29, r29, REGSIZE }
 146         { LD r22, r29; ADDI_PTR r29, r29, REGSIZE }
 147         { LD r23, r29; ADDI_PTR r29, r29, REGSIZE }
 148         { LD r24, r29; ADDLI_PTR sp, sp, (26 * REGSIZE) }
 149         cfi_def_cfa_offset (0)
 150         LD lr, sp
 151         jrp lr
 152 END (__tls_get_addr)