sysdeps/arm/setjmp.S

   1 /* setjmp for ARM.
   2    Copyright (C) 1997-2018 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   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 <stap-probe.h>
  21 #include <bits/setjmp.h>
  22 #include <rtld-global-offsets.h>
  23 #include <arm-features.h>
  24
  25 ENTRY (__sigsetjmp)
  26 #ifdef PTR_MANGLE
  27         PTR_MANGLE_LOAD (a3, ip)
  28 #endif
  29         mov     ip, r0
  30
  31         /* setjmp probe expects sigsetjmp first argument (4@r0), second
  32            argument (-4@r1), and target address (4@r14), respectively.  */
  33         LIBC_PROBE (setjmp, 3, 4@r0, -4@r1, 4@r14)
  34
  35         /* Save sp and lr */
  36 #ifdef PTR_MANGLE
  37         mov     a4, sp
  38         PTR_MANGLE2 (a4, a4, a3)
  39         str     a4, [ip], #4
  40         PTR_MANGLE2 (a4, lr, a3)
  41         str     a4, [ip], #4
  42 #else
  43         str     sp, [ip], #4
  44         str     lr, [ip], #4
  45 #endif
  46         /* Save registers */
  47         stmia   ip!, JMP_BUF_REGLIST
  48
  49 #if !defined ARM_ASSUME_NO_IWMMXT || defined __SOFTFP__
  50 # define NEED_HWCAP 1
  51 #endif
  52
  53 #ifdef NEED_HWCAP
  54         /* Check if we have a VFP unit.  */
  55 # if IS_IN (rtld)
  56         LDST_PCREL (ldr, a3, a4, \
  57                     C_SYMBOL_NAME(_rtld_local_ro) \
  58                     + RTLD_GLOBAL_RO_DL_HWCAP_OFFSET)
  59 # else
  60 #  ifdef SHARED
  61         LDR_GLOBAL (a3, a4, C_SYMBOL_NAME(_rtld_global_ro), \
  62                     RTLD_GLOBAL_RO_DL_HWCAP_OFFSET)
  63 #  else
  64         LDR_GLOBAL (a3, a4, C_SYMBOL_NAME(_dl_hwcap), 0)
  65 #  endif
  66 # endif
  67 #endif
  68
  69 #ifdef __SOFTFP__
  70         tst     a3, #HWCAP_ARM_VFP
  71         beq     .Lno_vfp
  72 #endif
  73
  74         /* Store the VFP registers.
  75            Don't use VFP instructions directly because this code
  76            is used in non-VFP multilibs.  */
  77         /* Following instruction is vstmia ip!, {d8-d15}.  */
  78         stc     p11, cr8, [ip], #64
  79 .Lno_vfp:
  80
  81 #ifndef ARM_ASSUME_NO_IWMMXT
  82         tst     a3, #HWCAP_ARM_IWMMXT
  83         beq     .Lno_iwmmxt
  84
  85         /* Save the call-preserved iWMMXt registers.  */
  86         /* Following instructions are wstrd wr10, [ip], #8 (etc.)  */
  87         stcl    p1, cr10, [r12], #8
  88         stcl    p1, cr11, [r12], #8
  89         stcl    p1, cr12, [r12], #8
  90         stcl    p1, cr13, [r12], #8
  91         stcl    p1, cr14, [r12], #8
  92         stcl    p1, cr15, [r12], #8
  93 .Lno_iwmmxt:
  94 #endif
  95
  96         /* Make a tail call to __sigjmp_save; it takes the same args.  */
  97         B       PLTJMP(C_SYMBOL_NAME(__sigjmp_save))
  98
  99 END (__sigsetjmp)
 100
 101 hidden_def (__sigsetjmp)