sysdeps/unix/sysv/linux/s390/s390-64/mmap.S

   1 /* Wrapper around mmap system call.  64 bit S/390 version.
   2    Copyright (C) 2001-2014 Free Software Foundation, Inc.
   3    Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <sysdep.h>
  21
  22 #define EINVAL  22
  23
  24         .text
  25
  26 ENTRY(__mmap)
  27         /* Save registers and setup stack frame.  */
  28         stmg    %r6,%r15,48(%r15)
  29         cfi_offset (%r15,-40)
  30         cfi_offset (%r14,-48)
  31         cfi_offset (%r13,-56)
  32         cfi_offset (%r12,-64)
  33         cfi_offset (%r11,-72)
  34         cfi_offset (%r10,-80)
  35         cfi_offset (%r9,-88)
  36         cfi_offset (%r8,-96)
  37         cfi_offset (%r7,-104)
  38         cfi_offset (%r6,-112)
  39         lgr     %r1,%r15
  40         lg      %r0,8(%r15)             /* Load eos.  */
  41         aghi    %r15,-208               /* Buy stack space.  */
  42         cfi_adjust_cfa_offset (208)
  43         stg     %r1,0(%r15)             /* Store back chain.  */
  44         stg     %r0,8(%r15)             /* Store eos.  */
  45
  46         /* Store parameters on stack, because old_mmap
  47            takes only one parameter: a pointer to the parameter area.  */
  48         mvc     200(8,%r15),368(%r15)   /* Move 'offset'.  */
  49         lgfr    %r6,%r6
  50         stg     %r6,192(%r15)           /* Store 'fd'.  */
  51         lgfr    %r5,%r5
  52         stg     %r5,184(%r15)           /* Store 'flags'.  */
  53         lgfr    %r4,%r4
  54         stg     %r4,176(%r15)           /* Store 'prot'.  */
  55         stg     %r3,168(%r15)           /* Store 'length'.  */
  56         stg     %r2,160(%r15)           /* Store 'start'.  */
  57
  58         la      %r2,160(%r15)           /* Load address of parameter list.  */
  59         /* Do the system call trap.  */
  60         svc     SYS_ify(mmap)
  61
  62         lg      %r15,0(%r15)            /* Load back chain.  */
  63         cfi_adjust_cfa_offset (-208)
  64         lmg     %r6,%r15,48(%r15)       /* Load registers.  */
  65
  66         /* Check gpr 2 for error.  */
  67         lghi    %r0,-4096
  68         clgr    %r2,%r0
  69         jgnl    SYSCALL_ERROR_LABEL
  70
  71         /* Successful; return the syscall's value.  */
  72         br      %r14
  73
  74 PSEUDO_END (__mmap)
  75
  76 weak_alias (__mmap, mmap)
  77 weak_alias (__mmap, mmap64)
  78 weak_alias (__mmap, __mmap64)