gcc/config/arm/bpabi.S

   1 /* Miscellaneous BPABI functions.
   2
   3    Copyright (C) 2003, 2004, 2007, 2008, 2009, 2010
   4    Free Software Foundation, Inc.
   5    Contributed by CodeSourcery, LLC.
   6
   7    This file is free software; you can redistribute it and/or modify it
   8    under the terms of the GNU General Public License as published by the
   9    Free Software Foundation; either version 3, or (at your option) any
  10    later version.
  11
  12    This file is distributed in the hope that it will be useful, but
  13    WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    General Public License for more details.
  16
  17    Under Section 7 of GPL version 3, you are granted additional
  18    permissions described in the GCC Runtime Library Exception, version
  19    3.1, as published by the Free Software Foundation.
  20
  21    You should have received a copy of the GNU General Public License and
  22    a copy of the GCC Runtime Library Exception along with this program;
  23    see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  24    <http://www.gnu.org/licenses/>.  */
  25
  26 #ifdef __ARM_EABI__
  27 /* Some attributes that are common to all routines in this file.  */
  28         /* Tag_ABI_align_needed: This code does not require 8-byte
  29            alignment from the caller.  */
  30         /* .eabi_attribute 24, 0  -- default setting.  */
  31         /* Tag_ABI_align_preserved: This code preserves 8-byte
  32            alignment in any callee.  */
  33         .eabi_attribute 25, 1
  34 #endif /* __ARM_EABI__ */
  35
  36 #ifdef L_aeabi_lcmp
  37
  38 ARM_FUNC_START aeabi_lcmp
  39         cmp     xxh, yyh
  40         do_it   lt
  41         movlt   r0, #-1
  42         do_it   gt
  43         movgt   r0, #1
  44         do_it   ne
  45         RETc(ne)
  46         subs    r0, xxl, yyl
  47         do_it   lo
  48         movlo   r0, #-1
  49         do_it   hi
  50         movhi   r0, #1
  51         RET
  52         FUNC_END aeabi_lcmp
  53
  54 #endif /* L_aeabi_lcmp */
  55
  56 #ifdef L_aeabi_ulcmp
  57
  58 ARM_FUNC_START aeabi_ulcmp
  59         cmp     xxh, yyh
  60         do_it   lo
  61         movlo   r0, #-1
  62         do_it   hi
  63         movhi   r0, #1
  64         do_it   ne
  65         RETc(ne)
  66         cmp     xxl, yyl
  67         do_it   lo
  68         movlo   r0, #-1
  69         do_it   hi
  70         movhi   r0, #1
  71         do_it   eq
  72         moveq   r0, #0
  73         RET
  74         FUNC_END aeabi_ulcmp
  75
  76 #endif /* L_aeabi_ulcmp */
  77
  78 .macro test_div_by_zero signed
  79 /* Tail-call to divide-by-zero handlers which may be overridden by the user,
  80    so unwinding works properly.  */
  81 #if defined(__thumb2__)
  82         cbnz    yyh, 1f
  83         cbnz    yyl, 1f
  84         cmp     xxh, #0
  85         do_it   eq
  86         cmpeq   xxl, #0
  87         .ifc \signed, unsigned
  88         beq     2f
  89         mov     xxh, #0xffffffff
  90         mov     xxl, xxh
  91 2:
  92         .else
  93         do_it   lt, t
  94         movlt   xxl, #0
  95         movlt   xxh, #0x80000000
  96         do_it   gt, t
  97         movgt   xxh, #0x7fffffff
  98         movgt   xxl, #0xffffffff
  99         .endif
 100         b       SYM (__aeabi_ldiv0) __PLT__
 101 1:
 102 #else
 103         /* Note: Thumb-1 code calls via an ARM shim on processors which
 104            support ARM mode.  */
 105         cmp     yyh, #0
 106         cmpeq   yyl, #0
 107         bne     2f
 108         cmp     xxh, #0
 109         cmpeq   xxl, #0
 110         .ifc \signed, unsigned
 111         movne   xxh, #0xffffffff
 112         movne   xxl, #0xffffffff
 113         .else
 114         movlt   xxh, #0x80000000
 115         movlt   xxl, #0
 116         movgt   xxh, #0x7fffffff
 117         movgt   xxl, #0xffffffff
 118         .endif
 119         b       SYM (__aeabi_ldiv0) __PLT__
 120 2:
 121 #endif
 122 .endm
 123
 124 #ifdef L_aeabi_ldivmod
 125
 126 ARM_FUNC_START aeabi_ldivmod
 127         test_div_by_zero signed
 128
 129         sub sp, sp, #8
 130 #if defined(__thumb2__)
 131         mov ip, sp
 132         push {ip, lr}
 133 #else
 134         do_push {sp, lr}
 135 #endif
 136         bl SYM(__gnu_ldivmod_helper) __PLT__
 137         ldr lr, [sp, #4]
 138         add sp, sp, #8
 139         do_pop {r2, r3}
 140         RET
 141
 142 #endif /* L_aeabi_ldivmod */
 143
 144 #ifdef L_aeabi_uldivmod
 145
 146 ARM_FUNC_START aeabi_uldivmod
 147         test_div_by_zero unsigned
 148
 149         sub sp, sp, #8
 150 #if defined(__thumb2__)
 151         mov ip, sp
 152         push {ip, lr}
 153 #else
 154         do_push {sp, lr}
 155 #endif
 156         bl SYM(__gnu_uldivmod_helper) __PLT__
 157         ldr lr, [sp, #4]
 158         add sp, sp, #8
 159         do_pop {r2, r3}
 160         RET
 161
 162 #endif /* L_aeabi_divmod */
 163