tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/cmsis/TARGET_NXP/TARGET_LPC11U6X/TOOLCHAIN_GCC_CR/TARGET_LPC11U68/aeabi_romdiv_patch.s

   1 //*****************************************************************************
   2 // aeabi_romdiv_patch.s
   3 //  - Provides "patch" versions of the aeabi integer divide functions to
   4 //    replace the standard ones pulled in from the C library, which vector
   5 //    integer divides onto the rom division functions contained in
   6 //    specific NXP MCUs such as LPC11Uxx and LPC12xx.
   7 //  - Note that this patching will only occur if "__USE_ROMDIVIDE" is
   8 //    defined for the project build for both the compiler and assembler.
   9 //*****************************************************************************
  10 //
  11 // Copyright(C) NXP Semiconductors, 2013
  12 // All rights reserved.
  13 //
  14 // Software that is described herein is for illustrative purposes only
  15 // which provides customers with programming information regarding the
  16 // LPC products.  This software is supplied "AS IS" without any warranties of
  17 // any kind, and NXP Semiconductors and its licensor disclaim any and
  18 // all warranties, express or implied, including all implied warranties of
  19 // merchantability, fitness for a particular purpose and non-infringement of
  20 // intellectual property rights.  NXP Semiconductors assumes no responsibility
  21 // or liability for the use of the software, conveys no license or rights under any
  22 // patent, copyright, mask work right, or any other intellectual property rights in
  23 // or to any products. NXP Semiconductors reserves the right to make changes
  24 // in the software without notification. NXP Semiconductors also makes no
  25 // representation or warranty that such application will be suitable for the
  26 // specified use without further testing or modification.
  27 //
  28 // Permission to use, copy, modify, and distribute this software and its
  29 // documentation is hereby granted, under NXP Semiconductors' and its
  30 // licensor's relevant copyrights in the software, without fee, provided that it
  31 // is used in conjunction with NXP Semiconductors microcontrollers.  This
  32 // copyright, permission, and disclaimer notice must appear in all copies of
  33 // this code.
  34 //*****************************************************************************
  35 #if defined(__USE_ROMDIVIDE)
  36
  37 // Note that the romdivide "divmod" functions are not actually called from
  38 // the below code, as these functions are actually just wrappers to the
  39 // main romdivide "div" functions which push the quotient and remainder onto
  40 // the stack, so as to be compatible with the way that C returns structures.
  41 //
  42 // This is not needed for the aeabi "divmod" functions, as the compiler
  43 // automatically generates code that handles the return values being passed
  44 // back in registers when it generates inline calls to __aeabi_idivmod and
  45 // __aeabi_uidivmod routines.
  46
  47         .syntax unified
  48         .text
  49
  50 // ========= __aeabi_idiv &  __aeabi_idivmod =========
  51         .align 2
  52         .section .text.__aeabi_idiv
  53
  54         .global __aeabi_idiv
  55         .set __aeabi_idivmod, __aeabi_idiv   // make __aeabi_uidivmod an alias
  56         .global __aeabi_idivmod
  57         .global pDivRom_idiv   // pointer to the romdivide 'idiv' functione
  58     .func
  59         .thumb_func
  60         .type   __aeabi_idiv, %function
  61
  62 __aeabi_idiv:
  63         push    {r4, lr}
  64         ldr     r3, =pDivRom_idiv
  65         ldr     r3, [r3, #0]     // Load address of function
  66         blx     r3               // Call divide function
  67         pop     {r4, pc}
  68
  69         .endfunc
  70
  71 // ========  __aeabi_uidiv &  __aeabi_uidivmod ========
  72         .align 2
  73
  74         .section .text.__aeabi_uidiv
  75
  76         .global __aeabi_uidiv
  77         .set __aeabi_uidivmod, __aeabi_uidiv  // make __aeabi_uidivmod an alias
  78         .global __aeabi_uidivmod
  79         .global pDivRom_uidiv   // pointer to the romdivide 'uidiv' function
  80     .func
  81         .thumb_func
  82         .type   __aeabi_uidiv, %function
  83
  84 __aeabi_uidiv:
  85         push    {r4, lr}
  86         ldr     r3, =pDivRom_uidiv
  87         ldr     r3, [r3, #0]      // Load address of function
  88         blx     r3               // Call divide function
  89         pop     {r4, pc}
  90
  91         .endfunc
  92
  93 #endif // (__USE_ROMDIVIDE)