83 lines
2.9 KiB
ArmAsm
83 lines
2.9 KiB
ArmAsm
//*****************************************************************************
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// aeabi_romdiv_patch.s
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// - Provides "patch" versions of the aeabi integer divide functions to
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// replace the standard ones pulled in from the C library, which vector
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// integer divides onto the rom division functions contained in
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// specific NXP MCUs such as LPC8xx, LPC11Uxx and LPC12xx.
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// - Note that this patching will only occur if "__USE_ROMDIVIDE" is
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// defined for the project build for both the compiler and assembler.
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//*****************************************************************************
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//
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// Copyright 2013-2017, 2019, 2020 NXP
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// All rights reserved.
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//
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// NXP Confidential. This software is owned or controlled by NXP and may only be
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// used strictly in accordance with the applicable license terms.
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//
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// By expressly accepting such terms or by downloading, installing, activating
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// and/or otherwise using the software, you are agreeing that you have read, and
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// that you agree to comply with and are bound by, such license terms.
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//
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// If you do not agree to be bound by the applicable license terms, then you may not
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// retain, install, activate or otherwise use the software.
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//*****************************************************************************
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#if defined(__USE_ROMDIVIDE)
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// Note that the romdivide "divmod" functions are not actually called from
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// the below code, as these functions are actually just wrappers to the
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// main romdivide "div" functions which push the quotient and remainder onto
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// the stack, so as to be compatible with the way that C returns structures.
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//
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// This is not needed for the aeabi "divmod" functions, as the compiler
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// automatically generates code that handles the return values being passed
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// back in registers when it generates inline calls to __aeabi_idivmod and
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// __aeabi_uidivmod routines.
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.syntax unified
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.text
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// ========= __aeabi_idiv & __aeabi_idivmod =========
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.align 2
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.section .text.__aeabi_idiv
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.global __aeabi_idiv
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.set __aeabi_idivmod, __aeabi_idiv // make __aeabi_uidivmod an alias
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.global __aeabi_idivmod
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.global pDivRom_idiv // pointer to the romdivide 'idiv' functione
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.func
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.thumb_func
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.type __aeabi_idiv, %function
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__aeabi_idiv:
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push {r4, lr}
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ldr r3, =pDivRom_idiv
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ldr r3, [r3, #0] // Load address of function
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blx r3 // Call divide function
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pop {r4, pc}
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.endfunc
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// ======== __aeabi_uidiv & __aeabi_uidivmod ========
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.align 2
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.section .text.__aeabi_uidiv
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.global __aeabi_uidiv
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.set __aeabi_uidivmod, __aeabi_uidiv // make __aeabi_uidivmod an alias
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.global __aeabi_uidivmod
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.global pDivRom_uidiv // pointer to the romdivide 'uidiv' function
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.func
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.thumb_func
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.type __aeabi_uidiv, %function
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__aeabi_uidiv:
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push {r4, lr}
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ldr r3, =pDivRom_uidiv
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ldr r3, [r3, #0] // Load address of function
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blx r3 // Call divide function
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pop {r4, pc}
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.endfunc
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#endif // (__USE_ROMDIVIDE)
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