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// -*- Mode: asm; -*-
//
// Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
//
// Use of this source code is governed by a BSD-style license
// that can be found in the LICENSE file in the root of the source
// tree. An additional intellectual property rights grant can be found
// in the file PATENTS. All contributing project authors may
// be found in the AUTHORS file in the root of the source tree.
//
// This file was originally licensed as follows. It has been
// relicensed with permission from the copyright holders.
//
//
// File Name: armCOMM_s.h
// OpenMAX DL: v1.0.2
// Last Modified Revision: 13871
// Last Modified Date: Fri, 09 May 2008
//
// (c) Copyright 2007-2008 ARM Limited. All Rights Reserved.
//
//
//
// ARM optimized OpenMAX common header file
//
.set _SBytes, 0 // Number of scratch bytes on stack
.set _Workspace, 0 // Stack offset of scratch workspace
.set _RRegList, 0 // R saved register list (last register number)
.set _DRegList, 0 // D saved register list (last register number)
// Work out list of D saved registers, like for R registers.
.macro _M_GETDREGLIST dreg
.ifeqs "\dreg", ""
.set _DRegList, 0
.exitm
.endif
.ifeqs "\dreg", "d8"
.set _DRegList, 8
.exitm
.endif
.ifeqs "\dreg", "d9"
.set _DRegList, 9
.exitm
.endif
.ifeqs "\dreg", "d10"
.set _DRegList, 10
.exitm
.endif
.ifeqs "\dreg", "d11"
.set _DRegList, 11
.exitm
.endif
.ifeqs "\dreg", "d12"
.set _DRegList, 12
.exitm
.endif
.ifeqs "\dreg", "d13"
.set _DRegList, 13
.exitm
.endif
.ifeqs "\dreg", "d14"
.set _DRegList, 14
.exitm
.endif
.ifeqs "\dreg", "d15"
.set _DRegList, 15
.exitm
.endif
.warning "Unrecognized saved d register limit: \rreg"
.endm
//////////////////////////////////////////////////////////
// Function header and footer macros
//////////////////////////////////////////////////////////
// Function Header Macro
// Generates the function prologue
// Note that functions should all be "stack-moves-once"
// The FNSTART and FNEND macros should be the only places
// where the stack moves.
//
// name = function name
// rreg = "" don't stack any registers
// "lr" stack "lr" only
// "rN" stack registers "r4-rN,lr"
// dreg = "" don't stack any D registers
// "dN" stack registers "d8-dN"
//
// Note: ARM Archicture procedure call standard AAPCS
// states that r4-r11, sp, d8-d15 must be preserved by
// a compliant function.
.macro M_START name, rreg, dreg
.set _Workspace, 0
// Define the function and make it external.
.global \name
.func \name
.section .text.\name,"ax",%progbits
.align 4
\name :
//.fnstart
// Save specified R registers
_M_PUSH_RREG
// Save specified D registers
_M_GETDREGLIST \dreg
_M_PUSH_DREG
// Ensure size claimed on stack is 16-byte aligned for ARM64
.if (_SBytes & 15) != 0
.set _SBytes, _SBytes + (16 - (_SBytes & 15))
.endif
.if _SBytes != 0
sub sp, sp, #_SBytes
.endif
.endm
// Function Footer Macro
// Generates the function epilogue
.macro M_END
// Restore the stack pointer to its original value on function entry
.if _SBytes != 0
add sp, sp, #_SBytes
.endif
// Restore any saved R or D registers.
_M_RET
//.fnend
.endfunc
// Reset the global stack tracking variables back to their
// initial values.
.set _SBytes, 0
.endm
// Based on the value of _DRegList, push the specified set of registers
// to the stack.
// The ARM64 ABI says only v8-v15 needs to be saved across calls and only
// the lower 64 bits need to be saved.
.macro _M_PUSH_DREG
.if _DRegList >= 8
sub sp, sp, (_DRegList - 7) * 16 // 16-byte alignment
str q8, [sp]
.endif
.if _DRegList >= 9
str q9, [sp, #16]
.endif
.if _DRegList >= 10
str q10, [sp, #32]
.endif
.if _DRegList >= 11
str q11, [sp, #48]
.endif
.if _DRegList >= 12
str q12, [sp, #64]
.endif
.if _DRegList >= 13
str q13, [sp, #80]
.endif
.if _DRegList >= 14
str q14, [sp, #96]
.endif
.if _DRegList >= 15
str q15, [sp, #112]
.endif
.exitm
.endm
// Based on the value of _RRegList, push the specified set of registers
// to the stack.
// The ARM64 ABI says registers r19-r29 needs to be saved across calls.
// But for the FFT routines, we don't need to save anything, so just
// preserve the SP and LR.
.macro _M_PUSH_RREG
sub sp, sp, #16
str x30, [sp]
str x29, [sp, #8]
.exitm
.endm
// The opposite of _M_PUSH_DREG
.macro _M_POP_DREG
.if _DRegList >= 8
ldr q8, [sp]
.endif
.if _DRegList >= 9
ldr q9, [sp, #16]
.endif
.if _DRegList >= 10
ldr q10, [sp, #32]
.endif
.if _DRegList >= 11
ldr q11, [sp, #48]
.endif
.if _DRegList >= 12
ldr q12, [sp, #64]
.endif
.if _DRegList >= 13
ldr q13, [sp, #80]
.endif
.if _DRegList >= 14
ldr q14, [sp, #96]
.endif
.if _DRegList >= 15
ldr q15, [sp, #112]
.endif
.if _DRegList >= 8
add sp, sp, (_DRegList - 7) * 16 // 16-byte alignment
.endif
.exitm
.endm
// The opposite of _M_PUSH_RREG
.macro _M_POP_RREG cc
ldr x29, [sp, #8]
ldr x30, [sp]
add sp, sp, #16
.exitm
.endm
// Produce function return instructions
.macro _M_RET cc
_M_POP_DREG \cc
_M_POP_RREG \cc
ret
.endm
// rsb - reverse subtract
// compute dst = src2 - src1, useful when src2 is an immediate value
.macro rsb dst, src1, src2
sub \dst, \src1, \src2
neg \dst, \dst
.endm
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