checkasm-arm.S
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/****************************************************************************
* checkasm-arm.S: assembly check tool
*****************************************************************************
* Copyright (C) 2015-2024 x264 project
*
* Authors: Martin Storsjo <martin@martin.st>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
*
* This program is also available under a commercial proprietary license.
* For more information, contact us at licensing@x264.com.
*****************************************************************************/
#include "../common/arm/asm.S"
const register_init, align=4
.quad 0x21f86d66c8ca00ce
.quad 0x75b6ba21077c48ad
.quad 0xed56bb2dcb3c7736
.quad 0x8bda43d3fd1a7e06
.quad 0xb64a9c9e5d318408
.quad 0xdf9a54b303f1d3a3
.quad 0x4a75479abd64e097
.quad 0x249214109d5d1c88
endconst
const error_message
.asciz "failed to preserve register"
endconst
.text
@ max number of args used by any x264 asm function.
#define MAX_ARGS 15
#define ARG_STACK 4*(MAX_ARGS - 4)
@ align the used stack space to 8 to preserve the stack alignment
#define ARG_STACK_A (((ARG_STACK + pushed + 7) & ~7) - pushed)
.macro clobbercheck variant
.equ pushed, 4*10
function checkasm_call_\variant
push {r4-r11, lr}
.ifc \variant, neon
vpush {q4-q7}
.equ pushed, pushed + 16*4
.endif
movrel r12, register_init
.ifc \variant, neon
vldm r12, {q4-q7}
.endif
ldm r12, {r4-r11}
push {r1}
sub sp, sp, #ARG_STACK_A
.equ pos, 0
.rept MAX_ARGS-4
ldr r12, [sp, #ARG_STACK_A + pushed + 8 + pos]
str r12, [sp, #pos]
.equ pos, pos + 4
.endr
mov r12, r0
mov r0, r2
mov r1, r3
ldrd r2, r3, [sp, #ARG_STACK_A + pushed]
blx r12
add sp, sp, #ARG_STACK_A
pop {r2}
push {r0, r1}
movrel r12, register_init
.ifc \variant, neon
vldm r12, {q0-q3}
veor q0, q0, q4
veor q1, q1, q5
veor q2, q2, q6
veor q3, q3, q7
vorr q0, q0, q1
vorr q0, q0, q2
vorr q0, q0, q3
vorr d0, d0, d1
vrev64.32 d1, d0
vorr d0, d0, d1
vmov.32 r3, d0[0]
.else
mov r3, #0
.endif
.macro check_reg reg1, reg2=
ldrd r0, r1, [r12], #8
eor r0, r0, \reg1
orr r3, r3, r0
.ifnb \reg2
eor r1, r1, \reg2
orr r3, r3, r1
.endif
.endm
check_reg r4, r5
check_reg r6, r7
@ r9 is a volatile register in the ios ABI
#if SYS_MACOSX
check_reg r8
#else
check_reg r8, r9
#endif
check_reg r10, r11
.purgem check_reg
cmp r3, #0
beq 0f
mov r12, #0
str r12, [r2]
movrel r0, error_message
blx EXT(puts)
0:
pop {r0, r1}
.ifc \variant, neon
vpop {q4-q7}
.endif
pop {r4-r11, pc}
endfunc
.endm
clobbercheck neon
clobbercheck noneon