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https://github.com/nyanmisaka/ffmpeg-rockchip.git
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0b40e290e3
* commit '26ec75aec3576daea691dee53a78ec67c0dc4040': checkasm: Check register clobbering on arm Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>
143 lines
3.5 KiB
ArmAsm
143 lines
3.5 KiB
ArmAsm
/****************************************************************************
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* Assembly testing and benchmarking tool
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* Copyright (c) 2015 Martin Storsjo
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* Copyright (c) 2015 Janne Grunau
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
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*****************************************************************************/
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#include "libavutil/arm/asm.S"
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const register_init
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.quad 0x21f86d66c8ca00ce
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.quad 0x75b6ba21077c48ad
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.quad 0xed56bb2dcb3c7736
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.quad 0x8bda43d3fd1a7e06
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.quad 0xb64a9c9e5d318408
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.quad 0xdf9a54b303f1d3a3
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.quad 0x4a75479abd64e097
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.quad 0x249214109d5d1c88
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endconst
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const error_message
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.asciz "failed to preserve register"
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endconst
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@ max number of args used by any asm function.
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#define MAX_ARGS 15
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#define ARG_STACK 4*(MAX_ARGS - 2)
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.macro clobbercheck variant
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.equ pushed, 4*9
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function checkasm_checked_call_\variant, export=1
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push {r4-r11, lr}
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.ifc \variant, vfp
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vpush {d8-d15}
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fmrx r4, FPSCR
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push {r4}
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.equ pushed, pushed + 16*4 + 4
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.endif
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movrel r12, register_init
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.ifc \variant, vfp
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vldm r12, {d8-d15}
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.endif
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ldm r12, {r4-r11}
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sub sp, sp, #ARG_STACK
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.equ pos, 0
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.rept MAX_ARGS-2
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ldr r12, [sp, #ARG_STACK + pushed + 8 + pos]
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str r12, [sp, #pos]
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.equ pos, pos + 4
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.endr
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mov r12, r0
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mov r0, r2
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mov r1, r3
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ldrd r2, r3, [sp, #ARG_STACK + pushed]
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blx r12
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add sp, sp, #ARG_STACK
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push {r0, r1}
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movrel r12, register_init
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mov r3, #0
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.ifc \variant, vfp
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.macro check_reg_vfp, dreg, inc=8
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ldrd r0, r1, [r12], #\inc
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vmov r2, lr, \dreg
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eor r0, r0, r2
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eor r1, r1, lr
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orr r3, r3, r0
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orr r3, r3, r1
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.endm
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.irp n, 8, 9, 10, 11, 12, 13, 14
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check_reg_vfp d\n
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.endr
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check_reg_vfp d15, -56
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.purgem check_reg_vfp
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fmrx r0, FPSCR
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ldr r1, [sp, #8]
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eor r0, r0, r1
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@ Ignore changes in the topmost 5 bits
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lsl r0, r0, #5
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orr r3, r3, r0
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.endif
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.macro check_reg reg1, reg2=
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ldrd r0, r1, [r12], #8
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eor r0, r0, \reg1
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orrs r3, r3, r0
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.ifnb \reg2
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eor r1, r1, \reg2
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orrs r3, r3, r1
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.endif
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.endm
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check_reg r4, r5
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check_reg r6, r7
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@ r9 is a volatile register in the ios ABI
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#ifdef __APPLE__
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check_reg r8
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#else
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check_reg r8, r9
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#endif
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check_reg r10, r11
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.purgem check_reg
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beq 0f
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movrel r0, error_message
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blx X(checkasm_fail_func)
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0:
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pop {r0, r1}
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.ifc \variant, vfp
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pop {r2}
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fmxr FPSCR, r2
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vpop {d8-d15}
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.endif
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pop {r4-r11, pc}
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endfunc
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.endm
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#if HAVE_VFP || HAVE_NEON
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clobbercheck vfp
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#endif
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clobbercheck novfp
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