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https://github.com/FFmpeg/FFmpeg.git
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6a1ea4ec93
The warning has false positives but our asm does not trigger it. For new code false positives can only be avoided by changing the register allocation.
350 lines
8.5 KiB
ArmAsm
350 lines
8.5 KiB
ArmAsm
/*
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* Copyright (c) 2008 Mans Rullgard <mans@mansr.com>
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "config.h"
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#ifdef __ELF__
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# define ELF
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#else
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# define ELF @
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#endif
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#if CONFIG_THUMB
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# define A @
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# define T
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#else
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# define A
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# define T @
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#endif
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#if HAVE_AS_FUNC
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# define FUNC
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#else
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# define FUNC @
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#endif
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#if HAVE_AS_FPU_DIRECTIVE
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# define FPU
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#else
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# define FPU @
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#endif
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#if HAVE_NEON
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.arch armv7-a
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#elif HAVE_ARMV6T2
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.arch armv6t2
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#elif HAVE_ARMV6
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.arch armv6
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#elif HAVE_ARMV5TE
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.arch armv5te
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#endif
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#if HAVE_AS_OBJECT_ARCH
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ELF .object_arch armv4
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#endif
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#if HAVE_NEON
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FPU .fpu neon
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ELF .eabi_attribute 10, 0 @ suppress Tag_FP_arch
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ELF .eabi_attribute 12, 0 @ suppress Tag_Advanced_SIMD_arch
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#elif HAVE_VFP
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FPU .fpu vfp
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ELF .eabi_attribute 10, 0 @ suppress Tag_FP_arch
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#endif
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.syntax unified
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T .thumb
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ELF .eabi_attribute 25, 1 @ Tag_ABI_align_preserved
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ELF .section .note.GNU-stack,"",%progbits @ Mark stack as non-executable
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.macro function name, export=0, align=2
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.set .Lpic_idx, 0
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.set .Lpic_gp, 0
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.macro endfunc
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.if .Lpic_idx
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.align 2
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.altmacro
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put_pic %(.Lpic_idx - 1)
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.noaltmacro
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.endif
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.if .Lpic_gp
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.unreq gp
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.endif
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ELF .size \name, . - \name
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FUNC .endfunc
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.purgem endfunc
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.endm
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.text
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.align \align
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.if \export
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.global EXTERN_ASM\name
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ELF .type EXTERN_ASM\name, %function
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FUNC .func EXTERN_ASM\name
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EXTERN_ASM\name:
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.else
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ELF .type \name, %function
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FUNC .func \name
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\name:
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.endif
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.endm
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.macro const name, align=2, relocate=0
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.macro endconst
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ELF .size \name, . - \name
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.purgem endconst
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.endm
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.if HAVE_SECTION_DATA_REL_RO && \relocate
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.section .data.rel.ro
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.else
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.section .rodata
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.endif
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.align \align
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\name:
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.endm
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#if !HAVE_ARMV6T2_EXTERNAL
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.macro movw rd, val
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mov \rd, \val & 255
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orr \rd, \val & ~255
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.endm
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#endif
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.macro mov32 rd, val
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#if HAVE_ARMV6T2_EXTERNAL
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movw \rd, #(\val) & 0xffff
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.if (\val) >> 16
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movt \rd, #(\val) >> 16
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.endif
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#else
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ldr \rd, =\val
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#endif
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.endm
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.macro put_pic num
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put_pic_\num
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.endm
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.macro do_def_pic num, val, label
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.macro put_pic_\num
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.if \num
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.altmacro
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put_pic %(\num - 1)
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.noaltmacro
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.endif
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\label: .word \val
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.purgem put_pic_\num
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.endm
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.endm
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.macro def_pic val, label
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.altmacro
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do_def_pic %.Lpic_idx, \val, \label
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.noaltmacro
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.set .Lpic_idx, .Lpic_idx + 1
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.endm
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.macro ldpic rd, val, indir=0
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ldr \rd, .Lpicoff\@
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.Lpic\@:
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.if \indir
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A ldr \rd, [pc, \rd]
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T add \rd, pc
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T ldr \rd, [\rd]
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.else
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add \rd, pc
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.endif
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def_pic \val - (.Lpic\@ + (8 >> CONFIG_THUMB)), .Lpicoff\@
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.endm
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.macro movrel rd, val
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#if CONFIG_PIC
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ldpic \rd, \val
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#elif HAVE_ARMV6T2_EXTERNAL && !defined(__APPLE__)
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movw \rd, #:lower16:\val
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movt \rd, #:upper16:\val
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#else
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ldr \rd, =\val
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#endif
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.endm
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.macro movrelx rd, val, gp
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.ifc \rd,\gp
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.error "movrelx needs two distinct registers"
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.endif
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.ifc \rd\()_\gp,r12_
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.warning "movrelx rd=\rd without explicit set gp"
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.endif
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.ifc \rd\()_\gp,ip_
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.warning "movrelx rd=\rd without explicit set gp"
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.endif
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#if CONFIG_PIC && defined(__ELF__)
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.ifnb \gp
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.if .Lpic_gp
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.unreq gp
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.endif
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gp .req \gp
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ldpic gp, _GLOBAL_OFFSET_TABLE_
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.elseif !.Lpic_gp
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gp .req r12
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ldpic gp, _GLOBAL_OFFSET_TABLE_
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.endif
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.set .Lpic_gp, 1
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ldr \rd, .Lpicoff\@
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ldr \rd, [gp, \rd]
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def_pic \val(GOT), .Lpicoff\@
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#elif CONFIG_PIC && defined(__APPLE__)
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ldpic \rd, .Lpic\@, indir=1
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.non_lazy_symbol_pointer
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.Lpic\@:
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.indirect_symbol \val
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.word 0
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.text
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#else
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movrel \rd, \val
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#endif
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.endm
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.macro add_sh rd, rn, rm, sh:vararg
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A add \rd, \rn, \rm, \sh
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T mov \rm, \rm, \sh
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T add \rd, \rn, \rm
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.endm
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.macro ldr_pre rt, rn, rm:vararg
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A ldr \rt, [\rn, \rm]!
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T add \rn, \rn, \rm
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T ldr \rt, [\rn]
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.endm
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.macro ldr_dpre rt, rn, rm:vararg
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A ldr \rt, [\rn, -\rm]!
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T sub \rn, \rn, \rm
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T ldr \rt, [\rn]
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.endm
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.macro ldr_nreg rt, rn, rm:vararg
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A ldr \rt, [\rn, -\rm]
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T sub \rt, \rn, \rm
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T ldr \rt, [\rt]
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.endm
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.macro ldr_post rt, rn, rm:vararg
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A ldr \rt, [\rn], \rm
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T ldr \rt, [\rn]
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T add \rn, \rn, \rm
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.endm
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.macro ldrc_pre cc, rt, rn, rm:vararg
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A ldr\cc \rt, [\rn, \rm]!
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T itt \cc
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T add\cc \rn, \rn, \rm
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T ldr\cc \rt, [\rn]
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.endm
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.macro ldrd_reg rt, rt2, rn, rm
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A ldrd \rt, \rt2, [\rn, \rm]
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T add \rt, \rn, \rm
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T ldrd \rt, \rt2, [\rt]
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.endm
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.macro ldrd_post rt, rt2, rn, rm
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A ldrd \rt, \rt2, [\rn], \rm
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T ldrd \rt, \rt2, [\rn]
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T add \rn, \rn, \rm
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.endm
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.macro ldrh_pre rt, rn, rm
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A ldrh \rt, [\rn, \rm]!
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T add \rn, \rn, \rm
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T ldrh \rt, [\rn]
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.endm
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.macro ldrh_dpre rt, rn, rm
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A ldrh \rt, [\rn, -\rm]!
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T sub \rn, \rn, \rm
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T ldrh \rt, [\rn]
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.endm
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.macro ldrh_post rt, rn, rm
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A ldrh \rt, [\rn], \rm
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T ldrh \rt, [\rn]
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T add \rn, \rn, \rm
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.endm
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.macro ldrb_post rt, rn, rm
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A ldrb \rt, [\rn], \rm
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T ldrb \rt, [\rn]
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T add \rn, \rn, \rm
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.endm
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.macro str_post rt, rn, rm:vararg
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A str \rt, [\rn], \rm
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T str \rt, [\rn]
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T add \rn, \rn, \rm
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.endm
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.macro strb_post rt, rn, rm:vararg
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A strb \rt, [\rn], \rm
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T strb \rt, [\rn]
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T add \rn, \rn, \rm
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.endm
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.macro strd_post rt, rt2, rn, rm
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A strd \rt, \rt2, [\rn], \rm
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T strd \rt, \rt2, [\rn]
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T add \rn, \rn, \rm
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.endm
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.macro strh_pre rt, rn, rm
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A strh \rt, [\rn, \rm]!
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T add \rn, \rn, \rm
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T strh \rt, [\rn]
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.endm
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.macro strh_dpre rt, rn, rm
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A strh \rt, [\rn, -\rm]!
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T sub \rn, \rn, \rm
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T strh \rt, [\rn]
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.endm
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.macro strh_post rt, rn, rm
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A strh \rt, [\rn], \rm
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T strh \rt, [\rn]
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T add \rn, \rn, \rm
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.endm
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.macro strh_dpost rt, rn, rm
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A strh \rt, [\rn], -\rm
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T strh \rt, [\rn]
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T sub \rn, \rn, \rm
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.endm
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#if HAVE_VFP_ARGS
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ELF .eabi_attribute 28, 1
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# define VFP
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# define NOVFP @
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#else
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# define VFP @
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# define NOVFP
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#endif
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#define GLUE(a, b) a ## b
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#define JOIN(a, b) GLUE(a, b)
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#define X(s) JOIN(EXTERN_ASM, s)
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