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ffmpeg/tests/checkasm/arm/checkasm.S

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ArmAsm
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checkasm: Check register clobbering on arm Use two separate functions, depending on whether VFP/NEON is available. This is set to require armv5te - it uses blx, which is only available since armv5t, but we don't have a separate configure item for that. (It also uses ldrd, which requires armv5te, but this could be avoided if necessary.) Signed-off-by: Martin Storsjö <martin@martin.st>
2015-12-30 21:46:06 +00:00
/****************************************************************************
* Assembly testing and benchmarking tool
* Copyright (c) 2015 Martin Storsjo
* Copyright (c) 2015 Janne Grunau
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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.
*****************************************************************************/
#include "libavutil/arm/asm.S"
checkasm/arm: align the clobber check data properly for ldrd Should fix the SIGBUS in the armv7-linux-clang-3.7 fate target.
2016-07-10 11:23:13 +00:00
const register_init, align=3
checkasm: Check register clobbering on arm Use two separate functions, depending on whether VFP/NEON is available. This is set to require armv5te - it uses blx, which is only available since armv5t, but we don't have a separate configure item for that. (It also uses ldrd, which requires armv5te, but this could be avoided if necessary.) Signed-off-by: Martin Storsjö <martin@martin.st>
2015-12-30 21:46:06 +00:00
.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
@ max number of args used by any asm function.
#define MAX_ARGS 15
#define ARG_STACK 4*(MAX_ARGS - 2)
checkasm/arm: preserve the stack alignment checkasm_checked_call The stack used by checkasm_checked_call_vfp was a multiple of 4 when the checked function is called. AAPCS requires a double word (8 byte) aligned stack public interfaces. Since both calls are public interfaces the stack is misaligned when the checked is called. Might fix the SIGBUS error in the armv7-linux-clang-3.7 fate config.
2016-07-12 20:46:43 +00:00
@ align the used stack space to 8 to preserve the stack alignment
#define ARG_STACK_A (((ARG_STACK + pushed + 7) & ~7) - pushed)
checkasm: Check register clobbering on arm Use two separate functions, depending on whether VFP/NEON is available. This is set to require armv5te - it uses blx, which is only available since armv5t, but we don't have a separate configure item for that. (It also uses ldrd, which requires armv5te, but this could be avoided if necessary.) Signed-off-by: Martin Storsjö <martin@martin.st>
2015-12-30 21:46:06 +00:00
.macro clobbercheck variant
.equ pushed, 4*9
function checkasm_checked_call_\variant, export=1
push {r4-r11, lr}
.ifc \variant, vfp
vpush {d8-d15}
fmrx r4, FPSCR
push {r4}
.equ pushed, pushed + 16*4 + 4
.endif
movrel r12, register_init
.ifc \variant, vfp
vldm r12, {d8-d15}
.endif
ldm r12, {r4-r11}
checkasm/arm: preserve the stack alignment checkasm_checked_call The stack used by checkasm_checked_call_vfp was a multiple of 4 when the checked function is called. AAPCS requires a double word (8 byte) aligned stack public interfaces. Since both calls are public interfaces the stack is misaligned when the checked is called. Might fix the SIGBUS error in the armv7-linux-clang-3.7 fate config.
2016-07-12 20:46:43 +00:00
sub sp, sp, #ARG_STACK_A
checkasm: Check register clobbering on arm Use two separate functions, depending on whether VFP/NEON is available. This is set to require armv5te - it uses blx, which is only available since armv5t, but we don't have a separate configure item for that. (It also uses ldrd, which requires armv5te, but this could be avoided if necessary.) Signed-off-by: Martin Storsjö <martin@martin.st>
2015-12-30 21:46:06 +00:00
.equ pos, 0
.rept MAX_ARGS-2
checkasm/arm: preserve the stack alignment checkasm_checked_call The stack used by checkasm_checked_call_vfp was a multiple of 4 when the checked function is called. AAPCS requires a double word (8 byte) aligned stack public interfaces. Since both calls are public interfaces the stack is misaligned when the checked is called. Might fix the SIGBUS error in the armv7-linux-clang-3.7 fate config.
2016-07-12 20:46:43 +00:00
ldr r12, [sp, #ARG_STACK_A + pushed + 8 + pos]
checkasm: Check register clobbering on arm Use two separate functions, depending on whether VFP/NEON is available. This is set to require armv5te - it uses blx, which is only available since armv5t, but we don't have a separate configure item for that. (It also uses ldrd, which requires armv5te, but this could be avoided if necessary.) Signed-off-by: Martin Storsjö <martin@martin.st>
2015-12-30 21:46:06 +00:00
str r12, [sp, #pos]
.equ pos, pos + 4
.endr
mov r12, r0
mov r0, r2
mov r1, r3
checkasm/arm: preserve the stack alignment checkasm_checked_call The stack used by checkasm_checked_call_vfp was a multiple of 4 when the checked function is called. AAPCS requires a double word (8 byte) aligned stack public interfaces. Since both calls are public interfaces the stack is misaligned when the checked is called. Might fix the SIGBUS error in the armv7-linux-clang-3.7 fate config.
2016-07-12 20:46:43 +00:00
ldrd r2, r3, [sp, #ARG_STACK_A + pushed]
checkasm: Check register clobbering on arm Use two separate functions, depending on whether VFP/NEON is available. This is set to require armv5te - it uses blx, which is only available since armv5t, but we don't have a separate configure item for that. (It also uses ldrd, which requires armv5te, but this could be avoided if necessary.) Signed-off-by: Martin Storsjö <martin@martin.st>
2015-12-30 21:46:06 +00:00
blx r12
checkasm/arm: preserve the stack alignment checkasm_checked_call The stack used by checkasm_checked_call_vfp was a multiple of 4 when the checked function is called. AAPCS requires a double word (8 byte) aligned stack public interfaces. Since both calls are public interfaces the stack is misaligned when the checked is called. Might fix the SIGBUS error in the armv7-linux-clang-3.7 fate config.
2016-07-12 20:46:43 +00:00
add sp, sp, #ARG_STACK_A
checkasm: Check register clobbering on arm Use two separate functions, depending on whether VFP/NEON is available. This is set to require armv5te - it uses blx, which is only available since armv5t, but we don't have a separate configure item for that. (It also uses ldrd, which requires armv5te, but this could be avoided if necessary.) Signed-off-by: Martin Storsjö <martin@martin.st>
2015-12-30 21:46:06 +00:00
push {r0, r1}
movrel r12, register_init
mov r3, #0
.ifc \variant, vfp
.macro check_reg_vfp, dreg, inc=8
ldrd r0, r1, [r12], #\inc
vmov r2, lr, \dreg
eor r0, r0, r2
eor r1, r1, lr
orr r3, r3, r0
orr r3, r3, r1
.endm
.irp n, 8, 9, 10, 11, 12, 13, 14
check_reg_vfp d\n
.endr
check_reg_vfp d15, -56
.purgem check_reg_vfp
fmrx r0, FPSCR
ldr r1, [sp, #8]
eor r0, r0, r1
@ Ignore changes in the topmost 5 bits
lsl r0, r0, #5
orr r3, r3, r0
.endif
.macro check_reg reg1, reg2=
ldrd r0, r1, [r12], #8
eor r0, r0, \reg1
orrs r3, r3, r0
.ifnb \reg2
eor r1, r1, \reg2
orrs r3, r3, r1
.endif
.endm
check_reg r4, r5
check_reg r6, r7
@ r9 is a volatile register in the ios ABI
#ifdef __APPLE__
check_reg r8
#else
check_reg r8, r9
#endif
check_reg r10, r11
.purgem check_reg
beq 0f
movrel r0, error_message
blx X(checkasm_fail_func)
0:
pop {r0, r1}
.ifc \variant, vfp
pop {r2}
fmxr FPSCR, r2
vpop {d8-d15}
.endif
pop {r4-r11, pc}
endfunc
.endm
#if HAVE_VFP || HAVE_NEON
clobbercheck vfp
#endif
clobbercheck novfp