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197 lines
6.0 KiB
197 lines
6.0 KiB
/**************************************************************************** |
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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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/* override fpu so that NEON instructions are rejected */ |
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#if 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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const register_init, align=3 |
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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_fpscr |
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.asciz "failed to preserve register FPSCR, changed bits: %x" |
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error_message_gpr: |
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.asciz "failed to preserve register r%d" |
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error_message_vfp: |
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.asciz "failed to preserve register d%d" |
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error_message_stack: |
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.asciz "failed to preserve stack" |
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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 - 4) |
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@ Align the used stack space to 8 to preserve the stack alignment. |
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@ +8 for stack canary reference. |
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#define ARG_STACK_A (((ARG_STACK + pushed + 7) & ~7) - pushed + 8) |
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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_A |
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.equ pos, 0 |
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.rept MAX_ARGS-4 |
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ldr r12, [sp, #ARG_STACK_A + 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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@ For stack overflows, the callee is free to overwrite the parameters |
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@ that were passed on the stack (if any), so we can only check after |
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@ that point. First figure out how many parameters the function |
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@ really took on the stack: |
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ldr r12, [sp, #ARG_STACK_A + pushed + 8 + 4*(MAX_ARGS-4)] |
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@ Load the first non-parameter value from the stack, that should be |
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@ left untouched by the function. Store a copy of it inverted, so that |
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@ e.g. overwriting everything with zero would be noticed. |
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ldr r12, [sp, r12, lsl #2] |
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mvn r12, r12 |
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str r12, [sp, #ARG_STACK_A - 4] |
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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_A + pushed] |
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@ Call the target function |
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blx r12 |
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@ Load the number of stack parameters, stack canary and its reference |
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ldr r12, [sp, #ARG_STACK_A + pushed + 8 + 4*(MAX_ARGS-4)] |
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ldr r2, [sp, r12, lsl #2] |
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ldr r3, [sp, #ARG_STACK_A - 4] |
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add sp, sp, #ARG_STACK_A |
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push {r0, r1} |
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mvn r3, r3 |
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cmp r2, r3 |
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bne 5f |
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movrel r12, register_init |
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.ifc \variant, vfp |
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.macro check_reg_vfp, dreg, offset |
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ldrd r2, r3, [r12, #8 * (\offset)] |
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vmov r0, lr, \dreg |
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eor r2, r2, r0 |
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eor r3, r3, lr |
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orrs r2, r2, r3 |
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bne 4f |
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.endm |
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.irp n, 8, 9, 10, 11, 12, 13, 14, 15 |
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@ keep track of the checked double/SIMD register |
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mov r1, #\n |
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check_reg_vfp d\n, \n-8 |
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.endr |
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.purgem check_reg_vfp |
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fmrx r1, FPSCR |
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ldr r3, [sp, #8] |
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eor r1, r1, r3 |
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@ Ignore changes in bits 0-4 and 7 |
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bic r1, r1, #0x9f |
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@ Ignore changes in the topmost 5 bits |
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bics r1, r1, #0xf8000000 |
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bne 3f |
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.endif |
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@ keep track of the checked GPR |
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mov r1, #4 |
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.macro check_reg reg1, reg2= |
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ldrd r2, r3, [r12], #8 |
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eors r2, r2, \reg1 |
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bne 2f |
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add r1, r1, #1 |
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.ifnb \reg2 |
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eors r3, r3, \reg2 |
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bne 2f |
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.endif |
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add r1, r1, #1 |
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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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b 0f |
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5: |
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movrel r0, error_message_stack |
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b 1f |
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4: |
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movrel r0, error_message_vfp |
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b 1f |
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3: |
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movrel r0, error_message_fpscr |
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b 1f |
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2: |
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movrel r0, error_message_gpr |
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1: |
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bl 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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