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ed7d73355e
Also fill x8-x17 with garbage before calling the function. Figure out the number of stack parameters and make sure that the value on the stack after those is untouched. Signed-off-by: Martin Storsjö <martin@martin.st>
199 lines
6.8 KiB
ArmAsm
199 lines
6.8 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/aarch64/asm.S"
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const register_init, align=4
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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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.quad 0x1a1b2550a612b48c
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.quad 0x79445c159ce79064
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.quad 0x2eed899d5a28ddcd
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.quad 0x86b2536fcd8cf636
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.quad 0xb0856806085e7943
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.quad 0x3f2bf84fc0fcca4e
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.quad 0xacbd382dcf5b8de2
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.quad 0xd229e1f5b281303f
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.quad 0x71aeaff20b095fd9
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.quad 0xab63e2e11fa38ed9
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endconst
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const error_message_register
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.asciz "failed to preserve register"
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error_message_stack:
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.asciz "stack clobbered"
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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 CLOBBER_STACK ((8*MAX_ARGS + 15) & ~15)
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function checkasm_stack_clobber, export=1
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mov x3, sp
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mov x2, #CLOBBER_STACK
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1:
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stp x0, x1, [sp, #-16]!
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subs x2, x2, #16
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b.gt 1b
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mov sp, x3
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ret
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endfunc
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// + 16 for stack canary reference
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#define ARG_STACK ((8*(MAX_ARGS - 8) + 15) & ~15 + 16)
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function checkasm_checked_call, export=1
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stp x29, x30, [sp, #-16]!
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mov x29, sp
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stp x19, x20, [sp, #-16]!
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stp x21, x22, [sp, #-16]!
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stp x23, x24, [sp, #-16]!
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stp x25, x26, [sp, #-16]!
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stp x27, x28, [sp, #-16]!
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stp d8, d9, [sp, #-16]!
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stp d10, d11, [sp, #-16]!
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stp d12, d13, [sp, #-16]!
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stp d14, d15, [sp, #-16]!
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movrel x9, register_init
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ldp d8, d9, [x9], #16
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ldp d10, d11, [x9], #16
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ldp d12, d13, [x9], #16
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ldp d14, d15, [x9], #16
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ldp x19, x20, [x9], #16
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ldp x21, x22, [x9], #16
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ldp x23, x24, [x9], #16
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ldp x25, x26, [x9], #16
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ldp x27, x28, [x9], #16
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sub sp, sp, #ARG_STACK
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.equ pos, 0
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.rept MAX_ARGS-8
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// Skip the first 8 args, that are loaded into registers
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ldr x9, [x29, #16 + 8*8 + pos]
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str x9, [sp, #pos]
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.equ pos, pos + 8
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.endr
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// Fill x8-x17 with garbage. This doesn't have to be preserved,
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// but avoids relying on them having any particular value.
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movrel x9, register_init
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ldp x10, x11, [x9], #32
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ldp x12, x13, [x9], #32
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ldp x14, x15, [x9], #32
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ldp x16, x17, [x9], #32
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ldp x8, x9, [x9]
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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 w2, [x29, #16 + 8*8 + (MAX_ARGS-8)*8]
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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 x2, [sp, x2, lsl #3]
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mvn x2, x2
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str x2, [sp, #ARG_STACK-8]
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// Load the in-register arguments
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mov x12, x0
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ldp x0, x1, [x29, #16]
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ldp x2, x3, [x29, #32]
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ldp x4, x5, [x29, #48]
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ldp x6, x7, [x29, #64]
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// Call the target function
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blr x12
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// Load the number of stack parameters, stack canary and its reference
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ldr w2, [x29, #16 + 8*8 + (MAX_ARGS-8)*8]
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ldr x2, [sp, x2, lsl #3]
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ldr x3, [sp, #ARG_STACK-8]
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add sp, sp, #ARG_STACK
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stp x0, x1, [sp, #-16]!
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mvn x3, x3
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cmp x2, x3
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b.ne 2f
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movrel x9, register_init
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movi v3.8h, #0
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.macro check_reg_neon reg1, reg2
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ldr q1, [x9], #16
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uzp1 v2.2d, v\reg1\().2d, v\reg2\().2d
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eor v1.16b, v1.16b, v2.16b
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orr v3.16b, v3.16b, v1.16b
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.endm
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check_reg_neon 8, 9
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check_reg_neon 10, 11
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check_reg_neon 12, 13
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check_reg_neon 14, 15
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uqxtn v3.8b, v3.8h
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umov x3, v3.d[0]
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.macro check_reg reg1, reg2
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ldp x0, x1, [x9], #16
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eor x0, x0, \reg1
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eor x1, x1, \reg2
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orr x3, x3, x0
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orr x3, x3, x1
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.endm
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check_reg x19, x20
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check_reg x21, x22
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check_reg x23, x24
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check_reg x25, x26
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check_reg x27, x28
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cbz x3, 0f
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movrel x0, error_message_register
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b 1f
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2:
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movrel x0, error_message_stack
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1:
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bl X(checkasm_fail_func)
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0:
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ldp x0, x1, [sp], #16
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ldp d14, d15, [sp], #16
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ldp d12, d13, [sp], #16
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ldp d10, d11, [sp], #16
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ldp d8, d9, [sp], #16
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ldp x27, x28, [sp], #16
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ldp x25, x26, [sp], #16
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ldp x23, x24, [sp], #16
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ldp x21, x22, [sp], #16
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ldp x19, x20, [sp], #16
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ldp x29, x30, [sp], #16
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ret
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endfunc
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