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0f35e36b7f
Refer to the README.md and LICENCE files for details. Change-Id: I922914f4e7da7cb939a8054cded11feb9ea51a86
107 lines
3.4 KiB
C++
107 lines
3.4 KiB
C++
// Copyright 2015, ARM Limited
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// * Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// * Neither the name of ARM Limited nor the names of its contributors may be
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// used to endorse or promote products derived from this software without
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// specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS CONTRIBUTORS "AS IS" AND
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// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
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// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "examples.h"
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#define BUF_SIZE (4096)
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#define __ masm->
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void GenerateCrc32(MacroAssembler* masm) {
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// uint32_t crc32(const char *msg, size_t length)
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// Argument location:
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// msg (pointer) -> x0
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// length (integer) -> x1
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// This example computes CRC32CB on an input array of a given size
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// and returns the resulting checksum in w0.
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Label loop, end;
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// Move input array to temp register so we can re-use w0 as return register.
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__ Mov(x2, x0);
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// Initial remainder for the checksum. If length=0, then this value will be
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// returned.
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__ Mov(w0, 0xffffffff);
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// Loop for iterating through the array, starting at msg[0].
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__ Bind(&loop);
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// If no more elements to process, then exit function.
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__ Cbz(x1, &end);
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__ Sub(x1, x1, 1);
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// Compute checksum for msg[i].
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__ Ldrb(w3, MemOperand(x2, 1, PostIndex));
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__ Crc32b(w0, w0, w3);
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__ B(&loop);
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__ Bind(&end);
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__ Ret();
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}
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#ifndef TEST_EXAMPLES
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void runExample(const char* msg) {
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// Create and initialize the assembler and the simulator.
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byte assm_buf[BUF_SIZE];
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MacroAssembler masm(assm_buf, BUF_SIZE);
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// Generate the code for the example function.
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Label func;
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masm.Bind(&func);
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GenerateCrc32(&masm);
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masm.FinalizeCode();
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#ifdef VIXL_INCLUDE_SIMULATOR
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// Run example function in the simulator.
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uintptr_t msg_addr = reinterpret_cast<uintptr_t>(msg);
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size_t msg_size = strlen(msg);
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Decoder decoder;
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Simulator simulator(&decoder);
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simulator.set_xreg(0, msg_addr);
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simulator.set_xreg(1, msg_size);
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simulator.RunFrom(masm.GetLabelAddress<Instruction*>(&func));
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printf("crc32(\"%s\")=0x%x\n", msg, simulator.wreg(0));
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#else
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// Run example function natively.
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printf("Not yet implemented.\n");
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USE(msg);
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#endif // VIXL_INCLUDE_SIMULATOR
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}
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int main(void) {
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runExample("Hello World!");
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runExample("do");
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runExample("1");
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runExample("");
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return 0;
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}
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#endif // TEST_EXAMPLES
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