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107 lines
3.8 KiB
107 lines
3.8 KiB
// Copyright 2014, VIXL authors
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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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using namespace vixl;
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using namespace vixl::aarch64;
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#define __ masm->
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void GenerateCheckBounds(MacroAssembler* masm) {
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// uint64_t check_bounds(uint64_t value, uint64_t low, uint64_t high)
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// Argument locations:
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// value -> x0
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// low -> x1
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// high -> x2
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// First we compare 'value' with the 'low' bound. If x1 <= x0 the N flag will
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// be cleared. This configuration can be checked with the 'pl' condition.
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__ Cmp(x0, x1);
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// Now we will compare 'value' and 'high' (x0 and x2) but only if the 'pl'
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// condition is verified. If the condition is not verified, we will clear
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// all the flags except the carry one (C flag).
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__ Ccmp(x0, x2, CFlag, pl);
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// We set x0 to 1 only if the 'ls' condition is satisfied.
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// 'ls' performs the following test: !(C==1 && Z==0). If the previous
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// comparison has been skipped we have C==1 and Z==0, so the 'ls' test
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// will fail and x0 will be set to 0.
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// Otherwise if the previous comparison occurred, x0 will be set to 1
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// only if x0 is less than or equal to x2.
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__ Cset(x0, ls);
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__ Ret();
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}
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#ifndef TEST_EXAMPLES
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#ifdef VIXL_INCLUDE_SIMULATOR_AARCH64
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void run_function(Simulator* simulator,
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Instruction* function,
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uint64_t value,
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uint64_t low,
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uint64_t high) {
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simulator->WriteXRegister(0, value);
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simulator->WriteXRegister(1, low);
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simulator->WriteXRegister(2, high);
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simulator->RunFrom(function);
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printf("%" PRIu64 " %s between %" PRIu64 " and %" PRIu64 "\n",
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value,
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simulator->ReadXRegister(0) ? "is" : "is not",
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low,
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high);
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simulator->ResetState();
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}
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int main(void) {
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MacroAssembler masm;
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Decoder decoder;
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Simulator simulator(&decoder);
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// Generate the code for the example function.
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Label check_bounds;
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masm.Bind(&check_bounds);
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GenerateCheckBounds(&masm);
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masm.FinalizeCode();
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// Run the example function.
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Instruction* function = masm.GetLabelAddress<Instruction*>(&check_bounds);
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run_function(&simulator, function, 546, 50, 1000);
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run_function(&simulator, function, 62, 100, 200);
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run_function(&simulator, function, 200, 100, 200);
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return 0;
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}
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#else
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// Without the simulator there is nothing to test.
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int main(void) { return 0; }
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#endif // VIXL_INCLUDE_SIMULATOR_AARCH64
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#endif // TEST_EXAMPLES
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