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0f35e36b7f
Refer to the README.md and LICENCE files for details. Change-Id: I922914f4e7da7cb939a8054cded11feb9ea51a86
105 lines
3.5 KiB
C++
105 lines
3.5 KiB
C++
// Copyright 2014, 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 GenerateSwapInt32(MacroAssembler* masm) {
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{
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// In this scope the register x2 will be used by the macro-assembler
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// as the stack pointer (via peek, poke, push, etc).
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const Register old_stack_pointer = __ StackPointer();
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__ Mov(x2, __ StackPointer());
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__ SetStackPointer(x2);
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// This call to Claim is not 16-byte aligned and would have failed
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// if the current stack pointer was sp.
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__ Claim(8);
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__ Poke(w0, 0);
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__ Poke(w1, 4);
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__ Peek(w1, 0);
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__ Peek(w0, 4);
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__ Drop(8);
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// Even if we didn't use the system stack pointer, sp might have been
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// modified because the ABI forbids access to memory below the stack
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// pointer.
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__ Mov(old_stack_pointer, __ StackPointer());
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__ SetStackPointer(old_stack_pointer);
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}
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// The stack pointer has now been switched back to sp.
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__ Ret();
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}
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#ifndef TEST_EXAMPLES
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#ifdef VIXL_INCLUDE_SIMULATOR
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int main(void) {
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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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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 swap_int32;
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masm.Bind(&swap_int32);
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GenerateSwapInt32(&masm);
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masm.FinalizeCode();
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// Run the example function.
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simulator.set_wreg(0, 0x11111111);
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simulator.set_wreg(1, 0x22222222);
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// clang-format off
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printf("Before swap_int32:\n"
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"x0 = 0x%" PRIx32 "\n"
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"x1 = 0x%" PRIx32 "\n",
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simulator.wreg(0), simulator.wreg(1));
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// clang-format on
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simulator.RunFrom(masm.GetLabelAddress<Instruction*>(&swap_int32));
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// clang-format off
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printf("After swap_int32:\n"
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"x0 = 0x%" PRIx32 "\n"
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"x1 = 0x%" PRIx32 "\n",
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simulator.wreg(0), simulator.wreg(1));
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// clang-format on
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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
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#endif // TEST_EXAMPLES
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