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// Copyright 2014, VIXL authors
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// * Neither the name of ARM Limited nor the names of its contributors may be
// used to endorse or promote products derived from this software without
// specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "examples.h"
#define __ masm->
void GenerateSwapInt32(MacroAssembler* masm) {
{
// In this scope the register x2 will be used by the macro-assembler
// as the stack pointer (via peek, poke, push, etc).
const Register old_stack_pointer = __ StackPointer();
__ Mov(x2, __ StackPointer());
__ SetStackPointer(x2);
// This call to Claim is not 16-byte aligned and would have failed
// if the current stack pointer was sp.
__ Claim(8);
__ Poke(w0, 0);
__ Poke(w1, 4);
__ Peek(w1, 0);
__ Peek(w0, 4);
__ Drop(8);
// Even if we didn't use the system stack pointer, sp might have been
// modified because the ABI forbids access to memory below the stack
// pointer.
__ Mov(old_stack_pointer, __ StackPointer());
__ SetStackPointer(old_stack_pointer);
}
// The stack pointer has now been switched back to sp.
__ Ret();
}
#ifndef TEST_EXAMPLES
#ifdef VIXL_INCLUDE_SIMULATOR
int main(void) {
MacroAssembler masm;
Decoder decoder;
Simulator simulator(&decoder);
// Generate the code for the example function.
Label swap_int32;
masm.Bind(&swap_int32);
GenerateSwapInt32(&masm);
masm.FinalizeCode();
// Run the example function.
simulator.WriteWRegister(0, 0x11111111);
simulator.WriteWRegister(1, 0x22222222);
// clang-format off
printf("Before swap_int32:\n"
"x0 = 0x%" PRIx32 "\n"
"x1 = 0x%" PRIx32 "\n",
simulator.ReadWRegister(0), simulator.ReadWRegister(1));
// clang-format on
simulator.RunFrom(masm.GetLabelAddress<Instruction*>(&swap_int32));
// clang-format off
printf("After swap_int32:\n"
"x0 = 0x%" PRIx32 "\n"
"x1 = 0x%" PRIx32 "\n",
simulator.ReadWRegister(0), simulator.ReadWRegister(1));
// clang-format on
return 0;
}
#else
// Without the simulator there is nothing to test.
int main(void) { return 0; }
#endif // VIXL_INCLUDE_SIMULATOR
#endif // TEST_EXAMPLES
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