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/*
* Copyright 2020 Google Inc.
*
* 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
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* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders 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 AND 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
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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*/
#ifndef __ARCH_ARM_REG_ABI_HH__
#define __ARCH_ARM_REG_ABI_HH__
#include <vector>
#include "base/logging.hh"
#include "sim/syscall_abi.hh"
namespace gem5
{
namespace ArmISA
{
struct RegABI32 : public GenericSyscallABI32
{
static const std::vector<RegId> ArgumentRegs;
};
struct RegABI64 : public GenericSyscallABI64
{
static const std::vector<RegId> ArgumentRegs;
};
} // namespace ArmISA
namespace guest_abi
{
template <typename ABI, typename Arg>
struct Argument<ABI, Arg,
typename std::enable_if_t<
std::is_base_of_v<ArmISA::RegABI32, ABI> &&
std::is_integral_v<Arg> &&
ABI::template IsWideV<Arg>>>
{
static Arg
get(ThreadContext *tc, typename ABI::State &state)
{
// 64 bit arguments are passed starting in an even register.
if (state % 2)
state++;
panic_if(state + 1 >= ABI::ArgumentRegs.size(),
"Ran out of syscall argument registers.");
auto low = ABI::ArgumentRegs[state++];
auto high = ABI::ArgumentRegs[state++];
return (Arg)ABI::mergeRegs(tc, low, high);
}
};
} // namespace guest_abi
} // namespace gem5
#endif // __ARCH_ARM_REG_ABI_HH__