39bbd9c05e
This namespace has gone through the deprecation period and can now be removed. Change-Id: I476815491314f4222da43da75c91654b4f3d1228 Signed-off-by: Daniel R. Carvalho <odanrc@yahoo.com.br> Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/67374 Maintainer: Jason Lowe-Power <power.jg@gmail.com> Reviewed-by: Richard Cooper <richard.cooper@arm.com> Tested-by: kokoro <noreply+kokoro@google.com>
117 lines
3.7 KiB
C++
117 lines
3.7 KiB
C++
/*
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* Copyright 2019 Google, Inc.
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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
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (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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*/
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#ifndef __SIM_SYSCALL_ABI_HH__
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#define __SIM_SYSCALL_ABI_HH__
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#include "base/bitfield.hh"
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#include "base/types.hh"
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#include "cpu/thread_context.hh"
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#include "sim/guest_abi.hh"
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#include "sim/syscall_return.hh"
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namespace gem5
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{
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class SyscallDesc;
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struct GenericSyscallABI
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{
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using State = int;
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};
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struct GenericSyscallABI64 : public GenericSyscallABI
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{
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using UintPtr = uint64_t;
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};
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struct GenericSyscallABI32 : public GenericSyscallABI
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{
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using UintPtr = uint32_t;
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// Is this argument too big for a single register?
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template <typename T, typename Enabled=void>
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struct IsWide : public std::false_type {};
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template <typename T>
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struct IsWide<T, std::enable_if_t<(sizeof(T) > sizeof(UintPtr))>> :
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public std::true_type
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{};
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template <typename T>
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static constexpr bool IsWideV = IsWide<T>::value;
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// Read two registers and merge them into one value.
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static uint64_t
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mergeRegs(ThreadContext *tc, const RegId &low_id, const RegId &high_id)
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{
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RegVal low = tc->getReg(low_id);
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RegVal high = tc->getReg(high_id);
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return insertBits(low, 63, 32, high);
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}
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};
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namespace guest_abi
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{
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// For 64 bit systems, return syscall args directly.
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template <typename ABI, typename Arg>
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struct Argument<ABI, Arg,
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typename std::enable_if_t<
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std::is_base_of_v<GenericSyscallABI64, ABI> &&
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std::is_integral_v<Arg>>>
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{
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static Arg
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get(ThreadContext *tc, typename ABI::State &state)
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{
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panic_if(state >= ABI::ArgumentRegs.size(),
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"Ran out of syscall argument registers.");
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return tc->getReg(ABI::ArgumentRegs[state++]);
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}
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};
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// For 32 bit systems, return small enough syscall args directly. Large
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// arguments aren't handled generically.
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template <typename ABI, typename Arg>
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struct Argument<ABI, Arg,
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typename std::enable_if_t<std::is_integral_v<Arg> &&
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!ABI::template IsWideV<Arg>>>
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{
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static Arg
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get(ThreadContext *tc, typename ABI::State &state)
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{
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panic_if(state >= ABI::ArgumentRegs.size(),
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"Ran out of syscall argument registers.");
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return bits(tc->getReg(ABI::ArgumentRegs[state++]), 31, 0);
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}
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};
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} // namespace guest_abi
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} // namespace gem5
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#endif // __SIM_SYSCALL_ABI_HH__
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