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51992fa80af477097ece177610ec9e05aef03df4
gem5/src/arch/arm/process.cc
Andreas Sandberg 51992fa80a base, sim: Make ByteOrder into a ScopedEnum accessible to Python 
There is currently no good way of passing a byte order as a Param
since the ByteOrder type is defined in C++. Make this into a generated
ScopedEnum that can be used in Params.

Change-Id: I990f402340c17c4e0799de57df19516ae61794d4
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/33174
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Gabe Black <gabeblack@google.com>
2020-09-08 16:24:00 +00:00

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/*
* Copyright (c) 2010, 2012, 2017-2018 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
* not be construed as granting a license to any other intellectual
* property including but not limited to intellectual property relating
* to a hardware implementation of the functionality of the software
* licensed hereunder. You may use the software subject to the license
* terms below provided that you ensure that this notice is replicated
* unmodified and in its entirety in all distributions of the software,
* modified or unmodified, in source code or in binary form.
*
* Copyright (c) 2007-2008 The Florida State University
* 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 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
* 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 "arch/arm/process.hh"
#include "arch/arm/isa_traits.hh"
#include "arch/arm/types.hh"
#include "base/loader/elf_object.hh"
#include "base/loader/object_file.hh"
#include "base/logging.hh"
#include "cpu/thread_context.hh"
#include "debug/Stack.hh"
#include "mem/page_table.hh"
#include "params/Process.hh"
#include "sim/aux_vector.hh"
#include "sim/byteswap.hh"
#include "sim/process_impl.hh"
#include "sim/syscall_return.hh"
#include "sim/system.hh"
using namespace std;
using namespace ArmISA;
ArmProcess::ArmProcess(ProcessParams *params, ::Loader::ObjectFile *objFile,
::Loader::Arch _arch)
: Process(params,
new EmulationPageTable(params->name, params->pid, PageBytes),
objFile),
arch(_arch)
{
fatal_if(params->useArchPT, "Arch page tables not implemented.");
}
ArmProcess32::ArmProcess32(ProcessParams *params,
::Loader::ObjectFile *objFile, ::Loader::Arch _arch)
: ArmProcess(params, objFile, _arch)
{
Addr brk_point = roundUp(image.maxAddr(), PageBytes);
Addr stack_base = 0xbf000000L;
Addr max_stack_size = 8 * 1024 * 1024;
Addr next_thread_stack_base = stack_base - max_stack_size;
Addr mmap_end = 0x40000000L;
memState = make_shared<MemState>(this, brk_point, stack_base,
max_stack_size, next_thread_stack_base,
mmap_end);
}
ArmProcess64::ArmProcess64(
ProcessParams *params, ::Loader::ObjectFile *objFile,
::Loader::Arch _arch)
: ArmProcess(params, objFile, _arch)
{
Addr brk_point = roundUp(image.maxAddr(), PageBytes);
Addr stack_base = 0x7fffff0000L;
Addr max_stack_size = 8 * 1024 * 1024;
Addr next_thread_stack_base = stack_base - max_stack_size;
Addr mmap_end = 0x4000000000L;
memState = make_shared<MemState>(this, brk_point, stack_base,
max_stack_size, next_thread_stack_base,
mmap_end);
}
void
ArmProcess32::initState()
{
Process::initState();
argsInit<uint32_t>(PageBytes, INTREG_SP);
for (auto id: contextIds) {
ThreadContext *tc = system->threads[id];
CPACR cpacr = tc->readMiscReg(MISCREG_CPACR);
// Enable the floating point coprocessors.
cpacr.cp10 = 0x3;
cpacr.cp11 = 0x3;
tc->setMiscReg(MISCREG_CPACR, cpacr);
// Generically enable floating point support.
FPEXC fpexc = tc->readMiscReg(MISCREG_FPEXC);
fpexc.en = 1;
tc->setMiscReg(MISCREG_FPEXC, fpexc);
}
}
void
ArmProcess64::initState()
{
Process::initState();
argsInit<uint64_t>(PageBytes, INTREG_SP0);
for (auto id: contextIds) {
ThreadContext *tc = system->threads[id];
CPSR cpsr = tc->readMiscReg(MISCREG_CPSR);
cpsr.mode = MODE_EL0T;
tc->setMiscReg(MISCREG_CPSR, cpsr);
CPACR cpacr = tc->readMiscReg(MISCREG_CPACR_EL1);
// Enable the floating point coprocessors.
cpacr.cp10 = 0x3;
cpacr.cp11 = 0x3;
// Enable SVE.
cpacr.zen = 0x3;
tc->setMiscReg(MISCREG_CPACR_EL1, cpacr);
// Generically enable floating point support.
FPEXC fpexc = tc->readMiscReg(MISCREG_FPEXC);
fpexc.en = 1;
tc->setMiscReg(MISCREG_FPEXC, fpexc);
}
}
uint32_t
ArmProcess32::armHwcapImpl() const
{
enum ArmCpuFeature {
Arm_Swp = 1 << 0,
Arm_Half = 1 << 1,
Arm_Thumb = 1 << 2,
Arm_26Bit = 1 << 3,
Arm_FastMult = 1 << 4,
Arm_Fpa = 1 << 5,
Arm_Vfp = 1 << 6,
Arm_Edsp = 1 << 7,
Arm_Java = 1 << 8,
Arm_Iwmmxt = 1 << 9,
Arm_Crunch = 1 << 10,
Arm_ThumbEE = 1 << 11,
Arm_Neon = 1 << 12,
Arm_Vfpv3 = 1 << 13,
Arm_Vfpv3d16 = 1 << 14
};
return Arm_Swp | Arm_Half | Arm_Thumb | Arm_FastMult |
Arm_Vfp | Arm_Edsp | Arm_ThumbEE | Arm_Neon |
Arm_Vfpv3 | Arm_Vfpv3d16;
}
uint32_t
ArmProcess64::armHwcapImpl() const
{
// In order to know what these flags mean, please refer to Linux
// /Documentation/arm64/elf_hwcaps.txt text file.
enum ArmCpuFeature {
Arm_Fp = 1 << 0,
Arm_Asimd = 1 << 1,
Arm_Evtstrm = 1 << 2,
Arm_Aes = 1 << 3,
Arm_Pmull = 1 << 4,
Arm_Sha1 = 1 << 5,
Arm_Sha2 = 1 << 6,
Arm_Crc32 = 1 << 7,
Arm_Atomics = 1 << 8,
Arm_Fphp = 1 << 9,
Arm_Asimdhp = 1 << 10,
Arm_Cpuid = 1 << 11,
Arm_Asimdrdm = 1 << 12,
Arm_Jscvt = 1 << 13,
Arm_Fcma = 1 << 14,
Arm_Lrcpc = 1 << 15,
Arm_Dcpop = 1 << 16,
Arm_Sha3 = 1 << 17,
Arm_Sm3 = 1 << 18,
Arm_Sm4 = 1 << 19,
Arm_Asimddp = 1 << 20,
Arm_Sha512 = 1 << 21,
Arm_Sve = 1 << 22,
Arm_Asimdfhm = 1 << 23,
Arm_Dit = 1 << 24,
Arm_Uscat = 1 << 25,
Arm_Ilrcpc = 1 << 26,
Arm_Flagm = 1 << 27
};
uint32_t hwcap = 0;
ThreadContext *tc = system->threads[contextIds[0]];
const AA64PFR0 pf_r0 = tc->readMiscReg(MISCREG_ID_AA64PFR0_EL1);
hwcap |= (pf_r0.fp == 0) ? Arm_Fp : 0;
hwcap |= (pf_r0.fp == 1) ? Arm_Fphp | Arm_Fp : 0;
hwcap |= (pf_r0.advsimd == 0) ? Arm_Asimd : 0;
hwcap |= (pf_r0.advsimd == 1) ? Arm_Asimdhp | Arm_Asimd : 0;
hwcap |= (pf_r0.sve >= 1) ? Arm_Sve : 0;
hwcap |= (pf_r0.dit >= 1) ? Arm_Dit : 0;
const AA64ISAR0 isa_r0 = tc->readMiscReg(MISCREG_ID_AA64ISAR0_EL1);
hwcap |= (isa_r0.aes >= 1) ? Arm_Aes : 0;
hwcap |= (isa_r0.aes >= 2) ? Arm_Pmull : 0;
hwcap |= (isa_r0.sha1 >= 1) ? Arm_Sha1 : 0;
hwcap |= (isa_r0.sha2 >= 1) ? Arm_Sha2 : 0;
hwcap |= (isa_r0.sha2 >= 2) ? Arm_Sha512 : 0;
hwcap |= (isa_r0.crc32 >= 1) ? Arm_Crc32 : 0;
hwcap |= (isa_r0.atomic >= 1) ? Arm_Atomics : 0;
hwcap |= (isa_r0.rdm >= 1) ? Arm_Asimdrdm : 0;
hwcap |= (isa_r0.sha3 >= 1) ? Arm_Sha3 : 0;
hwcap |= (isa_r0.sm3 >= 1) ? Arm_Sm3 : 0;
hwcap |= (isa_r0.sm4 >= 1) ? Arm_Sm4 : 0;
hwcap |= (isa_r0.dp >= 1) ? Arm_Asimddp : 0;
hwcap |= (isa_r0.fhm >= 1) ? Arm_Asimdfhm : 0;
hwcap |= (isa_r0.ts >= 1) ? Arm_Flagm : 0;
const AA64ISAR1 isa_r1 = tc->readMiscReg(MISCREG_ID_AA64ISAR1_EL1);
hwcap |= (isa_r1.dpb >= 1) ? Arm_Dcpop : 0;
hwcap |= (isa_r1.jscvt >= 1) ? Arm_Jscvt : 0;
hwcap |= (isa_r1.fcma >= 1) ? Arm_Fcma : 0;
hwcap |= (isa_r1.lrcpc >= 1) ? Arm_Lrcpc : 0;
hwcap |= (isa_r1.lrcpc >= 2) ? Arm_Ilrcpc : 0;
const AA64MMFR2 mm_fr2 = tc->readMiscReg(MISCREG_ID_AA64MMFR2_EL1);
hwcap |= (mm_fr2.at >= 1) ? Arm_Uscat : 0;
return hwcap;
}
template <class IntType>
void
ArmProcess::argsInit(int pageSize, IntRegIndex spIndex)
{
int intSize = sizeof(IntType);
std::vector<AuxVector<IntType>> auxv;
string filename;
if (argv.size() < 1)
filename = "";
else
filename = argv[0];
//We want 16 byte alignment
uint64_t align = 16;
//Setup the auxilliary vectors. These will already have endian conversion.
//Auxilliary vectors are loaded only for elf formatted executables.
auto *elfObject = dynamic_cast<::Loader::ElfObject *>(objFile);
if (elfObject) {
if (objFile->getOpSys() == ::Loader::Linux) {
IntType features = armHwcap<IntType>();
//Bits which describe the system hardware capabilities
//XXX Figure out what these should be
auxv.emplace_back(M5_AT_HWCAP, features);
//Frequency at which times() increments
auxv.emplace_back(M5_AT_CLKTCK, 0x64);
//Whether to enable "secure mode" in the executable
auxv.emplace_back(M5_AT_SECURE, 0);
// Pointer to 16 bytes of random data
auxv.emplace_back(M5_AT_RANDOM, 0);
//The filename of the program
auxv.emplace_back(M5_AT_EXECFN, 0);
//The string "v71" -- ARM v7 architecture
auxv.emplace_back(M5_AT_PLATFORM, 0);
}
//The system page size
auxv.emplace_back(M5_AT_PAGESZ, ArmISA::PageBytes);
// For statically linked executables, this is the virtual address of
// the program header tables if they appear in the executable image
auxv.emplace_back(M5_AT_PHDR, elfObject->programHeaderTable());
// This is the size of a program header entry from the elf file.
auxv.emplace_back(M5_AT_PHENT, elfObject->programHeaderSize());
// This is the number of program headers from the original elf file.
auxv.emplace_back(M5_AT_PHNUM, elfObject->programHeaderCount());
// This is the base address of the ELF interpreter; it should be
// zero for static executables or contain the base address for
// dynamic executables.
auxv.emplace_back(M5_AT_BASE, getBias());
//XXX Figure out what this should be.
auxv.emplace_back(M5_AT_FLAGS, 0);
//The entry point to the program
auxv.emplace_back(M5_AT_ENTRY, objFile->entryPoint());
//Different user and group IDs
auxv.emplace_back(M5_AT_UID, uid());
auxv.emplace_back(M5_AT_EUID, euid());
auxv.emplace_back(M5_AT_GID, gid());
auxv.emplace_back(M5_AT_EGID, egid());
}
//Figure out how big the initial stack nedes to be
// A sentry NULL void pointer at the top of the stack.
int sentry_size = intSize;
string platform = "v71";
int platform_size = platform.size() + 1;
// Bytes for AT_RANDOM above, we'll just keep them 0
int aux_random_size = 16; // as per the specification
// The aux vectors are put on the stack in two groups. The first group are
// the vectors that are generated as the elf is loaded. The second group
// are the ones that were computed ahead of time and include the platform
// string.
int aux_data_size = filename.size() + 1;
int env_data_size = 0;
for (int i = 0; i < envp.size(); ++i) {
env_data_size += envp[i].size() + 1;
}
int arg_data_size = 0;
for (int i = 0; i < argv.size(); ++i) {
arg_data_size += argv[i].size() + 1;
}
int info_block_size =
sentry_size + env_data_size + arg_data_size +
aux_data_size + platform_size + aux_random_size;
//Each auxilliary vector is two 4 byte words
int aux_array_size = intSize * 2 * (auxv.size() + 1);
int envp_array_size = intSize * (envp.size() + 1);
int argv_array_size = intSize * (argv.size() + 1);
int argc_size = intSize;
//Figure out the size of the contents of the actual initial frame
int frame_size =
info_block_size +
aux_array_size +
envp_array_size +
argv_array_size +
argc_size;
//There needs to be padding after the auxiliary vector data so that the
//very bottom of the stack is aligned properly.
int partial_size = frame_size;
int aligned_partial_size = roundUp(partial_size, align);
int aux_padding = aligned_partial_size - partial_size;
int space_needed = frame_size + aux_padding;
memState->setStackMin(memState->getStackBase() - space_needed);
memState->setStackMin(roundDown(memState->getStackMin(), align));
memState->setStackSize(memState->getStackBase() - memState->getStackMin());
// map memory
memState->mapRegion(roundDown(memState->getStackMin(), pageSize),
roundUp(memState->getStackSize(), pageSize), "stack");
// map out initial stack contents
IntType sentry_base = memState->getStackBase() - sentry_size;
IntType aux_data_base = sentry_base - aux_data_size;
IntType env_data_base = aux_data_base - env_data_size;
IntType arg_data_base = env_data_base - arg_data_size;
IntType platform_base = arg_data_base - platform_size;
IntType aux_random_base = platform_base - aux_random_size;
IntType auxv_array_base = aux_random_base - aux_array_size - aux_padding;
IntType envp_array_base = auxv_array_base - envp_array_size;
IntType argv_array_base = envp_array_base - argv_array_size;
IntType argc_base = argv_array_base - argc_size;
DPRINTF(Stack, "The addresses of items on the initial stack:\n");
DPRINTF(Stack, "0x%x - aux data\n", aux_data_base);
DPRINTF(Stack, "0x%x - env data\n", env_data_base);
DPRINTF(Stack, "0x%x - arg data\n", arg_data_base);
DPRINTF(Stack, "0x%x - random data\n", aux_random_base);
DPRINTF(Stack, "0x%x - platform base\n", platform_base);
DPRINTF(Stack, "0x%x - auxv array\n", auxv_array_base);
DPRINTF(Stack, "0x%x - envp array\n", envp_array_base);
DPRINTF(Stack, "0x%x - argv array\n", argv_array_base);
DPRINTF(Stack, "0x%x - argc \n", argc_base);
DPRINTF(Stack, "0x%x - stack min\n", memState->getStackMin());
// write contents to stack
// figure out argc
IntType argc = argv.size();
IntType guestArgc = htole(argc);
//Write out the sentry void *
IntType sentry_NULL = 0;
initVirtMem->writeBlob(sentry_base, &sentry_NULL, sentry_size);
//Fix up the aux vectors which point to other data
for (int i = auxv.size() - 1; i >= 0; i--) {
if (auxv[i].type == M5_AT_PLATFORM) {
auxv[i].val = platform_base;
initVirtMem->writeString(platform_base, platform.c_str());
} else if (auxv[i].type == M5_AT_EXECFN) {
auxv[i].val = aux_data_base;
initVirtMem->writeString(aux_data_base, filename.c_str());
} else if (auxv[i].type == M5_AT_RANDOM) {
auxv[i].val = aux_random_base;
// Just leave the value 0, we don't want randomness
}
}
//Copy the aux stuff
Addr auxv_array_end = auxv_array_base;
for (const auto &aux: auxv) {
initVirtMem->write(auxv_array_end, aux, GuestByteOrder);
auxv_array_end += sizeof(aux);
}
//Write out the terminating zeroed auxillary vector
const AuxVector<IntType> zero(0, 0);
initVirtMem->write(auxv_array_end, zero);
auxv_array_end += sizeof(zero);
copyStringArray(envp, envp_array_base, env_data_base,
ByteOrder::little, *initVirtMem);
copyStringArray(argv, argv_array_base, arg_data_base,
ByteOrder::little, *initVirtMem);
initVirtMem->writeBlob(argc_base, &guestArgc, intSize);
ThreadContext *tc = system->threads[contextIds[0]];
//Set the stack pointer register
tc->setIntReg(spIndex, memState->getStackMin());
//A pointer to a function to run when the program exits. We'll set this
//to zero explicitly to make sure this isn't used.
tc->setIntReg(ArgumentReg0, 0);
//Set argument regs 1 and 2 to argv[0] and envp[0] respectively
if (argv.size() > 0) {
tc->setIntReg(ArgumentReg1, arg_data_base + arg_data_size -
argv[argv.size() - 1].size() - 1);
} else {
tc->setIntReg(ArgumentReg1, 0);
}
if (envp.size() > 0) {
tc->setIntReg(ArgumentReg2, env_data_base + env_data_size -
envp[envp.size() - 1].size() - 1);
} else {
tc->setIntReg(ArgumentReg2, 0);
}
PCState pc;
pc.thumb(arch == ::Loader::Thumb);
pc.nextThumb(pc.thumb());
pc.aarch64(arch == ::Loader::Arm64);
pc.nextAArch64(pc.aarch64());
pc.set(getStartPC() & ~mask(1));
tc->pcState(pc);
//Align the "stackMin" to a page boundary.
memState->setStackMin(roundDown(memState->getStackMin(), pageSize));
}
const std::vector<int> ArmProcess32::SyscallABI::ArgumentRegs = {
0, 1, 2, 3, 4, 5, 6
};
const std::vector<int> ArmProcess64::SyscallABI::ArgumentRegs = {
0, 1, 2, 3, 4, 5, 6
};
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