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/*
* Copyright (c) 2010-2013, 2016 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) 2002-2006 The Regents of The University of Michigan
* 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.
*
* Authors: Ali Saidi
*/
#include "arch/arm/linux/system.hh"
#include "arch/arm/isa_traits.hh"
#include "arch/arm/linux/atag.hh"
#include "arch/arm/utility.hh"
#include "arch/generic/linux/threadinfo.hh"
#include "base/loader/dtb_object.hh"
#include "base/loader/object_file.hh"
#include "base/loader/symtab.hh"
#include "cpu/base.hh"
#include "cpu/pc_event.hh"
#include "cpu/thread_context.hh"
#include "debug/Loader.hh"
#include "kern/linux/events.hh"
#include "kern/linux/helpers.hh"
#include "mem/fs_translating_port_proxy.hh"
#include "mem/physical.hh"
#include "sim/stat_control.hh"
using namespace ArmISA;
using namespace Linux;
LinuxArmSystem::LinuxArmSystem(Params *p)
: GenericArmSystem(p), dumpStatsPCEvent(nullptr),
enableContextSwitchStatsDump(p->enable_context_switch_stats_dump),
taskFile(nullptr), kernelPanicEvent(nullptr), kernelOopsEvent(nullptr)
{
const std::string dmesg_output = name() + ".dmesg";
if (p->panic_on_panic) {
kernelPanicEvent = addKernelFuncEventOrPanic<Linux::KernelPanicEvent>(
"panic", "Kernel panic in simulated kernel", dmesg_output);
} else {
kernelPanicEvent = addKernelFuncEventOrPanic<Linux::DmesgDumpEvent>(
"panic", "Kernel panic in simulated kernel", dmesg_output);
}
if (p->panic_on_oops) {
kernelOopsEvent = addKernelFuncEventOrPanic<Linux::KernelPanicEvent>(
"oops_exit", "Kernel oops in guest", dmesg_output);
} else {
kernelOopsEvent = addKernelFuncEventOrPanic<Linux::DmesgDumpEvent>(
"oops_exit", "Kernel oops in guest", dmesg_output);
}
// With ARM udelay() is #defined to __udelay
// newer kernels use __loop_udelay and __loop_const_udelay symbols
uDelaySkipEvent = addKernelFuncEvent<UDelayEvent>(
"__loop_udelay", "__udelay", 1000, 0);
if (!uDelaySkipEvent)
uDelaySkipEvent = addKernelFuncEventOrPanic<UDelayEvent>(
"__udelay", "__udelay", 1000, 0);
// constant arguments to udelay() have some precomputation done ahead of
// time. Constant comes from code.
constUDelaySkipEvent = addKernelFuncEvent<UDelayEvent>(
"__loop_const_udelay", "__const_udelay", 1000, 107374);
if (!constUDelaySkipEvent)
constUDelaySkipEvent = addKernelFuncEventOrPanic<UDelayEvent>(
"__const_udelay", "__const_udelay", 1000, 107374);
}
void
LinuxArmSystem::initState()
{
// Moved from the constructor to here since it relies on the
// address map being resolved in the interconnect
// Call the initialisation of the super class
GenericArmSystem::initState();
// Load symbols at physical address, we might not want
// to do this permanently, for but early bootup work
// it is helpful.
if (params()->early_kernel_symbols) {
kernel->loadGlobalSymbols(kernelSymtab, 0, 0, loadAddrMask);
kernel->loadGlobalSymbols(debugSymbolTable, 0, 0, loadAddrMask);
}
// Setup boot data structure
Addr addr = 0;
// Check if the kernel image has a symbol that tells us it supports
// device trees.
bool kernel_has_fdt_support =
kernelSymtab->findAddress("unflatten_device_tree", addr);
bool dtb_file_specified = params()->dtb_filename != "";
if (kernel_has_fdt_support && dtb_file_specified) {
// Kernel supports flattened device tree and dtb file specified.
// Using Device Tree Blob to describe system configuration.
inform("Loading DTB file: %s at address %#x\n", params()->dtb_filename,
params()->atags_addr + loadAddrOffset);
ObjectFile *dtb_file = createObjectFile(params()->dtb_filename, true);
if (!dtb_file) {
fatal("couldn't load DTB file: %s\n", params()->dtb_filename);
}
DtbObject *_dtb_file = dynamic_cast<DtbObject*>(dtb_file);
if (_dtb_file) {
if (!_dtb_file->addBootCmdLine(params()->boot_osflags.c_str(),
params()->boot_osflags.size())) {
warn("couldn't append bootargs to DTB file: %s\n",
params()->dtb_filename);
}
} else {
warn("dtb_file cast failed; couldn't append bootargs "
"to DTB file: %s\n", params()->dtb_filename);
}
dtb_file->setTextBase(params()->atags_addr + loadAddrOffset);
dtb_file->loadSegments(physProxy);
delete dtb_file;
} else {
// Using ATAGS
// Warn if the kernel supports FDT and we haven't specified one
if (kernel_has_fdt_support) {
assert(!dtb_file_specified);
warn("Kernel supports device tree, but no DTB file specified\n");
}
// Warn if the kernel doesn't support FDT and we have specified one
if (dtb_file_specified) {
assert(!kernel_has_fdt_support);
warn("DTB file specified, but no device tree support in kernel\n");
}
AtagCore ac;
ac.flags(1); // read-only
ac.pagesize(8192);
ac.rootdev(0);
AddrRangeList atagRanges = physmem.getConfAddrRanges();
if (atagRanges.size() != 1) {
fatal("Expected a single ATAG memory entry but got %d\n",
atagRanges.size());
}
AtagMem am;
am.memSize(atagRanges.begin()->size());
am.memStart(atagRanges.begin()->start());
AtagCmdline ad;
ad.cmdline(params()->boot_osflags);
DPRINTF(Loader, "boot command line %d bytes: %s\n",
ad.size() <<2, params()->boot_osflags.c_str());
AtagNone an;
uint32_t size = ac.size() + am.size() + ad.size() + an.size();
uint32_t offset = 0;
uint8_t *boot_data = new uint8_t[size << 2];
offset += ac.copyOut(boot_data + offset);
offset += am.copyOut(boot_data + offset);
offset += ad.copyOut(boot_data + offset);
offset += an.copyOut(boot_data + offset);
DPRINTF(Loader, "Boot atags was %d bytes in total\n", size << 2);
DDUMP(Loader, boot_data, size << 2);
physProxy.writeBlob(params()->atags_addr + loadAddrOffset, boot_data,
size << 2);
delete[] boot_data;
}
// Kernel boot requirements to set up r0, r1 and r2 in ARMv7
for (int i = 0; i < threadContexts.size(); i++) {
threadContexts[i]->setIntReg(0, 0);
threadContexts[i]->setIntReg(1, params()->machine_type);
threadContexts[i]->setIntReg(2, params()->atags_addr + loadAddrOffset);
}
}
LinuxArmSystem::~LinuxArmSystem()
{
if (uDelaySkipEvent)
delete uDelaySkipEvent;
if (constUDelaySkipEvent)
delete constUDelaySkipEvent;
if (dumpStatsPCEvent)
delete dumpStatsPCEvent;
}
LinuxArmSystem *
LinuxArmSystemParams::create()
{
return new LinuxArmSystem(this);
}
void
LinuxArmSystem::startup()
{
if (enableContextSwitchStatsDump) {
if (!highestELIs64()) {
dumpStatsPCEvent =
addKernelFuncEvent<DumpStatsPCEvent>("__switch_to");
} else {
dumpStatsPCEvent =
addKernelFuncEvent<DumpStatsPCEvent64>("__switch_to");
}
if (!dumpStatsPCEvent)
panic("dumpStatsPCEvent not created!");
std::string task_filename = "tasks.txt";
taskFile = simout.create(name() + "." + task_filename);
for (const auto tc : threadContexts) {
uint32_t pid = tc->getCpuPtr()->getPid();
if (pid != BaseCPU::invldPid) {
mapPid(tc, pid);
tc->getCpuPtr()->taskId(taskMap[pid]);
}
}
}
}
void
LinuxArmSystem::mapPid(ThreadContext *tc, uint32_t pid)
{
// Create a new unique identifier for this pid
std::map<uint32_t, uint32_t>::iterator itr = taskMap.find(pid);
if (itr == taskMap.end()) {
uint32_t map_size = taskMap.size();
if (map_size > ContextSwitchTaskId::MaxNormalTaskId + 1) {
warn_once("Error out of identifiers for cache occupancy stats");
taskMap[pid] = ContextSwitchTaskId::Unknown;
} else {
taskMap[pid] = map_size;
}
}
}
void
LinuxArmSystem::dumpDmesg()
{
Linux::dumpDmesg(getThreadContext(0), std::cout);
}
/**
* Extracts the information used by the DumpStatsPCEvent by reading the
* thread_info pointer passed to __switch_to() in 32 bit ARM Linux
*
* r0 = task_struct of the previously running process
* r1 = thread_info of the previously running process
* r2 = thread_info of the next process to run
*/
void
DumpStatsPCEvent::getTaskDetails(ThreadContext *tc, uint32_t &pid,
uint32_t &tgid, std::string &next_task_str, int32_t &mm) {
Linux::ThreadInfo ti(tc);
Addr task_descriptor = tc->readIntReg(2);
pid = ti.curTaskPID(task_descriptor);
tgid = ti.curTaskTGID(task_descriptor);
next_task_str = ti.curTaskName(task_descriptor);
// Streamline treats pid == -1 as the kernel process.
// Also pid == 0 implies idle process (except during Linux boot)
mm = ti.curTaskMm(task_descriptor);
}
/**
* Extracts the information used by the DumpStatsPCEvent64 by reading the
* task_struct pointer passed to __switch_to() in 64 bit ARM Linux
*
* r0 = task_struct of the previously running process
* r1 = task_struct of next process to run
*/
void
DumpStatsPCEvent64::getTaskDetails(ThreadContext *tc, uint32_t &pid,
uint32_t &tgid, std::string &next_task_str, int32_t &mm) {
Linux::ThreadInfo ti(tc);
Addr task_struct = tc->readIntReg(1);
pid = ti.curTaskPIDFromTaskStruct(task_struct);
tgid = ti.curTaskTGIDFromTaskStruct(task_struct);
next_task_str = ti.curTaskNameFromTaskStruct(task_struct);
// Streamline treats pid == -1 as the kernel process.
// Also pid == 0 implies idle process (except during Linux boot)
mm = ti.curTaskMmFromTaskStruct(task_struct);
}
/** This function is called whenever the the kernel function
* "__switch_to" is called to change running tasks.
*/
void
DumpStatsPCEvent::process(ThreadContext *tc)
{
uint32_t pid = 0;
uint32_t tgid = 0;
std::string next_task_str;
int32_t mm = 0;
getTaskDetails(tc, pid, tgid, next_task_str, mm);
bool is_kernel = (mm == 0);
if (is_kernel && (pid != 0)) {
pid = -1;
tgid = -1;
next_task_str = "kernel";
}
LinuxArmSystem* sys = dynamic_cast<LinuxArmSystem *>(tc->getSystemPtr());
if (!sys) {
panic("System is not LinuxArmSystem while getting Linux process info!");
}
std::map<uint32_t, uint32_t>& taskMap = sys->taskMap;
// Create a new unique identifier for this pid
sys->mapPid(tc, pid);
// Set cpu task id, output process info, and dump stats
tc->getCpuPtr()->taskId(taskMap[pid]);
tc->getCpuPtr()->setPid(pid);
OutputStream* taskFile = sys->taskFile;
// Task file is read by cache occupancy plotting script or
// Streamline conversion script.
ccprintf(*(taskFile->stream()),
"tick=%lld %d cpu_id=%d next_pid=%d next_tgid=%d next_task=%s\n",
curTick(), taskMap[pid], tc->cpuId(), (int) pid, (int) tgid,
next_task_str);
taskFile->stream()->flush();
// Dump and reset statistics
Stats::schedStatEvent(true, true, curTick(), 0);
}
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