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2da4a2cdca3a2cd7cea8aaa6038be6527ec90dff
gem5/src/arch/arm/semihosting.cc
Gabe Black 5efe4d4a3a arch-arm: Rework the int regs. 
Change-Id: I352e12d4742f0771859bdbf9634ac87e2c153427
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/49764
Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
2022-06-08 20:33:42 +00:00

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/*
* Copyright (c) 2018, 2019 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.
*
* 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/semihosting.hh"
#include <unistd.h>
#include <cerrno>
#include <cstdio>
#include "arch/arm/utility.hh"
#include "base/logging.hh"
#include "base/output.hh"
#include "base/time.hh"
#include "debug/Semihosting.hh"
#include "dev/serial/serial.hh"
#include "mem/physical.hh"
#include "mem/se_translating_port_proxy.hh"
#include "mem/translating_port_proxy.hh"
#include "params/ArmSemihosting.hh"
#include "sim/byteswap.hh"
#include "sim/full_system.hh"
#include "sim/pseudo_inst.hh"
#include "sim/sim_exit.hh"
#include "sim/system.hh"
namespace gem5
{
const std::map<uint32_t, ArmSemihosting::SemiCall> ArmSemihosting::calls{
{ SYS_OPEN, { "SYS_OPEN", &ArmSemihosting::callOpen } },
{ SYS_CLOSE, { "SYS_CLOSE", &ArmSemihosting::callClose } },
{ SYS_WRITEC, { "SYS_WRITEC", &ArmSemihosting::callWriteC } },
{ SYS_WRITE0, { "SYS_WRITE0", &ArmSemihosting::callWrite0 } },
{ SYS_WRITE, { "SYS_WRITE", &ArmSemihosting::callWrite } },
{ SYS_READ, { "SYS_READ", &ArmSemihosting::callRead } },
{ SYS_READC, { "SYS_READC", &ArmSemihosting::callReadC } },
{ SYS_ISERROR, { "SYS_ISERROR", &ArmSemihosting::callIsError } },
{ SYS_ISTTY, { "SYS_ISTTY", &ArmSemihosting::callIsTTY } },
{ SYS_SEEK, { "SYS_SEEK", &ArmSemihosting::callSeek } },
{ SYS_FLEN, { "SYS_FLEN", &ArmSemihosting::callFLen } },
{ SYS_TMPNAM, { "SYS_TMPNAM", &ArmSemihosting::callTmpNam } },
{ SYS_REMOVE, { "SYS_REMOVE", &ArmSemihosting::callRemove } },
{ SYS_RENAME, { "SYS_RENAME", &ArmSemihosting::callRename } },
{ SYS_CLOCK, { "SYS_CLOCK", &ArmSemihosting::callClock } },
{ SYS_TIME, { "SYS_TIME", &ArmSemihosting::callTime } },
{ SYS_SYSTEM, { "SYS_SYSTEM", &ArmSemihosting::callSystem } },
{ SYS_ERRNO, { "SYS_ERRNO", &ArmSemihosting::callErrno } },
{ SYS_GET_CMDLINE,
{ "SYS_GET_CMDLINE", &ArmSemihosting::callGetCmdLine } },
{ SYS_HEAPINFO, { "SYS_HEAPINFO", &ArmSemihosting::callHeapInfo32,
&ArmSemihosting::callHeapInfo64 } },
{ SYS_EXIT, { "SYS_EXIT", &ArmSemihosting::callExit32,
&ArmSemihosting::callExit64} },
{ SYS_EXIT_EXTENDED,
{ "SYS_EXIT_EXTENDED", &ArmSemihosting::callExitExtended } },
{ SYS_ELAPSED, { "SYS_ELAPSED", &ArmSemihosting::callElapsed32,
&ArmSemihosting::callElapsed64 } },
{ SYS_TICKFREQ, { "SYS_TICKFREQ", &ArmSemihosting::callTickFreq } },
{ SYS_GEM5_PSEUDO_OP,
{ "SYS_GEM5_PSEUDO_OP", &ArmSemihosting::callGem5PseudoOp32,
&ArmSemihosting::callGem5PseudoOp64 } },
};
const std::vector<const char *> ArmSemihosting::fmodes{
"r", "rb", "r+", "r+b",
"w", "wb", "w+", "w+b",
"a", "ab", "a+", "a+b",
};
const std::map<uint64_t, const char *> ArmSemihosting::exitCodes{
{ 0x20000, "semi:ADP_Stopped_BranchThroughZero" },
{ 0x20001, "semi:ADP_Stopped_UndefinedInstr" },
{ 0x20002, "semi:ADP_Stopped_SoftwareInterrupt" },
{ 0x20003, "semi:ADP_Stopped_PrefetchAbort" },
{ 0x20004, "semi:ADP_Stopped_DataAbort" },
{ 0x20005, "semi:ADP_Stopped_AddressException" },
{ 0x20006, "semi:ADP_Stopped_IRQ" },
{ 0x20007, "semi:ADP_Stopped_FIQ" },
{ 0x20020, "semi:ADP_Stopped_BreakPoint" },
{ 0x20021, "semi:ADP_Stopped_WatchPoint" },
{ 0x20022, "semi:ADP_Stopped_StepComplete" },
{ 0x20023, "semi:ADP_Stopped_RunTimeErrorUnknown" },
{ 0x20024, "semi:ADP_Stopped_InternalError" },
{ 0x20025, "semi:ADP_Stopped_UserInterruption" },
{ 0x20026, "semi:ADP_Stopped_ApplicationExit" },
{ 0x20027, "semi:ADP_Stopped_StackOverflow" },
{ 0x20028, "semi:ADP_Stopped_DivisionByZero" },
{ 0x20029, "semi:ADP_Stopped_DivisionByZero" },
};
const std::vector<uint8_t> ArmSemihosting::features{
0x53, 0x48, 0x46, 0x42, // Magic
0x3, // EXT_EXIT_EXTENDED, EXT_STDOUT_STDERR
};
const std::map<const std::string, FILE *> ArmSemihosting::stdioMap{
{"cin", ::stdin},
{"stdin", ::stdin},
{"cout", ::stdout},
{"stdout", ::stdout},
{"cerr", ::stderr},
{"stderr", ::stderr},
};
ArmSemihosting::ArmSemihosting(const ArmSemihostingParams &p)
: SimObject(p),
cmdLine(p.cmd_line),
memReserve(p.mem_reserve),
stackSize(p.stack_size),
timeBase([p]{ struct tm t = p.time; return mkutctime(&t); }()),
tickShift(calcTickShift()),
semiErrno(0),
filesRootDir(!p.files_root_dir.empty() &&
p.files_root_dir.back() != '/' ?
p.files_root_dir + '/' : p.files_root_dir),
stdin(getSTDIO("stdin", p.stdin, "r")),
stdout(getSTDIO("stdout", p.stdout, "w")),
stderr(p.stderr == p.stdout ?
stdout : getSTDIO("stderr", p.stderr, "w"))
{
// Create an empty place-holder file for position 0 as semi-hosting
// calls typically expect non-zero file handles.
files.push_back(nullptr);
if (tickShift > 0)
inform("Semihosting: Shifting elapsed ticks by %i bits.",
tickShift);
}
bool
ArmSemihosting::call64(ThreadContext *tc, bool gem5_ops)
{
RegVal op = tc->getReg(ArmISA::int_reg::X0) & mask(32);
if (op > MaxStandardOp && !gem5_ops) {
unrecognizedCall<Abi64>(
tc, "Gem5 semihosting op (0x%x) disabled from here.", op);
return false;
}
auto it = calls.find(op);
if (it == calls.end()) {
unrecognizedCall<Abi64>(
tc, "Unknown aarch64 semihosting call: op = 0x%x", op);
return false;
}
const SemiCall &call = it->second;
DPRINTF(Semihosting, "Semihosting call64: %s\n", call.dump64(tc));
auto err = call.call64(this, tc);
semiErrno = err.second;
DPRINTF(Semihosting, "\t ->: 0x%x, %i\n", err.first, err.second);
return true;
}
bool
ArmSemihosting::call32(ThreadContext *tc, bool gem5_ops)
{
RegVal op = tc->getReg(ArmISA::int_reg::R0);
if (op > MaxStandardOp && !gem5_ops) {
unrecognizedCall<Abi32>(
tc, "Gem5 semihosting op (0x%x) disabled from here.", op);
return false;
}
auto it = calls.find(op);
if (it == calls.end()) {
unrecognizedCall<Abi32>(
tc, "Unknown aarch32 semihosting call: op = 0x%x", op);
return false;
}
const SemiCall &call = it->second;
DPRINTF(Semihosting, "Semihosting call32: %s\n", call.dump32(tc));
auto err = call.call32(this, tc);
semiErrno = err.second;
DPRINTF(Semihosting, "\t ->: 0x%x, %i\n", err.first, err.second);
return true;
}
void
ArmSemihosting::serialize(CheckpointOut &cp) const
{
SERIALIZE_SCALAR(semiErrno);
paramOut(cp, "num_files", files.size());
for (int i = 0; i < files.size(); i++) {
// File closed?
if (!files[i])
continue;
files[i]->serializeSection(cp, csprintf("file%i", i));
}
}
void
ArmSemihosting::unserialize(CheckpointIn &cp)
{
UNSERIALIZE_SCALAR(semiErrno);
size_t num_files;
paramIn(cp, "num_files", num_files);
files.resize(num_files);
for (int i = 0; i < num_files; i++)
files[i] = FileBase::create(*this, cp, csprintf("file%i", i));
}
PortProxy &
ArmSemihosting::portProxy(ThreadContext *tc)
{
static std::unique_ptr<PortProxy> port_proxy_s;
static std::unique_ptr<PortProxy> port_proxy_ns;
static System *secure_sys = nullptr;
if (ArmISA::isSecure(tc)) {
System *sys = tc->getSystemPtr();
if (sys != secure_sys) {
if (FullSystem) {
port_proxy_s.reset(
new TranslatingPortProxy(tc, Request::SECURE));
} else {
port_proxy_s.reset(
new SETranslatingPortProxy(
tc, SETranslatingPortProxy::NextPage,
Request::SECURE));
}
}
secure_sys = sys;
return *port_proxy_s;
} else {
if (!port_proxy_ns) {
if (FullSystem) {
port_proxy_ns.reset(new TranslatingPortProxy(tc));
} else {
port_proxy_ns.reset(new SETranslatingPortProxy(tc));
}
}
return *port_proxy_ns;
}
}
std::string
ArmSemihosting::readString(ThreadContext *tc, Addr ptr, size_t len)
{
std::vector<char> buf(len + 1);
buf[len] = '\0';
portProxy(tc).readBlob(ptr, buf.data(), len);
return std::string(buf.data());
}
ArmSemihosting::RetErrno
ArmSemihosting::callOpen(ThreadContext *tc, const Addr name_base,
int fmode, size_t name_size)
{
const char *mode = fmode < fmodes.size() ? fmodes[fmode] : nullptr;
DPRINTF(Semihosting, "Semihosting SYS_OPEN(0x%x, %i[%s], %i)\n",
name_base, fmode, mode ? mode : "-", name_size);
if (!mode || !name_base)
return retError(EINVAL);
std::string fname = readString(tc, name_base, name_size);
if (!fname.empty() && fname.front() != '/')
fname = filesRootDir + fname;
std::unique_ptr<ArmSemihosting::FileBase> file =
FileBase::create(*this, fname, mode);
int64_t ret = file->open();
DPRINTF(Semihosting, "Semihosting SYS_OPEN(\"%s\", %i[%s]): %i\n",
fname, fmode, mode, ret);
if (ret < 0) {
return retError(-ret);
} else {
files.push_back(std::move(file));
return retOK(files.size() - 1);
}
}
ArmSemihosting::RetErrno
ArmSemihosting::callClose(ThreadContext *tc, Handle handle)
{
if (handle > files.size()) {
DPRINTF(Semihosting, "Semihosting SYS_CLOSE(%i): Illegal file\n");
return retError(EBADF);
}
std::unique_ptr<FileBase> &file = files[handle];
int64_t error = file->close();
DPRINTF(Semihosting, "Semihosting SYS_CLOSE(%i[%s]): %i\n",
handle, file->fileName(), error);
if (error < 0) {
return retError(-error);
} else {
// Zap the pointer and free the entry in the file table as
// well.
files[handle].reset();
return retOK(0);
}
}
ArmSemihosting::RetErrno
ArmSemihosting::callWriteC(ThreadContext *tc, InPlaceArg arg)
{
const char c = portProxy(tc).read<char>(arg.addr);
DPRINTF(Semihosting, "Semihosting SYS_WRITEC('%c')\n", c);
std::cout.put(c);
return retOK(0);
}
ArmSemihosting::RetErrno
ArmSemihosting::callWrite0(ThreadContext *tc, InPlaceArg arg)
{
DPRINTF(Semihosting, "Semihosting SYS_WRITE0(...)\n");
PortProxy &proxy = portProxy(tc);
std::string str;
proxy.readString(str, arg.addr);
std::cout.write(str.c_str(), str.size());
return retOK(0);
}
ArmSemihosting::RetErrno
ArmSemihosting::callWrite(ThreadContext *tc, Handle handle, Addr addr,
size_t size)
{
if (handle > files.size() || !files[handle])
return RetErrno(size, EBADF);
std::vector<uint8_t> buffer(size);
portProxy(tc).readBlob(addr, buffer.data(), buffer.size());
int64_t ret = files[handle]->write(buffer.data(), buffer.size());
if (ret < 0) {
// No bytes written (we're returning the number of bytes not
// written)
return RetErrno(size, -ret);
} else {
// Return the number of bytes not written
return RetErrno(size - ret, 0);
}
}
ArmSemihosting::RetErrno
ArmSemihosting::callRead(ThreadContext *tc, Handle handle, Addr addr,
size_t size)
{
if (handle > files.size() || !files[handle])
return RetErrno(size, EBADF);
std::vector<uint8_t> buffer(size);
int64_t ret = files[handle]->read(buffer.data(), buffer.size());
if (ret < 0) {
return RetErrno(size, -ret);
} else {
panic_if(ret > buffer.size(), "Read longer than buffer size.");
portProxy(tc).writeBlob(addr, buffer.data(), ret);
// Return the number of bytes not written
return retOK(size - ret);
}
}
ArmSemihosting::RetErrno
ArmSemihosting::callReadC(ThreadContext *tc)
{
return retOK((char)std::cin.get());
}
ArmSemihosting::RetErrno
ArmSemihosting::callIsError(ThreadContext *tc, int64_t status)
{
return retOK(status < 0 ? 1 : 0);
}
ArmSemihosting::RetErrno
ArmSemihosting::callIsTTY(ThreadContext *tc, Handle handle)
{
if (handle > files.size() || !files[handle])
return retError(EBADF);
int64_t ret = files[handle]->isTTY();
if (ret < 0) {
return retError(-ret);
} else {
return retOK(ret ? 1 : 0);
}
}
ArmSemihosting::RetErrno
ArmSemihosting::callSeek(ThreadContext *tc, Handle handle, uint64_t pos)
{
if (handle > files.size() || !files[handle])
return retError(EBADF);
int64_t ret = files[handle]->seek(pos);
if (ret < 0) {
return retError(-ret);
} else {
return retOK(0);
}
}
ArmSemihosting::RetErrno
ArmSemihosting::callFLen(ThreadContext *tc, Handle handle)
{
if (handle > files.size() || !files[handle])
return retError(EBADF);
int64_t ret = files[handle]->flen();
if (ret < 0) {
return retError(-ret);
} else {
return retOK(ret);
}
}
ArmSemihosting::RetErrno
ArmSemihosting::callTmpNam(ThreadContext *tc, Addr addr, uint64_t id,
size_t size)
{
std::string path = "";
int64_t unlink_call_ret = 0;
do {
path = simout.resolve(csprintf("%s.tmp%05i", name(), tmpNameIndex++));
// remove the (potentially existing) file of the given path
unlink_call_ret = unlink(path.c_str());
// if the file is busy, find another name
} while ((unlink_call_ret < 0) && (errno == EBUSY));
const size_t path_len = path.length();
if (path_len >= size)
return retError(ENOSPC);
portProxy(tc).writeBlob(addr, path.c_str(), path_len + 1);
return retOK(0);
}
ArmSemihosting::RetErrno
ArmSemihosting::callRemove(ThreadContext *tc, Addr name_base, size_t name_size)
{
std::string fname = readString(tc, name_base, name_size);
if (remove(fname.c_str()) != 0) {
return retError(errno);
} else {
return retOK(0);
}
}
ArmSemihosting::RetErrno
ArmSemihosting::callRename(ThreadContext *tc, Addr from_addr, size_t from_size,
Addr to_addr, size_t to_size)
{
std::string from = readString(tc, from_addr, from_size);
std::string to = readString(tc, to_addr, to_size);
if (rename(from.c_str(), to.c_str()) != 0) {
return retError(errno);
} else {
return retOK(0);
}
}
ArmSemihosting::RetErrno
ArmSemihosting::callClock(ThreadContext *tc)
{
return retOK(curTick() / (sim_clock::as_int::s / 100));
}
ArmSemihosting::RetErrno
ArmSemihosting::callTime(ThreadContext *tc)
{
return retOK(timeBase + round(curTick() / sim_clock::as_float::s));
}
ArmSemihosting::RetErrno
ArmSemihosting::callSystem(ThreadContext *tc, Addr cmd_addr, size_t cmd_size)
{
const std::string cmd = readString(tc, cmd_addr, cmd_size);
warn("Semihosting: SYS_SYSTEM not implemented. Guest tried to run: %s\n",
cmd);
return retError(EINVAL);
}
ArmSemihosting::RetErrno
ArmSemihosting::callErrno(ThreadContext *tc)
{
// Preserve errno by returning it in errno as well.
return RetErrno(semiErrno, semiErrno);
}
ArmSemihosting::RetErrno
ArmSemihosting::callGetCmdLine(ThreadContext *tc, Addr addr,
InPlaceArg size_arg)
{
PortProxy &proxy = portProxy(tc);
ByteOrder endian = ArmISA::byteOrder(tc);
size_t size = size_arg.read(tc, endian);
if (cmdLine.size() + 1 < size) {
proxy.writeBlob(addr, cmdLine.c_str(), cmdLine.size() + 1);
size_arg.write(tc, cmdLine.size(), endian);
return retOK(0);
} else {
return retError(0);
}
}
void
ArmSemihosting::gatherHeapInfo(ThreadContext *tc, bool aarch64,
Addr &heap_base, Addr &heap_limit,
Addr &stack_base, Addr &stack_limit)
{
const memory::PhysicalMemory &phys = tc->getSystemPtr()->getPhysMem();
const AddrRangeList memories = phys.getConfAddrRanges();
fatal_if(memories.size() < 1, "No memories reported from System");
warn_if(memories.size() > 1, "Multiple physical memory ranges available. "
"Using first range heap/stack.");
const AddrRange mem = *memories.begin();
const Addr mem_start = mem.start() + memReserve;
Addr mem_end = mem.end();
// Make sure that 32-bit guests can access their memory.
if (!aarch64) {
const Addr phys_max = (1ULL << 32) - 1;
panic_if(mem_start > phys_max,
"Physical memory out of range for a 32-bit guest.");
if (mem_end > phys_max) {
warn("Some physical memory out of range for a 32-bit guest.");
mem_end = phys_max;
}
}
fatal_if(mem_start + stackSize >= mem_end,
"Physical memory too small to fit desired stack and a heap.");
heap_base = mem_start;
heap_limit = mem_end - stackSize + 1;
stack_base = (mem_end + 1) & ~0x7ULL; // 8 byte stack alignment
stack_limit = heap_limit;
inform("Reporting heap/stack info to guest:\n"
"\tHeap base: 0x%x\n"
"\tHeap limit: 0x%x\n"
"\tStack base: 0x%x\n"
"\tStack limit: 0x%x\n",
heap_base, heap_limit, stack_base, stack_limit);
}
ArmSemihosting::RetErrno
ArmSemihosting::callHeapInfo32(ThreadContext *tc, Addr block_addr)
{
uint64_t heap_base, heap_limit, stack_base, stack_limit;
gatherHeapInfo(tc, false, heap_base, heap_limit, stack_base, stack_limit);
std::array<uint32_t, 4> block = {{
(uint32_t)heap_base, (uint32_t)heap_limit,
(uint32_t)stack_base, (uint32_t)stack_limit
}};
portProxy(tc).write(block_addr, block, ArmISA::byteOrder(tc));
return retOK(0);
}
ArmSemihosting::RetErrno
ArmSemihosting::callHeapInfo64(ThreadContext *tc, Addr block_addr)
{
uint64_t heap_base, heap_limit, stack_base, stack_limit;
gatherHeapInfo(tc, true, heap_base, heap_limit, stack_base, stack_limit);
std::array<uint64_t, 4> block = {{
heap_base, heap_limit, stack_base, stack_limit
}};
portProxy(tc).write(block_addr, block, ArmISA::byteOrder(tc));
return retOK(0);
}
ArmSemihosting::RetErrno
ArmSemihosting::callExit32(ThreadContext *tc, InPlaceArg code)
{
semiExit(code.addr, 0);
return retOK(0);
}
ArmSemihosting::RetErrno
ArmSemihosting::callExit64(ThreadContext *tc, uint64_t code, uint64_t subcode)
{
semiExit(code, subcode);
return retOK(0);
}
ArmSemihosting::RetErrno
ArmSemihosting::callExitExtended(ThreadContext *tc,
uint64_t code, uint64_t subcode)
{
semiExit(code, subcode);
return retOK(0);
}
void
ArmSemihosting::semiExit(uint64_t code, uint64_t subcode)
{
auto it = exitCodes.find(code);
if (it != exitCodes.end()) {
exitSimLoop(it->second, subcode);
} else {
exitSimLoop(csprintf("semi:0x%x", code), subcode);
}
}
ArmSemihosting::RetErrno
ArmSemihosting::callElapsed32(ThreadContext *tc, InPlaceArg low,
InPlaceArg high)
{
ByteOrder endian = ArmISA::byteOrder(tc);
uint64_t tick = semiTick(curTick());
low.write(tc, tick, endian);
high.write(tc, tick >> 32, endian);
return retOK(0);
}
ArmSemihosting::RetErrno
ArmSemihosting::callElapsed64(ThreadContext *tc, InPlaceArg ticks)
{
ticks.write(tc, semiTick(curTick()), ArmISA::byteOrder(tc));
return retOK(0);
}
ArmSemihosting::RetErrno
ArmSemihosting::callTickFreq(ThreadContext *tc)
{
return retOK(semiTick(sim_clock::Frequency));
}
struct SemiPseudoAbi32 : public ArmSemihosting::Abi32
{
class State : public ArmSemihosting::Abi32::State
{
public:
State(const ThreadContext *tc) : ArmSemihosting::Abi32::State(tc)
{
// Use getAddr() to skip the func number in the first slot.
getAddr();
}
};
};
struct SemiPseudoAbi64 : public ArmSemihosting::Abi64
{
class State : public ArmSemihosting::Abi64::State
{
public:
State(const ThreadContext *tc) : ArmSemihosting::Abi64::State(tc)
{
// Use getAddr() to skip the func number in the first slot.
getAddr();
}
};
};
GEM5_DEPRECATED_NAMESPACE(GuestABI, guest_abi);
namespace guest_abi
{
// Handle arguments the same as for semihosting operations. Skipping the first
// slot is handled internally by the State type.
template <typename T>
struct Argument<SemiPseudoAbi32, T> :
public Argument<ArmSemihosting::Abi32, T>
{};
template <typename T>
struct Argument<SemiPseudoAbi64, T> :
public Argument<ArmSemihosting::Abi64, T>
{};
} // namespace guest_abi
ArmSemihosting::RetErrno
ArmSemihosting::callGem5PseudoOp32(ThreadContext *tc, uint32_t encoded_func)
{
uint8_t func;
pseudo_inst::decodeAddrOffset(encoded_func, func);
uint64_t ret;
if (pseudo_inst::pseudoInst<SemiPseudoAbi32>(tc, func, ret))
return retOK(ret);
else
return retError(EINVAL);
}
ArmSemihosting::RetErrno
ArmSemihosting::callGem5PseudoOp64(ThreadContext *tc, uint64_t encoded_func)
{
uint8_t func;
pseudo_inst::decodeAddrOffset(encoded_func, func);
uint64_t ret;
if (pseudo_inst::pseudoInst<SemiPseudoAbi64>(tc, func, ret))
return retOK(ret);
else
return retError(EINVAL);
}
FILE *
ArmSemihosting::getSTDIO(const char *stream_name,
const std::string &name, const char *mode)
{
auto it = stdioMap.find(name);
if (it == stdioMap.end()) {
FILE *f = fopen(name.c_str(), mode);
if (!f) {
fatal("Failed to open %s (%s): %s\n",
stream_name, name, strerror(errno));
}
return f;
} else {
return it->second;
}
}
std::unique_ptr<ArmSemihosting::FileBase>
ArmSemihosting::FileBase::create(
ArmSemihosting &parent, const std::string &fname, const char *mode)
{
std::unique_ptr<FileBase> file;
if (fname == ":semihosting-features") {
file.reset(new FileFeatures(parent, fname.c_str(), mode));
} else {
file.reset(new File(parent, fname.c_str(), mode));
}
return file;
}
std::unique_ptr<ArmSemihosting::FileBase>
ArmSemihosting::FileBase::create(ArmSemihosting &parent,
CheckpointIn &cp, const std::string &sec)
{
std::unique_ptr<FileBase> file;
ScopedCheckpointSection _sec(cp, sec);
// Was the file open when the checkpoint was created?
if (!cp.sectionExists(Serializable::currentSection()))
return file;
std::string fname, mode;
paramIn(cp, "name", fname);
paramIn(cp, "mode", mode);
file = create(parent, fname, mode.c_str());
assert(file);
file->unserialize(cp);
return file;
}
void
ArmSemihosting::FileBase::serialize(CheckpointOut &cp) const
{
paramOut(cp, "name", _name);
SERIALIZE_SCALAR(mode);
}
void
ArmSemihosting::FileBase::unserialize(CheckpointIn &cp)
{
/* Unserialization of name and mode happens in
* ArmSemihosting::FileBase::create() */
}
int64_t
ArmSemihosting::FileBase::read(uint8_t *buffer, uint64_t size)
{
return -EINVAL;
}
int64_t
ArmSemihosting::FileBase::write(const uint8_t *buffer, uint64_t size)
{
return -EINVAL;
}
int64_t
ArmSemihosting::FileBase::seek(uint64_t pos)
{
return -EINVAL;
}
int64_t
ArmSemihosting::FileBase::flen()
{
return -EINVAL;
}
ArmSemihosting::FileFeatures::FileFeatures(
ArmSemihosting &_parent, const char *_name, const char *_mode)
: FileBase(_parent, _name, _mode)
{
}
int64_t
ArmSemihosting::FileFeatures::read(uint8_t *buffer, uint64_t size)
{
int64_t len = 0;
for (; pos < size && pos < ArmSemihosting::features.size(); pos++)
buffer[len++] = ArmSemihosting::features[pos];
return len;
}
int64_t
ArmSemihosting::FileFeatures::seek(uint64_t _pos)
{
if (_pos < ArmSemihosting::features.size()) {
pos = _pos;
return 0;
} else {
return -ENXIO;
}
}
void
ArmSemihosting::FileFeatures::serialize(CheckpointOut &cp) const
{
FileBase::serialize(cp);
SERIALIZE_SCALAR(pos);
}
void
ArmSemihosting::FileFeatures::unserialize(CheckpointIn &cp)
{
FileBase::unserialize(cp);
UNSERIALIZE_SCALAR(pos);
}
ArmSemihosting::File::File(ArmSemihosting &_parent,
const char *_name, const char *_perms)
: FileBase(_parent, _name, _perms),
file(nullptr)
{
}
ArmSemihosting::File::~File()
{
if (file)
close();
}
int64_t
ArmSemihosting::File::openImpl(bool in_cpt)
{
panic_if(file, "Trying to open an already open file.\n");
if (_name == ":tt") {
if (mode[0] == 'r') {
file = parent.stdin;
} else if (mode[0] == 'w') {
file = parent.stdout;
} else if (mode[0] == 'a') {
file = parent.stderr;
} else {
warn("Unknown file mode for the ':tt' special file");
return -EINVAL;
}
} else {
std::string real_mode(this->mode);
// Avoid truncating the file if we are restoring from a
// checkpoint.
if (in_cpt && real_mode[0] == 'w')
real_mode[0] = 'a';
file = fopen(_name.c_str(), real_mode.c_str());
}
return file ? 0 : -errno;
}
int64_t
ArmSemihosting::File::close()
{
panic_if(!file, "Trying to close an already closed file.\n");
if (needClose()) {
fclose(file);
}
file = nullptr;
return 0;
}
bool
ArmSemihosting::File::isTTY() const
{
return file == parent.stdout ||
file == parent.stderr ||
file == parent.stdin;
}
int64_t
ArmSemihosting::File::read(uint8_t *buffer, uint64_t size)
{
panic_if(!file, "Trying to read from a closed file");
size_t ret = fread(buffer, 1, size, file);
if (ret == 0) {
// Error or EOF. Assume errors are due to invalid file
// operations (e.g., reading a write-only stream).
return ferror(file) ? -EINVAL : 0;
} else {
return ret;
}
}
int64_t
ArmSemihosting::File::write(const uint8_t *buffer, uint64_t size)
{
panic_if(!file, "Trying to write to a closed file");
size_t ret = fwrite(buffer, 1, size, file);
if (ret == 0) {
// Assume errors are due to invalid file operations (e.g.,
// writing a read-only stream).
return -EINVAL;
} else {
return ret;
}
}
int64_t
ArmSemihosting::File::seek(uint64_t _pos)
{
panic_if(!file, "Trying to seek in a closed file");
errno = 0;
if (fseek(file, _pos, SEEK_SET) == 0)
return 0;
else
return -errno;
}
int64_t
ArmSemihosting::File::flen()
{
errno = 0;
long pos = ftell(file);
if (pos < 0)
return -errno;
if (fseek(file, 0, SEEK_END) != 0)
return -errno;
long len = ftell(file);
if (len < 0)
return -errno;
if (fseek(file, pos, SEEK_SET) != 0)
return -errno;
return len;
}
void
ArmSemihosting::File::serialize(CheckpointOut &cp) const
{
FileBase::serialize(cp);
if (!isTTY()) {
long pos = file ? ftell(file) : 0;
panic_if(pos < 0, "Failed to get file position.");
SERIALIZE_SCALAR(pos);
}
}
void
ArmSemihosting::File::unserialize(CheckpointIn &cp)
{
FileBase::unserialize(cp);
if (openImpl(true) < 0) {
fatal("Failed to open file: %s", _name);
}
if (!isTTY()) {
long pos = 0;
UNSERIALIZE_SCALAR(pos);
if (fseek(file, pos, SEEK_SET) != 0) {
fatal("Failed seek to current position (%i) in '%s'", pos, _name);
}
}
}
std::ostream &
operator << (std::ostream &os, const ArmSemihosting::InPlaceArg &ipa)
{
ccprintf(os, "[%#x-%#x)", ipa.addr, ipa.addr + ipa.size - 1);
return os;
}
} // namespace gem5
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