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process.cpp
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process.cpp
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// PhoeniX OS Process subsystem
// Copyright © 2017 Yury Popov a.k.a. PhoeniX
#include "process.hpp"
#include "processmanager.hpp"
#include "syscall.hpp"
using PTE = Pagetable::Entry;
Process::Process() {
id = size_t(-1);
pagetable = nullptr;
entry = 0;
_aslrCode = RAND::get<uintptr_t>(0x80000000llu, 0x100000000llu) << 12;
_aslrStack = RAND::get<uintptr_t>(0x40000000llu, 0x80000000llu) << 12;
}
Process::~Process() {
void *rsp; asm volatile("mov %%rsp, %q0; and $~0xFFF, %q0":"=r"(rsp));
if (pagetable != nullptr) {
PTE addr;
for (uintptr_t ptx = 0; ptx < 512; ptx++) {
addr = pagetable[ptx];
if (!addr.present)
continue;
PTE *ppde = addr.getPTE();
for (uintptr_t pdx = 0; pdx < 512; pdx++) {
addr = ppde[pdx];
if (!addr.present)
continue;
PTE *pppde = addr.getPTE();
for (uintptr_t pdpx = 0; pdpx < 512; pdpx++) {
addr = pppde[pdpx];
if (!addr.present)
continue;
PTE *ppml4e = addr.getPTE();
for (uintptr_t pml4x = 0; pml4x < 512; pml4x++) {
addr = ppml4e[pml4x];
if (!addr.present)
continue;
void *page = addr.getPtr();
uintptr_t ptaddr = ((ptx << (12 + 9 + 9 + 9))
| (pdx << (12 + 9 + 9))
| (pdpx << (12 + 9)) | (pml4x << (12)));
if (page == rsp) continue;
if (uintptr_t(page) == ptaddr) continue;
Pagetable::free(page);
}
Pagetable::free(ppml4e);
}
Pagetable::free(pppde);
}
Pagetable::free(ppde);
}
Pagetable::free(pagetable);
}
for (size_t i = 0; i < symbols.getCount(); i++) {
delete[] symbols[i].name;
}
for (size_t i = 0; i < threads.getCount(); i++) {
ProcessManager::getManager()->dequeueThread(threads[i]);
delete threads[i];
}
}
void Process::addPage(uintptr_t vaddr, void* paddr, uint8_t flags) {
uint16_t ptx = (vaddr >> (12 + 9 + 9 + 9)) & 0x1FF;
uint16_t pdx = (vaddr >> (12 + 9 + 9)) & 0x1FF;
uint16_t pdpx = (vaddr >> (12 + 9)) & 0x1FF;
uint16_t pml4x = (vaddr >> (12)) & 0x1FF;
if (pagetable == nullptr) {
pagetable = static_cast<PTE*>(Pagetable::alloc());
addPage(uintptr_t(pagetable), pagetable, 5);
}
PTE pte = pagetable[ptx];
if (!pte.present) {
pagetable[ptx] = pte = PTE(Pagetable::alloc(), 7);
addPage(pte.getUintPtr(), pte.getPtr(), 5);
}
PTE *pde = pte.getPTE();
pte = pde[pdx];
if (!pte.present) {
pde[pdx] = pte = PTE(Pagetable::alloc(), 7);
addPage(pte.getUintPtr(), pte.getPtr(), 5);
}
PTE *pdpe = pte.getPTE();
pte = pdpe[pdpx];
if (!pte.present) {
pdpe[pdpx] = pte = PTE(Pagetable::alloc(), 7);
addPage(pte.getUintPtr(), pte.getPtr(), 5);
}
PTE *pml4e = pte.getPTE();
flags |= 1;
pml4e[pml4x] = PTE(paddr, flags);
}
uintptr_t Process::addSection(SectionType type, size_t size) {
if (size == 0)
return 0;
size_t pages = (size >> 12) + 1;
uintptr_t vaddr;
if (type != SectionTypeStack) {
vaddr = _aslrCode;
} else {
vaddr = _aslrStack;
}
for (uintptr_t caddr = vaddr; caddr < vaddr + size; caddr += 0x1000) {
if (getPhysicalAddress(vaddr) != nullptr) {
vaddr += 0x1000;
caddr = vaddr - 0x1000;
}
}
uintptr_t addr = vaddr;
while (pages-- > 0) {
uint8_t flags = 4;
switch (type) {
case SectionTypeCode:
case SectionTypeROData:
break;
case SectionTypeData:
case SectionTypeBSS:
case SectionTypeStack:
flags |= 2;
break;
}
addPage(vaddr, Pagetable::alloc(), flags);
vaddr += 0x1000;
}
return addr;
}
void Process::addSymbol(const char *name, uintptr_t ptr) {
symbols.insert() = { ptr, klib::strdup(name) };
}
void Process::setEntryAddress(uintptr_t ptr) {
entry = ptr;
}
uintptr_t Process::getSymbolByName(const char* name) {
for (size_t i = 0; i < symbols.getCount(); i++) {
if (klib::strcmp(symbols[i].name, name) == 0)
return symbols[i].ptr;
}
return 0;
}
uintptr_t Process::linkLibrary(const char* funcname) {
uintptr_t ptr = getSymbolByName(funcname);
if (ptr != 0) return ptr;
uint64_t syscall_id;
if ((syscall_id = Syscall::callByName(funcname)) != 0) {
struct {
uint8_t sbp[4];
uint8_t pushac11[4];
uint8_t movabs[2];
uint64_t syscall_id;
uint8_t syscall[2];
uint8_t popac11b[5];
uint8_t ret;
} PACKED call = {
{ 0x55, 0x48, 0x89, 0xe5 },
{ 0x50, 0x51, 0x41, 0x53 },
{ 0x48, 0xb8 },
syscall_id,
{ 0x0f, 0x05 },
{ 0x41, 0x5b, 0x59, 0x58, 0x5d },
0xc3
};
ptr = addSection(SectionTypeCode, sizeof(call));
writeData(ptr, &call, sizeof(call));
addSymbol(funcname, ptr);
}
return ptr;
}
void Process::writeData(uintptr_t address, void* src, size_t size) {
char *ptr = static_cast<char*>(src);
while (size > 0) {
void *dest = getPhysicalAddress(address);
size_t limit = 0x1000 - (uintptr_t(dest) & 0xFFF);
size_t count = klib::min(size, limit);
Memory::copy(dest, ptr, count);
size -= count;
ptr += count;
address += count;
}
}
void Process::readData(void* dst, uintptr_t address, size_t size) const {
char *ptr = static_cast<char*>(dst);
while (size > 0) {
void *src = getPhysicalAddress(address);
size_t limit = 0x1000 - (uintptr_t(src) & 0xFFF);
size_t count = klib::min(size, limit);
Memory::copy(ptr, src, count);
size -= count;
ptr += count;
address += count;
}
}
char *Process::readString(uintptr_t address) const {
size_t length = 0;
const char *src = static_cast<const char*>(getPhysicalAddress(address));
size_t limit = 0x1000 - (uintptr_t(src) & 0xFFF);
while (limit-- && src[length] != 0) {
length++;
if (limit == 0) {
src = static_cast<const char*>(getPhysicalAddress(address + length));
limit += 0x1000;
}
}
if (length == 0)
return nullptr;
char *buf = new char[length + 1]();
readData(buf, address, length + 1);
return buf;
}
void *Process::getPhysicalAddress(uintptr_t ptr) const {
if (pagetable == nullptr)
return nullptr;
uintptr_t off = ptr & 0xFFF;
PTE *addr = PTE::find(ptr, pagetable);
if (!addr || !addr->present) return nullptr;
return reinterpret_cast<void*>(addr->getUintPtr() + off);
}
void Process::addThread(Thread *thread, bool suspended) {
if (thread->stack_top == 0) {
thread->stack_top = addSection(SectionTypeStack, 0x7FFF) + 0x8000;
thread->regs.rsp = thread->stack_top;
}
thread->suspend_ticks = suspended ? uint64_t(-1) : 0;
threads.add(thread);
ProcessManager::getManager()->queueThread(this, thread);
}
void Process::allowIOPorts(uint16_t min, uint16_t max) {
for (uint16_t i = 0; i <= (max - min); i++) {
uint16_t port = min + i;
size_t space = port / 8 / 0x1000;
size_t byte = (port / 8) & 0xFFF;
size_t bit = port % 8;
uint8_t *map;
if (!(map = reinterpret_cast<uint8_t*>(iomap[space]))) {
map = reinterpret_cast<uint8_t*>(iomap[space] = Pagetable::alloc());
Memory::fill(map, 0xFF, 0x1000);
}
map[byte] &= ~(1 << bit);
}
}
void Process::startup() {
DTREG gdt = { 0, nullptr };
DTREG idt = { 0, nullptr };
asm volatile("sgdtq %0; sidtq %1":"=m"(gdt), "=m"(idt));
static const uintptr_t KB4 = 0xFFFFFFFFFFFFF000;
for (uintptr_t addr = uintptr_t(gdt.addr) & KB4;
addr < (uintptr_t(gdt.addr) + gdt.limit); addr += 0x1000) {
addPage(addr, reinterpret_cast<void*>(addr), 1);
}
for (uintptr_t addr = uintptr_t(idt.addr) & KB4;
addr < (uintptr_t(idt.addr) + idt.limit); addr += 0x1000) {
addPage(addr, reinterpret_cast<void*>(addr), 1);
}
Interrupts::REC64 *recs = static_cast<Interrupts::REC64*>(idt.addr);
uintptr_t page = 0;
for (uint16_t i = 0; i < 0x100; i++) {
uintptr_t handler = (uintptr_t(recs[i].offset_low)
| (uintptr_t(recs[i].offset_middle) << 16)
| (uintptr_t(recs[i].offset_high) << 32));
if (page != (handler & KB4)) {
page = handler & KB4;
addPage(page, reinterpret_cast<void*>(page), 1);
}
}
uintptr_t handler, sc_wrapper;
asm volatile("lea __interrupt_wrap(%%rip), %q0":"=r"(handler));
asm volatile("lea _ZN7Syscall7wrapperEv(%%rip), %q0":"=r"(sc_wrapper));
handler &= KB4;
sc_wrapper &= KB4;
addPage(handler, reinterpret_cast<void*>(handler), 1);
addPage(sc_wrapper, reinterpret_cast<void*>(sc_wrapper), 1);
GDT::Entry *gdt_ent = reinterpret_cast<GDT::Entry*>(uintptr_t(gdt.addr) + 8 * 3);
GDT::Entry *gdt_top = reinterpret_cast<GDT::Entry*>(uintptr_t(gdt.addr) + gdt.limit);
if (!iomap[0]) {
iomap[0] = Pagetable::alloc();
Memory::fill(iomap[0], 0xFF, 0x1000);
}
if (!iomap[1]) {
iomap[1] = Pagetable::alloc();
Memory::fill(iomap[1], 0xFF, 0x1000);
}
while (gdt_ent < gdt_top) {
uintptr_t base = gdt_ent->getBase();
size_t limit = gdt_ent->getLimit();
if (((gdt_ent->type != 0x9) && (gdt_ent->type != 0xB)) || (limit != sizeof(TSS64_ENT) + 0x2000 - 1)) {
gdt_ent++;
continue;
}
GDT::SystemEntry *sysent = reinterpret_cast<GDT::SystemEntry*>(gdt_ent);
base = sysent->getBase();
uintptr_t page = base & KB4;
addPage(page, reinterpret_cast<void*>(page), 1);
addPage(page + 0x1000, iomap[0], 1);
addPage(page + 0x2000, iomap[1], 1);
TSS64_ENT *tss = reinterpret_cast<TSS64_ENT*>(base);
uintptr_t stack = tss->ist[0];
page = stack - 0x1000;
addPage(page, reinterpret_cast<void*>(page), 3);
gdt_ent = reinterpret_cast<GDT::Entry*>(sysent + 1);
}
Thread *thread = new Thread();
thread->regs.rip = entry;
thread->regs.rflags = 0;
id = (ProcessManager::getManager())->RegisterProcess(this);
addThread(thread, false);
}
void Process::exit(int code) {
printf("EXIT %d\n", code);
for (size_t i = 0; i < threads.getCount(); i++) {
ProcessManager::getManager()->dequeueThread(threads[i]);
}
delete this;
}
void Process::print_stacktrace(uintptr_t base, const Process *process) {
struct stackframe {
struct stackframe* rbp;
uintptr_t rip;
} __attribute__((packed));
printf("STACK TRACE:");
struct stackframe tmpframe;
const struct stackframe *frame;
if (base) {
frame = reinterpret_cast<struct stackframe*>(base);
} else {
asm volatile("mov %%rbp, %q0":"=r"(frame)::);
}
size_t lim = 10;
while (lim-- && frame != nullptr) {
if (process) {
process->readData(&tmpframe.rbp, uintptr_t(frame), sizeof(uintptr_t));
if (tmpframe.rbp) {
process->readData(&tmpframe.rip, uintptr_t(frame)+sizeof(uintptr_t), sizeof(uintptr_t));
} else {
break;
}
frame = &tmpframe;
}
printf(" [%p]:%p", frame->rbp, reinterpret_cast<void*>(frame->rip));
frame = frame->rbp;
}
printf("\n");
}