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/* Copyright (c) 2020 Johannes Stoelp */
#include "thread.h"
#include "arch/x86_64/asm.h"
#include "executor.h"
#include <cassert>
#include <cstdint> // uintN_t
#include <sys/mman.h> // mmap
#include <unistd.h> // sysconf
namespace {
static long get_pagesize() { return sysconf(_SC_PAGESIZE); }
} // namespace
namespace nMatcha {
Thread::Thread() {
const long PAGE_SIZE = get_pagesize();
const long STACK_SIZE = 8 * PAGE_SIZE;
// create new stack
void* stack = mmap(nullptr, STACK_SIZE, PROT_WRITE | PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS, -1 /* fd */, 0 /* offset */);
assert(stack != MAP_FAILED);
// protect last stack page (lowest addr)
int ret = mprotect(stack, PAGE_SIZE, PROT_NONE);
assert(ret == 0);
// stack grows downwards
mStackPtr = static_cast<uint8_t*>(stack) + STACK_SIZE;
{
uint64_t* stack = static_cast<uint64_t*>(mStackPtr);
*(--stack) = (uint64_t)this;
*(--stack) = (uint64_t)Thread::entry;
// initial values for yield epilog
*(--stack) = (uint64_t)thread_create;
*(--stack) = (uint64_t)0;
// initial values for callee saved regs
*(--stack) = (uint64_t)0; // rbx
*(--stack) = (uint64_t)(static_cast<uint64_t*>(mStackPtr) - 4); // rbp
*(--stack) = (uint64_t)0; // r12
*(--stack) = (uint64_t)0; // r13
*(--stack) = (uint64_t)0; // r14
*(--stack) = (uint64_t)0; // r15
mStackPtr = static_cast<void*>(stack);
}
}
void Thread::entry(void* obj) {
Thread* t = static_cast<Thread*>(obj);
t->threadFn();
}
void Thread::yield() {
assert(mExecutor);
::yield(mExecutor->getStackPtr(), &mStackPtr);
}
} // namespace nMatcha
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