process.cpp File Reference

Implementation of a Thread and Process classes for managing system processes. More...

#include <processes/process.h>
#include <common/logger.h>
#include <processes/scheduler.h>

Go to the source code of this file.

Functions
void	save_cpu_state_naked (volatile void *location) __attribute__((naked))
	Save the state of the CPU at the exit of this function.

Detailed Description

Implementation of a Thread and Process classes for managing system processes.

Date

25th February 2025

Author

Max Tyson

Definition in file process.cpp.

Function Documentation

save_cpu_state_naked()

void save_cpu_state_naked

(

volatile void *

location

)

Save the state of the CPU at the exit of this function.

Parameters

location

Where to save the state to

Definition at line 153 of file process.cpp.

                                                              {
    asm volatile(
 
        // Save registers
        "pushq %rax\n"
        "pushq %rbx\n"
        "pushq %rcx\n"
        "pushq %rdx\n"
        "pushq %rbp\n"
        "pushq %rsi\n"
        "pushq %rdi\n"
        "pushq %r8\n"
        "pushq %r9\n"
        "pushq %r10\n"
        "pushq %r11\n"
        "pushq %r12\n"
        "pushq %r13\n"
        "pushq %r14\n"
        "pushq %r15\n"
 
        // Store the save location
        "movq %rdi, %rsi\n"
 
        // Save general registers
        "movq   0(%rsp), %rax\n"   "movq %rax, 0x00(%rsi)\n"
        "movq   8(%rsp), %rax\n"   "movq %rax, 0x08(%rsi)\n"
        "movq  16(%rsp), %rax\n"   "movq %rax, 0x10(%rsi)\n"
        "movq  24(%rsp), %rax\n"   "movq %rax, 0x18(%rsi)\n"
        "movq  32(%rsp), %rax\n"   "movq %rax, 0x20(%rsi)\n"
        "movq  40(%rsp), %rax\n"   "movq %rax, 0x28(%rsi)\n"
        "movq  48(%rsp), %rax\n"   "movq %rax, 0x30(%rsi)\n"
        "movq  56(%rsp), %rax\n"   "movq %rax, 0x38(%rsi)\n"
        "movq  64(%rsp), %rax\n"   "movq %rax, 0x40(%rsi)\n"
        "movq  72(%rsp), %rax\n"   "movq %rax, 0x48(%rsi)\n"
        "movq  80(%rsp), %rax\n"   "movq %rax, 0x50(%rsi)\n"
        "movq  88(%rsp), %rax\n"   "movq %rax, 0x58(%rsi)\n"
        "movq  96(%rsp), %rax\n"   "movq %rax, 0x60(%rsi)\n"
        "movq 104(%rsp), %rax\n"   "movq %rax, 0x68(%rsi)\n"
        "movq 112(%rsp), %rax\n"   "movq %rax, 0x70(%rsi)\n"
 
        // Save the return address as the instruction pointer
        "movq 120(%rsp), %rax\n"
        "movq %rax, 0x88(%rsi)\n"
 
        // CS
        "xorq %rax, %rax\n"
        "movw %cs, %ax\n"
        "movq %rax, 0x90(%rsi)\n"
 
        // RFLAGS
        "pushfq\n"
        "popq %rax\n"
        "movq %rax, 0x98(%rsi)\n"
 
        // RSP
        "leaq 120(%rsp), %rax\n"
        "movq %rax, 0xA0(%rsi)\n"
 
        // SS
        "xorq %rax, %rax\n"
        "movw %ss, %ax\n"
        "movq %rax, 0xA8(%rsi)\n"
 
        // Restore registers
        "popq %r15\n"
        "popq %r14\n"
        "popq %r13\n"
        "popq %r12\n"
        "popq %r11\n"
        "popq %r10\n"
        "popq %r9\n"
        "popq %r8\n"
        "popq %rdi\n"
        "popq %rsi\n"
        "popq %rbp\n"
        "popq %rdx\n"
        "popq %rcx\n"
        "popq %rbx\n"
        "popq %rax\n"
        "ret\n"
    );
}

Referenced by MaxOS::processes::Thread::save_cpu_state().