os/kernel/elf.c

#include <stdint.h>
#include <stddef.h>
#include <debugging.h>
#include <kernel/tty.h>
#include <kernel/gdt.h>
#include <kernel/task.h>
#include <debugging.h>

static void* memcpy(void* restrict dstptr, const void* restrict srcptr, size_t size) {
    unsigned char* dst = (unsigned char*) dstptr;
    const unsigned char* src = (const unsigned char*) srcptr;
    for (size_t i = 0; i < size; i++)
        dst[i] = src[i];
    return dstptr;
}

void run_program(void* code, size_t code_length, void* data, size_t data_length, struct Heap_Block* code_block, struct Heap_Block* data_block)
{
    // TODO: Replace following lines with malloc calls and paging calls
    memcpy(code_block->data, code, code_length);
    memcpy(data_block->data, data, data_length);

    struct CPUState target = {
        .eip = (size_t) 0x00400000,
        .esp = (size_t) 0x00801000,
        .eax = (size_t) 0x00800000,
        .ebx = data_length,
        .ecx = 0x00400000,
        .edx = 0,
        .cs = 0x18 | 0x3,
        .ds = 0x20 | 0x3,
        /// .cs = 0x08,
        // .ds = 0x10,
        .eflags = 0x0200,
        .ebp = 0,
    };

    struct Task task = {
        .state = target,
        .needs_pages = true,
        .code = code_block,
        .data = data_block,
    };

    add_task(task);
}