ableos/kernel/lds/x86_64.ld
2023-05-15 02:19:34 -05:00

55 lines
1.5 KiB
Plaintext

/* Tell the linker that we want an x86_64 ELF64 output file */
OUTPUT_FORMAT(elf64-x86-64)
OUTPUT_ARCH(i386:x86-64)
ENTRY(_kernel_start)
/* Define the program headers we want so the bootloader gives us the right */
/* MMU permissions */
PHDRS
{
null PT_NULL FLAGS(0) ; /* Null segment */
text PT_LOAD FLAGS((1 << 0) | (1 << 2)) ; /* Execute + Read */
rodata PT_LOAD FLAGS((1 << 2)) ; /* Read only */
data PT_LOAD FLAGS((1 << 1) | (1 << 2)) ; /* Write + Read */
}
SECTIONS
{
/* We wanna be placed in the topmost 2GiB of the address space, for optimisations */
/* and because that is what the Limine spec mandates. */
/* Any address in this region will do, but often 0xffffffff80000000 is chosen as */
/* that is the beginning of the region. */
. = 0xffffffff80000000;
.text : {
*(.text .text.*)
} :text
/* Align .rodata to page boundary */
. = ALIGN(4K);
.rodata : {
*(.rodata .rodata.*)
} :rodata
/* Align .data to page boundary */
. = ALIGN(4K);
.data : {
*(.data .data.*)
} :data
.bss : {
*(COMMON)
*(.bss .bss.*)
/* Align initial kernel heap to page boundary */
. = ALIGN(4K);
PROVIDE(_initial_kernel_heap_start = .);
/* PROVIDE(_initial_kernel_heap_size = 1024 * 1024); */
PROVIDE(_initial_kernel_heap_size = 1024 * 4096);
. += _initial_kernel_heap_size;
} :data
}