forked from BSB-WS23/mpstubs
120 lines
3.1 KiB
Plaintext
120 lines
3.1 KiB
Plaintext
/* Entry in our OS -- label 'startup_bsp' in file boot/startup.asm */
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ENTRY(startup_bsp)
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SECTIONS
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{
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/* start address of our kernel */
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. = 16M;
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/* This is a linker script defined "variable" (without value -- therefore
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* better to be considered as a symbol), which can be referenced in the C++
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* source code using `&___KERNEL_START___` (mind the reference operator!)
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* to get a pointer to the current (virtual) memory position.
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* However, a previous declaration with C linkage is required, e.g.
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* extern "C" void * ___KERNEL_START___;
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* For more information have a look at
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* https://sourceware.org/binutils/docs/ld/Source-Code-Reference.html
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*/
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___KERNEL_START___ = .;
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.boot :
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{
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/* Multiboot Header should be at the very beginning of the binary */
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*(.multiboot_header)
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}
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/* The (executable) machine code */
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.text :
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{
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*(.text .text.* .gnu.linkonce.t.*)
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*(.init)
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*(.fini)
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}
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/* Align to the next page border
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* allowing the linker to mark the section above as [read and] executable
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* while the following sections is just read-only. */
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. = ALIGN(0x1000);
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/* Start for application processors, relocated by APIC::init()
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* to a below 1 MB address to boot from real mode.
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*
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* Please note:
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* It is possible to let the linker place it at a below 1 MB address,
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* while all the rest starts at 16 MB. This will work for multiboot
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* compliant boot loader like GRUB and PXELINUX, however,
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* the qemu boot loader cannot handle such ELF files (yet)...
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* That's why we have to copy it ourself in the kernel */
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.setup_ap_seg ALIGN(0x10) :
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{
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___SETUP_AP_START__ = .;
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*(.setup_ap_seg)
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}
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___SETUP_AP_END__ = .;
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/* Read-only data */
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.rodata :
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{
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*(.rodata .rodata.* .gnu.linkonce.r.*)
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KEEP(*(.note.gnu.build-id))
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}
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/* Align to the next page border
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* allowing the linker to mark the section below as [read and] writeable */
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. = ALIGN(0x1000);
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/* lists containing the start address of global constructors and destructors (generated by the compiler) */
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.preinit_array :
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{
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PROVIDE_HIDDEN (__preinit_array_start = .);
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KEEP (*(.preinit_array))
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PROVIDE_HIDDEN (__preinit_array_end = .);
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}
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.init_array :
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{
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PROVIDE_HIDDEN (__init_array_start = .);
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KEEP (*(SORT(.init_array.*)))
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KEEP (*(.init_array))
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PROVIDE_HIDDEN (__init_array_end = .);
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}
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.fini_array :
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{
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PROVIDE_HIDDEN (__fini_array_start = .);
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KEEP (*(SORT(.fini_array.*)))
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KEEP (*(.fini_array))
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PROVIDE_HIDDEN (__fini_array_end = .);
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}
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/* the data section containing initialized static variables
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* (writeable with a value not zero) */
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.data :
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{
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*(.data .data.* .gnu.linkonce.d.*)
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/* Global offset table */
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*(.got*)
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/* Exception Handling */
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*(.eh_frame*)
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}
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/* the bss (block starting symbol) section containing uninitialized
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* static variables (writeable with an initial value of zero);
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* this section does not consume any memory in the binary */
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.bss :
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{
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*(.bss .bss.* .gnu.linkonce.b.*)
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*(COMMON)
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}
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___KERNEL_END___ = .;
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/* Sections which should not be included in the binary */
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/DISCARD/ :
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{
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*(.note)
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*(.comment)
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/* Debug information (commented out to keep it)
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*(.debug*)
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*/
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}
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}
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