99 lines
3.4 KiB
Plaintext
99 lines
3.4 KiB
Plaintext
/* SPDX-License-Identifier: MIT OR Apache-2.0
|
|
*
|
|
* Copyright (c) 2018-2021 Andre Richter <andre.o.richter@gmail.com>
|
|
* Copyright (c) 2021- Berkus <berkus+github@metta.systems>
|
|
*/
|
|
|
|
/*
|
|
* Information from:
|
|
* [Output Section Address](https://sourceware.org/binutils/docs/ld/Output-Section-Address.html)
|
|
* [Output Section LMA](https://sourceware.org/binutils/docs/ld/Output-Section-LMA.html)
|
|
* [Output Section Attributes](https://sourceware.org/binutils/docs/ld/Output-Section-Attributes.html#Output-Section-Attributes)
|
|
*/
|
|
|
|
/* The physical address at which the the kernel binary will be loaded by the Raspberry's firmware */
|
|
__rpi_phys_binary_load_addr = 0x80000;
|
|
|
|
|
|
ENTRY(__rpi_phys_binary_load_addr)
|
|
|
|
/* Flags:
|
|
* 4 == R
|
|
* 5 == RX
|
|
* 6 == RW
|
|
*
|
|
* Segments are marked PT_LOAD below so that the ELF file provides virtual and physical addresses.
|
|
* It doesn't mean all of them need actually be loaded.
|
|
*/
|
|
PHDRS
|
|
{
|
|
segment_boot_core_stack PT_LOAD FLAGS(6);
|
|
segment_start_code PT_LOAD FLAGS(5);
|
|
segment_code PT_LOAD FLAGS(5);
|
|
segment_data PT_LOAD FLAGS(6);
|
|
}
|
|
|
|
SECTIONS
|
|
{
|
|
/***********************************************************************************************
|
|
* Boot Core Stack
|
|
***********************************************************************************************/
|
|
.boot_core_stack (NOLOAD) :
|
|
{
|
|
/* ^ */
|
|
/* | stack */
|
|
. += __rpi_phys_binary_load_addr; /* | growth */
|
|
/* | direction */
|
|
__boot_core_stack_end_exclusive = .; /* | */
|
|
} :segment_boot_core_stack
|
|
|
|
. = __rpi_phys_binary_load_addr;
|
|
|
|
.text :
|
|
{
|
|
KEEP(*(.text._start))
|
|
*(.text.stdmem)
|
|
} :segment_start_code
|
|
|
|
/* Align to 8 bytes, b/c relocating the binary is done in u64 chunks */
|
|
. = ALIGN(8);
|
|
|
|
__binary_nonzero_lma = .;
|
|
|
|
/* Set the link address to 32 MiB */
|
|
/* This dictates the max size of the loadable kernel. */
|
|
. += 0x2000000;
|
|
|
|
/***********************************************************************************************
|
|
* Code + RO Data + Global Offset Table
|
|
***********************************************************************************************/
|
|
__binary_nonzero_vma = .;
|
|
.text : AT (ADDR(.text) + SIZEOF(.text))
|
|
{
|
|
*(.text._start_rust) /* The Rust entry point */
|
|
/* *(text.memcpy) -- only relevant for Rust relocator impl which is currently impossible */
|
|
*(.text*) /* Everything else */
|
|
} :segment_code
|
|
|
|
.rodata : ALIGN(8) { *(.rodata*) } :segment_code
|
|
.got : ALIGN(8) { *(.got) } :segment_code
|
|
|
|
/***********************************************************************************************
|
|
* Data + BSS
|
|
***********************************************************************************************/
|
|
.data : { *(.data*) } :segment_data
|
|
|
|
/* Fill up to 8 bytes, b/c relocating the binary is done in u64 chunks */
|
|
. = ALIGN(8);
|
|
__binary_nonzero_vma_end_exclusive = .;
|
|
|
|
/* Section is zeroed in pairs of u64. Align start and end to 16 bytes */
|
|
.bss (NOLOAD) : ALIGN(16)
|
|
{
|
|
__bss_start = .;
|
|
*(.bss*);
|
|
. = ALIGN(16);
|
|
__bss_size = . - __bss_start;
|
|
} :segment_data
|
|
}
|