blob: 08f3542affa9a45b2a84648bb38a2d735af9f0b9 [file] [log] [blame]
/* Copyright 2023 Google LLC. */
/* Licensed under the Apache License, Version 2.0, see LICENSE for details. */
/* SPDX-License-Identifier: Apache-2.0 */
/**
* A simple linker script for kelvin core.
*
* Memory layout:
*
* TCM_ORIGIN ---> +=====================+
* | |
* | .text |
* +---------------------|
* | .crt |
* +---------------------+
* | .rodata |
* +---------------------+
* | .init_array |
* +---------------------+
* | .data |
* +---------------------+
* | .bss |
* +---------------------+
* | .heap |
* | (All unclamied |
* | memory) |
* | |
* (TCM_END - stack ---> +---------------------+
* - model_output | .stack |
* - output_header) +---------------------+
* | .model_output |
* output_header (64B) ---> +---------------------+
* | .output_header |
* TCM_END ---> +=====================+
**/
MEMORY {
TCM(rwx): ORIGIN = 0x00000000, LENGTH = 0x400000
}
STACK_SIZE = DEFINED(STACK_SIZE) ? STACK_SIZE : DEFINED(__stack_size__) ? __stack_size__ : 0x4000;
OUTPUT_SIZE = DEFINED(OUTPUT_SIZE) ? OUTPUT_SIZE : DEFINED(__output_size__) ? __output_size__ : 0x40;
__output_header_size__ = 0x40;
ENTRY(_start)
SECTIONS {
. = ORIGIN(TCM);
.text : ALIGN(4) {
*(._init)
*(.text)
*(.text.*)
. = ALIGN(4);
__etext = .;
} > TCM
.init.array : ALIGN(4) {
__init_array_start = .;
*(.init_array)
*(.init_array.*)
. = ALIGN(4);
__init_array_end = .;
} > TCM
.rodata : ALIGN(4) {
*(.srodata)
*(.srodata.*)
*(.rodata)
*(.rodata.*)
. = ALIGN(4);
} > TCM
.data : ALIGN(4) {
__data_start__ = .;
/**
* This will get loaded into `gp`, and the linker will use that register for
* accessing data within [-2048,2047] of `__global_pointer$`.
*
* This is much cheaper (for small data) than materializing the
* address and loading from that (which will take one extra instruction).
*/
_global_pointer = . + 0x800;
*(.sdata)
*(.sdata.*)
*(.data)
*(.data.*)
/* Align on 256 width. */
. = ALIGN(256);
__data_end__ = .;
} > TCM
.bss : ALIGN(4) {
__bss_start__ = .;
*(.sbss)
*(.sbss.*)
*(.bss)
*(.bss.*)
__bss_end__ = .;
} > TCM
/* All the unclaimed memory is used in heap */
.heap (NOLOAD) : {
. = ALIGN(64);
__heap_start__ = .;
. = ORIGIN(TCM) + LENGTH(TCM) - STACK_SIZE - OUTPUT_SIZE - __output_header_size__ - 63;
. = ALIGN(64);
__heap_end__ = .;
} > TCM
.stack ORIGIN(TCM) + LENGTH(TCM) - STACK_SIZE - OUTPUT_SIZE - __output_header_size__ (NOLOAD) : {
__stack_start__ = .;
. += STACK_SIZE;
. = ALIGN(64);
__stack_end__ = .;
_stack_end = .;
} > TCM
.model_output ORIGIN(TCM) + LENGTH(TCM) - OUTPUT_SIZE - __output_header_size__ (NOLOAD) : {
. = ALIGN(64);
__model_output_start__ = .;
*(.model_output)
__model_output_end__ = .;
} > TCM
.output_header ORIGIN(TCM) + LENGTH(TCM) - __output_header_size__ (NOLOAD) : {
/*
* Model output information (return code and output location/length) is
* always at the end of TCM.
*/
__output_header_start__ = .;
_ret = .;
*(.model_output_header*)
__output_header_end__ = .;
} > TCM
}