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204 lines
6.3 KiB
204 lines
6.3 KiB
/*
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* Copyright 2020 The Pigweed Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not
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* use this file except in compliance with the License. You may obtain a copy of
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* the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations under
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* the License.
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*/
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/* This relatively simplified linker script will work with many ARMv7-M cores
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* that have on-board memory-mapped RAM and FLASH. For more complex projects and
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* devices, it's possible this linker script will not be sufficient as-is.
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*
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* This linker script is likely not suitable for a project with a bootloader.
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*/
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/* Provide useful error messages when required configurations are not set. */
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#ifndef PW_BOOT_VECTOR_TABLE_BEGIN
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#error "PW_BOOT_VECTOR_TABLE_BEGIN is not defined, and is required to use pw_boot_armv7m"
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#endif // PW_BOOT_VECTOR_TABLE_BEGIN
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#ifndef PW_BOOT_VECTOR_TABLE_SIZE
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#error "PW_BOOT_VECTOR_TABLE_SIZE is not defined, and is required to use pw_boot_armv7m"
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#endif // PW_BOOT_VECTOR_TABLE_SIZE
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#ifndef PW_BOOT_FLASH_BEGIN
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#error "PW_BOOT_FLASH_BEGIN is not defined, and is required to use pw_boot_armv7m"
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#endif // PW_BOOT_FLASH_BEGIN
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#ifndef PW_BOOT_FLASH_SIZE
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#error "PW_BOOT_FLASH_SIZE is not defined, and is required to use pw_boot_armv7m"
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#endif // PW_BOOT_FLASH_SIZE
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#ifndef PW_BOOT_RAM_BEGIN
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#error "PW_BOOT_RAM_BEGIN is not defined, and is required to use pw_boot_armv7m"
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#endif // PW_BOOT_RAM_BEGIN
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#ifndef PW_BOOT_RAM_SIZE
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#error "PW_BOOT_RAM_SIZE is not defined, and is required to use pw_boot_armv7m"
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#endif // PW_BOOT_RAM_SIZE
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#ifndef PW_BOOT_HEAP_SIZE
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#error "PW_BOOT_HEAP_SIZE is not defined, and is required to use pw_boot_armv7m"
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#endif // PW_BOOT_HEAP_SIZE
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#ifndef PW_BOOT_MIN_STACK_SIZE
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#error "PW_BOOT_MIN_STACK_SIZE is not defined, and is required to use pw_boot_armv7m"
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#endif // PW_BOOT_MIN_STACK_SIZE
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/* Note: This technically doesn't set the firmware's entry point. Setting the
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* firmware entry point is done by setting vector_table[1]
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* (Reset_Handler). However, this DOES tell the compiler how to optimize
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* when --gc-sections is enabled.
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*/
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ENTRY(pw_boot_Entry)
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MEMORY
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{
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/* TODO(pwbug/57): Make it possible for projects to freely customize
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* memory regions.
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*/
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/* Vector Table (typically in flash) */
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VECTOR_TABLE(rx) : \
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ORIGIN = PW_BOOT_VECTOR_TABLE_BEGIN, \
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LENGTH = PW_BOOT_VECTOR_TABLE_SIZE
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/* Internal Flash */
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FLASH(rx) : \
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ORIGIN = PW_BOOT_FLASH_BEGIN, \
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LENGTH = PW_BOOT_FLASH_SIZE
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/* Internal SRAM */
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RAM(rwx) : \
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ORIGIN = PW_BOOT_RAM_BEGIN, \
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LENGTH = PW_BOOT_RAM_SIZE
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}
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SECTIONS
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{
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/* This is the link-time vector table. If used, the VTOR (Vector Table Offset
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* Register) MUST point to this memory location in order to be used. This can
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* be done by ensuring this section exists at the default location of the VTOR
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* so it's used on reset, or by explicitly setting the VTOR in a bootloader
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* manually to point to &pw_boot_vector_table_addr before interrupts are enabled.
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*/
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.vector_table : ALIGN(512)
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{
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pw_boot_vector_table_addr = .;
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KEEP(*(.vector_table))
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} >VECTOR_TABLE
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/* Main executable code. */
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.code : ALIGN(8)
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{
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. = ALIGN(8);
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/* Application code. */
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*(.text)
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*(.text*)
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KEEP(*(.init))
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KEEP(*(.fini))
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. = ALIGN(8);
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/* Constants.*/
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*(.rodata)
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*(.rodata*)
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/* .preinit_array, .init_array, .fini_array are used by libc.
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* Each section is a list of function pointers that are called pre-main and
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* post-exit for object initialization and tear-down.
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* Since the region isn't explicitly referenced, specify KEEP to prevent
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* link-time garbage collection. SORT is used for sections that have strict
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* init/de-init ordering requirements. */
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. = ALIGN(8);
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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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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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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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} >FLASH
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/* Used by unwind-arm/ */
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.ARM : ALIGN(8) {
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__exidx_start = .;
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*(.ARM.exidx*)
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__exidx_end = .;
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} >FLASH
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/* Explicitly initialized global and static data. (.data)*/
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.static_init_ram : ALIGN(8)
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{
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*(.data)
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*(.data*)
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. = ALIGN(8);
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} >RAM AT> FLASH
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/* Zero initialized global/static data. (.bss)
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* This section is zero initialized in pw_boot_Entry(). */
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.zero_init_ram : ALIGN(8)
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{
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*(.bss)
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*(.bss*)
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*(COMMON)
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. = ALIGN(8);
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} >RAM
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.heap : ALIGN(8)
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{
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pw_boot_heap_low_addr = .;
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. = . + PW_BOOT_HEAP_SIZE;
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. = ALIGN(8);
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pw_boot_heap_high_addr = .;
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} >RAM
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/* Link-time check for stack overlaps. */
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.stack (NOLOAD) : ALIGN(8)
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{
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/* Set the address that the main stack pointer should be initialized to. */
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pw_boot_stack_low_addr = .;
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HIDDEN(_stack_size = ORIGIN(RAM) + LENGTH(RAM) - .);
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/* Align the stack to a lower address to ensure it isn't out of range. */
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HIDDEN(_stack_high = (. + _stack_size) & ~0x7);
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ASSERT(_stack_high - . >= PW_BOOT_MIN_STACK_SIZE,
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"Error: Not enough RAM for desired minimum stack size.");
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. = _stack_high;
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pw_boot_stack_high_addr = .;
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} >RAM
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/* Discard unwind info. */
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.ARM.extab 0x0 (INFO) :
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{
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KEEP(*(.ARM.extab*))
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}
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}
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/* Symbols used by core_init.c: */
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/* Start of .static_init_ram in FLASH. */
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_pw_static_init_flash_start = LOADADDR(.static_init_ram);
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/* Region of .static_init_ram in RAM. */
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_pw_static_init_ram_start = ADDR(.static_init_ram);
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_pw_static_init_ram_end = _pw_static_init_ram_start + SIZEOF(.static_init_ram);
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/* Region of .zero_init_ram. */
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_pw_zero_init_ram_start = ADDR(.zero_init_ram);
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_pw_zero_init_ram_end = _pw_zero_init_ram_start + SIZEOF(.zero_init_ram);
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/* arm-none-eabi expects `end` symbol to point to start of heap for sbrk. */
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PROVIDE(end = _pw_zero_init_ram_end);
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