1/* 2 * Copyright (c) 2019-2021 Intel Corp. 3 * SPDX-License-Identifier: Apache-2.0 4 */ 5 6#include <zephyr/linker/linker-defs.h> 7#include <zephyr/linker/linker-tool.h> 8 9#define ROMABLE_REGION RAM 10#define RAMABLE_REGION RAM 11 12#define MMU_PAGE_ALIGN . = ALIGN(CONFIG_MMU_PAGE_SIZE); 13 14/* Used to align areas with separate memory permission characteristics 15 * so that the page permissions can be set in the MMU. Without this, 16 * the kernel is just one blob with the same RWX permissions on all RAM 17 */ 18#ifdef CONFIG_SRAM_REGION_PERMISSIONS 19 #define MMU_PAGE_ALIGN_PERM MMU_PAGE_ALIGN 20#else 21 #define MMU_PAGE_ALIGN_PERM 22#endif 23 24ENTRY(CONFIG_KERNEL_ENTRY) 25 26SECTIONS 27{ 28 /* 29 * The "locore" must be in the 64K of RAM, so that 16-bit code (with 30 * segment registers == 0x0000) and 32/64-bit code agree on addresses. 31 * ... there is no 16-bit code yet, but there will be when we add SMP. 32 */ 33 34 SECTION_PROLOGUE(.locore,,) 35 { 36 _locore_start = .; 37 *(.locore) 38 *(.locore.*) 39 MMU_PAGE_ALIGN_PERM 40 _locore_end = .; 41 42 _lorodata_start = .; 43 *(.lorodata) 44 MMU_PAGE_ALIGN_PERM 45 _lodata_start = .; 46 47 *(.lodata) 48 49#ifdef CONFIG_X86_KPTI 50 /* Special page containing supervisor data that is still mapped in 51 * user mode page tables. GDT, TSSes, trampoline stack, and 52 * any LDT must go here as they always must live in a page that is 53 * marked 'present'. Still not directly user accessible, but 54 * no sensitive data should be here as Meltdown exploits may read it. 55 * 56 * On x86-64 the IDT is in rodata and doesn't need to be in the 57 * trampoline page. 58 */ 59 MMU_PAGE_ALIGN_PERM 60 z_shared_kernel_page_start = .; 61#endif /* CONFIG_X86_KPTI */ 62 63 *(.boot_arg) 64 *(.tss) 65 *(.gdt) 66 67#ifdef CONFIG_X86_KPTI 68 *(.trampolines) 69 MMU_PAGE_ALIGN_PERM 70 z_shared_kernel_page_end = .; 71 72 ASSERT(z_shared_kernel_page_end - z_shared_kernel_page_start == 4096, 73 "shared kernel area is not one memory page"); 74#endif /* CONFIG_X86_KPTI */ 75 76 . = ALIGN(CONFIG_MMU_PAGE_SIZE); 77 _lodata_end = .; 78 } > LOCORE 79 80 _locore_size = _lorodata_start - _locore_start; 81 _lorodata_size = _lodata_start - _lorodata_start; 82 _lodata_size = _lodata_end - _lodata_start; 83 84 /* 85 * The rest of the system is loaded in "normal" memory (typically 86 * placed above 1MB to avoid the by memory hole at 0x90000-0xFFFFF). 87 */ 88 89 SECTION_PROLOGUE(_TEXT_SECTION_NAME,,) 90 { 91 . = ALIGN(16); 92 __rom_region_start = .; 93 __text_region_start = .; 94 z_mapped_start = .; 95 *(.text) 96 *(.text.*) 97 98 #include <zephyr/linker/kobject-text.ld> 99 100 MMU_PAGE_ALIGN_PERM 101 } GROUP_ROM_LINK_IN(RAMABLE_REGION, ROMABLE_REGION) 102 103 __text_region_end = .; 104 __text_region_size = __text_region_end - __text_region_start; 105 __rodata_region_start = .; 106 107 #include <zephyr/linker/common-rom.ld> 108 #include <zephyr/linker/thread-local-storage.ld> 109 110 SECTION_PROLOGUE(_RODATA_SECTION_NAME,,) 111 { 112 . = ALIGN(16); 113 *(.rodata) 114 *(.rodata.*) 115 116 MMU_PAGE_ALIGN 117 #include <snippets-rodata.ld> 118 119#ifdef CONFIG_X86_MMU 120 . = ALIGN(8); 121 _mmu_region_list_start = .; 122 KEEP(*("._mmu_region.static.*")) 123 _mmu_region_list_end = .; 124#endif /* CONFIG_X86_MMU */ 125 126 #include <zephyr/linker/kobject-rom.ld> 127 } GROUP_ROM_LINK_IN(RAMABLE_REGION, ROMABLE_REGION) 128 129#include <zephyr/linker/cplusplus-rom.ld> 130 131 MMU_PAGE_ALIGN_PERM 132 __rodata_region_end = .; 133 __rodata_region_size = __rodata_region_end - __rodata_region_start; 134 __rom_region_end = .; 135 136#ifdef CONFIG_USERSPACE 137 /* APP SHARED MEMORY REGION */ 138#define SMEM_PARTITION_ALIGN(size) MMU_PAGE_ALIGN_PERM 139#define APP_SHARED_ALIGN MMU_PAGE_ALIGN_PERM 140 141#include <app_smem.ld> 142 143 _image_ram_start = _app_smem_start; 144 _app_smem_size = _app_smem_end - _app_smem_start; 145 _app_smem_num_words = _app_smem_size >> 2; 146 _app_smem_rom_start = LOADADDR(_APP_SMEM_SECTION_NAME); 147 _app_smem_num_words = _app_smem_size >> 2; 148#endif /* CONFIG_USERSPACE */ 149 150/* This should be put here before BSS section, otherwise the .bss.__gcov will 151 * be put in BSS section. That causes gcov not work properly */ 152#include <snippets-ram-sections.ld> 153 154 SECTION_PROLOGUE(_BSS_SECTION_NAME, (NOLOAD),) 155 { 156 . = ALIGN(16); 157 MMU_PAGE_ALIGN_PERM 158#ifndef CONFIG_USERSPACE 159 _image_ram_start = .; 160#endif 161 __kernel_ram_start = .; 162 __bss_start = .; 163 *(.bss) 164 *(.bss.*) 165 *(COMMON) 166 . = ALIGN(4); /* so __bss_num_dwords is exact */ 167 __bss_end = .; 168 } GROUP_NOLOAD_LINK_IN(RAMABLE_REGION, ROMABLE_REGION) 169 170 __bss_num_dwords = (__bss_end - __bss_start) >> 2; 171 172#include <zephyr/linker/common-noinit.ld> 173 174#include <snippets-sections.ld> 175 176 SECTION_PROLOGUE(_DATA_SECTION_NAME,,) 177 { 178 . = ALIGN(16); 179 *(.data) 180 *(.data.*) 181 #include <snippets-rwdata.ld> 182 } GROUP_DATA_LINK_IN(RAMABLE_REGION, ROMABLE_REGION) 183 184#include <zephyr/linker/common-ram.ld> 185#include <zephyr/linker/cplusplus-ram.ld> 186#include <zephyr/arch/x86/pagetables.ld> 187 188/* Located in generated directory. This file is populated by the 189 * zephyr_linker_sources() Cmake function. 190 */ 191#include <snippets-data-sections.ld> 192 193/* Must be last in RAM */ 194#include <zephyr/linker/kobject-data.ld> 195 196#define LAST_RAM_ALIGN MMU_PAGE_ALIGN 197 198#include <zephyr/linker/ram-end.ld> 199 200 GROUP_END(RAMABLE_REGION) 201 202 /* All unused memory also owned by the kernel for heaps */ 203 __kernel_ram_end = KERNEL_BASE_ADDR + KERNEL_RAM_SIZE; 204 __kernel_ram_size = __kernel_ram_end - __kernel_ram_start; 205 206 z_mapped_size = z_mapped_end - z_mapped_start; 207 208#include <zephyr/linker/debug-sections.ld> 209 210 /DISCARD/ : 211 { 212 *(.got) 213 *(.got.plt) 214 *(.igot) 215 *(.igot.plt) 216 *(.iplt) 217 *(.plt) 218 *(.note.GNU-stack) 219 *(.rel.*) 220 *(.rela.*) 221 } 222/* 223 * eh_frame section won't be removed even with "--gc-sections" by LLVM lld. 224 */ 225#if !defined(CONFIG_CPP_EXCEPTIONS) 226 /DISCARD/ : { *(.eh_frame) } 227#endif 228 229/* 230 * The sections below are still treated as warnings 231 * with "--orphan-handling=warn" by LLVM lld. 232 */ 233#if !defined(CONFIG_LLVM_USE_LD) 234 .symtab 0 : { *(.symtab) } 235 .strtab 0 : { *(.strtab) } 236 .shstrtab 0 : { *(.shstrtab) } 237#endif 238 239} 240
