/* SPDX-License-Identifier: GPL-2.0 */
/*
 * ld script for the x86 kernel
 *
 * Historic 32-bit version written by Martin Mares <mj@atrey.karlin.mff.cuni.cz>
 *
 * Modernisation, unification and other changes and fixes:
 *   Copyright (C) 2007-2009  Sam Ravnborg <sam@ravnborg.org>
 *
 *
 * Don't define absolute symbols until and unless you know that symbol
 * value is should remain constant even if kernel image is relocated
 * at run time. Absolute symbols are not relocated. If symbol value should
 * change if kernel is relocated, make the symbol section relative and
 * put it inside the section definition.
 */

#ifdef CONFIG_X86_32
#define LOAD_OFFSET __PAGE_OFFSET
#else
#define LOAD_OFFSET __START_KERNEL_map
#endif

#define RUNTIME_DISCARD_EXIT
#define EMITS_PT_NOTE
#define RO_EXCEPTION_TABLE_ALIGN        16

#include <asm-generic/vmlinux.lds.h>
#include <asm/asm-offsets.h>
#include <asm/thread_info.h>
#include <asm/page_types.h>
#include <asm/orc_lookup.h>
#include <asm/cache.h>
#include <asm/boot.h>

#undef i386     /* in case the preprocessor is a 32bit one */

OUTPUT_FORMAT(CONFIG_OUTPUT_FORMAT)

#ifdef CONFIG_X86_32
OUTPUT_ARCH(i386)
ENTRY(phys_startup_32)
#else
OUTPUT_ARCH(i386:x86-64)
ENTRY(phys_startup_64)
#endif

jiffies = jiffies_64;

#if defined(CONFIG_X86_64)
/*
 * On 64-bit, align RODATA to 2MB so we retain large page mappings for
 * boundaries spanning kernel text, rodata and data sections.
 *
 * However, kernel identity mappings will have different RWX permissions
 * to the pages mapping to text and to the pages padding (which are freed) the
 * text section. Hence kernel identity mappings will be broken to smaller
 * pages. For 64-bit, kernel text and kernel identity mappings are different,
 * so we can enable protection checks as well as retain 2MB large page
 * mappings for kernel text.
 */
#define X86_ALIGN_RODATA_BEGIN  . = ALIGN(HPAGE_SIZE);

#define X86_ALIGN_RODATA_END                                    \
                . = ALIGN(HPAGE_SIZE);                          \
                __end_rodata_hpage_align = .;                   \
                __end_rodata_aligned = .;

#define ALIGN_ENTRY_TEXT_BEGIN  . = ALIGN(PMD_SIZE);
#define ALIGN_ENTRY_TEXT_END    . = ALIGN(PMD_SIZE);

/*
 * This section contains data which will be mapped as decrypted. Memory
 * encryption operates on a page basis. Make this section PMD-aligned
 * to avoid splitting the pages while mapping the section early.
 *
 * Note: We use a separate section so that only this section gets
 * decrypted to avoid exposing more than we wish.
 */
#define BSS_DECRYPTED                                           \
        . = ALIGN(PMD_SIZE);                                    \
        __start_bss_decrypted = .;                              \
        *(.bss..decrypted);                                     \
        . = ALIGN(PAGE_SIZE);                                   \
        __start_bss_decrypted_unused = .;                       \
        . = ALIGN(PMD_SIZE);                                    \
        __end_bss_decrypted = .;                                \

#else

#define X86_ALIGN_RODATA_BEGIN
#define X86_ALIGN_RODATA_END                                    \
                . = ALIGN(PAGE_SIZE);                           \
                __end_rodata_aligned = .;

#define ALIGN_ENTRY_TEXT_BEGIN
#define ALIGN_ENTRY_TEXT_END
#define BSS_DECRYPTED

#endif

PHDRS {
        text PT_LOAD FLAGS(5);          /* R_E */
        data PT_LOAD FLAGS(6);          /* RW_ */
#ifdef CONFIG_X86_64
#ifdef CONFIG_SMP
        percpu PT_LOAD FLAGS(6);        /* RW_ */
#endif
        init PT_LOAD FLAGS(7);          /* RWE */
#endif
        note PT_NOTE FLAGS(0);          /* ___ */
}

SECTIONS
{
#ifdef CONFIG_X86_32
        . = LOAD_OFFSET + LOAD_PHYSICAL_ADDR;
        phys_startup_32 = ABSOLUTE(startup_32 - LOAD_OFFSET);
#else
        . = __START_KERNEL;
        phys_startup_64 = ABSOLUTE(startup_64 - LOAD_OFFSET);
#endif

        /* Text and read-only data */
        .text :  AT(ADDR(.text) - LOAD_OFFSET) {
                _text = .;
                _stext = .;
                /* bootstrapping code */
                HEAD_TEXT
                TEXT_TEXT
                SCHED_TEXT
                CPUIDLE_TEXT
                LOCK_TEXT
                KPROBES_TEXT
                ALIGN_ENTRY_TEXT_BEGIN
                ENTRY_TEXT
                ALIGN_ENTRY_TEXT_END
                SOFTIRQENTRY_TEXT
                STATIC_CALL_TEXT
                *(.fixup)
                *(.gnu.warning)

#ifdef CONFIG_RETPOLINE
                __indirect_thunk_start = .;
                *(.text.__x86.indirect_thunk)
                __indirect_thunk_end = .;
#endif
        } :text =0xcccc

        /* End of text section, which should occupy whole number of pages */
        _etext = .;
        . = ALIGN(PAGE_SIZE);

        X86_ALIGN_RODATA_BEGIN
        RO_DATA(PAGE_SIZE)
        X86_ALIGN_RODATA_END

        /* Data */
        .data : AT(ADDR(.data) - LOAD_OFFSET) {
                /* Start of data section */
                _sdata = .;

                /* init_task */
                INIT_TASK_DATA(THREAD_SIZE)

#ifdef CONFIG_X86_32
                /* 32 bit has nosave before _edata */
                NOSAVE_DATA
#endif

                PAGE_ALIGNED_DATA(PAGE_SIZE)

                CACHELINE_ALIGNED_DATA(L1_CACHE_BYTES)

                DATA_DATA
                CONSTRUCTORS

                /* rarely changed data like cpu maps */
                READ_MOSTLY_DATA(INTERNODE_CACHE_BYTES)

                /* End of data section */
                _edata = .;
        } :data

        BUG_TABLE

        ORC_UNWIND_TABLE

        . = ALIGN(PAGE_SIZE);
        __vvar_page = .;

        .vvar : AT(ADDR(.vvar) - LOAD_OFFSET) {
                /* work around gold bug 13023 */
                __vvar_beginning_hack = .;

                /* Place all vvars at the offsets in asm/vvar.h. */
#define EMIT_VVAR(name, offset)                         \
                . = __vvar_beginning_hack + offset;     \
                *(.vvar_ ## name)
#include <asm/vvar.h>
#undef EMIT_VVAR

                /*
                 * Pad the rest of the page with zeros.  Otherwise the loader
                 * can leave garbage here.
                 */
                . = __vvar_beginning_hack + PAGE_SIZE;
        } :data

        . = ALIGN(__vvar_page + PAGE_SIZE, PAGE_SIZE);

        /* Init code and data - will be freed after init */
        . = ALIGN(PAGE_SIZE);
        .init.begin : AT(ADDR(.init.begin) - LOAD_OFFSET) {
                __init_begin = .; /* paired with __init_end */
        }

#if defined(CONFIG_X86_64) && defined(CONFIG_SMP)
        /*
         * percpu offsets are zero-based on SMP.  PERCPU_VADDR() changes the
         * output PHDR, so the next output section - .init.text - should
         * start another segment - init.
         */
        PERCPU_VADDR(INTERNODE_CACHE_BYTES, 0, :percpu)
        ASSERT(SIZEOF(.data..percpu) < CONFIG_PHYSICAL_START,
               "per-CPU data too large - increase CONFIG_PHYSICAL_START")
#endif

        INIT_TEXT_SECTION(PAGE_SIZE)
#ifdef CONFIG_X86_64
        :init
#endif

        /*
         * Section for code used exclusively before alternatives are run. All
         * references to such code must be patched out by alternatives, normally
         * by using X86_FEATURE_ALWAYS CPU feature bit.
         *
         * See static_cpu_has() for an example.
         */
        .altinstr_aux : AT(ADDR(.altinstr_aux) - LOAD_OFFSET) {
                *(.altinstr_aux)
        }

        INIT_DATA_SECTION(16)

        .x86_cpu_dev.init : AT(ADDR(.x86_cpu_dev.init) - LOAD_OFFSET) {
                __x86_cpu_dev_start = .;
                *(.x86_cpu_dev.init)
                __x86_cpu_dev_end = .;
        }

#ifdef CONFIG_X86_INTEL_MID
        .x86_intel_mid_dev.init : AT(ADDR(.x86_intel_mid_dev.init) - \
                                                                LOAD_OFFSET) {
                __x86_intel_mid_dev_start = .;
                *(.x86_intel_mid_dev.init)
                __x86_intel_mid_dev_end = .;
        }
#endif

        /*
         * start address and size of operations which during runtime
         * can be patched with virtualization friendly instructions or
         * baremetal native ones. Think page table operations.
         * Details in paravirt_types.h
         */
        . = ALIGN(8);
        .parainstructions : AT(ADDR(.parainstructions) - LOAD_OFFSET) {
                __parainstructions = .;
                *(.parainstructions)
                __parainstructions_end = .;
        }

        /*
         * struct alt_inst entries. From the header (alternative.h):
         * "Alternative instructions for different CPU types or capabilities"
         * Think locking instructions on spinlocks.
         */
        . = ALIGN(8);
        .altinstructions : AT(ADDR(.altinstructions) - LOAD_OFFSET) {
                __alt_instructions = .;
                *(.altinstructions)
                __alt_instructions_end = .;
        }

        /*
         * And here are the replacement instructions. The linker sticks
         * them as binary blobs. The .altinstructions has enough data to
         * get the address and the length of them to patch the kernel safely.
         */
        .altinstr_replacement : AT(ADDR(.altinstr_replacement) - LOAD_OFFSET) {
                *(.altinstr_replacement)
        }

        /*
         * struct iommu_table_entry entries are injected in this section.
         * It is an array of IOMMUs which during run time gets sorted depending
         * on its dependency order. After rootfs_initcall is complete
         * this section can be safely removed.
         */
        .iommu_table : AT(ADDR(.iommu_table) - LOAD_OFFSET) {
                __iommu_table = .;
                *(.iommu_table)
                __iommu_table_end = .;
        }

        . = ALIGN(8);
        .apicdrivers : AT(ADDR(.apicdrivers) - LOAD_OFFSET) {
                __apicdrivers = .;
                *(.apicdrivers);
                __apicdrivers_end = .;
        }

        . = ALIGN(8);
        /*
         * .exit.text is discarded at runtime, not link time, to deal with
         *  references from .altinstructions
         */
        .exit.text : AT(ADDR(.exit.text) - LOAD_OFFSET) {
                EXIT_TEXT
        }

        .exit.data : AT(ADDR(.exit.data) - LOAD_OFFSET) {
                EXIT_DATA
        }

#if !defined(CONFIG_X86_64) || !defined(CONFIG_SMP)
        PERCPU_SECTION(INTERNODE_CACHE_BYTES)
#endif

        . = ALIGN(PAGE_SIZE);

        /* freed after init ends here */
        .init.end : AT(ADDR(.init.end) - LOAD_OFFSET) {
                __init_end = .;
        }

        /*
         * smp_locks might be freed after init
         * start/end must be page aligned
         */
        . = ALIGN(PAGE_SIZE);
        .smp_locks : AT(ADDR(.smp_locks) - LOAD_OFFSET) {
                __smp_locks = .;
                *(.smp_locks)
                . = ALIGN(PAGE_SIZE);
                __smp_locks_end = .;
        }

#ifdef CONFIG_X86_64
        .data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) {
                NOSAVE_DATA
        }
#endif

        /* BSS */
        . = ALIGN(PAGE_SIZE);
        .bss : AT(ADDR(.bss) - LOAD_OFFSET) {
                __bss_start = .;
                *(.bss..page_aligned)
                . = ALIGN(PAGE_SIZE);
                *(BSS_MAIN)
                BSS_DECRYPTED
                . = ALIGN(PAGE_SIZE);
                __bss_stop = .;
        }

        /*
         * The memory occupied from _text to here, __end_of_kernel_reserve, is
         * automatically reserved in setup_arch(). Anything after here must be
         * explicitly reserved using memblock_reserve() or it will be discarded
         * and treated as available memory.
         */
        __end_of_kernel_reserve = .;

        . = ALIGN(PAGE_SIZE);
        .brk : AT(ADDR(.brk) - LOAD_OFFSET) {
                __brk_base = .;
                . += 64 * 1024;         /* 64k alignment slop space */
                *(.brk_reservation)     /* areas brk users have reserved */
                __brk_limit = .;
        }

        . = ALIGN(PAGE_SIZE);           /* keep VO_INIT_SIZE page aligned */
        _end = .;

#ifdef CONFIG_AMD_MEM_ENCRYPT
        /*
         * Early scratch/workarea section: Lives outside of the kernel proper
         * (_text - _end).
         *
         * Resides after _end because even though the .brk section is after
         * __end_of_kernel_reserve, the .brk section is later reserved as a
         * part of the kernel. Since it is located after __end_of_kernel_reserve
         * it will be discarded and become part of the available memory. As
         * such, it can only be used by very early boot code and must not be
         * needed afterwards.
         *
         * Currently used by SME for performing in-place encryption of the
         * kernel during boot. Resides on a 2MB boundary to simplify the
         * pagetable setup used for SME in-place encryption.
         */
        . = ALIGN(HPAGE_SIZE);
        .init.scratch : AT(ADDR(.init.scratch) - LOAD_OFFSET) {
                __init_scratch_begin = .;
                *(.init.scratch)
                . = ALIGN(HPAGE_SIZE);
                __init_scratch_end = .;
        }
#endif

        STABS_DEBUG
        DWARF_DEBUG
        ELF_DETAILS

        DISCARDS

        /*
         * Make sure that the .got.plt is either completely empty or it
         * contains only the lazy dispatch entries.
         */
        .got.plt (INFO) : { *(.got.plt) }
        ASSERT(SIZEOF(.got.plt) == 0 ||
#ifdef CONFIG_X86_64
               SIZEOF(.got.plt) == 0x18,
#else
               SIZEOF(.got.plt) == 0xc,
#endif
               "Unexpected GOT/PLT entries detected!")

        /*
         * Sections that should stay zero sized, which is safer to
         * explicitly check instead of blindly discarding.
         */
        .got : {
                *(.got) *(.igot.*)
        }
        ASSERT(SIZEOF(.got) == 0, "Unexpected GOT entries detected!")

        .plt : {
                *(.plt) *(.plt.*) *(.iplt)
        }
        ASSERT(SIZEOF(.plt) == 0, "Unexpected run-time procedure linkages detected!")

        .rel.dyn : {
                *(.rel.*) *(.rel_*)
        }
        ASSERT(SIZEOF(.rel.dyn) == 0, "Unexpected run-time relocations (.rel) detected!")

        .rela.dyn : {
                *(.rela.*) *(.rela_*)
        }
        ASSERT(SIZEOF(.rela.dyn) == 0, "Unexpected run-time relocations (.rela) detected!")
}

/*
 * The ASSERT() sink to . is intentional, for binutils 2.14 compatibility:
 */
. = ASSERT((_end - LOAD_OFFSET <= KERNEL_IMAGE_SIZE),
           "kernel image bigger than KERNEL_IMAGE_SIZE");

#ifdef CONFIG_X86_64
/*
 * Per-cpu symbols which need to be offset from __per_cpu_load
 * for the boot processor.
 */
#define INIT_PER_CPU(x) init_per_cpu__##x = ABSOLUTE(x) + __per_cpu_load
INIT_PER_CPU(gdt_page);
INIT_PER_CPU(fixed_percpu_data);
INIT_PER_CPU(irq_stack_backing_store);

#ifdef CONFIG_SMP
. = ASSERT((fixed_percpu_data == 0),
           "fixed_percpu_data is not at start of per-cpu area");
#endif

#endif /* CONFIG_X86_64 */

#ifdef CONFIG_KEXEC_CORE
#include <asm/kexec.h>

. = ASSERT(kexec_control_code_size <= KEXEC_CONTROL_CODE_MAX_SIZE,
           "kexec control code size is too big");
#endif