9d99bb0a0a
MAXPAGESIZE is not well defined by the GNU ld documentation. Different linkers, and different versions of the same linker, use different MAXPAGESIZE values. Current versions of GNU gold and LLVM's lld use 4K. When set to 4K the kernel panics at boot due to an issue with x86bios. Here we want the kernel physaddr to be the amd64 superpage size, so use that value (2MB) explicitly. With this change GNU gold and LLVM lld can link a working amd64 kernel. PR: 214718 (x86bios) Differential Revision: https://reviews.freebsd.org/D8610
226 lines
8.5 KiB
Plaintext
226 lines
8.5 KiB
Plaintext
/* $FreeBSD$ */
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OUTPUT_FORMAT("elf64-x86-64-freebsd", "elf64-x86-64-freebsd", "elf64-x86-64-freebsd")
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OUTPUT_ARCH(i386:x86-64)
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ENTRY(btext)
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SEARCH_DIR("/usr/lib");
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SECTIONS
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{
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/* Read-only sections, merged into text segment: */
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kernphys = 0x200000;
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/*
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* Use the AT keyword in order to set the right LMA that contains
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* the physical address where the section should be loaded. This is
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* needed for the Xen loader which honours the LMA.
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*/
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.text :
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{
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*(.text .stub .text.* .gnu.linkonce.t.*)
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KEEP (*(.text.*personality*))
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*(.gnu.warning)
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{
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KEEP (*(.fini))
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/* Adjust the address for the data segment. We want to adjust up to
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the same address within the page on the next page up. */
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. = ALIGN (CONSTANT (MAXPAGESIZE)) - ((CONSTANT (MAXPAGESIZE) - .) & (CONSTANT (MAXPAGESIZE) - 1)); . = DATA_SEGMENT_ALIGN (CONSTANT (MAXPAGESIZE), CONSTANT (COMMONPAGESIZE));
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/* Exception handling */
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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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}
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.init_array :
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{
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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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}
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{
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/* gcc uses crtbegin.o to find the start of
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the constructors, so we make sure it is
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first. Because this is a wildcard, it
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doesn't matter if the user does not
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actually link against crtbegin.o; the
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linker won't look for a file to match a
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wildcard. The wildcard also means that it
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doesn't matter which directory crtbegin.o
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is in. */
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KEEP (*crtbegin.o(.ctors))
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KEEP (*crtbegin?.o(.ctors))
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/* We don't want to include the .ctor section from
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the crtend.o file until after the sorted ctors.
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The .ctor section from the crtend file contains the
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end of ctors marker and it must be last */
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KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o ) .ctors))
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KEEP (*(SORT(.ctors.*)))
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KEEP (*(.ctors))
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}
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PROVIDE (stop_ctors = .);
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{
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KEEP (*crtbegin.o(.dtors))
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KEEP (*crtbegin?.o(.dtors))
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KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o ) .dtors))
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KEEP (*(SORT(.dtors.*)))
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KEEP (*(.dtors))
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. = DATA_SEGMENT_RELRO_END (24, .);
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.data :
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{
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*(.data .data.* .gnu.linkonce.d.*)
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KEEP (*(.gnu.linkonce.d.*personality*))
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}
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_edata = .; PROVIDE (edata = .);
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*(.bss .bss.* .gnu.linkonce.b.*)
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*(COMMON)
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_end. Align after .bss to ensure correct alignment even if the
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.bss section disappears because there are no input sections.
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FIXME: Why do we need it? When there is no .bss section, we don't
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pad the .data section. */
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. = ALIGN(. != 0 ? 64 / 8 : 1);
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}
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*(.dynlbss)
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*(LARGE_COMMON)
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}
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. = ALIGN(64 / 8);
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{
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}
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{
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*(.ldata .ldata.* .gnu.linkonce.l.*)
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. = ALIGN(. != 0 ? 64 / 8 : 1);
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}
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/* Stabs debugging sections. */
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/* DWARF debug sections.
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Symbols in the DWARF debugging sections are relative to the beginning
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of the section so we begin them at 0. */
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/* DWARF 1 */
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/* GNU DWARF 1 extensions */
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/DISCARD/ : { *(.note.GNU-stack) }
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}
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