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freebsd-skq/sys/conf/ldscript.amd64
Ed Maste 9d99bb0a0a Use explicit 0x200000 instead of MAXPAGESIZE for the amd64 kernel physaddr 
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
2016-11-25 18:57:14 +00:00

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/* $FreeBSD$ */
OUTPUT_FORMAT("elf64-x86-64-freebsd", "elf64-x86-64-freebsd", "elf64-x86-64-freebsd")
OUTPUT_ARCH(i386:x86-64)
ENTRY(btext)
SEARCH_DIR("/usr/lib");
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/* Read-only sections, merged into text segment: */
kernphys = 0x200000;
. = kernbase + kernphys + SIZEOF_HEADERS;
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*/
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the same address within the page on the next page up. */
. = ALIGN (CONSTANT (MAXPAGESIZE)) - ((CONSTANT (MAXPAGESIZE) - .) & (CONSTANT (MAXPAGESIZE) - 1)); . = DATA_SEGMENT_ALIGN (CONSTANT (MAXPAGESIZE), CONSTANT (COMMONPAGESIZE));
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_end. Align after .bss to ensure correct alignment even if the
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FIXME: Why do we need it? When there is no .bss section, we don't
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/* DWARF debug sections.
Symbols in the DWARF debugging sections are relative to the beginning
of the section so we begin them at 0. */
/* DWARF 1 */
.debug 0 : { *(.debug) }
.line 0 : { *(.line) }
/* GNU DWARF 1 extensions */
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/* DWARF 2 */
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.debug_ranges 0 : { *(.debug_ranges) }
.gnu.attributes 0 : { KEEP (*(.gnu.attributes)) }
/DISCARD/ : { *(.note.GNU-stack) }
}
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