freebsd-skq/sys/conf/ldscript.powerpc64
Brandon Bergren 9411e24df3 [PowerPC] kernel ifunc support for powerpc*, fix ppc64 relocation oddities.
This is a general cleanup of the relocatable kernel support on powerpc,
needed to enable kernel ifuncs.

 * Fix some relocatable issues in the kernel linker, and change to using
   a RELOCATABLE_KERNEL #define instead of #ifdef __powerpc__ for parts that
   other platforms can use in the future if they wish to have ET_DYN kernels.

 * Get rid of the DB_STOFFS hack now that the kernel is relocated to the DMAP
   properly across the board on powerpc64.

 * Add powerpc64 and powerpc32 ifunc functionality.

 * Allow AIM64 virtual mode OF kernels to run from the DMAP like other AIM64
   by implementing a virtual mode restart. This fixes the runtime address on
   PowerMac G5.

 * Fix symbol relocation problems on post-relocation kernels by relocating
   the symbol table.

 * Add an undocumented method for supplying kernel symbols on powernv and
   other powerpc machines using linux-style kernel/initrd loading -- If
   you pass the kernel in as the initrd as well, the copy resident in initrd
   will be used as a source for symbols when initializing the debugger.
   This method is subject to removal once we have a better way of doing this.

Approved by:	jhibbits
Relnotes:	yes
Sponsored by:	Tag1 Consulting, Inc.
Differential Revision:	https://reviews.freebsd.org/D23156
2020-05-07 19:32:49 +00:00

180 lines
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/* $FreeBSD$ */
OUTPUT_FORMAT("elf64-powerpc-freebsd", "elf64-powerpc-freebsd",
"elf64-powerpc-freebsd")
OUTPUT_ARCH(powerpc:common64)
ENTRY(__start)
SEARCH_DIR(/usr/lib);
PROVIDE (__stack = 0);
PHDRS
{
kernel PT_LOAD;
dynamic PT_DYNAMIC;
}
SECTIONS
{
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. = kernbase - 0x100;
.kboot : { *(.text.kboot) } :kernel
/* Read-only sections, merged into text segment: */
. = kernbase;
PROVIDE (begin = .);
.text :
{
*(.glink)
*(.text)
*(.stub)
/* .gnu.warning sections are handled specially by elf32.em. */
*(.gnu.warning)
*(.gnu.linkonce.t*)
} =0
_etext = .;
PROVIDE (etext = .);
/* Do not emit PT_INTERP section, which confuses some loaders (kexec-lite) */
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/* Also delete notes */
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The current compiler no longer needs this, but keep it around for 2.7.2 */
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PROVIDE (__CTOR_LIST__ = .);
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PROVIDE (__CTOR_END__ = .);
PROVIDE (__DTOR_LIST__ = .);
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PROVIDE (_FIXUP_START_ = .);
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PROVIDE (_GOT2_END_ = .);
/* We want the small data sections together, so single-instruction offsets
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we can shorten the on-disk segment size. */
.sdata : { *(.sdata) } :kernel
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PROVIDE (edata = .);
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PROVIDE (__sbss_start = .);
*(.sbss)
*(.scommon)
*(.dynsbss)
PROVIDE (__sbss_end = .);
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/* SGI/MIPS DWARF 2 extensions */
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.debug_varnames 0 : { *(.debug_varnames) }
/* These must appear regardless of . */
}