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![Dimitry Andric](/assets/img/avatar_default.png)
LLD 10.0.0 changed the behavior of the -Ttext option, so that using -Ttext=0x0 now causes linking of the loaders to fail with: ld: error: output file too large: 18446744073707016908 bytes I reported this in https://bugs.llvm.org/show_bug.cgi?id=44715, and initially reverted the upstream change in r357259 to work around it. However, after some discussion with Fangrui Song in the upstream ticket, I think we can classify this as an unfortunate interaction between using -Ttext=0 in combination with --no-rosegment. (We added the latter in r332090, because btxld does not correctly handle input with more than 2 PT_LOAD segments.) Fangrui suggested to use a linker script instead, and Warner was already attempting this in r305353, but had to revert it due to "crypto-using boot problems" (not sure what those were :). This review updates the stand/i386/boot.ldscript to handle more sections, inserts some symbols like _edata and such that we use in libsa, and also discards any .interp section. It uses ORG which is defined on the linker command line using --defsym ORG=value to set the start of all the sections. Reviewed by: imp MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D23952
18 lines
498 B
Plaintext
18 lines
498 B
Plaintext
/* $FreeBSD$ */
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/* Simplified linker script for the boot loaders. */
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OUTPUT_FORMAT("elf32-i386-freebsd")
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OUTPUT_ARCH(i386)
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ENTRY(_start)
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SECTIONS {
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. = ORG;
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.text : { *(.text .text.*) } =0xcccccccc /* Pad with int3, if needed */
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.rodata : { *(.rodata .rodata.*) }
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.got : { *(.got) *(.igot) }
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.got.plt : { *(.got.plt) *(.igot.plt) }
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.data : { *(.data .data.*) }
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_edata = .; PROVIDE (edata = .);
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.bss : { *(.bss .bss.*) }
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_end = .; PROVIDE (end = .);
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/DISCARD/ : { *(.interp) }
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}
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