src/arch/x86/scripts/pcbios.lds - ipxe - Git at Google

 /* -*- ld-script -*- */

 /*
  * Linker script for i386 images
  *
  */

 SECTIONS {

     /* Each section starts at a virtual address of zero.
      *
      * We guarantee alignment of virtual addresses to any alignment
      * specified by the constituent object files (e.g. via
      * __attribute__((aligned(x)))).  Load addresses are guaranteed
      * only up to _max_align.  Provided that all loader and relocation
      * code honours _max_align, this means that physical addresses are
      * also guaranteed up to _max_align.
      *
      * Note that when using -DKEEP_IT_REAL, the UNDI segments are only
      * guaranteed to be loaded on a paragraph boundary (i.e. 16-byte
      * alignment).  Using _max_align>16 will therefore not guarantee
      * >16-byte alignment of physical addresses when -DKEEP_IT_REAL is
      * used (though virtual addresses will still be fully aligned).
      *
      */

     PROVIDE ( _max_align = 16 );

     /*
      * Values used in page table calculations
      *
      * On older versions of ld (without the SANE_EXPR feature),
      * numeric literals within a section description tend to be
      * interpreted as section-relative symbols.
      *
      */
     _page_size = 4096;
     _page_size_1 = ( _page_size - 1 );
     _pte_size = 8;
     _pte_count = ( _page_size / _pte_size );
     _pte_count_1 = ( _pte_count - 1 );

     /*
      * Allow decompressor to require a minimum amount of temporary stack
      * space.
      *
      */
     PROVIDE ( _min_decompress_stack = 0 );

     /*
      * The prefix
      *
      */

     .prefix 0x0 : AT ( _prefix_lma ) {
 	_prefix = .;
 	*(.prefix)
 	*(SORT(.pci_devlist.*))
 	*(.prefix.*)
 	_mprefix = .;
     } .bss.prefix (NOLOAD) : AT ( _bss_prefix_lma ) {
 	_eprefix = .;
     }
     _prefix_filesz	= ABSOLUTE ( _mprefix ) - ABSOLUTE ( _prefix );
     _prefix_memsz	= ABSOLUTE ( _eprefix ) - ABSOLUTE ( _prefix );
     _prefix_padsz	= ABSOLUTE ( _eprefix ) - ABSOLUTE ( _mprefix );

     /*
      * The 16-bit (real-mode) code section
      *
      */

     .text16.early 0x0 : AT ( _text16_early_lma ) {
 	_text16 = .;
 	KEEP(*(.text16.null))
 	KEEP(*(.text16.null.*))
 	. += 1;				/* Prevent NULL being valid */
 	*(.text16.early)
 	*(.text16.early.*)
 	_etext16_early = .;
     } .text16.late ALIGN ( _max_align ) : AT ( _text16_late_lma ) {
 	_text16_late = .;
 	*(.text16)
 	*(.text16.*)
 	_mtext16 = .;
     } .bss.text16 (NOLOAD) : AT ( _bss_text16_lma ) {
 	_etext16 = .;
     }
     _text16_early_filesz = ABSOLUTE ( _etext16_early ) - ABSOLUTE ( _text16 );
     _text16_early_memsz	= ABSOLUTE ( _etext16_early ) - ABSOLUTE ( _text16 );
     _text16_late_filesz	= ABSOLUTE ( _mtext16 ) - ABSOLUTE ( _text16_late );
     _text16_late_memsz	= ABSOLUTE ( _etext16 ) - ABSOLUTE ( _text16_late );
     _text16_memsz	= ABSOLUTE ( _etext16 ) - ABSOLUTE ( _text16 );
     _text16_padsz	= ABSOLUTE ( _etext16 ) - ABSOLUTE ( _mtext16 );

     /*
      * The 16-bit (real-mode) data section
      *
      */

     .data16 0x0 : AT ( _data16_lma ) {
 	_data16 = .;
 	. += 1;				/* Prevent NULL being valid */
 	*(.rodata16)
 	*(.rodata16.*)
 	*(.data16)
 	*(.data16.*)
 	_mdata16 = .;
     } .bss.data16 (NOLOAD) : AT ( _bss_data16_lma ) {
 	*(.bss16)
 	*(.bss16.*)
 	*(.stack16)
 	*(.stack16.*)
 	. = MAX ( ., _mdata16 + _min_decompress_stack );
 	_edata16 = .;
     }
     _data16_filesz	= ABSOLUTE ( _mdata16 ) - ABSOLUTE ( _data16 );
     _data16_memsz	= ABSOLUTE ( _edata16 ) - ABSOLUTE ( _data16 );
     _data16_padsz	= ABSOLUTE ( _edata16 ) - ABSOLUTE ( _mdata16 );

     /*
      * The 32-bit sections
      *
      */

     .textdata 0x0 : AT ( _textdata_lma ) {
 	_textdata = .;
 	KEEP(*(.text.null_trap))
 	KEEP(*(.text.null_trap.*))
 	. += 1;				/* Prevent NULL being valid */
 	*(.text)
 	*(.text.*)
 	*(.rodata)
 	*(.rodata.*)
 	*(.data)
 	*(.data.*)
 	KEEP(*(SORT(.tbl.*)))	/* Various tables.  See include/tables.h */
 	KEEP(*(.provided))
 	KEEP(*(.provided.*))
 	_mtextdata = .;
     } .bss.textdata (NOLOAD) : AT ( _bss_textdata_lma ) {
 	*(.bss)
 	*(.bss.*)
 	*(COMMON)
 	*(.stack)
 	*(.stack.*)
 	_pages = .;
 	*(.pages)
 	*(.pages.*)
 	_use_page_tables = ABSOLUTE ( . ) - ABSOLUTE ( _pages );
 	_textdata_paged_len =
 	    ABSOLUTE ( ABSOLUTE ( . ) - ABSOLUTE ( _textdata ) );
 	_textdata_ptes =
 	    ABSOLUTE ( ( _textdata_paged_len + _page_size_1 ) / _page_size );
 	_textdata_pdes =
 	    ABSOLUTE ( ( _textdata_ptes + _pte_count_1 ) / _pte_count );
 	. += ( _use_page_tables ? ( _textdata_pdes * _page_size ) : 0 );
 	_epages = .;
 	_etextdata = .;
     }
     _textdata_filesz	= ABSOLUTE ( _mtextdata ) - ABSOLUTE ( _textdata );
     _textdata_memsz	= ABSOLUTE ( _etextdata ) - ABSOLUTE ( _textdata );
     _textdata_padsz	= ABSOLUTE ( _etextdata ) - ABSOLUTE ( _mtextdata );

     /*
      * Payload prefix
      *
      * If present, this will be placed between .text16.early and .text16.late.
      *
      */
     .pprefix 0x0 : AT ( _pprefix_lma ) {
 	_pprefix = .;
 	KEEP(*(.pprefix))
 	KEEP(*(.pprefix.*))
 	_mpprefix = .;
     } .bss.pprefix (NOLOAD) : AT ( _bss_pprefix_lma ) {
 	_epprefix = .;
     }
     _pprefix_filesz	= ABSOLUTE ( _mpprefix ) - ABSOLUTE ( _pprefix );
     _pprefix_memsz	= ABSOLUTE ( _epprefix ) - ABSOLUTE ( _pprefix );
     _pprefix_padsz	= ABSOLUTE ( _epprefix ) - ABSOLUTE ( _mpprefix );

     /*
      * Compressor information block
      *
      */

     .zinfo 0x0 : AT ( _zinfo_lma ) {
 	_zinfo = .;
 	KEEP(*(.zinfo))
 	KEEP(*(.zinfo.*))
 	_mzinfo = .;
     } .bss.zinfo (NOLOAD) : AT ( _bss_zinfo_lma ) {
 	_ezinfo = .;
     }
     _zinfo_filesz	= ABSOLUTE ( _mzinfo ) - ABSOLUTE ( _zinfo );
     _zinfo_memsz	= ABSOLUTE ( _ezinfo ) - ABSOLUTE ( _zinfo );
     _zinfo_padsz	= ABSOLUTE ( _ezinfo ) - ABSOLUTE ( _mzinfo );

     /*
      * Weak symbols that need zero values if not otherwise defined
      *
      */

     .weak 0x0 : AT ( _end_lma ) {
 	_weak = .;
 	*(.weak)
 	*(.weak.*)
 	_eweak = .;
     }
     _assert = ASSERT ( ( _weak == _eweak ), ".weak is non-zero length" );

     /*
      * Dispose of the comment and note sections to make the link map
      * easier to read
      *
      */

     /DISCARD/ : {
 	*(.comment)
 	*(.comment.*)
 	*(.note)
 	*(.note.*)
 	*(.eh_frame)
 	*(.eh_frame.*)
 	*(.rel)
 	*(.rel.*)
 	*(.einfo)
 	*(.einfo.*)
 	*(.discard)
 	*(.discard.*)
     }

     /*
      * Load address calculations.  In older versions of ld, ALIGN()
      * can operate only on the location counter, so we use that.
      *
      */

     .			= 0;

     .			= ALIGN ( _max_align );
     _prefix_lma		= .;
     .			+= ABSOLUTE ( _prefix_filesz );

     .			= ALIGN ( _max_align );
     _text16_early_lma	= .;
     .			+= ABSOLUTE ( _text16_early_filesz );

     .			= ALIGN ( _max_align );
     .			= ALIGN ( _payload_align );
     _pprefix_lma	= .;
     .			+= ABSOLUTE ( _pprefix_filesz );

     .			= ALIGN ( _max_align );
     _payload_lma	= .;
     _pprefix_skip	= ABSOLUTE ( _payload_lma ) - ABSOLUTE ( _pprefix_lma );
     _text16_late_lma	= .;
     .			+= ABSOLUTE ( _text16_late_filesz );

     .			= ALIGN ( _max_align );
     _data16_lma		= .;
     .			+= ABSOLUTE ( _data16_filesz );

     .			= ALIGN ( _max_align );
     _textdata_lma	= .;
     .			+= ABSOLUTE ( _textdata_filesz );

     _filesz		= .; /* Do not include .bss.* or .zinfo in file size */

     /*
      * Dummy load addresses for .bss.* and .zinfo sections
      *
      */

     .			= ALIGN ( _max_align );
     _bss_prefix_lma	= .;
     .			+= ABSOLUTE ( _prefix_padsz );

     .			= ALIGN ( _max_align );
     _bss_text16_lma	= .;
     .			+= ABSOLUTE ( _text16_padsz );

     .			= ALIGN ( _max_align );
     _bss_data16_lma	= .;
     .			+= ABSOLUTE ( _data16_padsz );

     .			= ALIGN ( _max_align );
     _bss_textdata_lma	= .;
     .			+= ABSOLUTE ( _textdata_padsz );

     .			= ALIGN ( _max_align );
     _bss_pprefix_lma	= .;
     .			+= ABSOLUTE ( _pprefix_padsz );

     .			= ALIGN ( _max_align );
     _bss_zinfo_lma	= .;
     .			+= ABSOLUTE ( _zinfo_padsz );

     .			= ALIGN ( _max_align );
     _zinfo_lma		= .;
     .			+= ABSOLUTE ( _zinfo_filesz );

     .			= ALIGN ( _max_align );
     _end_lma		= .;

     /*
      * Values calculated to save code from doing it
      *
      */
     _text16_memsz_ppgh	= ( ( ( _text16_memsz + 63 ) / 64 ) * 4 );
     _data16_memsz_ppgh	= ( ( ( _data16_memsz + 63 ) / 64 ) * 4 );
     _textdata_memsz_pgh	= ( ( _textdata_memsz + 15 ) / 16 );
     _textdata_memsz_kb	= ( ( _textdata_memsz + 1023 ) / 1024 );
 }
	/* -- ld-script -- */

	/*
	* Linker script for i386 images
	*
	*/

	SECTIONS {

	/* Each section starts at a virtual address of zero.
	*
	* We guarantee alignment of virtual addresses to any alignment
	* specified by the constituent object files (e.g. via
	* __attribute__((aligned(x)))). Load addresses are guaranteed
	* only up to _max_align. Provided that all loader and relocation
	* code honours _max_align, this means that physical addresses are
	* also guaranteed up to _max_align.
	*
	* Note that when using -DKEEP_IT_REAL, the UNDI segments are only
	* guaranteed to be loaded on a paragraph boundary (i.e. 16-byte
	* alignment). Using _max_align>16 will therefore not guarantee
	* >16-byte alignment of physical addresses when -DKEEP_IT_REAL is
	* used (though virtual addresses will still be fully aligned).
	*
	*/

	PROVIDE ( _max_align = 16 );

	/*
	* Values used in page table calculations
	*
	* On older versions of ld (without the SANE_EXPR feature),
	* numeric literals within a section description tend to be
	* interpreted as section-relative symbols.
	*
	*/
	_page_size = 4096;
	_page_size_1 = ( _page_size - 1 );
	_pte_size = 8;
	_pte_count = ( _page_size / _pte_size );
	_pte_count_1 = ( _pte_count - 1 );

	/*
	* Allow decompressor to require a minimum amount of temporary stack
	* space.
	*
	*/
	PROVIDE ( _min_decompress_stack = 0 );

	/*
	* The prefix
	*
	*/

	.prefix 0x0 : AT ( _prefix_lma ) {
	_prefix = .;
	*(.prefix)
	(SORT(.pci_devlist.))
	(.prefix.)
	_mprefix = .;
	} .bss.prefix (NOLOAD) : AT ( _bss_prefix_lma ) {
	_eprefix = .;
	}
	_prefix_filesz = ABSOLUTE ( _mprefix ) - ABSOLUTE ( _prefix );
	_prefix_memsz = ABSOLUTE ( _eprefix ) - ABSOLUTE ( _prefix );
	_prefix_padsz = ABSOLUTE ( _eprefix ) - ABSOLUTE ( _mprefix );

	/*
	* The 16-bit (real-mode) code section
	*
	*/

	.text16.early 0x0 : AT ( _text16_early_lma ) {
	_text16 = .;
	KEEP(*(.text16.null))
	KEEP((.text16.null.))
	. += 1; /* Prevent NULL being valid */
	*(.text16.early)
	(.text16.early.)
	_etext16_early = .;
	} .text16.late ALIGN ( _max_align ) : AT ( _text16_late_lma ) {
	_text16_late = .;
	*(.text16)
	(.text16.)
	_mtext16 = .;
	} .bss.text16 (NOLOAD) : AT ( _bss_text16_lma ) {
	_etext16 = .;
	}
	_text16_early_filesz = ABSOLUTE ( _etext16_early ) - ABSOLUTE ( _text16 );
	_text16_early_memsz = ABSOLUTE ( _etext16_early ) - ABSOLUTE ( _text16 );
	_text16_late_filesz = ABSOLUTE ( _mtext16 ) - ABSOLUTE ( _text16_late );
	_text16_late_memsz = ABSOLUTE ( _etext16 ) - ABSOLUTE ( _text16_late );
	_text16_memsz = ABSOLUTE ( _etext16 ) - ABSOLUTE ( _text16 );
	_text16_padsz = ABSOLUTE ( _etext16 ) - ABSOLUTE ( _mtext16 );

	/*
	* The 16-bit (real-mode) data section
	*
	*/

	.data16 0x0 : AT ( _data16_lma ) {
	_data16 = .;
	. += 1; /* Prevent NULL being valid */
	*(.rodata16)
	(.rodata16.)
	*(.data16)
	(.data16.)
	_mdata16 = .;
	} .bss.data16 (NOLOAD) : AT ( _bss_data16_lma ) {
	*(.bss16)
	(.bss16.)
	*(.stack16)
	(.stack16.)
	. = MAX ( ., _mdata16 + _min_decompress_stack );
	_edata16 = .;
	}
	_data16_filesz = ABSOLUTE ( _mdata16 ) - ABSOLUTE ( _data16 );
	_data16_memsz = ABSOLUTE ( _edata16 ) - ABSOLUTE ( _data16 );
	_data16_padsz = ABSOLUTE ( _edata16 ) - ABSOLUTE ( _mdata16 );

	/*
	* The 32-bit sections
	*
	*/

	.textdata 0x0 : AT ( _textdata_lma ) {
	_textdata = .;
	KEEP(*(.text.null_trap))
	KEEP((.text.null_trap.))
	. += 1; /* Prevent NULL being valid */
	*(.text)
	(.text.)
	*(.rodata)
	(.rodata.)
	*(.data)
	(.data.)
	KEEP((SORT(.tbl.))) /* Various tables. See include/tables.h */
	KEEP(*(.provided))
	KEEP((.provided.))
	_mtextdata = .;
	} .bss.textdata (NOLOAD) : AT ( _bss_textdata_lma ) {
	*(.bss)
	(.bss.)
	*(COMMON)
	*(.stack)
	(.stack.)
	_pages = .;
	*(.pages)
	(.pages.)
	_use_page_tables = ABSOLUTE ( . ) - ABSOLUTE ( _pages );
	_textdata_paged_len =
	ABSOLUTE ( ABSOLUTE ( . ) - ABSOLUTE ( _textdata ) );
	_textdata_ptes =
	ABSOLUTE ( ( _textdata_paged_len + _page_size_1 ) / _page_size );
	_textdata_pdes =
	ABSOLUTE ( ( _textdata_ptes + _pte_count_1 ) / _pte_count );
	. += ( _use_page_tables ? ( _textdata_pdes * _page_size ) : 0 );
	_epages = .;
	_etextdata = .;
	}
	_textdata_filesz = ABSOLUTE ( _mtextdata ) - ABSOLUTE ( _textdata );
	_textdata_memsz = ABSOLUTE ( _etextdata ) - ABSOLUTE ( _textdata );
	_textdata_padsz = ABSOLUTE ( _etextdata ) - ABSOLUTE ( _mtextdata );

	/*
	* Payload prefix
	*
	* If present, this will be placed between .text16.early and .text16.late.
	*
	*/
	.pprefix 0x0 : AT ( _pprefix_lma ) {
	_pprefix = .;
	KEEP(*(.pprefix))
	KEEP((.pprefix.))
	_mpprefix = .;
	} .bss.pprefix (NOLOAD) : AT ( _bss_pprefix_lma ) {
	_epprefix = .;
	}
	_pprefix_filesz = ABSOLUTE ( _mpprefix ) - ABSOLUTE ( _pprefix );
	_pprefix_memsz = ABSOLUTE ( _epprefix ) - ABSOLUTE ( _pprefix );
	_pprefix_padsz = ABSOLUTE ( _epprefix ) - ABSOLUTE ( _mpprefix );

	/*
	* Compressor information block
	*
	*/

	.zinfo 0x0 : AT ( _zinfo_lma ) {
	_zinfo = .;
	KEEP(*(.zinfo))
	KEEP((.zinfo.))
	_mzinfo = .;
	} .bss.zinfo (NOLOAD) : AT ( _bss_zinfo_lma ) {
	_ezinfo = .;
	}
	_zinfo_filesz = ABSOLUTE ( _mzinfo ) - ABSOLUTE ( _zinfo );
	_zinfo_memsz = ABSOLUTE ( _ezinfo ) - ABSOLUTE ( _zinfo );
	_zinfo_padsz = ABSOLUTE ( _ezinfo ) - ABSOLUTE ( _mzinfo );

	/*
	* Weak symbols that need zero values if not otherwise defined
	*
	*/

	.weak 0x0 : AT ( _end_lma ) {
	_weak = .;
	*(.weak)
	(.weak.)
	_eweak = .;
	}
	_assert = ASSERT ( ( _weak == _eweak ), ".weak is non-zero length" );

	/*
	* Dispose of the comment and note sections to make the link map
	* easier to read
	*
	*/

	/DISCARD/ : {
	*(.comment)
	(.comment.)
	*(.note)
	(.note.)
	*(.eh_frame)
	(.eh_frame.)
	*(.rel)
	(.rel.)
	*(.einfo)
	(.einfo.)
	*(.discard)
	(.discard.)
	}

	/*
	* Load address calculations. In older versions of ld, ALIGN()
	* can operate only on the location counter, so we use that.
	*
	*/

	. = 0;

	. = ALIGN ( _max_align );
	_prefix_lma = .;
	. += ABSOLUTE ( _prefix_filesz );

	. = ALIGN ( _max_align );
	_text16_early_lma = .;
	. += ABSOLUTE ( _text16_early_filesz );

	. = ALIGN ( _max_align );
	. = ALIGN ( _payload_align );
	_pprefix_lma = .;
	. += ABSOLUTE ( _pprefix_filesz );

	. = ALIGN ( _max_align );
	_payload_lma = .;
	_pprefix_skip = ABSOLUTE ( _payload_lma ) - ABSOLUTE ( _pprefix_lma );
	_text16_late_lma = .;
	. += ABSOLUTE ( _text16_late_filesz );

	. = ALIGN ( _max_align );
	_data16_lma = .;
	. += ABSOLUTE ( _data16_filesz );

	. = ALIGN ( _max_align );
	_textdata_lma = .;
	. += ABSOLUTE ( _textdata_filesz );

	_filesz = .; /* Do not include .bss.* or .zinfo in file size */

	/*
	* Dummy load addresses for .bss.* and .zinfo sections
	*
	*/

	. = ALIGN ( _max_align );
	_bss_prefix_lma = .;
	. += ABSOLUTE ( _prefix_padsz );

	. = ALIGN ( _max_align );
	_bss_text16_lma = .;
	. += ABSOLUTE ( _text16_padsz );

	. = ALIGN ( _max_align );
	_bss_data16_lma = .;
	. += ABSOLUTE ( _data16_padsz );

	. = ALIGN ( _max_align );
	_bss_textdata_lma = .;
	. += ABSOLUTE ( _textdata_padsz );

	. = ALIGN ( _max_align );
	_bss_pprefix_lma = .;
	. += ABSOLUTE ( _pprefix_padsz );

	. = ALIGN ( _max_align );
	_bss_zinfo_lma = .;
	. += ABSOLUTE ( _zinfo_padsz );

	. = ALIGN ( _max_align );
	_zinfo_lma = .;
	. += ABSOLUTE ( _zinfo_filesz );

	. = ALIGN ( _max_align );
	_end_lma = .;

	/*
	* Values calculated to save code from doing it
	*
	*/
	_text16_memsz_ppgh = ( ( ( _text16_memsz + 63 ) / 64 ) * 4 );
	_data16_memsz_ppgh = ( ( ( _data16_memsz + 63 ) / 64 ) * 4 );
	_textdata_memsz_pgh = ( ( _textdata_memsz + 15 ) / 16 );
	_textdata_memsz_kb = ( ( _textdata_memsz + 1023 ) / 1024 );
	}