cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

vdso-layout.lds.S (2243B)

      1/*
      2 * Linker script for vDSO.  This is an ELF shared object prelinked to
      3 * its virtual address, and with only one read-only segment.
      4 * This script controls its layout.
      5 */
      6
      7#if defined(BUILD_VDSO64)
      8# define SHDR_SIZE 64
      9#elif defined(BUILD_VDSO32)
     10# define SHDR_SIZE 40
     11#else
     12# error unknown VDSO target
     13#endif
     14
     15#define NUM_FAKE_SHDRS 7
     16
     17SECTIONS
     18{
     19	/*
     20	 * User/kernel shared data is before the vDSO.  This may be a little
     21	 * uglier than putting it after the vDSO, but it avoids issues with
     22	 * non-allocatable things that dangle past the end of the PT_LOAD
     23	 * segment. Page size is 8192 for both 64-bit and 32-bit vdso binaries
     24	 */
     25
     26	vvar_start = . -8192;
     27	vvar_data = vvar_start;
     28
     29	. = SIZEOF_HEADERS;
     30
     31	.hash		: { *(.hash) }			:text
     32	.gnu.hash	: { *(.gnu.hash) }
     33	.dynsym		: { *(.dynsym) }
     34	.dynstr		: { *(.dynstr) }
     35	.gnu.version	: { *(.gnu.version) }
     36	.gnu.version_d	: { *(.gnu.version_d) }
     37	.gnu.version_r	: { *(.gnu.version_r) }
     38
     39	.dynamic	: { *(.dynamic) }		:text	:dynamic
     40
     41	.rodata		: {
     42		*(.rodata*)
     43		*(.data*)
     44		*(.sdata*)
     45		*(.got.plt) *(.got)
     46		*(.gnu.linkonce.d.*)
     47		*(.bss*)
     48		*(.dynbss*)
     49		*(.gnu.linkonce.b.*)
     50
     51		/*
     52		 * Ideally this would live in a C file: kept in here for
     53		 * compatibility with x86-64.
     54		 */
     55		VDSO_FAKE_SECTION_TABLE_START = .;
     56		. = . + NUM_FAKE_SHDRS * SHDR_SIZE;
     57		VDSO_FAKE_SECTION_TABLE_END = .;
     58	}						:text
     59
     60	.fake_shstrtab	: { *(.fake_shstrtab) }		:text
     61
     62
     63	.note		: { *(.note.*) }		:text	:note
     64
     65	.eh_frame_hdr	: { *(.eh_frame_hdr) }		:text	:eh_frame_hdr
     66	.eh_frame	: { KEEP (*(.eh_frame)) }	:text
     67
     68
     69	/*
     70	 * Text is well-separated from actual data: there's plenty of
     71	 * stuff that isn't used at runtime in between.
     72	 */
     73
     74	.text		: { *(.text*) }			:text	=0x90909090,
     75
     76	/DISCARD/ : {
     77		*(.discard)
     78		*(.discard.*)
     79		*(__bug_table)
     80	}
     81}
     82
     83/*
     84 * Very old versions of ld do not recognize this name token; use the constant.
     85 */
     86#define PT_GNU_EH_FRAME	0x6474e550
     87
     88/*
     89 * We must supply the ELF program headers explicitly to get just one
     90 * PT_LOAD segment, and set the flags explicitly to make segments read-only.
     91 */
     92PHDRS
     93{
     94	text		PT_LOAD		FLAGS(5) FILEHDR PHDRS; /* PF_R|PF_X */
     95	dynamic		PT_DYNAMIC	FLAGS(4);		/* PF_R */
     96	note		PT_NOTE		FLAGS(4);		/* PF_R */
     97	eh_frame_hdr	PT_GNU_EH_FRAME;
     98}