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

vsyscall.lds.S (2169B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/*
      3 * Linker script for vsyscall DSO.  The vsyscall page is an ELF shared
      4 * object prelinked to its virtual address, and with only one read-only
      5 * segment (that fits in one page).  This script controls its layout.
      6 */
      7#include <asm/asm-offsets.h>
      8
      9#ifdef CONFIG_CPU_LITTLE_ENDIAN
     10OUTPUT_FORMAT("elf32-sh-linux", "elf32-sh-linux", "elf32-sh-linux")
     11#else
     12OUTPUT_FORMAT("elf32-shbig-linux", "elf32-shbig-linux", "elf32-shbig-linux")
     13#endif
     14OUTPUT_ARCH(sh)
     15
     16/* The ELF entry point can be used to set the AT_SYSINFO value.  */
     17ENTRY(__kernel_vsyscall);
     18
     19SECTIONS
     20{
     21	. = SIZEOF_HEADERS;
     22
     23	.hash		: { *(.hash) }			:text
     24	.gnu.hash	: { *(.gnu.hash) }
     25	.dynsym		: { *(.dynsym) }
     26	.dynstr		: { *(.dynstr) }
     27	.gnu.version	: { *(.gnu.version) }
     28	.gnu.version_d	: { *(.gnu.version_d) }
     29	.gnu.version_r	: { *(.gnu.version_r) }
     30
     31	/*
     32	 * This linker script is used both with -r and with -shared.
     33	 * For the layouts to match, we need to skip more than enough
     34	 * space for the dynamic symbol table et al.  If this amount
     35	 * is insufficient, ld -shared will barf.  Just increase it here.
     36	 */
     37	. = 0x400;
     38
     39	.text		: { *(.text) } 			:text	=0x90909090
     40	.note		: { *(.note.*) }		:text	:note
     41	.eh_frame_hdr	: { *(.eh_frame_hdr ) }		:text	:eh_frame_hdr
     42	.eh_frame	: {
     43		KEEP (*(.eh_frame))
     44		LONG (0)
     45	}						:text
     46	.dynamic	: { *(.dynamic) }		:text	:dynamic
     47	.useless	: {
     48	      *(.got.plt) *(.got)
     49	      *(.data .data.* .gnu.linkonce.d.*)
     50	      *(.dynbss)
     51	      *(.bss .bss.* .gnu.linkonce.b.*)
     52	}						:text
     53}
     54
     55/*
     56 * Very old versions of ld do not recognize this name token; use the constant.
     57 */
     58#define PT_GNU_EH_FRAME	0x6474e550
     59
     60/*
     61 * We must supply the ELF program headers explicitly to get just one
     62 * PT_LOAD segment, and set the flags explicitly to make segments read-only.
     63 */
     64PHDRS
     65{
     66	text		PT_LOAD FILEHDR PHDRS FLAGS(5);	/* PF_R|PF_X */
     67	dynamic		PT_DYNAMIC FLAGS(4);		/* PF_R */
     68	note		PT_NOTE FLAGS(4);		/* PF_R */
     69	eh_frame_hdr	PT_GNU_EH_FRAME;
     70}
     71
     72/*
     73 * This controls what symbols we export from the DSO.
     74 */
     75VERSION
     76{
     77	LINUX_2.6 {
     78	global:
     79		__kernel_vsyscall;
     80		__kernel_sigreturn;
     81		__kernel_rt_sigreturn;
     82
     83	local: *;
     84	};
     85}