These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / arch / x86 / entry / vdso / vdso-layout.lds.S

diff --git a/kernel/arch/x86/entry/vdso/vdso-layout.lds.S b/kernel/arch/x86/entry/vdso/vdso-layout.lds.S
new file mode 100644 (file)
index 0000000..de2c921
--- /dev/null
+++ b/kernel/arch/x86/entry/vdso/vdso-layout.lds.S
@@ -0,0 +1,118 @@
+#include <asm/vdso.h>
+
+/*
+ * Linker script for vDSO.  This is an ELF shared object prelinked to
+ * its virtual address, and with only one read-only segment.
+ * This script controls its layout.
+ */
+
+#if defined(BUILD_VDSO64)
+# define SHDR_SIZE 64
+#elif defined(BUILD_VDSO32) || defined(BUILD_VDSOX32)
+# define SHDR_SIZE 40
+#else
+# error unknown VDSO target
+#endif
+
+#define NUM_FAKE_SHDRS 13
+
+SECTIONS
+{
+       /*
+        * User/kernel shared data is before the vDSO.  This may be a little
+        * uglier than putting it after the vDSO, but it avoids issues with
+        * non-allocatable things that dangle past the end of the PT_LOAD
+        * segment.
+        */
+
+       vvar_start = . - 2 * PAGE_SIZE;
+       vvar_page = vvar_start;
+
+       /* Place all vvars at the offsets in asm/vvar.h. */
+#define EMIT_VVAR(name, offset) vvar_ ## name = vvar_page + offset;
+#define __VVAR_KERNEL_LDS
+#include <asm/vvar.h>
+#undef __VVAR_KERNEL_LDS
+#undef EMIT_VVAR
+
+       hpet_page = vvar_start + PAGE_SIZE;
+
+       . = SIZEOF_HEADERS;
+
+       .hash           : { *(.hash) }                  :text
+       .gnu.hash       : { *(.gnu.hash) }
+       .dynsym         : { *(.dynsym) }
+       .dynstr         : { *(.dynstr) }
+       .gnu.version    : { *(.gnu.version) }
+       .gnu.version_d  : { *(.gnu.version_d) }
+       .gnu.version_r  : { *(.gnu.version_r) }
+
+       .dynamic        : { *(.dynamic) }               :text   :dynamic
+
+       .rodata         : {
+               *(.rodata*)
+               *(.data*)
+               *(.sdata*)
+               *(.got.plt) *(.got)
+               *(.gnu.linkonce.d.*)
+               *(.bss*)
+               *(.dynbss*)
+               *(.gnu.linkonce.b.*)
+
+               /*
+                * Ideally this would live in a C file, but that won't
+                * work cleanly for x32 until we start building the x32
+                * C code using an x32 toolchain.
+                */
+               VDSO_FAKE_SECTION_TABLE_START = .;
+               . = . + NUM_FAKE_SHDRS * SHDR_SIZE;
+               VDSO_FAKE_SECTION_TABLE_END = .;
+       }                                               :text
+
+       .fake_shstrtab  : { *(.fake_shstrtab) }         :text
+
+
+       .note           : { *(.note.*) }                :text   :note
+
+       .eh_frame_hdr   : { *(.eh_frame_hdr) }          :text   :eh_frame_hdr
+       .eh_frame       : { KEEP (*(.eh_frame)) }       :text
+
+
+       /*
+        * Text is well-separated from actual data: there's plenty of
+        * stuff that isn't used at runtime in between.
+        */
+
+       .text           : { *(.text*) }                 :text   =0x90909090,
+
+       /*
+        * At the end so that eu-elflint stays happy when vdso2c strips
+        * these.  A better implementation would avoid allocating space
+        * for these.
+        */
+       .altinstructions        : { *(.altinstructions) }       :text
+       .altinstr_replacement   : { *(.altinstr_replacement) }  :text
+
+       /DISCARD/ : {
+               *(.discard)
+               *(.discard.*)
+               *(__bug_table)
+       }
+}
+
+/*
+ * Very old versions of ld do not recognize this name token; use the constant.
+ */
+#define PT_GNU_EH_FRAME        0x6474e550
+
+/*
+ * We must supply the ELF program headers explicitly to get just one
+ * PT_LOAD segment, and set the flags explicitly to make segments read-only.
+ */
+PHDRS
+{
+       text            PT_LOAD         FLAGS(5) FILEHDR PHDRS; /* PF_R|PF_X */
+       dynamic         PT_DYNAMIC      FLAGS(4);               /* PF_R */
+       note            PT_NOTE         FLAGS(4);               /* PF_R */
+       eh_frame_hdr    PT_GNU_EH_FRAME;
+}