fixes to get PLXD working

diff --git a/arch/xen/i386/kernel/vsyscall-note.S b/arch/xen/i386/kernel/vsyscall-note.S
index d4b5be4..f404784 100644 (file)
--- a/arch/xen/i386/kernel/vsyscall-note.S
+++ b/arch/xen/i386/kernel/vsyscall-note.S
@@ -1,25 +1,32 @@
 /*
  * This supplies .note.* sections to go into the PT_NOTE inside the vDSO text.
  * Here we can supply some information useful to userland.
+ * First we get the vanilla i386 note that supplies the kernel version info.
  */
 
-#include <linux/uts.h>
-#include <linux/version.h>
+#include "../../../i386/kernel/vsyscall-note.S"
 
-#define ASM_ELF_NOTE_BEGIN(name, flags, vendor, type)                        \
-       .section name, flags;                                                 \
-       .balign 4;                                                            \
-       .long 1f - 0f;          /* name length */                             \
-       .long 3f - 2f;          /* data length */                             \
-       .long type;             /* note type */                               \
-0:     .asciz vendor;          /* vendor name */                             \
-1:     .balign 4;                                                            \
-2:
-
-#define ASM_ELF_NOTE_END                                                     \
-3:     .balign 4;              /* pad out section */                         \
-       .previous
+/*
+ * Now we add a special note telling glibc's dynamic linker a fake hardware
+ * flavor that it will use to choose the search path for libraries in the
+ * same way it uses real hardware capabilities like "mmx".
+ * We supply "nosegneg" as the fake capability, to indicate that we
+ * do not like negative offsets in instructions using segment overrides,
+ * since we implement those inefficiently.  This makes it possible to
+ * install libraries optimized to avoid those access patterns in someplace
+ * like /lib/i686/tls/nosegneg.  Note that an /etc/ld.so.conf.d/file
+ * corresponding to the bits here is needed to make ldconfig work right.
+ * It should contain:
+ *     hwcap 0 nosegneg
+ * to match the mapping of bit to name that we give here.
+ */
+#define NOTE_KERNELCAP_BEGIN(ncaps, mask) \
+       ASM_ELF_NOTE_BEGIN(".note.kernelcap", "a", "GNU", 2) \
+       .long ncaps, mask
+#define NOTE_KERNELCAP(bit, name) \
+       .byte bit; .asciz name
+#define NOTE_KERNELCAP_END ASM_ELF_NOTE_END
 
-       ASM_ELF_NOTE_BEGIN(".note.kernel-version", "a", UTS_SYSNAME, 0)
-       .long LINUX_VERSION_CODE
-       ASM_ELF_NOTE_END
+NOTE_KERNELCAP_BEGIN(1, 1)
+NOTE_KERNELCAP(0, "nosegneg")
+NOTE_KERNELCAP_END

diff --git a/arch/xen/kernel/vmlinux.lds.S b/arch/xen/kernel/vmlinux.lds.S
new file mode 100644 (file)
index 0000000..ef40882
--- /dev/null
+++ b/arch/xen/kernel/vmlinux.lds.S
@@ -0,0 +1,275 @@
+/* ld script to make i386 Linux kernel
+ * Written by Martin Mares <mj@atrey.karlin.mff.cuni.cz>;
+ */
+
+#define LOAD_OFFSET __PAGE_OFFSET
+
+#include <asm-generic/vmlinux.lds.h>
+#include <asm/thread_info.h>
+#include <asm/page.h>
+       
+
+OUTPUT_FORMAT("elf32-i386", "elf32-i386", "elf32-i386")
+OUTPUT_ARCH(i386)
+#ifdef ALK_KEXEC       
+#define KERN_PHYS_OFFSET (CONFIG_KERN_PHYS_OFFSET * 0x100000)
+ENTRY(phys_startup_32)
+jiffies = jiffies_64;
+SECTIONS
+{
+  . = LOAD_OFFSET + KERN_PHYS_OFFSET;
+  phys_startup_32 = startup_32 - LOAD_OFFSET;
+  /* read-only */
+  _text = .;                   /* Text and read-only data */
+  .text : AT(ADDR(.text) - LOAD_OFFSET) {
+       *(.text)
+       SCHED_TEXT
+       LOCK_TEXT
+       *(.fixup)
+       *(.gnu.warning)
+       } = 0x9090
+
+  _etext = .;                  /* End of text section */
+
+  . = ALIGN(16);               /* Exception table */
+  __start___ex_table = .;
+  __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { *(__ex_table) }
+  __stop___ex_table = .;
+
+  RODATA
+
+  /* writeable */
+  .data : AT(ADDR(.data) - LOAD_OFFSET) {                      /* Data */
+       *(.data)
+       CONSTRUCTORS
+       }
+
+  . = ALIGN(4096);
+  __nosave_begin = .;
+  .data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) { *(.data.nosave) }
+  . = ALIGN(4096);
+  __nosave_end = .;
+
+  . = ALIGN(4096);
+  .data.page_aligned : AT(ADDR(.data.page_aligned) - LOAD_OFFSET) { *(.data.idt) }
+
+  . = ALIGN(32);
+  .data.cacheline_aligned : AT(ADDR(.data.cacheline_aligned) - LOAD_OFFSET) {
+       *(.data.cacheline_aligned)
+  }
+
+  _edata = .;                  /* End of data section */
+
+  . = ALIGN(THREAD_SIZE);      /* init_task */
+  .data.init_task : AT(ADDR(.data.init_task) - LOAD_OFFSET) { *(.data.init_task) }
+
+  /* will be freed after init */
+  . = ALIGN(4096);             /* Init code and data */
+  __init_begin = .;
+  .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {
+       _sinittext = .;
+       *(.init.text)
+       _einittext = .;
+  }
+  .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { *(.init.data) }
+  . = ALIGN(16);
+  __setup_start = .;
+  .init.setup : AT(ADDR(.init.setup) - LOAD_OFFSET) { *(.init.setup) }
+  __setup_end = .;
+  __initcall_start = .;
+  .initcall.init : AT(ADDR(.initcall.init) - LOAD_OFFSET) {
+       *(.initcall1.init) 
+       *(.initcall2.init) 
+       *(.initcall3.init) 
+       *(.initcall4.init) 
+       *(.initcall5.init) 
+       *(.initcall6.init) 
+       *(.initcall7.init)
+  }
+  __initcall_end = .;
+  __con_initcall_start = .;
+  .con_initcall.init : AT(ADDR(.con_initcall.init) - LOAD_OFFSET) {
+       *(.con_initcall.init)
+  }
+  __con_initcall_end = .;
+  SECURITY_INIT
+  . = ALIGN(4);
+  __alt_instructions = .;
+  .altinstructions : AT(ADDR(.altinstructions) - LOAD_OFFSET) {
+       *(.altinstructions)
+  }
+  __alt_instructions_end = .;
+ .altinstr_replacement : AT(ADDR(.altinstr_replacement) - LOAD_OFFSET) {
+       *(.altinstr_replacement)
+ }
+  /* .exit.text is discard at runtime, not link time, to deal with references
+     from .altinstructions and .eh_frame */
+  .exit.text : AT(ADDR(.exit.text) - LOAD_OFFSET) { *(.exit.text) }
+  .exit.data : AT(ADDR(.exit.data) - LOAD_OFFSET) { *(.exit.data) }
+  . = ALIGN(4096);
+  __initramfs_start = .;
+  .init.ramfs : AT(ADDR(.init.ramfs) - LOAD_OFFSET) { *(.init.ramfs) }
+  __initramfs_end = .;
+  . = ALIGN(32);
+  __per_cpu_start = .;
+  .data.percpu  : AT(ADDR(.data.percpu) - LOAD_OFFSET) { *(.data.percpu) }
+  __per_cpu_end = .;
+  . = ALIGN(4096);
+  __init_end = .;
+  /* freed after init ends here */
+       
+  __bss_start = .;             /* BSS */
+  .bss.page_aligned  : AT(ADDR(.bss.page_aligned) - LOAD_OFFSET) {
+       *(.bss.page_aligned) }
+  .bss : AT(ADDR(.bss) - LOAD_OFFSET) {
+       *(.bss)
+  }
+  . = ALIGN(4);
+  __bss_stop = .; 
+
+  _end = . ;
+
+  /* This is where the kernel creates the early boot page tables */
+  . = ALIGN(4096);
+  pg0 = .;
+
+  /* Sections to be discarded */
+  /DISCARD/ : {
+       *(.exitcall.exit)
+       }
+
+  /* Stabs debugging sections.  */
+  .stab 0 : { *(.stab) }
+  .stabstr 0 : { *(.stabstr) }
+  .stab.excl 0 : { *(.stab.excl) }
+  .stab.exclstr 0 : { *(.stab.exclstr) }
+  .stab.index 0 : { *(.stab.index) }
+  .stab.indexstr 0 : { *(.stab.indexstr) }
+  .comment 0 : { *(.comment) }
+}
+#else
+ENTRY(startup_32)
+jiffies = jiffies_64;
+SECTIONS
+{
+  . = __PAGE_OFFSET + 0x100000;
+  /* read-only */
+  _text = .;                   /* Text and read-only data */
+  .text : {
+       *(.text)
+       SCHED_TEXT
+       LOCK_TEXT
+       *(.fixup)
+       *(.gnu.warning)
+       } = 0x9090
+
+  _etext = .;                  /* End of text section */
+
+  . = ALIGN(16);               /* Exception table */
+  __start___ex_table = .;
+  __ex_table : { *(__ex_table) }
+  __stop___ex_table = .;
+
+  RODATA
+
+  /* writeable */
+  .data : {                    /* Data */
+       *(.data)
+       CONSTRUCTORS
+       }
+
+  . = ALIGN(4096);
+  __nosave_begin = .;
+  .data_nosave : { *(.data.nosave) }
+  . = ALIGN(4096);
+  __nosave_end = .;
+
+  . = ALIGN(4096);
+  .data.page_aligned : { *(.data.idt) }
+
+  . = ALIGN(32);
+  .data.cacheline_aligned : { *(.data.cacheline_aligned) }
+
+  _edata = .;                  /* End of data section */
+
+  . = ALIGN(THREAD_SIZE);      /* init_task */
+  .data.init_task : { *(.data.init_task) }
+
+  /* will be freed after init */
+  . = ALIGN(4096);             /* Init code and data */
+  __init_begin = .;
+  .init.text : { 
+       _sinittext = .;
+       *(.init.text)
+       _einittext = .;
+  }
+  .init.data : { *(.init.data) }
+  . = ALIGN(16);
+  __setup_start = .;
+  .init.setup : { *(.init.setup) }
+  __setup_end = .;
+  __initcall_start = .;
+  .initcall.init : {
+       *(.initcall1.init) 
+       *(.initcall2.init) 
+       *(.initcall3.init) 
+       *(.initcall4.init) 
+       *(.initcall5.init) 
+       *(.initcall6.init) 
+       *(.initcall7.init)
+  }
+  __initcall_end = .;
+  __con_initcall_start = .;
+  .con_initcall.init : { *(.con_initcall.init) }
+  __con_initcall_end = .;
+  SECURITY_INIT
+  . = ALIGN(4);
+  __alt_instructions = .;
+  .altinstructions : { *(.altinstructions) } 
+  __alt_instructions_end = .; 
+ .altinstr_replacement : { *(.altinstr_replacement) } 
+  /* .exit.text is discard at runtime, not link time, to deal with references
+     from .altinstructions and .eh_frame */
+  .exit.text : { *(.exit.text) }
+  .exit.data : { *(.exit.data) }
+  . = ALIGN(4096);
+  __initramfs_start = .;
+  .init.ramfs : { *(.init.ramfs) }
+  __initramfs_end = .;
+  . = ALIGN(32);
+  __per_cpu_start = .;
+  .data.percpu  : { *(.data.percpu) }
+  __per_cpu_end = .;
+  . = ALIGN(4096);
+  __init_end = .;
+  /* freed after init ends here */
+       
+  __bss_start = .;             /* BSS */
+  .bss : {
+       *(.bss.page_aligned)
+       *(.bss)
+  }
+  . = ALIGN(4);
+  __bss_stop = .; 
+
+  _end = . ;
+
+  /* This is where the kernel creates the early boot page tables */
+  . = ALIGN(4096);
+  pg0 = .;
+
+  /* Sections to be discarded */
+  /DISCARD/ : {
+       *(.exitcall.exit)
+       }
+
+  /* Stabs debugging sections.  */
+  .stab 0 : { *(.stab) }
+  .stabstr 0 : { *(.stabstr) }
+  .stab.excl 0 : { *(.stab.excl) }
+  .stab.exclstr 0 : { *(.stab.exclstr) }
+  .stab.index 0 : { *(.stab.index) }
+  .stab.indexstr 0 : { *(.stab.indexstr) }
+  .comment 0 : { *(.comment) }
+}
+#endif