target/linux/coldfire/patches/059-mcfv4e_vdso_headers.patch

   1 From a05af27aec00eacf533ff111ba8eb3dec328d9af Mon Sep 17 00:00:00 2001
   2 From: Kurt Mahan <kmahan@freescale.com>
   3 Date: Thu, 22 May 2008 11:20:53 -0600
   4 Subject: [PATCH] Initial vDSO header changes.
   5
   6 LTIBName: mcfv4e-vdso-headers
   7 Signed-off-by: Kurt Mahan <kmahan@freescale.com>
   8 ---
   9  include/asm-m68k/auxvec.h |    9 +++++++++
  10  include/asm-m68k/elf.h    |   31 +++++++++++++++++++++++++++++++
  11  include/asm-m68k/page.h   |    5 +++++
  12  3 files changed, 45 insertions(+), 0 deletions(-)
  13
  14 --- a/include/asm-m68k/auxvec.h
  15 +++ b/include/asm-m68k/auxvec.h
  16 @@ -1,4 +1,13 @@
  17  #ifndef __ASMm68k_AUXVEC_H
  18  #define __ASMm68k_AUXVEC_H
  19 +/*
  20 + * Architecture-neutral AT_ values in 0-17, leave some room
  21 + * for more of them.
  22 + */
  23 +
  24 +#ifdef CONFIG_VSYSCALL
  25 +/* Entry point to the vsyscall page */
  26 +#define        AT_SYSINFO_EHDR         33
  27 +#endif
  28
  29  #endif
  30 --- a/include/asm-m68k/elf.h
  31 +++ b/include/asm-m68k/elf.h
  32 @@ -136,4 +136,35 @@ typedef struct user_m68kfp_struct elf_fp
  33
  34  #define SET_PERSONALITY(ex, ibcs2) set_personality((ibcs2)?PER_SVR4:PER_LINUX)
  35
  36 +/*
  37 + * VDSO
  38 + */
  39 +#ifdef CONFIG_VSYSCALL
  40 +extern unsigned int vdso_enabled;
  41 +
  42 +#define        VDSO_BASE               ((unsigned long)current->mm->context.vdso)
  43 +#define        VDSO_SYM(x)             (VDSO_BASE + (unsigned long)(x))
  44 +
  45 +#define        VSYSCALL_AUX_ENT                                        \
  46 +       if (vdso_enabled)                                       \
  47 +               NEW_AUX_ENT(AT_SYSINFO_EHDR, VDSO_BASE);
  48 +
  49 +/* additional pages */
  50 +#define ARCH_HAS_SETUP_ADDITIONAL_PAGES        1
  51 +
  52 +struct linux_binprm;
  53 +extern int arch_setup_additional_pages(struct linux_binprm *bprm,
  54 +                                      int executable_stack);
  55 +
  56 +#else
  57 +/* no VSYSCALL_AUX_ENT */
  58 +#define        VSYSCALL_AUX_ENT
  59 +#endif
  60 +
  61 +#define ARCH_DLINFO                                            \
  62 +do {                                                           \
  63 +       /* vsyscall entry */                                    \
  64 +       VSYSCALL_AUX_ENT;                                       \
  65 +} while (0);
  66 +
  67  #endif
  68 --- a/include/asm-m68k/page.h
  69 +++ b/include/asm-m68k/page.h
  70 @@ -252,4 +252,9 @@ static inline __attribute_const__ int __
  71
  72  #include <asm-generic/page.h>
  73
  74 +#ifdef CONFIG_VSYSCALL
  75 +/* vDSO support */
  76 +#define __HAVE_ARCH_GATE_AREA
  77 +#endif
  78 +
  79  #endif /* _M68K_PAGE_H */