target/linux/coldfire/patches/049-mcfv4e_linker_bss_cleanup.patch

   1 From 4e16f08c800d57b986217e0d39d4a06b5bdf641d Mon Sep 17 00:00:00 2001
   2 From: Kurt Mahan <kmahan@freescale.com>
   3 Date: Wed, 19 Mar 2008 17:37:44 -0600
   4 Subject: [PATCH] Move BSS section in linker script and zero it on boot.
   5
   6 To work with the latest round of toolchains the bss section
   7 in the linker script needed to be moved to the end (due to
   8 the linker thinking there were overlapping sections).
   9
  10 The BSS section needs to be manually zeroed.
  11
  12 LTIBName: mcfv4e-linker-bss-cleanup
  13 Signed-off-by: Kurt Mahan <kmahan@freescale.com>
  14 ---
  15  arch/m68k/coldfire/head.S         |   11 +++++++++++
  16  arch/m68k/coldfire/vmlinux-cf.lds |   11 ++++++++---
  17  2 files changed, 19 insertions(+), 3 deletions(-)
  18
  19 --- a/arch/m68k/coldfire/head.S
  20 +++ b/arch/m68k/coldfire/head.S
  21 @@ -321,6 +321,17 @@ ENTRY(__start)
  22         movec   %d0, %acr3
  23         nop
  24
  25 +#ifdef CONFIG_COLDFIRE
  26 +/* zero bss */
  27 +       lea     _sbss,%a0
  28 +       lea     _ebss,%a1
  29 +       clrl    %d0
  30 +_loop_bss:
  31 +       movel   %d0,(%a0)+
  32 +       cmpl    %a0,%a1
  33 +       bne     _loop_bss
  34 +#endif
  35 +
  36         /* If you change the memory size to another value make a matching
  37            change in paging_init(cf-mmu.c) to zones_size[]. */
  38
  39 --- a/arch/m68k/coldfire/vmlinux-cf.lds
  40 +++ b/arch/m68k/coldfire/vmlinux-cf.lds
  41 @@ -51,9 +51,6 @@ SECTIONS
  42         CONSTRUCTORS
  43    } :data
  44
  45 -  .bss : AT(ADDR(.bss) - LOAD_OFFSET) {                /* BSS */
  46 -       *(.bss)
  47 -  }
  48
  49    . = ALIGN(16);
  50    .data.cacheline_aligned : AT(ADDR(.data.cacheline_aligned) - LOAD_OFFSET ) {
  51 @@ -62,6 +59,8 @@ SECTIONS
  52
  53    _edata = .;                  /* End of data section */
  54
  55 +  NOTES                                /* support ld --build-id */
  56 +
  57    . = ALIGN(8192);             /* Initrd */
  58    .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {
  59         __init_begin = .;
  60 @@ -111,6 +110,12 @@ SECTIONS
  61         *(.data.init_task)      /* The initial task and kernel stack */
  62    }
  63
  64 +  _sbss = .;
  65 +  .bss : AT(ADDR(.bss) - LOAD_OFFSET) {                /* BSS */
  66 +       *(.bss)
  67 +  }
  68 +  _ebss = .;
  69 +
  70    _end = . ;
  71
  72    /* Sections to be discarded */