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authorRusty Russell <rusty@rustcorp.com.au>2007-07-26 23:35:43 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-28 22:53:36 -0400
commita8a11f06973fa63ad692a8f97694cb5eeb70b3f3 (patch)
treed26b297464d413f7b7d05bc80c76d66743865d2a /drivers
parentdfbab7540569679a91cf43208eff4ef3f4500a5f (diff)
Fix lguest bzImage loading with CONFIG_RELOCATABLE=y
Jason Yeh sent his crashing .config: bzImages made with CONFIG_RELOCATABLE=y put the relocs where the BSS is expected, and we crash with unusual results such as: lguest: unhandled trap 14 at 0xc0122ae1 (0xa9) Relying on BSS being zero was merely laziness on my part, and unfortunately, lguest doesn't go through the normal startup path (which does this in asm). Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/lguest/lguest.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/lguest/lguest.c b/drivers/lguest/lguest.c
index 6dfe568523a2..3386b0e76900 100644
--- a/drivers/lguest/lguest.c
+++ b/drivers/lguest/lguest.c
@@ -1019,6 +1019,11 @@ __init void lguest_init(void *boot)
1019 * the normal data segment to get through booting. */ 1019 * the normal data segment to get through booting. */
1020 asm volatile ("mov %0, %%fs" : : "r" (__KERNEL_DS) : "memory"); 1020 asm volatile ("mov %0, %%fs" : : "r" (__KERNEL_DS) : "memory");
1021 1021
1022 /* Clear the part of the kernel data which is expected to be zero.
1023 * Normally it will be anyway, but if we're loading from a bzImage with
1024 * CONFIG_RELOCATALE=y, the relocations will be sitting here. */
1025 memset(__bss_start, 0, __bss_stop - __bss_start);
1026
1022 /* The Host uses the top of the Guest's virtual address space for the 1027 /* The Host uses the top of the Guest's virtual address space for the
1023 * Host<->Guest Switcher, and it tells us how much it needs in 1028 * Host<->Guest Switcher, and it tells us how much it needs in
1024 * lguest_data.reserve_mem, set up on the LGUEST_INIT hypercall. */ 1029 * lguest_data.reserve_mem, set up on the LGUEST_INIT hypercall. */