Stefan Reinauer (stefan.reinauer@coreboot.org) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/2822
-gerrit
commit 15f7993590b90e61ee85ce4bf1d9a3e8b5b5787f Author: Aaron Durbin adurbin@chromium.org Date: Fri Mar 1 17:00:39 2013 -0600
rmodule: correct ordering of bss clearing
This patch fixes an issue for rmodules which are copied into memory at the final load/link location. If the bss section is cleared for that rmodule the relocation could not take place properly since the relocation information was wiped by act of clearing the bss. The reason is that the relocation information resides at the same address as the bss section. Correct this issue by performing the relocation before clearing the bss.
Change-Id: I01a124a8201321a9eaf6144c743fa818c0f004b4 Signed-off-by: Aaron Durbin adurbin@chromium.org --- src/lib/rmodule.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/src/lib/rmodule.c b/src/lib/rmodule.c index 60c89f0..d36f9f3 100644 --- a/src/lib/rmodule.c +++ b/src/lib/rmodule.c @@ -241,14 +241,18 @@ static int __rmodule_load(void *base, struct rmodule *module, int clear_bss) * In order to load the module at a given address, the following steps * take place: * 1. Copy payload to base address. - * 2. Clear the bss segment. - * 3. Adjust relocations within the module to new base address. + * 2. Adjust relocations within the module to new base address. + * 3. Clear the bss segment last since the relocations live where + * the bss is. If an rmodule is being loaded from its load + * address the relocations need to be processed before the bss. */ module->location = base; rmodule_copy_payload(module); + if (rmodule_relocate(module)) + return -1; if (clear_bss) rmodule_clear_bss(module); - return rmodule_relocate(module); + return 0; }
int rmodule_load(void *base, struct rmodule *module)