> Function symbols are always checked for interworking conflicts, as > before. No modification to the actual relocation code is > required, since this code does not take bit of the > location->destination offset into account in any case. > This patch removes the extraneous Thumb bit check for non-function > symbols, enabling modules containing the affected relocation types > to be loaded. Because these instructions never > interwork, the implied Thumb bit in the addend is 1, and the > destination is Thumb by definition. The addend defines > the precise offset to the target location, but since the addend is > encoded in a non-interworking Thumb branch instruction, there is no > explicit Thumb bit in the addend. > The existing relocation code for R_ARM_THM_CALL/R_ARM_THM_JUMP24 > interprets this case as an error, because the target symbol appears > to be an ARM symbol but this is really not the case, since the > target symbol is just a base in these cases. Some inline assembler > generates references of this type, such as fixup code generated by > macros in. > However, sometimes a branch is relocated against a non-function > symbol for example, PC-relative branches to anonymous assembler > local symbols are typically fixed up against the start-of-section > symbol, which is not a function symbol. > The "Thumb bit" of a symbol is only really meaningful for function > symbols (STT_FUNC). Location->destination offset into account in any case.įunction symbols are always checked for interworking conflicts, asĪrch/arm/kernel/module.c | 13 +++++++++++-ġ files changed, 11 insertions(+), 2 deletions(-)Ĭatalin Marinas June 1, 2011, 9:27 a.m. Required, since this code does not take bit of the No modification to the actual relocation code is Symbols, enabling modules containing the affected relocation types This patch removes the extraneous Thumb bit check for non-function Interwork, the implied Thumb bit in the addend is 1, and the The precise offset to the target location, but since the addend isĮncoded in a non-interworking Thumb branch instruction, there is noĮxplicit Thumb bit in the addend. Target symbol is just a base in these cases. To be an ARM symbol but this is really not the case, since the Interprets this case as an error, because the target symbol appears The existing relocation code for R_ARM_THM_CALL/R_ARM_THM_JUMP24 Generates references of this type, such as fixup code generated by Local symbols are typically fixed up against the start-of-section Symbol for example, PC-relative branches to anonymous assembler However, sometimes a branch is relocated against a non-function The "Thumb bit" of a symbol is only really meaningful for function Tip-bot for Dave Martin May 31, 2011, 4:27 p.m. Sender: IP, sender and recipient auto-whitelisted, not delayed by Low trust Ĭontent-Type: text/plain charset="us-ascii" 0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at , 1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% Summary: Content analysis details: (-2.6 points, 5.0 required) X-Spam-Report: SpamAssassin version 3.3.2-r929478 on To: ARM: Thumb-2: Relax relocation requirements for Received: by wyb28 with SMTP id 28so4496941wyb.36 Received: from ()īy with esmtps (Exim 4.76 #1 (Red Hat Linux)) Received: from localhost ( helo=)īy with esmtp (Exim 4.76 #1 (Red Hat Linux)) (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO)
0 Comments
Leave a Reply. |