|Summary:||cortex-m3: SVC is not permitted on this architecture|
|Product:||binutils||Reporter:||Enrico Scholz <enrico.scholz>|
|Severity:||normal||CC:||dan, kseinitzer, lancos, mgretton, nickc, stano|
update ARM_AEXT_V7_ARM macro to include ARM_OS_EXT flag
Mark ARMv7 as having OS extension, add testcase, fix 1/5 regressions
Description Enrico Scholz 2010-12-08 12:44:44 UTC
While building code like $ echo 'svc 0' > /tmp/x.s $ arm-linux-gnueabi-as -mcpu=cortex-m3 /tmp/x.s /tmp/x.s: Assembler messages: /tmp/x.s:1: Error: SVC is not permitted on this architecture 'svc' is a valid operation on Cortex-M3 cpus and code was accepted by previous binutils version. Report is against 63afe4ed46b5b8c21445192c9046d1c3de2859ec
Comment 1 Claudio 2010-12-17 22:42:05 UTC
I have the same issue while compiling freertos for cortex-m3 (that uses the 'svc 0' instruction) with binutils 2.21: "Error: SVC is not permitted on this architecture" building with binutils 2.20.1 works fine.
Comment 2 Dan McDonald 2011-03-29 19:52:08 UTC
Created attachment 5340 [details] update ARM_AEXT_V7_ARM macro to include ARM_OS_EXT flag This also affects target arm-none-eabi. Like Claudio, I am also trying to compile FreeRTOS. It looks like the v7 processor profile (which the Cortex-M3 is an example of) neglects to mark the "os" extension as being available. I attached a diff against CVS that fixes this issue for me. The patch updates the ARM_AEXT_V7_ARM macro to also include the ARM_OS_EXT flag. I believe that all v7 processors have the SVC instruction (based on the v7-M and v7-AR reference manuals). $ echo 'svc 0' > /tmp/x.s $ arm-none-eabi-as -mcpu=cortex-m3 /tmp/x.s -o /tmp/x.o $ arm-none-eabi-objdump -d /tmp/x.o /tmp/x.o: file format elf32-littlearm Disassembly of section .text: 00000000 <.text>: 0: df00 svc 0
Comment 3 Matthew Gretton-Dann 2011-03-30 09:32:31 UTC
(In reply to comment #2) > It looks like the v7 processor profile (which the Cortex-M3 is an example of) > neglects to mark the "os" extension as being available. This is indeed the case. Mistake on my part when creating the initial patch. Please submit a patch - with testcase - to the binutils mailing list.
Comment 4 Dan McDonald 2011-03-31 19:22:01 UTC
Created attachment 5347 [details] Mark ARMv7 as having OS extension, add testcase, fix 1/5 regressions The previous patch introduced 5 test failure regressions. Failure #1: The patch somehow changed the armv7 attr table to include a new line, "Tag_CPU_arch_profile: Microcontroller". This new patch modifies the expect script to allow this change, but I don't know if this is correct behavior. Failures #2-5: Instructions of the form "msr APSR_<bits>,<imm|reg>" now generate syntax errors. Previously, using an immediate for the operand would generate a different error that was explicitly checked for, and registers as the second operand would assemble into valid instructions. I spent some time with it (I think the problem manifests in parse_operands(), but probably doesn't originate there) but this takes more effort that I can commit to figure out what is going wrong. This patch makes no attempt to fix these problems. Finally, this patch enhances a testcase to verify the svc instruction compiles correctly.
Comment 5 email@example.com 2011-04-11 15:23:12 UTC
CVSROOT: /cvs/src Module name: src Changes by: firstname.lastname@example.org 2011-04-11 15:23:09 Modified files: gas/testsuite : ChangeLog gas/testsuite/gas/arm: arch7.d arch7.s attr-march-armv7.d include/opcode : ChangeLog arm.h Log message: PR gas/12296 * arm.h (ARM_AEXT_V7_ARM): Add ARM_EXT_OS. * gas/arm/arch7.s: Add SVC insn. * gas/arm/arch7.d: Add disassembly of SVC insn. * gas/arm/attr-march-armv7.d: Add arch profile tag. Patches: http://sourceware.org/cgi-bin/cvsweb.cgi/src/gas/testsuite/ChangeLog.diff?cvsroot=src&r1=1.1879&r2=1.1880 http://sourceware.org/cgi-bin/cvsweb.cgi/src/gas/testsuite/gas/arm/arch7.d.diff?cvsroot=src&r1=1.6&r2=1.7 http://sourceware.org/cgi-bin/cvsweb.cgi/src/gas/testsuite/gas/arm/arch7.s.diff?cvsroot=src&r1=1.2&r2=1.3 http://sourceware.org/cgi-bin/cvsweb.cgi/src/gas/testsuite/gas/arm/attr-march-armv7.d.diff?cvsroot=src&r1=1.3&r2=1.4 http://sourceware.org/cgi-bin/cvsweb.cgi/src/include/opcode/ChangeLog.diff?cvsroot=src&r1=1.435&r2=1.436 http://sourceware.org/cgi-bin/cvsweb.cgi/src/include/opcode/arm.h.diff?cvsroot=src&r1=1.24&r2=1.25
Comment 6 Matthew.Gretton-Dann 2011-04-11 15:24:00 UTC
Hi, I am out of the office until Monday 18th April 2011, and will not be reading email. If you have an urgent issue please get in touch with Richard Earnshaw. Otherwise, I will get back to you as soon as possible after I am back in the office on Monday 18th April 2011. Thanks, Matt
Comment 7 Nick Clifton 2011-04-11 15:24:41 UTC
Hi Dan, Thanks very much for revised patch. I have now checked it in along with these changelog entries. Cheers Nick include/opcode/ChangeLog 2011-04-11 Dan McDonald <email@example.com> PR gas/12296 * arm.h (ARM_AEXT_V7_ARM): Add ARM_EXT_OS. gas/testsuite/ChangeLog 2011-04-11 Dan McDonald <firstname.lastname@example.org> PR gas/12296 * gas/arm/arch7.s: Add SVC insn. * gas/arm/arch7.d: Add disassembly of SVC insn. * gas/arm/attr-march-armv7.d: Add arch profile tag.
Comment 8 Nick Clifton 2011-04-11 15:25:17 UTC