13153 2019-01-29 07:02:31 +0000 [2.7 M2 RC1] Systemtap doesn't work on beaglebone 2019-04-04 22:12:55 +0000 1 1 7 Build System, Metadata & Runtime BSPs bsps-meta-yocto 2.7 x86 Multiple RESOLVED FIXED Medium+ normal 2.7 M4 1 yi.zhao richard.purdie bruce.ashfield ee.peng.yeoh jon.mason kexin.hao raj.khem randy.macleod richard.purdie yi.zhao yi.zhao --- New (Never tested) Don't know oldest_to_newest 82886 0 4423 yi.zhao 2019-01-29 07:02:31 +0000 Created attachment 4423 hello.stp Image location: https://autobuilder.yocto.io/pub/releases/yocto-2.7_M2.rc1/machines/beaglebone-yocto/ Git rev: master/1979d9162a335b7d4718a6697ca57bfa16237f0e Steps: 1. Download beaglebone core-image-sato-sdk wic image from the above link. 2. Deploy wic image to MircoSD card and boot up system. 3. Run the following commands: $ cd /usr/src/kernel && make scripts prepare $ cd /lib/modules/`uname -r` && (if [ ! -e build ]; then ln -s /usr/src/kernel build; fi) $ stap -v hello.stp Error message: ####################### WARNING: Kernel function symbol table missing [man warning::symbols] Pass 1: parsed user script and 455 library scripts using 42240virt/38012res/4420shr/33844data kb, in 2760usr/320sys/3650real ms. Pass 2: analyzed script: 1 probe, 1 function, 0 embeds, 0 globals using 42900virt/39064res/4796shr/34504data kb, in 80usr/0sys/94real ms. Pass 3: translated to C into "/tmp/stapPLZfVw/stap_b96925f4faa7752eac6b01c61572abd0_999_src.c" using 42900virt/39460res/5164shr/34504data kb, in 0usr/0sys/3real ms. /tmp/cc6PhxVa.s: Assembler messages: /tmp/cc6PhxVa.s:1055: Error: selected processor does not support `cpsid i' in ARM mode /tmp/cc6PhxVa.s:1142: Error: selected processor does not support `cpsid i' in ARM mode /tmp/cc6PhxVa.s:1206: Error: selected processor does not support `cpsid i' in ARM mode /tmp/cc6PhxVa.s:1288: Error: selected processor does not support `cpsid i' in ARM mode /tmp/cc6PhxVa.s:2361: Error: selected processor does not support `ldrex r0,[r2]' in ARM mode /tmp/cc6PhxVa.s:2364: Error: selected processor does not support `strexeq ip,r1,[r2]' in ARM mode /tmp/cc6PhxVa.s:2461: Error: selected processor does not support `ldrex r2,[r3]' in ARM mode /tmp/cc6PhxVa.s:2463: Error: selected processor does not support `strex r1,r2,[r3]' in ARM mode /tmp/cc6PhxVa.s:2474: Error: selected processor does not support `ldrex r2,[r3]' in ARM mode /tmp/cc6PhxVa.s:2476: Error: selected processor does not support `strex r1,r2,[r3]' in ARM mode /tmp/cc6PhxVa.s:2524: Error: selected processor does not support `cpsid i' in ARM mode /tmp/cc6PhxVa.s:2572: Error: selected processor does not support `ldrex r3,[r4]' in ARM mode /tmp/cc6PhxVa.s:2574: Error: selected processor does not support `strex r2,r3,[r4]' in ARM mode /tmp/cc6PhxVa.s:2630: Error: selected processor does not support `ldrex r3,[r4]' in ARM mode /tmp/cc6PhxVa.s:2632: Error: selected processor does not support `strex r2,r3,[r4]' in ARM mode /tmp/cc6PhxVa.s:2682: Error: selected processor does not support `cpsid i' in ARM mode /tmp/cc6PhxVa.s:2717: Error: selected processor does not support `isb ' in ARM mode /tmp/cc6PhxVa.s:2730: Error: selected processor does not support `isb ' in ARM mode /tmp/cc6PhxVa.s:2751: Error: selected processor does not support `ldrex r3,[r5]' in ARM mode /tmp/cc6PhxVa.s:2753: Error: selected processor does not support `strex r2,r3,[r5]' in ARM mode /tmp/cc6PhxVa.s:2806: Error: selected processor does not support `ldrex r1,[r2]' in ARM mode /tmp/cc6PhxVa.s:2808: Error: selected processor does not support `strex r0,r1,[r2]' in ARM mode /tmp/cc6PhxVa.s:2880: Error: selected processor does not support `ldrex r1,[r2]' in ARM mode /tmp/cc6PhxVa.s:2882: Error: selected processor does not support `strex r0,r1,[r2]' in ARM mode /tmp/cc6PhxVa.s:2894: Error: selected processor does not support `ldrex r1,[r2]' in ARM mode /tmp/cc6PhxVa.s:2896: Error: selected processor does not support `strex r0,r1,[r2]' in ARM mode /tmp/cc6PhxVa.s:3472: Error: selected processor does not support `isb ' in ARM mode /tmp/cc6PhxVa.s:3492: Error: selected processor does not support `isb ' in ARM mode /tmp/cc6PhxVa.s:3578: Error: selected processor does not support `isb ' in ARM mode /tmp/cc6PhxVa.s:3598: Error: selected processor does not support `isb ' in ARM mode /tmp/cc6PhxVa.s:3820: Error: selected processor does not support `cpsid i' in ARM mode /tmp/cc6PhxVa.s:3893: Error: selected processor does not support `ldrex r3,[r6]' in ARM mode /tmp/cc6PhxVa.s:3895: Error: selected processor does not support `strex r2,r3,[r6]' in ARM mode /tmp/cc6PhxVa.s:3996: Error: selected processor does not support `ldrex r1,[r2]' in ARM mode /tmp/cc6PhxVa.s:3998: Error: selected processor does not support `strex r0,r1,[r2]' in ARM mode /tmp/cc6PhxVa.s:4343: Error: selected processor does not support `cpsid i' in ARM mode /tmp/cc6PhxVa.s:4397: Error: selected processor does not support `cpsid i' in ARM mode /tmp/cc6PhxVa.s:4439: Error: selected processor does not support `ldrex r3,[r5]' in ARM mode /tmp/cc6PhxVa.s:4441: Error: selected processor does not support `strex r2,r3,[r5]' in ARM mode /tmp/cc6PhxVa.s:4509: Error: selected processor does not support `ldrex r3,[r5]' in ARM mode /tmp/cc6PhxVa.s:4509: Error: selected processor does not support `ldrex r3,[r5]' in ARM mode /tmp/cc6PhxVa.s:4511: Error: selected processor does not support `strex r2,r3,[r5]' in ARM mode /tmp/cc6PhxVa.s:4608: Error: selected processor does not support `cpsid i' in ARM mode /tmp/cc6PhxVa.s:4645: Error: selected processor does not support `ldrex r3,[r4]' in ARM mode /tmp/cc6PhxVa.s:4647: Error: selected processor does not support `strex r2,r3,[r4]' in ARM mode /tmp/cc6PhxVa.s:5572: Error: selected processor does not support `ldrex r2,[r3]' in ARM mode /tmp/cc6PhxVa.s:5574: Error: selected processor does not support `strex r1,r2,[r3]' in ARM mode /tmp/cc6PhxVa.s:5587: Error: selected processor does not support `cpsid i' in ARM mode /tmp/cc6PhxVa.s:5617: Error: selected processor does not support `ldrex r3,[r4]' in ARM mode /tmp/cc6PhxVa.s:5619: Error: selected processor does not support `strex r2,r3,[r4]' in ARM mode /tmp/cc6PhxVa.s:5685: Error: selected processor does not support `ldrex r2,[r3]' in ARM mode /tmp/cc6PhxVa.s:5687: Error: selected processor does not support `strex r1,r2,[r3]' in ARM mode /tmp/cc6PhxVa.s:5751: Error: selected processor does not support `ldrex r0,[r2]' in ARM mode /tmp/cc6PhxVa.s:5754: Error: selected processor does not support `strexeq ip,r1,[r2]' in ARM mode /tmp/cc6PhxVa.s:6038: Error: selected processor does not support `isb ' in ARM mode /tmp/cc6PhxVa.s:6050: Error: selected processor does not support `isb ' in ARM mode /tmp/cc6PhxVa.s:6115: Error: selected processor does not support `isb ' in ARM mode /tmp/cc6PhxVa.s:6128: Error: selected processor does not support `isb ' in ARM mode /tmp/cc6PhxVa.s:6159: Error: selected processor does not support `ldrex r2,[r3]' in ARM mode /tmp/cc6PhxVa.s:6162: Error: selected processor does not support `strexeq r0,r1,[r3]' in ARM mode /tmp/cc6PhxVa.s:6269: Error: selected processor does not support `ldrex r2,[r8]' in ARM mode /tmp/cc6PhxVa.s:6272: Error: selected processor does not support `strexeq r5,r3,[r8]' in ARM mode /tmp/cc6PhxVa.s:6333: Error: selected processor does not support `isb ' in ARM mode /tmp/cc6PhxVa.s:6346: Error: selected processor does not support `isb ' in ARM mode /tmp/cc6PhxVa.s:6389: Error: selected processor does not support `isb ' in ARM mode /tmp/cc6PhxVa.s:6403: Error: selected processor does not support `isb ' in ARM mode /tmp/cc6PhxVa.s:6508: Error: selected processor does not support `isb ' in ARM mode /tmp/cc6PhxVa.s:6521: Error: selected processor does not support `isb ' in ARM mode /tmp/cc6PhxVa.s:6581: Error: selected processor does not support `isb ' in ARM mode /tmp/cc6PhxVa.s:6595: Error: selected processor does not support `isb ' in ARM mode /tmp/cc6PhxVa.s:6642: Error: selected processor does not support `isb ' in ARM mode /tmp/cc6PhxVa.s:6655: Error: selected processor does not support `isb ' in ARM mode /tmp/cc6PhxVa.s:6700: Error: selected processor does not support `isb ' in ARM mode /tmp/cc6PhxVa.s:6714: Error: selected processor does not support `isb ' in ARM mode /tmp/cc6PhxVa.s:6758: Error: selected processor does not support `ldrex r8,[r2]' in ARM mode /tmp/cc6PhxVa.s:6761: Error: selected processor does not support `strexeq r1,r3,[r2]' in ARM mode make[1]: *** [scripts/Makefile.build:317: /tmp/stapPLZfVw/stap_b96925f4faa7752eac6b01c61572abd0_999_src.o] Error 1 make: *** [Makefile:1504: _module_/tmp/stapPLZfVw] Error 2 WARNING: kbuild exited with status: 2 Pass 4: compiled C into "stap_b96925f4faa7752eac6b01c61572abd0_999.ko" in 135890usr/14980sys/154617real ms. Pass 4: compilation failed. [man error::pass4] ############################### 82887 1 4424 yi.zhao 2019-01-29 07:03:10 +0000 Created attachment 4424 stap.log 82888 2 yi.zhao 2019-01-29 07:05:27 +0000 The following command can also reproduce the issue: $ stap -ve 'probe oneshot { println("hello world") }' There is no such issue on other BSPs (mpc8315e-rdb and edgerouter). 83224 3 richard.purdie 2019-03-09 16:24:13 +0000 This just affected our transition of qemuarm to armv7a as well :( 83225 4 raj.khem 2019-03-09 17:58:59 +0000 its possible that it was using -march option to set cpu but now we do not pass -march any longer and use -mcpu to do the job. I think thats where the disconnect is. It then ends up selecting armv5 or something for cpu and that will produce such errors. 83227 5 victor.kamensky7 2019-03-10 04:45:55 +0000 Error happens because -march=armv5t option is passed to compiler I was able to reproduce the issue. It is not SystemTap problem per se. For given h/w, gcc, and kernel sources system cannot compile kernel module that uses atomic functions. For example: Using atomic functions test case: root@beaglebone-yocto:~/m# cat hello.c #include <linux/module.h> #include <linux/atomic.h> static atomic_t my_counter = ATOMIC_INIT(1); int init_module (void) { atomic_inc(&my_counter); return 0; } void cleanup_module(void) { } MODULE_LICENSE("GPL"); root@beaglebone-yocto:~/m# cat Makefile obj-m := hello.o root@beaglebone-yocto:~/m# make -C /usr/src/kernel V=1 M=/home/root/m make: Entering directory '/lib/modules/4.18.9-yocto-standard/build' test -e include/generated/autoconf.h -a -e include/config/auto.conf || ( \ echo >&2; \ echo >&2 " ERROR: Kernel configuration is invalid."; \ echo >&2 " include/generated/autoconf.h or include/config/auto.conf are missing.";\ echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ echo >&2 ; \ /bin/false) mkdir -p /home/root/m/.tmp_versions ; rm -f /home/root/m/.tmp_versions/* make -f ./scripts/Makefile.build obj=/home/root/m (cat /dev/null; echo kernel//home/root/m/hello.ko;) > /home/root/m/modules.order gcc -Wp,-MD,/home/root/m/.hello.o.d -nostdinc -isystem /usr/lib/gcc/arm-poky-linux-gnueabi/8.2.0/include -I./arch/arm/include -I./arch/arm/include/generated -I./include -I./arch/arm/include/uapi -I./arch/arm/include/generated/uapi -I./include/uapi -I./include/generated/uapi -include ./include/linux/kconfig.h -include ./include/linux/compiler_types.h -D__KERNEL__ -mlittle-endian -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -fshort-wchar -Werror-implicit-function-declaration -Wno-format-security -std=gnu89 -fno-PIE -DCC_HAVE_ASM_GOTO -fno-dwarf2-cfi-asm -fno-omit-frame-pointer -mapcs -mno-sched-prolog -fno-ipa-sra -mabi=aapcs-linux -mfpu=vfp -funwind-tables -marm -Wa,-mno-warn-deprecated -D__LINUX_ARM_ARCH__=7 -march=armv5t -Wa,-march=armv7-a -msoft-float -Uarm -fno-delete-null-pointer-checks -Wno-frame-address -Wno-format-truncation -Wno-format-overflow -Wno-int-in-bool-context -Os -Wno-maybe-uninitialized --param=allow-store-data-races=0 -Wframe-larger-than=1024 -fstack-protector-strong -Wno-unused-but-set-variable -Wno-unused-const-variable -fno-omit-frame-pointer -fno-optimize-sibling-calls -fno-var-tracking-assignments -g -pg -Wdeclaration-after-statement -Wno-pointer-sign -fno-strict-overflow -fno-merge-all-constants -fmerge-constants -fno-stack-check -fconserve-stack -Werror=implicit-int -Werror=strict-prototypes -Werror=date-time -Werror=incompatible-pointer-types -Werror=designated-init -fmacro-prefix-map=./= -Wno-packed-not-aligned -DMODULE -DKBUILD_BASENAME='"hello"' -DKBUILD_MODNAME='"hello"' -c -o /home/root/m/hello.o /home/root/m/hello.c /tmp/ccbSfHhk.s: Assembler messages: /tmp/ccbSfHhk.s:58: Error: selected processor does not support `ldrex r2,[r3]' in ARM mode /tmp/ccbSfHhk.s:60: Error: selected processor does not support `strex r1,r2,[r3]' in ARM mode make[1]: *** [scripts/Makefile.build:324: /home/root/m/hello.o] Error 1 make: *** [Makefile:1504: _module_/home/root/m] Error 2 make: Leaving directory '/lib/modules/4.18.9-yocto-standard/build' It happens because '-march=armv5t' is passed to gcc. That in turns triggered by CONFIG_CPU_32v7, the following cc-option suggested in arch/arm/Makefile: arch-$(CONFIG_CPU_32v7) =-D__LINUX_ARM_ARCH__=7 $(call cc-option,-march=armv7-a,-march=armv5t -Wa$(comma)-march=armv7-a) And gcc in the system does not understand first choice "-march=armv7-a" root@beaglebone-yocto:~# gcc -march=armv7-a -c foo.c cc1: error: -mfloat-abi=hard: selected processor lacks an FPU and as result fall backs to second choice with -march=armv5t. It looks like gcc is configured with '-march=armv7-a+fp' root@beaglebone-yocto:~# gcc -v -c foo.c 2>&1 | grep COLLECT_GCC_OPTIONS | head -1 COLLECT_GCC_OPTIONS='-v' '-c' '-mfloat-abi=hard' '-mtls-dialect=gnu' '-marm' '-march=armv7-a+fp' root@beaglebone-yocto:~# gcc -march=armv7-a+fp -c foo.c root@beaglebone-yocto:~# The following hack helps: root@beaglebone-yocto:/usr/src/kernel# cat patches/arm-makefile-fix.patch Index: kernel/arch/arm/Makefile =================================================================== --- kernel.orig/arch/arm/Makefile +++ kernel/arch/arm/Makefile @@ -67,7 +67,7 @@ KBUILD_CFLAGS += $(call cc-option,-fno-i # macro, but instead defines a whole series of macros which makes # testing for a specific architecture or later rather impossible. arch-$(CONFIG_CPU_32v7M) =-D__LINUX_ARM_ARCH__=7 -march=armv7-m -Wa,-march=armv7-m -arch-$(CONFIG_CPU_32v7) =-D__LINUX_ARM_ARCH__=7 $(call cc-option,-march=armv7-a,-march=armv5t -Wa$(comma)-march=armv7-a) +arch-$(CONFIG_CPU_32v7) =-D__LINUX_ARM_ARCH__=7 $(call cc-option,-march=armv7-a+fp,-march=armv5t -Wa$(comma)-march=armv7-a) arch-$(CONFIG_CPU_32v6) =-D__LINUX_ARM_ARCH__=6 $(call cc-option,-march=armv6,-march=armv5t -Wa$(comma)-march=armv6) # Only override the compiler option if ARMv6. The ARMv6K extensions are # always available in ARMv7 Checking corresponding kernel host build options used there to build kernel source are '-march=armv7-a -msoft-float' since in cross compilation mode gcc cannot check underlying CPU, so it does not complain. Also if I pass '-march=armv7-a -msoft-float' to gcc invocation on target it works fine, recall that just '-march=armv7-a' failed: root@beaglebone-yocto:~# gcc -march=armv7-a -msoft-float -c foo.c root@beaglebone-yocto:~# I.e one way to look at root@beaglebone-yocto:/usr/src/kernel# cat patches/arm-makefile-fix.patch Index: kernel/arch/arm/Makefile =================================================================== --- kernel.orig/arch/arm/Makefile +++ kernel/arch/arm/Makefile @@ -67,7 +67,7 @@ KBUILD_CFLAGS += $(call cc-option,-fno-i # macro, but instead defines a whole series of macros which makes # testing for a specific architecture or later rather impossible. arch-$(CONFIG_CPU_32v7M) =-D__LINUX_ARM_ARCH__=7 -march=armv7-m -Wa,-march=armv7-m -arch-$(CONFIG_CPU_32v7) =-D__LINUX_ARM_ARCH__=7 $(call cc-option,-march=armv7-a,-march=armv5t -Wa$(comma)-march=armv7-a) +arch-$(CONFIG_CPU_32v7) =-D__LINUX_ARM_ARCH__=7 $(call cc-option,-march=armv7-a -msoft-float,-march=armv5t -Wa$(comma)-march=armv7-a) arch-$(CONFIG_CPU_32v6) =-D__LINUX_ARM_ARCH__=6 $(call cc-option,-march=armv6,-march=armv5t -Wa$(comma)-march=armv6) # Only override the compiler option if ARMv6. The ARMv6K extensions are # always available in ARMv7 I believe the issue is that beaglebone toolchain and sysroot is misconfigured: it is configured with hard float (qemuarm) but beaglebone CPU does not have it. Kernel emulates all hard float instructions so we don't see any effect of it, but it would be very slow. As atomic instructions in KLM compilation is gcc default setting in this case. I believe if beaglebone tune would be switched to soft floating point this issue goes away. Again it does not look as SystemTap bug to me. 83228 6 richard.purdie 2019-03-10 07:31:30 +0000 I managed to narrow this down a bit. root@qemuarm:/usr/src/kernel# env -uARCH -uKBUILD_EXTMOD -uCROSS_COMPILE -uKBUILD_IMAGE -uKCONFIG_CONFIG -uINSTALL_PATH -uLD_LIBRARY_PATH PATH=/usr/bin:/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin make -C /lib/modules/4.19.19-yocto-standard/build M=/tmp/staptcNU6M modules CONFIG_DEBUG_INFO= CONFIG_STACK_VALIDATION= ARCH=arm stap_4321_src.i --no-print-directory -j2 V=1 test -e include/generated/autoconf.h -a -e include/config/auto.conf || ( \ echo >&2; \ echo >&2 " ERROR: Kernel configuration is invalid."; \ echo >&2 " include/generated/autoconf.h or include/config/auto.conf are missing.";\ echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ echo >&2 ; \ /bin/false) mkdir -p /tmp/staptcNU6M/.tmp_versions ; rm -f /tmp/staptcNU6M/.tmp_versions/* make -f ./scripts/Makefile.build obj=/tmp/staptcNU6M (cat /dev/null; echo kernel//tmp/staptcNU6M/stap_4321.ko;) > /tmp/staptcNU6M/modules.order gcc -Wp,-MD,/tmp/staptcNU6M/.stap_4321_src.o.d -nostdinc -isystem /usr/lib/gcc/arm-poky-linux-gnueabi/8.3.0/include -I./arch/arm/include -I./arch/arm/include/generated -I./include -I./arch/arm/include/uapi -I./arch/arm/include/generated/uapi -I./include/uapi -I./include/generated/uapi -include ./include/linux/kconfig.h -include ./include/linux/compiler_types.h -D__KERNEL__ -mlittle-endian -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -fshort-wchar -Werror-implicit-function-declaration -Wno-format-security -std=gnu89 -fno-PIE -DCC_HAVE_ASM_GOTO -fno-dwarf2-cfi-asm -fno-omit-frame-pointer -mapcs -mno-sched-prolog -fno-ipa-sra -mabi=aapcs-linux -mfpu=vfp -funwind-tables -marm -Wa,-mno-warn-deprecated -D__LINUX_ARM_ARCH__=7 -march=armv5t -Wa,-march=armv7-a -msoft-float -Uarm -fno-delete-null-pointer-checks -Wno-frame-address -Wno-format-truncation -Wno-format-overflow -Wno-int-in-bool-context -Os -Wno-maybe-uninitialized --param=allow-store-data-races=0 -Wframe-larger-than=1024 -fstack-protector-strong -Wno-unused-but-set-variable -Wno-unused-const-variable -fno-omit-frame-pointer -fno-optimize-sibling-calls -fno-var-tracking-assignments -pg -Wdeclaration-after-statement -Wno-pointer-sign -Wno-stringop-truncation -fno-strict-overflow -fno-merge-all-constants -fmerge-constants -fno-stack-check -fconserve-stack -Werror=implicit-int -Werror=strict-prototypes -Werror=date-time -Werror=incompatible-pointer-types -Werror=designated-init -fmacro-prefix-map=./= -Wno-packed-not-aligned -Iinclude2/asm/mach-default -I/lib/modules/4.19.19-yocto-standard/build -include /tmp/staptcNU6M/stapconf_4321.h -D "STP_NO_VELREL_CHECK" -freorder-blocks -fasynchronous-unwind-tables -Wframe-larger-than=512 -fno-ipa-icf -Wno-unused -Wno-tautological-compare -Werror -I/usr/share/systemtap/runtime -DMODULE -DKBUILD_BASENAME='"stap_4321_src"' -DKBUILD_MODNAME='"stap_4321"' -c -o /tmp/staptcNU6M/stap_4321_src.o /tmp/staptcNU6M/stap_4321_src.c /tmp/ccaE9CMG.s: Assembler messages: /tmp/ccaE9CMG.s:49: Error: selected processor does not support `dmb ish' in ARM mode /tmp/ccaE9CMG.s:52: Error: architectural extension `mp' is not allowed for the current b (which was from running the stap command with -v -v -v -k and then being able to run the command individually) Note that it says armv5t above. That comes from: arch/arm/Makefile: arch-$(CONFIG_CPU_32v7) =-D__LINUX_ARM_ARCH__=7 $(call cc-option,-march=armv7-a,-march=armv5t -Wa$(comma)-march=armv7-a) root@qemuarm:/usr/src/kernel# gcc -march=armv7-a /tmp/staptcNU6M/stap_4321_aux_0.c cc1: error: -mfloat-abi=hard: selected processor lacks an FPU which makes me wonder if cc-option fails unless -mfpu-vfp is on the commandline too. Since we know our gcc supports this option I'm going to try with: arch-$(CONFIG_CPU_32v7) =-D__LINUX_ARM_ARCH__=7 -march=armv7-a -Wa$(comma)-march=armv7-a 83229 7 richard.purdie 2019-03-10 07:33:18 +0000 Victor, looks like we reached the same conclusion of where the issue is (I was on a flight and had a look so I hadn't seen your comment until now). I think this may be a glitch in the way cc-option works in the kernel, I'm going to test with it removed... 83230 8 richard.purdie 2019-03-10 07:56:12 +0000 Confirmed the test passes if the option is removed. 83231 9 victor.kamensky7 2019-03-10 08:19:12 +0000 Hi Richard, > Confirmed the test passes if the option is removed. Is it on beaglebone or qemuarm?. It seems it is on qemuarm. Note original issue was reported on beaglebone, and as per my notes issue there is because beaglebone CPU does not h/w floating point. As per my notes on beaglebone option that you suggest won't work. gcc will complain that gcc is not configured with soft float (unless it has changed since time I looked at it; gcc config could be seen with 'gcc -v -c foo.c 2>&1 | grep COLLECT_GCC_OPTIONS | head -1' command). If you issue is on qemuarm, your result is a bit weird. I wonder why cc-option macro does not really work. My understanding that kernel makefile will try to compile test file with '-march=armv7-a', if it is successful it will just use it, otherwise it will try '-march=armv5t -Wa$(comma)-march=armv7-a' I.e difference between '$(call cc-option,-march=armv7-a,-march=armv5t -Wa$(comma)-march=armv7-a) and direct option you tried "-D__LINUX_ARM_ARCH__=7 -march=armv7-a -Wa$(comma)-march=armv7-a" would be "-Wa$(comma)-march=armv7-a" (assuming that cc-option works as expected), which should not really matter unless binutils not configured correctly. It would be interesting to dig in why cc-option does not work as expected. Is it qemuarm on latest committed OE, or there are some additional changes. If I could reproduce it, I can try to look at it tomorrow. Going back to beaglebone issue I think your fix won't help unless default is soft float in armv7-a case. Note my suggestion to use soft float tune for beaglebone sysroot is actually problematic if qemuarm target is configured with hard float, since in this case artifacts cannot be shared. Thanks, Victor 83232 10 victor.kamensky7 2019-03-10 08:28:34 +0000 Richard, I've read your notes really carefully :) just after my reply :( What changes did you do? Did you just add -msoft-float to compilation line? Apparently it looks like qemuarm also cannot execute hard float instructions, the same as beaglebone (it is bit strange though because it is used to work, ?was qemu config changed?). Now, it begs the question why arm default tune has hard float on, if both primary testing targets (qemuarm and beaglebone) cannot execute hard float instruction and kernel needs to emulate them. 83233 11 raj.khem 2019-03-10 15:31:28 +0000 we configure target gcc with qualified architecture with extentions e.g. --with-arch=armv7ve+fp when call convention hard is used in tunes. So ideally one does not need to specify -march option if target is same ( native ) when building something on target. However, when we specify -march=armv7-a then we want to override the defaults but this option means that we do not spefify floating-point support, but gcc is configured for hard-floating calling convention which requires fp to work. Thats why you get the error. So options are either use -march=armv7-a -mfloat-abi=softfp which will make it use soft calling convention or -march=armv7-a+fp ( or -march=armv7-a -mfpu=vfp) which will indicate that we do have fp. so the Makefile should be changed to use one of the above options. e.g. arch-$(CONFIG_CPU_32v7) =-D__LINUX_ARM_ARCH__=7 $(call cc-option,-march=armv7-a+fp,-march=armv5t -Wa$(comma)-march=armv7-a) 83234 12 victor.kamensky7 2019-03-10 18:53:32 +0000 Khem, thank you for clarification. Now I understand why dropping cc-option works for Richard (answering my question in Comment 9), it happens that -msoft-float is passed to arm kernel compilation unconditionally latter (kernel always built with soft-float), so when cc-option makefile macro call is dropped, it does not run check that -march=armv7-a option is supported by compiler but when it really compiles code -msoft-float is added and everything goes fine. I think better (possibly upstreamable) option is to keep cc-option macro call but add -msoft-float to it. I.e: arch-$(CONFIG_CPU_32v7) =-D__LINUX_ARM_ARCH__=7 $(call cc-option,-march=armv7-a -msoft-float,-march=armv5t -Wa$(comma)-march=armv7-a) In this case check will go through to and this option will be selected. Let me send this patch upstream and see what they say. Khem, by any chance, do you know gcc commit that introduced -march=armv7-a+fp? It would be good to have it referenced. Also was "+fp" variant was added only to -march=armv7-a or we have similar other variants like -march=armv6+fp or -march=armv6k+fp? ... just to understand whether there are any other cases that would be in similar situation. 83235 13 victor.kamensky7 2019-03-11 00:51:41 +0000 Found what gcc commit introduced '-march=armv7-a+fp' Posted proposed fix upstream on arm linux kernel mailing list: http://lists.infradead.org/pipermail/linux-arm-kernel/2019-March/637809.html 83302 14 richard.purdie 2019-03-21 15:21:37 +0000 We resolved this at least for our usecases in the kernel: http://git.yoctoproject.org/cgit.cgi/poky/commit/?id=75d744c26b2e34e433a80f2478e3d2bf85126672 http://git.yoctoproject.org/cgit.cgi/poky/commit/?id=cda5d455992e1aceae911178b7143b67e0ac29cc Upstream discussions are ongoing. 83314 15 yi.zhao 2019-03-26 02:04:53 +0000 I still got the same error in 2.7 M3 RC1 testing. Image location: https://autobuilder.yocto.io/pub/releases/yocto-2.7_M3.rc1/machines/beaglebone-yocto/ Git rev: master/753e2a0ede4449917c75353b57f13bbafe70fac8 Error message: $ stap -ve 'probe oneshot { println("hello world") }' WARNING: Kernel function symbol table missing [man warning::symbols] Pass 1: parsed user script and 459 library scripts using 42108virt/37924res/4500shr/33676data kb, in 2580usr/460sys/3616real ms. Pass 2: analyzed script: 1 probe, 1 function, 0 embeds, 0 globals using 42768virt/38932res/4828shr/34336data kb, in 80usr/0sys/95real ms. Pass 3: translated to C into "/tmp/stappPMudO/stap_6d8af741ae46dbcad962a6c14afe8f23_994_src.c" using 42768virt/39284res/5148shr/34336data kb, in 0usr/0sys/3real ms. /tmp/ccYoCHW4.s: Assembler messages: /tmp/ccYoCHW4.s:964: Error: selected processor does not support `cpsid i' in ARM mode /tmp/ccYoCHW4.s:1046: Error: selected processor does not support `cpsid i' in ARM mode /tmp/ccYoCHW4.s:1105: Error: selected processor does not support `cpsid i' in ARM mode /tmp/ccYoCHW4.s:1182: Error: selected processor does not support `cpsid i' in ARM mode /tmp/ccYoCHW4.s:2185: Error: selected processor does not support `ldrex r0,[r2]' in ARM mode /tmp/ccYoCHW4.s:2188: Error: selected processor does not support `strexeq ip,r1,[r2]' in ARM mode /tmp/ccYoCHW4.s:2275: Error: selected processor does not support `ldrex r2,[r3]' in ARM mode /tmp/ccYoCHW4.s:2277: Error: selected processor does not support `strex r1,r2,[r3]' in ARM mode /tmp/ccYoCHW4.s:2288: Error: selected processor does not support `ldrex r2,[r3]' in ARM mode /tmp/ccYoCHW4.s:2290: Error: selected processor does not support `strex r1,r2,[r3]' in ARM mode /tmp/ccYoCHW4.s:2333: Error: selected processor does not support `cpsid i' in ARM mode /tmp/ccYoCHW4.s:2382: Error: selected processor does not support `ldrex r3,[r4]' in ARM mode /tmp/ccYoCHW4.s:2384: Error: selected processor does not support `strex r2,r3,[r4]' in ARM mode /tmp/ccYoCHW4.s:2440: Error: selected processor does not support `ldrex r3,[r4]' in ARM mode /tmp/ccYoCHW4.s:2442: Error: selected processor does not support `strex r2,r3,[r4]' in ARM mode /tmp/ccYoCHW4.s:2492: Error: selected processor does not support `cpsid i' in ARM mode /tmp/ccYoCHW4.s:2527: Error: selected processor does not support `isb ' in ARM mode /tmp/ccYoCHW4.s:2540: Error: selected processor does not support `isb ' in ARM mode /tmp/ccYoCHW4.s:2561: Error: selected processor does not support `ldrex r3,[r5]' in ARM mode /tmp/ccYoCHW4.s:2563: Error: selected processor does not support `strex r2,r3,[r5]' in ARM mode /tmp/ccYoCHW4.s:2612: Error: selected processor does not support `ldrex r1,[r2]' in ARM mode /tmp/ccYoCHW4.s:2614: Error: selected processor does not support `strex r0,r1,[r2]' in ARM mode /tmp/ccYoCHW4.s:2680: Error: selected processor does not support `ldrex r1,[r2]' in ARM mode /tmp/ccYoCHW4.s:2682: Error: selected processor does not support `strex r0,r1,[r2]' in ARM mode /tmp/ccYoCHW4.s:2694: Error: selected processor does not support `ldrex r1,[r2]' in ARM mode /tmp/ccYoCHW4.s:2696: Error: selected processor does not support `strex r0,r1,[r2]' in ARM mode /tmp/ccYoCHW4.s:3200: Error: selected processor does not support `dsb nsh' in ARM mode /tmp/ccYoCHW4.s:3203: Error: selected processor does not support `isb ' in ARM mode /tmp/ccYoCHW4.s:3237: Error: selected processor does not support `isb ' in ARM mode /tmp/ccYoCHW4.s:3249: Error: selected processor does not support `isb ' in ARM mode /tmp/ccYoCHW4.s:3264: Error: selected processor does not support `dsb nsh' in ARM mode /tmp/ccYoCHW4.s:3267: Error: selected processor does not support `isb ' in ARM mode /tmp/ccYoCHW4.s:3324: Error: selected processor does not support `dsb nsh' in ARM mode /tmp/ccYoCHW4.s:3327: Error: selected processor does not support `isb ' in ARM mode /tmp/ccYoCHW4.s:3362: Error: selected processor does not support `isb ' in ARM mode /tmp/ccYoCHW4.s:3374: Error: selected processor does not support `isb ' in ARM mode /tmp/ccYoCHW4.s:3391: Error: selected processor does not support `dsb nsh' in ARM mode /tmp/ccYoCHW4.s:3394: Error: selected processor does not support `isb ' in ARM mode /tmp/ccYoCHW4.s:3586: Error: selected processor does not support `cpsid i' in ARM mode /tmp/ccYoCHW4.s:3655: Error: selected processor does not support `ldrex r3,[r6]' in ARM mode /tmp/ccYoCHW4.s:3657: Error: selected processor does not support `strex r2,r3,[r6]' in ARM mode /tmp/ccYoCHW4.s:3756: Error: selected processor does not support `ldrex r1,[r2]' in ARM mode /tmp/ccYoCHW4.s:3758: Error: selected processor does not support `strex r0,r1,[r2]' in ARM mode /tmp/ccYoCHW4.s:4085: Error: selected processor does not support `cpsid i' in ARM mode /tmp/ccYoCHW4.s:4139: Error: selected processor does not support `cpsid i' in ARM mode /tmp/ccYoCHW4.s:4181: Error: selected processor does not support `ldrex r3,[r5]' in ARM mode /tmp/ccYoCHW4.s:4183: Error: selected processor does not support `strex r2,r3,[r5]' in ARM mode /tmp/ccYoCHW4.s:4251: Error: selected processor does not support `ldrex r3,[r5]' in ARM mode /tmp/ccYoCHW4.s:4253: Error: selected processor does not support `strex r2,r3,[r5]' in ARM mode /tmp/ccYoCHW4.s:4340: Error: selected processor does not support `cpsid i' in ARM mode /tmp/ccYoCHW4.s:4377: Error: selected processor does not support `ldrex r3,[r4]' in ARM mode /tmp/ccYoCHW4.s:4379: Error: selected processor does not support `strex r2,r3,[r4]' in ARM mode /tmp/ccYoCHW4.s:5174: Error: selected processor does not support `dsb nsh' in ARM mode /tmp/ccYoCHW4.s:5177: Error: selected processor does not support `isb ' in ARM mode /tmp/ccYoCHW4.s:5191: Error: selected processor does not support `dsb nsh' in ARM mode /tmp/ccYoCHW4.s:5194: Error: selected processor does not support `isb ' in ARM mode /tmp/ccYoCHW4.s:5342: Error: selected processor does not support `ldrex r2,[r3]' in ARM mode /tmp/ccYoCHW4.s:5344: Error: selected processor does not support `strex r1,r2,[r3]' in ARM mode /tmp/ccYoCHW4.s:5357: Error: selected processor does not support `cpsid i' in ARM mode /tmp/ccYoCHW4.s:5387: Error: selected processor does not support `ldrex r3,[r4]' in ARM mode /tmp/ccYoCHW4.s:5389: Error: selected processor does not support `strex r2,r3,[r4]' in ARM mode /tmp/ccYoCHW4.s:5455: Error: selected processor does not support `ldrex r2,[r3]' in ARM mode /tmp/ccYoCHW4.s:5457: Error: selected processor does not support `strex r1,r2,[r3]' in ARM mode /tmp/ccYoCHW4.s:5515: Error: selected processor does not support `ldrex ip,[r2]' in ARM mode /tmp/ccYoCHW4.s:5518: Error: selected processor does not support `strexeq lr,r1,[r2]' in ARM mode /tmp/ccYoCHW4.s:5799: Error: selected processor does not support `isb ' in ARM mode /tmp/ccYoCHW4.s:5811: Error: selected processor does not support `isb ' in ARM mode /tmp/ccYoCHW4.s:5876: Error: selected processor does not support `isb ' in ARM mode /tmp/ccYoCHW4.s:5889: Error: selected processor does not support `isb ' in ARM mode /tmp/ccYoCHW4.s:5920: Error: selected processor does not support `ldrex r2,[r3]' in ARM mode /tmp/ccYoCHW4.s:5923: Error: selected processor does not support `strexeq r0,r1,[r3]' in ARM mode /tmp/ccYoCHW4.s:6030: Error: selected processor does not support `ldrex r2,[r8]' in ARM mode /tmp/ccYoCHW4.s:6033: Error: selected processor does not support `strexeq r5,r3,[r8]' in ARM mode /tmp/ccYoCHW4.s:6094: Error: selected processor does not support `isb ' in ARM mode /tmp/ccYoCHW4.s:6107: Error: selected processor does not support `isb ' in ARM mode /tmp/ccYoCHW4.s:6150: Error: selected processor does not support `isb ' in ARM mode /tmp/ccYoCHW4.s:6164: Error: selected processor does not support `isb ' in ARM mode /tmp/ccYoCHW4.s:6269: Error: selected processor does not support `isb ' in ARM mode /tmp/ccYoCHW4.s:6282: Error: selected processor does not support `isb ' in ARM mode /tmp/ccYoCHW4.s:6342: Error: selected processor does not support `isb ' in ARM mode /tmp/ccYoCHW4.s:6356: Error: selected processor does not support `isb ' in ARM mode /tmp/ccYoCHW4.s:6403: Error: selected processor does not support `isb ' in ARM mode /tmp/ccYoCHW4.s:6416: Error: selected processor does not support `isb ' in ARM mode /tmp/ccYoCHW4.s:6461: Error: selected processor does not support `isb ' in ARM mode /tmp/ccYoCHW4.s:6475: Error: selected processor does not support `isb ' in ARM mode /tmp/ccYoCHW4.s:6519: Error: selected processor does not support `ldrex r8,[r2]' in ARM mode /tmp/ccYoCHW4.s:6522: Error: selected processor does not support `strexeq r1,r3,[r2]' in ARM mode make[1]: *** [scripts/Makefile.build:276: /tmp/stappPMudO/stap_6d8af741ae46dbcad962a6c14afe8f23_994_src.o] Error 1 make: *** [Makefile:1553: _module_/tmp/stappPMudO] Error 2 WARNING: kbuild exited with status: 2 Pass 4: compiled C into "stap_6d8af741ae46dbcad962a6c14afe8f23_994.ko" in 145300usr/14370sys/163480real ms. Pass 4: compilation failed. [man error::pass4] 83360 16 richard.purdie 2019-03-28 15:26:36 +0000 Hi Yi, Could you find the arm kernel Makefile that this comes from and see which options are there? kernel/arch/arm/Makefile should have arch-$(CONFIG_CPU_32v7) =-D__LINUX_ARM_ARCH__=7 $(call cc-option,-march=armv7-a,-march=armv5t -Wa$(comma)-march=armv7-a) replaced with: arch-$(CONFIG_CPU_32v7) =-D__LINUX_ARM_ARCH__=7 $(call cc-option,-march=armv7-a -msoft-float,-march=armv5t -Wa$(comma)-march=armv7-a) so I'm confused as to why that didn't happen? Cheers, Richard 83367 17 4454 yi.zhao 2019-03-29 00:19:01 +0000 Created attachment 4454 Makefile 83368 18 yi.zhao 2019-03-29 00:21:37 +0000 (In reply to comment #16) > Hi Yi, > > Could you find the arm kernel Makefile that this comes from and see which > options are there? > > kernel/arch/arm/Makefile > > should have > > arch-$(CONFIG_CPU_32v7) =-D__LINUX_ARM_ARCH__=7 $(call > cc-option,-march=armv7-a,-march=armv5t -Wa$(comma)-march=armv7-a) > > replaced with: > > arch-$(CONFIG_CPU_32v7) =-D__LINUX_ARM_ARCH__=7 $(call > cc-option,-march=armv7-a -msoft-float,-march=armv5t > -Wa$(comma)-march=armv7-a) Here it the line 66 - 67 in Makefile: arch-$(CONFIG_CPU_32v7M) =-D__LINUX_ARM_ARCH__=7 -march=armv7-m -Wa,-march=armv7-m arch-$(CONFIG_CPU_32v7) =-D__LINUX_ARM_ARCH__=7 $(call cc-option,-march=armv7-a,-march=armv5t -Wa$(comma)-march=armv7-a) I have attached the full Makefile. > > so I'm confused as to why that didn't happen? > > Cheers, > > Richard 83391 19 yi.zhao 2019-04-01 07:47:36 +0000 After replaced with the following line in kernel/arch/arm/Makefile manually: arch-$(CONFIG_CPU_32v7) =-D__LINUX_ARM_ARCH__=7 $(call cc-option,-march=armv7-a -msoft-float,-march=armv5t -Wa$(comma)-march=armv7-a) This case can pass: RESULTS - stap.StapTest.test_stap - Testcase 1652: PASSED (180.91s) 83392 20 richard.purdie 2019-04-01 13:31:28 +0000 I think I understand the problem, the SRCREV wasn't bumped for beaglebone-yocto. Kevin/Bruce? 83405 21 kexin.hao 2019-04-02 08:24:37 +0000 I just sent a patch to bump the kernel for the yocto BSPs. 83454 22 richard.purdie 2019-04-04 22:12:55 +0000 Thanks Kevin! This means this should now really be fixed in http://git.yoctoproject.org/cgit.cgi/poky/commit/?id=ab05f409bef45a756ee4d1034f33d6985fec9f93 4423 2019-01-29 07:02:31 +0000 2019-01-29 07:02:31 +0000 hello.stp hello.stp application/octet-stream 41 yi.zhao cHJvYmUgb25lc2hvdCB7IHByaW50bG4oImhlbGxvIHdvcmxkIikgfQo= 4424 2019-01-29 07:03:10 +0000 2019-01-29 07:03:10 +0000 stap.log stap.log text/x-log 7690 yi.zhao V0FSTklORzogS2VybmVsIGZ1bmN0aW9uIHN5bWJvbCB0YWJsZSBtaXNzaW5nIFttYW4gd2Fybmlu Zzo6c3ltYm9sc10KUGFzcyAxOiBwYXJzZWQgdXNlciBzY3JpcHQgYW5kIDQ1NSBsaWJyYXJ5IHNj cmlwdHMgdXNpbmcgNDIyNDB2aXJ0LzM4MDEycmVzLzQ0MjBzaHIvMzM4NDRkYXRhIGtiLCBpbiAy NzYwdXNyLzMyMHN5cy8zNjUwcmVhbCBtcy4KUGFzcyAyOiBhbmFseXplZCBzY3JpcHQ6IDEgcHJv YmUsIDEgZnVuY3Rpb24sIDAgZW1iZWRzLCAwIGdsb2JhbHMgdXNpbmcgNDI5MDB2aXJ0LzM5MDY0 cmVzLzQ3OTZzaHIvMzQ1MDRkYXRhIGtiLCBpbiA4MHVzci8wc3lzLzk0cmVhbCBtcy4KUGFzcyAz OiB0cmFuc2xhdGVkIHRvIEMgaW50byAiL3RtcC9zdGFwUExaZlZ3L3N0YXBfYjk2OTI1ZjRmYWE3 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