[Short top post of where floatdidf definitions seem to be for TARGET_ARCH=powerpc.]
libcompiler_rt , libc , and libgcc each seem to be places with floatdidf definitions: # grep floatdidf ~/sys_typescripts/typescript_make_powerpcvtsc_nodebug_clang_bootstrap_world-amd64-host-2016-11-26:11:38:36 Building /usr/obj/powerpcvtsc_clang_world/powerpc.powerpc/usr/src/lib/libcompiler_rt/floatdidf.o Building /usr/obj/powerpcvtsc_clang_world/powerpc.powerpc/usr/src/lib/libc/floatdidf.o Building /usr/obj/powerpcvtsc_clang_world/powerpc.powerpc/usr/src/lib/libc/floatdidf.pico Building /usr/obj/powerpcvtsc_clang_world/powerpc.powerpc/usr/src/gnu/lib/libgcc/_floatdidf.pico Building /usr/obj/powerpcvtsc_clang_world/powerpc.powerpc/usr/src/lib/libcompiler_rt/floatdidf.po Building /usr/obj/powerpcvtsc_clang_world/powerpc.powerpc/usr/src/lib/libc/floatdidf.po For .o: just libcompiler_rt and libc For .po: just libcompiler_rt and libc For .pico: just libgcc and libc Only libc is common to all 3 types of files. But the libc copy is not used by fsck_ufs or df. (The larger address routine is from /lib/libc.so.7 and the smaller one from the "local exec file".) I've no clue if this sort of thing is unique to powerpc or not. === Mark Millard markmi at dsl-only.net On 2016-Nov-26, at 4:41 PM, Mark Millard <[email protected]> wrote: > [Summary: Looking around with gdb at fsck_ufs I found two __floatdidf routines > with different code. df has the same.] > > On 2016-Nov-26, at 3:39 PM, Mark Millard <markmi at dsl-only.net> wrote: > >> I updated to head -r309197 (with a work around for -r309144 breaking the >> build). >> >> This was on amd64, then used it to try to cross buildworld using clang 3.9.0 >> for >> TARGET_ARCH=powerpc . The build completed. (I've been using clang 3.8.0 this >> way >> for a long time.) >> >> [The kernel here was cross built via gcc 4.2.1, as has been my normal >> procedure. >> The kernel still has my "red zone for signal delivery" hack that was a >> workaround >> for clang 3.8.0 stack-handling ABI violations.] >> >> Booting, however, had problems because of fsck_ufs getting signal 11 and >> ended up >> initially in single user mode. >> >> Exiting single user did finish the boot. But "df -m" core dumps. (I've not >> explored much else.) >> >> Turns out that both fsck_ufs and "df -m" fail in the same routine for a >> SIGSEGV: >> __floatdidf >> >> >> The details. . . >> >> First the boot and fsck_ufs: >> >>> Copyright (c) 1992-2016 The FreeBSD Project. >>> Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994 >>> The Regents of the University of California. All rights reserved. >>> FreeBSD is a registered trademark of The FreeBSD Foundation. >>> FreeBSD 12.0-CURRENT #9 r309179M: Sat Nov 26 12:53:11 PST 2016 >>> >>> markmi@FreeBSDx64:/usr/obj/powerpcvtsc_clang_gcc421_kernel/powerpc.powerpc/usr/src/sys/GENERICvtsc-NODBG >>> powerpc >>> gcc version 4.2.1 20070831 patched [FreeBSD] >>> cpu0: IBM PowerPC 970MP revision 1.1, 18446744071914.91 MHz >>> cpu0: Features dc000000<PPC32,PPC64,ALTIVEC,FPU,MMU> >>> cpu0: HID0 1511081<DEEPNAP,NAP,DPM,NHR,TBEN,ENATTN> >>> real memory = 2118565888 (2020 MB) >>> avail memory = 2014863360 (1921 MB) >>> FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs >>> . . . >>> Trying to mount root from ufs:/dev/ufs/FBSDG4Srootfs [rw,noatime]... >>> . . . >>> pid 53 (fsck_ufs), uid 0: exited on signal 11 >> >> >> Manually running fsck later gets a segmentation fault core file in >> /var/crash/ >> and I used this too see a point of failure (__floatdidf): >> >>> # fsck / >>> ** /dev/ufs/FBSDG4Srootfs (NO WRITE) >>> ** Last Mounted on / >>> ** Root file system >>> ** Phase 1 - Check Blocks and Sizes >>> INCORRECT BLOCK COUNT I=11538459 (8 should be 0) >>> CORRECT? no >>> >>> ** Phase 2 - Check Pathnames >>> ** Phase 3 - Check Connectivity >>> ** Phase 4 - Check Reference Counts >>> LINK COUNT FILE I=10016041 OWNER=operator MODE=100400 >>> SIZE=4096 MTIME=Nov 26 14:44 2016 COUNT 2 SHOULD BE 1 >>> ADJUST? no >>> >>> LINK COUNT FILE I=10016049 OWNER=operator MODE=100400 >>> SIZE=4096 MTIME=Nov 26 14:55 2016 COUNT 2 SHOULD BE 1 >>> ADJUST? no >>> >>> LINK COUNT FILE I=10016089 OWNER=operator MODE=100400 >>> SIZE=4096 MTIME=Nov 26 15:00 2016 COUNT 2 SHOULD BE 1 >>> ADJUST? no >>> >>> UNREF FILE I=11538459 OWNER=root MODE=100600 >>> SIZE=0 MTIME=Nov 26 15:11 2016 >>> RECONNECT? no >>> >>> >>> CLEAR? no >>> >>> ** Phase 5 - Check Cyl groups >>> FREE BLK COUNT(S) WRONG IN SUPERBLK >>> SALVAGE? no >>> >>> SUMMARY INFORMATION BAD >>> SALVAGE? no >>> >>> BLK(S) MISSING IN BIT MAPS >>> SALVAGE? no >>> >>> fsck: /dev/ufs/FBSDG4Srootfs: Segmentation fault >> >> >>> # gdb fsck_ufs /var/crash/fsck_ufs.1129.core >>> GNU gdb 6.1.1 [FreeBSD] >>> Copyright 2004 Free Software Foundation, Inc. >>> GDB is free software, covered by the GNU General Public License, and you are >>> welcome to change it and/or distribute copies of it under certain >>> conditions. >>> Type "show copying" to see the conditions. >>> There is absolutely no warranty for GDB. Type "show warranty" for details. >>> This GDB was configured as "powerpc-marcel-freebsd"... >>> Core was generated by `fsck_ufs /dev/ufs/FBSDG4Srootfs'. >>> Program terminated with signal 11, Segmentation fault. >>> Reading symbols from /lib/libufs.so.6...Reading symbols from >>> /usr/lib/debug//lib/libufs.so.6.debug...done. >>> done. >>> Loaded symbols for /lib/libufs.so.6 >>> Reading symbols from /lib/libc.so.7...Reading symbols from >>> /usr/lib/debug//lib/libc.so.7.debug...done. >>> done. >>> Loaded symbols for /lib/libc.so.7 >>> Reading symbols from /libexec/ld-elf.so.1...Reading symbols from >>> /usr/lib/debug//libexec/ld-elf.so.1.debug...done. >>> done. >>> Loaded symbols for /libexec/ld-elf.so.1 >>> #0 0x0181b024 in __floatdidf () >>> (gdb) bt >>> #0 0x0181b024 in __floatdidf () >>> #1 0x0180a8e0 in main (argc=<value optimized out>, argv=<value optimized >>> out>) at /usr/src/sbin/fsck_ffs/main.c:519 >>> #2 0x01801664 in _start () >>> #3 0x418303a0 in .text () at >>> /usr/src/libexec/rtld-elf/powerpc/rtld_start.S:112 >> >> main.c's line 519 is part of: >> >>> printf("(%ju frags, %ju blocks, %.1f%% fragmentation)\n", >>> (uintmax_t)n_ffree, (uintmax_t)n_bfree, >>> n_ffree * 100.0 / sblock.fs_dsize); >> >> >> >> As for "df -m" --it failed in __floatdidf as well: >> >>> # gdb df /var/crash/df.1056.core >>> >>> GNU gdb 6.1.1 [FreeBSD] >>> Copyright 2004 Free Software Foundation, Inc. >>> GDB is free software, covered by the GNU General Public License, and you are >>> welcome to change it and/or distribute copies of it under certain >>> conditions. >>> Type "show copying" to see the conditions. >>> There is absolutely no warranty for GDB. Type "show warranty" for details. >>> This GDB was configured as "powerpc-marcel-freebsd"... >>> Core was generated by `df -m'. >>> Program terminated with signal 11, Segmentation fault. >>> Reading symbols from /lib/libxo.so.0...Reading symbols from >>> /usr/lib/debug//lib/libxo.so.0.debug...done. >>> done. >>> Loaded symbols for /lib/libxo.so.0 >>> Reading symbols from /lib/libutil.so.9...Reading symbols from >>> /usr/lib/debug//lib/libutil.so.9.debug...done. >>> done. >>> Loaded symbols for /lib/libutil.so.9 >>> Reading symbols from /lib/libc.so.7...Reading symbols from >>> /usr/lib/debug//lib/libc.so.7.debug...done. >>> done. >>> Loaded symbols for /lib/libc.so.7 >>> Reading symbols from /libexec/ld-elf.so.1...Reading symbols from >>> /usr/lib/debug//libexec/ld-elf.so.1.debug...done. >>> done. >>> Loaded symbols for /libexec/ld-elf.so.1 >>> #0 0x01802a18 in __floatdidf () >>> (gdb) bt >>> #0 0x01802a18 in __floatdidf () >>> #1 0x01802538 in prtstat (sfsp=0x41e24000, mwp=0xffffd930) at >>> /usr/src/bin/df/df.c:503 >>> #2 0x01801df0 in main (argc=<value optimized out>, argv=<value optimized >>> out>) at /usr/src/bin/df/df.c:308 >>> #3 0x01800cdc in _start () >>> #4 0x418153a0 in .text () at >>> /usr/src/libexec/rtld-elf/powerpc/rtld_start.S:112 >> >> df.c's line 503 was part of: >> >>> xo_emit(" {:used-percent/%5.0f}{U:%%}", >>> availblks == 0 ? 100.0 : (double)used / (double)availblks * >>> 100.0); >> >> >> >> Context details: >> >>> # head >>> ~/sys_typescripts/typescript_make_powerpcvtsc_nodebug_clang_bootstrap_world-amd64-host-2016-11-26:11:38:36 >>> >>> Script started on Sat Nov 26 11:38:36 2016 >>> Command: env __MAKE_CONF=/root/src.configs/make.conf SRCCONF=/dev/null >>> SRC_ENV_CONF=/root/src.configs/src.conf.powerpc-clang-bootstrap.amd64-host >>> WITH_META_MODE=yes MAKEOBJDIRPREFIX=/usr/obj/powerpcvtsc_clang_world make >>> -j 5 buildworld >>> --- buildworld --- >> >> . . . >> >> >>> # more ~/src.configs/src.conf.powerpc-clang-bootstrap.amd64-host >>> TO_TYPE=powerpc >>> # >>> KERNCONF=GENERICvtsc-NODBG >>> TARGET=${TO_TYPE} >>> .if ${.MAKE.LEVEL} == 0 >>> TARGET_ARCH=${TO_TYPE} >>> .export TARGET_ARCH >>> .endif >>> # >>> WITH_CROSS_COMPILER= >>> WITHOUT_SYSTEM_COMPILER= >>> # >>> WITH_LIBCPLUSPLUS= >>> WITH_BINUTILS_BOOTSTRAP= >>> WITH_CLANG_BOOTSTRAP= >>> WITH_CLANG= >>> WITH_CLANG_IS_CC= >>> WITH_CLANG_FULL= >>> WITH_CLANG_EXTRAS= >>> # lldb requires missing atomic 8-byte operations for powerpc (non-64) >>> WITHOUT_LLDB= >>> # >>> WITH_BOOT= >>> WITHOUT_LIB32= >>> # >>> WITHOUT_ELFTOOLCHAIN_BOOTSTRAP= >>> WITHOUT_GCC_BOOTSTRAP= >>> WITHOUT_GCC= >>> WITHOUT_GCC_IS_CC= >>> WITHOUT_GNUCXX= >>> # >>> NO_WERROR= >>> #WERROR= >>> MALLOC_PRODUCTION= >>> # >>> WITH_DEBUG_FILES= >> >> >>> # more ~/src.configs/make.conf >>> CFLAGS.gcc+= -v > > Looking around in gdb there seem to be two __floatdidf routines with > differing code. > > First showing the one that was used and failed: > > (gdb) x/50i 0x0181afc0 > . . . > 0x181afcc <__floatdidf>: mflr r0 > 0x181afd0 <__floatdidf+4>: stw r0,4(r1) > 0x181afd4 <__floatdidf+8>: stwu r1,-32(r1) > 0x181afd8 <__floatdidf+12>: stw r31,28(r1) > 0x181afdc <__floatdidf+16>: stw r30,24(r1) > 0x181afe0 <__floatdidf+20>: bl 0x182e96c <.got+20> > 0x181afe4 <__floatdidf+24>: mr r31,r1 > 0x181afe8 <__floatdidf+28>: xoris r3,r3,32768 > 0x181afec <__floatdidf+32>: lis r5,17200 > 0x181aff0 <__floatdidf+36>: mflr r30 > 0x181aff4 <__floatdidf+40>: stw r3,12(r31) > 0x181aff8 <__floatdidf+44>: stw r5,8(r31) > 0x181affc <__floatdidf+48>: lwz r3,-16(r30) > 0x181b000 <__floatdidf+52>: lwz r6,-20(r30) > 0x181b004 <__floatdidf+56>: lfd f1,8(r31) > 0x181b008 <__floatdidf+60>: stw r4,20(r31) > 0x181b00c <__floatdidf+64>: stw r5,16(r31) > 0x181b010 <__floatdidf+68>: lfd f13,16(r31) > 0x181b014 <__floatdidf+72>: lwz r0,36(r1) > 0x181b018 <__floatdidf+76>: lwz r31,28(r1) > 0x181b01c <__floatdidf+80>: lwz r30,24(r1) > 0x181b020 <__floatdidf+84>: lfs f2,0(r3) > 0x181b024 <__floatdidf+88>: lwz r3,-12(r30) > 0x181b028 <__floatdidf+92>: lfs f0,0(r6) > 0x181b02c <__floatdidf+96>: lfs f12,0(r3) > 0x181b030 <__floatdidf+100>: fsub f0,f1,f0 > 0x181b034 <__floatdidf+104>: fmul f0,f0,f2 > 0x181b038 <__floatdidf+108>: fadd f0,f0,f12 > 0x181b03c <__floatdidf+112>: fadd f1,f13,f0 > 0x181b040 <__floatdidf+116>: addi r1,r1,32 > 0x181b044 <__floatdidf+120>: mtlr r0 > 0x181b048 <__floatdidf+124>: blr > . . . > > Then showing the one that was not used that I found: > > (gdb) disass __floatdidf > Dump of assembler code for function __floatdidf: > 0x4199fc8c <__floatdidf+0>: mflr r0 > 0x4199fc90 <__floatdidf+4>: stw r0,4(r1) > 0x4199fc94 <__floatdidf+8>: stwu r1,-32(r1) > 0x4199fc98 <__floatdidf+12>: stw r31,28(r1) > 0x4199fc9c <__floatdidf+16>: stw r30,24(r1) > 0x4199fca0 <__floatdidf+20>: mr r31,r1 > 0x4199fca4 <__floatdidf+24>: srawi r5,r3,31 > 0x4199fca8 <__floatdidf+28>: bl 0x41a0a288 <.got+14428> > 0x4199fcac <__floatdidf+32>: cmpwi r3,0 > 0x4199fcb0 <__floatdidf+36>: addc r6,r4,r5 > 0x4199fcb4 <__floatdidf+40>: adde r6,r3,r5 > 0x4199fcb8 <__floatdidf+44>: lis r3,17200 > 0x4199fcbc <__floatdidf+48>: xor r5,r6,r5 > 0x4199fcc0 <__floatdidf+52>: mflr r30 > 0x4199fcc4 <__floatdidf+56>: bge- 0x4199fccc <__floatdidf+64> > 0x4199fcc8 <__floatdidf+60>: neg r4,r4 > 0x4199fccc <__floatdidf+64>: lwz r12,-3124(r30) > 0x4199fcd0 <__floatdidf+68>: stw r5,20(r31) > 0x4199fcd4 <__floatdidf+72>: stw r4,12(r31) > 0x4199fcd8 <__floatdidf+76>: lwz r4,-3120(r30) > 0x4199fcdc <__floatdidf+80>: stw r3,16(r31) > 0x4199fce0 <__floatdidf+84>: stw r3,8(r31) > 0x4199fce4 <__floatdidf+88>: lfd f1,16(r31) > 0x4199fce8 <__floatdidf+92>: lfd f3,8(r31) > 0x4199fcec <__floatdidf+96>: lfs f0,0(r12) > 0x4199fcf0 <__floatdidf+100>: lfs f2,0(r4) > 0x4199fcf4 <__floatdidf+104>: fsub f1,f1,f0 > 0x4199fcf8 <__floatdidf+108>: fsub f0,f3,f0 > 0x4199fcfc <__floatdidf+112>: fmul f1,f1,f2 > 0x4199fd00 <__floatdidf+116>: fadd f1,f0,f1 > 0x4199fd04 <__floatdidf+120>: bge- 0x4199fd0c <__floatdidf+128> > 0x4199fd08 <__floatdidf+124>: fneg f1,f1 > 0x4199fd0c <__floatdidf+128>: lwz r0,36(r1) > 0x4199fd10 <__floatdidf+132>: lwz r31,28(r1) > 0x4199fd14 <__floatdidf+136>: lwz r30,24(r1) > 0x4199fd18 <__floatdidf+140>: addi r1,r1,32 > 0x4199fd1c <__floatdidf+144>: mtlr r0 > 0x4199fd20 <__floatdidf+148>: blr > End of assembler dump. > > === > Mark Millard > markmi at dsl-only.net _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-toolchain To unsubscribe, send any mail to "[email protected]"
