kernel-packages team mailing list archive

[Andy Whitcroft <apw@xxxxxxxxxxxxx>]

Ok.  So this is actually a bad piece of assembly triggering, a piece
deliberatly placed in the code to catch the compiler not placing things
in the registers we expected.  Basically we are assuming the ABI
placement.  When mcount (-pg) is enabled, the compiler adds additional
code "inside" the function and all bets are off.  The approved mechanism
is to inform the compiler of your constraints on the variables using the
below form:

int foo (int _arg)
{
    register int arg asm("r0") = _arg;
    [...]
}

** Changed in: linux (Ubuntu)
       Status: Incomplete => In Progress

** Changed in: linux (Ubuntu)
   Importance: Undecided => High

** Changed in: linux (Ubuntu)
     Assignee: (unassigned) => Andy Whitcroft (apw)

** Changed in: linux (Ubuntu)
    Milestone: None => ubuntu-15.01

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https://bugs.launchpad.net/bugs/1414002

Title:
  Assembler messages: Error: .err encountered

Status in linux package in Ubuntu:
  In Progress

Bug description:
  $ gcc -Wp,-MD,arch/arm64/kernel/.psci.o.d  -nostdinc -isystem /usr/lib/gcc/aarch64-linux-gnu/4.9/include -I/usr/src/linux-headers-lbm- -I/home/apw/ubuntu-vivid2/arch/arm64/include -Iarch/arm64/include/generated  -I/home/apw/ubuntu-vivid2/include -Iinclude -I/home/apw/ubuntu-vivid2/arch/arm64/include/uapi -Iarch/arm64/include/generated/uapi -I/home/apw/ubuntu-vivid2/include/uapi -Iinclude/generated/uapi -include /home/apw/ubuntu-vivid2/include/linux/kconfig.h -Iubuntu/include -I/home/apw/ubuntu-vivid2/ubuntu/include  -I/home/apw/ubuntu-vivid2/arch/arm64/kernel -Iarch/arm64/kernel -D__KERNEL__ -mlittle-endian -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -Werror-implicit-function-declaration -Wno-format-security -std=gnu89 -mgeneral-regs-only -fno-delete-null-pointer-checks -O2 --param=allow-store-data-races=0 -Wframe-larger-than=1024 -fstack-protector -Wno-unused-but-set-variable -fno-omit-frame-pointer -fno-optimize-sibling-calls -fno-var-tracking-assignments -g -gdwarf-4 -pg -fno-inline-functions-called-once -Wdeclaration-after-statement -Wno-pointer-sign -fno-strict-overflow -fconserve-stack -Werror=implicit-int -Werror=strict-prototypes -Werror=date-time -DCC_HAVE_ASM_GOTO    -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(psci)"  -D"KBUILD_MODNAME=KBUILD_STR(psci)" -c -o arch/arm64/kernel/.tmp_psci.o /home/apw/ubuntu-vivid2/arch/arm64/kernel/psci.c
  /tmp/ccEayz7S.s: Assembler messages:
  /tmp/ccEayz7S.s:41: Error: .err encountered
  /tmp/ccEayz7S.s:42: Error: .err encountered
  /tmp/ccEayz7S.s:43: Error: .err encountered
  /tmp/ccEayz7S.s:101: Error: .err encountered
  /tmp/ccEayz7S.s:102: Error: .err encountered
  /tmp/ccEayz7S.s:103: Error: .err encountered

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