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    SubjectRe: [GIT PULL] x86/asm changes for v2.6.37
    On Thu, Oct 21, 2010 at 6:21 AM, Ingo Molnar <> wrote:
    > Jan Beulich (1):
    >      i386: Make kernel_execve() suitable for stack unwinding
    >        long __res;
    > -       asm volatile ("push %%ebx ; movl %2,%%ebx ; int $0x80 ; pop %%ebx"
    > +       asm volatile ("int $0x80"
    >        : "=a" (__res)
    > -       : "0" (__NR_execve), "ri" (filename), "c" (argv), "d" (envp) : "memory");
    > +       : "0" (__NR_execve), "b" (filename), "c" (argv), "d" (envp) : "memory");
    >        return __res;
    >  }

    I pulled this, but there's a reason we used to do it that way - gcc
    has had bugs with inline asm changing %ebx due to some bad interaction
    with using it as the GOT base register for position-independent code
    or something.

    So I hope those are all solved, and I guess we use -fPIC only for some
    early boot code. But in case this is ever used in some environment
    that is PIC (the vsyscall page?) we need to worry about gcc

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      Last update: 2010-10-21 22:19    [W:0.020 / U:41.640 seconds]
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