On 09/10/2013 05:35 PM, Dave Allured - NOAA Affiliate wrote: >> On 09/10/2013 01:21 AM, Dave Allured - NOAA Affiliate wrote: >>> Hello, I am trying to create a dynamic library for >>> x86_64-apple-darwin12 (Mac OS) with gcc 4.8.1. My source code >>> includes some simple functions that I think are being identified as >>> leaf functions. This works fine when compiling to a static library. >>> >>> However, when compiling to dynamic library (-dynamiclib etc.), seg >>> fault results immediately on call from one of these leaf-like >>> functions to another. GDB tells me that the stack becomes misaligned >>> in the calling function, and the actual seg fault happens within a >>> dynamic loader stub function. The simplified message from GDB is: >>> >>> misaligned_stack_error_entering_dyld_stub_binder >>> > On Tue, Sep 10, 2013 at 3:42 AM, Andrew Haley <aph@xxxxxxxxxx> wrote: >> What is the faulting instruction? >> >> x/i $pc > > movdqa, an SSE instruction that requires 16-byte alignment. This is > about a dozen instructions within the dynamic loader. OK, that makes sense. Now, a leaf function cannot call a function: so, what is the assembly code of the "leaf-like" function makinf th ecall? Andrew.
