Florian Krohm e7674cfdbb Add VG_(am_is_bogus_client_stack_pointer)(Addr). ...

The function is used in VG_(client_syscall) to avoid extending the stack
when it is clear that the current value of the stack pointer does not
point into a segment that looks like a stack segment.
See the comments in the code there.
As a side effect of this we can now revert r15018 which increased
the stack size of the alternate stack in memcheck/tests/sigaltstack.c.
The reason is that the belief at the time: "alternate stack is too small"
was not correct. What instead happened was that VG_(client_syscall) called
VG_(extend_stack) without need (the syscall was tgkill) and the new stack
pointer happened to be in a file segment. 
In other words: the current stack pointer was still within the alternate
stack, i.e. the alternate stack was (barely) large enough.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@15034

2015-03-23 17:13:04 +00:00

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