[Bug tapsets/13480] ARM missing syscall.sigaltstack

[mjw at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=13480

--- Comment #2 from Mark Wielaard <mjw at redhat dot com> 2011-12-17 01:07:58 UTC ---
The only entry point visible is do_sigaltstack, which unfortunately is too
generic (it would also catch some calls to sigreturn for example).

The sigaltstack syscall is defined in  as:

CALL(sys_sigaltstack_wrapper)
(which has sycall number 186)

sys_sigaltstack_wrapper comes from linux/arch/arm/kernel/entry-common.S:

sys_sigaltstack_wrapper:
                ldr     r2, [sp, #S_OFF + S_SP]
                b       do_sigaltstack
ENDPROC(sys_sigaltstack_wrapper)

Unfortunately this means no dwarf is generated for this symbol, which makes it
"invisible" to stap (or at least any argument processing will be invisible
unless done by hand).

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