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[Bug tapsets/13480] ARM missing syscall.sigaltstack
- From: "mjw at redhat dot com" <sourceware-bugzilla at sourceware dot org>
- To: systemtap at sourceware dot org
- Date: Sat, 17 Dec 2011 01:07:58 +0000
- Subject: [Bug tapsets/13480] ARM missing syscall.sigaltstack
- Auto-submitted: auto-generated
- References: <bug-13480-6586@http.sourceware.org/bugzilla/>
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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