From: Bart Van Assche <bvanassche@acm.org>
Date: Thu, 2 Sep 2010 14:38:38 +0000 (+0000)
Subject: Added functions for querying the properties of the alternate stack.
X-Git-Tag: svn/VALGRIND_3_6_0~133
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0bf86ce7b99b7754baff212f2d9a88ab07a7e6e7;p=thirdparty%2Fvalgrind.git

Added functions for querying the properties of the alternate stack.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@11324
---

diff --git a/coregrind/m_machine.c b/coregrind/m_machine.c
index 250a21c7ed..7a7e1e1c17 100644
--- a/coregrind/m_machine.c
+++ b/coregrind/m_machine.c
@@ -310,6 +310,20 @@ SizeT VG_(thread_get_stack_size)(ThreadId tid)
    return VG_(threads)[tid].client_stack_szB;
 }
 
+Addr VG_(thread_get_altstack_min)(ThreadId tid)
+{
+   vg_assert(0 <= tid && tid < VG_N_THREADS && tid != VG_INVALID_THREADID);
+   vg_assert(VG_(threads)[tid].status != VgTs_Empty);
+   return (Addr)VG_(threads)[tid].altstack.ss_sp;
+}
+
+SizeT VG_(thread_get_altstack_size)(ThreadId tid)
+{
+   vg_assert(0 <= tid && tid < VG_N_THREADS && tid != VG_INVALID_THREADID);
+   vg_assert(VG_(threads)[tid].status != VgTs_Empty);
+   return VG_(threads)[tid].altstack.ss_size;
+}
+
 //-------------------------------------------------------------
 /* Details about the capabilities of the underlying (host) CPU.  These
    details are acquired by (1) enquiring with the CPU at startup, or
diff --git a/include/pub_tool_machine.h b/include/pub_tool_machine.h
index c9d77dd726..5d89c708d1 100644
--- a/include/pub_tool_machine.h
+++ b/include/pub_tool_machine.h
@@ -148,6 +148,14 @@ extern Addr VG_(thread_get_stack_max) ( ThreadId tid );
 // Returns how many bytes have been allocated for the stack of the given thread
 extern Addr VG_(thread_get_stack_size) ( ThreadId tid );
 
+// Returns the bottommost address of the alternate signal stack.
+// See also the man page of sigaltstack().
+extern Addr VG_(thread_get_altstack_min) ( ThreadId tid );
+
+// Returns how many bytes have been allocated for the alternate signal stack.
+// See also the man page of sigaltstack().
+extern SizeT VG_(thread_get_altstack_size) ( ThreadId tid );
+
 // Given a pointer to a function as obtained by "& functionname" in C,
 // produce a pointer to the actual entry point for the function.  For
 // most platforms it's the identity function.  Unfortunately, on