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authorUlrich Drepper <drepper@redhat.com>2009-01-29 00:17:57 +0000
committerUlrich Drepper <drepper@redhat.com>2009-01-29 00:17:57 +0000
commitfd537e535fe9f4d2b0286cf7a7242ef1e6775e67 (patch)
tree2eed5f293901fe55fc170dd02dd120f92acf1ece /sysdeps
parent31d322a214386b20bb82c06d0c436bd0f0e80236 (diff)
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[BZ #9750]
	* nscd/mem.c (gc): Use alloca_count to get the real stack usage.
	* include/alloca.h (alloca_account): Define.
	* sysdeps/x86_64/stackinfo.h (stackinfo_get_sp): Define.
	(stackinfo_sub_sp): Define.
Diffstat (limited to 'sysdeps')
-rw-r--r--sysdeps/x86_64/stackinfo.h12
1 files changed, 11 insertions, 1 deletions
diff --git a/sysdeps/x86_64/stackinfo.h b/sysdeps/x86_64/stackinfo.h
index 60668d10b1..b11849d9ab 100644
--- a/sysdeps/x86_64/stackinfo.h
+++ b/sysdeps/x86_64/stackinfo.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 2001 Free Software Foundation, Inc.
+/* Copyright (C) 2001, 2009 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -25,4 +25,14 @@
 /* On x86_64 the stack grows down.  */
 #define _STACK_GROWS_DOWN	1
 
+/* Access to the stack pointer.  The macros are used in alloca_account
+   for which they need to act as barriers as well, hence the additional
+   (unnecessary) parameters.  */
+#define stackinfo_get_sp() \
+  ({ void *p__; asm volatile ("mov %%rsp, %0" : "=r" (p__)); p__; })
+#define stackinfo_sub_sp(ptr) \
+  ({ ptrdiff_t d__;						\
+     asm volatile ("sub %%rsp, %0" : "=r" (d__) : "0" (ptr));	\
+     d__; })
+
 #endif	/* stackinfo.h */