From: Joseph Myers <joseph@codesourcery.com>
Date: Wed, 5 Aug 2009 21:02:50 +0000 (+0000)
Subject: Signal stack support for MIPS ____longjmp_chk.
X-Git-Tag: upstream/2.30~10627^2~600
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=c67273d5b28317c87d2e9ee636ead6d71635e0e5;p=external%2Fglibc.git

Signal stack support for MIPS ____longjmp_chk.

	* sysdeps/mips/____longjmp_chk.c: Remove.  Replaced by....
	* sysdeps/unix/sysv/linux/mips/____longjmp_chk.c: This.  New file.
	* sysdeps/mips/__longjmp.c (__longjmp): Use explicit register
	variable for env.  Use expansion of CHECK_SP macro for check.
	* sysdeps/mips/mips64/__longjmp.c (__Longjmp): Likewise.
---

diff --git a/ChangeLog.mips b/ChangeLog.mips
index 9afd961..5ba4297 100644
--- a/ChangeLog.mips
+++ b/ChangeLog.mips
@@ -1,3 +1,11 @@
+2009-08-05  Joseph Myers  <joseph@codesourcery.com>
+
+	* sysdeps/mips/____longjmp_chk.c: Remove.  Replaced by....
+	* sysdeps/unix/sysv/linux/mips/____longjmp_chk.c: This.  New file.
+	* sysdeps/mips/__longjmp.c (__longjmp): Use explicit register
+	variable for env.  Use expansion of CHECK_SP macro for check.
+	* sysdeps/mips/mips64/__longjmp.c (__Longjmp): Likewise.
+
 2009-08-03  Joseph Myers  <joseph@codesourcery.com>
 
 	* sysdeps/unix/sysv/linux/mips/mips32/accept4.c,
diff --git a/sysdeps/mips/__longjmp.c b/sysdeps/mips/__longjmp.c
index 340485d..2a91771 100644
--- a/sysdeps/mips/__longjmp.c
+++ b/sysdeps/mips/__longjmp.c
@@ -25,19 +25,19 @@
 #endif
 
 void
-__longjmp (env, val_arg)
-     __jmp_buf env;
+__longjmp (env_arg, val_arg)
+     __jmp_buf env_arg;
      int val_arg;
 {
   /* gcc 1.39.19 miscompiled the longjmp routine (as it did setjmp before
      the hack around it); force it to use $a1 for the longjmp value.
      Without this it saves $a1 in a register which gets clobbered
      along the way.  */
+  register struct __jmp_buf_internal_tag *env asm ("a0");
   register int val asm ("a1");
 #ifdef CHECK_SP
   register long sp asm ("$29");
-  if ((long) (env[0].__sp) < sp)
-    __fortify_fail ("longjmp causes uninitialized stack frame");
+  CHECK_SP (env[0].__sp, sp, long);
 #endif
 
 #ifdef __mips_hard_float
diff --git a/sysdeps/mips/mips64/__longjmp.c b/sysdeps/mips/mips64/__longjmp.c
index d7e36ff..99aac01 100644
--- a/sysdeps/mips/mips64/__longjmp.c
+++ b/sysdeps/mips/mips64/__longjmp.c
@@ -27,19 +27,19 @@
 #endif
 
 void
-__longjmp (env, val_arg)
-     __jmp_buf env;
+__longjmp (env_arg, val_arg)
+     __jmp_buf env_arg;
      int val_arg;
 {
   /* gcc 1.39.19 miscompiled the longjmp routine (as it did setjmp before
      the hack around it); force it to use $a1 for the longjmp value.
      Without this it saves $a1 in a register which gets clobbered
      along the way.  */
+  register struct __jmp_buf_internal_tag *env asm ("a0");
   register int val asm ("a1");
 #ifdef CHECK_SP
   register long long sp asm ("$29");
-  if ((long long) (env[0].__sp) < sp)
-    __fortify_fail ("longjmp causes uninitialized stack frame");
+  CHECK_SP (env[0].__sp, sp, long long);
 #endif
 
 #ifdef __mips_hard_float
diff --git a/sysdeps/mips/____longjmp_chk.c b/sysdeps/unix/sysv/linux/mips/____longjmp_chk.c
similarity index 55%
rename from sysdeps/mips/____longjmp_chk.c
rename to sysdeps/unix/sysv/linux/mips/____longjmp_chk.c
index a46ed15..9db339c 100644
--- a/sysdeps/mips/____longjmp_chk.c
+++ b/sysdeps/unix/sysv/linux/mips/____longjmp_chk.c
@@ -16,7 +16,27 @@
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA.  */
 
+#include <signal.h>
 #include <stdio.h>
 #define __longjmp ____longjmp_chk
-#define CHECK_SP
+#define CHECK_SP(saved_sp, cur_sp, sp_type)				\
+  do {									\
+    sp_type sp_saved = (sp_type) (saved_sp);				\
+    if (sp_saved < (cur_sp))						\
+      {									\
+	struct __jmp_buf_internal_tag *env_save = env_arg;		\
+	int val_save = val_arg;						\
+	stack_t ss;							\
+	int ret = __sigaltstack (NULL, &ss);				\
+	if (ret == 0							\
+	    && (!(ss.ss_flags & SS_ONSTACK)				\
+		|| ((unsigned sp_type) ((sp_type) ss.ss_sp		\
+					+ (sp_type) ss.ss_size		\
+					- sp_saved)			\
+		    < ss.ss_size)))					\
+	  __fortify_fail ("longjmp causes uninitialized stack frame");	\
+	asm volatile ("move %0, %1" : "=r" (env) : "r" (env_save));	\
+	asm volatile ("move %0, %1" : "=r" (val) : "r" (val_save));	\
+      }									\
+  } while (0)
 #include <__longjmp.c>