File glibc-2.5-s390-makecontext.diff of Package glibc

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File glibc-2.5-s390-makecontext.diff of Package glibc

2006-09-20  Martin Schwidefsky  <schwidefsky@de.ibm.com>

* sysdeps/unix/sysv/linux/s390/s390-32/makecontext.c (__makecontext):
	Cast sp to unsigned long to avoid compiler warning.
	(__makecontext): Use __makecontext_ret function instead of a
	trampoline on the stack.
	(__makecontext_ret): New function.
	* sysdeps/unix/sysv/linux/s390/s390-64/makecontext.c: Likewise.

diff -urpN libc/sysdeps/unix/sysv/linux/s390/s390-32/makecontext.c libc-s390/sysdeps/unix/sysv/linux/s390/s390-32/makecontext.c
--- sysdeps/unix/sysv/linux/s390/s390-32/makecontext.c	2001-07-06 06:56:19.000000000 +0200
+++ sysdeps/unix/sysv/linux/s390/s390-32/makecontext.c	2006-08-25 14:38:22.000000000 +0200
@@ -37,8 +37,6 @@
                +-----------------------+
              n | overflow parameters   | 96
                +-----------------------+
-             8 | trampoline            | 96+n
-               +-----------------------+
    The registers are set up like this:
      %r2-%r6: parameters 1 to 5
      %r7    : (*func) pointer
@@ -55,18 +53,16 @@
 void
 __makecontext (ucontext_t *ucp, void (*func) (void), int argc, ...)
 {
+  extern void __makecontext_ret (void);
   unsigned long *sp;
   va_list ap;
   int i;
 
-  sp = (long *) (((long) ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size) & -8L);
-
-  /* Setup the trampoline.  */
-  *--sp = 0x07f90000;
-  *--sp = 0x0de71828;
+  sp = (unsigned long *) (((unsigned long) ucp->uc_stack.ss_sp
+			   + ucp->uc_stack.ss_size) & -8L);
 
   /* Set the return address to trampoline.  */
-  ucp->uc_mcontext.gregs[14] = (long) sp;
+  ucp->uc_mcontext.gregs[14] = (long) __makecontext_ret;
 
   /* Set register parameters.  */
   va_start (ap, argc);
@@ -98,4 +94,12 @@ __makecontext (ucontext_t *ucp, void (*f
   ucp->uc_mcontext.gregs[15] = (long) sp;
 }
 
+asm(".text\n"
+    ".type __makecontext_ret,@function\n"
+    "__makecontext_ret:\n"
+    "      basr  %r14,%r7\n"
+    "      lr    %r2,%r8\n"
+    "      br    %r9\n"
+    ".size __makecontext_ret, .-__makecontext_ret");
+
 weak_alias (__makecontext, makecontext)
diff -urpN libc/sysdeps/unix/sysv/linux/s390/s390-64/makecontext.c libc-s390/sysdeps/unix/sysv/linux/s390/s390-64/makecontext.c
--- sysdeps/unix/sysv/linux/s390/s390-64/makecontext.c	2001-07-06 06:56:20.000000000 +0200
+++ sysdeps/unix/sysv/linux/s390/s390-64/makecontext.c	2006-08-25 14:38:27.000000000 +0200
@@ -37,8 +37,6 @@
                +-----------------------+
              n | overflow parameters   | 160
                +-----------------------+
-             8 | trampoline            | 160+n
-               +-----------------------+
    The registers are set up like this:
      %r2-%r6: parameters 1 to 5
      %r7    : (*func) pointer
@@ -55,17 +53,16 @@
 void
 __makecontext (ucontext_t *ucp, void (*func) (void), int argc, ...)
 {
+  extern void __makecontext_ret (void);
   unsigned long *sp;
   va_list ap;
   int i;
 
-  sp = (long *) (((long) ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size) & -8L);
-
-  /* Setup the trampoline.  */
-  *--sp = 0x0de7b904002807f9;
+  sp = (unsigned long *) (((unsigned long) ucp->uc_stack.ss_sp
+			   + ucp->uc_stack.ss_size) & -8L);
 
   /* Set the return address to trampoline.  */
-  ucp->uc_mcontext.gregs[14] = (long) sp;
+  ucp->uc_mcontext.gregs[14] = (long) __makecontext_ret;
 
   /* Set register parameters.  */
   va_start (ap, argc);
@@ -97,4 +94,12 @@ __makecontext (ucontext_t *ucp, void (*f
   ucp->uc_mcontext.gregs[15] = (long) sp;
 }
 
+asm(".text\n"
+    ".type __makecontext_ret,@function\n"
+    "__makecontext_ret:\n"
+    "      basr  %r14,%r7\n"
+    "      lgr   %r2,%r8\n"
+    "      br    %r9\n"
+    ".size __makecontext_ret, .-__makecontext_ret");
+
 weak_alias (__makecontext, makecontext)

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File glibc-2.5-s390-makecontext.diff of Package glibc

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