Update.

2001-03-16  David Mosberger  <davidm@hpl.hp.com>

	* sysdeps/unix/sysv/linux/ia64/bits/sigcontext.h (struct sigcontext):
	Drop hack that was needed for 2.1.1 kernel headers.

	* sysdeps/unix/sysv/linux/ia64/ucontext_i.h: New file.

	* sysdeps/unix/sysv/linux/ia64/sys/ucontext.h: Rewrite to make it
	overlay with kernel's "struct sigcontext".

	* sysdeps/unix/sysv/linux/ia64/Makefile (sysdep_headers): Add
	sys/rse.h for "misc" subdir.
	(sysdep_routines): Add __start_context for "stdlib" subdir.

	* sysdeps/unix/sysv/linux/ia64/sys/rse.h: New file (based on
	kernel file of the same name).

	* stdlib/Makefile (tests): Add tst-setcontext.
	* stdlib/tst-setcontext.c: New file (based on a sample program by
	Uli Drepper).

	* sysdeps/unix/sysv/linux/ia64/setcontext.S: New file.
	* sysdeps/unix/sysv/linux/ia64/getcontext.S: New file.
	* sysdeps/unix/sysv/linux/ia64/__start_context.S: New file.
	* sysdeps/unix/sysv/linux/ia64/makecontext.c: New file.

	* sysdeps/unix/sysv/linux/ia64/__longjmp.S (__longjmp): Use extr.u
	instead of shift & and.

1 files changed, 33 insertions, 41 deletions

diff --git a/sysdeps/unix/sysv/linux/ia64/sys/ucontext.h b/sysdeps/unix/sysv/linux/ia64/sys/ucontext.h
index babb41de4b..8ca52209ba 100644
--- a/sysdeps/unix/sysv/linux/ia64/sys/ucontext.h
+++ b/sysdeps/unix/sysv/linux/ia64/sys/ucontext.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 1998, 2000 Free Software Foundation, Inc.
+/* Copyright (C) 1998, 2000, 2001 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
@@ -24,48 +24,40 @@
 
 #include <bits/sigstack.h>
 
-typedef struct
-{
-  /* Place-holder for interrupt collection state.  */
-  long int ics_placeholder[15];
-  unsigned long	int ar_fpsr;		/* Floating point status.  */
-  unsigned long	int gp;			/* Global data pointer (gr1).  */
-  /* scratch registers: */
-  unsigned long	int gr8,   gr9, gr10, gr11,       gr13, gr14, gr15;
-  unsigned long	int gr16, gr17, gr18, gr19, gr20, gr21, gr22, gr23;
-  unsigned long	int gr24, gr25, gr26, gr27, gr28, gr29, gr30, gr31;
-  unsigned long	int ar_unat;
-  unsigned long	int ar_ec;
-  unsigned long	int ar_ccv;
-  /* RSE state: */
-  unsigned long	int ar_bsp_base;	/* Location of RSE spill area.  */
-  unsigned long	int ar_pfs;
-  unsigned long	int ar_rsc;
-  unsigned long int ar_bspstore;
-  unsigned long	int ar_rnat;
-  /* Misc. state: */
-  unsigned long	int dirty;		/* BSP - BSPSTORE */
-  unsigned long int cr_tpr;		/* Hw interrupt mask register.  */
-  unsigned long	int tpdp;		/* thread private data pointer.  */
-  unsigned long	int br_6, br_7;
-  /* Argument regs (gr32-gr39):  */
-  unsigned long	int arg0, arg1, arg2, arg3;
-  unsigned long	int arg4, arg5, arg6, arg7;
-  unsigned long	int ss_flags;		/* Save state flags.  */
-  unsigned long int br_1, br_2, br_3, br_4, br_5; /* Branch registers.  */
-  unsigned long int p_regs;		/* Predicates.  */
-} mcontext_t;
+/*
+ * These are here mostly for backwards compatibility with older Unices.
+ * IA-64 Linux does not distinguish between "struct sigcontext" and
+ * "ucontext_t" as all the necessary info is inside the former.
+ */
 
+typedef struct sigcontext mcontext_t;
+
+#ifdef __GNUC__
+# define _SC_GR0_OFFSET	\
+	(((char *) &((struct sigcontext *) 0)->sc_gr[0]) - (char *) 0)
+#else
+# define _SC_GR0_OFFSET	0xc8	/* pray that this is correct... */
+#endif
 
 typedef struct ucontext
-{
-  mcontext_t uc_mcontext;		/* saved machine state */
-  int uc_spares[8];			/* room to grow... */
-  unsigned int uc_created_by_getcontext: 1;
-  unsigned int uc_reserved_flags: 31;
-  struct ucontext *uc_link;
-  __sigset_t uc_sigmask;
-  stack_t uc_stack;
-} ucontext_t;
+  {
+    union
+      {
+	mcontext_t _mc;
+	struct
+	  {
+	    unsigned long _pad[_SC_GR0_OFFSET/8];
+	    struct ucontext *_link;	/* this should overlay sc_gr[0] */
+	  }
+	_uc;
+      }
+    _u;
+  }
+ucontext_t;
+
+#define uc_mcontext	_u._mc
+#define uc_sigmask	_u._mc.sc_sigmask
+#define uc_stack	_u._mc.sc_stack
+#define uc_link		_u._uc._link
 
 #endif /* sys/ucontext.h */