This file creates register sets based on the runtime specification.

The advantage of using register sets is that you don't focus on each
register seperately, but instead instroduce a level of abstraction.
This reduces the chance of errors, and also simplifies the code.
The register sers form the basis of everything register.
The sets in this file are:

struct _special
contains all of the control related registers, such as instruction
pointer and stack pointer. It also contains interrupt specific registers
like the faulting address. The set is roughly split in 3 groups. The
first contains the registers that define a context or thread. This is
the only group that the kernel needs to switch threads.  The second group
contains registers needed in addition to the first group needed to switch
userland threads. This group contains the thread pointer and the FP control
register. The third group contains those registers we need for execption
handling and are used on top of the first two groups.

struct _callee_saved, struct _callee_saved_fp
These sets contain the preserved registers, including the NaT after
spilling. The general registers (including branch registers) are
seperated from the FP registers for ptrace(2).

struct _caller_saved, struct _caller_saved_fp
These sets contain the scratch registers based on SDM 2.1, This means that
both ar.csd and ar.ccd are included here, even though they contain ia32
segment register descriptions. We keep seperate NaT bits for scratch and
preserved registers, because they are never saved/restored at the same
time.

struct _high_fp
The upper 96 FP registers that can be enabled/disabled seperately on
the CPU from the lower 32 FP registers. Due to the size of this set,
we treat them specially, even though they are defined as scratch
registers.

CVS ----------------------------------------------------------------------

1 files changed, 180 insertions, 0 deletions

diff --git a/sys/ia64/include/_regset.h b/sys/ia64/include/_regset.h
new file mode 100644
index 0000000..1a89419
--- /dev/null
+++ b/sys/ia64/include/_regset.h
@@ -0,0 +1,180 @@
+/*
+ * Copyright (c) 2002, 2003 Marcel Moolenaar
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _MACHINE_REGSET_H_
+#define	_MACHINE_REGSET_H_
+
+/*
+ * Create register sets, based on the runtime specification. This allows
+ * us to better reuse code and to copy sets around more efficiently.
+ * Contexts are defined in terms of these sets. These include trapframe,
+ * sigframe, pcb, mcontext, reg and fpreg. Other candidates are unwind
+ * and coredump related contexts.
+ *
+ * Notes:
+ * o  Constant registers (r0, f0 and f1) are not accounted for,
+ * o  The stacked registers (r32-r127) are not accounted for,
+ * o  Predicates are not split across sets.
+ */
+
+/* A single FP register. */
+struct _ia64_fpreg {
+	unsigned char	fpr_bits[16];
+} __aligned(16);
+
+/*
+ * Special registers.
+ */
+struct _special {
+	unsigned long		sp;
+	unsigned long		unat;		/* NaT before spilling */
+	unsigned long		rp;
+	unsigned long		pr;
+	unsigned long		pfs;
+	unsigned long		bspstore;
+	unsigned long		rnat;
+	unsigned long		__spare;
+	/* Userland context and syscalls */
+	unsigned long		tp;
+	unsigned long		rsc;
+	unsigned long		fpsr;
+	unsigned long		psr;
+	/* ASYNC: Interrupt specific */
+	unsigned long		gp;
+	unsigned long		ndirty;
+	unsigned long		cfm;
+	unsigned long		iip;
+	unsigned long		ifa;
+	unsigned long		isr;
+};
+
+struct _high_fp {
+	struct _ia64_fpreg	fr[96];		/* High FP register set. */
+/* Can't be bothered to name them seperately. They are fr32-fr127. */
+};
+
+/*
+ * Preserved registers.
+ */
+struct _callee_saved {
+	unsigned long		unat;		/* NaT after spilling. */
+	unsigned long		gr4;
+	unsigned long		gr5;
+	unsigned long		gr6;
+	unsigned long		gr7;
+	unsigned long		br1;
+	unsigned long		br2;
+	unsigned long		br3;
+	unsigned long		br4;
+	unsigned long		br5;
+	unsigned long		lc;
+	unsigned long		__spare;
+};
+
+struct _callee_saved_fp {
+	struct _ia64_fpreg	fr2;
+	struct _ia64_fpreg	fr3;
+	struct _ia64_fpreg	fr4;
+	struct _ia64_fpreg	fr5;
+	struct _ia64_fpreg	fr16;
+	struct _ia64_fpreg	fr17;
+	struct _ia64_fpreg	fr18;
+	struct _ia64_fpreg	fr19;
+	struct _ia64_fpreg	fr20;
+	struct _ia64_fpreg	fr21;
+	struct _ia64_fpreg	fr22;
+	struct _ia64_fpreg	fr23;
+	struct _ia64_fpreg	fr24;
+	struct _ia64_fpreg	fr25;
+	struct _ia64_fpreg	fr26;
+	struct _ia64_fpreg	fr27;
+	struct _ia64_fpreg	fr28;
+	struct _ia64_fpreg	fr29;
+	struct _ia64_fpreg	fr30;
+	struct _ia64_fpreg	fr31;
+};
+
+/*
+ * Scratch registers.
+ */
+struct _caller_saved {
+	unsigned long		unat;		/* NaT after spilling. */
+	unsigned long		gr2;
+	unsigned long		gr3;
+	unsigned long		gr8;
+	unsigned long		gr9;
+	unsigned long		gr10;
+	unsigned long		gr11;
+	unsigned long		gr14;
+	unsigned long		gr15;
+	unsigned long		gr16;
+	unsigned long		gr17;
+	unsigned long		gr18;
+	unsigned long		gr19;
+	unsigned long		gr20;
+	unsigned long		gr21;
+	unsigned long		gr22;
+	unsigned long		gr23;
+	unsigned long		gr24;
+	unsigned long		gr25;
+	unsigned long		gr26;
+	unsigned long		gr27;
+	unsigned long		gr28;
+	unsigned long		gr29;
+	unsigned long		gr30;
+	unsigned long		gr31;
+	unsigned long		br6;
+	unsigned long		br7;
+	unsigned long		ccv;
+	unsigned long		csd;
+	unsigned long		ssd;
+};
+
+struct _caller_saved_fp {
+	struct _ia64_fpreg	fr6;
+	struct _ia64_fpreg	fr7;
+	struct _ia64_fpreg	fr8;
+	struct _ia64_fpreg	fr9;
+	struct _ia64_fpreg	fr10;
+	struct _ia64_fpreg	fr11;
+	struct _ia64_fpreg	fr12;
+	struct _ia64_fpreg	fr13;
+	struct _ia64_fpreg	fr14;
+	struct _ia64_fpreg	fr15;
+};
+
+#ifdef _KERNEL
+void	restore_callee_saved(struct _callee_saved *);
+void	restore_callee_saved_fp(struct _callee_saved_fp *);
+void	restore_high_fp(struct _high_fp *);
+void	save_callee_saved(struct _callee_saved *);
+void	save_callee_saved_fp(struct _callee_saved_fp *);
+void	save_high_fp(struct _high_fp *);
+#endif
+
+#endif	/* _MACHINE_REGSET_H_ */