aarch64: Add exception type definitions

A few yet-unimplemented codes are also sketched out; these are included
so you know roughly what to expect once the missing functionality gets
implemented, but are not in any way stable or usable.
Message-ID: <20240415090149.38358-7-bugaevc@gmail.com>

2 files changed, 91 insertions, 0 deletions

diff --git a/aarch64/Makefrag.am b/aarch64/Makefrag.am
index ff7bcefb..13c9439a 100644
--- a/aarch64/Makefrag.am
+++ b/aarch64/Makefrag.am
@@ -30,6 +30,7 @@ include_mach_aarch64dir = $(includedir)/mach/aarch64
 include_mach_aarch64_HEADERS = \
 	aarch64/include/mach/aarch64/asm.h \
 	aarch64/include/mach/aarch64/boolean.h \
+	aarch64/include/mach/aarch64/exception.h \
 	aarch64/include/mach/aarch64/kern_return.h \
 	aarch64/include/mach/aarch64/mach_aarch64.defs \
 	aarch64/include/mach/aarch64/mach_aarch64_types.h \
diff --git a/aarch64/include/mach/aarch64/exception.h b/aarch64/include/mach/aarch64/exception.h
new file mode 100644
index 00000000..2e96e09a
--- /dev/null
+++ b/aarch64/include/mach/aarch64/exception.h
@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 2023-2024 Free Software Foundation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+/*
+ *	Codes and subcodes for AArch64 exceptions.
+ */
+#ifndef	_MACH_AARCH64_EXCEPTION_H_
+#define _MACH_AARCH64_EXCEPTION_H_
+
+
+/*
+ *	EXC_BAD_INSTRUCTION
+ */
+
+#define EXC_AARCH64_UNK			1	/* unknown reason (unallocated instruction) */
+#define EXC_AARCH64_IL			2	/* illegal execution state (PSTATE.IL set) */
+
+/*
+ *	EXC_ARITHMETIC
+ */
+
+#define EXC_AARCH64_IDF			1	/* floating-point input denormal */
+#define EXC_AARCH64_IXF			2	/* floating-point inexact */
+#define EXC_AARCH64_UFF			3	/* floating-point underflow */
+#define EXC_AARCH64_OFF			4	/* floating-point overflow */
+#define EXC_AARCH64_DZF			5	/* floating-point divide by zero */
+#define EXC_AARCH64_IOF			6	/* floating-point invalid operation */
+
+/*
+ *	EXC_SOFTWARE
+ */
+
+#define EXC_AARCH64_SVC			1	/* SVC that's not a valid syscall, subcode contains immediate */
+
+/*
+Not yet:
+#define EXC_AARCH64_HVC			2	HVC, subcode contains immediate
+#define EXC_AARCH64_SMC			3	SMC, subcode contains immediate
+*/
+
+/*
+ *	EXC_BAD_ACCESS
+ *
+ *	Exception code normally holds a kern_return_t value (such as
+ *	KERN_INVALID_ADDRESS), but for AArch64-specific exceptions these
+ *	values can be used as exception code instead; they must not conflict
+ *	with kern_return_t values.
+ */
+
+#define EXC_AARCH64_AL			100	/* alignment fault */
+#define EXC_AARCH64_AL_PC		101	/* misaligned pc */
+#define EXC_AARCH64_AL_SP		102	/* misaligned sp */
+#define EXC_AARCH64_PAC			103	/* PAC failure, subcode describes the key */
+#define EXC_AARCH64_BTI			104	/* BTI failure, subcode contains BTYPE */
+
+/*
+Not yet:
+#define EXC_AARCH64_MTE			105	MTE failure
+*/
+
+/*
+ *	EXC_BREAKPOINT
+ */
+
+#define EXC_AARCH64_BRK			1	/* BRK instruction, subcode contains immediate */
+#define EXC_AARCH64_SS			2	/* software single step, subcode contains EX flag, or -1 if unknown */
+#define EXC_AARCH64_BREAKPT		3	/* hardware breakpoint */
+
+/*
+Not yet:
+#define EXC_AARCH64_WATCHPT_READ	4	hardware watchpoint (read), subcode contains accessed address
+#define EXC_AARCH64_WATCHPT_WRITE	5	hardware watchpoint (write), subcode contains accessed address
+*/
+
+#endif	/* _MACH_AARCH64_EXCEPTION_H_ */