[PATCH 6/9] aarch64: Add exception type definitions

[Sergey Bugaev]

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.
---
 aarch64/Makefrag.am                      |  1 +
 aarch64/include/mach/aarch64/exception.h | 90 ++++++++++++++++++++++++
 2 files changed, 91 insertions(+)
 create mode 100644 aarch64/include/mach/aarch64/exception.h

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_ */
-- 
2.44.0