kernel/aarch64: Add exception code + frame fixups

- Add handle_exception() as higher level logic to handle the exceptions
- Simplify frame.h
- Call C handler in vector.S
- Clean up stack after creating frame
- Add register dump on exception

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 54 insertions, 0 deletions

diff --git a/sys/include/arch/aarch64/exception.h b/sys/include/arch/aarch64/exception.h
new file mode 100644
index 0000000..9e89c81
--- /dev/null
+++ b/sys/include/arch/aarch64/exception.h
@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
+ * 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.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER OR CONTRIBUTORS 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.
+ */
+
+#ifndef _MACHINE_EXCEPTION_H_
+#define _MACHINE_EXCEPTION_H_
+
+#include <sys/types.h>
+#include <machine/frame.h>
+
+/* Exception class */
+#define EC_UNKNOWN  0x00    /* Unknown type */
+#define EC_WF       0x01    /* Trapped WF instruction */
+#define EC_MCRMRC   0x03    /* Trapped MCR/MRC */
+#define EC_MCRRC    0x04    /* Trapped MCRR/MRRC */
+#define EC_LDCSTC   0x06    /* Trapped LDC/STC */
+#define EC_SVE      0x07    /* Trapped SVE/SIMD/FP op */
+#define EC_BRE      0x0D    /* Branch target exception */
+#define EC_ILLX     0x0E    /* Illegal execution state */
+#define EC_SVC64    0x15    /* AARCH64 SVC */
+#define EC_PCALIGN  0x22    /* PC alignment fault */
+#define EC_DABORT   0x24    /* Data abort (w/o ELx change) */
+#define EC_EDABORT  0x25    /* Data abort (w/ ELx change) */
+#define EC_SPALIGN  0x26    /* SP alignment fault */
+#define EC_SERR     0x2F    /* System error (what the fuck!) */
+
+void handle_exception(struct trapframe *tf);
+
+#endif  /* !_MACHINE_EXCEPTION_H_ */