riscv: allow resume after exception

If CSRs like seed are readable by S-mode, may not be determinable by
S-mode. For safe driver probing allow to resume via a longjmp after an
exception.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>

4 files changed, 65 insertions, 0 deletions

diff --git a/arch/riscv/lib/interrupts.c b/arch/riscv/lib/interrupts.c
index 02dbcfd..a26ccc7 100644
--- a/arch/riscv/lib/interrupts.c
+++ b/arch/riscv/lib/interrupts.c
@@ -12,6 +12,7 @@
 #include <linux/compat.h>
 #include <efi_loader.h>
 #include <hang.h>
+#include <interrupt.h>
 #include <irq_func.h>
 #include <asm/global_data.h>
 #include <asm/ptrace.h>
@@ -21,6 +22,13 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
+static struct resume_data *resume;
+
+void set_resume(struct resume_data *data)
+{
+	resume = data;
+}
+
 static void show_efi_loaded_images(uintptr_t epc)
 {
 	efi_print_image_infos((void *)epc);
@@ -105,6 +113,11 @@ static void _exit_trap(ulong code, ulong epc, ulong tval, struct pt_regs *regs)
 		"Store/AMO page fault",
 	};
 
+	if (resume) {
+		resume->code = code;
+		longjmp(resume->jump, 1);
+	}
+
 	if (code < ARRAY_SIZE(exception_code))
 		printf("Unhandled exception: %s\n", exception_code[code]);
 	else
diff --git a/doc/api/index.rst b/doc/api/index.rst
index 2f0218c..51b2013 100644
--- a/doc/api/index.rst
+++ b/doc/api/index.rst
@@ -12,6 +12,7 @@ U-Boot API documentation
    efi
    event
    getopt
+   interrupt
    linker_lists
    lmb
    logging
diff --git a/doc/api/interrupt.rst b/doc/api/interrupt.rst
new file mode 100644
index 0000000..5721231
--- /dev/null
+++ b/doc/api/interrupt.rst
@@ -0,0 +1,6 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+Interrupt API
+=============
+
+.. kernel-doc:: include/interrupt.h
diff --git a/include/interrupt.h b/include/interrupt.h
new file mode 100644
index 0000000..46ef2e1
--- /dev/null
+++ b/include/interrupt.h
@@ -0,0 +1,45 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <asm/setjmp.h>
+
+/**
+ * struct resume_data - data for resume after interrupt
+ */
+struct resume_data {
+	/** @jump: longjmp buffer */
+	jmp_buf jump;
+	/** @code: exception code */
+	ulong code;
+};
+
+/**
+ * set_resume() - set longjmp buffer for resuming after exception
+ *
+ * By calling this function it is possible to use a long jump to catch an
+ * exception. The caller sets the long jump buffer with set_resume() and then
+ * executes setjmp(). If an exception occurs, the code will return to the
+ * setjmp caller(). The exception code will be returned in @data->code.
+ *
+ * After the critical operation call set_resume(NULL) so that an exception in
+ * another part of the code will not accidently invoke the long jump.
+ *
+ * .. code-block:: c
+ *
+ *     // This example shows how to use set_resume().
+ *
+ *     struct resume_data resume;
+ *     int ret;
+ *
+ *     set_resume(&resume);
+ *     ret = setjmp(resume.jump);
+ *     if (ret) {
+ *          printf("An exception %ld occurred\n", resume.code);
+ *     } else {
+ *          // Do what might raise an exception here.
+ *     }
+ *     set_resume(NULL);
+ *
+ * @data:	pointer to structure with longjmp address
+ * Return:	0 before an exception, 1 after an exception occurred
+ */
+void set_resume(struct resume_data *data);