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cmd/exception: support ebreak exception on RISC-V

The ebreak instruction should generate a breakpoint exception.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Rick Chen <rick@andestech.com>
Heinrich Schuchardt 3 years ago
parent
commit
91e4b7516d
2 changed files with 13 additions and 0 deletions
  1. 10 0
      cmd/riscv/exception.c
  2. 3 0
      doc/usage/exception.rst

+ 10 - 0
cmd/riscv/exception.c

@@ -8,6 +8,13 @@
 #include <common.h>
 #include <command.h>
 
+static int do_ebreak(struct cmd_tbl *cmdtp, int flag, int argc,
+			char *const argv[])
+{
+	asm volatile ("ebreak\n");
+	return CMD_RET_FAILURE;
+}
+
 static int do_unaligned(struct cmd_tbl *cmdtp, int flag, int argc,
 			char *const argv[])
 {
@@ -28,6 +35,8 @@ static int do_undefined(struct cmd_tbl *cmdtp, int flag, int argc,
 }
 
 static struct cmd_tbl cmd_sub[] = {
+	U_BOOT_CMD_MKENT(ebreak, CONFIG_SYS_MAXARGS, 1, do_ebreak,
+			 "", ""),
 	U_BOOT_CMD_MKENT(unaligned, CONFIG_SYS_MAXARGS, 1, do_unaligned,
 			 "", ""),
 	U_BOOT_CMD_MKENT(undefined, CONFIG_SYS_MAXARGS, 1, do_undefined,
@@ -37,6 +46,7 @@ static struct cmd_tbl cmd_sub[] = {
 static char exception_help_text[] =
 	"<ex>\n"
 	"  The following exceptions are available:\n"
+	"  ebreak    - breakpoint\n"
 	"  undefined - illegal instruction\n"
 	"  unaligned - load address misaligned\n"
 	;

+ 3 - 0
doc/usage/exception.rst

@@ -31,6 +31,9 @@ type
 
   **RISC-V:**
 
+  ebreak
+    breakpoint exception
+
   unaligned
     load address misaligned