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cmd/exception: support ebreak exception on RISC-V

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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>
This commit is contained in:
Heinrich Schuchardt 2021-04-09 10:48:14 +00:00 committed by Leo Yu-Chi Liang
parent 1412b8d48a
commit 91e4b7516d
2 changed files with 13 additions and 0 deletions
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10
cmd/riscv/exception.c
View File

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

3
doc/usage/exception.rst
View File

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