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cmd: add rdcycle test to RISC-V exception command

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Some versions of KVM don't allow access to the cycle CSR.

Provide a command 'exception rdcycle' for testing.

If the cycle CSR is accessible, we get an output like:

    => exception rdcycle
    cycle = 0x41f7563de

If the cycle CSR is not accessible, we get an output like:

    => exception rdcycle
    Unhandled exception: Illegal instruction

Put subcommands into alphabetical order in long help.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
This commit is contained in:
Heinrich Schuchardt 2024-08-11 16:41:23 +02:00 • committed by Leo Yu-Chi Liang
parent 4a36d217bb
commit 1806fed0ce
1 changed files with 13 additions and 2 deletions
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15
cmd/riscv/exception.c
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@ -36,6 +36,14 @@ static int do_ialign16(struct cmd_tbl *cmdtp, int flag, int argc,
return CMD_RET_SUCCESS;
}
static int do_rdcycle(struct cmd_tbl *cmdtp, int flag, int argc,
char *const argv[])
{
printf("cycle = 0x%lx\n", csr_read(CSR_CYCLE));
return CMD_RET_SUCCESS;
}
static int do_unaligned(struct cmd_tbl *cmdtp, int flag, int argc,
char *const argv[])
{
@ -62,6 +70,8 @@ static struct cmd_tbl cmd_sub[] = {
"", ""),
U_BOOT_CMD_MKENT(ialign16, CONFIG_SYS_MAXARGS, 1, do_ialign16,
"", ""),
U_BOOT_CMD_MKENT(rdcycle, CONFIG_SYS_MAXARGS, 1, do_rdcycle,
"", ""),
U_BOOT_CMD_MKENT(unaligned, CONFIG_SYS_MAXARGS, 1, do_unaligned,
"", ""),
U_BOOT_CMD_MKENT(undefined, CONFIG_SYS_MAXARGS, 1, do_undefined,
@ -74,7 +84,8 @@ U_BOOT_LONGHELP(exception,
" compressed - compressed instruction\n"
" ebreak - breakpoint\n"
" ialign16 - 16 bit aligned instruction\n"
" undefined - illegal instruction\n"
" unaligned - load address misaligned\n");
" rdcycle - read cycle CSR\n"
" unaligned - load address misaligned\n"
" undefined - illegal instruction\n");
#include <exception.h>