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| author | Heinrich Schuchardt | 2023-09-21 12:39:29 +0200 |
|---|---|---|
| committer | Leo Yu-Chi Liang | 2023-10-04 17:59:43 +0800 |
| commit | ef5ccaae64b670bc3183e20378d1fa31c86c9f44 (patch) | |
| tree | 96efcedb613d25b83d5a2fbd30b1aa7ce50a44b8 | |
| parent | f2e4b9d3c2f858f5ce7e317b2974d74353abb2a2 (diff) | |
cmd/exception: test RISC-V 16 bit aligned instruction
A 16 bit aligned instruction should generated an exception if the C
extension is not available.
Provide an 'extension ialign16' command for testing exception handling.
For testing build qemu-riscv64_defconfig with CONFIG_RISCV_ISA_C=n
and run with
qemu-system-riscv64 -M virt -bios u-boot -nographic -cpu rv64,c=false
=> exception ialign16
Unhandled exception: Instruction address misaligned
EPC: 0000000087719138 RA: 0000000087719218 TVAL: 000000008771913e
EPC: 0000000080020138 RA: 0000000080020218 reloc adjusted
Code: 0113 0101 8067 0000 0113 ff01 3423 0011 (006f 0060)
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
| -rw-r--r-- | cmd/riscv/exception.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/cmd/riscv/exception.c b/cmd/riscv/exception.c index db8d8af0483..f38f454a0b1 100644 --- a/cmd/riscv/exception.c +++ b/cmd/riscv/exception.c @@ -24,6 +24,19 @@ static int do_ebreak(struct cmd_tbl *cmdtp, int flag, int argc, return CMD_RET_FAILURE; } +static int do_ialign16(struct cmd_tbl *cmdtp, int flag, int argc, + char *const argv[]) +{ + asm volatile ( + /* jump skipping 2 bytes */ + ".long 0x0060006f\n" + ".long 0x006f0000\n" + ".long 0x00000060\n" + ); + printf("The system supports 16 bit aligned instructions.\n"); + return CMD_RET_SUCCESS; +} + static int do_unaligned(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[]) { @@ -48,6 +61,8 @@ static struct cmd_tbl cmd_sub[] = { "", ""), U_BOOT_CMD_MKENT(ebreak, CONFIG_SYS_MAXARGS, 1, do_ebreak, "", ""), + U_BOOT_CMD_MKENT(ialign16, CONFIG_SYS_MAXARGS, 1, do_ialign16, + "", ""), U_BOOT_CMD_MKENT(unaligned, CONFIG_SYS_MAXARGS, 1, do_unaligned, "", ""), U_BOOT_CMD_MKENT(undefined, CONFIG_SYS_MAXARGS, 1, do_undefined, @@ -59,6 +74,7 @@ static char exception_help_text[] = " The following exceptions are available:\n" " compressed - compressed instruction\n" " ebreak - breakpoint\n" + " ialign16 - 16 bit aligned instruction\n" " undefined - illegal instruction\n" " unaligned - load address misaligned\n" ; |