Eric Lee / smarc-uboot

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Commit dab8788a8cadaa18a44001f98fa959fc672fff4f

Authored by Heinrich Schuchardt
Committed by Tom Rini
1 parent c986aa624b
Exists in smarc_8mq_lf_v2020.04 and in 9 other branches 8qm-imx_v2020.04_5.4.70_2.3.0, emb_lf_v2022.04, pitx_8mp_lf_v2020.04, smarc-8m-android-10.0.0_2.6.0, smarc-8m-android-11.0.0_2.0.0, smarc-8mp-android-11.0.0_2.0.0, smarc_8mm-imx_v2020.04_5.4.24_2.1.0, smarc_8mp_lf_v2020.04, smarc_8mq-imx_v2020.04_5.4.24_2.1.0

cmd: add exception command 

The 'exception' command allows to test exception handling.

This implementation supports ARM, x86, RISC-V and the following exceptions:
* 'breakpoint' - prefetch abort exception (ARM 32bit only)
* 'unaligned'  - data abort exception (ARM only)
* 'undefined'  - undefined instruction exception

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

Showing 11 changed files with 232 additions and 0 deletions Side-by-side Diff

... ... @@ -86,6 +86,7 @@
86 86 S: Maintained
87 87 T: git git://git.denx.de/u-boot-arm.git
88 88 F: arch/arm/
  89 +F: cmd/arm/
89 90  
90 91 ARM ALTERA SOCFPGA
91 92 M: Marek Vasut <marex@denx.de>
... ... @@ -677,6 +678,7 @@
677 678 S: Maintained
678 679 T: git git://git.denx.de/u-boot-riscv.git
679 680 F: arch/riscv/
  681 +F: cmd/riscv/
680 682 F: tools/prelink-riscv.c
681 683  
682 684 ROCKUSB
... ... @@ -788,6 +790,7 @@
788 790 S: Maintained
789 791 T: git git://git.denx.de/u-boot-x86.git
790 792 F: arch/x86/
  793 +F: cmd/x86/
791 794  
792 795 XTENSA
793 796 M: Max Filippov <jcmvbkbc@gmail.com>
... ... @@ -1433,6 +1433,12 @@
1433 1433 particularly for managing boot parameters as well as examining
1434 1434 various EFI status for debugging.
1435 1435  
  1436 +config CMD_EXCEPTION
  1437 + bool "exception - raise exception"
  1438 + depends on ARM || RISCV || X86
  1439 + help
  1440 + Enable the 'exception' command which allows to raise an exception.
  1441 +
1436 1442 config CMD_LED
1437 1443 bool "led"
1438 1444 depends on LED
... ... @@ -173,6 +173,8 @@
173 173 # Android Verified Boot 2.0
174 174 obj-$(CONFIG_CMD_AVB) += avb.o
175 175  
  176 +obj-$(CONFIG_ARM) += arm/
  177 +obj-$(CONFIG_RISCV) += riscv/
176 178 obj-$(CONFIG_X86) += x86/
177 179  
178 180 obj-$(CONFIG_ARCH_MVEBU) += mvebu/
  1 +# SPDX-License-Identifier: GPL-2.0+
  2 +
  3 +ifdef CONFIG_ARM64
  4 +obj-$(CONFIG_CMD_EXCEPTION) += exception64.o
  5 +else
  6 +obj-$(CONFIG_CMD_EXCEPTION) += exception.o
  7 +endif
  1 +// SPDX-License-Identifier: GPL-2.0+
  2 +/*
  3 + * The 'exception' command can be used for testing exception handling.
  4 + *
  5 + * Copyright (c) 2018, Heinrich Schuchardt <xypron.glpk@gmx.de>
  6 + */
  7 +
  8 +#include <common.h>
  9 +#include <command.h>
  10 +
  11 +static int do_unaligned(cmd_tbl_t *cmdtp, int flag, int argc,
  12 + char * const argv[])
  13 +{
  14 + /*
  15 + * The LDRD instruction requires the data source to be four byte aligned
  16 + * even if strict alignment fault checking is disabled in the system
  17 + * control register.
  18 + */
  19 + asm volatile (
  20 + "MOV r5, sp\n"
  21 + "ADD r5, #1\n"
  22 + "LDRD r6, r7, [r5]\n");
  23 + return CMD_RET_FAILURE;
  24 +}
  25 +
  26 +static int do_breakpoint(cmd_tbl_t *cmdtp, int flag, int argc,
  27 + char * const argv[])
  28 +{
  29 + asm volatile ("BKPT #123\n");
  30 + return CMD_RET_FAILURE;
  31 +}
  32 +
  33 +static int do_undefined(cmd_tbl_t *cmdtp, int flag, int argc,
  34 + char * const argv[])
  35 +{
  36 + /*
  37 + * 0xe7f...f. is undefined in ARM mode
  38 + * 0xde.. is undefined in Thumb mode
  39 + */
  40 + asm volatile (".word 0xe7f7defb\n");
  41 + return CMD_RET_FAILURE;
  42 +}
  43 +
  44 +static cmd_tbl_t cmd_sub[] = {
  45 + U_BOOT_CMD_MKENT(breakpoint, CONFIG_SYS_MAXARGS, 1, do_breakpoint,
  46 + "", ""),
  47 + U_BOOT_CMD_MKENT(unaligned, CONFIG_SYS_MAXARGS, 1, do_unaligned,
  48 + "", ""),
  49 + U_BOOT_CMD_MKENT(undefined, CONFIG_SYS_MAXARGS, 1, do_undefined,
  50 + "", ""),
  51 +};
  52 +
  53 +static char exception_help_text[] =
  54 + "<ex>\n"
  55 + " The following exceptions are available:\n"
  56 + " breakpoint - prefetch abort\n"
  57 + " unaligned - data abort\n"
  58 + " undefined - undefined instruction\n"
  59 + ;
  60 +
  61 +#include <exception.h>
cmd/arm/exception64.c
Diff comments   View file @ dab8788
  1 +// SPDX-License-Identifier: GPL-2.0+
  2 +/*
  3 + * The 'exception' command can be used for testing exception handling.
  4 + *
  5 + * Copyright (c) 2018, Heinrich Schuchardt <xypron.glpk@gmx.de>
  6 + */
  7 +
  8 +#include <common.h>
  9 +#include <command.h>
  10 +
  11 +static int do_undefined(cmd_tbl_t *cmdtp, int flag, int argc,
  12 + char * const argv[])
  13 +{
  14 + /*
  15 + * 0xe7f...f. is undefined in ARM mode
  16 + * 0xde.. is undefined in Thumb mode
  17 + */
  18 + asm volatile (".word 0xe7f7defb\n");
  19 + return CMD_RET_FAILURE;
  20 +}
  21 +
  22 +static cmd_tbl_t cmd_sub[] = {
  23 + U_BOOT_CMD_MKENT(undefined, CONFIG_SYS_MAXARGS, 1, do_undefined,
  24 + "", ""),
  25 +};
  26 +
  27 +static char exception_help_text[] =
  28 + "<ex>\n"
  29 + " The following exceptions are available:\n"
  30 + " undefined - undefined instruction\n"
  31 + ;
  32 +
  33 +#include <exception.h>
  1 +# SPDX-License-Identifier: GPL-2.0+
  2 +
  3 +obj-$(CONFIG_CMD_EXCEPTION) += exception.o
cmd/riscv/exception.c
Diff comments   View file @ dab8788
  1 +// SPDX-License-Identifier: GPL-2.0+
  2 +/*
  3 + * The 'exception' command can be used for testing exception handling.
  4 + *
  5 + * Copyright (c) 2018, Heinrich Schuchardt <xypron.glpk@gmx.de>
  6 + */
  7 +
  8 +#include <common.h>
  9 +#include <command.h>
  10 +
  11 +static int do_undefined(cmd_tbl_t *cmdtp, int flag, int argc,
  12 + char * const argv[])
  13 +{
  14 + asm volatile (".word 0xffffffff\n");
  15 + return CMD_RET_FAILURE;
  16 +}
  17 +
  18 +static cmd_tbl_t cmd_sub[] = {
  19 + U_BOOT_CMD_MKENT(undefined, CONFIG_SYS_MAXARGS, 1, do_undefined,
  20 + "", ""),
  21 +};
  22 +
  23 +static char exception_help_text[] =
  24 + "<ex>\n"
  25 + " The following exceptions are available:\n"
  26 + " undefined - undefined instruction\n"
  27 + ;
  28 +
  29 +#include <exception.h>
1 1 # SPDX-License-Identifier: GPL-2.0+
2 2  
3 3 obj-y += mtrr.o
  4 +obj-$(CONFIG_CMD_EXCEPTION) += exception.o
4 5 obj-$(CONFIG_HAVE_FSP) += fsp.o
  1 +// SPDX-License-Identifier: GPL-2.0+
  2 +/*
  3 + * The 'exception' command can be used for testing exception handling.
  4 + *
  5 + * Copyright (c) 2018, Heinrich Schuchardt <xypron.glpk@gmx.de>
  6 + */
  7 +
  8 +#include <common.h>
  9 +#include <command.h>
  10 +
  11 +static int do_undefined(cmd_tbl_t *cmdtp, int flag, int argc,
  12 + char * const argv[])
  13 +{
  14 + asm volatile (".word 0xffff\n");
  15 + return CMD_RET_FAILURE;
  16 +}
  17 +
  18 +static cmd_tbl_t cmd_sub[] = {
  19 + U_BOOT_CMD_MKENT(undefined, CONFIG_SYS_MAXARGS, 1, do_undefined,
  20 + "", ""),
  21 +};
  22 +
  23 +static char exception_help_text[] =
  24 + "<ex>\n"
  25 + " The following exceptions are available:\n"
  26 + " undefined - undefined instruction\n"
  27 + ;
  28 +
  29 +#include <exception.h>
  1 +/* SPDX-License-Identifier: GPL-2.0+ */
  2 +/*
  3 + * The 'exception' command can be used for testing exception handling.
  4 + *
  5 + * Copyright (c) 2018, Heinrich Schuchardt <xypron.glpk@gmx.de>
  6 + */
  7 +
  8 +static int do_exception(cmd_tbl_t *cmdtp, int flag, int argc,
  9 + char * const argv[])
  10 +{
  11 + cmd_tbl_t *cp;
  12 +
  13 + if (argc != 2)
  14 + return CMD_RET_USAGE;
  15 +
  16 + /* drop sub-command parameter */
  17 + argc--;
  18 + argv++;
  19 +
  20 + cp = find_cmd_tbl(argv[0], cmd_sub, ARRAY_SIZE(cmd_sub));
  21 +
  22 + if (cp)
  23 + return cp->cmd(cmdtp, flag, argc, argv);
  24 +
  25 + return CMD_RET_USAGE;
  26 +}
  27 +
  28 +static int exception_complete(int argc, char * const argv[], char last_char,
  29 + int maxv, char *cmdv[])
  30 +{
  31 + int len = 0;
  32 + int i = 0;
  33 + cmd_tbl_t *cmdtp;
  34 +
  35 + switch (argc) {
  36 + case 1:
  37 + break;
  38 + case 2:
  39 + len = strlen(argv[1]);
  40 + break;
  41 + default:
  42 + return 0;
  43 + }
  44 + for (cmdtp = cmd_sub; cmdtp != cmd_sub + ARRAY_SIZE(cmd_sub); cmdtp++) {
  45 + if (i >= maxv - 1)
  46 + return i;
  47 + if (!strncmp(argv[1], cmdtp->name, len))
  48 + cmdv[i++] = cmdtp->name;
  49 + }
  50 + cmdv[i] = NULL;
  51 + return i;
  52 +}
  53 +
  54 +U_BOOT_CMD_COMPLETE(
  55 + exception, 2, 0, do_exception,
  56 + "Forces an exception to occur",
  57 + exception_help_text, exception_complete
  58 +);