Commit graph

1832 commits

Author SHA1 Message Date
Simon Glass
77dd7c6854 x86: timer: use a timer base of 0
On x86 platforms the timer is reset to 0 when the SoC is reset. Having
this as the timer base is useful since it provides an indication of how
long it takes before U-Boot is running.

When U-Boot sets the timer base to something else, time is lost and we
no-longer have an accurate account of the time since reset. This
particularly affects bootstage.

Change the default to not read the timer base, leaving it at 0. Add an
option for when U-Boot is the secondary bootloader.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
2019-12-15 11:44:09 +08:00
Simon Glass
d721001fd6 net: Move the checksum functions to lib/
These functions are used by code outside the network support, so move them
to lib/ to be more accessible.

Without this, the functions are only accessible in SPL/TPL only if
CONFIG_SPL/TPL_NET are defined. Many boards do not enable those option but
still want to do checksums in this format.

Fix up a few code-style nits while we are here.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
2019-12-15 11:43:57 +08:00
Simon Glass
3c10dc95bd binman: Add a library to access binman entries
SPL and TPL can access information about binman entries using link-time
symbols but this is not available in U-Boot proper. Of course it could be
made available, but the intention is to just read the device tree.

Add support for this, so that U-Boot can locate entries.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
2019-12-15 08:48:33 +08:00
Joe Hershberger
6f8215681a lib: Always build support for formatting MAC and IP address
Even if not communicating over the network in U-Boot, code may be manipulating
and storing IP or MAC addresses to pass to Linux, etc.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
2019-12-09 09:47:41 -06:00
Joe Hershberger
fb8977c5be net: Always build the string_to_enetaddr() helper
Part of the env cleanup moved this out of the environment code and into
the net code. However, this helper is sometimes needed even when the net
stack isn't included.

Move the helper to lib/net_utils.c like it's similarly-purposed
string_to_ip(). Also rename the moved function to similar naming.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Reported-by: Ondrej Jirman <megous@megous.com>
2019-12-09 09:47:41 -06:00
AKASHI Takahiro
e85a787c7d lib: crypto: add pkcs7 message parser
Imported from linux kernel v5.3:
 pkcs7.asn1 without changes
 pkcs7.h with changes marked as __UBOOT__
 pkcs7_parser.h without changes
 pkcs7_parser.c with changes marked as __UBOOT__

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
2019-12-06 16:44:20 -05:00
AKASHI Takahiro
b4adf627d5 lib: crypto: add x509 parser
Imported from linux kernel v5.3:
 x509.asn1 without changes
 x509_akid.asn1 without changes
 x509_parser.h without changes
 x509_cert_parser.c with changes marked as __UBOOT__
 x509_public_key.c with changes marked as __UBOOT__

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
2019-12-06 16:44:20 -05:00
AKASHI Takahiro
9b933bf6f4 lib: crypto: add rsa public key parser
Imported from linux kernel v5.3:
rsapubkey.asn1 without changes
rsa.h without changes
rsa_helper.c with changes marked as __UBOOT__

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
2019-12-06 16:44:20 -05:00
AKASHI Takahiro
c4e961ecec lib: crypto: add public key utility
Imported from linux kernel v5.3:
 asymmetric-type.h with changes marked as __UBOOT__
 asymmetric_type.c with changes marked as __UBOOT__
 public_key.h with changes marked as __UBOOT__
 public_key.c with changes marked as __UBOOT__

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
2019-12-06 16:44:20 -05:00
AKASHI Takahiro
a9b45e6e83 lib: add oid registry utility
Imported from linux kernel v5.3:
 build_OID_registry without changes
 oid_registry.h without changes
 oid_registry.c with changes marked as __UBOOT__

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
2019-12-06 16:44:20 -05:00
AKASHI Takahiro
ab8a0e069d lib: add asn1 decoder
Imported from linux kernel v5.3:
 lib/asn1_decoder.c with changes marked as __UBOOT__

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
2019-12-06 16:44:20 -05:00
AKASHI Takahiro
2b12196dc1 cmd: add asn1_compiler
Imported from linux kernel v5.3:
 asn1.h without changes
 asn1_ber_bytecode.h without changes
 asn1_decoder.h without changes
 asn1_compiler.c without changes

This host command will be used to create a ASN1 parser, for example,
for pkcs7 messages or x509 certificates. More specifically, it will
generate *byte code* which will be interpreted by asn1 decoder library.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
2019-12-06 16:44:20 -05:00
AKASHI Takahiro
1872311727 lib: add mktime64() for linux compatibility
This function will be used  in lib/crypto/x509_cert_parser.c, which
will also be imported from linux code in a later commit.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
2019-12-06 16:44:19 -05:00
AKASHI Takahiro
05429b6cf5 rtc: move date.c from drivers/rtc/ to lib/
In the next commit, rtc_mktime(), for compatibility with linux, will be
implemented using rtc_mktime(), which is no longer drivers/rtc specific.
So move this file under lib/.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
2019-12-06 16:44:19 -05:00
AKASHI Takahiro
4839e86892 linux_compat: move kmemdup() from ubifs.c to linux_compat.c
linux_compat.c is the best place for kmemdup(), which is currenly used
only in ubifs.c, but will also be used when other kernel files
(in my case, lib/crypto/x509_cert_parser.c and pkcs7_parser.c) will be
imported. So just move it.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
2019-12-06 16:44:19 -05:00
Thomas Hebb
37ef1774d4 Kconfig: disambiguate config names for tiny printf
27084c03d3 ("spl: Allow tiny printf() to be controlled in SPL and
TPL") split this option in two for TPL and SPL, but didn't change the
Kconfig names, making them hard to set quickly.

Signed-off-by: Thomas Hebb <tommyhebb@gmail.com>
2019-12-03 08:43:23 -05:00
Simon Glass
67c4e9f815 common: Move board_get_usable_ram_top() out of common.h
Move this function into init.h which seems to be designed for this sort
of thing. Also update the header to declare struct global_data so that it
can be included without global_data.h being needed.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
2019-12-02 18:25:04 -05:00
Simon Glass
36bf446b64 common: Move enable/disable_interrupts out of common.h
Move these two functions into the irq_funcs.h header file. Also move
interrupt_handler_t as this is used by the irq_install_handler() function.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
2019-12-02 18:25:01 -05:00
Simon Glass
1eb69ae498 common: Move ARM cache operations out of common.h
These functions are CPU-related and do not use driver model. Move them to
cpu_func.h

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
2019-12-02 18:24:58 -05:00
Simon Glass
1045315df0 common: Move get_ticks() function out of common.h
This function belongs in time.h so move it over and add a comment.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
2019-12-02 18:23:13 -05:00
Simon Glass
6c03f9e618 common: Add a new lz4.h header file
Add a header file to house the lz4 compression function. Add a comment
while we are here, since it not even clear from the name what the function
actuall does.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
2019-12-02 18:23:11 -05:00
Simon Glass
2189d5f1e8 Move strtomhz() to vsprintf.h
At present this function sits in its own file but it does not really
justify it. There are similar string functions in vsprintf.h, so move it
there. Also add the missing function comment.

Use the vsprintf.h include file explicitly where needed.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
2019-12-02 18:23:09 -05:00
Simon Glass
8bef79bf3c common: Move sorting functions to their own header file
These don't need to be in common.h so move them out into a new header.
Also add some missing comments.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
2019-12-02 18:23:08 -05:00
Simon Glass
3db7110857 crc32: Use the crc.h header for crc functions
Drop inclusion of crc.h in common.h and use the correct header directly
instead.

With this we can drop the conflicting definition in fw_env.h and rely on
the crc.h header, which is already included.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
2019-12-02 18:23:08 -05:00
Simon Glass
b2ea91ba57 crc: Fix code style with crc functions
Some of these have a space before the bracket. Drop it to fix the style.
Add some missing function comments while here.

Note that u32 and u8 cannot be used here since crc.h is included on the
host side.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
2019-12-02 18:23:07 -05:00
Simon Glass
c3a4d1c3ee common: Drop linux/crc8.h
We have an existing U-Boot header for the one function that this defines.
Use that instead of the linux/ one. Move over the nice comment.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
2019-12-02 18:23:07 -05:00
Simon Glass
840ef4d43b common: Move random-number functions into their own header
Create a new rand.h header file and move functions into it, to reduce
the size of common.h

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
2019-12-02 18:23:07 -05:00
Heinrich Schuchardt
b7cdecfc19 efi_loader: default EFI_LOADER=n on ARM11
Some of the ARM11 boards have tight limits on the size of U-Boots. Hence
use EFI_LOADER=n as default on ARM11.

Set EFI_LOADER=y for the Raspberry Pi and Raspberry Pi Zero as these boards
have sufficient storage on the SD card.

Suggested-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
2019-11-23 09:19:31 +01:00
Heinrich Schuchardt
38064ee04c efi_loader: enable EFI_LOADER on arm1136 and arm1176
With an implementation for allow_unaligned() available for arm1136 and
arm1176 UEFI can be supported on these architectures.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
2019-11-19 12:10:22 +01:00
Heinrich Schuchardt
b20bb09b21 efi_loader: restrict EFI_LOADER to armv7 and armv8 on ARM
fatload USB was reported to fail on the Sheevaplug. Debugging showed that
this was caused by an incorrect unaligned write to memory in
path_to_uefi().

UEFI on ARM requires that unaligned memory access is enabled.

* ARMv5 does not support unaligned access at all.
* ARMv6 supports unaligned access when we clear the A flag and set the
  U flag.
* On ARMv7 unaligned access is possible when clearing the aligned flag,
  which we do in function allow_unaligned() (arch/arm/cpu/armv7/sctlr.S).
  For none of the other cpus in arch/arm/cpu/ we have implemented a
  similar function.
* ARMv8 allows unaligned access.

Let EFI_LOADER on ARM depend on SYS_CPU=armv7 or SYS_CPU=armv8.

Once we have implemented allow_unaligned() for other ARM CPUs we can add
these to Kconfig.

Reported-by: Gray Remlin <gryrmln@gmail.com>
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
2019-11-19 12:10:22 +01:00
Heinrich Schuchardt
246e601846 efi_loader: remove unused function efi_dp_from_dev()
Function efi_dp_from_dev() is not used anywhere. Remove it.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
2019-11-19 12:10:22 +01:00
Tom Rini
fd8adc33b8 Add OP-TEE test swuit
Fix patman cc_file output
 Minor sandbox/pinctrl changes
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Merge tag 'dm-pull-14nov19' of git://git.denx.de/u-boot-dm

Add OP-TEE test swuit
Fix patman cc_file output
Minor sandbox/pinctrl changes
2019-11-17 21:15:23 -05:00
Heiko Stuebner
6ccb05eae0 image: fdt: copy possible optee nodes to a loaded devicetree
The loading convention for optee or any other tee on arm64 is as bl32
parameter to the trusted-firmware. So TF-A gets invoked with the TEE as
bl32 and main u-boot as bl33. Once it has done its startup TF-A jumps
into the bl32 for the TEE startup, returns to TF-A and then jumps to bl33.

All of them get passed a devicetree as parameter and all components often
get loaded from a FIT image.

OP-TEE will create additional nodes in that devicetree namely a firmware
node and possibly multiple reserved-memory nodes.

While this devicetree is used in main u-boot, in most cases it won't be
the one passed to the actual kernel. Instead most boot commands will load
a new devicetree from somewhere like mass storage of the network, so if
that happens u-boot should transfer the optee nodes to that new devicetree.

To make that happen introduce optee_copy_fdt_nodes() called from the dt
setup function in image-fdt which after checking for the optee presence
in the u-boot dt will make sure a optee node is present in the kernel dt
and transfer any reserved-memory regions it can find.

Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
2019-11-14 07:09:34 -06:00
Heiko Stuebner
357d2ceba0 fdtdec: only create phandle if caller wants it in fdtdec_add_reserved_memory()
The phandlep pointer returning the phandle to the caller is optional
and if it is not set when calling fdtdec_add_reserved_memory() it is
highly likely that the caller is not interested in a phandle to the
created reserved-memory area and really just wants that area added.

So just don't create a phandle in that case.

Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2019-11-14 07:09:34 -06:00
Heiko Stuebner
086336a225 fdtdec: protect against another NULL phandlep in fdtdec_add_reserved_memory()
The change adding fdtdec_add_reserved_memory() already protected the added
phandle against the phandlep being NULL - making the phandlep var optional.

But in the early code checking for an already existing carveout this check
was not done and thus the phandle assignment could run into trouble,
so add a check there as well, which makes the function still return
successfully if a matching region is found, even though no-one wants to
work with the phandle.

Fixes: c9222a08b3 ("fdtdec: Implement fdtdec_add_reserved_memory()")
Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2019-11-14 07:09:34 -06:00
Heinrich Schuchardt
2e716b8e29 efi_selftest: enable all UEFI unit tests on the sandbox
As we can build relocation code for the sandbox now we should enable the
unit tests that had to be disabled up to now.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
2019-11-12 23:13:54 +01:00
Heinrich Schuchardt
3b4847cbee efi_loader: support building UEFI binaries on sandbox
On the sandbox the UEFI binaries must match the host architectures.

Adjust the Makefiles. Provide the PE/COFF header and relocation files.

Allow building helloworld.efi on the sandbox.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
2019-11-12 23:13:54 +01:00
Heinrich Schuchardt
7264e21fde efi_loader: call add_u_boot_and_runtime() on sandbox
On the sandbox we should mark the stack area as EFI runtime memory like we
do on any other architecture.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
2019-11-12 23:13:54 +01:00
AKASHI Takahiro
89cb6a5dd6 efi_loader: disk: install file system protocol to a whole disk
Currently, a whole disk without any partitions is not associated
with EFI_SIMPLE_FILE_SYSTEM_PROTOCOL. So even if it houses some
file system, there is a chance that we may not be able to access
it, particularly, when accesses are to be attempted after searching
that protocol against a device handle.

With this patch, EFI_SIMPLE_FILE_SYSTEM_PROTOCOL is installed
to such a disk if part_get_info() shows there is no partition
table installed on it.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>

Only if no partition table exists, check for a file system on disk level.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
2019-11-12 23:13:54 +01:00
Heinrich Schuchardt
cab6f06c14 efi_loader: fix efi_dp_from_name()
Correctly check the return value of efi_dp_from_file().
If we can determine device path for the file, should not depend on the
device path for the device being requested.
Provide a function description for efi_dp_from_name().

Reported-by: Coverity CID 273159, CID 273158
Fixes: 08c51fff30 ("efi_loader: device_path: check against file path length")
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
2019-11-12 23:13:54 +01:00
Simon Glass
f0921f5098 fdt: Sync up to the latest libfdt
Bring over the fdt from this commit:

430419c (origin/master) tests: fix some python warnings

adding in the 'assumptions' series designed to reduce code size.

Signed-off-by: Simon Glass <sjg@chromium.org>
2019-11-04 18:15:32 -07:00
Simon Glass
0d76afc032 fdt: Add Kconfig options to control code size
For better or worse libfdt recent grew a lot of code that checks the
validity of the device tree in great detail. When using unsigned or
unverified data this makes things safer, but it does add to code size.

Add some controls to select the trade-off between safety and code size.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
2019-11-04 18:15:32 -07:00
Tom Rini
24b77393a5 Pull request for UEFI sub-system for efi-2020-01-rc2
Provide a better user interface for setting UEFI variables.
 
 Bug fixes:
 - ext4 file system not discovered on UEFI block device
 - 'make tests' build error on 32bit systems
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Merge tag 'efi-2020-01-rc2' of https://gitlab.denx.de/u-boot/custodians/u-boot-efi

Pull request for UEFI sub-system for efi-2020-01-rc2

Provide a better user interface for setting UEFI variables.

Bug fixes:
- ext4 file system not discovered on UEFI block device
- 'make tests' build error on 32bit systems
2019-11-01 09:37:02 -04:00
Tom Rini
bb1bb4bb5d Fix for patman with email addresses containing commas
Bootstage improvements for TPL, SPL
 Various sandbox and dm improvements and fixes
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Merge tag 'dm-pull-29oct19' of git://git.denx.de/u-boot-dm

- Fix for patman with email addresses containing commas
- Bootstage improvements for TPL, SPL
- Various sandbox and dm improvements and fixes
2019-11-01 09:34:35 -04:00
Sam Protsenko
8f684b5a8b libavb: Fix build warnings after updating the lib
After updating libavb to most recent version from AOSP/master, two new
warnings appear:

Warning #1:

    lib/libavb/avb_cmdline.c: In function 'avb_append_options':
    lib/libavb/avb_cmdline.c:365:15: warning: 'dm_verity_mode' may be
                                     used uninitialized in this function
                                     [-Wmaybe-uninitialized]
         new_ret = avb_replace(
                   ^~~~~~~~~~~~
             slot_data->cmdline, "$(ANDROID_VERITY_MODE)", dm_verity_mode);
             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    lib/libavb/avb_cmdline.c:374:8: warning: 'verity_mode' may be used
                                    uninitialized in this function
                                    [-Wmaybe-uninitialized]
       if (!cmdline_append_option(
            ^~~~~~~~~~~~~~~~~~~~~~
               slot_data, "androidboot.veritymode", verity_mode)) {
               ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Warning #2:

    lib/libavb/avb_slot_verify.c: In function 'avb_slot_verify':
    lib/libavb/avb_slot_verify.c:1349:23: warning: 'ret' may be used
                                          uninitialized in this function
                                          [-Wmaybe-uninitialized]
       AvbSlotVerifyResult ret;
                           ^~~

Fix those by providing default return values to affected functions.

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
2019-10-31 07:22:53 -04:00
Sam Protsenko
4d579a4394 libavb: Update libavb to current AOSP master
Update libavb to commit 5fbb42a189aa in AOSP/master, because new version
has support for super partition [1], which we need for implementing
Android dynamic partitions. All changes from previous patches for libavb
in U-Boot are accounted for in this commit:
  - commit ecc6f6bea6 ("libavb: Handle wrong hashtree_error_mode in
                          avb_append_options()")
  - commit 897a1d947e ("libavb: Update SPDX tag style")
  - commit d8f9d2af96 ("avb2.0: add Android Verified Boot 2.0 library")

Tested on X15:

    ## Android Verified Boot 2.0 version 1.1.0
    read_is_device_unlocked not supported yet
    read_rollback_index not supported yet
    read_is_device_unlocked not supported yet
    Verification passed successfully
    AVB verification OK.

Unit test passes:

    $ ./test/py/test.py --bd sandbox --build -k test_avb

      test/py/tests/test_android/test_avb.py ss..s.

[1] 49936b4c01

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Reviewed-by: Eugeniu Rosca <rosca.eugeniu@gmail.com>
Acked-by: Igor Opaniuk <igor.opaniuk@gmail.com>
2019-10-31 07:22:53 -04:00
Marek Szyprowski
2ad98ab8f6 linux_compat: fix potential NULL pointer access
malloc_cache_aligned() might return zero, so fix potential NULL pointer
access if __GFP_ZERO flag is set.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Ralph Siemsen <ralph.siemsen@linaro.org>
2019-10-31 07:22:53 -04:00
Simon South
9b3fbb2b43 tiny-printf: Support vsnprintf()
Add a simple implementation of this function, to allow logging to be
enabled in the SPL or TPL for systems that rely on the tiny printf()
implementation.

To keep the code size small,

- The function is built only when logging is enabled, as it
  (currently) is not needed otherwise; and
- Like the existing implementation of snprintf(), its buffer-size
  parameter is ignored.

Signed-off-by: Simon South <simon@simonsouth.net>
2019-10-31 07:22:53 -04:00
Heinrich Schuchardt
eb5b63f369 lib: errno: sync error codes
Macro ERRNO_MSG() ignores the error number but we should still use the same
constants as in include/linux/errno.h.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
2019-10-31 07:22:53 -04:00
Heinrich Schuchardt
02e8a8241b lib: errno: check for unsupported error number
If errno_str() is called with an unsupported error number, do not return a
random pointer but a reasonable text.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
2019-10-31 07:22:53 -04:00