Allow setting log level back to compile time value ...

When using the tf_log_set_max_level() function, one can dynamically
set the log level to a value smaller than then compile time specified
one, but not equal. This means that when the log level have been
lowered, it can't be reset to the previous value. This commit modifies
this function to allow setting the log level back to the compile time
value.

Fixes ARM-software/tf-issues#624

Change-Id: Ib157715c8835982ce4977ba67a48e18ff23d5a61
Signed-off-by: Junhan Zhou <Junhan@mellanox.com>

Merge pull request #1549 from danielboulby-arm/db/pointer ...

Remove rt_svc_descs pointer from global scope

Remove rt_svc_descs pointer from global scope ...

A pointer to rt_svc_desc_t is defined both in the function
handle_runtime_svc() and globally. Since the value of the
pointer RT_SVC_DESCS_START is defined by the linker and
never changes make this definition local in both
handle_runtime_svc() and runtime_svc_init() to reduce the
number of loads

Change-Id: Iea42c778d8599a26c87700009163b5a8d7d60be2
Signed-off-by: Daniel Boulby <daniel.boulby@arm.com>

Fix MISRA defects in log helpers ...

No functional changes.

Change-Id: I850f08718abb69d5d58856b0e3de036266d8c2f4
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>

backtrace: Introduce backtrace function ...

This function diplays the backtrace, the current EL and security state
to allow a post-processing tool to choose the right binary to interpret
the dump.

The output can be fed to GNU addr2line to resolve function names given
an ELF binary compiled with debug information. The "-i" flag is
recommended to improve display in case of inlined functions. The *.dump
files generated during the build process can also be used.

The function works in AArch64 and AArch32. In AArch32 it only works in
A32 mode (without T32 interworking), which is enforced in the Makefile.

Sample output of a backtrace at EL3:

    BACKTRACE: START: function_name
    0: EL3: 0x798
    1: EL3: 0x538
    2: EL3: 0x550
    3: EL3: 0x55c
    4: EL3: 0x568
    5: EL3: 0x5a8
    6: EL3: 0xf4
    BACKTRACE: END: function_name

In order to enable it the new option ENABLE_BACKTRACE must be set to 1.
This option is set to 1 by default only in AArch64 debug builds. As
usual, it can be overridden by the platform makefile and in the build
command line.

Change-Id: Icaff39b0e5188329728be2f3c72b868b2368e794
Co-authored-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
Signed-off-by: Douglas Raillard <douglas.raillard@arm.com>

libc: Move tf_printf and tf_snprintf to libc ...

Change their names to printf and snprintf. They are much smaller than
the previous versions we had, which makes them better suited for the
Trusted Firmware.

Change-Id: Ia872af91b7b967c47fce012eccecede7873a3daf
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>

tf_printf: Return number of printed characters ...

The C standard says that printf() has to return the number of characters
it has printed.

Change-Id: I0ef50b1d6766d140724ac0a2fa2c5d023431f984
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>

tf_snprintf: Add support for '%s' ...

Change-Id: Ia3a159444e638f63de7dc5a6a4b76169c757188a
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>

Add end_vector_entry assembler macro ...

Check_vector_size checks if the size of the vector fits
in the size reserved for it. This check creates problems in
the Clang assembler. A new macro, end_vector_entry, is added
and check_vector_size is deprecated.

This new macro fills the current exception vector until the next
exception vector. If the size of the current vector is bigger
than 32 instructions then it gives an error.

Change-Id: Ie8545cf1003a1e31656a1018dd6b4c28a4eaf671
Signed-off-by: Roberto Vargas <roberto.vargas@arm.com>

Fix MISRA Rule 5.3 Part 2 ...

Use a _ prefix for Macro arguments to prevent that argument from
hiding variables of the same name in the outer scope

Rule 5.3: An identifier declared in an inner scope shall not
          hide an identifier declared in an outer scope

Fixed For:
    make LOG_LEVEL=50 PLAT=fvp

Change-Id: I67b6b05cbad4aeca65ce52981b4679b340604708
Signed-off-by: Daniel Boulby <daniel.boulby@arm.com>

Fix MISRA Rule 5.3 Part 1 ...

Conflict with function name and variable name within that function.
Change the name of the function from image_size to get_image_size
to remove conflict and make the function fit the normal project
naming convention.

Rule 5.3:  An identifier declared in an inner scope shall not
           hide an identifier declared in an outer scope

Fixed For:
    make LOG_LEVEL=50 PLAT=fvp

Change-Id: I1a63d2730113e2741fffa79730459c584b0224d7
Signed-off-by: Daniel Boulby <daniel.boulby@arm.com>

Revert "Code change to fix small bugs"

Remove rt_svc_descs pointer from inner scope ...

A pointer to rt_svc_desc_t was defined both in the
function and globally. The innermost definition
hid the global definition which is the one we want
to use so remove the innermost definition to prevent
this

Change-Id: Idabdbc0947178ae83224bd17a9b170df7c278d51
Signed-off-by: Daniel Boulby <daniel.boulby@arm.com>

Allow disabling authentication dynamically ...

This patch allows platforms to dynamically disable authentication of
images during cold boot. This capability is controlled via the
DYN_DISABLE_AUTH build flag and is only meant for development
purposes.

Change-Id: Ia3df8f898824319bb76d5cc855b5ad6c3d227260
Signed-off-by: Soby Mathew <soby.mathew@arm.com>

Add support for the SMC Calling Convention 2.0 ...

Due to differences in the bitfields of the SMC IDs, it is not possible
to support SMCCC 1.X and 2.0 at the same time.

The behaviour of `SMCCC_MAJOR_VERSION` has changed. Now, it is a build
option that specifies the major version of the SMCCC that the Trusted
Firmware supports. The only two allowed values are 1 and 2, and it
defaults to 1. The value of `SMCCC_MINOR_VERSION` is derived from it.

Note: Support for SMCCC v2.0 is an experimental feature to enable
prototyping of secure partition specifications. Support for this
convention is disabled by default and could be removed without notice.

Change-Id: I88abf9ccf08e9c66a13ce55c890edea54d9f16a7
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>

Clean usage of void pointers to access symbols ...

Void pointers have been used to access linker symbols, by declaring an
extern pointer, then taking the address of it. This limits symbols
values to aligned pointer values. To remove this restriction an
IMPORT_SYM macro has been introduced, which declares it as a char
pointer and casts it to the required type.

Change-Id: I89877fc3b13ed311817bb8ba79d4872b89bfd3b0
Signed-off-by: Joel Hutton <Joel.Hutton@Arm.com>

Dynamic cfg: Do not populate args if already initialized ...

This patch modifies the common utility function
`populate_next_bl_params_config()` to only modify the entrypoint arguments
to an executable image only if they are not initialized earlier.
This issue was detected while testing Optee on ARM platforms which needed
the current arguments to be preserved in the absence of corresponding
config files.

Change-Id: I1e3fb4be8176fc173959e72442396dd33a99a316
Signed-off-by: Amit Daniel Kachhap <amit.kachhap@arm.com>
Signed-off-by: David Cunado <david.cunado@arm.com>

Fix MISRA rule 8.5 Part 1 ...

Rule 8.5: An external object or function shall be declared
          once in one and only one file.

Fixed for:
	make DEBUG=1 PLAT=fvp LOG_LEVEL=50 all

Change-Id: I2420c58134c280db90706cad2d5e7a190f9f9311
Signed-off-by: Roberto Vargas <roberto.vargas@arm.com>

Dynamic cfg: MISRA fixes ...

Change-Id: I1d85b76af002b8b672fcaeca94939b7420bc8243
Signed-off-by: Soby Mathew <soby.mathew@arm.com>

ARM Platforms: Load HW_CONFIG in BL2 ...

The patch adds the necessary changes to load HW_CONFIG in BL2 for
ARM Platforms :

1. The load address of HW_CONFIG is specified via the `hw_config_addr`
property in TB_FW_CONFIG is loaded by BL1. The `hw_config_max_size`
property defines the maximum size to be expected for the HW_CONFIG.
The `arm_dyn_cfg_helpers.c` and corresponding header implements
utility functions to parse these DT properties defined.
The `arm_dyn_cfg.c` implements wrappers to these helpers to enable
them to be invoked from ARM platform layer.

2. `HW_CONFIG` is added to the `bl2_mem_params_descs[]` array which is
the list of images to be loaded by BL2.

3. The `libfdt` sources are now included when BL2 is built

4. A new helper `populate_next_bl_params_config()` is introduced in
desc_image_load.c to populate the subsequent executable BL images
with the `hw_config` and the corresponding `fw_config` if available.
The `plat_get_next_bl_params()` API for ARM platforms is modified to
invoke this new helper.

5. The implementation of `bl2_early_platform_setup2()` is modified to
consider `arg0` as well in addition to `arg1` passed from BL1.

6. Bump up the BL2 size for Juno to accommodate the inclusion of libfdt.

Change-Id: I80f1554adec41753e0d179a5237364f04fe13a3f
Signed-off-by: Soby Mathew <soby.mathew@arm.com>

Dynamic cfg: Introduce fdt wrappers ...

Change-Id: I9b1cdaf2430a1998a69aa366ea1461224a3d43dc
Co-Authoured-by: Jeenu Viswambharan <Jeenu.Viswambharan@arm.com>
Signed-off-by: Soby Mathew <soby.mathew@arm.com>

image_decompress: add APIs for decompressing images ...

These APIs are used by platforms that need to decompress images.

image_decompress_init():
  This registers a temporary buffer and a decompressor callback.
  This should be called from platform init code.

image_decompress_prepare():
  This should be called before each compressed image is loaded.  The
  best location to call this will be bl*_plat_handle_pre_image_load().

image_decompress():
  This should be called after each compressed image is loaded.  The
  best location to call this will be bl*_plat_handle_post_image_load().

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

Add support to left-pad with zeroes in tf_printf ...

Add support to formats %i, %d, %p, %x and %u for left-padding numbers
with zeroes (e.g. `%08x`).

Change-Id: Ifd4795a82a8d83da2c00b44b9e482a2d9be797e3
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>

Unify cache flush code path after image load ...

Previously the cache flush happened in 2 different places in code
depending on whether TRUSTED_BOARD_BOOT is enabled or not. This
patch unifies this code path for both the cases. The `load_image()`
function is now made an internal static function.

Change-Id: I96a1da29d29236bbc34b1c95053e6a9a7fc98a54
Signed-off-by: Soby Mathew <soby.mathew@arm.com>

ARMv7 may not support Virtualization Extensions ...

ARMv7-A Virtualization extensions brings new instructions and resources
that were supported by later architectures. Reference ARM ARM Issue C.c
[DDI0406C_C].

ERET and extended MSR/MRS instructions, as specified in [DDI0406C_C] in
ID_PFR1 description of bits[15:12] (Virtualization Extensions):
 A value of 0b0001 implies implementation of the HVC, ERET, MRS
 (Banked register), and MSR (Banked register) instructions. The ID_ISARs
 do not identify whether these instructions are implemented.

UDIV/SDIV were introduced with the Virtualization extensions, even if
not strictly related to the virtualization extensions.

If ARMv7 based platform does not set ARM_CORTEX_Ax=yes, platform
shall define ARMV7_SUPPORTS_VIRTUALIZATION to enable virtualization
extension related resources.

Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>

Merge pull request #1153 from robertovargas-arm/fix-macros ...

Avoid use of undefined macros

Include debug.h in debug.S ...

debug.S was using macros defined in debug.h, but since it didn't
include it, these macros were taking the value 0, which means that
all the preprocessor conditionals were wrong.

Change-Id: If4ca81cc5a1662991589f914a2557ceff0eaaede
Signed-off-by: Roberto Vargas <roberto.vargas@arm.com>

Add platform hooks for boot redundancy support ...

These hooks are intended to allow one platform to try load
images from alternative places. There is a hook to initialize
the sequence of boot locations and a hook to pass to the next
sequence.

Change-Id: Ia0f84c415208dc4fa4f9d060d58476db23efa5b2
Signed-off-by: Roberto Vargas <roberto.vargas@arm.com>

Implement log framework ...

This patch gives users control over logging messages printed from the C
code using the LOG macros defined in debug.h Users now have the ability
to reduce the log_level at run time using the tf_log_set_max_level()
function. The default prefix string can be defined by platform by
overriding the `plat_log_get_prefix()` platform API which is also
introduced in this patch.

The new log framework results in saving of some RO data. For example,
when BL1 is built for FVP with LOG_LEVEL=LOG_LEVEL_VERBOSE, resulted
in saving 384 bytes of RO data and increase of 8 bytes of RW data. The
framework also adds about 108 bytes of code to the release build of FVP.

Fixes ARM-software/tf-issues#462

Change-Id: I476013d9c3deedfdd4c8b0b0f125665ba6250554
Co-authored-by: Eleanor Bonnici <Eleanor.bonnici@arm.com>
Signed-off-by: Soby Mathew <soby.mathew@arm.com>

Introduce tf_vprintf() and tf_string_print() ...

This patch introduces tf_vprintf() and tf_string_print() APIs
which is needed by the logging framework introduced in a later
patch.

Change-Id: Ie4240443d0e04e070502b51e371e546dd469fd33
Signed-off-by: Soby Mathew <soby.mathew@arm.com>