Mostly a revert of commit b1def7145f ("arch: deprecate `_current`").
This commit was part of PR #80716 whose initial purpose was about providing
an architecture specific optimization for _current. The actual deprecation
was sneaked in later on without proper discussion.
The Zephyr core always used _current before and that was fine. It is quite
prevalent as well and the alternative is proving rather verbose.
Furthermore, as a concept, the "current thread" is not something that is
necessarily architecture specific. Therefore the primary abstraction
should not carry the arch_ prefix.
Hence this revert.
Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
This adds support for the single-vector trapping (SVT) model, defined by
SPARC-V8 Embedded (V8E) Architecture Specification. SVT is available in
most LEON processors.
With single-vector trapping enabled, all traps are vectored through a
single trap vector (TBR.A) rather than one 16-byte entry for each trap
type. This improves memory utilization because the full 4 KiB trap table
is not needed.
This implementation uses a two-level of lookup table to find the handler
for the trap type (0..255).
- Execution time is constant.
- Condition flags are preserved.
- The implementation footprint is 60 bytes .text and 284 bytes .rodata.
For comparison, a non-SVT table is always 4096 .text.
Signed-off-by: Martin Åberg <martin.aberg@gaisler.com>
`_current` is now functionally equals to `arch_curr_thread()`, remove
its usage in-tree and deprecate it instead of removing it outright,
as it has been with us since forever.
Signed-off-by: Yong Cong Sin <ycsin@meta.com>
Signed-off-by: Yong Cong Sin <yongcong.sin@gmail.com>
Allow SoC to implement their custom per-core initialization function by
selecting `CONFIG_SOC_PER_CORE_INIT_HOOK` and implement
`soc_per_core_init_hook()`.
Signed-off-by: Maxim Adelman <imax@meta.com>
Signed-off-by: Yong Cong Sin <ycsin@meta.com>
Signed-off-by: Yong Cong Sin <yongcong.sin@gmail.com>
Do not use SYS_INIT for initializing irq_offload when enabled, instead
using a new interface that is called during the boot process for all
architectures.
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
Add a new call for initializing cache on architectures that need that.
Avoid using SYS_INIT for this and instead call the hook in a fixed place
and run if implemented.
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
Introduce soc and board hooks to replace arch specific code
and replace usages of SYS_INIT for platform initialization.
include/zephyr/platform/hooks.h introduces the hooks to be implemented
by boards and SoCs.
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
Created `GEN_OFFSET_STRUCT` & `GEN_NAMED_OFFSET_STRUCT` that
works for `struct`, and remove the use of `z_arch_esf_t`
completely.
Signed-off-by: Yong Cong Sin <ycsin@meta.com>
Make `struct arch_esf` compulsory for all architectures by
declaring it in the `arch_interface.h` header.
After this commit, the named struct `z_arch_esf_t` is only used
internally to generate offsets, and is slated to be removed
from the `arch_interface.h` header in the future.
Signed-off-by: Yong Cong Sin <ycsin@meta.com>
Namespaced the generated headers with `zephyr` to prevent
potential conflict with other headers.
Introduce a temporary Kconfig `LEGACY_GENERATED_INCLUDE_PATH`
that is enabled by default. This allows the developers to
continue the use of the old include paths for the time being
until it is deprecated and eventually removed. The Kconfig will
generate a build-time warning message, similar to the
`CONFIG_TIMER_RANDOM_GENERATOR`.
Updated the includes path of in-tree sources accordingly.
Most of the changes here are scripted, check the PR for more
info.
Signed-off-by: Yong Cong Sin <ycsin@meta.com>
It should be possible to disable exception debug, which is enabled by
default to reduce image size. Add missing guards now that the option is
cross architecture.
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
This commit re-implements the SPARC V8 ABI "Flush windows" software
trap. The trap is generated by C++ compilers for exceptions and also by
the C standard library function longjmp().
There were two issues with the previous implementation:
1. It did reads and writes via the stack pointer of the trap window,
which is not defined.
2. It executed with traps enabled but without the processor run-time
state set to safely handle traps. In particular there was no valid
stack for trap processing. Even though interrupt priority was set to
highest level, the behavior at other traps was not deterministic. For
example non-maskable interrupt (15) trap or bus error trap for
instruction fetch.
This new implementation does not store backup copies of CPU registers to
the stack, and it executes with traps disabled.
Fixes#63901
Signed-off-by: Martin Åberg <martin.aberg@gaisler.com>
CONFIG_COVERAGE has been incorrectly used to
change other kconfig options (stack sizes, etc)
code defaults, as well as some samples behaviour,
which should not have dependend on it.
Instead those should have depended on COVERAGE_GCOV,
which, being the one which adds special code and
temporary RAM storage for embedded targets,
require changes to many features.
When building for the native targets, all this was
unnecessary.
=> Fix the dependency.
Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>
Transfer the entry point and initial parameters in the callee_saved
struct rather than on the stack. This saves 48 byte stack per thread
and simplifies the logic.
Signed-off-by: Julius Barendt <julius.barendt@gaisler.com>
Assembler files were not migrated with the new <zephyr/...> prefix.
Note that the conversion has been scripted, refer to #45388 for more
details.
Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>
In order to bring consistency in-tree, migrate all arch code to the new
prefix <zephyr/...>. Note that the conversion has been scripted, refer
to zephyrproject-rtos#45388 for more details.
Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>
When XIP is not enabled, z_data_copy() already falls back to an empty
function. No need to ifdef it.
Signed-off-by: Carlo Caione <ccaione@baylibre.com>
For functions returning nothing, there is no need to document
with @return, as Doxgen complains about "documented empty
return type of ...".
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
Call into z_thread_usage_stop() before ISR entry to avoid including
interrupt handling totals in thread usage stats.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
This commit avoids enabling interrupts during Zephyr init.
Details:
Interrupts will be enabled only when the first thread starts or if
arch_irq_unlock() is called before that.
The logic is now:
1. Enable traps, disable interrupts globally
2. Initialize bss
3. Call _PrepC
Use in-place memset() to avoid register window overflow and underflow
traps. That is perhaps not the common scenario, but could happen with
memset() implementation which contains SAVE instructions on a system
with few register windows.
The second, and more important, item this commit addresses is that it
increases the processor interrupt level (priority) to highest. That
is, it enters _PrepC with all maskable interrupts levels disabled.
This fixes some cases where interrupts could be taken after
z_clock_driver_init() while the system was still initializing. That
seem to have occurred when clearing large thread stacks.
The third thing is that we now start out with current window pointer
0 (PSR.CWP=0) instead of 1. It has no practical implication except
for preparing for possible future support for systems with only
two windows.
Signed-off-by: Martin Åberg <martin.aberg@gaisler.com>
This commit implements the SPARC V8 ABI "Flush windows" software trap.
It enables support for C++ exceptions and longjmp().
Signed-off-by: Martin Åberg <martin.aberg@gaisler.com>
Both operands of an operator in which the usual arithmetic
conversions are performed shall have the same essential
type category.
Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>
The fatal log now contains
- Trap type in human readable representation
- Integer registers visible to the program when trap was taken
- Special register values such as PC and PSR
- Backtrace with PC and SP
If CONFIG_EXTRA_EXCEPTION_INFO is enabled, then all the above is
logged. If not, only the special registers are logged.
The format is inspired by the GRMON debug monitor and TSIM simulator.
A quick guide on how to use the values is in fatal.c.
It now looks like this:
E: tt = 0x02, illegal_instruction
E:
E: INS LOCALS OUTS GLOBALS
E: 0: 00000000 f3900fc0 40007c50 00000000
E: 1: 00000000 40004bf0 40008d30 40008c00
E: 2: 00000000 40004bf4 40008000 00000003
E: 3: 40009158 00000000 40009000 00000002
E: 4: 40008fa8 40003c00 40008fa8 00000008
E: 5: 40009000 f3400fc0 00000000 00000080
E: 6: 4000a1f8 40000050 4000a190 00000000
E: 7: 40002308 00000000 40001fb8 000000c1
E:
E: psr: f30000c7 wim: 00000008 tbr: 40000020 y: 00000000
E: pc: 4000a1f4 npc: 4000a1f8
E:
E: pc sp
E: #0 4000a1f4 4000a190
E: #1 40002308 4000a1f8
E: #2 40003b24 4000a258
Signed-off-by: Martin Åberg <martin.aberg@gaisler.com>
Introduce a new software trap 15 which is generated by the
ARCH_EXCEPT() function macro.
The handler for this software trap calls z_sparc_fatal_error() and
finally z_fatal_error() with "reason" and ESF as arguments.
Signed-off-by: Martin Åberg <martin.aberg@gaisler.com>
Unexpected software traps ("ta" instruction) are now handled by the
fatal exception handler and eventually end up in z_fatal_error().
Signed-off-by: Martin Åberg <martin.aberg@gaisler.com>
This patch replaces ENOSYS into ENOTSUP to keep consistency with
the return value specification of k_float_enable().
Signed-off-by: Katsuhiro Suzuki <katsuhiro@katsuster.net>
This patch introduce new API to enable FPU of thread. This is pair of
existed k_float_disable() API. And also add empty arch_float_enable()
into each architectures that have arch_float_disable(). The arc and
riscv already implemented arch_float_enable() so I do not touch
these implementations.
Motivation: Current Zephyr implementation does not allow to use FPU
on main and other system threads like as work queue. Users need to
create an other thread with K_FP_REGS for floating point programs.
Users can use FPU more easily if they can enable FPU on running
threads.
Signed-off-by: Katsuhiro Suzuki <katsuhiro@katsuster.net>
This reverts commit b6b6d39bb6.
With both commit 4690b8d5ec ("libc/minimal: fix malloc() allocated
memory alignment") and commit c822e0abbd ("libc/minimal: fix
realloc() allocated memory alignment") in place, there is no longer
a need for enforcing the big heap mode on every allocations.
Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
Write through switched_from in arch_switch() as required by the
switch protocol.
Also restructure the implementation to better match the template in
kernel_arch_interface.h, by removing a wrapper routine and instead
use CONTAINER_OF().
Fixes#32197
Signed-off-by: Martin Åberg <martin.aberg@gaisler.com>
This option allows forcing big heap mode. Useful on for getting 8-byte
aligned blocks on 32-bit machines.
Signed-off-by: Martin Åberg <martin.aberg@gaisler.com>
This change adds full shared floating point support for the SPARC
architecture.
All SPARC floating point registers are scratch registers with respect
to function call boundaries. That means we only have to save floating
point registers when switching threads in ISR. The registers are
stored to the corresponding thread stack.
FPU is disabled when calling ISR. Any attempt to use FPU in ISR
will generate the fp_disabled trap which causes Zephyr fatal error.
- This commit adds no new thread state.
- All FPU contest save/restore is synchronous and lazy FPU context
switch is not implemented.
Signed-off-by: Martin Åberg <martin.aberg@gaisler.com>
With this change we allocate stack space only for the registers we
actually store in the thread interrupt stack frame.
Furthermore, no function is called on with the interrupt context save
frame %sp so no full frame is needed here. ABI functions are called
later in the interrupt trap handler, but that is after the dedicated
interrupt stack has been installed.
This saves 96 bytes of stack space for each interrupted context.
Signed-off-by: Martin Åberg <martin.aberg@gaisler.com>
The input registers (i0..i7) are not modified by the interrupt trap
handler and are preserved by function calls. So we do not need to
store them in the interrupt stack frame.
This saves 48 bytes of stack space for each interrupted context,
and eliminates 4 double word stores and 4 double word loads.
Signed-off-by: Martin Åberg <martin.aberg@gaisler.com>
Most of kernel files where declaring os module without providing
log level. Because of that default log level was used instead of
CONFIG_KERNEL_LOG_LEVEL.
Signed-off-by: Krzysztof Chruscinski <krzysztof.chruscinski@nordicsemi.no>
This commit implements the architecture specific parts for the
Zephyr tracing subsystem on SPARC and LEON3. It does so by calling
sys_trace_isr_enter(), sys_trace_isr_exit() and sys_trace_idle().
The logic for the ISR tracing is:
1. switch to interrupt stack
2. *call sys_trace_isr_enter()* if CONFIG_TRACING_ISR
3. call the interrupt handler
4. *call sys_trace_isr_exit()* if CONFIG_TRACING_ISR
5. switch back to thread stack
Signed-off-by: Martin Åberg <martin.aberg@gaisler.com>
Adds the necessary bits to initialize TLS in the stack
area and sets up CPU registers during context switch. Register g7 is
used to point to the thread data. Thread data is accessed with negative
offsets from g7.
Signed-off-by: Martin Åberg <martin.aberg@gaisler.com>
SPARC is an open and royalty free processor architecture.
This commit provides SPARC architecture support to Zephyr. It is
compatible with the SPARC V8 specification and the SPARC ABI and is
independent of processor implementation.
Functionality specific to SPRAC processor implementations should
go in soc/sparc. One example is the LEON3 SOC which is part of this
patch set.
The architecture port is fully SPARC ABI compatible, including trap
handlers and interrupt context.
Number of implemented register windows can be configured.
Some SPARC V8 processors borrow the CASA (compare-and-swap) atomic
instructions from SPARC V9. An option has been defined in the
architecture port to forward the corresponding code-generation option
to the compiler.
Stack size related config options have been defined in sparc/Kconfig
to match the SPARC ABI.
Co-authored-by: Nikolaus Huber <nikolaus.huber.melk@gmail.com>
Signed-off-by: Martin Åberg <martin.aberg@gaisler.com>
Nicolas Pitre
Martin Åberg
Yong Cong Sin
Yong Cong Sin
Anas Nashif
Alberto Escolar Piedras
Peter Mitsis
Julius Barendt
Gerard Marull-Paretas
Nazar Kazakov
Carles Cufi
Carlo Caione
Daniel Leung
Andy Ross
Flavio Ceolin
Katsuhiro Suzuki
Krzysztof Chruscinski