The variables are usually placed into an output region located in FLASH
memory when linking, but the variables are not marked `const`, so the
section ends up with `W` writeable section flag:
```bash
❯ arm-zephyr-eabi-readelf --section-headers build/zephyr/zephyr.elf | \
grep -E '(Section Headers:)|( \[Nr\])|(zephyr_dbg_info)'
Section Headers:
[Nr] Name Type Addr Off Size ES Flg Lk Inf Al
[10] zephyr_dbg_info PROGBITS 60012298 01238c 000040 00 WA 0 0 4
```
Set them as const to set the output section to read-only:
```bash
❯ arm-zephyr-eabi-readelf --section-headers build/zephyr/zephyr.elf | \
grep -E '(Section Headers:)|( \[Nr\])|(zephyr_dbg_info)'
Section Headers:
[Nr] Name Type Addr Off Size ES Flg Lk Inf Al
[10] zephyr_dbg_info PROGBITS 60012298 01238c 000040 00 A 0 0 4
```
Signed-off-by: Noah Pendleton <noah.pendleton@gmail.com>
When a thread is preempted on ARC, caller-saved registers
are saved on the stack automatically (RIRQ) or manually
by the kernel ISR (FIRQ).
Exposing the thread's relinquish cause hints the debugger
that it can read more or less register values.
Signed-off-by: Bruno Mendes <bd_mendes@outlook.com>
When FPU is enabled for Arm64, the saved_fp_context must be tracked by
thread info to visualize correctly the FPU context of threads.
Signed-off-by: Manuel Arguelles <manuel.arguelles@nxp.com>
Store the offset of mode_exc_return in the arch struct. This is required
to restore the link register to the original value, as `swap_helper.S`
saves the LSB to this field when `CONFIG_ARM_STORE_EXC_RETURN=y`.
Failing to account for this results in broken debugging when
`FPU_SHARING` or `ARM_NONSECURE_PREEMPTIBLE_SECURE_CALLS`.
Signed-off-by: Jordan Yates <jordan.yates@data61.csiro.au>
In order to bring consistency in-tree, migrate all subsystems 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>
OpenOCD is still using these alias, until we fix OpenOCD
upstream we should keep them.
This partially reverts commit
1a7bc06086.
Signed-off-by: Julien Massot <julien.massot@iot.bzh>
CONFIG_OPENOCD_SUPPORT was deprecated in favor of
CONFIG_DEBUG_THREAD_INFO in Zephyr v2.6.0 and can now be removed.
Signed-off-by: Maureen Helm <maureen.helm@intel.com>
MIPS (Microprocessor without Interlocked Pipelined Stages) is a
instruction set architecture (ISA) developed by MIPS Computer
Systems, now MIPS Technologies.
This commit provides MIPS architecture support to Zephyr. It is
compatible with the MIPS32 Release 1 specification.
Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Xtensa does not store the stack pointers in thread objects but
pushing the registers into the stack. There is no fixed location
to retrieve the stack pointer so mark it as unimplemented to
avoid the #warning.
Fixes#38405
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
The ARM64 port is currently using SP_EL0 for everything: kernel threads,
user threads and exceptions. In addition when taking an exception the
exception code is still using the thread SP without relying on any
interrupt stack.
If from one hand this makes the context switch really quick because the
thread context is already on the thread stack so we have only to save
one register (SP) for the whole context, on the other hand the major
limitation introduced by this choice is that if for some reason the
thread SP is corrupted or pointing to some unaccessible location (for
example in case of stack overflow), the exception code is unable to
recover or even deal with it.
The usual way of dealing with this kind of problems is to use a
dedicated interrupt stack on SP_EL1 when servicing the exceptions. The
real drawback of this is that, in case of context switch, all the
context must be copied from the shared interrupt stack into a
thread-specific stack or structure, so it is really slow.
We use here an hybrid approach, sacrificing a bit of stack space for a
quicker context switch. While nothing really changes for kernel threads,
for user threads we now use the privileged stack (already present to
service syscalls) as interrupt stack.
When an exception arrives the code now switches to use SP_EL1 that for
user threads is always pointing inside the privileged portion of the
stack of the current running thread. This achieves two things: (1)
isolate exceptions and syscall code to use a stack that is isolated,
privileged and not accessible to user threads and (2) the thread SP is
not touched at all during exceptions, so it can be invalid or corrupted
without any direct consequence.
Signed-off-by: Carlo Caione <ccaione@baylibre.com>
There's no need to duplicate the linker section for each architecture.
Instead, move the section declaration to common-rom.ld.
Signed-off-by: Carles Cufi <carles.cufi@nordicsemi.no>
The exported structures that were originally introduced for OpenOCD have
since then been reused for other debugger plugins, including PyOCD and
Segger J-Link.
Rename the Kconfig option and the implementation from openocd to debug
thread info, so that it reflects the fact that this is no longer
specifically tied to OpenOCD.
Signed-off-by: Carles Cufi <carles.cufi@nordicsemi.no>
