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src/rtos/eCos : Support per-build configuration specific structure layouts 

Extended feature. This is a large patch, but is self-contained to the
eCos support and does not affect any other openocd functionality. It
does NOT affect existing eCos RTOS plugin users where their
applications do not provide the extended symbolic helper
information. If the helper symbols are not available the rtos support
code will behave as before. This "dynamic" functionality is *required*
because eCos does NOT have a fixed/hardwired, known, layout for the
thread descriptor structure. The per-application build eCos
configuration can affect the shape of the thread descriptor structure
(field presence, and hence offsets of subsequent fields) such that
constant values cannot be used to consistently interpret all possible
eCos application configurations. For historical reasons, there is not
yet a consistent namespace for the helper symbols across eCos HALs
hence the support is currently limited to specific architectures
(Cortex-M and ARM/Cortex-A). No new Clang analyser warnings are raised
by this changeset.

Change-Id: Ib3a36877326eeb56595cbca55e21b9e59a59c98a
Signed-off-by: James G. Smith <jsmith@rallysmith.co.uk>
Reviewed-on: https://review.openocd.org/c/openocd/+/6275
Reviewed-by: Alex Schuilenburg <alex.schuilenburg@gmail.com>
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
Tested-by: jenkins
This commit is contained in:
James G. Smith 2021-05-26 10:08:26 +01:00 committed by Antonio Borneo
parent 9a7781ff8c
commit d96dc47ef6
2 changed files with 952 additions and 92 deletions
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1037
src/rtos/eCos.c
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7
src/rtos/rtos_ecos_stackings.c
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@ -8,6 +8,13 @@
#include "rtos_standard_stackings.h"
#include "target/armv7m.h"
/* For Cortex-M eCos applications the actual thread context register layout can
* be different between active threads of an application depending on whether
* the FPU is in use, configured for lazy FPU context saving, etc. */
/* Default fixed thread register context description used for older eCos
* application builds without the necessary symbolic information describing the
* actual configuration-dependent offsets. */
static const struct stack_register_offset rtos_ecos_cortex_m3_stack_offsets[ARMV7M_NUM_CORE_REGS] = {
{ ARMV7M_R0, 0x0c, 32 }, /* r0 */
{ ARMV7M_R1, 0x10, 32 }, /* r1 */