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rtos: turn stack alignment into a function pointer

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Some targets (Cortex M) require more complicated calculations for
turning the stored stack pointer back into a process stack pointer.
For example, the Cortex M stores a bit in the auto-stacked xPSR
indicating that alignment had to be performed and an additional 4
byte padding is present before the exception stacking.  This change
only sets up the framework for Cortex-M unstacking and does not
add Cortex-M support.

Note: this also fixes the alignment calculation nearly addressed by
change #2301 entitled rtos/rtos.c: fix stack alignment calculation.
Updated calculation is in rtos_generic_stack_align.

Change-Id: I0f662cad0df81cbe5866219ad0fef980dcb3e44f
Signed-off-by: Andrew Ruder <andrew.ruder@elecsyscorp.com>
Cc: Paul Fertser <fercerpav@gmail.com>
Cc: Andreas Fritiofson <andreas.fritiofson@gmail.com>
Cc: Evan Hunter <evanhunter920@gmail.com>
Cc: Jon Burgess <jburgess777@gmail.com>
Reviewed-on: http://openocd.zylin.com/3002
Reviewed-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>
Tested-by: jenkins
This commit is contained in:
Andrew Ruder
2015-10-05 13:51:10 -05:00
committed by Freddie Chopin
parent ddc3317c54
commit 9413a7a814
9 changed files with 58 additions and 18 deletions
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src/rtos/rtos_standard_stackings.h
+3
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@@ -30,5 +30,8 @@
extern const struct rtos_register_stacking rtos_standard_Cortex_M3_stacking;
extern const struct rtos_register_stacking rtos_standard_Cortex_R4_stacking;
extern const struct rtos_register_stacking rtos_standard_NDS32_N1068_stacking;
int64_t rtos_generic_stack_align8(struct target *target,
const uint8_t *stack_data, const struct rtos_register_stacking *stacking,
int64_t stack_ptr);
#endif /* ifndef INCLUDED_RTOS_STANDARD_STACKINGS_H_ */