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target_resume() doxygen 

Add doxygen for target_resume() ... referencing the still-unresolved
confusion about what the "debug_execution" parameter means (not all
CPU support code acts the same).

The 'handle_breakpoints" param seems to have resolved the main issue
with its semantics, but it wasn't part of the function spec before.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
This commit is contained in:
David Brownell 2010-03-02 15:45:12 -08:00
parent 53b3d4dd53
commit d72e90ae4b
1 changed files with 33 additions and 3 deletions
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36
src/target/target.c
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@ -424,6 +424,36 @@ int target_halt(struct target *target)
return ERROR_OK; return ERROR_OK;
} }
/**
* Make the target (re)start executing using its saved execution
* context (possibly with some modifications).
*
* @param target Which target should start executing.
* @param current True to use the target's saved program counter instead
* of the address parameter
* @param address Optionally used as the program counter.
* @param handle_breakpoints True iff breakpoints at the resumption PC
* should be skipped. (For example, maybe execution was stopped by
* such a breakpoint, in which case it would be counterprodutive to
* let it re-trigger.
* @param debug_execution False if all working areas allocated by OpenOCD
* should be released and/or restored to their original contents.
* (This would for example be true to run some downloaded "helper"
* algorithm code, which resides in one such working buffer and uses
* another for data storage.)
*
* @todo Resolve the ambiguity about what the "debug_execution" flag
* signifies. For example, Target implementations don't agree on how
* it relates to invalidation of the register cache, or to whether
* breakpoints and watchpoints should be enabled. (It would seem wrong
* to enable breakpoints when running downloaded "helper" algorithms
* (debug_execution true), since the breakpoints would be set to match
* target firmware being debugged, not the helper algorithm.... and
* enabling them could cause such helpers to malfunction (for example,
* by overwriting data with a breakpoint instruction. On the other
* hand the infrastructure for running such helpers might use this
* procedure but rely on hardware breakpoint to detect termination.)
*/
int target_resume(struct target *target, int current, uint32_t address, int handle_breakpoints, int debug_execution) int target_resume(struct target *target, int current, uint32_t address, int handle_breakpoints, int debug_execution)
{ {
int retval; int retval;
@ -435,9 +465,9 @@ int target_resume(struct target *target, int current, uint32_t address, int hand
return ERROR_FAIL; return ERROR_FAIL;
} }
/* note that resume *must* be asynchronous. The CPU can halt before we poll. The CPU can /* note that resume *must* be asynchronous. The CPU can halt before
* even halt at the current PC as a result of a software breakpoint being inserted by (a bug?) * we poll. The CPU can even halt at the current PC as a result of
* the application. * a software breakpoint being inserted by (a bug?) the application.
*/ */
if ((retval = target->type->resume(target, current, address, handle_breakpoints, debug_execution)) != ERROR_OK) if ((retval = target->type->resume(target, current, address, handle_breakpoints, debug_execution)) != ERROR_OK)
return retval; return retval;