Soby Mathew c3260f9b82 Preserve x19-x29 across world switch for exception handling ... Previously exception handlers in BL3-1, X19-X29 were not saved and restored on every SMC/trap into EL3. Instead these registers were 'saved as needed' as a side effect of the A64 ABI used by the C compiler. That approach failed when world switching but was not visible with the TSP/TSPD code because the TSP is 64-bit, did not clobber these registers when running and did not support pre-emption by normal world interrupts. These scenarios showed that the values in these registers can be passed through a world switch, which broke the normal and trusted world assumptions about these registers being preserved. The Ideal solution saves and restores these registers when a world switch occurs - but that type of implementation is more complex. So this patch always saves and restores these registers on entry and exit of EL3. Fixes ARM-software/tf-issues#141 Change-Id: I9a727167bbc594454e81cf78a97ca899dfb11c27		2014-05-08 12:01:23 +01:00
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services	Reduce deep nesting of header files	2014-05-06 13:57:48 +01:00
bl31.h	Reduce deep nesting of header files	2014-05-06 13:57:48 +01:00
cm_macros.S	Preserve x19-x29 across world switch for exception handling	2014-05-08 12:01:23 +01:00
context.h	Preserve x19-x29 across world switch for exception handling	2014-05-08 12:01:23 +01:00
context_mgmt.h	Reduce deep nesting of header files	2014-05-06 13:57:48 +01:00
runtime_svc.h	Reduce deep nesting of header files	2014-05-06 13:57:48 +01:00