Porting guide: Clarify API that don't follow AAPCS
This patch clarifies a porting API in the Porting Guide that do not
follow the ARM Architecture Program Calling Standards (AAPCS). The
list of registers that are allowed to be clobbered by this API has
been updated in the Porting Guide.

Fixes ARM-software/tf-issues#259

Change-Id: Ibf2adda2e1fb3e9b8f53d8a918d5998356eb8fce
1 parent dbc8071 commit e5846732e36272a7a387f088092becd0d46461b5
@Antonio Nino Diaz Antonio Nino Diaz authored on 8 Feb 2016
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docs/porting-guide.md