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3 commits

Author SHA1 Message Date
Boris Gjenero
4077eac839 Fix return address when data_abort_handler skips faulting instruction. 
When writing a value to PC, execution continues at that location,
so subtracting 4 returns to the next instruction. Previously, two
instructions after the faulting instruction were being skipped, causing
safe_read functions to return true even if a data abort happened.

Change-Id: I3fd02d54646323ea2050d0504e38f6d22f09c749
 2013-05-23 19:51:19 -04:00
Amaury Pouly
1a4fa1603b unwarminder: fix data_abort_handler (wrong address to UIE) 
Change-Id: I060735363f2e408c42a8e11ac1f31dc96e3cb2d6
 2012-06-07 14:48:43 +02:00
Amaury Pouly
d4674ed3b7 arm: implement safe reads by intercepting the data abort handler. 
Implement functions to read from a memory location and indicate
failure in case this is not possible. Since we do not have a MMU,
intercept the data abort handler and simply return when the abort
comes from the safe read routines.

Change-Id: I08f2e59898dcac893319a8150d4cf626f3adabbd
Reviewed-on: http://gerrit.rockbox.org/207
Reviewed-by: Marcin Bukat <marcin.bukat@gmail.com>
 2012-04-06 13:48:09 +02:00