rockbox/lib/unwarminder/safe_read.S, branch master

Fix return address when data_abort_handler skips faulting instruction.

2013-05-23T23:51:19+00:00

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

unwarminder: fix data_abort_handler (wrong address to UIE)

2012-06-07T12:48:43+00:00

Change-Id: I060735363f2e408c42a8e11ac1f31dc96e3cb2d6

arm: implement safe reads by intercepting the data abort handler.

2012-04-06T11:48:09+00:00

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