u-boot-brain/arch/mips/cpu
Gabor Juhos 14fdd1a8bf MIPS: start{, 64}.S: fill branch delay slots with NOP instructions
The romReserved and romExcHandle handlers are
accessed by a branch instruction however the
delay slots of those instructions are not filled.

Because the start.S uses the 'noreorder' directive,
the assembler will not fill the delay slots either,
and leads to the following assembly code:

  0000056c <romReserved>:
   56c:   1000ffff        b       56c <romReserved>

  00000570 <romExcHandle>:
   570:   1000ffff        b       570 <romExcHandle>

In the resulting code, the second branch instruction
is placed into the delay slot of the first branch
instruction, which is not allowed on the MIPS
architecture.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Cc: Daniel Schwierzeck <daniel.schwierzeck@googlemail.com>
2013-01-22 21:09:34 +01:00
..
mips32 MIPS: start{, 64}.S: fill branch delay slots with NOP instructions 2013-01-22 21:09:34 +01:00
mips64 MIPS: start{, 64}.S: fill branch delay slots with NOP instructions 2013-01-22 21:09:34 +01:00
xburst Merge branch 'master' of git://git.denx.de/u-boot-mips 2012-10-17 08:57:13 -07:00