Le 19/06/2015 15:43, g...@uclinux.org a écrit : > From: Greg Ungerer <g...@uclinux.org> > > The action to potentially switch sp register is not occurring at the correct > point in the interrupt entry or exception exit sequences. > > For the interrupt entry case the sp on entry is used to create the stack > exception frame - but this may well be the user stack pointer, since we > haven't done the switch yet. Re-order the flow to switch the sp regs then > use the current sp to create the exception frame. > > For the return from exception case the code is unwinding the sp after > switching sp registers. But it should always unwind the supervisor sp > first, then carry out any required sp switch. > > Note that these problems don't effect operation unless the user sp bit is > set in the CACR register. Only a single sp is used in the default power up > state. Previously Linux only used this single sp mode. But modern versions > of Linux use the user sp mode now, so we need correct behavior for Linux > to work. > > Signed-off-by: Greg Ungerer <g...@uclinux.org> > Reviewed-by: Peter Crosthwaite <peter.crosthwa...@xilinx.com> > --- > target-m68k/op_helper.c | 7 +++---- > 1 file changed, 3 insertions(+), 4 deletions(-)
Reviewed-by: Laurent Vivier <laur...@vivier.eu>
