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In the ARM v6 architecture, 'sub pc, pc, 1' is not an interworking branch, so the computed new value is written to r15 as a normal value. The architecture says that in this case, bits [1:0] of the value written must be ignored if we are in ARM mode (or bit [0] ignored if in Thumb mode); this is a change from the ARMv4/v5 specification that behaviour is UNPREDICTABLE. Use the correct mask on the PC value when doing a non-interworking store to PC. A popular library used on RaspberryPi uses this instruction as part of a trick to determine whether it is running on ARMv6 or ARMv7, and we were mishandling the sequence. Fixes bug: https://bugs.launchpad.net/bugs/1625295 Reported-by: <stu.axon@gmail.com> Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Message-id: 1474380941-4730-1-git-send-email-peter.maydell@linaro.org |
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.. | ||
arch_dump.c | ||
arm_ldst.h | ||
arm-powerctl.c | ||
arm-powerctl.h | ||
arm-semi.c | ||
cpu64.c | ||
cpu-qom.h | ||
cpu.c | ||
cpu.h | ||
crypto_helper.c | ||
gdbstub64.c | ||
gdbstub.c | ||
helper-a64.c | ||
helper-a64.h | ||
helper.c | ||
helper.h | ||
internals.h | ||
iwmmxt_helper.c | ||
kvm32.c | ||
kvm64.c | ||
kvm_arm.h | ||
kvm-consts.h | ||
kvm-stub.c | ||
kvm.c | ||
machine.c | ||
Makefile.objs | ||
monitor.c | ||
neon_helper.c | ||
op_addsub.h | ||
op_helper.c | ||
psci.c | ||
translate-a64.c | ||
translate.c | ||
translate.h |