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In the v8M architecture, if the process of taking an exception results in a further exception this is called a derived exception (for example, an MPU exception when writing the exception frame to memory). If the derived exception happens while pushing the initial stack frame, we must ignore any subsequent possible exception pushing the callee-saves registers. In preparation for making the stack writes check for exceptions, add a return value from v7m_push_stack() and a new parameter to v7m_exception_taken(), so that the former can tell the latter that it needs to ignore failures to write to the stack. We also plumb the argument through to v7m_push_callee_stack(), which is where the code to ignore the failures will be. (Note that the v8M ARM pseudocode structures this slightly differently: derived exceptions cause the attempt to process the original exception to be abandoned; then at the top level it calls DerivedLateArrival to prioritize the derived exception and call TakeException from there. We choose to let the NVIC do the prioritization and continue forward with a call to TakeException which will then take either the original or the derived exception. The effect is the same, but this structure works better for QEMU because we don't have a convenient top level place to do the abandon-and-retry logic.) Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-id: 1517324542-6607-4-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 | ||
| trace-events | ||
| translate-a64.c | ||
| translate.c | ||
| translate.h | ||