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The kernel has different handling for syscalls with invalid numbers that are in the "arm-specific" range 0x9f0000 and up: * 0x9f0000..0x9f07ff return -ENOSYS if not implemented * other out of range syscalls cause a SIGILL (see the kernel's arch/arm/kernel/traps.c:arm_syscall()) Implement this distinction. (Note that our code doesn't look quite like the kernel's, because we have removed the 0x900000 prefix by this point, whereas the kernel retains it in arm_syscall().) Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-id: 20200420212206.12776-4-peter.maydell@linaro.org