refactor syscall into an array and move number into arch depend files #189
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This PR refactor syscall handling to simplify the process of adding new ones. This is in the goal of supporting native musl library.
For that, an array (syscall_table) is used to contains the callback to use for a given syscall number. This remove the need of the switch to select the correct function.
Macros are also added to declare and define syscall function. They declare two functions
__sys_SYSCALL_NAMEanddo_SYSCALL_NAME. The first one is also implemented and just calldo_SYSCALL_NAMEwith casting each arguments to the correct type. They are inspired by Linux one's (see include/linux/syscalls.h in Linux sources).The syscalls number are also moved into a per arch depend file. For now, the number are the same between the two archs, but to support native musl, different number will be needed (e.g. exit is 1 on arm32 and 93 on aarch64). This will be done futur work.