[Qemu-devel] [RFC] [PATCH 0/5] linux-user: refactor do_syscall()

[riku.voipio@linaro.org]

From: Riku Voipio <riku.voipio@linaro.org>

Currently linux-user handles system calls with a 3000+ line switch/case construct
in do_syscall(). Some syscalls are implemented inline in the switch/case, others
as separate functions, and the rest as mix of both.

As the first step of the cleanup, I'd like to move implementation of each syscall
completely to their own functions. While at it, we define more standard interface between
do_syscall() and the functions implementing the system calls: system call functions take
parameter as raw abi_long, and leave the host to target errno conversion to do_syscall.

Once all syscall are converted to separate functions, we can convert to switch/case to
a table with syscall structs pointing to syscall implementation as well the strace definitions
currently in strace.list.

Before I proceed to convert all 300+ syscalls implemented, I'd like to hear if people think
it is a good idea, or if you have some improvements to suggest. To see how it would look in
practice, here are the first five syscalls cleaned up.

Riku Voipio (5):
  linux-user: move exit to own function
  linux-user: move read to own function
  linux-user: move write to own function
  linux-user: complete do_open function isolation
  linux-user: do_openat wrapper added

 linux-user/syscall.c |  182 +++++++++++++++++++++++++++++---------------------
 1 file changed, 106 insertions(+), 76 deletions(-)

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1.7.9.5