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Add some basic signal support.
It only works for sending a signal to a process that's in userspace code. We implement reception by synthesizing a PUSHA+PUSHF in the receiving process (operating on values in the TSS.) The TSS CS:EIP is then rerouted to the signal handler and a tiny return trampoline is constructed in a dedicated region in the receiving process. Also hacked up /bin/kill to be able to send arbitrary signals (kill -N PID)
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13 changed files with 240 additions and 30 deletions
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#define ALWAYS_INLINE inline __attribute__ ((always_inline))
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#define __NORETURN __attribute__ ((noreturn))
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#define __MALLOC __attribute__ ((malloc))
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#ifdef __cplusplus
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#define __BEGIN_DECLS extern "C" {
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