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Kernel: Use user stack for signal handlers.
This commit drastically changes how signals are handled. In the case that an unblocked thread is signaled it works much in the same way as previously. However, when a blocking syscall is interrupted, we set up the signal trampoline on the user stack, complete the blocking syscall, return down the kernel stack and then jump to the handler. This means that from the kernel stack's perspective, we only ever get one system call deep. The signal trampoline has also been changed in order to properly store the return value from system calls. This is necessary due to the new way we exit from signaled system calls.
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5 changed files with 104 additions and 122 deletions
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@ -141,7 +141,7 @@ public:
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int sys$lseek(int fd, off_t, int whence);
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int sys$kill(pid_t pid, int sig);
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[[noreturn]] void sys$exit(int status);
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[[noreturn]] void sys$sigreturn();
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int sys$sigreturn(RegisterDump& registers);
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pid_t sys$waitpid(pid_t, int* wstatus, int options);
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void* sys$mmap(const Syscall::SC_mmap_params*);
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int sys$munmap(void*, size_t size);
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