1. Change prototype of trapsignal and sendsig to use ksiginfo_t *, most

   changes in MD code are trivial, before this change, trapsignal and
   sendsig use discrete parameters, now they uses member fields of
   ksiginfo_t structure. For sendsig, this change allows us to pass
   POSIX realtime signal value to user code.

2. Remove cpu_thread_siginfo, it is no longer needed because we now always
   generate ksiginfo_t data and feed it to libpthread.

3. Add p_sigqueue to proc structure to hold shared signals which were
   blocked by all threads in the proc.

4. Add td_sigqueue to thread structure to hold all signals delivered to
   thread.

5. i386 and amd64 now return POSIX standard si_code, other arches will
   be fixed.

6. In this sigqueue implementation, pending signal set is kept as before,
   an extra siginfo list holds additional siginfo_t data for signals.
   kernel code uses psignal() still behavior as before, it won't be failed
   even under memory pressure, only exception is when deleting a signal,
   we should call sigqueue_delete to remove signal from sigqueue but
   not SIGDELSET. Current there is no kernel code will deliver a signal
   with additional data, so kernel should be as stable as before,
   a ksiginfo can carry more information, for example, allow signal to
   be delivered but throw away siginfo data if memory is not enough.
   SIGKILL and SIGSTOP have fast path in sigqueue_add, because they can
   not be caught or masked.
   The sigqueue() syscall allows user code to queue a signal to target
   process, if resource is unavailable, EAGAIN will be returned as
   specification said.
   Just before thread exits, signal queue memory will be freed by
   sigqueue_flush.
   Current, all signals are allowed to be queued, not only realtime signals.

Earlier patch reviewed by: jhb, deischen
Tested on: i386, amd64

1 files changed, 6 insertions, 1 deletions

diff --git a/sys/amd64/ia32/ia32_syscall.c b/sys/amd64/ia32/ia32_syscall.c
index f159cfb..93d4e16 100644
--- a/sys/amd64/ia32/ia32_syscall.c
+++ b/sys/amd64/ia32/ia32_syscall.c
@@ -101,6 +101,7 @@ ia32_syscall(struct trapframe frame)
 	u_int32_t args[8];
 	u_int64_t args64[8];
 	u_int code;
+	ksiginfo_t ksi;
 
 	/*
 	 * note: PCPU_LAZY_INC() can only be used if we can afford
@@ -227,7 +228,11 @@ ia32_syscall(struct trapframe frame)
 	 */
 	if (orig_tf_rflags & PSL_T) {
 		frame.tf_rflags &= ~PSL_T;
-		trapsignal(td, SIGTRAP, 0);
+		ksiginfo_init_trap(&ksi);
+		ksi.ksi_signo = SIGTRAP;
+		ksi.ksi_code = TRAP_TRACE;
+		ksi.ksi_addr = (void *)frame.tf_rip;
+		trapsignal(td, &ksi);
 	}
 
 	/*