Kernel: Add support for SA_SIGINFO

kernel/arch/i686/Signal.S

@@ -2,15 +2,41 @@
 
 // stack contains
 //    return address
+//    return stack
+//    return rflags
+//    siginfo_t
 //    signal number
 //    signal handler
 
 .global signal_trampoline
 signal_trampoline:
-	pusha
+	pushl %esi // gregs
+	pushl %edi
+	pushl %edx
+	pushl %ecx
+	pushl %ebx
+	pushl %eax
+	pushl %ebp
 
-	movl 40(%esp), %edi
-	movl 36(%esp), %eax
+	movl 76(%esp), %eax // return sp
+	addl $4, %eax       //   return address
+	movl 80(%esp), %ebx // return ip
+	pushl %eax;
+	pushl %ebx
+
+	// FIXME: populate these
+	xorl %eax, %eax
+	pushl %eax // stack
+	pushl %eax
+	pushl %eax
+	pushl %eax // sigset
+	pushl %eax
+	pushl %eax // link
+
+	movl    %esp,  %edx // ucontext
+	leal 68(%esp), %esi // siginfo
+	movl 64(%esp), %edi // signal number
+	movl 60(%esp), %eax // handlers
 
 	// align stack to 16 bytes
 	movl %esp, %ebp
@@ -19,7 +45,9 @@ signal_trampoline:
 	subl $512, %esp
 	fxsave (%esp)
 
-	subl $12, %esp
+	subl $4, %esp
+	pushl %edx
+	pushl %esi
 	pushl %edi
 	call *%eax
 	addl $16, %esp
@@ -29,9 +57,21 @@ signal_trampoline:
 
 	// restore stack
 	movl %ebp, %esp
-	popa
+	addl $32, %esp
 
-	addl $8, %esp
+	// restore registers
+	popl %ebp
+	popl %eax
+	popl %ebx
+	popl %ecx
+	popl %edx
+	popl %edi
+	popl %esi
+
+	// skip handler, number, siginfo_t
+	addl $44, %esp
+
+	// restore flags
 	popf
 
 	movl (%esp), %esp