From 8f8555f868039017a03d93c325865170ce0fe71c Mon Sep 17 00:00:00 2001
From: Matthew Dillon <dillon@apollo.backplane.com>
Date: Thu, 28 Jul 2011 16:19:29 -0700
Subject: [PATCH] vkernel - Add SIGINFO support (experimental)

* Display the lwp id and the pc and sp of the thread.
---
 sys/platform/vkernel/i386/exception.c     | 17 +++++++++++++++++
 sys/platform/vkernel64/x86_64/exception.c | 17 +++++++++++++++++
 2 files changed, 34 insertions(+)

diff --git a/sys/platform/vkernel/i386/exception.c b/sys/platform/vkernel/i386/exception.c
index 8b770ef4fa..a866b41948 100644
--- a/sys/platform/vkernel/i386/exception.c
+++ b/sys/platform/vkernel/i386/exception.c
@@ -54,6 +54,7 @@
 
 #include <err.h>
 #include <signal.h>
+#include <stdio.h>
 #include <unistd.h>
 
 int _ucodesel = LSEL(LUCODE_SEL, SEL_UPL);
@@ -140,6 +141,20 @@ iosig(int nada, siginfo_t *info, void *ctxp)
 
 #endif
 
+static
+void
+infosig(int nada, siginfo_t *info, void *ctxp)
+{
+       ucontext_t *ctx = ctxp;
+       char buf[256];
+
+       snprintf(buf, sizeof(buf), "lwp %d pc=%p sp=%p\n",
+               (int)lwp_gettid(),
+               (void *)(intptr_t)ctx->uc_mcontext.mc_eip,
+               (void *)(intptr_t)ctx->uc_mcontext.mc_esp);
+       write(2, buf, strlen(buf));
+}
+
 void
 init_exceptions(void)
 {
@@ -168,6 +183,8 @@ init_exceptions(void)
 	sa.sa_sigaction = iosig;
 	sigaction(SIGIO, &sa, NULL);
 #endif
+	sa.sa_sigaction = infosig;
+	sigaction(SIGINFO, &sa, NULL);
 }
 
 /*
diff --git a/sys/platform/vkernel64/x86_64/exception.c b/sys/platform/vkernel64/x86_64/exception.c
index 34ef724984..cb266e366f 100644
--- a/sys/platform/vkernel64/x86_64/exception.c
+++ b/sys/platform/vkernel64/x86_64/exception.c
@@ -54,6 +54,7 @@
 
 #include <err.h>
 #include <signal.h>
+#include <stdio.h>
 #include <unistd.h>
 
 int _ucodesel = GSEL(GUCODE_SEL, SEL_UPL);
@@ -145,6 +146,20 @@ iosig(int nada, siginfo_t *info, void *ctxp)
 
 #endif
 
+static
+void
+infosig(int nada, siginfo_t *info, void *ctxp)
+{
+	ucontext_t *ctx = ctxp;
+	char buf[256];
+
+	snprintf(buf, sizeof(buf), "lwp %d pc=%p sp=%p\n",
+		(int)lwp_gettid(),
+		(void *)(intptr_t)ctx->uc_mcontext.mc_rip,
+		(void *)(intptr_t)ctx->uc_mcontext.mc_rsp);
+	write(2, buf, strlen(buf));
+}
+
 void
 init_exceptions(void)
 {
@@ -173,6 +188,8 @@ init_exceptions(void)
 	sa.sa_sigaction = iosig;
 	sigaction(SIGIO, &sa, NULL);
 #endif
+	sa.sa_sigaction = infosig;
+	sigaction(SIGINFO, &sa, NULL);
 }
 
 /*
-- 
2.41.0