aboutsummaryrefslogtreecommitdiff
path: root/arch/um/sys-x86_64/stub_segv.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/um/sys-x86_64/stub_segv.c')
-rw-r--r--arch/um/sys-x86_64/stub_segv.c31
1 files changed, 31 insertions, 0 deletions
diff --git a/arch/um/sys-x86_64/stub_segv.c b/arch/um/sys-x86_64/stub_segv.c
new file mode 100644
index 00000000000..161d1fe9c03
--- /dev/null
+++ b/arch/um/sys-x86_64/stub_segv.c
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2004 Jeff Dike (jdike@addtoit.com)
+ * Licensed under the GPL
+ */
+
+#include <signal.h>
+#include <linux/compiler.h>
+#include <asm/unistd.h>
+#include "uml-config.h"
+#include "sysdep/sigcontext.h"
+#include "sysdep/faultinfo.h"
+
+void __attribute__ ((__section__ (".__syscall_stub")))
+stub_segv_handler(int sig)
+{
+ struct ucontext *uc;
+
+ __asm__("movq %%rdx, %0" : "=g" (uc) :);
+ GET_FAULTINFO_FROM_SC(*((struct faultinfo *) UML_CONFIG_STUB_DATA),
+ &uc->uc_mcontext);
+
+ __asm__("movq %0, %%rax ; syscall": : "g" (__NR_getpid));
+ __asm__("movq %%rax, %%rdi ; movq %0, %%rax ; movq %1, %%rsi ;"
+ "syscall": : "g" (__NR_kill), "g" (SIGUSR1));
+ /* Two popqs to restore the stack to the state just before entering
+ * the handler, one pops the return address, the other pops the frame
+ * pointer.
+ */
+ __asm__("popq %%rax ; popq %%rax ; movq %0, %%rax ; syscall" : : "g"
+ (__NR_rt_sigreturn));
+}