1 files changed, 42 insertions, 0 deletions

diff --git a/src/kernel/math/math_emulate.c b/src/kernel/math/math_emulate.c
new file mode 100644
index 0000000..825e528
--- /dev/null
+++ b/src/kernel/math/math_emulate.c
@@ -0,0 +1,42 @@
+/*
+ * linux/kernel/math/math_emulate.c
+ *
+ * (C) 1991 Linus Torvalds
+ */
+
+/*
+ * This directory should contain the math-emulation code.
+ * Currently only results in a signal.
+ */
+
+#include <signal.h>
+
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <asm/segment.h>
+
+void math_emulate(long edi, long esi, long ebp, long sys_call_ret,
+        long eax,long ebx,long ecx,long edx,
+        unsigned short fs,unsigned short es,unsigned short ds,
+        unsigned long eip,unsigned short cs,unsigned long eflags,
+        unsigned short ss, unsigned long esp)
+{
+        unsigned char first, second;
+
+/* 0x0007 means user code space */
+        if (cs != 0x000F) {
+                printk("math_emulate: %04x:%08x\n\r",cs,eip);
+                panic("Math emulation needed in kernel");
+        }
+        first = get_fs_byte((char *)((*&eip)++));
+        second = get_fs_byte((char *)((*&eip)++));
+        printk("%04x:%08x %02x %02x\n\r",cs,eip-2,first,second);
+        current->signal |= 1<<(SIGFPE-1);
+}
+
+void math_error(void)
+{
+        __asm__("fnclex");
+        if (last_task_used_math)
+                last_task_used_math->signal |= 1<<(SIGFPE-1);
+}