20110225-1058

1 files changed, 35 insertions, 0 deletions

diff --git a/Linux/spim/include/emu.h b/Linux/spim/include/emu.h
new file mode 100644
index 00000000..9ca46903
--- /dev/null
+++ b/Linux/spim/include/emu.h
@@ -0,0 +1,35 @@
+/*
+ * system- and machine-specific declarations for emu:
+ * floating-point save and restore, signal handling primitive, and
+ * implementation of the current-process variable `up'.
+ */
+
+/*
+ * This structure must agree with FPsave and FPrestore asm routines
+ */
+typedef struct FPU FPU;
+struct FPU
+{
+	uchar	env[28];
+};
+
+/*
+ * Later versions of Linux seemed to need large stack for gethostbyname()
+ * so we had this at 128k, which is excessive.  More recently, we've
+ * reduced it again after testing stack usage by gethostbyname.
+ */
+#define KSTACK (16 * 1024)
+
+static __inline Proc *getup(void) {
+	Proc *p;
+	__asm__(	"move	%0, $29\n\t"
+			: "=r" (p)
+	);
+	return *(Proc **)((unsigned long)p & ~(KSTACK - 1));
+};
+
+#define	up	(getup())
+
+typedef sigjmp_buf osjmpbuf;
+#define	ossetjmp(buf)	sigsetjmp(buf, 1)
+