1 files changed, 50 insertions, 0 deletions
diff --git a/libc/syscall/setjmp.c b/libc/syscall/setjmp.c
new file mode 100644
index 0000000..52c3ff1
--- /dev/null
+++ b/libc/syscall/setjmp.c
@@ -0,0 +1,50 @@
+
+#include <setjmp.h>
+
+#if __AS386_16__
+
+int
+setjmp(env)
+jmp_buf env;
+{
+#asm
+  pop	cx		! PC
+#if __FIRST_ARG_IN_AX__
+  mov	bx,ax
+#else
+  mov	bx,sp
+  mov	bx,[bx]		! TOS is prt -> env
+#endif
+  mov	[bx+0],cx	! PC
+  mov	[bx+2],sp	! This registers are all that may be constant.
+  mov	[bx+4],bp
+  mov	[bx+6],si	! Is saving these the "right thing" ?
+  mov	[bx+8],di
+  xor	ax,ax
+  jmp	cx
+#endasm
+}
+
+void
+longjmp(env, rv)
+jmp_buf env;
+int rv;
+{
+#asm
+  pop	cx	! pc
+#if __FIRST_ARG_IN_AX__
+  mov	bx,ax	! env->
+#else
+  pop	bx	! env->
+#endif
+  pop	ax	! rv
+  mov	cx,[bx+0]	! PC
+  mov	sp,[bx+2]
+  mov	bp,[bx+4]
+  mov	si,[bx+6]
+  mov	di,[bx+8]
+  jmp	cx
+#endasm
+}
+
+#endif