mi+md jmp_buf; save i386s fs and gs for WINE (csapuntz@stanford.edu)

1 files changed, 70 insertions, 22 deletions

diff --git a/lib/libc_r/arch/i386/uthread_machdep.h b/lib/libc_r/arch/i386/uthread_machdep.h
index 652f32d4285..6e6e83b850c 100644
--- a/lib/libc_r/arch/i386/uthread_machdep.h
+++ b/lib/libc_r/arch/i386/uthread_machdep.h
@@ -1,40 +1,88 @@
 /*
  * OpenBSD/i386 machine-dependent thread macros
  *
- * $OpenBSD: uthread_machdep.h,v 1.3 1999/01/10 22:59:33 d Exp $
+ * $OpenBSD: uthread_machdep.h,v 1.4 1999/01/17 23:49:49 d Exp $
  */
 
 #include <machine/reg.h>
 
-/* save the floating point state of a thread */
-#define _thread_machdep_save_float_state(thr) 		\
-	{						\
+/* 
+ * We need to extend jmp_buf to hold extended segment registers
+ * for WINE.
+ */
+typedef struct _machdep_jmp_buf {
+	union {
+		jmp_buf		jb;
+		struct {
+			int		eip;
+			int		ebx;
+			int		esp;
+			int		ebp;
+			int		esi;
+			int		edi;
+		} jbs;
+	} u;
+#define mjb_eip	u.jbs.eip
+#define mjb_ebx	u.jbs.ebx
+#define mjb_esp	u.jbs.esp
+#define mjb_ebp	u.jbs.ebp
+#define mjb_esi	u.jbs.esi
+#define mjb_edi	u.jbs.edi
+	int		mjb_ds;	/* informational only - not restored */
+	int		mjb_es;	/* informational only - not restored */
+	int		mjb_fs;
+	int		mjb_gs;
+} _machdep_jmp_buf;
+
+/* Extra machine-dependent information */
+struct _machdep_struct {
+	struct fpreg	saved_fp;	/* only saved with on signals */
+};
+
+/* Save the floating point state of a thread: */
+#define _thread_machdep_save_float_state(thr) 			\
+	{							\
 	    char *fdata = (char*)(&(thr)->_machdep.saved_fp);	\
-	    __asm__("fsave %0"::"m" (*fdata));		\
+	    __asm__("fsave %0"::"m" (*fdata));			\
 	}
 
-/* restore the floating point state of a thread */
-#define _thread_machdep_restore_float_state(thr) 	\
-	{						\
+/* Restore the floating point state of a thread: */
+#define _thread_machdep_restore_float_state(thr) 		\
+	{							\
 	    char *fdata = (char*)(&(thr)->_machdep.saved_fp);	\
-	    __asm__("frstor %0"::"m" (*fdata));		\
+	    __asm__("frstor %0"::"m" (*fdata));			\
 	}
 
-/* initialise the jmpbuf stack frame so it continues from entry */
+/* Initialise the jmpbuf stack frame so it continues from entry: */
 #define _thread_machdep_thread_create(thr, entry, pattr)	\
-	{						\
-	    /* entry */					\
-	    (thr)->saved_jmp_buf[0] = (long) entry;	\
-	    /* stack */					\
-	    (thr)->saved_jmp_buf[2] = (long) (thr)->stack \
-				+ (pattr)->stacksize_attr \
-				- sizeof(double);	\
+	{							\
+	    /* entry */						\
+	    (thr)->saved_jmp_buf.mjb_eip = (long) entry;	\
+	    /* stack */						\
+	    (thr)->saved_jmp_buf.mjb_esp = (long) (thr)->stack	\
+				+ (pattr)->stacksize_attr 	\
+				- sizeof(double);		\
 	}
 
-#define	_thread_machdep_longjmp(a,v)	longjmp(a,v)
-#define	_thread_machdep_setjmp(a)	setjmp(a)
+static __inline int
+_thread_machdep_setjmp_helper(a)
+	_machdep_jmp_buf *a;
+{
+	int v;
 
-struct _machdep_struct {
-	struct fpreg	saved_fp;
-};
+	__asm__("mov %%ds, %0\n" : "=m" (a->mjb_ds) );
+	__asm__("mov %%es, %0\n" : "=m" (a->mjb_es) );
+	__asm__("mov %%fs, %0\n" : "=m" (a->mjb_fs) );
+	__asm__("mov %%gs, %0\n" : "=m" (a->mjb_gs) );
+	v = setjmp(a->u.jb);
+	if (v) {
+		__asm__("mov %0, %%gs\n" :: "m" (a->mjb_gs) );
+		__asm__("mov %0, %%fs\n" :: "m" (a->mjb_fs) );
+		/* __asm__("mov %0, %%es\n" :: "m" (a->mjb_es) ); */
+		/* __asm__("mov %0, %%ds\n" :: "m" (a->mjb_ds) ); */
+	}
+	return (v);
+}
 
+#define _thread_machdep_longjmp(a,v)	longjmp((a).u.jb,v)
+#define _thread_machdep_setjmp(a)	_thread_machdep_setjmp_helper(&(a))