Libc-186.tar.gz

[apple/libc.git] / sys.subproj / ppc.subproj / _setjmp.h

diff --git a/sys.subproj/ppc.subproj/_setjmp.h b/sys.subproj/ppc.subproj/_setjmp.h
index e97255c3d7172485bbef7662c0b33ddf2bd8ae9c..8a7881708541154e205f646fb18350efe69d209b 100644 (file)
--- a/sys.subproj/ppc.subproj/_setjmp.h
+++ b/sys.subproj/ppc.subproj/_setjmp.h
@@ -28,6 +28,14 @@
  *
  */
 
+/* NOTE: jmp_bufs are only 4-byte aligned.  This means we
+ * need to pad before the VR and FPR save areas, so that they
+ * can be naturally aligned in the buffer.  In case a jmp_buf
+ * is bcopy'd to a different alignment between the setjmp
+ * and longjmp, we need to save the jmp_buf address in the
+ * jmp_buf at setjmp time, so we can realign before reloading.
+ */
+ 
 #define JMP_r1 0x00
 #define JMP_r2 0x04
 #define JMP_r13        0x08
@@ -55,3 +63,13 @@
 #define JMP_xer        0x60
 #define JMP_sig        0x64
 #define JMP_SIGFLAG 0x68
+#define JMP_flags 0x6c
+#define JMP_vrsave 0x70
+#define JMP_addr_at_setjmp 0x74
+/* 12 bytes padding here */
+#define JMP_vr_base_addr 0x84
+/* save room for 12 VRs (v20-v31), or 0xC0 bytes */
+#define JMP_fp_base_addr 0x144
+/* save room for 18 FPRs (f14-f31), or 0x90 bytes */
+#define JMP_buf_end 0x1d4
+