[PATCH] Add longjmp support for Linux/x86.

[Mark Kettenis]

I just checked in the attached patch.  Now I can do a `next' over a
longjmp() on Linux too :-).

Mark


2000-07-07  Mark Kettenis  <kettenis@gnu.org>

	* config/i386/tm-linux.h: Add longjmp support.
	(JB_ELEMENT_SIZE, JB_PC): New defines.
	(GET_LONGJMP_TARGET): Define.
	(get_longjmp_target): Add prototype.


Index: config/i386/tm-linux.h
===================================================================
RCS file: /cvs/src/src/gdb/config/i386/tm-linux.h,v
retrieving revision 1.6
diff -u -p -r1.6 tm-linux.h
--- config/i386/tm-linux.h	2000/03/26 21:21:50	1.6
+++ config/i386/tm-linux.h	2000/07/07 00:28:53
@@ -136,5 +136,22 @@ extern CORE_ADDR i386_linux_skip_solib_r
 /* N_FUN symbols in shared libaries have 0 for their values and need
    to be relocated. */
 #define SOFUN_ADDRESS_MAYBE_MISSING
+
+
+/* Support for longjmp.  */
+
+/* Details about jmp_buf.  It's supposed to be an array of integers.  */
+
+#define JB_ELEMENT_SIZE 4	/* Size of elements in jmp_buf.  */
+#define JB_PC		5	/* Array index of saved PC.  */
+
+/* Figure out where the longjmp will land.  Slurp the args out of the
+   stack.  We expect the first arg to be a pointer to the jmp_buf
+   structure from which we extract the pc (JB_PC) that we will land
+   at.  The pc is copied into ADDR.  This routine returns true on
+   success.  */
+
+#define GET_LONGJMP_TARGET(addr) get_longjmp_target (addr)
+extern int get_longjmp_target (CORE_ADDR *addr);
 
 #endif /* #ifndef TM_LINUX_H */