[PATCH] Add support for stepping through longjmp to DJGPP

[PATCH] Add support for stepping through longjmp to DJGPP

[Eli Zaretskii]

FYI, I've commited the attached (trunk and branch), which makes the DJGPP 
port support step and next through longjmp.

2001-07-27  Eli Zaretskii  <eliz@is.elta.co.il>

	Support for stepping through longjmp in DJGPP programs:

	* config/i386/tm-go32.h (JB_ELEMENT_SIZE, JB_PC): New macros.
	(GET_LONGJMP_TARGET): Define to call get_longjmp_target.
	(get_longjmp_target): Add prototype.

--- gdb/config/i386/tm-go32.h~0	Mon Apr  3 17:24:16 2000
+++ gdb/config/i386/tm-go32.h	Fri Jul 27 21:41:26 2001
@@ -48,4 +48,20 @@
 #undef  FRAME_SAVED_PC
 #define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4))
 
+/* 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		8	/* Array index of saved PC inside jmp_buf.  */
+
+/* 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 /* TM_GO32_H */