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[PATCH] Add support for stepping through longjmp to DJGPP
- To: gdb-patches at sourceware dot cygnus dot com
- Subject: [PATCH] Add support for stepping through longjmp to DJGPP
- From: Eli Zaretskii <eliz at is dot elta dot co dot il>
- Date: Sun, 29 Jul 2001 13:11:24 +0300 (IDT)
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 */