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| author | Anton Kolesov <Anton.Kolesov@synopsys.com> | 2016-10-12 14:36:44 +0300 |
|---|---|---|
| committer | Anton Kolesov <Anton.Kolesov@synopsys.com> | 2016-10-12 14:47:45 +0300 |
| commit | aaf43c4882f827d9f778b40dcdb93566f765f5f9 (patch) | |
| tree | 35cf72feb379edd029febf970d92b1855b5aba60 | |
| parent | b845c31ecc4fe2677f1d938b0d8a3dc98397158e (diff) | |
| download | gdb-aaf43c4882f827d9f778b40dcdb93566f765f5f9.zip gdb-aaf43c4882f827d9f778b40dcdb93566f765f5f9.tar.gz gdb-aaf43c4882f827d9f778b40dcdb93566f765f5f9.tar.bz2 | |
arc: Add evaluation of long jump targets
Standard get_longjmp_target implementation, similar to what is in arm-tdep.c.
Actual value of jb_pc should be set in init_osabi methods of particular OS/ABI
implementations.
gdb/ChangeLog:
* arc-tdep.h (struct gdbarch_tdep) <jb_pc>: New field.
* arc-tdep.c (arc_get_longjmp_target): New function.
(arc_gdbarch_init): Set get_longjmp_target if jb_pc is non-negative.
(arc_dump_tdep): Print jb_pc.
| -rw-r--r-- | gdb/ChangeLog | 7 | ||||
| -rw-r--r-- | gdb/arc-tdep.c | 30 | ||||
| -rw-r--r-- | gdb/arc-tdep.h | 3 |
3 files changed, 39 insertions, 1 deletions
diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 29544c9..b346137 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,5 +1,12 @@ 2016-10-12 Anton Kolesov <anton.kolesov@synopsys.com> + * arc-tdep.h (struct gdbarch_tdep) <jb_pc>: New field. + * arc-tdep.c (arc_get_longjmp_target): New function. + (arc_gdbarch_init): Set get_longjmp_target if jb_pc is non-negative. + (arc_dump_tdep): Print jb_pc. + +2016-10-12 Anton Kolesov <anton.kolesov@synopsys.com> + * arc-tdep.h (struct gdbarch_tdep): New. * arc-tdep.c (arc_gdbarch_init): Allocate gdbarch_tdep. diff --git a/gdb/arc-tdep.c b/gdb/arc-tdep.c index 58de8e9..c848dc2 100644 --- a/gdb/arc-tdep.c +++ b/gdb/arc-tdep.c @@ -557,6 +557,28 @@ arc_store_return_value (struct gdbarch *gdbarch, struct type *type, error (_("arc_store_return_value: type length too large.")); } +/* Implement the "get_longjmp_target" gdbarch method. */ + +static int +arc_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc) +{ + if (arc_debug) + debug_printf ("arc: get_longjmp_target\n"); + + struct gdbarch *gdbarch = get_frame_arch (frame); + struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); + int pc_offset = tdep->jb_pc * ARC_REGISTER_SIZE; + gdb_byte buf[ARC_REGISTER_SIZE]; + CORE_ADDR jb_addr = get_frame_register_unsigned (frame, ARC_FIRST_ARG_REGNUM); + + if (target_read_memory (jb_addr + pc_offset, buf, ARC_REGISTER_SIZE)) + return 0; /* Failed to read from memory. */ + + *pc = extract_unsigned_integer (buf, ARC_REGISTER_SIZE, + gdbarch_byte_order (gdbarch)); + return 1; +} + /* Implement the "return_value" gdbarch method. */ static enum return_value_convention @@ -1162,6 +1184,7 @@ arc_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) /* Allocate the ARC-private target-dependent information structure, and the GDB target-independent information structure. */ struct gdbarch_tdep *tdep = XCNEW (struct gdbarch_tdep); + tdep->jb_pc = -1; /* No longjmp support by default. */ struct gdbarch *gdbarch = gdbarch_alloc (&info, tdep); /* Data types. */ @@ -1246,6 +1269,9 @@ arc_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) It can override functions set earlier. */ gdbarch_init_osabi (info, gdbarch); + if (tdep->jb_pc >= 0) + set_gdbarch_get_longjmp_target (gdbarch, arc_get_longjmp_target); + tdesc_use_registers (gdbarch, tdesc, tdesc_data); return gdbarch; @@ -1256,7 +1282,9 @@ arc_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) static void arc_dump_tdep (struct gdbarch *gdbarch, struct ui_file *file) { - /* Empty for now. */ + struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); + + fprintf_unfiltered (file, "arc_dump_tdep: jb_pc = %i\n", tdep->jb_pc); } /* Suppress warning from -Wmissing-prototypes. */ diff --git a/gdb/arc-tdep.h b/gdb/arc-tdep.h index ea34b9e..1e792b9 100644 --- a/gdb/arc-tdep.h +++ b/gdb/arc-tdep.h @@ -81,6 +81,9 @@ extern int arc_debug; struct gdbarch_tdep { + /* Offset to PC value in jump buffer. If this is negative, longjmp + support will be disabled. */ + int jb_pc; }; /* Utility functions used by other ARC-specific modules. */ |