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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.
This commit is contained in:
Anton Kolesov 2016-10-12 14:36:44 +03:00
parent b845c31ecc
commit aaf43c4882
3 changed files with 39 additions and 1 deletions
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7
gdb/ChangeLog
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@ -1,3 +1,10 @@
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.

30
gdb/arc-tdep.c
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@ -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. */

3
gdb/arc-tdep.h
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@ -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. */