Enable DWARF unwinders for SPU
Commit Message
Hello,
this patch enables use of DWARF unwinders for the SPU target.
In addition to appending the DWARF unwinders, we also need to install
a spu_dwarf_reg_to_regnum that maps the raw stack pointer register to
the cooked version (to avoid mismatches with gdbarch_sp_regnum).
This also causes confusion with the AX collect handling, so we also
install ax_pseudo_register routines to handle the cooked SP.
Tested on spu-elf, committed to mainline.
Bye,
Ulrich
ChangeLog:
* spu-tdep.c: Include "dwarf2-frame.h" and "ax.h".
(spu_ax_pseudo_register_collect): New function.
(spu_ax_pseudo_register_push_stack): Likewise.
(spu_dwarf_reg_to_regnum): Likewise.
(spu_gdbarch_init): Install them. Append DWARF unwinders.
===================================================================
@@ -44,6 +44,8 @@
#include "observer.h"
#include "infcall.h"
#include "dwarf2.h"
+#include "dwarf2-frame.h"
+#include "ax.h"
#include "exceptions.h"
#include "spu-tdep.h"
@@ -311,6 +313,51 @@ spu_pseudo_register_write (struct gdbarc
}
}
+static int
+spu_ax_pseudo_register_collect (struct gdbarch *gdbarch,
+ struct agent_expr *ax, int regnum)
+{
+ switch (regnum)
+ {
+ case SPU_SP_REGNUM:
+ ax_reg_mask (ax, SPU_RAW_SP_REGNUM);
+ return 0;
+
+ case SPU_FPSCR_REGNUM:
+ case SPU_SRR0_REGNUM:
+ case SPU_LSLR_REGNUM:
+ case SPU_DECR_REGNUM:
+ case SPU_DECR_STATUS_REGNUM:
+ return -1;
+
+ default:
+ internal_error (__FILE__, __LINE__, _("invalid regnum"));
+ }
+}
+
+static int
+spu_ax_pseudo_register_push_stack (struct gdbarch *gdbarch,
+ struct agent_expr *ax, int regnum)
+{
+ switch (regnum)
+ {
+ case SPU_SP_REGNUM:
+ ax_reg (ax, SPU_RAW_SP_REGNUM);
+ return 0;
+
+ case SPU_FPSCR_REGNUM:
+ case SPU_SRR0_REGNUM:
+ case SPU_LSLR_REGNUM:
+ case SPU_DECR_REGNUM:
+ case SPU_DECR_STATUS_REGNUM:
+ return -1;
+
+ default:
+ internal_error (__FILE__, __LINE__, _("invalid regnum"));
+ }
+}
+
+
/* Value conversion -- access scalar values at the preferred slot. */
static struct value *
@@ -352,6 +399,15 @@ spu_register_reggroup_p (struct gdbarch
return default_register_reggroup_p (gdbarch, regnum, group);
}
+/* DWARF-2 register numbers. */
+
+static int
+spu_dwarf_reg_to_regnum (struct gdbarch *gdbarch, int reg)
+{
+ /* Use cooked instead of raw SP. */
+ return (reg == SPU_RAW_SP_REGNUM)? SPU_SP_REGNUM : reg;
+}
+
/* Address handling. */
@@ -2680,6 +2736,11 @@ spu_gdbarch_init (struct gdbarch_info in
set_gdbarch_pseudo_register_write (gdbarch, spu_pseudo_register_write);
set_gdbarch_value_from_register (gdbarch, spu_value_from_register);
set_gdbarch_register_reggroup_p (gdbarch, spu_register_reggroup_p);
+ set_gdbarch_dwarf2_reg_to_regnum (gdbarch, spu_dwarf_reg_to_regnum);
+ set_gdbarch_ax_pseudo_register_collect
+ (gdbarch, spu_ax_pseudo_register_collect);
+ set_gdbarch_ax_pseudo_register_push_stack
+ (gdbarch, spu_ax_pseudo_register_push_stack);
/* Data types. */
set_gdbarch_char_signed (gdbarch, 0);
@@ -2718,6 +2779,7 @@ spu_gdbarch_init (struct gdbarch_info in
/* Frame handling. */
set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
+ dwarf2_append_unwinders (gdbarch);
frame_unwind_append_unwinder (gdbarch, &spu_frame_unwind);
frame_base_set_default (gdbarch, &spu_frame_base);
set_gdbarch_unwind_pc (gdbarch, spu_unwind_pc);