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Enable DWARF unwinders for SPU

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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.

gdb/
2014-04-17  Ulrich Weigand  <uweigand@de.ibm.com>

	* 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.
This commit is contained in:
Ulrich Weigand 2014-04-17 14:09:49 +02:00
parent 2ed3c037cf
commit 7ce16bd4c4
2 changed files with 70 additions and 0 deletions
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8
gdb/ChangeLog
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@ -1,3 +1,11 @@
2014-04-17 Ulrich Weigand  <uweigand@de.ibm.com>
* 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.
2014-04-17 Ulrich Weigand  <uweigand@de.ibm.com>
* gdbarch.sh (value_from_register): Make class "m" instead of "f".

62
gdb/spu-tdep.c
View File

@ -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 gdbarch *gdbarch, struct regcache *regcache,
}
}
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 *gdbarch, int regnum,
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 info, struct gdbarch_list *arches)
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 info, struct gdbarch_list *arches)
/* 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);