fa5308bdcc
This patch in preparation for software single step support on ARM. It refactors
breakpoint_reinsert_addr into get_next_pcs so that multiple location can be
returned.
When software single stepping there can be multiple possible next addresses
because we're stepping over a conditional branch instruction, for example.
The operation get_next_pcs handles that by returning a vector of all the
possible next addresses.
Software breakpoints are installed at each location returned.
No regressions, tested on ubuntu 14.04 ARMv7 and x86.
With gdbserver-{native,extended} / { -marm -mthumb }
gdb/gdbserver/ChangeLog:
* linux-aarch64-low.c (the_low_targets): Rename
breakpoint_reinsert_addr to get_next_pcs.
* linux-arm-low.c (the_low_targets): Likewise.
* linux-bfin-low.c (the_low_targets): Likewise.
* linux-cris-low.c (the_low_targets): Likewise.
* linux-crisv32-low.c (the_low_targets): Likewise.
* linux-low.c (can_software_single_step): Likewise.
(install_software_single_step_breakpoints): New function.
(start_step_over): Use install_software_single_step_breakpoints.
* linux-low.h: New CORE_ADDR vector.
(struct linux_target_ops) Rename breakpoint_reinsert_addr to
get_next_pcs.
* linux-mips-low.c (the_low_targets): Likewise.
* linux-nios2-low.c (the_low_targets): Likewise.
* linux-sparc-low.c (the_low_targets): Likewise.
151 lines
3.3 KiB
C
151 lines
3.3 KiB
C
/* GNU/Linux/CRIS specific low level interface, for the remote server for GDB.
|
|
Copyright (C) 1995-2015 Free Software Foundation, Inc.
|
|
|
|
This file is part of GDB.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>. */
|
|
|
|
#include "server.h"
|
|
#include "linux-low.h"
|
|
#include "nat/gdb_ptrace.h"
|
|
|
|
/* Defined in auto-generated file reg-cris.c. */
|
|
void init_registers_cris (void);
|
|
extern const struct target_desc *tdesc_cris;
|
|
|
|
/* CRISv10 */
|
|
#define cris_num_regs 32
|
|
|
|
/* Locations need to match <include/asm/arch/ptrace.h>. */
|
|
static int cris_regmap[] = {
|
|
15*4, 14*4, 13*4, 12*4,
|
|
11*4, 10*4, 9*4, 8*4,
|
|
7*4, 6*4, 5*4, 4*4,
|
|
3*4, 2*4, 23*4, 19*4,
|
|
|
|
-1, -1, -1, -1,
|
|
-1, 17*4, -1, 16*4,
|
|
-1, -1, -1, 18*4,
|
|
-1, 17*4, -1, -1
|
|
|
|
};
|
|
|
|
static int
|
|
cris_cannot_store_register (int regno)
|
|
{
|
|
if (cris_regmap[regno] == -1)
|
|
return 1;
|
|
|
|
return (regno >= cris_num_regs);
|
|
}
|
|
|
|
static int
|
|
cris_cannot_fetch_register (int regno)
|
|
{
|
|
if (cris_regmap[regno] == -1)
|
|
return 1;
|
|
|
|
return (regno >= cris_num_regs);
|
|
}
|
|
|
|
extern int debug_threads;
|
|
|
|
static CORE_ADDR
|
|
cris_get_pc (struct regcache *regcache)
|
|
{
|
|
unsigned long pc;
|
|
collect_register_by_name (regcache, "pc", &pc);
|
|
if (debug_threads)
|
|
debug_printf ("stop pc is %08lx\n", pc);
|
|
return pc;
|
|
}
|
|
|
|
static void
|
|
cris_set_pc (struct regcache *regcache, CORE_ADDR pc)
|
|
{
|
|
unsigned long newpc = pc;
|
|
supply_register_by_name (regcache, "pc", &newpc);
|
|
}
|
|
|
|
static const unsigned short cris_breakpoint = 0xe938;
|
|
#define cris_breakpoint_len 2
|
|
|
|
/* Implementation of linux_target_ops method "sw_breakpoint_from_kind". */
|
|
|
|
static const gdb_byte *
|
|
cris_sw_breakpoint_from_kind (int kind, int *size)
|
|
{
|
|
*size = cris_breakpoint_len;
|
|
return (const gdb_byte *) &cris_breakpoint;
|
|
}
|
|
|
|
static int
|
|
cris_breakpoint_at (CORE_ADDR where)
|
|
{
|
|
unsigned short insn;
|
|
|
|
(*the_target->read_memory) (where, (unsigned char *) &insn,
|
|
cris_breakpoint_len);
|
|
if (insn == cris_breakpoint)
|
|
return 1;
|
|
|
|
/* If necessary, recognize more trap instructions here. GDB only uses the
|
|
one. */
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
cris_arch_setup (void)
|
|
{
|
|
current_process ()->tdesc = tdesc_cris;
|
|
}
|
|
|
|
static struct usrregs_info cris_usrregs_info =
|
|
{
|
|
cris_num_regs,
|
|
cris_regmap,
|
|
};
|
|
|
|
static struct regs_info regs_info =
|
|
{
|
|
NULL, /* regset_bitmap */
|
|
&cris_usrregs_info,
|
|
};
|
|
|
|
static const struct regs_info *
|
|
cris_regs_info (void)
|
|
{
|
|
return ®s_info;
|
|
}
|
|
|
|
struct linux_target_ops the_low_target = {
|
|
cris_arch_setup,
|
|
cris_regs_info,
|
|
cris_cannot_fetch_register,
|
|
cris_cannot_store_register,
|
|
NULL, /* fetch_register */
|
|
cris_get_pc,
|
|
cris_set_pc,
|
|
NULL, /* breakpoint_kind_from_pc */
|
|
cris_sw_breakpoint_from_kind,
|
|
NULL, /* get_next_pcs */
|
|
0,
|
|
cris_breakpoint_at,
|
|
};
|
|
|
|
void
|
|
initialize_low_arch (void)
|
|
{
|
|
init_registers_cris ();
|
|
}
|