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/* Target-dependent code for Analog Devices Blackfin processor, for GDB.
Copyright (C) 2005-2018 Free Software Foundation, Inc.
Contributed by Analog Devices, 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 "defs.h"
#include "arch-utils.h"
#include "regcache.h"
#include "tramp-frame.h"
#include "trad-frame.h"
#include "osabi.h"
#include "xml-syscall.h"
#include "linux-tdep.h"
#include "bfin-tdep.h"
/* From <asm/sigcontext.h>. */
#define SIGCONTEXT_OFFSET 168
static const int bfin_linux_sigcontext_reg_offset[BFIN_NUM_REGS] =
{
0 * 4, /* %r0 */
1 * 4, /* %r1 */
2 * 4, /* %r2 */
3 * 4, /* %r3 */
4 * 4, /* %r4 */
5 * 4, /* %r5 */
6 * 4, /* %r6 */
7 * 4, /* %r7 */
8 * 4, /* %p0 */
9 * 4, /* %p1 */
10 * 4, /* %p2 */
11 * 4, /* %p3 */
12 * 4, /* %p4 */
13 * 4, /* %p5 */
14 * 4, /* %sp */
23 * 4, /* %fp */
24 * 4, /* %i0 */
25 * 4, /* %i1 */
26 * 4, /* %i2 */
27 * 4, /* %i3 */
28 * 4, /* %m0 */
29 * 4, /* %m1 */
30 * 4, /* %m2 */
31 * 4, /* %m3 */
36 * 4, /* %b0 */
37 * 4, /* %b1 */
38 * 4, /* %b2 */
39 * 4, /* %b3 */
32 * 4, /* %l0 */
33 * 4, /* %l1 */
34 * 4, /* %l2 */
35 * 4, /* %l3 */
17 * 4, /* %a0x */
15 * 4, /* %a0w */
18 * 4, /* %a1x */
16 * 4, /* %a1w */
19 * 4, /* %astat */
20 * 4, /* %rets */
40 * 4, /* %lc0 */
42 * 4, /* %lt0 */
44 * 4, /* %lb0 */
41 * 4, /* %lc1 */
43 * 4, /* %lt1 */
45 * 4, /* %lb1 */
-1, /* %cycles */
-1, /* %cycles2 */
-1, /* %usp */
46 * 4, /* %seqstat */
-1, /* syscfg */
21 * 4, /* %reti */
22 * 4, /* %retx */
-1, /* %retn */
-1, /* %rete */
21 * 4, /* %pc */
};
/* Signal trampolines. */
static void
bfin_linux_sigframe_init (const struct tramp_frame *self,
struct frame_info *this_frame,
struct trad_frame_cache *this_cache,
CORE_ADDR func)
{
CORE_ADDR sp = get_frame_sp (this_frame);
CORE_ADDR pc = get_frame_pc (this_frame);
CORE_ADDR sigcontext = sp + SIGCONTEXT_OFFSET;
const int *reg_offset = bfin_linux_sigcontext_reg_offset;
int i;
for (i = 0; i < BFIN_NUM_REGS; i++)
if (reg_offset[i] != -1)
trad_frame_set_reg_addr (this_cache, i, sigcontext + reg_offset[i]);
/* This would come after the LINK instruction in the ret_from_signal
function, hence the frame id would be SP + 8. */
trad_frame_set_id (this_cache, frame_id_build (sp + 8, pc));
}
static const struct tramp_frame bfin_linux_sigframe =
{
SIGTRAMP_FRAME,
4,
{
{ 0x00ADE128, 0xffffffff }, /* P0 = __NR_rt_sigreturn; */
{ 0x00A0, 0xffff }, /* EXCPT 0; */
{ TRAMP_SENTINEL_INSN, -1 },
},
bfin_linux_sigframe_init,
};
static LONGEST
bfin_linux_get_syscall_number (struct gdbarch *gdbarch,
ptid_t ptid)
{
struct regcache *regcache = get_thread_regcache (ptid);
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
/* The content of a register. */
gdb_byte buf[4];
/* The result. */
LONGEST ret;
/* Getting the system call number from the register.
When dealing with Blackfin architecture, this information
is stored at %p0 register. */
regcache_cooked_read (regcache, BFIN_P0_REGNUM, buf);
ret = extract_signed_integer (buf, 4, byte_order);
return ret;
}
static void
bfin_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
linux_init_abi (info, gdbarch);
/* Set the sigtramp frame sniffer. */
tramp_frame_prepend_unwinder (gdbarch, &bfin_linux_sigframe);
/* Functions for 'catch syscall'. */
set_xml_syscall_file_name (gdbarch, "syscalls/bfin-linux.xml");
set_gdbarch_get_syscall_number (gdbarch,
bfin_linux_get_syscall_number);
}
void
_initialize_bfin_linux_tdep (void)
{
gdbarch_register_osabi (bfd_arch_bfin, 0, GDB_OSABI_LINUX,
bfin_linux_init_abi);
}
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