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bfin-linux-tdep.c
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1/* Target-dependent code for Analog Devices Blackfin processor, for GDB.
2
3 Copyright (C) 2005-2023 Free Software Foundation, Inc.
4
5 Contributed by Analog Devices, Inc.
6
7 This file is part of GDB.
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>. */
21
22#include "defs.h"
23#include "arch-utils.h"
24#include "regcache.h"
25#include "tramp-frame.h"
26#include "trad-frame.h"
27#include "osabi.h"
28#include "xml-syscall.h"
29#include "linux-tdep.h"
30#include "bfin-tdep.h"
31
32/* From <asm/sigcontext.h>. */
33
34#define SIGCONTEXT_OFFSET 168
35
37{
38 0 * 4, /* %r0 */
39 1 * 4, /* %r1 */
40 2 * 4, /* %r2 */
41 3 * 4, /* %r3 */
42 4 * 4, /* %r4 */
43 5 * 4, /* %r5 */
44 6 * 4, /* %r6 */
45 7 * 4, /* %r7 */
46 8 * 4, /* %p0 */
47 9 * 4, /* %p1 */
48 10 * 4, /* %p2 */
49 11 * 4, /* %p3 */
50 12 * 4, /* %p4 */
51 13 * 4, /* %p5 */
52 14 * 4, /* %sp */
53 23 * 4, /* %fp */
54 24 * 4, /* %i0 */
55 25 * 4, /* %i1 */
56 26 * 4, /* %i2 */
57 27 * 4, /* %i3 */
58 28 * 4, /* %m0 */
59 29 * 4, /* %m1 */
60 30 * 4, /* %m2 */
61 31 * 4, /* %m3 */
62 36 * 4, /* %b0 */
63 37 * 4, /* %b1 */
64 38 * 4, /* %b2 */
65 39 * 4, /* %b3 */
66 32 * 4, /* %l0 */
67 33 * 4, /* %l1 */
68 34 * 4, /* %l2 */
69 35 * 4, /* %l3 */
70 17 * 4, /* %a0x */
71 15 * 4, /* %a0w */
72 18 * 4, /* %a1x */
73 16 * 4, /* %a1w */
74 19 * 4, /* %astat */
75 20 * 4, /* %rets */
76 40 * 4, /* %lc0 */
77 42 * 4, /* %lt0 */
78 44 * 4, /* %lb0 */
79 41 * 4, /* %lc1 */
80 43 * 4, /* %lt1 */
81 45 * 4, /* %lb1 */
82 -1, /* %cycles */
83 -1, /* %cycles2 */
84 -1, /* %usp */
85 46 * 4, /* %seqstat */
86 -1, /* syscfg */
87 21 * 4, /* %reti */
88 22 * 4, /* %retx */
89 -1, /* %retn */
90 -1, /* %rete */
91 21 * 4, /* %pc */
92};
93
94/* Signal trampolines. */
95
96static void
98 frame_info_ptr this_frame,
99 struct trad_frame_cache *this_cache,
100 CORE_ADDR func)
101{
102 CORE_ADDR sp = get_frame_sp (this_frame);
103 CORE_ADDR pc = get_frame_pc (this_frame);
104 CORE_ADDR sigcontext = sp + SIGCONTEXT_OFFSET;
106 int i;
107
108 for (i = 0; i < BFIN_NUM_REGS; i++)
109 if (reg_offset[i] != -1)
110 trad_frame_set_reg_addr (this_cache, i, sigcontext + reg_offset[i]);
111
112 /* This would come after the LINK instruction in the ret_from_signal
113 function, hence the frame id would be SP + 8. */
114 trad_frame_set_id (this_cache, frame_id_build (sp + 8, pc));
115}
116
117static const struct tramp_frame bfin_linux_sigframe =
118{
120 4,
121 {
122 { 0x00ADE128, 0xffffffff }, /* P0 = __NR_rt_sigreturn; */
123 { 0x00A0, 0xffff }, /* EXCPT 0; */
124 { TRAMP_SENTINEL_INSN, ULONGEST_MAX },
125 },
127};
128
129static LONGEST
131 thread_info *thread)
132{
133 struct regcache *regcache = get_thread_regcache (thread);
134 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
135 /* The content of a register. */
136 gdb_byte buf[4];
137 /* The result. */
138 LONGEST ret;
139
140 /* Getting the system call number from the register.
141 When dealing with Blackfin architecture, this information
142 is stored at %p0 register. */
144
145 ret = extract_signed_integer (buf, 4, byte_order);
146
147 return ret;
148}
149
150static void
152{
153 linux_init_abi (info, gdbarch, 0);
154
155 /* Set the sigtramp frame sniffer. */
157
158 /* Functions for 'catch syscall'. */
159 set_xml_syscall_file_name (gdbarch, "syscalls/bfin-linux.xml");
162}
163
165void
void _initialize_bfin_linux_tdep()
static LONGEST bfin_linux_get_syscall_number(struct gdbarch *gdbarch, thread_info *thread)
static void bfin_linux_sigframe_init(const struct tramp_frame *self, frame_info_ptr this_frame, struct trad_frame_cache *this_cache, CORE_ADDR func)
static void bfin_linux_init_abi(struct gdbarch_info info, struct gdbarch *gdbarch)
static const int bfin_linux_sigcontext_reg_offset[BFIN_NUM_REGS]
#define SIGCONTEXT_OFFSET
static const struct tramp_frame bfin_linux_sigframe
#define BFIN_NUM_REGS
Definition bfin-tdep.h:89
@ BFIN_P0_REGNUM
Definition bfin-tdep.h:37
enum register_status cooked_read(int regnum, gdb_byte *buf)
Definition regcache.c:698
static LONGEST extract_signed_integer(gdb::array_view< const gdb_byte > buf, enum bfd_endian byte_order)
Definition defs.h:465
CORE_ADDR get_frame_pc(frame_info_ptr frame)
Definition frame.c:2712
CORE_ADDR get_frame_sp(frame_info_ptr this_frame)
Definition frame.c:3115
struct frame_id frame_id_build(CORE_ADDR stack_addr, CORE_ADDR code_addr)
Definition frame.c:736
@ SIGTRAMP_FRAME
Definition frame.h:198
enum bfd_endian gdbarch_byte_order(struct gdbarch *gdbarch)
Definition gdbarch.c:1396
void set_gdbarch_get_syscall_number(struct gdbarch *gdbarch, gdbarch_get_syscall_number_ftype *get_syscall_number)
static int reg_offset[]
void linux_init_abi(struct gdbarch_info info, struct gdbarch *gdbarch, int num_disp_step_buffers)
void gdbarch_register_osabi(enum bfd_architecture arch, unsigned long machine, enum gdb_osabi osabi, void(*init_osabi)(struct gdbarch_info, struct gdbarch *))
Definition osabi.c:146
@ GDB_OSABI_LINUX
Definition osabi.h:32
struct regcache * get_thread_regcache(process_stratum_target *target, ptid_t ptid)
Definition regcache.c:400
void(* func)(remote_target *remote, char *)
void trad_frame_set_reg_addr(struct trad_frame_cache *this_trad_cache, int regnum, CORE_ADDR addr)
Definition trad-frame.c:110
void trad_frame_set_id(struct trad_frame_cache *this_trad_cache, struct frame_id this_id)
Definition trad-frame.c:220
void tramp_frame_prepend_unwinder(struct gdbarch *gdbarch, const struct tramp_frame *tramp_frame)
#define TRAMP_SENTINEL_INSN
Definition tramp-frame.h:44
void set_xml_syscall_file_name(struct gdbarch *gdbarch, const char *name)
Definition xml-syscall.c:50