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/tmp/gdb-7.10/gdb/tic6x-linux-tdep.c
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1 /* GNU/Linux on TI C6x target support.
2  Copyright (C) 2011-2015 Free Software Foundation, Inc.
3  Contributed by Yao Qi <yao@codesourcery.com>
4 
5  This file is part of GDB.
6 
7  This program is free software; you can redistribute it and/or modify
8  it under the terms of the GNU General Public License as published by
9  the Free Software Foundation; either version 3 of the License, or
10  (at your option) any later version.
11 
12  This program is distributed in the hope that it will be useful,
13  but WITHOUT ANY WARRANTY; without even the implied warranty of
14  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  GNU General Public License for more details.
16 
17  You should have received a copy of the GNU General Public License
18  along with this program. If not, see <http://www.gnu.org/licenses/>. */
19 
20 #include "defs.h"
21 #include "solib.h"
22 #include "osabi.h"
23 #include "linux-tdep.h"
24 #include "tic6x-tdep.h"
25 #include "trad-frame.h"
26 #include "tramp-frame.h"
27 #include "elf-bfd.h"
28 #include "elf/tic6x.h"
29 
33 
34 /* The offset from rt_sigframe pointer to SP register. */
35 #define TIC6X_SP_RT_SIGFRAME 8
36 /* Size of struct siginfo info. */
37 #define TIC6X_SIGINFO_SIZE 128
38 /* Size of type stack_t, which contains three fields of type void*, int, and
39  size_t respectively. */
40 #define TIC6X_STACK_T_SIZE (3 * 4)
41 
42 static const gdb_byte tic6x_bkpt_bnop_be[] = { 0x00, 0x00, 0xa1, 0x22 };
43 static const gdb_byte tic6x_bkpt_bnop_le[] = { 0x22, 0xa1, 0x00, 0x00 };
44 
45 /* Return the offset of register REGNUM in struct sigcontext. Return 0 if no
46  such register in sigcontext. */
47 
48 static unsigned int
50 {
51  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
52 
53  if (regnum == TIC6X_A4_REGNUM || regnum == TIC6X_A4_REGNUM + 2
54  || regnum == TIC6X_A4_REGNUM + 4)
55  return 4 * (regnum - TIC6X_A4_REGNUM + 2); /* A4, A6, A8 */
56  else if (regnum == TIC6X_A5_REGNUM || regnum == TIC6X_A5_REGNUM + 2
57  || regnum == TIC6X_A5_REGNUM + 4)
58  return 4 * (regnum - TIC6X_A5_REGNUM + 12); /* A5, A7, A9 */
59  else if (regnum == TIC6X_B4_REGNUM || regnum == TIC6X_B4_REGNUM + 2
60  || regnum == TIC6X_B4_REGNUM + 4)
61  return 4 * (regnum - TIC6X_B4_REGNUM + 3); /* B4, B6, B8 */
62  else if (regnum == TIC6X_B5_REGNUM || regnum == TIC6X_B5_REGNUM + 2
63  || regnum == TIC6X_B5_REGNUM + 4)
64  return 4 * (regnum - TIC6X_B5_REGNUM + 19); /* B5, B7, B9 */
65  else if (regnum < TIC6X_A4_REGNUM)
66  return 4 * (regnum - 0 + 8); /* A0 - A3 */
67  else if (regnum >= TIC6X_B0_REGNUM && regnum < TIC6X_B4_REGNUM)
68  return 4 * (regnum - TIC6X_B0_REGNUM + 15); /* B0 - B3 */
69  else if (regnum >= 34 && regnum < 34 + 32)
70  return 4 * (regnum - 34 + 23); /* A16 - A31, B16 - B31 */
71  else if (regnum == TIC6X_PC_REGNUM)
72  return 4 * (tdep->has_gp ? 55 : 23);
73  else if (regnum == TIC6X_SP_REGNUM)
74  return 4;
75 
76  return 0;
77 }
78 
79 /* Support unwinding frame in signal trampoline. We don't check sigreturn,
80  since it is not used in kernel. */
81 
82 static void
84  struct frame_info *this_frame,
85  struct trad_frame_cache *this_cache,
87 {
88  struct gdbarch *gdbarch = get_frame_arch (this_frame);
90  /* The base of struct sigcontext is computed by examining the definition of
91  struct rt_sigframe in linux kernel source arch/c6x/kernel/signal.c. */
92  CORE_ADDR base = (sp + TIC6X_SP_RT_SIGFRAME
93  /* Pointer type *pinfo and *puc in struct rt_sigframe. */
94  + 4 + 4
96  + 4 + 4 /* uc_flags and *uc_link in struct ucontext. */
98  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
99  unsigned int reg_offset;
100  unsigned int i;
101 
102  for (i = 0; i < 10; i++) /* A0 - A9 */
103  {
104  reg_offset = tic6x_register_sigcontext_offset (i, gdbarch);
105  gdb_assert (reg_offset != 0);
106 
107  trad_frame_set_reg_addr (this_cache, i, base + reg_offset);
108  }
109 
110  for (i = TIC6X_B0_REGNUM; i < TIC6X_B0_REGNUM + 10; i++) /* B0 - B9 */
111  {
112  reg_offset = tic6x_register_sigcontext_offset (i, gdbarch);
113  gdb_assert (reg_offset != 0);
114 
115  trad_frame_set_reg_addr (this_cache, i, base + reg_offset);
116  }
117 
118  if (tdep->has_gp)
119  for (i = 34; i < 34 + 32; i++) /* A16 - A31, B16 - B31 */
120  {
121  reg_offset = tic6x_register_sigcontext_offset (i, gdbarch);
122  gdb_assert (reg_offset != 0);
123 
124  trad_frame_set_reg_addr (this_cache, i, base + reg_offset);
125  }
126 
129  gdbarch));
132  gdbarch));
133 
134  /* Save a frame ID. */
135  trad_frame_set_id (this_cache, frame_id_build (sp, func));
136 }
137 
138 static struct tramp_frame tic6x_linux_rt_sigreturn_tramp_frame =
139 {
141  4,
142  {
143  {0x000045aa, 0x0fffffff}, /* mvk .S2 139,b0 */
144  {0x10000000, -1}, /* swe */
146  },
148 };
149 
150 /* When FRAME is at a syscall instruction, return the PC of the next
151  instruction to be executed. */
152 
153 static CORE_ADDR
155 {
156  ULONGEST syscall_number = get_frame_register_unsigned (frame,
158  CORE_ADDR pc = get_frame_pc (frame);
159 
160  if (syscall_number == 139 /* rt_sigreturn */)
161  return frame_unwind_caller_pc (frame);
162 
163  return pc + 4;
164 }
165 
166 
167 extern struct target_so_ops dsbt_so_ops;
168 static void
170 {
171  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
172 
173  linux_init_abi (info, gdbarch);
174 
175  /* Shared library handling. */
176  set_solib_ops (gdbarch, &dsbt_so_ops);
177 
179 
180 #ifdef HAVE_ELF
181  /* In tic6x Linux kernel, breakpoint instructions varies on different archs.
182  On C64x+ and C67x+, breakpoint instruction is 0x56454314, which is an
183  illegal opcode. On other arch, breakpoint instruction is 0x0000a122
184  (BNOP .S2 0,5). */
185  if (info.abfd)
186  switch (bfd_elf_get_obj_attr_int (info.abfd, OBJ_ATTR_PROC, Tag_ISA))
187  {
188  case C6XABI_Tag_ISA_C64XP:
189  case C6XABI_Tag_ISA_C67XP:
190  if (info.byte_order == BFD_ENDIAN_BIG)
192  else
194  break;
195  default:
196  {
197  if (info.byte_order == BFD_ENDIAN_BIG)
199  else
201  }
202  }
203 #endif
204 
205  /* Signal trampoline support. */
207  &tic6x_linux_rt_sigreturn_tramp_frame);
208 }
209 
210 /* Provide a prototype to silence -Wmissing-prototypes. */
212 
213 void
215 {
216  gdbarch_register_osabi (bfd_arch_tic6x, 0, GDB_OSABI_LINUX,
218 
222 }
const gdb_byte tic6x_bkpt_illegal_opcode_be[]
Definition: tic6x-tdep.c:62
static void initialize_tdesc_tic6x_c64x_linux(void)
CORE_ADDR(* syscall_next_pc)(struct frame_info *frame)
Definition: arm-tdep.h:206
void trad_frame_set_reg_addr(struct trad_frame_cache *this_trad_cache, int regnum, CORE_ADDR addr)
Definition: trad-frame.c:119
struct frame_id frame_id_build(CORE_ADDR stack_addr, CORE_ADDR code_addr)
Definition: frame.c:554
static void tic6x_uclinux_init_abi(struct gdbarch_info info, struct gdbarch *gdbarch)
CORE_ADDR get_frame_pc(struct frame_info *frame)
Definition: frame.c:2217
bfd_vma CORE_ADDR
Definition: common-types.h:41
#define TRAMP_SENTINEL_INSN
Definition: tramp-frame.h:44
#define TIC6X_SP_RT_SIGFRAME
CORE_ADDR frame_unwind_caller_pc(struct frame_info *this_frame)
Definition: frame.c:870
void(* func)(char *)
void set_solib_ops(struct gdbarch *gdbarch, const struct target_so_ops *new_ops)
Definition: solib.c:76
void trad_frame_set_id(struct trad_frame_cache *this_trad_cache, struct frame_id this_id)
Definition: trad-frame.c:164
initialize_file_ftype _initialize_tic6x_linux_tdep
static int reg_offset[]
Definition: i386gnu-nat.c:42
const gdb_byte * breakpoint
Definition: tic6x-tdep.h:50
void linux_init_abi(struct gdbarch_info info, struct gdbarch *gdbarch)
Definition: linux-tdep.c:2427
struct gdbarch_tdep * gdbarch_tdep(struct gdbarch *gdbarch)
Definition: gdbarch.c:1402
static CORE_ADDR tic6x_linux_syscall_next_pc(struct frame_info *frame)
struct target_so_ops dsbt_so_ops
Definition: solib-dsbt.c:1063
static unsigned int tic6x_register_sigcontext_offset(unsigned int regnum, struct gdbarch *gdbarch)
void initialize_file_ftype(void)
Definition: defs.h:281
bfd * abfd
Definition: gdbarch.h:1557
static void initialize_tdesc_tic6x_c64xp_linux(void)
#define gdb_assert(expr)
Definition: gdb_assert.h:33
static void initialize_tdesc_tic6x_c62x_linux(void)
int regnum
Definition: aarch64-tdep.c:69
#define TIC6X_STACK_T_SIZE
ULONGEST get_frame_register_unsigned(struct frame_info *frame, int regnum)
Definition: frame.c:1194
bfd_byte gdb_byte
Definition: common-types.h:38
static void tic6x_linux_rt_sigreturn_init(const struct tramp_frame *self, struct frame_info *this_frame, struct trad_frame_cache *this_cache, CORE_ADDR func)
void tramp_frame_prepend_unwinder(struct gdbarch *gdbarch, const struct tramp_frame *tramp_frame)
Definition: tramp-frame.c:145
unsigned long long ULONGEST
Definition: common-types.h:53
static const gdb_byte tic6x_bkpt_bnop_le[]
enum bfd_endian byte_order
Definition: gdbarch.h:1552
static const gdb_byte tic6x_bkpt_bnop_be[]
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:148
struct gdbarch * get_frame_arch(struct frame_info *this_frame)
Definition: frame.c:2535
const gdb_byte tic6x_bkpt_illegal_opcode_le[]
Definition: tic6x-tdep.c:63
#define TIC6X_SIGINFO_SIZE