1 /* GNU/Linux on TI C6x target support.
3 Free Software Foundation, Inc.
4 Contributed by Yao Qi <yao@codesourcery.com>
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
24 #include "linux-tdep.h"
25 #include "tic6x-tdep.h"
26 #include "trad-frame.h"
27 #include "tramp-frame.h"
28 #include "gdb_assert.h"
30 #include "elf/tic6x.h"
32 #include "features/tic6x-c64xp-linux.c"
33 #include "features/tic6x-c64x-linux.c"
34 #include "features/tic6x-c62x-linux.c"
36 /* The offset from rt_sigframe pointer to SP register. */
37 #define TIC6X_SP_RT_SIGFRAME 8
38 /* Size of struct siginfo info. */
39 #define TIC6X_SIGINFO_SIZE 128
40 /* Size of type stack_t, which contains three fields of type void*, int, and
41 size_t respectively. */
42 #define TIC6X_STACK_T_SIZE (3 * 4)
44 static const gdb_byte tic6x_bkpt_bnop_be
[] = { 0x00, 0x00, 0xa1, 0x22 };
45 static const gdb_byte tic6x_bkpt_bnop_le
[] = { 0x22, 0xa1, 0x00, 0x00 };
47 /* Return the offset of register REGNUM in struct sigcontext. Return 0 if no
48 such register in sigcontext. */
51 tic6x_register_sigcontext_offset (unsigned int regnum
, struct gdbarch
*gdbarch
)
53 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
55 if (regnum
== TIC6X_A4_REGNUM
|| regnum
== TIC6X_A4_REGNUM
+ 2
56 || regnum
== TIC6X_A4_REGNUM
+ 4)
57 return 4 * (regnum
- TIC6X_A4_REGNUM
+ 2); /* A4, A6, A8 */
58 else if (regnum
== TIC6X_A5_REGNUM
|| regnum
== TIC6X_A5_REGNUM
+ 2
59 || regnum
== TIC6X_A5_REGNUM
+ 4)
60 return 4 * (regnum
- TIC6X_A5_REGNUM
+ 12); /* A5, A7, A9 */
61 else if (regnum
== TIC6X_B4_REGNUM
|| regnum
== TIC6X_B4_REGNUM
+ 2
62 || regnum
== TIC6X_B4_REGNUM
+ 4)
63 return 4 * (regnum
- TIC6X_B4_REGNUM
+ 3); /* B4, B6, B8 */
64 else if (regnum
== TIC6X_B5_REGNUM
|| regnum
== TIC6X_B5_REGNUM
+ 2
65 || regnum
== TIC6X_B5_REGNUM
+ 4)
66 return 4 * (regnum
- TIC6X_B5_REGNUM
+ 19); /* B5, B7, B9 */
67 else if (regnum
>= 0 && regnum
< TIC6X_A4_REGNUM
)
68 return 4 * (regnum
- 0 + 8); /* A0 - A3 */
69 else if (regnum
>= TIC6X_B0_REGNUM
&& regnum
< TIC6X_B4_REGNUM
)
70 return 4 * (regnum
- TIC6X_B0_REGNUM
+ 15); /* B0 - B3 */
71 else if (regnum
>= 34 && regnum
< 34 + 32)
72 return 4 * (regnum
- 34 + 23); /* A16 - A31, B16 - B31 */
73 else if (regnum
== TIC6X_PC_REGNUM
)
74 return 4 * (tdep
->has_gp
? 55 : 23);
75 else if (regnum
== TIC6X_SP_REGNUM
)
81 /* Support unwinding frame in signal trampoline. We don't check sigreturn,
82 since it is not used in kernel. */
85 tic6x_linux_rt_sigreturn_init (const struct tramp_frame
*self
,
86 struct frame_info
*this_frame
,
87 struct trad_frame_cache
*this_cache
,
90 struct gdbarch
*gdbarch
= get_frame_arch (this_frame
);
91 CORE_ADDR sp
= get_frame_register_unsigned (this_frame
, TIC6X_SP_REGNUM
);
92 /* The base of struct sigcontext is computed by examining the definition of
93 struct rt_sigframe in linux kernel source arch/c6x/kernel/signal.c. */
94 CORE_ADDR base
= (sp
+ TIC6X_SP_RT_SIGFRAME
95 /* Pointer type *pinfo and *puc in struct rt_sigframe. */
98 + 4 + 4 /* uc_flags and *uc_link in struct ucontext. */
99 + TIC6X_STACK_T_SIZE
);
100 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
101 unsigned int reg_offset
;
104 for (i
= 0; i
< 10; i
++) /* A0 - A9 */
106 reg_offset
= tic6x_register_sigcontext_offset (i
, gdbarch
);
107 gdb_assert (reg_offset
!= 0);
109 trad_frame_set_reg_addr (this_cache
, i
, base
+ reg_offset
);
112 for (i
= TIC6X_B0_REGNUM
; i
< TIC6X_B0_REGNUM
+ 10; i
++) /* B0 - B9 */
114 reg_offset
= tic6x_register_sigcontext_offset (i
, gdbarch
);
115 gdb_assert (reg_offset
!= 0);
117 trad_frame_set_reg_addr (this_cache
, i
, base
+ reg_offset
);
121 for (i
= 34; i
< 34 + 32; i
++) /* A16 - A31, B16 - B31 */
123 reg_offset
= tic6x_register_sigcontext_offset (i
, gdbarch
);
124 gdb_assert (reg_offset
!= 0);
126 trad_frame_set_reg_addr (this_cache
, i
, base
+ reg_offset
);
129 trad_frame_set_reg_addr (this_cache
, TIC6X_PC_REGNUM
,
130 base
+ tic6x_register_sigcontext_offset (TIC6X_PC_REGNUM
,
132 trad_frame_set_reg_addr (this_cache
, TIC6X_SP_REGNUM
,
133 base
+ tic6x_register_sigcontext_offset (TIC6X_SP_REGNUM
,
136 /* Save a frame ID. */
137 trad_frame_set_id (this_cache
, frame_id_build (sp
, func
));
140 static struct tramp_frame tic6x_linux_rt_sigreturn_tramp_frame
=
145 {0x000045aa, 0x0fffffff}, /* mvk .S2 139,b0 */
146 {0x10000000, -1}, /* swe */
147 {TRAMP_SENTINEL_INSN
}
149 tic6x_linux_rt_sigreturn_init
152 /* When FRAME is at a syscall instruction, return the PC of the next
153 instruction to be executed. */
156 tic6x_linux_syscall_next_pc (struct frame_info
*frame
)
158 ULONGEST syscall_number
= get_frame_register_unsigned (frame
,
160 CORE_ADDR pc
= get_frame_pc (frame
);
162 if (syscall_number
== 139 /* rt_sigreturn */)
163 return frame_unwind_caller_pc (frame
);
169 extern struct target_so_ops dsbt_so_ops
;
171 tic6x_uclinux_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
173 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
175 linux_init_abi (info
, gdbarch
);
177 /* Shared library handling. */
178 set_solib_ops (gdbarch
, &dsbt_so_ops
);
180 tdep
->syscall_next_pc
= tic6x_linux_syscall_next_pc
;
183 /* In tic6x Linux kernel, breakpoint instructions varies on different archs.
184 On C64x+ and C67x+, breakpoint instruction is 0x56454314, which is an
185 illegal opcode. On other arch, breakpoint instruction is 0x0000a122
188 switch (bfd_elf_get_obj_attr_int (info
.abfd
, OBJ_ATTR_PROC
, Tag_ISA
))
190 case C6XABI_Tag_ISA_C64XP
:
191 case C6XABI_Tag_ISA_C67XP
:
192 if (info
.byte_order
== BFD_ENDIAN_BIG
)
193 tdep
->breakpoint
= tic6x_bkpt_illegal_opcode_be
;
195 tdep
->breakpoint
= tic6x_bkpt_illegal_opcode_le
;
199 if (info
.byte_order
== BFD_ENDIAN_BIG
)
200 tdep
->breakpoint
= tic6x_bkpt_bnop_be
;
202 tdep
->breakpoint
= tic6x_bkpt_bnop_le
;
207 /* Signal trampoline support. */
208 tramp_frame_prepend_unwinder (gdbarch
,
209 &tic6x_linux_rt_sigreturn_tramp_frame
);
212 /* Provide a prototype to silence -Wmissing-prototypes. */
213 extern initialize_file_ftype _initialize_tic6x_linux_tdep
;
216 _initialize_tic6x_linux_tdep (void)
218 gdbarch_register_osabi (bfd_arch_tic6x
, 0, GDB_OSABI_LINUX
,
219 tic6x_uclinux_init_abi
);
221 initialize_tdesc_tic6x_c64xp_linux ();
222 initialize_tdesc_tic6x_c64x_linux ();
223 initialize_tdesc_tic6x_c62x_linux ();