1 /* Target-dependent code for GNU/Linux on Nios II.
2 Copyright (C) 2012-2014 Free Software Foundation, Inc.
3 Contributed by Mentor Graphics, Inc.
5 This file is part of GDB.
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.
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.
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/>. */
23 #include "solib-svr4.h"
24 #include "trad-frame.h"
25 #include "tramp-frame.h"
29 #include "linux-tdep.h"
30 #include "glibc-tdep.h"
31 #include "nios2-tdep.h"
33 #include "features/nios2-linux.c"
35 /* Core file and register set support. */
37 /* Map from the normal register enumeration order to the order that
38 registers appear in core files, which corresponds to the order
39 of the register slots in the kernel's struct pt_regs. */
41 static const int reg_offsets
[NIOS2_NUM_REGS
] =
43 -1, 8, 9, 10, 11, 12, 13, 14, /* r0 - r7 */
44 0, 1, 2, 3, 4, 5, 6, 7, /* r8 - r15 */
45 23, 24, 25, 26, 27, 28, 29, 30, /* r16 - r23 */
46 -1, -1, 19, 18, 17, 21, -1, 16, /* et bt gp sp fp ea sstatus ra */
48 -1, 20, -1, -1, -1, -1, -1, -1, /* status estatus ... */
49 -1, -1, -1, -1, -1, -1, -1, -1
52 /* Implement the supply_regset hook for core files. */
55 nios2_supply_gregset (const struct regset
*regset
,
56 struct regcache
*regcache
,
57 int regnum
, const void *gregs_buf
, size_t len
)
59 const gdb_byte
*gregs
= gregs_buf
;
61 static const gdb_byte zero_buf
[4] = {0, 0, 0, 0};
63 for (regno
= NIOS2_Z_REGNUM
; regno
<= NIOS2_MPUACC_REGNUM
; regno
++)
64 if (regnum
== -1 || regnum
== regno
)
66 if (reg_offsets
[regno
] != -1)
67 regcache_raw_supply (regcache
, regno
,
68 gregs
+ 4 * reg_offsets
[regno
]);
70 regcache_raw_supply (regcache
, regno
, zero_buf
);
74 /* Implement the collect_regset hook for core files. */
77 nios2_collect_gregset (const struct regset
*regset
,
78 const struct regcache
*regcache
,
79 int regnum
, void *gregs_buf
, size_t len
)
81 gdb_byte
*gregs
= gregs_buf
;
84 for (regno
= NIOS2_Z_REGNUM
; regno
<= NIOS2_MPUACC_REGNUM
; regno
++)
85 if (regnum
== -1 || regnum
== regno
)
87 if (reg_offsets
[regno
] != -1)
88 regcache_raw_collect (regcache
, regno
,
89 gregs
+ 4 * reg_offsets
[regno
]);
93 static const struct regset nios2_core_regset
=
100 /* Implement the regset_from_core_section gdbarch method. */
102 static const struct regset
*
103 nios2_regset_from_core_section (struct gdbarch
*gdbarch
,
104 const char *sect_name
, size_t sect_size
)
106 if (strcmp (sect_name
, ".reg") == 0)
107 return &nios2_core_regset
;
112 /* Initialize a trad-frame cache corresponding to the tramp-frame.
113 FUNC is the address of the instruction TRAMP[0] in memory. */
116 nios2_linux_rt_sigreturn_init (const struct tramp_frame
*self
,
117 struct frame_info
*next_frame
,
118 struct trad_frame_cache
*this_cache
,
121 CORE_ADDR base
= func
+ 41 * 4;
124 for (i
= 0; i
< 23; i
++)
125 trad_frame_set_reg_addr (this_cache
, i
+ 1, base
+ i
* 4);
126 trad_frame_set_reg_addr (this_cache
, NIOS2_RA_REGNUM
, base
+ 23 * 4);
127 trad_frame_set_reg_addr (this_cache
, NIOS2_FP_REGNUM
, base
+ 24 * 4);
128 trad_frame_set_reg_addr (this_cache
, NIOS2_GP_REGNUM
, base
+ 25 * 4);
129 trad_frame_set_reg_addr (this_cache
, NIOS2_PC_REGNUM
, base
+ 27 * 4);
130 trad_frame_set_reg_addr (this_cache
, NIOS2_SP_REGNUM
, base
+ 28 * 4);
132 /* Save a frame ID. */
133 trad_frame_set_id (this_cache
, frame_id_build (base
, func
));
136 static struct tramp_frame nios2_linux_rt_sigreturn_tramp_frame
=
141 { 0x00800004 | (139 << 6), -1 }, /* movi r2,__NR_rt_sigreturn */
142 { 0x003b683a, -1 }, /* trap */
143 { TRAMP_SENTINEL_INSN
}
145 nios2_linux_rt_sigreturn_init
148 /* When FRAME is at a syscall instruction, return the PC of the next
149 instruction to be executed. */
152 nios2_linux_syscall_next_pc (struct frame_info
*frame
)
154 CORE_ADDR pc
= get_frame_pc (frame
);
155 ULONGEST syscall_nr
= get_frame_register_unsigned (frame
, NIOS2_R2_REGNUM
);
157 /* If we are about to make a sigreturn syscall, use the unwinder to
158 decode the signal frame. */
159 if (syscall_nr
== 139 /* rt_sigreturn */)
160 return frame_unwind_caller_pc (frame
);
162 return pc
+ NIOS2_OPCODE_SIZE
;
165 /* Hook function for gdbarch_register_osabi. */
168 nios2_linux_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
170 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
172 linux_init_abi (info
, gdbarch
);
174 /* Shared library handling. */
175 set_gdbarch_skip_trampoline_code (gdbarch
, find_solib_trampoline_target
);
176 set_gdbarch_skip_solib_resolver (gdbarch
, glibc_skip_solib_resolver
);
178 set_solib_svr4_fetch_link_map_offsets (gdbarch
,
179 svr4_ilp32_fetch_link_map_offsets
);
180 /* Enable TLS support. */
181 set_gdbarch_fetch_tls_load_module_address (gdbarch
,
182 svr4_fetch_objfile_link_map
);
183 /* Core file support. */
184 set_gdbarch_regset_from_core_section (gdbarch
,
185 nios2_regset_from_core_section
);
186 /* Linux signal frame unwinders. */
187 tramp_frame_prepend_unwinder (gdbarch
,
188 &nios2_linux_rt_sigreturn_tramp_frame
);
190 tdep
->syscall_next_pc
= nios2_linux_syscall_next_pc
;
192 /* Index of target address word in glibc jmp_buf. */
196 /* Provide a prototype to silence -Wmissing-prototypes. */
198 extern initialize_file_ftype _initialize_nios2_linux_tdep
;
201 _initialize_nios2_linux_tdep (void)
203 gdbarch_register_osabi (bfd_arch_nios2
, 0, GDB_OSABI_LINUX
,
204 nios2_linux_init_abi
);
206 initialize_tdesc_nios2_linux ();