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1 | /* Target-dependent code for the MIPS architecture running on IRIX, |
2 | for GDB, the GNU Debugger. | |
3 | ||
ecd75fc8 | 4 | Copyright (C) 2002-2014 Free Software Foundation, Inc. |
b96d0a4e KB |
5 | |
6 | This file is part of GDB. | |
7 | ||
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 | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
b96d0a4e KB |
11 | (at your option) any later version. |
12 | ||
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. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
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20 | |
21 | #include "defs.h" | |
22 | #include "osabi.h" | |
734598d9 UW |
23 | #include "solib.h" |
24 | #include "solib-irix.h" | |
b96d0a4e | 25 | #include "elf-bfd.h" |
6d8eadbd JB |
26 | #include "mips-tdep.h" |
27 | #include "trad-frame.h" | |
28 | #include "tramp-frame.h" | |
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29 | |
30 | static void | |
31 | mips_irix_elf_osabi_sniff_abi_tag_sections (bfd *abfd, asection *sect, | |
32 | void *obj) | |
33 | { | |
34 | enum gdb_osabi *os_ident_ptr = obj; | |
35 | const char *name; | |
36 | unsigned int sectsize; | |
37 | ||
38 | name = bfd_get_section_name (abfd, sect); | |
39 | sectsize = bfd_section_size (abfd, sect); | |
40 | ||
6e466374 MR |
41 | /* The presence of a section named with a ".MIPS." prefix is usually |
42 | indicative of an IRIX binary, however there are exceptions that | |
43 | are present universally, so check for those names and avoid | |
44 | switching away from the default OS ABI in the case of a match. */ | |
45 | if (strncmp (name, ".MIPS.", 6) == 0 | |
46 | && strcmp (name, ".MIPS.abiflags") != 0 | |
47 | && strcmp (name, ".MIPS.options") != 0 | |
48 | && strcmp (name, ".MIPS.stubs") != 0 | |
49 | && sectsize > 0) | |
50 | *os_ident_ptr = GDB_OSABI_IRIX; | |
b96d0a4e KB |
51 | } |
52 | ||
53 | static enum gdb_osabi | |
54 | mips_irix_elf_osabi_sniffer (bfd *abfd) | |
55 | { | |
56 | unsigned int elfosabi; | |
57 | enum gdb_osabi osabi = GDB_OSABI_UNKNOWN; | |
58 | ||
59 | /* If the generic sniffer gets a hit, return and let other sniffers | |
60 | get a crack at it. */ | |
61 | bfd_map_over_sections (abfd, | |
62 | generic_elf_osabi_sniff_abi_tag_sections, | |
63 | &osabi); | |
64 | if (osabi != GDB_OSABI_UNKNOWN) | |
65 | return GDB_OSABI_UNKNOWN; | |
66 | ||
67 | elfosabi = elf_elfheader (abfd)->e_ident[EI_OSABI]; | |
68 | ||
69 | if (elfosabi == ELFOSABI_NONE) | |
70 | { | |
71 | /* When elfosabi is ELFOSABI_NONE (0), then the ELF structures in the | |
72 | file are conforming to the base specification for that machine | |
73 | (there are no OS-specific extensions). In order to determine the | |
025bb325 | 74 | real OS in use we must look for OS notes that have been added. |
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75 | |
76 | For IRIX, we simply look for sections named with .MIPS. as | |
77 | prefixes. */ | |
78 | bfd_map_over_sections (abfd, | |
79 | mips_irix_elf_osabi_sniff_abi_tag_sections, | |
80 | &osabi); | |
81 | } | |
82 | return osabi; | |
83 | } | |
84 | ||
6d8eadbd JB |
85 | /* Unwinding past the signal handler on mips-irix. |
86 | ||
87 | Note: The following has only been tested with N32, but can probably | |
88 | be made to work with a small number of adjustments. | |
89 | ||
90 | On mips-irix, the sigcontext_t structure is stored at the base | |
91 | of the frame established by the _sigtramp function. The definition | |
92 | of this structure can be found in <sys/signal.h> (comments have been | |
93 | C++'ified to avoid a collision with the C-style comment delimiters | |
94 | used by this comment): | |
95 | ||
96 | typedef struct sigcontext { | |
97 | __uint32_t sc_regmask; // regs to restore in sigcleanup | |
98 | __uint32_t sc_status; // cp0 status register | |
99 | __uint64_t sc_pc; // pc at time of signal | |
100 | // General purpose registers | |
101 | __uint64_t sc_regs[32]; // processor regs 0 to 31 | |
102 | // Floating point coprocessor state | |
103 | __uint64_t sc_fpregs[32]; // fp regs 0 to 31 | |
104 | __uint32_t sc_ownedfp; // fp has been used | |
105 | __uint32_t sc_fpc_csr; // fpu control and status reg | |
106 | __uint32_t sc_fpc_eir; // fpu exception instruction reg | |
107 | // implementation/revision | |
108 | __uint32_t sc_ssflags; // signal stack state to restore | |
109 | __uint64_t sc_mdhi; // Multiplier hi and low regs | |
110 | __uint64_t sc_mdlo; | |
111 | // System coprocessor registers at time of signal | |
112 | __uint64_t sc_cause; // cp0 cause register | |
113 | __uint64_t sc_badvaddr; // cp0 bad virtual address | |
114 | __uint64_t sc_triggersave; // state of graphics trigger (SGI) | |
115 | sigset_t sc_sigset; // signal mask to restore | |
116 | __uint64_t sc_fp_rounded_result; // for Ieee 754 support | |
117 | __uint64_t sc_pad[31]; | |
118 | } sigcontext_t; | |
119 | ||
120 | The following macros provide the offset of some of the fields | |
121 | used to retrieve the value of the registers before the signal | |
122 | was raised. */ | |
123 | ||
124 | /* The size of the sigtramp frame. The sigtramp frame base can then | |
125 | be computed by adding this size to the SP. */ | |
126 | #define SIGTRAMP_FRAME_SIZE 48 | |
127 | /* The offset in sigcontext_t where the PC is saved. */ | |
128 | #define SIGCONTEXT_PC_OFF 8 | |
129 | /* The offset in sigcontext_t where the GP registers are saved. */ | |
130 | #define SIGCONTEXT_REGS_OFF (SIGCONTEXT_PC_OFF + 8) | |
131 | /* The offset in sigcontext_t where the FP regsiters are saved. */ | |
132 | #define SIGCONTEXT_FPREGS_OFF (SIGCONTEXT_REGS_OFF + 32 * 8) | |
133 | /* The offset in sigcontext_t where the FP CSR register is saved. */ | |
134 | #define SIGCONTEXT_FPCSR_OFF (SIGCONTEXT_FPREGS_OFF + 32 * 8 + 4) | |
135 | /* The offset in sigcontext_t where the multiplier hi register is saved. */ | |
136 | #define SIGCONTEXT_HI_OFF (SIGCONTEXT_FPCSR_OFF + 2 * 4) | |
137 | /* The offset in sigcontext_t where the multiplier lo register is saved. */ | |
138 | #define SIGCONTEXT_LO_OFF (SIGCONTEXT_HI_OFF + 4) | |
139 | ||
140 | /* Implement the "init" routine in struct tramp_frame for the N32 ABI | |
141 | on mips-irix. */ | |
142 | static void | |
143 | mips_irix_n32_tramp_frame_init (const struct tramp_frame *self, | |
144 | struct frame_info *this_frame, | |
145 | struct trad_frame_cache *this_cache, | |
146 | CORE_ADDR func) | |
147 | { | |
148 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
149 | const int num_regs = gdbarch_num_regs (gdbarch); | |
150 | int sp_cooked_regno = num_regs + MIPS_SP_REGNUM; | |
151 | const CORE_ADDR sp = get_frame_register_signed (this_frame, sp_cooked_regno); | |
152 | const CORE_ADDR sigcontext_base = sp + 48; | |
153 | const struct mips_regnum *regs = mips_regnum (gdbarch); | |
154 | int ireg; | |
155 | ||
156 | trad_frame_set_reg_addr (this_cache, regs->pc + gdbarch_num_regs (gdbarch), | |
157 | sigcontext_base + SIGCONTEXT_PC_OFF); | |
158 | ||
159 | for (ireg = 1; ireg < 32; ireg++) | |
160 | trad_frame_set_reg_addr (this_cache, ireg + MIPS_ZERO_REGNUM + num_regs, | |
161 | sigcontext_base + SIGCONTEXT_REGS_OFF + ireg * 8); | |
162 | ||
163 | for (ireg = 0; ireg < 32; ireg++) | |
164 | trad_frame_set_reg_addr (this_cache, ireg + regs->fp0 + num_regs, | |
165 | sigcontext_base + SIGCONTEXT_FPREGS_OFF | |
166 | + ireg * 8); | |
167 | ||
168 | trad_frame_set_reg_addr (this_cache, regs->fp_control_status + num_regs, | |
169 | sigcontext_base + SIGCONTEXT_FPCSR_OFF); | |
170 | ||
171 | trad_frame_set_reg_addr (this_cache, regs->hi + num_regs, | |
172 | sigcontext_base + SIGCONTEXT_HI_OFF); | |
173 | ||
174 | trad_frame_set_reg_addr (this_cache, regs->lo + num_regs, | |
175 | sigcontext_base + SIGCONTEXT_LO_OFF); | |
176 | ||
177 | trad_frame_set_id (this_cache, frame_id_build (sigcontext_base, func)); | |
178 | } | |
179 | ||
180 | /* The tramp_frame structure describing sigtramp frames on mips-irix N32. | |
181 | ||
182 | Note that the list of instructions below is pretty much a pure dump | |
183 | of function _sigtramp on mips-irix. A few instructions are actually | |
184 | not tested (mask set to 0), because a portion of these instructions | |
185 | contain an address which changes due to relocation. We could use | |
186 | a smarter mask that checks the instrutction code alone, but given | |
187 | the number of instructions already being checked, this seemed | |
188 | unnecessary. */ | |
189 | ||
190 | static const struct tramp_frame mips_irix_n32_tramp_frame = | |
191 | { | |
192 | SIGTRAMP_FRAME, | |
193 | 4, | |
194 | { | |
195 | { 0x3c0c8000, -1 }, /* lui t0,0x8000 */ | |
196 | { 0x27bdffd0, -1 }, /* addiu sp,sp,-48 */ | |
197 | { 0x008c6024, -1 }, /* and t0,a0,t0 */ | |
198 | { 0xffa40018, -1 }, /* sd a0,24(sp) */ | |
199 | { 0x00000000, 0 }, /* beqz t0,0xfaefcb8 <_sigtramp+40> */ | |
200 | { 0xffa60028, -1 }, /* sd a2,40(sp) */ | |
201 | { 0x01806027, -1 }, /* nor t0,t0,zero */ | |
202 | { 0xffa00020, -1 }, /* sd zero,32(sp) */ | |
203 | { 0x00000000, 0 }, /* b 0xfaefcbc <_sigtramp+44> */ | |
204 | { 0x008c2024, -1 }, /* and a0,a0,t0 */ | |
205 | { 0xffa60020, -1 }, /* sd a2,32(sp) */ | |
206 | { 0x03e0c025, -1 }, /* move t8,ra */ | |
207 | { 0x00000000, 0 }, /* bal 0xfaefcc8 <_sigtramp+56> */ | |
208 | { 0x00000000, -1 }, /* nop */ | |
209 | { 0x3c0c0007, -1 }, /* lui t0,0x7 */ | |
210 | { 0x00e0c825, -1 }, /* move t9,a3 */ | |
211 | { 0x658c80fc, -1 }, /* daddiu t0,t0,-32516 */ | |
212 | { 0x019f602d, -1 }, /* daddu t0,t0,ra */ | |
213 | { 0x0300f825, -1 }, /* move ra,t8 */ | |
214 | { 0x8d8c9880, -1 }, /* lw t0,-26496(t0) */ | |
215 | { 0x8d8c0000, -1 }, /* lw t0,0(t0) */ | |
216 | { 0x8d8d0000, -1 }, /* lw t1,0(t0) */ | |
217 | { 0xffac0008, -1 }, /* sd t0,8(sp) */ | |
218 | { 0x0320f809, -1 }, /* jalr t9 */ | |
219 | { 0xffad0010, -1 }, /* sd t1,16(sp) */ | |
220 | { 0xdfad0010, -1 }, /* ld t1,16(sp) */ | |
221 | { 0xdfac0008, -1 }, /* ld t0,8(sp) */ | |
222 | { 0xad8d0000, -1 }, /* sw t1,0(t0) */ | |
223 | { 0xdfa40020, -1 }, /* ld a0,32(sp) */ | |
224 | { 0xdfa50028, -1 }, /* ld a1,40(sp) */ | |
225 | { 0xdfa60018, -1 }, /* ld a2,24(sp) */ | |
226 | { 0x24020440, -1 }, /* li v0,1088 */ | |
227 | { 0x0000000c, -1 }, /* syscall */ | |
228 | { TRAMP_SENTINEL_INSN, -1 } | |
229 | }, | |
230 | mips_irix_n32_tramp_frame_init | |
231 | }; | |
232 | ||
1324a0d9 JB |
233 | /* Implement the "init" routine in struct tramp_frame for the stack-based |
234 | trampolines used on mips-irix. */ | |
235 | ||
236 | static void | |
237 | mips_irix_n32_stack_tramp_frame_init (const struct tramp_frame *self, | |
238 | struct frame_info *this_frame, | |
239 | struct trad_frame_cache *this_cache, | |
240 | CORE_ADDR func) | |
241 | { | |
242 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
243 | const int num_regs = gdbarch_num_regs (gdbarch); | |
244 | int sp_cooked_regno = num_regs + MIPS_SP_REGNUM; | |
245 | const CORE_ADDR sp = get_frame_register_signed (this_frame, sp_cooked_regno); | |
246 | ||
247 | /* The previous frame's PC is stored in RA. */ | |
248 | trad_frame_set_reg_realreg (this_cache, gdbarch_pc_regnum (gdbarch), | |
249 | num_regs + MIPS_RA_REGNUM); | |
250 | ||
251 | trad_frame_set_id (this_cache, frame_id_build (sp, func)); | |
252 | } | |
253 | ||
254 | /* A tramp_frame structure describing the stack-based trampoline | |
255 | used on mips-irix. These trampolines are created on the stack | |
256 | before being called. */ | |
257 | ||
258 | static const struct tramp_frame mips_irix_n32_stack_tramp_frame = | |
259 | { | |
260 | SIGTRAMP_FRAME, | |
261 | 4, | |
262 | { | |
263 | { 0x8f210000, 0xffff0000 }, /* lw at, N(t9) */ | |
264 | { 0x8f2f0000, 0xffff0000 }, /* lw t3, M(t9) */ | |
265 | { 0x00200008, 0xffffffff }, /* jr at */ | |
266 | { 0x0020c82d, 0xffffffff }, /* move t9, at */ | |
267 | { TRAMP_SENTINEL_INSN, -1 } | |
268 | }, | |
269 | mips_irix_n32_stack_tramp_frame_init | |
270 | }; | |
271 | ||
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272 | static void |
273 | mips_irix_init_abi (struct gdbarch_info info, | |
274 | struct gdbarch *gdbarch) | |
275 | { | |
734598d9 | 276 | set_solib_ops (gdbarch, &irix_so_ops); |
1324a0d9 | 277 | tramp_frame_prepend_unwinder (gdbarch, &mips_irix_n32_stack_tramp_frame); |
6d8eadbd | 278 | tramp_frame_prepend_unwinder (gdbarch, &mips_irix_n32_tramp_frame); |
b96d0a4e KB |
279 | } |
280 | ||
63807e1d PA |
281 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
282 | extern initialize_file_ftype _initialize_mips_irix_tdep; | |
283 | ||
b96d0a4e KB |
284 | void |
285 | _initialize_mips_irix_tdep (void) | |
286 | { | |
287 | /* Register an ELF OS ABI sniffer for IRIX binaries. */ | |
288 | gdbarch_register_osabi_sniffer (bfd_arch_mips, | |
289 | bfd_target_elf_flavour, | |
290 | mips_irix_elf_osabi_sniffer); | |
291 | ||
05816f70 | 292 | gdbarch_register_osabi (bfd_arch_mips, 0, GDB_OSABI_IRIX, |
b96d0a4e KB |
293 | mips_irix_init_abi); |
294 | } |