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faf5f7ad | 1 | /* GNU/Linux on ARM target support. |
0fd88904 | 2 | |
1c63d086 | 3 | Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 |
8e9d1a24 | 4 | Free Software Foundation, Inc. |
faf5f7ad SB |
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 | |
10 | the Free Software Foundation; either version 2 of the License, or | |
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 | |
19 | along with this program; if not, write to the Free Software | |
197e01b6 EZ |
20 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
21 | Boston, MA 02110-1301, USA. */ | |
faf5f7ad SB |
22 | |
23 | #include "defs.h" | |
c20f6dea SB |
24 | #include "target.h" |
25 | #include "value.h" | |
faf5f7ad | 26 | #include "gdbtypes.h" |
134e61c4 | 27 | #include "floatformat.h" |
2a451106 KB |
28 | #include "gdbcore.h" |
29 | #include "frame.h" | |
4e052eda | 30 | #include "regcache.h" |
d16aafd8 | 31 | #include "doublest.h" |
7aa1783e | 32 | #include "solib-svr4.h" |
4be87837 | 33 | #include "osabi.h" |
cb587d83 | 34 | #include "regset.h" |
8e9d1a24 DJ |
35 | #include "trad-frame.h" |
36 | #include "tramp-frame.h" | |
faf5f7ad | 37 | |
34e8f22d | 38 | #include "arm-tdep.h" |
cb587d83 | 39 | #include "arm-linux-tdep.h" |
0670c0aa | 40 | #include "glibc-tdep.h" |
a52e6aac | 41 | |
8e9d1a24 DJ |
42 | #include "gdb_string.h" |
43 | ||
cb587d83 DJ |
44 | extern int arm_apcs_32; |
45 | ||
fdf39c9a RE |
46 | /* Under ARM GNU/Linux the traditional way of performing a breakpoint |
47 | is to execute a particular software interrupt, rather than use a | |
48 | particular undefined instruction to provoke a trap. Upon exection | |
49 | of the software interrupt the kernel stops the inferior with a | |
498b1f87 | 50 | SIGTRAP, and wakes the debugger. */ |
66e810cd | 51 | |
2ef47cd0 DJ |
52 | static const char arm_linux_arm_le_breakpoint[] = { 0x01, 0x00, 0x9f, 0xef }; |
53 | ||
54 | static const char arm_linux_arm_be_breakpoint[] = { 0xef, 0x9f, 0x00, 0x01 }; | |
66e810cd | 55 | |
c75a2cc8 DJ |
56 | /* However, the EABI syscall interface (new in Nov. 2005) does not look at |
57 | the operand of the swi if old-ABI compatibility is disabled. Therefore, | |
58 | use an undefined instruction instead. This is supported as of kernel | |
59 | version 2.5.70 (May 2003), so should be a safe assumption for EABI | |
60 | binaries. */ | |
61 | ||
62 | static const char eabi_linux_arm_le_breakpoint[] = { 0xf0, 0x01, 0xf0, 0xe7 }; | |
63 | ||
64 | static const char eabi_linux_arm_be_breakpoint[] = { 0xe7, 0xf0, 0x01, 0xf0 }; | |
65 | ||
66 | /* All the kernels which support Thumb support using a specific undefined | |
67 | instruction for the Thumb breakpoint. */ | |
68 | ||
498b1f87 DJ |
69 | static const char arm_linux_thumb_be_breakpoint[] = {0xde, 0x01}; |
70 | ||
71 | static const char arm_linux_thumb_le_breakpoint[] = {0x01, 0xde}; | |
72 | ||
9df628e0 | 73 | /* Description of the longjmp buffer. */ |
7a5ea0d4 | 74 | #define ARM_LINUX_JB_ELEMENT_SIZE INT_REGISTER_SIZE |
a6cdd8c5 | 75 | #define ARM_LINUX_JB_PC 21 |
faf5f7ad | 76 | |
f38e884d | 77 | /* |
fdf39c9a RE |
78 | Dynamic Linking on ARM GNU/Linux |
79 | -------------------------------- | |
f38e884d SB |
80 | |
81 | Note: PLT = procedure linkage table | |
82 | GOT = global offset table | |
83 | ||
84 | As much as possible, ELF dynamic linking defers the resolution of | |
85 | jump/call addresses until the last minute. The technique used is | |
86 | inspired by the i386 ELF design, and is based on the following | |
87 | constraints. | |
88 | ||
89 | 1) The calling technique should not force a change in the assembly | |
90 | code produced for apps; it MAY cause changes in the way assembly | |
91 | code is produced for position independent code (i.e. shared | |
92 | libraries). | |
93 | ||
94 | 2) The technique must be such that all executable areas must not be | |
95 | modified; and any modified areas must not be executed. | |
96 | ||
97 | To do this, there are three steps involved in a typical jump: | |
98 | ||
99 | 1) in the code | |
100 | 2) through the PLT | |
101 | 3) using a pointer from the GOT | |
102 | ||
103 | When the executable or library is first loaded, each GOT entry is | |
104 | initialized to point to the code which implements dynamic name | |
105 | resolution and code finding. This is normally a function in the | |
fdf39c9a RE |
106 | program interpreter (on ARM GNU/Linux this is usually |
107 | ld-linux.so.2, but it does not have to be). On the first | |
108 | invocation, the function is located and the GOT entry is replaced | |
109 | with the real function address. Subsequent calls go through steps | |
110 | 1, 2 and 3 and end up calling the real code. | |
f38e884d SB |
111 | |
112 | 1) In the code: | |
113 | ||
114 | b function_call | |
115 | bl function_call | |
116 | ||
117 | This is typical ARM code using the 26 bit relative branch or branch | |
118 | and link instructions. The target of the instruction | |
119 | (function_call is usually the address of the function to be called. | |
120 | In position independent code, the target of the instruction is | |
121 | actually an entry in the PLT when calling functions in a shared | |
122 | library. Note that this call is identical to a normal function | |
123 | call, only the target differs. | |
124 | ||
125 | 2) In the PLT: | |
126 | ||
127 | The PLT is a synthetic area, created by the linker. It exists in | |
128 | both executables and libraries. It is an array of stubs, one per | |
129 | imported function call. It looks like this: | |
130 | ||
131 | PLT[0]: | |
132 | str lr, [sp, #-4]! @push the return address (lr) | |
133 | ldr lr, [pc, #16] @load from 6 words ahead | |
134 | add lr, pc, lr @form an address for GOT[0] | |
135 | ldr pc, [lr, #8]! @jump to the contents of that addr | |
136 | ||
137 | The return address (lr) is pushed on the stack and used for | |
138 | calculations. The load on the second line loads the lr with | |
139 | &GOT[3] - . - 20. The addition on the third leaves: | |
140 | ||
141 | lr = (&GOT[3] - . - 20) + (. + 8) | |
142 | lr = (&GOT[3] - 12) | |
143 | lr = &GOT[0] | |
144 | ||
145 | On the fourth line, the pc and lr are both updated, so that: | |
146 | ||
147 | pc = GOT[2] | |
148 | lr = &GOT[0] + 8 | |
149 | = &GOT[2] | |
150 | ||
151 | NOTE: PLT[0] borrows an offset .word from PLT[1]. This is a little | |
152 | "tight", but allows us to keep all the PLT entries the same size. | |
153 | ||
154 | PLT[n+1]: | |
155 | ldr ip, [pc, #4] @load offset from gotoff | |
156 | add ip, pc, ip @add the offset to the pc | |
157 | ldr pc, [ip] @jump to that address | |
158 | gotoff: .word GOT[n+3] - . | |
159 | ||
160 | The load on the first line, gets an offset from the fourth word of | |
161 | the PLT entry. The add on the second line makes ip = &GOT[n+3], | |
162 | which contains either a pointer to PLT[0] (the fixup trampoline) or | |
163 | a pointer to the actual code. | |
164 | ||
165 | 3) In the GOT: | |
166 | ||
167 | The GOT contains helper pointers for both code (PLT) fixups and | |
168 | data fixups. The first 3 entries of the GOT are special. The next | |
169 | M entries (where M is the number of entries in the PLT) belong to | |
170 | the PLT fixups. The next D (all remaining) entries belong to | |
171 | various data fixups. The actual size of the GOT is 3 + M + D. | |
172 | ||
173 | The GOT is also a synthetic area, created by the linker. It exists | |
174 | in both executables and libraries. When the GOT is first | |
175 | initialized , all the GOT entries relating to PLT fixups are | |
176 | pointing to code back at PLT[0]. | |
177 | ||
178 | The special entries in the GOT are: | |
179 | ||
180 | GOT[0] = linked list pointer used by the dynamic loader | |
181 | GOT[1] = pointer to the reloc table for this module | |
182 | GOT[2] = pointer to the fixup/resolver code | |
183 | ||
184 | The first invocation of function call comes through and uses the | |
185 | fixup/resolver code. On the entry to the fixup/resolver code: | |
186 | ||
187 | ip = &GOT[n+3] | |
188 | lr = &GOT[2] | |
189 | stack[0] = return address (lr) of the function call | |
190 | [r0, r1, r2, r3] are still the arguments to the function call | |
191 | ||
192 | This is enough information for the fixup/resolver code to work | |
193 | with. Before the fixup/resolver code returns, it actually calls | |
194 | the requested function and repairs &GOT[n+3]. */ | |
195 | ||
2a451106 KB |
196 | /* The constants below were determined by examining the following files |
197 | in the linux kernel sources: | |
198 | ||
199 | arch/arm/kernel/signal.c | |
200 | - see SWI_SYS_SIGRETURN and SWI_SYS_RT_SIGRETURN | |
201 | include/asm-arm/unistd.h | |
202 | - see __NR_sigreturn, __NR_rt_sigreturn, and __NR_SYSCALL_BASE */ | |
203 | ||
204 | #define ARM_LINUX_SIGRETURN_INSTR 0xef900077 | |
205 | #define ARM_LINUX_RT_SIGRETURN_INSTR 0xef9000ad | |
206 | ||
edfb1a26 DJ |
207 | /* For ARM EABI, the syscall number is not in the SWI instruction |
208 | (instead it is loaded into r7). We recognize the pattern that | |
209 | glibc uses... alternatively, we could arrange to do this by | |
210 | function name, but they are not always exported. */ | |
8e9d1a24 DJ |
211 | #define ARM_SET_R7_SIGRETURN 0xe3a07077 |
212 | #define ARM_SET_R7_RT_SIGRETURN 0xe3a070ad | |
213 | #define ARM_EABI_SYSCALL 0xef000000 | |
2a451106 | 214 | |
8e9d1a24 DJ |
215 | static void |
216 | arm_linux_sigtramp_cache (struct frame_info *next_frame, | |
217 | struct trad_frame_cache *this_cache, | |
218 | CORE_ADDR func, int regs_offset) | |
2a451106 | 219 | { |
8e9d1a24 DJ |
220 | CORE_ADDR sp = frame_unwind_register_unsigned (next_frame, ARM_SP_REGNUM); |
221 | CORE_ADDR base = sp + regs_offset; | |
222 | int i; | |
2a451106 | 223 | |
8e9d1a24 DJ |
224 | for (i = 0; i < 16; i++) |
225 | trad_frame_set_reg_addr (this_cache, i, base + i * 4); | |
2a451106 | 226 | |
8e9d1a24 | 227 | trad_frame_set_reg_addr (this_cache, ARM_PS_REGNUM, base + 16 * 4); |
2a451106 | 228 | |
8e9d1a24 DJ |
229 | /* The VFP or iWMMXt registers may be saved on the stack, but there's |
230 | no reliable way to restore them (yet). */ | |
2a451106 | 231 | |
8e9d1a24 DJ |
232 | /* Save a frame ID. */ |
233 | trad_frame_set_id (this_cache, frame_id_build (sp, func)); | |
234 | } | |
2a451106 | 235 | |
edfb1a26 DJ |
236 | /* There are a couple of different possible stack layouts that |
237 | we need to support. | |
238 | ||
239 | Before version 2.6.18, the kernel used completely independent | |
240 | layouts for non-RT and RT signals. For non-RT signals the stack | |
241 | began directly with a struct sigcontext. For RT signals the stack | |
242 | began with two redundant pointers (to the siginfo and ucontext), | |
243 | and then the siginfo and ucontext. | |
244 | ||
245 | As of version 2.6.18, the non-RT signal frame layout starts with | |
246 | a ucontext and the RT signal frame starts with a siginfo and then | |
247 | a ucontext. Also, the ucontext now has a designated save area | |
248 | for coprocessor registers. | |
249 | ||
250 | For RT signals, it's easy to tell the difference: we look for | |
251 | pinfo, the pointer to the siginfo. If it has the expected | |
252 | value, we have an old layout. If it doesn't, we have the new | |
253 | layout. | |
254 | ||
255 | For non-RT signals, it's a bit harder. We need something in one | |
256 | layout or the other with a recognizable offset and value. We can't | |
257 | use the return trampoline, because ARM usually uses SA_RESTORER, | |
258 | in which case the stack return trampoline is not filled in. | |
259 | We can't use the saved stack pointer, because sigaltstack might | |
260 | be in use. So for now we guess the new layout... */ | |
261 | ||
262 | /* There are three words (trap_no, error_code, oldmask) in | |
263 | struct sigcontext before r0. */ | |
264 | #define ARM_SIGCONTEXT_R0 0xc | |
265 | ||
266 | /* There are five words (uc_flags, uc_link, and three for uc_stack) | |
267 | in the ucontext_t before the sigcontext. */ | |
268 | #define ARM_UCONTEXT_SIGCONTEXT 0x14 | |
269 | ||
270 | /* There are three elements in an rt_sigframe before the ucontext: | |
271 | pinfo, puc, and info. The first two are pointers and the third | |
272 | is a struct siginfo, with size 128 bytes. We could follow puc | |
273 | to the ucontext, but it's simpler to skip the whole thing. */ | |
274 | #define ARM_OLD_RT_SIGFRAME_SIGINFO 0x8 | |
275 | #define ARM_OLD_RT_SIGFRAME_UCONTEXT 0x88 | |
276 | ||
277 | #define ARM_NEW_RT_SIGFRAME_UCONTEXT 0x80 | |
278 | ||
279 | #define ARM_NEW_SIGFRAME_MAGIC 0x5ac3c35a | |
280 | ||
8e9d1a24 DJ |
281 | static void |
282 | arm_linux_sigreturn_init (const struct tramp_frame *self, | |
283 | struct frame_info *next_frame, | |
284 | struct trad_frame_cache *this_cache, | |
285 | CORE_ADDR func) | |
2a451106 | 286 | { |
edfb1a26 DJ |
287 | CORE_ADDR sp = frame_unwind_register_unsigned (next_frame, ARM_SP_REGNUM); |
288 | ULONGEST uc_flags = read_memory_unsigned_integer (sp, 4); | |
289 | ||
290 | if (uc_flags == ARM_NEW_SIGFRAME_MAGIC) | |
291 | arm_linux_sigtramp_cache (next_frame, this_cache, func, | |
292 | ARM_UCONTEXT_SIGCONTEXT | |
293 | + ARM_SIGCONTEXT_R0); | |
294 | else | |
295 | arm_linux_sigtramp_cache (next_frame, this_cache, func, | |
296 | ARM_SIGCONTEXT_R0); | |
8e9d1a24 | 297 | } |
2a451106 | 298 | |
8e9d1a24 DJ |
299 | static void |
300 | arm_linux_rt_sigreturn_init (const struct tramp_frame *self, | |
301 | struct frame_info *next_frame, | |
302 | struct trad_frame_cache *this_cache, | |
303 | CORE_ADDR func) | |
304 | { | |
edfb1a26 DJ |
305 | CORE_ADDR sp = frame_unwind_register_unsigned (next_frame, ARM_SP_REGNUM); |
306 | ULONGEST pinfo = read_memory_unsigned_integer (sp, 4); | |
307 | ||
308 | if (pinfo == sp + ARM_OLD_RT_SIGFRAME_SIGINFO) | |
309 | arm_linux_sigtramp_cache (next_frame, this_cache, func, | |
310 | ARM_OLD_RT_SIGFRAME_UCONTEXT | |
311 | + ARM_UCONTEXT_SIGCONTEXT | |
312 | + ARM_SIGCONTEXT_R0); | |
313 | else | |
314 | arm_linux_sigtramp_cache (next_frame, this_cache, func, | |
315 | ARM_NEW_RT_SIGFRAME_UCONTEXT | |
316 | + ARM_UCONTEXT_SIGCONTEXT | |
317 | + ARM_SIGCONTEXT_R0); | |
2a451106 KB |
318 | } |
319 | ||
8e9d1a24 DJ |
320 | static struct tramp_frame arm_linux_sigreturn_tramp_frame = { |
321 | SIGTRAMP_FRAME, | |
322 | 4, | |
323 | { | |
324 | { ARM_LINUX_SIGRETURN_INSTR, -1 }, | |
325 | { TRAMP_SENTINEL_INSN } | |
326 | }, | |
327 | arm_linux_sigreturn_init | |
328 | }; | |
329 | ||
330 | static struct tramp_frame arm_linux_rt_sigreturn_tramp_frame = { | |
331 | SIGTRAMP_FRAME, | |
332 | 4, | |
333 | { | |
334 | { ARM_LINUX_RT_SIGRETURN_INSTR, -1 }, | |
335 | { TRAMP_SENTINEL_INSN } | |
336 | }, | |
337 | arm_linux_rt_sigreturn_init | |
338 | }; | |
339 | ||
340 | static struct tramp_frame arm_eabi_linux_sigreturn_tramp_frame = { | |
341 | SIGTRAMP_FRAME, | |
342 | 4, | |
343 | { | |
344 | { ARM_SET_R7_SIGRETURN, -1 }, | |
345 | { ARM_EABI_SYSCALL, -1 }, | |
346 | { TRAMP_SENTINEL_INSN } | |
347 | }, | |
348 | arm_linux_sigreturn_init | |
349 | }; | |
350 | ||
351 | static struct tramp_frame arm_eabi_linux_rt_sigreturn_tramp_frame = { | |
352 | SIGTRAMP_FRAME, | |
353 | 4, | |
354 | { | |
355 | { ARM_SET_R7_RT_SIGRETURN, -1 }, | |
356 | { ARM_EABI_SYSCALL, -1 }, | |
357 | { TRAMP_SENTINEL_INSN } | |
358 | }, | |
359 | arm_linux_rt_sigreturn_init | |
360 | }; | |
361 | ||
cb587d83 DJ |
362 | /* Core file and register set support. */ |
363 | ||
364 | #define ARM_LINUX_SIZEOF_GREGSET (18 * INT_REGISTER_SIZE) | |
365 | ||
366 | void | |
367 | arm_linux_supply_gregset (const struct regset *regset, | |
368 | struct regcache *regcache, | |
369 | int regnum, const void *gregs_buf, size_t len) | |
370 | { | |
371 | const gdb_byte *gregs = gregs_buf; | |
372 | int regno; | |
373 | CORE_ADDR reg_pc; | |
374 | gdb_byte pc_buf[INT_REGISTER_SIZE]; | |
375 | ||
376 | for (regno = ARM_A1_REGNUM; regno < ARM_PC_REGNUM; regno++) | |
377 | if (regnum == -1 || regnum == regno) | |
378 | regcache_raw_supply (regcache, regno, | |
379 | gregs + INT_REGISTER_SIZE * regno); | |
380 | ||
381 | if (regnum == ARM_PS_REGNUM || regnum == -1) | |
382 | { | |
383 | if (arm_apcs_32) | |
384 | regcache_raw_supply (regcache, ARM_PS_REGNUM, | |
385 | gregs + INT_REGISTER_SIZE * ARM_CPSR_REGNUM); | |
386 | else | |
387 | regcache_raw_supply (regcache, ARM_PS_REGNUM, | |
388 | gregs + INT_REGISTER_SIZE * ARM_PC_REGNUM); | |
389 | } | |
390 | ||
391 | if (regnum == ARM_PC_REGNUM || regnum == -1) | |
392 | { | |
393 | reg_pc = extract_unsigned_integer (gregs | |
394 | + INT_REGISTER_SIZE * ARM_PC_REGNUM, | |
395 | INT_REGISTER_SIZE); | |
396 | reg_pc = ADDR_BITS_REMOVE (reg_pc); | |
397 | store_unsigned_integer (pc_buf, INT_REGISTER_SIZE, reg_pc); | |
398 | regcache_raw_supply (regcache, ARM_PC_REGNUM, pc_buf); | |
399 | } | |
400 | } | |
401 | ||
402 | void | |
403 | arm_linux_collect_gregset (const struct regset *regset, | |
404 | const struct regcache *regcache, | |
405 | int regnum, void *gregs_buf, size_t len) | |
406 | { | |
407 | gdb_byte *gregs = gregs_buf; | |
408 | int regno; | |
409 | ||
410 | for (regno = ARM_A1_REGNUM; regno < ARM_PC_REGNUM; regno++) | |
411 | if (regnum == -1 || regnum == regno) | |
412 | regcache_raw_collect (regcache, regno, | |
413 | gregs + INT_REGISTER_SIZE * regno); | |
414 | ||
415 | if (regnum == ARM_PS_REGNUM || regnum == -1) | |
416 | { | |
417 | if (arm_apcs_32) | |
418 | regcache_raw_collect (regcache, ARM_PS_REGNUM, | |
419 | gregs + INT_REGISTER_SIZE * ARM_CPSR_REGNUM); | |
420 | else | |
421 | regcache_raw_collect (regcache, ARM_PS_REGNUM, | |
422 | gregs + INT_REGISTER_SIZE * ARM_PC_REGNUM); | |
423 | } | |
424 | ||
425 | if (regnum == ARM_PC_REGNUM || regnum == -1) | |
426 | regcache_raw_collect (regcache, ARM_PC_REGNUM, | |
427 | gregs + INT_REGISTER_SIZE * ARM_PC_REGNUM); | |
428 | } | |
429 | ||
430 | /* Support for register format used by the NWFPE FPA emulator. */ | |
431 | ||
432 | #define typeNone 0x00 | |
433 | #define typeSingle 0x01 | |
434 | #define typeDouble 0x02 | |
435 | #define typeExtended 0x03 | |
436 | ||
437 | void | |
438 | supply_nwfpe_register (struct regcache *regcache, int regno, | |
439 | const gdb_byte *regs) | |
440 | { | |
441 | const gdb_byte *reg_data; | |
442 | gdb_byte reg_tag; | |
443 | gdb_byte buf[FP_REGISTER_SIZE]; | |
444 | ||
445 | reg_data = regs + (regno - ARM_F0_REGNUM) * FP_REGISTER_SIZE; | |
446 | reg_tag = regs[(regno - ARM_F0_REGNUM) + NWFPE_TAGS_OFFSET]; | |
447 | memset (buf, 0, FP_REGISTER_SIZE); | |
448 | ||
449 | switch (reg_tag) | |
450 | { | |
451 | case typeSingle: | |
452 | memcpy (buf, reg_data, 4); | |
453 | break; | |
454 | case typeDouble: | |
455 | memcpy (buf, reg_data + 4, 4); | |
456 | memcpy (buf + 4, reg_data, 4); | |
457 | break; | |
458 | case typeExtended: | |
459 | /* We want sign and exponent, then least significant bits, | |
460 | then most significant. NWFPE does sign, most, least. */ | |
461 | memcpy (buf, reg_data, 4); | |
462 | memcpy (buf + 4, reg_data + 8, 4); | |
463 | memcpy (buf + 8, reg_data + 4, 4); | |
464 | break; | |
465 | default: | |
466 | break; | |
467 | } | |
468 | ||
469 | regcache_raw_supply (regcache, regno, buf); | |
470 | } | |
471 | ||
472 | void | |
473 | collect_nwfpe_register (const struct regcache *regcache, int regno, | |
474 | gdb_byte *regs) | |
475 | { | |
476 | gdb_byte *reg_data; | |
477 | gdb_byte reg_tag; | |
478 | gdb_byte buf[FP_REGISTER_SIZE]; | |
479 | ||
480 | regcache_raw_collect (regcache, regno, buf); | |
481 | ||
482 | /* NOTE drow/2006-06-07: This code uses the tag already in the | |
483 | register buffer. I've preserved that when moving the code | |
484 | from the native file to the target file. But this doesn't | |
485 | always make sense. */ | |
486 | ||
487 | reg_data = regs + (regno - ARM_F0_REGNUM) * FP_REGISTER_SIZE; | |
488 | reg_tag = regs[(regno - ARM_F0_REGNUM) + NWFPE_TAGS_OFFSET]; | |
489 | ||
490 | switch (reg_tag) | |
491 | { | |
492 | case typeSingle: | |
493 | memcpy (reg_data, buf, 4); | |
494 | break; | |
495 | case typeDouble: | |
496 | memcpy (reg_data, buf + 4, 4); | |
497 | memcpy (reg_data + 4, buf, 4); | |
498 | break; | |
499 | case typeExtended: | |
500 | memcpy (reg_data, buf, 4); | |
501 | memcpy (reg_data + 4, buf + 8, 4); | |
502 | memcpy (reg_data + 8, buf + 4, 4); | |
503 | break; | |
504 | default: | |
505 | break; | |
506 | } | |
507 | } | |
508 | ||
509 | void | |
510 | arm_linux_supply_nwfpe (const struct regset *regset, | |
511 | struct regcache *regcache, | |
512 | int regnum, const void *regs_buf, size_t len) | |
513 | { | |
514 | const gdb_byte *regs = regs_buf; | |
515 | int regno; | |
516 | ||
517 | if (regnum == ARM_FPS_REGNUM || regnum == -1) | |
518 | regcache_raw_supply (regcache, ARM_FPS_REGNUM, | |
519 | regs + NWFPE_FPSR_OFFSET); | |
520 | ||
521 | for (regno = ARM_F0_REGNUM; regno <= ARM_F7_REGNUM; regno++) | |
522 | if (regnum == -1 || regnum == regno) | |
523 | supply_nwfpe_register (regcache, regno, regs); | |
524 | } | |
525 | ||
526 | void | |
527 | arm_linux_collect_nwfpe (const struct regset *regset, | |
528 | const struct regcache *regcache, | |
529 | int regnum, void *regs_buf, size_t len) | |
530 | { | |
531 | gdb_byte *regs = regs_buf; | |
532 | int regno; | |
533 | ||
534 | for (regno = ARM_F0_REGNUM; regno <= ARM_F7_REGNUM; regno++) | |
535 | if (regnum == -1 || regnum == regno) | |
536 | collect_nwfpe_register (regcache, regno, regs); | |
537 | ||
538 | if (regnum == ARM_FPS_REGNUM || regnum == -1) | |
539 | regcache_raw_collect (regcache, ARM_FPS_REGNUM, | |
540 | regs + INT_REGISTER_SIZE * ARM_FPS_REGNUM); | |
541 | } | |
542 | ||
543 | /* Return the appropriate register set for the core section identified | |
544 | by SECT_NAME and SECT_SIZE. */ | |
545 | ||
546 | static const struct regset * | |
547 | arm_linux_regset_from_core_section (struct gdbarch *gdbarch, | |
548 | const char *sect_name, size_t sect_size) | |
549 | { | |
550 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
551 | ||
552 | if (strcmp (sect_name, ".reg") == 0 | |
553 | && sect_size == ARM_LINUX_SIZEOF_GREGSET) | |
554 | { | |
555 | if (tdep->gregset == NULL) | |
556 | tdep->gregset = regset_alloc (gdbarch, arm_linux_supply_gregset, | |
557 | arm_linux_collect_gregset); | |
558 | return tdep->gregset; | |
559 | } | |
560 | ||
561 | if (strcmp (sect_name, ".reg2") == 0 | |
562 | && sect_size == ARM_LINUX_SIZEOF_NWFPE) | |
563 | { | |
564 | if (tdep->fpregset == NULL) | |
565 | tdep->fpregset = regset_alloc (gdbarch, arm_linux_supply_nwfpe, | |
566 | arm_linux_collect_nwfpe); | |
567 | return tdep->fpregset; | |
568 | } | |
569 | ||
570 | return NULL; | |
571 | } | |
572 | ||
97e03143 RE |
573 | static void |
574 | arm_linux_init_abi (struct gdbarch_info info, | |
575 | struct gdbarch *gdbarch) | |
576 | { | |
577 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
578 | ||
579 | tdep->lowest_pc = 0x8000; | |
2ef47cd0 | 580 | if (info.byte_order == BFD_ENDIAN_BIG) |
498b1f87 | 581 | { |
c75a2cc8 DJ |
582 | if (tdep->arm_abi == ARM_ABI_AAPCS) |
583 | tdep->arm_breakpoint = eabi_linux_arm_be_breakpoint; | |
584 | else | |
585 | tdep->arm_breakpoint = arm_linux_arm_be_breakpoint; | |
498b1f87 DJ |
586 | tdep->thumb_breakpoint = arm_linux_thumb_be_breakpoint; |
587 | } | |
2ef47cd0 | 588 | else |
498b1f87 | 589 | { |
c75a2cc8 DJ |
590 | if (tdep->arm_abi == ARM_ABI_AAPCS) |
591 | tdep->arm_breakpoint = eabi_linux_arm_le_breakpoint; | |
592 | else | |
593 | tdep->arm_breakpoint = arm_linux_arm_le_breakpoint; | |
498b1f87 DJ |
594 | tdep->thumb_breakpoint = arm_linux_thumb_le_breakpoint; |
595 | } | |
66e810cd | 596 | tdep->arm_breakpoint_size = sizeof (arm_linux_arm_le_breakpoint); |
498b1f87 | 597 | tdep->thumb_breakpoint_size = sizeof (arm_linux_thumb_le_breakpoint); |
9df628e0 | 598 | |
28e97307 DJ |
599 | if (tdep->fp_model == ARM_FLOAT_AUTO) |
600 | tdep->fp_model = ARM_FLOAT_FPA; | |
fd50bc42 | 601 | |
a6cdd8c5 RE |
602 | tdep->jb_pc = ARM_LINUX_JB_PC; |
603 | tdep->jb_elt_size = ARM_LINUX_JB_ELEMENT_SIZE; | |
19d3fc80 | 604 | |
7aa1783e | 605 | set_solib_svr4_fetch_link_map_offsets |
76a9d10f | 606 | (gdbarch, svr4_ilp32_fetch_link_map_offsets); |
7aa1783e | 607 | |
190dce09 UW |
608 | /* Single stepping. */ |
609 | set_gdbarch_software_single_step (gdbarch, arm_software_single_step); | |
610 | ||
0e18d038 | 611 | /* Shared library handling. */ |
0e18d038 | 612 | set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); |
bb41a796 | 613 | set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver); |
b2756930 KB |
614 | |
615 | /* Enable TLS support. */ | |
616 | set_gdbarch_fetch_tls_load_module_address (gdbarch, | |
617 | svr4_fetch_objfile_link_map); | |
8e9d1a24 DJ |
618 | |
619 | tramp_frame_prepend_unwinder (gdbarch, | |
620 | &arm_linux_sigreturn_tramp_frame); | |
621 | tramp_frame_prepend_unwinder (gdbarch, | |
622 | &arm_linux_rt_sigreturn_tramp_frame); | |
623 | tramp_frame_prepend_unwinder (gdbarch, | |
624 | &arm_eabi_linux_sigreturn_tramp_frame); | |
625 | tramp_frame_prepend_unwinder (gdbarch, | |
626 | &arm_eabi_linux_rt_sigreturn_tramp_frame); | |
cb587d83 DJ |
627 | |
628 | /* Core file support. */ | |
629 | set_gdbarch_regset_from_core_section (gdbarch, | |
630 | arm_linux_regset_from_core_section); | |
97e03143 RE |
631 | } |
632 | ||
faf5f7ad SB |
633 | void |
634 | _initialize_arm_linux_tdep (void) | |
635 | { | |
05816f70 MK |
636 | gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_LINUX, |
637 | arm_linux_init_abi); | |
faf5f7ad | 638 | } |