Commit | Line | Data |
---|---|---|
ed9a39eb | 1 | /* Common target dependent code for GDB on ARM systems. |
b6ba6518 KB |
2 | Copyright 1988, 1989, 1991, 1992, 1993, 1995, 1996, 1998, 1999, 2000, |
3 | 2001 Free Software Foundation, Inc. | |
c906108c | 4 | |
c5aa993b | 5 | This file is part of GDB. |
c906108c | 6 | |
c5aa993b JM |
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 2 of the License, or | |
10 | (at your option) any later version. | |
c906108c | 11 | |
c5aa993b JM |
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. | |
c906108c | 16 | |
c5aa993b JM |
17 | You should have received a copy of the GNU General Public License |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
21 | |
22 | #include "defs.h" | |
23 | #include "frame.h" | |
24 | #include "inferior.h" | |
25 | #include "gdbcmd.h" | |
26 | #include "gdbcore.h" | |
27 | #include "symfile.h" | |
28 | #include "gdb_string.h" | |
29 | #include "coff/internal.h" /* Internal format of COFF symbols in BFD */ | |
e8b09175 | 30 | #include "dis-asm.h" /* For register flavors. */ |
30f6df08 | 31 | #include <ctype.h> /* for isupper () */ |
4e052eda | 32 | #include "regcache.h" |
d16aafd8 | 33 | #include "doublest.h" |
fd0407d6 | 34 | #include "value.h" |
a42dd537 | 35 | #include "solib-svr4.h" |
c906108c | 36 | |
2a451106 KB |
37 | /* Each OS has a different mechanism for accessing the various |
38 | registers stored in the sigcontext structure. | |
39 | ||
40 | SIGCONTEXT_REGISTER_ADDRESS should be defined to the name (or | |
41 | function pointer) which may be used to determine the addresses | |
42 | of the various saved registers in the sigcontext structure. | |
43 | ||
44 | For the ARM target, there are three parameters to this function. | |
45 | The first is the pc value of the frame under consideration, the | |
46 | second the stack pointer of this frame, and the last is the | |
47 | register number to fetch. | |
48 | ||
49 | If the tm.h file does not define this macro, then it's assumed that | |
50 | no mechanism is needed and we define SIGCONTEXT_REGISTER_ADDRESS to | |
51 | be 0. | |
52 | ||
53 | When it comes time to multi-arching this code, see the identically | |
54 | named machinery in ia64-tdep.c for an example of how it could be | |
55 | done. It should not be necessary to modify the code below where | |
56 | this macro is used. */ | |
57 | ||
3bb04bdd AC |
58 | #ifdef SIGCONTEXT_REGISTER_ADDRESS |
59 | #ifndef SIGCONTEXT_REGISTER_ADDRESS_P | |
60 | #define SIGCONTEXT_REGISTER_ADDRESS_P() 1 | |
61 | #endif | |
62 | #else | |
63 | #define SIGCONTEXT_REGISTER_ADDRESS(SP,PC,REG) 0 | |
64 | #define SIGCONTEXT_REGISTER_ADDRESS_P() 0 | |
2a451106 KB |
65 | #endif |
66 | ||
ed9a39eb JM |
67 | extern void _initialize_arm_tdep (void); |
68 | ||
bc90b915 FN |
69 | /* Number of different reg name sets (options). */ |
70 | static int num_flavor_options; | |
71 | ||
72 | /* We have more registers than the disassembler as gdb can print the value | |
73 | of special registers as well. | |
74 | The general register names are overwritten by whatever is being used by | |
75 | the disassembler at the moment. We also adjust the case of cpsr and fps. */ | |
76 | ||
77 | /* Initial value: Register names used in ARM's ISA documentation. */ | |
78 | static char * arm_register_name_strings[] = | |
da59e081 JM |
79 | {"r0", "r1", "r2", "r3", /* 0 1 2 3 */ |
80 | "r4", "r5", "r6", "r7", /* 4 5 6 7 */ | |
81 | "r8", "r9", "r10", "r11", /* 8 9 10 11 */ | |
82 | "r12", "sp", "lr", "pc", /* 12 13 14 15 */ | |
83 | "f0", "f1", "f2", "f3", /* 16 17 18 19 */ | |
84 | "f4", "f5", "f6", "f7", /* 20 21 22 23 */ | |
bc90b915 FN |
85 | "fps", "cpsr" }; /* 24 25 */ |
86 | char **arm_register_names = arm_register_name_strings; | |
ed9a39eb | 87 | |
bc90b915 | 88 | /* Valid register name flavors. */ |
53904c9e | 89 | static const char **valid_flavors; |
ed9a39eb | 90 | |
bc90b915 | 91 | /* Disassembly flavor to use. Default to "std" register names. */ |
53904c9e | 92 | static const char *disassembly_flavor; |
bc90b915 | 93 | static int current_option; /* Index to that option in the opcodes table. */ |
96baa820 | 94 | |
ed9a39eb JM |
95 | /* This is used to keep the bfd arch_info in sync with the disassembly |
96 | flavor. */ | |
97 | static void set_disassembly_flavor_sfunc(char *, int, | |
98 | struct cmd_list_element *); | |
99 | static void set_disassembly_flavor (void); | |
100 | ||
101 | static void convert_from_extended (void *ptr, void *dbl); | |
102 | ||
103 | /* Define other aspects of the stack frame. We keep the offsets of | |
104 | all saved registers, 'cause we need 'em a lot! We also keep the | |
105 | current size of the stack frame, and the offset of the frame | |
106 | pointer from the stack pointer (for frameless functions, and when | |
107 | we're still in the prologue of a function with a frame) */ | |
108 | ||
109 | struct frame_extra_info | |
110 | { | |
111 | struct frame_saved_regs fsr; | |
112 | int framesize; | |
113 | int frameoffset; | |
114 | int framereg; | |
115 | }; | |
116 | ||
bc90b915 FN |
117 | /* Addresses for calling Thumb functions have the bit 0 set. |
118 | Here are some macros to test, set, or clear bit 0 of addresses. */ | |
119 | #define IS_THUMB_ADDR(addr) ((addr) & 1) | |
120 | #define MAKE_THUMB_ADDR(addr) ((addr) | 1) | |
121 | #define UNMAKE_THUMB_ADDR(addr) ((addr) & ~1) | |
122 | ||
ed9a39eb JM |
123 | /* Will a function return an aggregate type in memory or in a |
124 | register? Return 0 if an aggregate type can be returned in a | |
125 | register, 1 if it must be returned in memory. */ | |
085dd6e6 | 126 | |
c906108c | 127 | int |
ed9a39eb | 128 | arm_use_struct_convention (int gcc_p, struct type *type) |
c906108c | 129 | { |
ed9a39eb JM |
130 | int nRc; |
131 | register enum type_code code; | |
132 | ||
133 | /* In the ARM ABI, "integer" like aggregate types are returned in | |
134 | registers. For an aggregate type to be integer like, its size | |
135 | must be less than or equal to REGISTER_SIZE and the offset of | |
136 | each addressable subfield must be zero. Note that bit fields are | |
137 | not addressable, and all addressable subfields of unions always | |
138 | start at offset zero. | |
139 | ||
140 | This function is based on the behaviour of GCC 2.95.1. | |
141 | See: gcc/arm.c: arm_return_in_memory() for details. | |
142 | ||
143 | Note: All versions of GCC before GCC 2.95.2 do not set up the | |
144 | parameters correctly for a function returning the following | |
145 | structure: struct { float f;}; This should be returned in memory, | |
146 | not a register. Richard Earnshaw sent me a patch, but I do not | |
147 | know of any way to detect if a function like the above has been | |
148 | compiled with the correct calling convention. */ | |
149 | ||
150 | /* All aggregate types that won't fit in a register must be returned | |
151 | in memory. */ | |
152 | if (TYPE_LENGTH (type) > REGISTER_SIZE) | |
153 | { | |
154 | return 1; | |
155 | } | |
156 | ||
157 | /* The only aggregate types that can be returned in a register are | |
158 | structs and unions. Arrays must be returned in memory. */ | |
159 | code = TYPE_CODE (type); | |
160 | if ((TYPE_CODE_STRUCT != code) && (TYPE_CODE_UNION != code)) | |
161 | { | |
162 | return 1; | |
163 | } | |
164 | ||
165 | /* Assume all other aggregate types can be returned in a register. | |
166 | Run a check for structures, unions and arrays. */ | |
167 | nRc = 0; | |
168 | ||
169 | if ((TYPE_CODE_STRUCT == code) || (TYPE_CODE_UNION == code)) | |
170 | { | |
171 | int i; | |
172 | /* Need to check if this struct/union is "integer" like. For | |
173 | this to be true, its size must be less than or equal to | |
174 | REGISTER_SIZE and the offset of each addressable subfield | |
175 | must be zero. Note that bit fields are not addressable, and | |
176 | unions always start at offset zero. If any of the subfields | |
177 | is a floating point type, the struct/union cannot be an | |
178 | integer type. */ | |
179 | ||
180 | /* For each field in the object, check: | |
181 | 1) Is it FP? --> yes, nRc = 1; | |
182 | 2) Is it addressable (bitpos != 0) and | |
183 | not packed (bitsize == 0)? | |
184 | --> yes, nRc = 1 | |
185 | */ | |
186 | ||
187 | for (i = 0; i < TYPE_NFIELDS (type); i++) | |
188 | { | |
189 | enum type_code field_type_code; | |
190 | field_type_code = TYPE_CODE (TYPE_FIELD_TYPE (type, i)); | |
191 | ||
192 | /* Is it a floating point type field? */ | |
193 | if (field_type_code == TYPE_CODE_FLT) | |
194 | { | |
195 | nRc = 1; | |
196 | break; | |
197 | } | |
198 | ||
199 | /* If bitpos != 0, then we have to care about it. */ | |
200 | if (TYPE_FIELD_BITPOS (type, i) != 0) | |
201 | { | |
202 | /* Bitfields are not addressable. If the field bitsize is | |
203 | zero, then the field is not packed. Hence it cannot be | |
204 | a bitfield or any other packed type. */ | |
205 | if (TYPE_FIELD_BITSIZE (type, i) == 0) | |
206 | { | |
207 | nRc = 1; | |
208 | break; | |
209 | } | |
210 | } | |
211 | } | |
212 | } | |
213 | ||
214 | return nRc; | |
c906108c SS |
215 | } |
216 | ||
217 | int | |
ed9a39eb | 218 | arm_frame_chain_valid (CORE_ADDR chain, struct frame_info *thisframe) |
c906108c | 219 | { |
c906108c SS |
220 | return (chain != 0 && (FRAME_SAVED_PC (thisframe) >= LOWEST_PC)); |
221 | } | |
222 | ||
223 | /* Set to true if the 32-bit mode is in use. */ | |
224 | ||
225 | int arm_apcs_32 = 1; | |
226 | ||
ed9a39eb JM |
227 | /* Flag set by arm_fix_call_dummy that tells whether the target |
228 | function is a Thumb function. This flag is checked by | |
229 | arm_push_arguments. FIXME: Change the PUSH_ARGUMENTS macro (and | |
230 | its use in valops.c) to pass the function address as an additional | |
231 | parameter. */ | |
c906108c SS |
232 | |
233 | static int target_is_thumb; | |
234 | ||
ed9a39eb JM |
235 | /* Flag set by arm_fix_call_dummy that tells whether the calling |
236 | function is a Thumb function. This flag is checked by | |
237 | arm_pc_is_thumb and arm_call_dummy_breakpoint_offset. */ | |
c906108c SS |
238 | |
239 | static int caller_is_thumb; | |
240 | ||
ed9a39eb JM |
241 | /* Determine if the program counter specified in MEMADDR is in a Thumb |
242 | function. */ | |
c906108c SS |
243 | |
244 | int | |
2a451106 | 245 | arm_pc_is_thumb (CORE_ADDR memaddr) |
c906108c | 246 | { |
c5aa993b | 247 | struct minimal_symbol *sym; |
c906108c | 248 | |
ed9a39eb | 249 | /* If bit 0 of the address is set, assume this is a Thumb address. */ |
c906108c SS |
250 | if (IS_THUMB_ADDR (memaddr)) |
251 | return 1; | |
252 | ||
ed9a39eb | 253 | /* Thumb functions have a "special" bit set in minimal symbols. */ |
c906108c SS |
254 | sym = lookup_minimal_symbol_by_pc (memaddr); |
255 | if (sym) | |
256 | { | |
c5aa993b | 257 | return (MSYMBOL_IS_SPECIAL (sym)); |
c906108c SS |
258 | } |
259 | else | |
ed9a39eb JM |
260 | { |
261 | return 0; | |
262 | } | |
c906108c SS |
263 | } |
264 | ||
ed9a39eb JM |
265 | /* Determine if the program counter specified in MEMADDR is in a call |
266 | dummy being called from a Thumb function. */ | |
c906108c SS |
267 | |
268 | int | |
2a451106 | 269 | arm_pc_is_thumb_dummy (CORE_ADDR memaddr) |
c906108c | 270 | { |
c5aa993b | 271 | CORE_ADDR sp = read_sp (); |
c906108c | 272 | |
dfcd3bfb JM |
273 | /* FIXME: Until we switch for the new call dummy macros, this heuristic |
274 | is the best we can do. We are trying to determine if the pc is on | |
275 | the stack, which (hopefully) will only happen in a call dummy. | |
276 | We hope the current stack pointer is not so far alway from the dummy | |
277 | frame location (true if we have not pushed large data structures or | |
278 | gone too many levels deep) and that our 1024 is not enough to consider | |
279 | code regions as part of the stack (true for most practical purposes) */ | |
280 | if (PC_IN_CALL_DUMMY (memaddr, sp, sp + 1024)) | |
c906108c SS |
281 | return caller_is_thumb; |
282 | else | |
283 | return 0; | |
284 | } | |
285 | ||
286 | CORE_ADDR | |
ed9a39eb | 287 | arm_addr_bits_remove (CORE_ADDR val) |
c906108c SS |
288 | { |
289 | if (arm_pc_is_thumb (val)) | |
290 | return (val & (arm_apcs_32 ? 0xfffffffe : 0x03fffffe)); | |
291 | else | |
292 | return (val & (arm_apcs_32 ? 0xfffffffc : 0x03fffffc)); | |
293 | } | |
294 | ||
295 | CORE_ADDR | |
ed9a39eb | 296 | arm_saved_pc_after_call (struct frame_info *frame) |
c906108c SS |
297 | { |
298 | return ADDR_BITS_REMOVE (read_register (LR_REGNUM)); | |
299 | } | |
300 | ||
392a587b | 301 | int |
ed9a39eb | 302 | arm_frameless_function_invocation (struct frame_info *fi) |
392a587b | 303 | { |
392a587b | 304 | CORE_ADDR func_start, after_prologue; |
96baa820 | 305 | int frameless; |
ed9a39eb | 306 | |
392a587b | 307 | func_start = (get_pc_function_start ((fi)->pc) + FUNCTION_START_OFFSET); |
7be570e7 | 308 | after_prologue = SKIP_PROLOGUE (func_start); |
ed9a39eb | 309 | |
96baa820 | 310 | /* There are some frameless functions whose first two instructions |
ed9a39eb JM |
311 | follow the standard APCS form, in which case after_prologue will |
312 | be func_start + 8. */ | |
313 | ||
96baa820 | 314 | frameless = (after_prologue < func_start + 12); |
392a587b JM |
315 | return frameless; |
316 | } | |
317 | ||
c906108c | 318 | /* A typical Thumb prologue looks like this: |
c5aa993b JM |
319 | push {r7, lr} |
320 | add sp, sp, #-28 | |
321 | add r7, sp, #12 | |
c906108c | 322 | Sometimes the latter instruction may be replaced by: |
da59e081 JM |
323 | mov r7, sp |
324 | ||
325 | or like this: | |
326 | push {r7, lr} | |
327 | mov r7, sp | |
328 | sub sp, #12 | |
329 | ||
330 | or, on tpcs, like this: | |
331 | sub sp,#16 | |
332 | push {r7, lr} | |
333 | (many instructions) | |
334 | mov r7, sp | |
335 | sub sp, #12 | |
336 | ||
337 | There is always one instruction of three classes: | |
338 | 1 - push | |
339 | 2 - setting of r7 | |
340 | 3 - adjusting of sp | |
341 | ||
342 | When we have found at least one of each class we are done with the prolog. | |
343 | Note that the "sub sp, #NN" before the push does not count. | |
ed9a39eb | 344 | */ |
c906108c SS |
345 | |
346 | static CORE_ADDR | |
c7885828 | 347 | thumb_skip_prologue (CORE_ADDR pc, CORE_ADDR func_end) |
c906108c SS |
348 | { |
349 | CORE_ADDR current_pc; | |
da59e081 JM |
350 | int findmask = 0; /* findmask: |
351 | bit 0 - push { rlist } | |
352 | bit 1 - mov r7, sp OR add r7, sp, #imm (setting of r7) | |
353 | bit 2 - sub sp, #simm OR add sp, #simm (adjusting of sp) | |
354 | */ | |
c906108c | 355 | |
c7885828 | 356 | for (current_pc = pc; current_pc + 2 < func_end && current_pc < pc + 40; current_pc += 2) |
c906108c SS |
357 | { |
358 | unsigned short insn = read_memory_unsigned_integer (current_pc, 2); | |
359 | ||
da59e081 JM |
360 | if ((insn & 0xfe00) == 0xb400) /* push { rlist } */ |
361 | { | |
362 | findmask |= 1; /* push found */ | |
363 | } | |
364 | else if ((insn & 0xff00) == 0xb000) /* add sp, #simm OR sub sp, #simm */ | |
365 | { | |
366 | if ((findmask & 1) == 0) /* before push ? */ | |
367 | continue; | |
368 | else | |
369 | findmask |= 4; /* add/sub sp found */ | |
370 | } | |
371 | else if ((insn & 0xff00) == 0xaf00) /* add r7, sp, #imm */ | |
372 | { | |
373 | findmask |= 2; /* setting of r7 found */ | |
374 | } | |
375 | else if (insn == 0x466f) /* mov r7, sp */ | |
376 | { | |
377 | findmask |= 2; /* setting of r7 found */ | |
378 | } | |
379 | else | |
380 | continue; /* something in the prolog that we don't care about or some | |
381 | instruction from outside the prolog scheduled here for optimization */ | |
c906108c SS |
382 | } |
383 | ||
384 | return current_pc; | |
385 | } | |
386 | ||
ed9a39eb JM |
387 | /* The APCS (ARM Procedure Call Standard) defines the following |
388 | prologue: | |
c906108c | 389 | |
c5aa993b JM |
390 | mov ip, sp |
391 | [stmfd sp!, {a1,a2,a3,a4}] | |
392 | stmfd sp!, {...,fp,ip,lr,pc} | |
ed9a39eb JM |
393 | [stfe f7, [sp, #-12]!] |
394 | [stfe f6, [sp, #-12]!] | |
395 | [stfe f5, [sp, #-12]!] | |
396 | [stfe f4, [sp, #-12]!] | |
397 | sub fp, ip, #nn @@ nn == 20 or 4 depending on second insn */ | |
c906108c SS |
398 | |
399 | CORE_ADDR | |
ed9a39eb | 400 | arm_skip_prologue (CORE_ADDR pc) |
c906108c SS |
401 | { |
402 | unsigned long inst; | |
403 | CORE_ADDR skip_pc; | |
404 | CORE_ADDR func_addr, func_end; | |
50f6fb4b | 405 | char *func_name; |
c906108c SS |
406 | struct symtab_and_line sal; |
407 | ||
96baa820 | 408 | /* See what the symbol table says. */ |
ed9a39eb | 409 | |
50f6fb4b | 410 | if (find_pc_partial_function (pc, &func_name, &func_addr, &func_end)) |
c906108c | 411 | { |
50f6fb4b CV |
412 | struct symbol *sym; |
413 | ||
414 | /* Found a function. */ | |
415 | sym = lookup_symbol (func_name, NULL, VAR_NAMESPACE, NULL, NULL); | |
416 | if (sym && SYMBOL_LANGUAGE (sym) != language_asm) | |
417 | { | |
418 | /* Don't use this trick for assembly source files. */ | |
419 | sal = find_pc_line (func_addr, 0); | |
420 | if ((sal.line != 0) && (sal.end < func_end)) | |
421 | return sal.end; | |
422 | } | |
c906108c SS |
423 | } |
424 | ||
425 | /* Check if this is Thumb code. */ | |
426 | if (arm_pc_is_thumb (pc)) | |
c7885828 | 427 | return thumb_skip_prologue (pc, func_end); |
c906108c SS |
428 | |
429 | /* Can't find the prologue end in the symbol table, try it the hard way | |
430 | by disassembling the instructions. */ | |
431 | skip_pc = pc; | |
432 | inst = read_memory_integer (skip_pc, 4); | |
c5aa993b | 433 | if (inst != 0xe1a0c00d) /* mov ip, sp */ |
c906108c SS |
434 | return pc; |
435 | ||
436 | skip_pc += 4; | |
437 | inst = read_memory_integer (skip_pc, 4); | |
c5aa993b | 438 | if ((inst & 0xfffffff0) == 0xe92d0000) /* stmfd sp!,{a1,a2,a3,a4} */ |
c906108c SS |
439 | { |
440 | skip_pc += 4; | |
441 | inst = read_memory_integer (skip_pc, 4); | |
442 | } | |
443 | ||
c5aa993b | 444 | if ((inst & 0xfffff800) != 0xe92dd800) /* stmfd sp!,{...,fp,ip,lr,pc} */ |
c906108c SS |
445 | return pc; |
446 | ||
447 | skip_pc += 4; | |
448 | inst = read_memory_integer (skip_pc, 4); | |
449 | ||
450 | /* Any insns after this point may float into the code, if it makes | |
ed9a39eb JM |
451 | for better instruction scheduling, so we skip them only if we |
452 | find them, but still consdier the function to be frame-ful. */ | |
c906108c | 453 | |
ed9a39eb JM |
454 | /* We may have either one sfmfd instruction here, or several stfe |
455 | insns, depending on the version of floating point code we | |
456 | support. */ | |
c5aa993b | 457 | if ((inst & 0xffbf0fff) == 0xec2d0200) /* sfmfd fn, <cnt>, [sp]! */ |
c906108c SS |
458 | { |
459 | skip_pc += 4; | |
460 | inst = read_memory_integer (skip_pc, 4); | |
461 | } | |
462 | else | |
463 | { | |
c5aa993b JM |
464 | while ((inst & 0xffff8fff) == 0xed6d0103) /* stfe fn, [sp, #-12]! */ |
465 | { | |
466 | skip_pc += 4; | |
467 | inst = read_memory_integer (skip_pc, 4); | |
468 | } | |
c906108c SS |
469 | } |
470 | ||
c5aa993b | 471 | if ((inst & 0xfffff000) == 0xe24cb000) /* sub fp, ip, #nn */ |
c906108c SS |
472 | skip_pc += 4; |
473 | ||
474 | return skip_pc; | |
475 | } | |
c5aa993b | 476 | /* *INDENT-OFF* */ |
c906108c SS |
477 | /* Function: thumb_scan_prologue (helper function for arm_scan_prologue) |
478 | This function decodes a Thumb function prologue to determine: | |
479 | 1) the size of the stack frame | |
480 | 2) which registers are saved on it | |
481 | 3) the offsets of saved regs | |
482 | 4) the offset from the stack pointer to the frame pointer | |
483 | This information is stored in the "extra" fields of the frame_info. | |
484 | ||
da59e081 JM |
485 | A typical Thumb function prologue would create this stack frame |
486 | (offsets relative to FP) | |
c906108c SS |
487 | old SP -> 24 stack parameters |
488 | 20 LR | |
489 | 16 R7 | |
490 | R7 -> 0 local variables (16 bytes) | |
491 | SP -> -12 additional stack space (12 bytes) | |
492 | The frame size would thus be 36 bytes, and the frame offset would be | |
da59e081 JM |
493 | 12 bytes. The frame register is R7. |
494 | ||
495 | The comments for thumb_skip_prolog() describe the algorithm we use to detect | |
496 | the end of the prolog */ | |
c5aa993b JM |
497 | /* *INDENT-ON* */ |
498 | ||
c906108c | 499 | static void |
ed9a39eb | 500 | thumb_scan_prologue (struct frame_info *fi) |
c906108c SS |
501 | { |
502 | CORE_ADDR prologue_start; | |
503 | CORE_ADDR prologue_end; | |
504 | CORE_ADDR current_pc; | |
c5aa993b | 505 | int saved_reg[16]; /* which register has been copied to register n? */ |
da59e081 JM |
506 | int findmask = 0; /* findmask: |
507 | bit 0 - push { rlist } | |
508 | bit 1 - mov r7, sp OR add r7, sp, #imm (setting of r7) | |
509 | bit 2 - sub sp, #simm OR add sp, #simm (adjusting of sp) | |
510 | */ | |
c5aa993b | 511 | int i; |
c906108c | 512 | |
c5aa993b | 513 | if (find_pc_partial_function (fi->pc, NULL, &prologue_start, &prologue_end)) |
c906108c SS |
514 | { |
515 | struct symtab_and_line sal = find_pc_line (prologue_start, 0); | |
516 | ||
c5aa993b | 517 | if (sal.line == 0) /* no line info, use current PC */ |
c906108c SS |
518 | prologue_end = fi->pc; |
519 | else if (sal.end < prologue_end) /* next line begins after fn end */ | |
c5aa993b | 520 | prologue_end = sal.end; /* (probably means no prologue) */ |
c906108c SS |
521 | } |
522 | else | |
c5aa993b JM |
523 | prologue_end = prologue_start + 40; /* We're in the boondocks: allow for */ |
524 | /* 16 pushes, an add, and "mv fp,sp" */ | |
c906108c SS |
525 | |
526 | prologue_end = min (prologue_end, fi->pc); | |
527 | ||
528 | /* Initialize the saved register map. When register H is copied to | |
529 | register L, we will put H in saved_reg[L]. */ | |
530 | for (i = 0; i < 16; i++) | |
531 | saved_reg[i] = i; | |
532 | ||
533 | /* Search the prologue looking for instructions that set up the | |
da59e081 JM |
534 | frame pointer, adjust the stack pointer, and save registers. |
535 | Do this until all basic prolog instructions are found. */ | |
c906108c SS |
536 | |
537 | fi->framesize = 0; | |
da59e081 JM |
538 | for (current_pc = prologue_start; |
539 | (current_pc < prologue_end) && ((findmask & 7) != 7); | |
540 | current_pc += 2) | |
c906108c SS |
541 | { |
542 | unsigned short insn; | |
543 | int regno; | |
544 | int offset; | |
545 | ||
546 | insn = read_memory_unsigned_integer (current_pc, 2); | |
547 | ||
c5aa993b | 548 | if ((insn & 0xfe00) == 0xb400) /* push { rlist } */ |
c906108c | 549 | { |
da59e081 JM |
550 | int mask; |
551 | findmask |= 1; /* push found */ | |
c906108c SS |
552 | /* Bits 0-7 contain a mask for registers R0-R7. Bit 8 says |
553 | whether to save LR (R14). */ | |
da59e081 | 554 | mask = (insn & 0xff) | ((insn & 0x100) << 6); |
c906108c SS |
555 | |
556 | /* Calculate offsets of saved R0-R7 and LR. */ | |
557 | for (regno = LR_REGNUM; regno >= 0; regno--) | |
558 | if (mask & (1 << regno)) | |
c5aa993b | 559 | { |
c906108c SS |
560 | fi->framesize += 4; |
561 | fi->fsr.regs[saved_reg[regno]] = -(fi->framesize); | |
562 | saved_reg[regno] = regno; /* reset saved register map */ | |
563 | } | |
564 | } | |
da59e081 | 565 | else if ((insn & 0xff00) == 0xb000) /* add sp, #simm OR sub sp, #simm */ |
c906108c | 566 | { |
da59e081 JM |
567 | if ((findmask & 1) == 0) /* before push ? */ |
568 | continue; | |
569 | else | |
570 | findmask |= 4; /* add/sub sp found */ | |
571 | ||
c5aa993b | 572 | offset = (insn & 0x7f) << 2; /* get scaled offset */ |
da59e081 JM |
573 | if (insn & 0x80) /* is it signed? (==subtracting) */ |
574 | { | |
575 | fi->frameoffset += offset; | |
576 | offset = -offset; | |
577 | } | |
c906108c SS |
578 | fi->framesize -= offset; |
579 | } | |
580 | else if ((insn & 0xff00) == 0xaf00) /* add r7, sp, #imm */ | |
581 | { | |
da59e081 | 582 | findmask |= 2; /* setting of r7 found */ |
c906108c | 583 | fi->framereg = THUMB_FP_REGNUM; |
c5aa993b | 584 | fi->frameoffset = (insn & 0xff) << 2; /* get scaled offset */ |
c906108c | 585 | } |
da59e081 | 586 | else if (insn == 0x466f) /* mov r7, sp */ |
c906108c | 587 | { |
da59e081 | 588 | findmask |= 2; /* setting of r7 found */ |
c906108c SS |
589 | fi->framereg = THUMB_FP_REGNUM; |
590 | fi->frameoffset = 0; | |
591 | saved_reg[THUMB_FP_REGNUM] = SP_REGNUM; | |
592 | } | |
593 | else if ((insn & 0xffc0) == 0x4640) /* mov r0-r7, r8-r15 */ | |
594 | { | |
c5aa993b | 595 | int lo_reg = insn & 7; /* dest. register (r0-r7) */ |
c906108c | 596 | int hi_reg = ((insn >> 3) & 7) + 8; /* source register (r8-15) */ |
c5aa993b | 597 | saved_reg[lo_reg] = hi_reg; /* remember hi reg was saved */ |
c906108c SS |
598 | } |
599 | else | |
da59e081 JM |
600 | continue; /* something in the prolog that we don't care about or some |
601 | instruction from outside the prolog scheduled here for optimization */ | |
c906108c SS |
602 | } |
603 | } | |
604 | ||
ed9a39eb JM |
605 | /* Check if prologue for this frame's PC has already been scanned. If |
606 | it has, copy the relevant information about that prologue and | |
c906108c SS |
607 | return non-zero. Otherwise do not copy anything and return zero. |
608 | ||
609 | The information saved in the cache includes: | |
c5aa993b JM |
610 | * the frame register number; |
611 | * the size of the stack frame; | |
612 | * the offsets of saved regs (relative to the old SP); and | |
613 | * the offset from the stack pointer to the frame pointer | |
c906108c | 614 | |
ed9a39eb JM |
615 | The cache contains only one entry, since this is adequate for the |
616 | typical sequence of prologue scan requests we get. When performing | |
617 | a backtrace, GDB will usually ask to scan the same function twice | |
618 | in a row (once to get the frame chain, and once to fill in the | |
619 | extra frame information). */ | |
c906108c SS |
620 | |
621 | static struct frame_info prologue_cache; | |
622 | ||
623 | static int | |
ed9a39eb | 624 | check_prologue_cache (struct frame_info *fi) |
c906108c SS |
625 | { |
626 | int i; | |
627 | ||
628 | if (fi->pc == prologue_cache.pc) | |
629 | { | |
630 | fi->framereg = prologue_cache.framereg; | |
631 | fi->framesize = prologue_cache.framesize; | |
632 | fi->frameoffset = prologue_cache.frameoffset; | |
911413e6 | 633 | for (i = 0; i < NUM_REGS; i++) |
c906108c SS |
634 | fi->fsr.regs[i] = prologue_cache.fsr.regs[i]; |
635 | return 1; | |
636 | } | |
637 | else | |
638 | return 0; | |
639 | } | |
640 | ||
641 | ||
ed9a39eb | 642 | /* Copy the prologue information from fi to the prologue cache. */ |
c906108c SS |
643 | |
644 | static void | |
ed9a39eb | 645 | save_prologue_cache (struct frame_info *fi) |
c906108c SS |
646 | { |
647 | int i; | |
648 | ||
c5aa993b JM |
649 | prologue_cache.pc = fi->pc; |
650 | prologue_cache.framereg = fi->framereg; | |
651 | prologue_cache.framesize = fi->framesize; | |
c906108c | 652 | prologue_cache.frameoffset = fi->frameoffset; |
c5aa993b | 653 | |
911413e6 | 654 | for (i = 0; i < NUM_REGS; i++) |
c906108c SS |
655 | prologue_cache.fsr.regs[i] = fi->fsr.regs[i]; |
656 | } | |
657 | ||
658 | ||
ed9a39eb | 659 | /* This function decodes an ARM function prologue to determine: |
c5aa993b JM |
660 | 1) the size of the stack frame |
661 | 2) which registers are saved on it | |
662 | 3) the offsets of saved regs | |
663 | 4) the offset from the stack pointer to the frame pointer | |
c906108c SS |
664 | This information is stored in the "extra" fields of the frame_info. |
665 | ||
96baa820 JM |
666 | There are two basic forms for the ARM prologue. The fixed argument |
667 | function call will look like: | |
ed9a39eb JM |
668 | |
669 | mov ip, sp | |
670 | stmfd sp!, {fp, ip, lr, pc} | |
671 | sub fp, ip, #4 | |
672 | [sub sp, sp, #4] | |
96baa820 | 673 | |
c906108c | 674 | Which would create this stack frame (offsets relative to FP): |
ed9a39eb JM |
675 | IP -> 4 (caller's stack) |
676 | FP -> 0 PC (points to address of stmfd instruction + 8 in callee) | |
677 | -4 LR (return address in caller) | |
678 | -8 IP (copy of caller's SP) | |
679 | -12 FP (caller's FP) | |
680 | SP -> -28 Local variables | |
681 | ||
c906108c | 682 | The frame size would thus be 32 bytes, and the frame offset would be |
96baa820 JM |
683 | 28 bytes. The stmfd call can also save any of the vN registers it |
684 | plans to use, which increases the frame size accordingly. | |
685 | ||
686 | Note: The stored PC is 8 off of the STMFD instruction that stored it | |
687 | because the ARM Store instructions always store PC + 8 when you read | |
688 | the PC register. | |
ed9a39eb | 689 | |
96baa820 JM |
690 | A variable argument function call will look like: |
691 | ||
ed9a39eb JM |
692 | mov ip, sp |
693 | stmfd sp!, {a1, a2, a3, a4} | |
694 | stmfd sp!, {fp, ip, lr, pc} | |
695 | sub fp, ip, #20 | |
696 | ||
96baa820 | 697 | Which would create this stack frame (offsets relative to FP): |
ed9a39eb JM |
698 | IP -> 20 (caller's stack) |
699 | 16 A4 | |
700 | 12 A3 | |
701 | 8 A2 | |
702 | 4 A1 | |
703 | FP -> 0 PC (points to address of stmfd instruction + 8 in callee) | |
704 | -4 LR (return address in caller) | |
705 | -8 IP (copy of caller's SP) | |
706 | -12 FP (caller's FP) | |
707 | SP -> -28 Local variables | |
96baa820 JM |
708 | |
709 | The frame size would thus be 48 bytes, and the frame offset would be | |
710 | 28 bytes. | |
711 | ||
712 | There is another potential complication, which is that the optimizer | |
713 | will try to separate the store of fp in the "stmfd" instruction from | |
714 | the "sub fp, ip, #NN" instruction. Almost anything can be there, so | |
715 | we just key on the stmfd, and then scan for the "sub fp, ip, #NN"... | |
716 | ||
717 | Also, note, the original version of the ARM toolchain claimed that there | |
718 | should be an | |
719 | ||
720 | instruction at the end of the prologue. I have never seen GCC produce | |
721 | this, and the ARM docs don't mention it. We still test for it below in | |
722 | case it happens... | |
ed9a39eb JM |
723 | |
724 | */ | |
c906108c SS |
725 | |
726 | static void | |
ed9a39eb | 727 | arm_scan_prologue (struct frame_info *fi) |
c906108c SS |
728 | { |
729 | int regno, sp_offset, fp_offset; | |
16a0f3e7 | 730 | LONGEST return_value; |
c906108c SS |
731 | CORE_ADDR prologue_start, prologue_end, current_pc; |
732 | ||
733 | /* Check if this function is already in the cache of frame information. */ | |
734 | if (check_prologue_cache (fi)) | |
735 | return; | |
736 | ||
737 | /* Assume there is no frame until proven otherwise. */ | |
c5aa993b JM |
738 | fi->framereg = SP_REGNUM; |
739 | fi->framesize = 0; | |
c906108c SS |
740 | fi->frameoffset = 0; |
741 | ||
742 | /* Check for Thumb prologue. */ | |
743 | if (arm_pc_is_thumb (fi->pc)) | |
744 | { | |
745 | thumb_scan_prologue (fi); | |
746 | save_prologue_cache (fi); | |
747 | return; | |
748 | } | |
749 | ||
750 | /* Find the function prologue. If we can't find the function in | |
751 | the symbol table, peek in the stack frame to find the PC. */ | |
752 | if (find_pc_partial_function (fi->pc, NULL, &prologue_start, &prologue_end)) | |
753 | { | |
2a451106 KB |
754 | /* One way to find the end of the prologue (which works well |
755 | for unoptimized code) is to do the following: | |
756 | ||
757 | struct symtab_and_line sal = find_pc_line (prologue_start, 0); | |
758 | ||
759 | if (sal.line == 0) | |
760 | prologue_end = fi->pc; | |
761 | else if (sal.end < prologue_end) | |
762 | prologue_end = sal.end; | |
763 | ||
764 | This mechanism is very accurate so long as the optimizer | |
765 | doesn't move any instructions from the function body into the | |
766 | prologue. If this happens, sal.end will be the last | |
767 | instruction in the first hunk of prologue code just before | |
768 | the first instruction that the scheduler has moved from | |
769 | the body to the prologue. | |
770 | ||
771 | In order to make sure that we scan all of the prologue | |
772 | instructions, we use a slightly less accurate mechanism which | |
773 | may scan more than necessary. To help compensate for this | |
774 | lack of accuracy, the prologue scanning loop below contains | |
775 | several clauses which'll cause the loop to terminate early if | |
776 | an implausible prologue instruction is encountered. | |
777 | ||
778 | The expression | |
779 | ||
780 | prologue_start + 64 | |
781 | ||
782 | is a suitable endpoint since it accounts for the largest | |
783 | possible prologue plus up to five instructions inserted by | |
784 | the scheduler. */ | |
785 | ||
786 | if (prologue_end > prologue_start + 64) | |
787 | { | |
788 | prologue_end = prologue_start + 64; /* See above. */ | |
789 | } | |
c906108c SS |
790 | } |
791 | else | |
792 | { | |
793 | /* Get address of the stmfd in the prologue of the callee; the saved | |
96baa820 | 794 | PC is the address of the stmfd + 8. */ |
16a0f3e7 EZ |
795 | if (!safe_read_memory_integer (fi->frame, 4, &return_value)) |
796 | return; | |
797 | else | |
798 | { | |
799 | prologue_start = ADDR_BITS_REMOVE (return_value) - 8; | |
800 | prologue_end = prologue_start + 64; /* See above. */ | |
801 | } | |
c906108c SS |
802 | } |
803 | ||
804 | /* Now search the prologue looking for instructions that set up the | |
96baa820 | 805 | frame pointer, adjust the stack pointer, and save registers. |
ed9a39eb | 806 | |
96baa820 JM |
807 | Be careful, however, and if it doesn't look like a prologue, |
808 | don't try to scan it. If, for instance, a frameless function | |
809 | begins with stmfd sp!, then we will tell ourselves there is | |
810 | a frame, which will confuse stack traceback, as well ad"finish" | |
811 | and other operations that rely on a knowledge of the stack | |
812 | traceback. | |
813 | ||
814 | In the APCS, the prologue should start with "mov ip, sp" so | |
d4473757 KB |
815 | if we don't see this as the first insn, we will stop. [Note: |
816 | This doesn't seem to be true any longer, so it's now an optional | |
817 | part of the prologue. - Kevin Buettner, 2001-11-20] */ | |
c906108c SS |
818 | |
819 | sp_offset = fp_offset = 0; | |
c906108c | 820 | |
ed9a39eb JM |
821 | if (read_memory_unsigned_integer (prologue_start, 4) |
822 | == 0xe1a0c00d) /* mov ip, sp */ | |
d4473757 KB |
823 | current_pc = prologue_start + 4; |
824 | else | |
825 | current_pc = prologue_start; | |
826 | ||
827 | for (; current_pc < prologue_end; current_pc += 4) | |
96baa820 | 828 | { |
d4473757 KB |
829 | unsigned int insn = read_memory_unsigned_integer (current_pc, 4); |
830 | ||
831 | if ((insn & 0xffff0000) == 0xe92d0000) | |
832 | /* stmfd sp!, {..., fp, ip, lr, pc} | |
833 | or | |
834 | stmfd sp!, {a1, a2, a3, a4} */ | |
c906108c | 835 | { |
d4473757 | 836 | int mask = insn & 0xffff; |
ed9a39eb | 837 | |
d4473757 KB |
838 | /* Calculate offsets of saved registers. */ |
839 | for (regno = PC_REGNUM; regno >= 0; regno--) | |
840 | if (mask & (1 << regno)) | |
841 | { | |
842 | sp_offset -= 4; | |
843 | fi->fsr.regs[regno] = sp_offset; | |
844 | } | |
845 | } | |
846 | else if ((insn & 0xfffff000) == 0xe24cb000) /* sub fp, ip #n */ | |
847 | { | |
848 | unsigned imm = insn & 0xff; /* immediate value */ | |
849 | unsigned rot = (insn & 0xf00) >> 7; /* rotate amount */ | |
850 | imm = (imm >> rot) | (imm << (32 - rot)); | |
851 | fp_offset = -imm; | |
852 | fi->framereg = FP_REGNUM; | |
853 | } | |
854 | else if ((insn & 0xfffff000) == 0xe24dd000) /* sub sp, sp #n */ | |
855 | { | |
856 | unsigned imm = insn & 0xff; /* immediate value */ | |
857 | unsigned rot = (insn & 0xf00) >> 7; /* rotate amount */ | |
858 | imm = (imm >> rot) | (imm << (32 - rot)); | |
859 | sp_offset -= imm; | |
860 | } | |
861 | else if ((insn & 0xffff7fff) == 0xed6d0103) /* stfe f?, [sp, -#c]! */ | |
862 | { | |
863 | sp_offset -= 12; | |
864 | regno = F0_REGNUM + ((insn >> 12) & 0x07); | |
865 | fi->fsr.regs[regno] = sp_offset; | |
866 | } | |
867 | else if ((insn & 0xffbf0fff) == 0xec2d0200) /* sfmfd f0, 4, [sp!] */ | |
868 | { | |
869 | int n_saved_fp_regs; | |
870 | unsigned int fp_start_reg, fp_bound_reg; | |
871 | ||
872 | if ((insn & 0x800) == 0x800) /* N0 is set */ | |
96baa820 | 873 | { |
d4473757 KB |
874 | if ((insn & 0x40000) == 0x40000) /* N1 is set */ |
875 | n_saved_fp_regs = 3; | |
876 | else | |
877 | n_saved_fp_regs = 1; | |
96baa820 | 878 | } |
d4473757 | 879 | else |
96baa820 | 880 | { |
d4473757 KB |
881 | if ((insn & 0x40000) == 0x40000) /* N1 is set */ |
882 | n_saved_fp_regs = 2; | |
883 | else | |
884 | n_saved_fp_regs = 4; | |
96baa820 | 885 | } |
d4473757 KB |
886 | |
887 | fp_start_reg = F0_REGNUM + ((insn >> 12) & 0x7); | |
888 | fp_bound_reg = fp_start_reg + n_saved_fp_regs; | |
889 | for (; fp_start_reg < fp_bound_reg; fp_start_reg++) | |
96baa820 JM |
890 | { |
891 | sp_offset -= 12; | |
d4473757 | 892 | fi->fsr.regs[fp_start_reg++] = sp_offset; |
96baa820 | 893 | } |
c906108c | 894 | } |
d4473757 KB |
895 | else if ((insn & 0xf0000000) != 0xe0000000) |
896 | break; /* Condition not true, exit early */ | |
897 | else if ((insn & 0xfe200000) == 0xe8200000) /* ldm? */ | |
898 | break; /* Don't scan past a block load */ | |
899 | else | |
900 | /* The optimizer might shove anything into the prologue, | |
901 | so we just skip what we don't recognize. */ | |
902 | continue; | |
c906108c SS |
903 | } |
904 | ||
905 | /* The frame size is just the negative of the offset (from the original SP) | |
906 | of the last thing thing we pushed on the stack. The frame offset is | |
907 | [new FP] - [new SP]. */ | |
908 | fi->framesize = -sp_offset; | |
d4473757 KB |
909 | if (fi->framereg == FP_REGNUM) |
910 | fi->frameoffset = fp_offset - sp_offset; | |
911 | else | |
912 | fi->frameoffset = 0; | |
ed9a39eb | 913 | |
c906108c SS |
914 | save_prologue_cache (fi); |
915 | } | |
916 | ||
ed9a39eb JM |
917 | /* Find REGNUM on the stack. Otherwise, it's in an active register. |
918 | One thing we might want to do here is to check REGNUM against the | |
919 | clobber mask, and somehow flag it as invalid if it isn't saved on | |
920 | the stack somewhere. This would provide a graceful failure mode | |
921 | when trying to get the value of caller-saves registers for an inner | |
922 | frame. */ | |
c906108c SS |
923 | |
924 | static CORE_ADDR | |
ed9a39eb | 925 | arm_find_callers_reg (struct frame_info *fi, int regnum) |
c906108c SS |
926 | { |
927 | for (; fi; fi = fi->next) | |
c5aa993b JM |
928 | |
929 | #if 0 /* FIXME: enable this code if we convert to new call dummy scheme. */ | |
c906108c SS |
930 | if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) |
931 | return generic_read_register_dummy (fi->pc, fi->frame, regnum); | |
932 | else | |
933 | #endif | |
c5aa993b JM |
934 | if (fi->fsr.regs[regnum] != 0) |
935 | return read_memory_integer (fi->fsr.regs[regnum], | |
936 | REGISTER_RAW_SIZE (regnum)); | |
c906108c SS |
937 | return read_register (regnum); |
938 | } | |
c5aa993b | 939 | /* *INDENT-OFF* */ |
c906108c SS |
940 | /* Function: frame_chain |
941 | Given a GDB frame, determine the address of the calling function's frame. | |
942 | This will be used to create a new GDB frame struct, and then | |
943 | INIT_EXTRA_FRAME_INFO and INIT_FRAME_PC will be called for the new frame. | |
944 | For ARM, we save the frame size when we initialize the frame_info. | |
945 | ||
946 | The original definition of this function was a macro in tm-arm.h: | |
947 | { In the case of the ARM, the frame's nominal address is the FP value, | |
948 | and 12 bytes before comes the saved previous FP value as a 4-byte word. } | |
949 | ||
950 | #define FRAME_CHAIN(thisframe) \ | |
951 | ((thisframe)->pc >= LOWEST_PC ? \ | |
952 | read_memory_integer ((thisframe)->frame - 12, 4) :\ | |
953 | 0) | |
954 | */ | |
c5aa993b JM |
955 | /* *INDENT-ON* */ |
956 | ||
c906108c | 957 | CORE_ADDR |
ed9a39eb | 958 | arm_frame_chain (struct frame_info *fi) |
c906108c | 959 | { |
c5aa993b | 960 | #if 0 /* FIXME: enable this code if we convert to new call dummy scheme. */ |
c906108c SS |
961 | CORE_ADDR fn_start, callers_pc, fp; |
962 | ||
963 | /* is this a dummy frame? */ | |
964 | if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) | |
c5aa993b | 965 | return fi->frame; /* dummy frame same as caller's frame */ |
c906108c SS |
966 | |
967 | /* is caller-of-this a dummy frame? */ | |
c5aa993b | 968 | callers_pc = FRAME_SAVED_PC (fi); /* find out who called us: */ |
c906108c | 969 | fp = arm_find_callers_reg (fi, FP_REGNUM); |
c5aa993b JM |
970 | if (PC_IN_CALL_DUMMY (callers_pc, fp, fp)) |
971 | return fp; /* dummy frame's frame may bear no relation to ours */ | |
c906108c SS |
972 | |
973 | if (find_pc_partial_function (fi->pc, 0, &fn_start, 0)) | |
974 | if (fn_start == entry_point_address ()) | |
c5aa993b | 975 | return 0; /* in _start fn, don't chain further */ |
c906108c SS |
976 | #endif |
977 | CORE_ADDR caller_pc, fn_start; | |
978 | struct frame_info caller_fi; | |
979 | int framereg = fi->framereg; | |
980 | ||
981 | if (fi->pc < LOWEST_PC) | |
982 | return 0; | |
983 | ||
984 | /* If the caller is the startup code, we're at the end of the chain. */ | |
985 | caller_pc = FRAME_SAVED_PC (fi); | |
986 | if (find_pc_partial_function (caller_pc, 0, &fn_start, 0)) | |
987 | if (fn_start == entry_point_address ()) | |
988 | return 0; | |
989 | ||
990 | /* If the caller is Thumb and the caller is ARM, or vice versa, | |
991 | the frame register of the caller is different from ours. | |
992 | So we must scan the prologue of the caller to determine its | |
993 | frame register number. */ | |
994 | if (arm_pc_is_thumb (caller_pc) != arm_pc_is_thumb (fi->pc)) | |
995 | { | |
c5aa993b | 996 | memset (&caller_fi, 0, sizeof (caller_fi)); |
c906108c | 997 | caller_fi.pc = caller_pc; |
c5aa993b | 998 | arm_scan_prologue (&caller_fi); |
c906108c SS |
999 | framereg = caller_fi.framereg; |
1000 | } | |
1001 | ||
1002 | /* If the caller used a frame register, return its value. | |
1003 | Otherwise, return the caller's stack pointer. */ | |
1004 | if (framereg == FP_REGNUM || framereg == THUMB_FP_REGNUM) | |
1005 | return arm_find_callers_reg (fi, framereg); | |
1006 | else | |
1007 | return fi->frame + fi->framesize; | |
1008 | } | |
1009 | ||
ed9a39eb JM |
1010 | /* This function actually figures out the frame address for a given pc |
1011 | and sp. This is tricky because we sometimes don't use an explicit | |
1012 | frame pointer, and the previous stack pointer isn't necessarily | |
1013 | recorded on the stack. The only reliable way to get this info is | |
1014 | to examine the prologue. FROMLEAF is a little confusing, it means | |
1015 | this is the next frame up the chain AFTER a frameless function. If | |
1016 | this is true, then the frame value for this frame is still in the | |
1017 | fp register. */ | |
c906108c SS |
1018 | |
1019 | void | |
ed9a39eb | 1020 | arm_init_extra_frame_info (int fromleaf, struct frame_info *fi) |
c906108c SS |
1021 | { |
1022 | int reg; | |
f079148d | 1023 | CORE_ADDR sp; |
c906108c SS |
1024 | |
1025 | if (fi->next) | |
1026 | fi->pc = FRAME_SAVED_PC (fi->next); | |
1027 | ||
1028 | memset (fi->fsr.regs, '\000', sizeof fi->fsr.regs); | |
1029 | ||
c5aa993b | 1030 | #if 0 /* FIXME: enable this code if we convert to new call dummy scheme. */ |
c906108c SS |
1031 | if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) |
1032 | { | |
1033 | /* We need to setup fi->frame here because run_stack_dummy gets it wrong | |
c5aa993b JM |
1034 | by assuming it's always FP. */ |
1035 | fi->frame = generic_read_register_dummy (fi->pc, fi->frame, SP_REGNUM); | |
1036 | fi->framesize = 0; | |
c906108c SS |
1037 | fi->frameoffset = 0; |
1038 | return; | |
1039 | } | |
c5aa993b | 1040 | else |
c906108c | 1041 | #endif |
2a451106 | 1042 | |
f079148d KB |
1043 | /* Compute stack pointer for this frame. We use this value for both the |
1044 | sigtramp and call dummy cases. */ | |
1045 | if (!fi->next) | |
1046 | sp = read_sp(); | |
1047 | else | |
1048 | sp = fi->next->frame - fi->next->frameoffset + fi->next->framesize; | |
1049 | ||
2a451106 KB |
1050 | /* Determine whether or not we're in a sigtramp frame. |
1051 | Unfortunately, it isn't sufficient to test | |
1052 | fi->signal_handler_caller because this value is sometimes set | |
1053 | after invoking INIT_EXTRA_FRAME_INFO. So we test *both* | |
1054 | fi->signal_handler_caller and IN_SIGTRAMP to determine if we need | |
1055 | to use the sigcontext addresses for the saved registers. | |
1056 | ||
1057 | Note: If an ARM IN_SIGTRAMP method ever needs to compare against | |
1058 | the name of the function, the code below will have to be changed | |
1059 | to first fetch the name of the function and then pass this name | |
f079148d | 1060 | to IN_SIGTRAMP. */ |
2a451106 | 1061 | |
3bb04bdd | 1062 | if (SIGCONTEXT_REGISTER_ADDRESS_P () |
2a451106 KB |
1063 | && (fi->signal_handler_caller || IN_SIGTRAMP (fi->pc, 0))) |
1064 | { | |
2a451106 KB |
1065 | for (reg = 0; reg < NUM_REGS; reg++) |
1066 | fi->fsr.regs[reg] = SIGCONTEXT_REGISTER_ADDRESS (sp, fi->pc, reg); | |
1067 | ||
1068 | /* FIXME: What about thumb mode? */ | |
1069 | fi->framereg = SP_REGNUM; | |
f079148d KB |
1070 | fi->frame = read_memory_integer (fi->fsr.regs[fi->framereg], |
1071 | REGISTER_RAW_SIZE (fi->framereg)); | |
2a451106 KB |
1072 | fi->framesize = 0; |
1073 | fi->frameoffset = 0; | |
1074 | ||
1075 | } | |
f079148d KB |
1076 | else if (PC_IN_CALL_DUMMY (fi->pc, sp, fi->frame)) |
1077 | { | |
1078 | CORE_ADDR rp; | |
1079 | CORE_ADDR callers_sp; | |
1080 | ||
1081 | /* Set rp point at the high end of the saved registers. */ | |
1082 | rp = fi->frame - REGISTER_SIZE; | |
1083 | ||
1084 | /* Fill in addresses of saved registers. */ | |
1085 | fi->fsr.regs[PS_REGNUM] = rp; | |
1086 | rp -= REGISTER_RAW_SIZE (PS_REGNUM); | |
1087 | for (reg = PC_REGNUM; reg >= 0; reg--) | |
1088 | { | |
1089 | fi->fsr.regs[reg] = rp; | |
1090 | rp -= REGISTER_RAW_SIZE (reg); | |
1091 | } | |
1092 | ||
1093 | callers_sp = read_memory_integer (fi->fsr.regs[SP_REGNUM], | |
1094 | REGISTER_RAW_SIZE (SP_REGNUM)); | |
1095 | fi->framereg = FP_REGNUM; | |
1096 | fi->framesize = callers_sp - sp; | |
1097 | fi->frameoffset = fi->frame - sp; | |
1098 | } | |
2a451106 | 1099 | else |
c906108c SS |
1100 | { |
1101 | arm_scan_prologue (fi); | |
1102 | ||
104c1213 JM |
1103 | if (!fi->next) |
1104 | /* this is the innermost frame? */ | |
c906108c | 1105 | fi->frame = read_register (fi->framereg); |
ed9a39eb JM |
1106 | else if (fi->framereg == FP_REGNUM || fi->framereg == THUMB_FP_REGNUM) |
1107 | { | |
1108 | /* not the innermost frame */ | |
1109 | /* If we have an FP, the callee saved it. */ | |
1110 | if (fi->next->fsr.regs[fi->framereg] != 0) | |
1111 | fi->frame = | |
1112 | read_memory_integer (fi->next->fsr.regs[fi->framereg], 4); | |
1113 | else if (fromleaf) | |
1114 | /* If we were called by a frameless fn. then our frame is | |
1115 | still in the frame pointer register on the board... */ | |
1116 | fi->frame = read_fp (); | |
1117 | } | |
c906108c | 1118 | |
ed9a39eb JM |
1119 | /* Calculate actual addresses of saved registers using offsets |
1120 | determined by arm_scan_prologue. */ | |
c906108c SS |
1121 | for (reg = 0; reg < NUM_REGS; reg++) |
1122 | if (fi->fsr.regs[reg] != 0) | |
1123 | fi->fsr.regs[reg] += fi->frame + fi->framesize - fi->frameoffset; | |
1124 | } | |
1125 | } | |
1126 | ||
1127 | ||
ed9a39eb JM |
1128 | /* Find the caller of this frame. We do this by seeing if LR_REGNUM |
1129 | is saved in the stack anywhere, otherwise we get it from the | |
1130 | registers. | |
c906108c SS |
1131 | |
1132 | The old definition of this function was a macro: | |
c5aa993b | 1133 | #define FRAME_SAVED_PC(FRAME) \ |
ed9a39eb | 1134 | ADDR_BITS_REMOVE (read_memory_integer ((FRAME)->frame - 4, 4)) */ |
c906108c SS |
1135 | |
1136 | CORE_ADDR | |
ed9a39eb | 1137 | arm_frame_saved_pc (struct frame_info *fi) |
c906108c | 1138 | { |
c5aa993b | 1139 | #if 0 /* FIXME: enable this code if we convert to new call dummy scheme. */ |
c906108c SS |
1140 | if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) |
1141 | return generic_read_register_dummy (fi->pc, fi->frame, PC_REGNUM); | |
1142 | else | |
1143 | #endif | |
f079148d KB |
1144 | if (PC_IN_CALL_DUMMY (fi->pc, fi->frame - fi->frameoffset, fi->frame)) |
1145 | { | |
1146 | return read_memory_integer (fi->fsr.regs[PC_REGNUM], REGISTER_RAW_SIZE (PC_REGNUM)); | |
1147 | } | |
1148 | else | |
c906108c SS |
1149 | { |
1150 | CORE_ADDR pc = arm_find_callers_reg (fi, LR_REGNUM); | |
1151 | return IS_THUMB_ADDR (pc) ? UNMAKE_THUMB_ADDR (pc) : pc; | |
1152 | } | |
1153 | } | |
1154 | ||
c906108c SS |
1155 | /* Return the frame address. On ARM, it is R11; on Thumb it is R7. |
1156 | Examine the Program Status Register to decide which state we're in. */ | |
1157 | ||
1158 | CORE_ADDR | |
ed9a39eb | 1159 | arm_target_read_fp (void) |
c906108c SS |
1160 | { |
1161 | if (read_register (PS_REGNUM) & 0x20) /* Bit 5 is Thumb state bit */ | |
1162 | return read_register (THUMB_FP_REGNUM); /* R7 if Thumb */ | |
1163 | else | |
c5aa993b | 1164 | return read_register (FP_REGNUM); /* R11 if ARM */ |
c906108c SS |
1165 | } |
1166 | ||
ed9a39eb | 1167 | /* Calculate the frame offsets of the saved registers (ARM version). */ |
c906108c | 1168 | |
c906108c | 1169 | void |
ed9a39eb JM |
1170 | arm_frame_find_saved_regs (struct frame_info *fi, |
1171 | struct frame_saved_regs *regaddr) | |
c906108c SS |
1172 | { |
1173 | memcpy (regaddr, &fi->fsr, sizeof (struct frame_saved_regs)); | |
1174 | } | |
1175 | ||
c906108c | 1176 | void |
ed9a39eb | 1177 | arm_push_dummy_frame (void) |
c906108c SS |
1178 | { |
1179 | CORE_ADDR old_sp = read_register (SP_REGNUM); | |
1180 | CORE_ADDR sp = old_sp; | |
1181 | CORE_ADDR fp, prologue_start; | |
1182 | int regnum; | |
1183 | ||
1184 | /* Push the two dummy prologue instructions in reverse order, | |
1185 | so that they'll be in the correct low-to-high order in memory. */ | |
1186 | /* sub fp, ip, #4 */ | |
1187 | sp = push_word (sp, 0xe24cb004); | |
1188 | /* stmdb sp!, {r0-r10, fp, ip, lr, pc} */ | |
1189 | prologue_start = sp = push_word (sp, 0xe92ddfff); | |
1190 | ||
ed9a39eb JM |
1191 | /* Push a pointer to the dummy prologue + 12, because when stm |
1192 | instruction stores the PC, it stores the address of the stm | |
c906108c SS |
1193 | instruction itself plus 12. */ |
1194 | fp = sp = push_word (sp, prologue_start + 12); | |
c5aa993b | 1195 | |
f079148d KB |
1196 | /* Push the processor status. */ |
1197 | sp = push_word (sp, read_register (PS_REGNUM)); | |
1198 | ||
1199 | /* Push all 16 registers starting with r15. */ | |
1200 | for (regnum = PC_REGNUM; regnum >= 0; regnum--) | |
c906108c | 1201 | sp = push_word (sp, read_register (regnum)); |
c5aa993b | 1202 | |
f079148d | 1203 | /* Update fp (for both Thumb and ARM) and sp. */ |
c906108c SS |
1204 | write_register (FP_REGNUM, fp); |
1205 | write_register (THUMB_FP_REGNUM, fp); | |
1206 | write_register (SP_REGNUM, sp); | |
1207 | } | |
1208 | ||
1209 | /* Fix up the call dummy, based on whether the processor is currently | |
ed9a39eb JM |
1210 | in Thumb or ARM mode, and whether the target function is Thumb or |
1211 | ARM. There are three different situations requiring three | |
c906108c SS |
1212 | different dummies: |
1213 | ||
1214 | * ARM calling ARM: uses the call dummy in tm-arm.h, which has already | |
c5aa993b | 1215 | been copied into the dummy parameter to this function. |
c906108c | 1216 | * ARM calling Thumb: uses the call dummy in tm-arm.h, but with the |
c5aa993b | 1217 | "mov pc,r4" instruction patched to be a "bx r4" instead. |
c906108c | 1218 | * Thumb calling anything: uses the Thumb dummy defined below, which |
c5aa993b | 1219 | works for calling both ARM and Thumb functions. |
c906108c | 1220 | |
ed9a39eb JM |
1221 | All three call dummies expect to receive the target function |
1222 | address in R4, with the low bit set if it's a Thumb function. */ | |
c906108c SS |
1223 | |
1224 | void | |
ed9a39eb | 1225 | arm_fix_call_dummy (char *dummy, CORE_ADDR pc, CORE_ADDR fun, int nargs, |
ea7c478f | 1226 | struct value **args, struct type *type, int gcc_p) |
c906108c SS |
1227 | { |
1228 | static short thumb_dummy[4] = | |
1229 | { | |
c5aa993b JM |
1230 | 0xf000, 0xf801, /* bl label */ |
1231 | 0xdf18, /* swi 24 */ | |
1232 | 0x4720, /* label: bx r4 */ | |
c906108c SS |
1233 | }; |
1234 | static unsigned long arm_bx_r4 = 0xe12fff14; /* bx r4 instruction */ | |
1235 | ||
1236 | /* Set flag indicating whether the current PC is in a Thumb function. */ | |
c5aa993b | 1237 | caller_is_thumb = arm_pc_is_thumb (read_pc ()); |
c906108c | 1238 | |
ed9a39eb JM |
1239 | /* If the target function is Thumb, set the low bit of the function |
1240 | address. And if the CPU is currently in ARM mode, patch the | |
1241 | second instruction of call dummy to use a BX instruction to | |
1242 | switch to Thumb mode. */ | |
c906108c SS |
1243 | target_is_thumb = arm_pc_is_thumb (fun); |
1244 | if (target_is_thumb) | |
1245 | { | |
1246 | fun |= 1; | |
1247 | if (!caller_is_thumb) | |
1248 | store_unsigned_integer (dummy + 4, sizeof (arm_bx_r4), arm_bx_r4); | |
1249 | } | |
1250 | ||
1251 | /* If the CPU is currently in Thumb mode, use the Thumb call dummy | |
1252 | instead of the ARM one that's already been copied. This will | |
1253 | work for both Thumb and ARM target functions. */ | |
1254 | if (caller_is_thumb) | |
1255 | { | |
1256 | int i; | |
1257 | char *p = dummy; | |
1258 | int len = sizeof (thumb_dummy) / sizeof (thumb_dummy[0]); | |
1259 | ||
1260 | for (i = 0; i < len; i++) | |
1261 | { | |
1262 | store_unsigned_integer (p, sizeof (thumb_dummy[0]), thumb_dummy[i]); | |
1263 | p += sizeof (thumb_dummy[0]); | |
1264 | } | |
1265 | } | |
1266 | ||
ed9a39eb JM |
1267 | /* Put the target address in r4; the call dummy will copy this to |
1268 | the PC. */ | |
c906108c SS |
1269 | write_register (4, fun); |
1270 | } | |
1271 | ||
c906108c | 1272 | /* Return the offset in the call dummy of the instruction that needs |
ed9a39eb JM |
1273 | to have a breakpoint placed on it. This is the offset of the 'swi |
1274 | 24' instruction, which is no longer actually used, but simply acts | |
c906108c SS |
1275 | as a place-holder now. |
1276 | ||
ed9a39eb | 1277 | This implements the CALL_DUMMY_BREAK_OFFSET macro. */ |
c906108c SS |
1278 | |
1279 | int | |
ed9a39eb | 1280 | arm_call_dummy_breakpoint_offset (void) |
c906108c SS |
1281 | { |
1282 | if (caller_is_thumb) | |
1283 | return 4; | |
1284 | else | |
1285 | return 8; | |
1286 | } | |
1287 | ||
ed9a39eb JM |
1288 | /* Note: ScottB |
1289 | ||
1290 | This function does not support passing parameters using the FPA | |
1291 | variant of the APCS. It passes any floating point arguments in the | |
1292 | general registers and/or on the stack. */ | |
c906108c SS |
1293 | |
1294 | CORE_ADDR | |
ea7c478f | 1295 | arm_push_arguments (int nargs, struct value **args, CORE_ADDR sp, |
ed9a39eb | 1296 | int struct_return, CORE_ADDR struct_addr) |
c906108c | 1297 | { |
ed9a39eb JM |
1298 | char *fp; |
1299 | int argnum, argreg, nstack_size; | |
1300 | ||
1301 | /* Walk through the list of args and determine how large a temporary | |
1302 | stack is required. Need to take care here as structs may be | |
1303 | passed on the stack, and we have to to push them. */ | |
1304 | nstack_size = -4 * REGISTER_SIZE; /* Some arguments go into A1-A4. */ | |
1305 | if (struct_return) /* The struct address goes in A1. */ | |
1306 | nstack_size += REGISTER_SIZE; | |
1307 | ||
1308 | /* Walk through the arguments and add their size to nstack_size. */ | |
1309 | for (argnum = 0; argnum < nargs; argnum++) | |
c5aa993b | 1310 | { |
c906108c | 1311 | int len; |
ed9a39eb JM |
1312 | struct type *arg_type; |
1313 | ||
1314 | arg_type = check_typedef (VALUE_TYPE (args[argnum])); | |
1315 | len = TYPE_LENGTH (arg_type); | |
c906108c | 1316 | |
ed9a39eb JM |
1317 | /* ANSI C code passes float arguments as integers, K&R code |
1318 | passes float arguments as doubles. Correct for this here. */ | |
1319 | if (TYPE_CODE_FLT == TYPE_CODE (arg_type) && REGISTER_SIZE == len) | |
1320 | nstack_size += FP_REGISTER_VIRTUAL_SIZE; | |
1321 | else | |
1322 | nstack_size += len; | |
1323 | } | |
c906108c | 1324 | |
ed9a39eb JM |
1325 | /* Allocate room on the stack, and initialize our stack frame |
1326 | pointer. */ | |
1327 | fp = NULL; | |
1328 | if (nstack_size > 0) | |
1329 | { | |
1330 | sp -= nstack_size; | |
1331 | fp = (char *) sp; | |
1332 | } | |
1333 | ||
1334 | /* Initialize the integer argument register pointer. */ | |
c906108c | 1335 | argreg = A1_REGNUM; |
c906108c | 1336 | |
ed9a39eb JM |
1337 | /* The struct_return pointer occupies the first parameter passing |
1338 | register. */ | |
c906108c | 1339 | if (struct_return) |
c5aa993b | 1340 | write_register (argreg++, struct_addr); |
c906108c | 1341 | |
ed9a39eb JM |
1342 | /* Process arguments from left to right. Store as many as allowed |
1343 | in the parameter passing registers (A1-A4), and save the rest on | |
1344 | the temporary stack. */ | |
c5aa993b | 1345 | for (argnum = 0; argnum < nargs; argnum++) |
c906108c | 1346 | { |
ed9a39eb | 1347 | int len; |
c5aa993b | 1348 | char *val; |
c5aa993b | 1349 | CORE_ADDR regval; |
ed9a39eb JM |
1350 | enum type_code typecode; |
1351 | struct type *arg_type, *target_type; | |
1352 | ||
1353 | arg_type = check_typedef (VALUE_TYPE (args[argnum])); | |
1354 | target_type = TYPE_TARGET_TYPE (arg_type); | |
1355 | len = TYPE_LENGTH (arg_type); | |
1356 | typecode = TYPE_CODE (arg_type); | |
1357 | val = (char *) VALUE_CONTENTS (args[argnum]); | |
1358 | ||
1359 | /* ANSI C code passes float arguments as integers, K&R code | |
1360 | passes float arguments as doubles. The .stabs record for | |
1361 | for ANSI prototype floating point arguments records the | |
1362 | type as FP_INTEGER, while a K&R style (no prototype) | |
1363 | .stabs records the type as FP_FLOAT. In this latter case | |
1364 | the compiler converts the float arguments to double before | |
1365 | calling the function. */ | |
1366 | if (TYPE_CODE_FLT == typecode && REGISTER_SIZE == len) | |
1367 | { | |
a37b3cc0 AC |
1368 | DOUBLEST dblval; |
1369 | dblval = extract_floating (val, len); | |
1370 | len = TARGET_DOUBLE_BIT / TARGET_CHAR_BIT; | |
1371 | val = alloca (len); | |
1372 | store_floating (val, len, dblval); | |
ed9a39eb | 1373 | } |
da59e081 JM |
1374 | #if 1 |
1375 | /* I don't know why this code was disable. The only logical use | |
1376 | for a function pointer is to call that function, so setting | |
1377 | the mode bit is perfectly fine. FN */ | |
ed9a39eb | 1378 | /* If the argument is a pointer to a function, and it is a Thumb |
c906108c | 1379 | function, set the low bit of the pointer. */ |
ed9a39eb JM |
1380 | if (TYPE_CODE_PTR == typecode |
1381 | && NULL != target_type | |
1382 | && TYPE_CODE_FUNC == TYPE_CODE (target_type)) | |
c906108c | 1383 | { |
ed9a39eb | 1384 | CORE_ADDR regval = extract_address (val, len); |
c906108c SS |
1385 | if (arm_pc_is_thumb (regval)) |
1386 | store_address (val, len, MAKE_THUMB_ADDR (regval)); | |
1387 | } | |
c906108c | 1388 | #endif |
ed9a39eb JM |
1389 | /* Copy the argument to general registers or the stack in |
1390 | register-sized pieces. Large arguments are split between | |
1391 | registers and stack. */ | |
1392 | while (len > 0) | |
c906108c | 1393 | { |
ed9a39eb JM |
1394 | int partial_len = len < REGISTER_SIZE ? len : REGISTER_SIZE; |
1395 | ||
1396 | if (argreg <= ARM_LAST_ARG_REGNUM) | |
c906108c | 1397 | { |
ed9a39eb JM |
1398 | /* It's an argument being passed in a general register. */ |
1399 | regval = extract_address (val, partial_len); | |
1400 | write_register (argreg++, regval); | |
c906108c | 1401 | } |
ed9a39eb JM |
1402 | else |
1403 | { | |
1404 | /* Push the arguments onto the stack. */ | |
1405 | write_memory ((CORE_ADDR) fp, val, REGISTER_SIZE); | |
1406 | fp += REGISTER_SIZE; | |
1407 | } | |
1408 | ||
1409 | len -= partial_len; | |
1410 | val += partial_len; | |
c906108c SS |
1411 | } |
1412 | } | |
c906108c SS |
1413 | |
1414 | /* Return adjusted stack pointer. */ | |
1415 | return sp; | |
1416 | } | |
1417 | ||
f079148d KB |
1418 | /* Pop the current frame. So long as the frame info has been initialized |
1419 | properly (see arm_init_extra_frame_info), this code works for dummy frames | |
1420 | as well as regular frames. I.e, there's no need to have a special case | |
1421 | for dummy frames. */ | |
c906108c | 1422 | void |
ed9a39eb | 1423 | arm_pop_frame (void) |
c906108c | 1424 | { |
c906108c | 1425 | int regnum; |
8b93c638 | 1426 | struct frame_info *frame = get_current_frame (); |
f079148d | 1427 | CORE_ADDR old_SP = frame->frame - frame->frameoffset + frame->framesize; |
c906108c | 1428 | |
f079148d KB |
1429 | for (regnum = 0; regnum < NUM_REGS; regnum++) |
1430 | if (frame->fsr.regs[regnum] != 0) | |
1431 | write_register (regnum, | |
1432 | read_memory_integer (frame->fsr.regs[regnum], | |
1433 | REGISTER_RAW_SIZE (regnum))); | |
8b93c638 | 1434 | |
f079148d KB |
1435 | write_register (PC_REGNUM, FRAME_SAVED_PC (frame)); |
1436 | write_register (SP_REGNUM, old_SP); | |
c906108c SS |
1437 | |
1438 | flush_cached_frames (); | |
1439 | } | |
1440 | ||
1441 | static void | |
ed9a39eb | 1442 | print_fpu_flags (int flags) |
c906108c | 1443 | { |
c5aa993b JM |
1444 | if (flags & (1 << 0)) |
1445 | fputs ("IVO ", stdout); | |
1446 | if (flags & (1 << 1)) | |
1447 | fputs ("DVZ ", stdout); | |
1448 | if (flags & (1 << 2)) | |
1449 | fputs ("OFL ", stdout); | |
1450 | if (flags & (1 << 3)) | |
1451 | fputs ("UFL ", stdout); | |
1452 | if (flags & (1 << 4)) | |
1453 | fputs ("INX ", stdout); | |
1454 | putchar ('\n'); | |
c906108c SS |
1455 | } |
1456 | ||
1457 | void | |
ed9a39eb | 1458 | arm_float_info (void) |
c906108c | 1459 | { |
c5aa993b JM |
1460 | register unsigned long status = read_register (FPS_REGNUM); |
1461 | int type; | |
1462 | ||
1463 | type = (status >> 24) & 127; | |
1464 | printf ("%s FPU type %d\n", | |
ed9a39eb | 1465 | (status & (1 << 31)) ? "Hardware" : "Software", |
c5aa993b JM |
1466 | type); |
1467 | fputs ("mask: ", stdout); | |
1468 | print_fpu_flags (status >> 16); | |
1469 | fputs ("flags: ", stdout); | |
1470 | print_fpu_flags (status); | |
c906108c SS |
1471 | } |
1472 | ||
032758dc AC |
1473 | struct type * |
1474 | arm_register_type (int regnum) | |
1475 | { | |
1476 | if (regnum >= F0_REGNUM && regnum < F0_REGNUM + NUM_FREGS) | |
1477 | { | |
1478 | if (TARGET_BYTE_ORDER == BIG_ENDIAN) | |
1479 | return builtin_type_arm_ext_big; | |
1480 | else | |
1481 | return builtin_type_arm_ext_littlebyte_bigword; | |
1482 | } | |
1483 | else | |
1484 | return builtin_type_int32; | |
1485 | } | |
1486 | ||
a37b3cc0 AC |
1487 | /* NOTE: cagney/2001-08-20: Both convert_from_extended() and |
1488 | convert_to_extended() use floatformat_arm_ext_littlebyte_bigword. | |
1489 | It is thought that this is is the floating-point register format on | |
1490 | little-endian systems. */ | |
c906108c | 1491 | |
ed9a39eb JM |
1492 | static void |
1493 | convert_from_extended (void *ptr, void *dbl) | |
c906108c | 1494 | { |
a37b3cc0 AC |
1495 | DOUBLEST d; |
1496 | if (TARGET_BYTE_ORDER == BIG_ENDIAN) | |
1497 | floatformat_to_doublest (&floatformat_arm_ext_big, ptr, &d); | |
1498 | else | |
1499 | floatformat_to_doublest (&floatformat_arm_ext_littlebyte_bigword, | |
1500 | ptr, &d); | |
1501 | floatformat_from_doublest (TARGET_DOUBLE_FORMAT, &d, dbl); | |
c906108c SS |
1502 | } |
1503 | ||
c5aa993b | 1504 | void |
ed9a39eb | 1505 | convert_to_extended (void *dbl, void *ptr) |
c906108c | 1506 | { |
a37b3cc0 AC |
1507 | DOUBLEST d; |
1508 | floatformat_to_doublest (TARGET_DOUBLE_FORMAT, ptr, &d); | |
1509 | if (TARGET_BYTE_ORDER == BIG_ENDIAN) | |
1510 | floatformat_from_doublest (&floatformat_arm_ext_big, &d, dbl); | |
1511 | else | |
1512 | floatformat_from_doublest (&floatformat_arm_ext_littlebyte_bigword, | |
1513 | &d, dbl); | |
c906108c | 1514 | } |
ed9a39eb | 1515 | |
c906108c | 1516 | static int |
ed9a39eb | 1517 | condition_true (unsigned long cond, unsigned long status_reg) |
c906108c SS |
1518 | { |
1519 | if (cond == INST_AL || cond == INST_NV) | |
1520 | return 1; | |
1521 | ||
1522 | switch (cond) | |
1523 | { | |
1524 | case INST_EQ: | |
1525 | return ((status_reg & FLAG_Z) != 0); | |
1526 | case INST_NE: | |
1527 | return ((status_reg & FLAG_Z) == 0); | |
1528 | case INST_CS: | |
1529 | return ((status_reg & FLAG_C) != 0); | |
1530 | case INST_CC: | |
1531 | return ((status_reg & FLAG_C) == 0); | |
1532 | case INST_MI: | |
1533 | return ((status_reg & FLAG_N) != 0); | |
1534 | case INST_PL: | |
1535 | return ((status_reg & FLAG_N) == 0); | |
1536 | case INST_VS: | |
1537 | return ((status_reg & FLAG_V) != 0); | |
1538 | case INST_VC: | |
1539 | return ((status_reg & FLAG_V) == 0); | |
1540 | case INST_HI: | |
1541 | return ((status_reg & (FLAG_C | FLAG_Z)) == FLAG_C); | |
1542 | case INST_LS: | |
1543 | return ((status_reg & (FLAG_C | FLAG_Z)) != FLAG_C); | |
1544 | case INST_GE: | |
1545 | return (((status_reg & FLAG_N) == 0) == ((status_reg & FLAG_V) == 0)); | |
1546 | case INST_LT: | |
1547 | return (((status_reg & FLAG_N) == 0) != ((status_reg & FLAG_V) == 0)); | |
1548 | case INST_GT: | |
1549 | return (((status_reg & FLAG_Z) == 0) && | |
ed9a39eb | 1550 | (((status_reg & FLAG_N) == 0) == ((status_reg & FLAG_V) == 0))); |
c906108c SS |
1551 | case INST_LE: |
1552 | return (((status_reg & FLAG_Z) != 0) || | |
ed9a39eb | 1553 | (((status_reg & FLAG_N) == 0) != ((status_reg & FLAG_V) == 0))); |
c906108c SS |
1554 | } |
1555 | return 1; | |
1556 | } | |
1557 | ||
9512d7fd | 1558 | /* Support routines for single stepping. Calculate the next PC value. */ |
c906108c SS |
1559 | #define submask(x) ((1L << ((x) + 1)) - 1) |
1560 | #define bit(obj,st) (((obj) >> (st)) & 1) | |
1561 | #define bits(obj,st,fn) (((obj) >> (st)) & submask ((fn) - (st))) | |
1562 | #define sbits(obj,st,fn) \ | |
1563 | ((long) (bits(obj,st,fn) | ((long) bit(obj,fn) * ~ submask (fn - st)))) | |
1564 | #define BranchDest(addr,instr) \ | |
1565 | ((CORE_ADDR) (((long) (addr)) + 8 + (sbits (instr, 0, 23) << 2))) | |
1566 | #define ARM_PC_32 1 | |
1567 | ||
1568 | static unsigned long | |
ed9a39eb JM |
1569 | shifted_reg_val (unsigned long inst, int carry, unsigned long pc_val, |
1570 | unsigned long status_reg) | |
c906108c SS |
1571 | { |
1572 | unsigned long res, shift; | |
1573 | int rm = bits (inst, 0, 3); | |
1574 | unsigned long shifttype = bits (inst, 5, 6); | |
c5aa993b JM |
1575 | |
1576 | if (bit (inst, 4)) | |
c906108c SS |
1577 | { |
1578 | int rs = bits (inst, 8, 11); | |
1579 | shift = (rs == 15 ? pc_val + 8 : read_register (rs)) & 0xFF; | |
1580 | } | |
1581 | else | |
1582 | shift = bits (inst, 7, 11); | |
c5aa993b JM |
1583 | |
1584 | res = (rm == 15 | |
c906108c | 1585 | ? ((pc_val | (ARM_PC_32 ? 0 : status_reg)) |
c5aa993b | 1586 | + (bit (inst, 4) ? 12 : 8)) |
c906108c SS |
1587 | : read_register (rm)); |
1588 | ||
1589 | switch (shifttype) | |
1590 | { | |
c5aa993b | 1591 | case 0: /* LSL */ |
c906108c SS |
1592 | res = shift >= 32 ? 0 : res << shift; |
1593 | break; | |
c5aa993b JM |
1594 | |
1595 | case 1: /* LSR */ | |
c906108c SS |
1596 | res = shift >= 32 ? 0 : res >> shift; |
1597 | break; | |
1598 | ||
c5aa993b JM |
1599 | case 2: /* ASR */ |
1600 | if (shift >= 32) | |
1601 | shift = 31; | |
c906108c SS |
1602 | res = ((res & 0x80000000L) |
1603 | ? ~((~res) >> shift) : res >> shift); | |
1604 | break; | |
1605 | ||
c5aa993b | 1606 | case 3: /* ROR/RRX */ |
c906108c SS |
1607 | shift &= 31; |
1608 | if (shift == 0) | |
1609 | res = (res >> 1) | (carry ? 0x80000000L : 0); | |
1610 | else | |
c5aa993b | 1611 | res = (res >> shift) | (res << (32 - shift)); |
c906108c SS |
1612 | break; |
1613 | } | |
1614 | ||
1615 | return res & 0xffffffff; | |
1616 | } | |
1617 | ||
c906108c SS |
1618 | /* Return number of 1-bits in VAL. */ |
1619 | ||
1620 | static int | |
ed9a39eb | 1621 | bitcount (unsigned long val) |
c906108c SS |
1622 | { |
1623 | int nbits; | |
1624 | for (nbits = 0; val != 0; nbits++) | |
c5aa993b | 1625 | val &= val - 1; /* delete rightmost 1-bit in val */ |
c906108c SS |
1626 | return nbits; |
1627 | } | |
1628 | ||
c906108c | 1629 | static CORE_ADDR |
ed9a39eb | 1630 | thumb_get_next_pc (CORE_ADDR pc) |
c906108c | 1631 | { |
c5aa993b | 1632 | unsigned long pc_val = ((unsigned long) pc) + 4; /* PC after prefetch */ |
c906108c | 1633 | unsigned short inst1 = read_memory_integer (pc, 2); |
c5aa993b | 1634 | CORE_ADDR nextpc = pc + 2; /* default is next instruction */ |
c906108c SS |
1635 | unsigned long offset; |
1636 | ||
1637 | if ((inst1 & 0xff00) == 0xbd00) /* pop {rlist, pc} */ | |
1638 | { | |
1639 | CORE_ADDR sp; | |
1640 | ||
1641 | /* Fetch the saved PC from the stack. It's stored above | |
1642 | all of the other registers. */ | |
1643 | offset = bitcount (bits (inst1, 0, 7)) * REGISTER_SIZE; | |
1644 | sp = read_register (SP_REGNUM); | |
1645 | nextpc = (CORE_ADDR) read_memory_integer (sp + offset, 4); | |
1646 | nextpc = ADDR_BITS_REMOVE (nextpc); | |
1647 | if (nextpc == pc) | |
1648 | error ("Infinite loop detected"); | |
1649 | } | |
1650 | else if ((inst1 & 0xf000) == 0xd000) /* conditional branch */ | |
1651 | { | |
1652 | unsigned long status = read_register (PS_REGNUM); | |
c5aa993b | 1653 | unsigned long cond = bits (inst1, 8, 11); |
c906108c SS |
1654 | if (cond != 0x0f && condition_true (cond, status)) /* 0x0f = SWI */ |
1655 | nextpc = pc_val + (sbits (inst1, 0, 7) << 1); | |
1656 | } | |
1657 | else if ((inst1 & 0xf800) == 0xe000) /* unconditional branch */ | |
1658 | { | |
1659 | nextpc = pc_val + (sbits (inst1, 0, 10) << 1); | |
1660 | } | |
1661 | else if ((inst1 & 0xf800) == 0xf000) /* long branch with link */ | |
1662 | { | |
1663 | unsigned short inst2 = read_memory_integer (pc + 2, 2); | |
c5aa993b | 1664 | offset = (sbits (inst1, 0, 10) << 12) + (bits (inst2, 0, 10) << 1); |
c906108c SS |
1665 | nextpc = pc_val + offset; |
1666 | } | |
1667 | ||
1668 | return nextpc; | |
1669 | } | |
1670 | ||
c906108c | 1671 | CORE_ADDR |
ed9a39eb | 1672 | arm_get_next_pc (CORE_ADDR pc) |
c906108c SS |
1673 | { |
1674 | unsigned long pc_val; | |
1675 | unsigned long this_instr; | |
1676 | unsigned long status; | |
1677 | CORE_ADDR nextpc; | |
1678 | ||
1679 | if (arm_pc_is_thumb (pc)) | |
1680 | return thumb_get_next_pc (pc); | |
1681 | ||
1682 | pc_val = (unsigned long) pc; | |
1683 | this_instr = read_memory_integer (pc, 4); | |
1684 | status = read_register (PS_REGNUM); | |
c5aa993b | 1685 | nextpc = (CORE_ADDR) (pc_val + 4); /* Default case */ |
c906108c SS |
1686 | |
1687 | if (condition_true (bits (this_instr, 28, 31), status)) | |
1688 | { | |
1689 | switch (bits (this_instr, 24, 27)) | |
1690 | { | |
c5aa993b JM |
1691 | case 0x0: |
1692 | case 0x1: /* data processing */ | |
1693 | case 0x2: | |
1694 | case 0x3: | |
c906108c SS |
1695 | { |
1696 | unsigned long operand1, operand2, result = 0; | |
1697 | unsigned long rn; | |
1698 | int c; | |
c5aa993b | 1699 | |
c906108c SS |
1700 | if (bits (this_instr, 12, 15) != 15) |
1701 | break; | |
1702 | ||
1703 | if (bits (this_instr, 22, 25) == 0 | |
c5aa993b | 1704 | && bits (this_instr, 4, 7) == 9) /* multiply */ |
c906108c SS |
1705 | error ("Illegal update to pc in instruction"); |
1706 | ||
1707 | /* Multiply into PC */ | |
1708 | c = (status & FLAG_C) ? 1 : 0; | |
1709 | rn = bits (this_instr, 16, 19); | |
1710 | operand1 = (rn == 15) ? pc_val + 8 : read_register (rn); | |
c5aa993b | 1711 | |
c906108c SS |
1712 | if (bit (this_instr, 25)) |
1713 | { | |
1714 | unsigned long immval = bits (this_instr, 0, 7); | |
1715 | unsigned long rotate = 2 * bits (this_instr, 8, 11); | |
c5aa993b JM |
1716 | operand2 = ((immval >> rotate) | (immval << (32 - rotate))) |
1717 | & 0xffffffff; | |
c906108c | 1718 | } |
c5aa993b | 1719 | else /* operand 2 is a shifted register */ |
c906108c | 1720 | operand2 = shifted_reg_val (this_instr, c, pc_val, status); |
c5aa993b | 1721 | |
c906108c SS |
1722 | switch (bits (this_instr, 21, 24)) |
1723 | { | |
c5aa993b | 1724 | case 0x0: /*and */ |
c906108c SS |
1725 | result = operand1 & operand2; |
1726 | break; | |
1727 | ||
c5aa993b | 1728 | case 0x1: /*eor */ |
c906108c SS |
1729 | result = operand1 ^ operand2; |
1730 | break; | |
1731 | ||
c5aa993b | 1732 | case 0x2: /*sub */ |
c906108c SS |
1733 | result = operand1 - operand2; |
1734 | break; | |
1735 | ||
c5aa993b | 1736 | case 0x3: /*rsb */ |
c906108c SS |
1737 | result = operand2 - operand1; |
1738 | break; | |
1739 | ||
c5aa993b | 1740 | case 0x4: /*add */ |
c906108c SS |
1741 | result = operand1 + operand2; |
1742 | break; | |
1743 | ||
c5aa993b | 1744 | case 0x5: /*adc */ |
c906108c SS |
1745 | result = operand1 + operand2 + c; |
1746 | break; | |
1747 | ||
c5aa993b | 1748 | case 0x6: /*sbc */ |
c906108c SS |
1749 | result = operand1 - operand2 + c; |
1750 | break; | |
1751 | ||
c5aa993b | 1752 | case 0x7: /*rsc */ |
c906108c SS |
1753 | result = operand2 - operand1 + c; |
1754 | break; | |
1755 | ||
c5aa993b JM |
1756 | case 0x8: |
1757 | case 0x9: | |
1758 | case 0xa: | |
1759 | case 0xb: /* tst, teq, cmp, cmn */ | |
c906108c SS |
1760 | result = (unsigned long) nextpc; |
1761 | break; | |
1762 | ||
c5aa993b | 1763 | case 0xc: /*orr */ |
c906108c SS |
1764 | result = operand1 | operand2; |
1765 | break; | |
1766 | ||
c5aa993b | 1767 | case 0xd: /*mov */ |
c906108c SS |
1768 | /* Always step into a function. */ |
1769 | result = operand2; | |
c5aa993b | 1770 | break; |
c906108c | 1771 | |
c5aa993b | 1772 | case 0xe: /*bic */ |
c906108c SS |
1773 | result = operand1 & ~operand2; |
1774 | break; | |
1775 | ||
c5aa993b | 1776 | case 0xf: /*mvn */ |
c906108c SS |
1777 | result = ~operand2; |
1778 | break; | |
1779 | } | |
1780 | nextpc = (CORE_ADDR) ADDR_BITS_REMOVE (result); | |
1781 | ||
1782 | if (nextpc == pc) | |
1783 | error ("Infinite loop detected"); | |
1784 | break; | |
1785 | } | |
c5aa993b JM |
1786 | |
1787 | case 0x4: | |
1788 | case 0x5: /* data transfer */ | |
1789 | case 0x6: | |
1790 | case 0x7: | |
c906108c SS |
1791 | if (bit (this_instr, 20)) |
1792 | { | |
1793 | /* load */ | |
1794 | if (bits (this_instr, 12, 15) == 15) | |
1795 | { | |
1796 | /* rd == pc */ | |
c5aa993b | 1797 | unsigned long rn; |
c906108c | 1798 | unsigned long base; |
c5aa993b | 1799 | |
c906108c SS |
1800 | if (bit (this_instr, 22)) |
1801 | error ("Illegal update to pc in instruction"); | |
1802 | ||
1803 | /* byte write to PC */ | |
1804 | rn = bits (this_instr, 16, 19); | |
1805 | base = (rn == 15) ? pc_val + 8 : read_register (rn); | |
1806 | if (bit (this_instr, 24)) | |
1807 | { | |
1808 | /* pre-indexed */ | |
1809 | int c = (status & FLAG_C) ? 1 : 0; | |
1810 | unsigned long offset = | |
c5aa993b | 1811 | (bit (this_instr, 25) |
ed9a39eb | 1812 | ? shifted_reg_val (this_instr, c, pc_val, status) |
c5aa993b | 1813 | : bits (this_instr, 0, 11)); |
c906108c SS |
1814 | |
1815 | if (bit (this_instr, 23)) | |
1816 | base += offset; | |
1817 | else | |
1818 | base -= offset; | |
1819 | } | |
c5aa993b | 1820 | nextpc = (CORE_ADDR) read_memory_integer ((CORE_ADDR) base, |
c906108c | 1821 | 4); |
c5aa993b | 1822 | |
c906108c SS |
1823 | nextpc = ADDR_BITS_REMOVE (nextpc); |
1824 | ||
1825 | if (nextpc == pc) | |
1826 | error ("Infinite loop detected"); | |
1827 | } | |
1828 | } | |
1829 | break; | |
c5aa993b JM |
1830 | |
1831 | case 0x8: | |
1832 | case 0x9: /* block transfer */ | |
c906108c SS |
1833 | if (bit (this_instr, 20)) |
1834 | { | |
1835 | /* LDM */ | |
1836 | if (bit (this_instr, 15)) | |
1837 | { | |
1838 | /* loading pc */ | |
1839 | int offset = 0; | |
1840 | ||
1841 | if (bit (this_instr, 23)) | |
1842 | { | |
1843 | /* up */ | |
1844 | unsigned long reglist = bits (this_instr, 0, 14); | |
1845 | offset = bitcount (reglist) * 4; | |
c5aa993b | 1846 | if (bit (this_instr, 24)) /* pre */ |
c906108c SS |
1847 | offset += 4; |
1848 | } | |
1849 | else if (bit (this_instr, 24)) | |
1850 | offset = -4; | |
c5aa993b | 1851 | |
c906108c | 1852 | { |
c5aa993b JM |
1853 | unsigned long rn_val = |
1854 | read_register (bits (this_instr, 16, 19)); | |
c906108c SS |
1855 | nextpc = |
1856 | (CORE_ADDR) read_memory_integer ((CORE_ADDR) (rn_val | |
c5aa993b | 1857 | + offset), |
c906108c SS |
1858 | 4); |
1859 | } | |
1860 | nextpc = ADDR_BITS_REMOVE (nextpc); | |
1861 | if (nextpc == pc) | |
1862 | error ("Infinite loop detected"); | |
1863 | } | |
1864 | } | |
1865 | break; | |
c5aa993b JM |
1866 | |
1867 | case 0xb: /* branch & link */ | |
1868 | case 0xa: /* branch */ | |
c906108c SS |
1869 | { |
1870 | nextpc = BranchDest (pc, this_instr); | |
1871 | ||
1872 | nextpc = ADDR_BITS_REMOVE (nextpc); | |
1873 | if (nextpc == pc) | |
1874 | error ("Infinite loop detected"); | |
1875 | break; | |
1876 | } | |
c5aa993b JM |
1877 | |
1878 | case 0xc: | |
1879 | case 0xd: | |
1880 | case 0xe: /* coproc ops */ | |
1881 | case 0xf: /* SWI */ | |
c906108c SS |
1882 | break; |
1883 | ||
1884 | default: | |
1885 | fprintf (stderr, "Bad bit-field extraction\n"); | |
1886 | return (pc); | |
1887 | } | |
1888 | } | |
1889 | ||
1890 | return nextpc; | |
1891 | } | |
1892 | ||
9512d7fd FN |
1893 | /* single_step() is called just before we want to resume the inferior, |
1894 | if we want to single-step it but there is no hardware or kernel | |
1895 | single-step support. We find the target of the coming instruction | |
1896 | and breakpoint it. | |
1897 | ||
1898 | single_step is also called just after the inferior stops. If we had | |
1899 | set up a simulated single-step, we undo our damage. */ | |
1900 | ||
1901 | void | |
1902 | arm_software_single_step (ignore, insert_bpt) | |
1903 | int ignore; /* Signal, not needed */ | |
1904 | int insert_bpt; | |
1905 | { | |
1906 | static int next_pc; /* State between setting and unsetting. */ | |
1907 | static char break_mem[BREAKPOINT_MAX]; /* Temporary storage for mem@bpt */ | |
1908 | ||
1909 | if (insert_bpt) | |
1910 | { | |
1911 | next_pc = arm_get_next_pc (read_register (PC_REGNUM)); | |
80fcf3f0 | 1912 | target_insert_breakpoint (next_pc, break_mem); |
9512d7fd FN |
1913 | } |
1914 | else | |
80fcf3f0 | 1915 | target_remove_breakpoint (next_pc, break_mem); |
9512d7fd | 1916 | } |
9512d7fd | 1917 | |
c906108c SS |
1918 | #include "bfd-in2.h" |
1919 | #include "libcoff.h" | |
1920 | ||
1921 | static int | |
ed9a39eb | 1922 | gdb_print_insn_arm (bfd_vma memaddr, disassemble_info *info) |
c906108c SS |
1923 | { |
1924 | if (arm_pc_is_thumb (memaddr)) | |
1925 | { | |
c5aa993b JM |
1926 | static asymbol *asym; |
1927 | static combined_entry_type ce; | |
1928 | static struct coff_symbol_struct csym; | |
1929 | static struct _bfd fake_bfd; | |
1930 | static bfd_target fake_target; | |
c906108c SS |
1931 | |
1932 | if (csym.native == NULL) | |
1933 | { | |
1934 | /* Create a fake symbol vector containing a Thumb symbol. This is | |
1935 | solely so that the code in print_insn_little_arm() and | |
1936 | print_insn_big_arm() in opcodes/arm-dis.c will detect the presence | |
1937 | of a Thumb symbol and switch to decoding Thumb instructions. */ | |
c5aa993b JM |
1938 | |
1939 | fake_target.flavour = bfd_target_coff_flavour; | |
1940 | fake_bfd.xvec = &fake_target; | |
c906108c | 1941 | ce.u.syment.n_sclass = C_THUMBEXTFUNC; |
c5aa993b JM |
1942 | csym.native = &ce; |
1943 | csym.symbol.the_bfd = &fake_bfd; | |
1944 | csym.symbol.name = "fake"; | |
1945 | asym = (asymbol *) & csym; | |
c906108c | 1946 | } |
c5aa993b | 1947 | |
c906108c | 1948 | memaddr = UNMAKE_THUMB_ADDR (memaddr); |
c5aa993b | 1949 | info->symbols = &asym; |
c906108c SS |
1950 | } |
1951 | else | |
1952 | info->symbols = NULL; | |
c5aa993b | 1953 | |
c906108c SS |
1954 | if (TARGET_BYTE_ORDER == BIG_ENDIAN) |
1955 | return print_insn_big_arm (memaddr, info); | |
1956 | else | |
1957 | return print_insn_little_arm (memaddr, info); | |
1958 | } | |
1959 | ||
ed9a39eb JM |
1960 | /* This function implements the BREAKPOINT_FROM_PC macro. It uses the |
1961 | program counter value to determine whether a 16-bit or 32-bit | |
1962 | breakpoint should be used. It returns a pointer to a string of | |
1963 | bytes that encode a breakpoint instruction, stores the length of | |
1964 | the string to *lenptr, and adjusts the program counter (if | |
1965 | necessary) to point to the actual memory location where the | |
c906108c SS |
1966 | breakpoint should be inserted. */ |
1967 | ||
1968 | unsigned char * | |
ed9a39eb | 1969 | arm_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr) |
c906108c SS |
1970 | { |
1971 | if (arm_pc_is_thumb (*pcptr) || arm_pc_is_thumb_dummy (*pcptr)) | |
1972 | { | |
1973 | if (TARGET_BYTE_ORDER == BIG_ENDIAN) | |
c5aa993b JM |
1974 | { |
1975 | static char thumb_breakpoint[] = THUMB_BE_BREAKPOINT; | |
1976 | *pcptr = UNMAKE_THUMB_ADDR (*pcptr); | |
1977 | *lenptr = sizeof (thumb_breakpoint); | |
1978 | return thumb_breakpoint; | |
1979 | } | |
c906108c | 1980 | else |
c5aa993b JM |
1981 | { |
1982 | static char thumb_breakpoint[] = THUMB_LE_BREAKPOINT; | |
1983 | *pcptr = UNMAKE_THUMB_ADDR (*pcptr); | |
1984 | *lenptr = sizeof (thumb_breakpoint); | |
1985 | return thumb_breakpoint; | |
1986 | } | |
c906108c SS |
1987 | } |
1988 | else | |
1989 | { | |
1990 | if (TARGET_BYTE_ORDER == BIG_ENDIAN) | |
c5aa993b JM |
1991 | { |
1992 | static char arm_breakpoint[] = ARM_BE_BREAKPOINT; | |
1993 | *lenptr = sizeof (arm_breakpoint); | |
1994 | return arm_breakpoint; | |
1995 | } | |
c906108c | 1996 | else |
c5aa993b JM |
1997 | { |
1998 | static char arm_breakpoint[] = ARM_LE_BREAKPOINT; | |
1999 | *lenptr = sizeof (arm_breakpoint); | |
2000 | return arm_breakpoint; | |
2001 | } | |
c906108c SS |
2002 | } |
2003 | } | |
ed9a39eb JM |
2004 | |
2005 | /* Extract from an array REGBUF containing the (raw) register state a | |
2006 | function return value of type TYPE, and copy that, in virtual | |
2007 | format, into VALBUF. */ | |
2008 | ||
2009 | void | |
2010 | arm_extract_return_value (struct type *type, | |
2011 | char regbuf[REGISTER_BYTES], | |
2012 | char *valbuf) | |
2013 | { | |
2014 | if (TYPE_CODE_FLT == TYPE_CODE (type)) | |
2015 | convert_from_extended (®buf[REGISTER_BYTE (F0_REGNUM)], valbuf); | |
2016 | else | |
2017 | memcpy (valbuf, ®buf[REGISTER_BYTE (A1_REGNUM)], TYPE_LENGTH (type)); | |
2018 | } | |
2019 | ||
2020 | /* Return non-zero if the PC is inside a thumb call thunk. */ | |
c906108c SS |
2021 | |
2022 | int | |
ed9a39eb | 2023 | arm_in_call_stub (CORE_ADDR pc, char *name) |
c906108c SS |
2024 | { |
2025 | CORE_ADDR start_addr; | |
2026 | ||
ed9a39eb JM |
2027 | /* Find the starting address of the function containing the PC. If |
2028 | the caller didn't give us a name, look it up at the same time. */ | |
c906108c SS |
2029 | if (find_pc_partial_function (pc, name ? NULL : &name, &start_addr, NULL) == 0) |
2030 | return 0; | |
2031 | ||
2032 | return strncmp (name, "_call_via_r", 11) == 0; | |
2033 | } | |
2034 | ||
ed9a39eb JM |
2035 | /* If PC is in a Thumb call or return stub, return the address of the |
2036 | target PC, which is in a register. The thunk functions are called | |
2037 | _called_via_xx, where x is the register name. The possible names | |
2038 | are r0-r9, sl, fp, ip, sp, and lr. */ | |
c906108c SS |
2039 | |
2040 | CORE_ADDR | |
ed9a39eb | 2041 | arm_skip_stub (CORE_ADDR pc) |
c906108c | 2042 | { |
c5aa993b | 2043 | char *name; |
c906108c SS |
2044 | CORE_ADDR start_addr; |
2045 | ||
2046 | /* Find the starting address and name of the function containing the PC. */ | |
2047 | if (find_pc_partial_function (pc, &name, &start_addr, NULL) == 0) | |
2048 | return 0; | |
2049 | ||
2050 | /* Call thunks always start with "_call_via_". */ | |
2051 | if (strncmp (name, "_call_via_", 10) == 0) | |
2052 | { | |
ed9a39eb JM |
2053 | /* Use the name suffix to determine which register contains the |
2054 | target PC. */ | |
c5aa993b JM |
2055 | static char *table[15] = |
2056 | {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", | |
2057 | "r8", "r9", "sl", "fp", "ip", "sp", "lr" | |
2058 | }; | |
c906108c SS |
2059 | int regno; |
2060 | ||
2061 | for (regno = 0; regno <= 14; regno++) | |
2062 | if (strcmp (&name[10], table[regno]) == 0) | |
2063 | return read_register (regno); | |
2064 | } | |
ed9a39eb | 2065 | |
c5aa993b | 2066 | return 0; /* not a stub */ |
c906108c SS |
2067 | } |
2068 | ||
bc90b915 FN |
2069 | /* If the user changes the register disassembly flavor used for info register |
2070 | and other commands, we have to also switch the flavor used in opcodes | |
2071 | for disassembly output. | |
2072 | This function is run in the set disassembly_flavor command, and does that. */ | |
2073 | ||
2074 | static void | |
2075 | set_disassembly_flavor_sfunc (char *args, int from_tty, | |
2076 | struct cmd_list_element *c) | |
2077 | { | |
2078 | set_disassembly_flavor (); | |
2079 | } | |
2080 | \f | |
2081 | static void | |
2082 | set_disassembly_flavor (void) | |
2083 | { | |
2084 | const char *setname, *setdesc, **regnames; | |
2085 | int numregs, j; | |
2086 | ||
2087 | /* Find the flavor that the user wants in the opcodes table. */ | |
2088 | int current = 0; | |
2089 | numregs = get_arm_regnames (current, &setname, &setdesc, ®names); | |
2090 | while ((disassembly_flavor != setname) | |
2091 | && (current < num_flavor_options)) | |
2092 | get_arm_regnames (++current, &setname, &setdesc, ®names); | |
2093 | current_option = current; | |
2094 | ||
2095 | /* Fill our copy. */ | |
2096 | for (j = 0; j < numregs; j++) | |
2097 | arm_register_names[j] = (char *) regnames[j]; | |
2098 | ||
2099 | /* Adjust case. */ | |
2100 | if (isupper (*regnames[PC_REGNUM])) | |
2101 | { | |
2102 | arm_register_names[FPS_REGNUM] = "FPS"; | |
2103 | arm_register_names[PS_REGNUM] = "CPSR"; | |
2104 | } | |
2105 | else | |
2106 | { | |
2107 | arm_register_names[FPS_REGNUM] = "fps"; | |
2108 | arm_register_names[PS_REGNUM] = "cpsr"; | |
2109 | } | |
2110 | ||
2111 | /* Synchronize the disassembler. */ | |
2112 | set_arm_regname_option (current); | |
2113 | } | |
2114 | ||
2115 | /* arm_othernames implements the "othernames" command. This is kind | |
2116 | of hacky, and I prefer the set-show disassembly-flavor which is | |
2117 | also used for the x86 gdb. I will keep this around, however, in | |
2118 | case anyone is actually using it. */ | |
2119 | ||
2120 | static void | |
2121 | arm_othernames (char *names, int n) | |
2122 | { | |
2123 | /* Circle through the various flavors. */ | |
2124 | current_option = (current_option + 1) % num_flavor_options; | |
2125 | ||
2126 | disassembly_flavor = valid_flavors[current_option]; | |
2127 | set_disassembly_flavor (); | |
2128 | } | |
2129 | ||
a42dd537 KB |
2130 | /* Fetch, and possibly build, an appropriate link_map_offsets structure |
2131 | for ARM linux targets using the struct offsets defined in <link.h>. | |
2132 | Note, however, that link.h is not actually referred to in this file. | |
2133 | Instead, the relevant structs offsets were obtained from examining | |
2134 | link.h. (We can't refer to link.h from this file because the host | |
2135 | system won't necessarily have it, or if it does, the structs which | |
2136 | it defines will refer to the host system, not the target.) */ | |
2137 | ||
2138 | struct link_map_offsets * | |
2139 | arm_linux_svr4_fetch_link_map_offsets (void) | |
2140 | { | |
2141 | static struct link_map_offsets lmo; | |
2142 | static struct link_map_offsets *lmp = 0; | |
2143 | ||
2144 | if (lmp == 0) | |
2145 | { | |
2146 | lmp = &lmo; | |
2147 | ||
2148 | lmo.r_debug_size = 8; /* Actual size is 20, but this is all we | |
2149 | need. */ | |
2150 | ||
2151 | lmo.r_map_offset = 4; | |
2152 | lmo.r_map_size = 4; | |
2153 | ||
2154 | lmo.link_map_size = 20; /* Actual size is 552, but this is all we | |
2155 | need. */ | |
2156 | ||
2157 | lmo.l_addr_offset = 0; | |
2158 | lmo.l_addr_size = 4; | |
2159 | ||
2160 | lmo.l_name_offset = 4; | |
2161 | lmo.l_name_size = 4; | |
2162 | ||
2163 | lmo.l_next_offset = 12; | |
2164 | lmo.l_next_size = 4; | |
2165 | ||
2166 | lmo.l_prev_offset = 16; | |
2167 | lmo.l_prev_size = 4; | |
2168 | } | |
2169 | ||
2170 | return lmp; | |
2171 | } | |
2172 | ||
c906108c | 2173 | void |
ed9a39eb | 2174 | _initialize_arm_tdep (void) |
c906108c | 2175 | { |
bc90b915 FN |
2176 | struct ui_file *stb; |
2177 | long length; | |
96baa820 | 2178 | struct cmd_list_element *new_cmd; |
53904c9e AC |
2179 | const char *setname; |
2180 | const char *setdesc; | |
2181 | const char **regnames; | |
bc90b915 FN |
2182 | int numregs, i, j; |
2183 | static char *helptext; | |
085dd6e6 | 2184 | |
c906108c | 2185 | tm_print_insn = gdb_print_insn_arm; |
ed9a39eb | 2186 | |
bc90b915 FN |
2187 | /* Get the number of possible sets of register names defined in opcodes. */ |
2188 | num_flavor_options = get_arm_regname_num_options (); | |
2189 | ||
085dd6e6 | 2190 | /* Sync the opcode insn printer with our register viewer: */ |
bc90b915 | 2191 | parse_arm_disassembler_option ("reg-names-std"); |
c5aa993b | 2192 | |
bc90b915 FN |
2193 | /* Begin creating the help text. */ |
2194 | stb = mem_fileopen (); | |
2195 | fprintf_unfiltered (stb, "Set the disassembly flavor.\n\ | |
2196 | The valid values are:\n"); | |
ed9a39eb | 2197 | |
bc90b915 FN |
2198 | /* Initialize the array that will be passed to add_set_enum_cmd(). */ |
2199 | valid_flavors = xmalloc ((num_flavor_options + 1) * sizeof (char *)); | |
2200 | for (i = 0; i < num_flavor_options; i++) | |
2201 | { | |
2202 | numregs = get_arm_regnames (i, &setname, &setdesc, ®names); | |
53904c9e | 2203 | valid_flavors[i] = setname; |
bc90b915 FN |
2204 | fprintf_unfiltered (stb, "%s - %s\n", setname, |
2205 | setdesc); | |
2206 | /* Copy the default names (if found) and synchronize disassembler. */ | |
2207 | if (!strcmp (setname, "std")) | |
2208 | { | |
53904c9e | 2209 | disassembly_flavor = setname; |
bc90b915 FN |
2210 | current_option = i; |
2211 | for (j = 0; j < numregs; j++) | |
2212 | arm_register_names[j] = (char *) regnames[j]; | |
2213 | set_arm_regname_option (i); | |
2214 | } | |
2215 | } | |
2216 | /* Mark the end of valid options. */ | |
2217 | valid_flavors[num_flavor_options] = NULL; | |
c906108c | 2218 | |
bc90b915 FN |
2219 | /* Finish the creation of the help text. */ |
2220 | fprintf_unfiltered (stb, "The default is \"std\"."); | |
2221 | helptext = ui_file_xstrdup (stb, &length); | |
2222 | ui_file_delete (stb); | |
ed9a39eb | 2223 | |
bc90b915 | 2224 | /* Add the disassembly-flavor command */ |
96baa820 | 2225 | new_cmd = add_set_enum_cmd ("disassembly-flavor", no_class, |
ed9a39eb | 2226 | valid_flavors, |
1ed2a135 | 2227 | &disassembly_flavor, |
bc90b915 | 2228 | helptext, |
ed9a39eb | 2229 | &setlist); |
96baa820 | 2230 | new_cmd->function.sfunc = set_disassembly_flavor_sfunc; |
ed9a39eb JM |
2231 | add_show_from_set (new_cmd, &showlist); |
2232 | ||
c906108c SS |
2233 | /* ??? Maybe this should be a boolean. */ |
2234 | add_show_from_set (add_set_cmd ("apcs32", no_class, | |
ed9a39eb | 2235 | var_zinteger, (char *) &arm_apcs_32, |
96baa820 | 2236 | "Set usage of ARM 32-bit mode.\n", &setlist), |
ed9a39eb | 2237 | &showlist); |
c906108c | 2238 | |
bc90b915 FN |
2239 | /* Add the deprecated "othernames" command */ |
2240 | ||
2241 | add_com ("othernames", class_obscure, arm_othernames, | |
2242 | "Switch to the next set of register names."); | |
c906108c SS |
2243 | } |
2244 | ||
ed9a39eb JM |
2245 | /* Test whether the coff symbol specific value corresponds to a Thumb |
2246 | function. */ | |
2247 | ||
c906108c | 2248 | int |
c5aa993b | 2249 | coff_sym_is_thumb (int val) |
c906108c | 2250 | { |
c5aa993b JM |
2251 | return (val == C_THUMBEXT || |
2252 | val == C_THUMBSTAT || | |
2253 | val == C_THUMBEXTFUNC || | |
2254 | val == C_THUMBSTATFUNC || | |
2255 | val == C_THUMBLABEL); | |
c906108c | 2256 | } |