1 /* Target-dependent code for FT32.
3 Copyright (C) 2009-2015 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
22 #include "frame-unwind.h"
23 #include "frame-base.h"
34 #include "arch-utils.h"
36 #include "trad-frame.h"
40 #include "opcode/ft32.h"
42 #include "ft32-tdep.h"
43 #include "gdb/sim-ft32.h"
45 #define RAM_BIAS 0x800000 /* Bias added to RAM addresses. */
47 /* Local functions. */
49 extern void _initialize_ft32_tdep (void);
51 /* Use an invalid address -1 as 'not available' marker. */
52 enum { REG_UNAVAIL = (CORE_ADDR) (-1) };
54 struct ft32_frame_cache
56 /* Base address of the frame */
58 /* Function this frame belongs to */
60 /* Total size of this frame */
62 /* Saved registers in this frame */
63 CORE_ADDR saved_regs[FT32_NUM_REGS];
64 /* Saved SP in this frame */
66 /* Has the new frame been LINKed. */
67 bfd_boolean established;
70 /* Implement the "frame_align" gdbarch method. */
73 ft32_frame_align (struct gdbarch *gdbarch, CORE_ADDR sp)
75 /* Align to the size of an instruction (so that they can safely be
76 pushed onto the stack. */
80 /* Implement the "breakpoint_from_pc" gdbarch method. */
82 static const unsigned char *
83 ft32_breakpoint_from_pc (struct gdbarch *gdbarch,
84 CORE_ADDR *pcptr, int *lenptr)
86 static const gdb_byte breakpoint[] = { 0x02, 0x00, 0x34, 0x00 };
88 *lenptr = sizeof (breakpoint);
92 /* FT32 register names. */
94 static const char *const ft32_register_names[] =
97 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
98 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
99 "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
100 "r24", "r25", "r26", "r27", "r28", "cc",
104 /* Implement the "register_name" gdbarch method. */
107 ft32_register_name (struct gdbarch *gdbarch, int reg_nr)
111 if (reg_nr >= FT32_NUM_REGS)
113 return ft32_register_names[reg_nr];
116 /* Implement the "register_type" gdbarch method. */
119 ft32_register_type (struct gdbarch *gdbarch, int reg_nr)
121 if (reg_nr == FT32_PC_REGNUM)
122 return gdbarch_tdep (gdbarch)->pc_type;
123 else if (reg_nr == FT32_SP_REGNUM || reg_nr == FT32_FP_REGNUM)
124 return builtin_type (gdbarch)->builtin_data_ptr;
126 return builtin_type (gdbarch)->builtin_int32;
129 /* Write into appropriate registers a function return value
130 of type TYPE, given in virtual format. */
133 ft32_store_return_value (struct type *type, struct regcache *regcache,
134 const gdb_byte *valbuf)
136 struct gdbarch *gdbarch = get_regcache_arch (regcache);
137 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
139 int len = TYPE_LENGTH (type);
141 /* Things always get returned in RET1_REGNUM, RET2_REGNUM. */
142 regval = extract_unsigned_integer (valbuf, len > 4 ? 4 : len, byte_order);
143 regcache_cooked_write_unsigned (regcache, FT32_R0_REGNUM, regval);
146 regval = extract_unsigned_integer (valbuf + 4,
147 len - 4, byte_order);
148 regcache_cooked_write_unsigned (regcache, FT32_R1_REGNUM, regval);
152 /* Decode the instructions within the given address range. Decide
153 when we must have reached the end of the function prologue. If a
154 frame_info pointer is provided, fill in its saved_regs etc.
156 Returns the address of the first instruction after the prologue. */
159 ft32_analyze_prologue (CORE_ADDR start_addr, CORE_ADDR end_addr,
160 struct ft32_frame_cache *cache,
161 struct gdbarch *gdbarch)
163 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
165 ULONGEST inst, inst2;
168 struct bound_minimal_symbol msymbol;
169 const int first_saved_reg = 13; /* The first saved register. */
170 /* PROLOGS are addresses of the subroutine prologs, PROLOGS[n]
171 is the address of __prolog_$rN.
172 __prolog_$rN pushes registers from 13 through n inclusive.
173 So for example CALL __prolog_$r15 is equivalent to:
177 Note that PROLOGS[0] through PROLOGS[12] are unused. */
178 CORE_ADDR prologs[32];
180 cache->saved_regs[FT32_PC_REGNUM] = 0;
181 cache->framesize = 0;
183 for (regnum = first_saved_reg; regnum < 32; regnum++)
185 char prolog_symbol[32];
187 snprintf (prolog_symbol, sizeof (prolog_symbol), "__prolog_$r%02d",
189 msymbol = lookup_minimal_symbol (prolog_symbol, NULL, NULL);
191 prologs[regnum] = BMSYMBOL_VALUE_ADDRESS (msymbol);
196 if (start_addr >= end_addr)
199 cache->established = 0;
200 for (next_addr = start_addr; next_addr < end_addr;)
202 inst = read_memory_unsigned_integer (next_addr, 4, byte_order);
204 if (FT32_IS_PUSH (inst))
206 pushreg = FT32_PUSH_REG (inst);
207 cache->framesize += 4;
208 cache->saved_regs[FT32_R0_REGNUM + pushreg] = cache->framesize;
211 else if (FT32_IS_CALL (inst))
213 for (regnum = first_saved_reg; regnum < 32; regnum++)
215 if ((4 * (inst & 0x3ffff)) == prologs[regnum])
217 for (pushreg = first_saved_reg; pushreg <= regnum;
220 cache->framesize += 4;
221 cache->saved_regs[FT32_R0_REGNUM + pushreg] =
232 for (regnum = FT32_R0_REGNUM; regnum < FT32_PC_REGNUM; regnum++)
234 if (cache->saved_regs[regnum] != REG_UNAVAIL)
235 cache->saved_regs[regnum] =
236 cache->framesize - cache->saved_regs[regnum];
238 cache->saved_regs[FT32_PC_REGNUM] = cache->framesize;
241 if (next_addr < end_addr)
243 inst = read_memory_unsigned_integer (next_addr, 4, byte_order);
244 if (FT32_IS_LINK (inst))
246 cache->established = 1;
247 for (regnum = FT32_R0_REGNUM; regnum < FT32_PC_REGNUM; regnum++)
249 if (cache->saved_regs[regnum] != REG_UNAVAIL)
250 cache->saved_regs[regnum] += 4;
252 cache->saved_regs[FT32_PC_REGNUM] = cache->framesize + 4;
253 cache->saved_regs[FT32_FP_REGNUM] = 0;
254 cache->framesize += FT32_LINK_SIZE (inst);
262 /* Find the end of function prologue. */
265 ft32_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
267 CORE_ADDR func_addr = 0, func_end = 0;
268 const char *func_name;
270 /* See if we can determine the end of the prologue via the symbol table.
271 If so, then return either PC, or the PC after the prologue, whichever
273 if (find_pc_partial_function (pc, &func_name, &func_addr, &func_end))
275 CORE_ADDR post_prologue_pc
276 = skip_prologue_using_sal (gdbarch, func_addr);
277 if (post_prologue_pc != 0)
278 return max (pc, post_prologue_pc);
281 /* Can't determine prologue from the symbol table, need to examine
283 struct symtab_and_line sal;
285 struct ft32_frame_cache cache;
288 memset (&cache, 0, sizeof cache);
290 plg_end = ft32_analyze_prologue (func_addr,
291 func_end, &cache, gdbarch);
292 /* Found a function. */
293 sym = lookup_symbol (func_name, NULL, VAR_DOMAIN, NULL).symbol;
294 /* Don't use line number debug info for assembly source files. */
295 if ((sym != NULL) && SYMBOL_LANGUAGE (sym) != language_asm)
297 sal = find_pc_line (func_addr, 0);
298 if (sal.end && sal.end < func_end)
300 /* Found a line number, use it as end of prologue. */
304 /* No useable line symbol. Use result of prologue parsing method. */
309 /* No function symbol -- just return the PC. */
313 /* Implementation of `pointer_to_address' gdbarch method.
315 On FT32 address space zero is RAM, address space 1 is flash.
316 RAM appears at address RAM_BIAS, flash at address 0. */
319 ft32_pointer_to_address (struct gdbarch *gdbarch,
320 struct type *type, const gdb_byte *buf)
322 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
324 = extract_unsigned_integer (buf, TYPE_LENGTH (type), byte_order);
326 if (TYPE_ADDRESS_CLASS_1 (type))
329 return addr | RAM_BIAS;
332 /* Implementation of `address_class_type_flags' gdbarch method.
334 This method maps DW_AT_address_class attributes to a
335 type_instance_flag_value. */
338 ft32_address_class_type_flags (int byte_size, int dwarf2_addr_class)
340 /* The value 1 of the DW_AT_address_class attribute corresponds to the
341 __flash__ qualifier, meaning pointer to data in FT32 program memory.
343 if (dwarf2_addr_class == 1)
344 return TYPE_INSTANCE_FLAG_ADDRESS_CLASS_1;
348 /* Implementation of `address_class_type_flags_to_name' gdbarch method.
350 Convert a type_instance_flag_value to an address space qualifier. */
353 ft32_address_class_type_flags_to_name (struct gdbarch *gdbarch, int type_flags)
355 if (type_flags & TYPE_INSTANCE_FLAG_ADDRESS_CLASS_1)
361 /* Implementation of `address_class_name_to_type_flags' gdbarch method.
363 Convert an address space qualifier to a type_instance_flag_value. */
366 ft32_address_class_name_to_type_flags (struct gdbarch *gdbarch,
370 if (strcmp (name, "flash") == 0)
372 *type_flags_ptr = TYPE_INSTANCE_FLAG_ADDRESS_CLASS_1;
380 /* Implement the "read_pc" gdbarch method. */
383 ft32_read_pc (struct regcache *regcache)
387 regcache_cooked_read_unsigned (regcache, FT32_PC_REGNUM, &pc);
391 /* Implement the "write_pc" gdbarch method. */
394 ft32_write_pc (struct regcache *regcache, CORE_ADDR val)
396 regcache_cooked_write_unsigned (regcache, FT32_PC_REGNUM, val);
399 /* Implement the "unwind_sp" gdbarch method. */
402 ft32_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame)
404 return frame_unwind_register_unsigned (next_frame, FT32_SP_REGNUM);
407 /* Given a return value in `regbuf' with a type `valtype',
408 extract and copy its value into `valbuf'. */
411 ft32_extract_return_value (struct type *type, struct regcache *regcache,
414 struct gdbarch *gdbarch = get_regcache_arch (regcache);
415 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
416 bfd_byte *valbuf = dst;
417 int len = TYPE_LENGTH (type);
420 /* By using store_unsigned_integer we avoid having to do
421 anything special for small big-endian values. */
422 regcache_cooked_read_unsigned (regcache, FT32_R0_REGNUM, &tmp);
423 store_unsigned_integer (valbuf, (len > 4 ? len - 4 : len), byte_order, tmp);
425 /* Ignore return values more than 8 bytes in size because the ft32
426 returns anything more than 8 bytes in the stack. */
429 regcache_cooked_read_unsigned (regcache, FT32_R1_REGNUM, &tmp);
430 store_unsigned_integer (valbuf + len - 4, 4, byte_order, tmp);
434 /* Implement the "return_value" gdbarch method. */
436 static enum return_value_convention
437 ft32_return_value (struct gdbarch *gdbarch, struct value *function,
438 struct type *valtype, struct regcache *regcache,
439 gdb_byte *readbuf, const gdb_byte *writebuf)
441 if (TYPE_LENGTH (valtype) > 8)
442 return RETURN_VALUE_STRUCT_CONVENTION;
446 ft32_extract_return_value (valtype, regcache, readbuf);
447 if (writebuf != NULL)
448 ft32_store_return_value (valtype, regcache, writebuf);
449 return RETURN_VALUE_REGISTER_CONVENTION;
453 /* Allocate and initialize a ft32_frame_cache object. */
455 static struct ft32_frame_cache *
456 ft32_alloc_frame_cache (void)
458 struct ft32_frame_cache *cache;
461 cache = FRAME_OBSTACK_ZALLOC (struct ft32_frame_cache);
463 for (i = 0; i < FT32_NUM_REGS; ++i)
464 cache->saved_regs[i] = REG_UNAVAIL;
469 /* Populate a ft32_frame_cache object for this_frame. */
471 static struct ft32_frame_cache *
472 ft32_frame_cache (struct frame_info *this_frame, void **this_cache)
474 struct ft32_frame_cache *cache;
475 CORE_ADDR current_pc;
479 return (struct ft32_frame_cache *) *this_cache;
481 cache = ft32_alloc_frame_cache ();
484 cache->base = get_frame_register_unsigned (this_frame, FT32_FP_REGNUM);
485 if (cache->base == 0)
488 cache->pc = get_frame_func (this_frame);
489 current_pc = get_frame_pc (this_frame);
492 struct gdbarch *gdbarch = get_frame_arch (this_frame);
494 ft32_analyze_prologue (cache->pc, current_pc, cache, gdbarch);
495 if (!cache->established)
496 cache->base = get_frame_register_unsigned (this_frame, FT32_SP_REGNUM);
499 cache->saved_sp = cache->base - 4;
501 for (i = 0; i < FT32_NUM_REGS; ++i)
502 if (cache->saved_regs[i] != REG_UNAVAIL)
503 cache->saved_regs[i] = cache->base + cache->saved_regs[i];
508 /* Implement the "unwind_pc" gdbarch method. */
511 ft32_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
513 return frame_unwind_register_unsigned (next_frame, FT32_PC_REGNUM);
516 /* Given a GDB frame, determine the address of the calling function's
517 frame. This will be used to create a new GDB frame struct. */
520 ft32_frame_this_id (struct frame_info *this_frame,
521 void **this_prologue_cache, struct frame_id *this_id)
523 struct ft32_frame_cache *cache = ft32_frame_cache (this_frame,
524 this_prologue_cache);
526 /* This marks the outermost frame. */
527 if (cache->base == 0)
530 *this_id = frame_id_build (cache->saved_sp, cache->pc);
533 /* Get the value of register regnum in the previous stack frame. */
535 static struct value *
536 ft32_frame_prev_register (struct frame_info *this_frame,
537 void **this_prologue_cache, int regnum)
539 struct ft32_frame_cache *cache = ft32_frame_cache (this_frame,
540 this_prologue_cache);
542 gdb_assert (regnum >= 0);
544 if (regnum == FT32_SP_REGNUM && cache->saved_sp)
545 return frame_unwind_got_constant (this_frame, regnum, cache->saved_sp);
547 if (regnum < FT32_NUM_REGS && cache->saved_regs[regnum] != REG_UNAVAIL)
548 return frame_unwind_got_memory (this_frame, regnum,
549 RAM_BIAS | cache->saved_regs[regnum]);
551 return frame_unwind_got_register (this_frame, regnum, regnum);
554 static const struct frame_unwind ft32_frame_unwind =
557 default_frame_unwind_stop_reason,
559 ft32_frame_prev_register,
561 default_frame_sniffer
564 /* Return the base address of this_frame. */
567 ft32_frame_base_address (struct frame_info *this_frame, void **this_cache)
569 struct ft32_frame_cache *cache = ft32_frame_cache (this_frame,
575 static const struct frame_base ft32_frame_base =
578 ft32_frame_base_address,
579 ft32_frame_base_address,
580 ft32_frame_base_address
583 static struct frame_id
584 ft32_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame)
586 CORE_ADDR sp = get_frame_register_unsigned (this_frame, FT32_SP_REGNUM);
588 return frame_id_build (sp, get_frame_pc (this_frame));
591 /* Allocate and initialize the ft32 gdbarch object. */
593 static struct gdbarch *
594 ft32_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
596 struct gdbarch *gdbarch;
597 struct gdbarch_tdep *tdep;
598 struct type *void_type;
599 struct type *func_void_type;
601 /* If there is already a candidate, use it. */
602 arches = gdbarch_list_lookup_by_info (arches, &info);
604 return arches->gdbarch;
606 /* Allocate space for the new architecture. */
607 tdep = XNEW (struct gdbarch_tdep);
608 gdbarch = gdbarch_alloc (&info, tdep);
610 /* Create a type for PC. We can't use builtin types here, as they may not
612 void_type = arch_type (gdbarch, TYPE_CODE_VOID, 1, "void");
613 func_void_type = make_function_type (void_type, NULL);
614 tdep->pc_type = arch_type (gdbarch, TYPE_CODE_PTR, 4, NULL);
615 TYPE_TARGET_TYPE (tdep->pc_type) = func_void_type;
616 TYPE_UNSIGNED (tdep->pc_type) = 1;
617 TYPE_INSTANCE_FLAGS (tdep->pc_type) |= TYPE_INSTANCE_FLAG_ADDRESS_CLASS_1;
619 set_gdbarch_read_pc (gdbarch, ft32_read_pc);
620 set_gdbarch_write_pc (gdbarch, ft32_write_pc);
621 set_gdbarch_unwind_sp (gdbarch, ft32_unwind_sp);
623 set_gdbarch_num_regs (gdbarch, FT32_NUM_REGS);
624 set_gdbarch_sp_regnum (gdbarch, FT32_SP_REGNUM);
625 set_gdbarch_pc_regnum (gdbarch, FT32_PC_REGNUM);
626 set_gdbarch_register_name (gdbarch, ft32_register_name);
627 set_gdbarch_register_type (gdbarch, ft32_register_type);
629 set_gdbarch_return_value (gdbarch, ft32_return_value);
631 set_gdbarch_pointer_to_address (gdbarch, ft32_pointer_to_address);
633 set_gdbarch_skip_prologue (gdbarch, ft32_skip_prologue);
634 set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
635 set_gdbarch_breakpoint_from_pc (gdbarch, ft32_breakpoint_from_pc);
636 set_gdbarch_frame_align (gdbarch, ft32_frame_align);
638 frame_base_set_default (gdbarch, &ft32_frame_base);
640 /* Methods for saving / extracting a dummy frame's ID. The ID's
641 stack address must match the SP value returned by
642 PUSH_DUMMY_CALL, and saved by generic_save_dummy_frame_tos. */
643 set_gdbarch_dummy_id (gdbarch, ft32_dummy_id);
645 set_gdbarch_unwind_pc (gdbarch, ft32_unwind_pc);
647 set_gdbarch_print_insn (gdbarch, print_insn_ft32);
649 /* Hook in ABI-specific overrides, if they have been registered. */
650 gdbarch_init_osabi (info, gdbarch);
652 /* Hook in the default unwinders. */
653 frame_unwind_append_unwinder (gdbarch, &ft32_frame_unwind);
655 /* Support simple overlay manager. */
656 set_gdbarch_overlay_update (gdbarch, simple_overlay_update);
658 set_gdbarch_address_class_type_flags (gdbarch, ft32_address_class_type_flags);
659 set_gdbarch_address_class_name_to_type_flags
660 (gdbarch, ft32_address_class_name_to_type_flags);
661 set_gdbarch_address_class_type_flags_to_name
662 (gdbarch, ft32_address_class_type_flags_to_name);
667 /* Register this machine's init routine. */
670 _initialize_ft32_tdep (void)
672 register_gdbarch_init (bfd_arch_ft32, ft32_gdbarch_init);