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TOMOYO Linux Cross Reference
Linux/arch/sh/include/asm/dwarf.h

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  1 /*
  2  * Copyright (C) 2009 Matt Fleming <matt@console-pimps.org>
  3  *
  4  * This file is subject to the terms and conditions of the GNU General Public
  5  * License.  See the file "COPYING" in the main directory of this archive
  6  * for more details.
  7  *
  8  */
  9 #ifndef __ASM_SH_DWARF_H
 10 #define __ASM_SH_DWARF_H
 11 
 12 #ifdef CONFIG_DWARF_UNWINDER
 13 
 14 /*
 15  * DWARF expression operations
 16  */
 17 #define DW_OP_addr      0x03
 18 #define DW_OP_deref     0x06
 19 #define DW_OP_const1u   0x08
 20 #define DW_OP_const1s   0x09
 21 #define DW_OP_const2u   0x0a
 22 #define DW_OP_const2s   0x0b
 23 #define DW_OP_const4u   0x0c
 24 #define DW_OP_const4s   0x0d
 25 #define DW_OP_const8u   0x0e
 26 #define DW_OP_const8s   0x0f
 27 #define DW_OP_constu    0x10
 28 #define DW_OP_consts    0x11
 29 #define DW_OP_dup       0x12
 30 #define DW_OP_drop      0x13
 31 #define DW_OP_over      0x14
 32 #define DW_OP_pick      0x15
 33 #define DW_OP_swap      0x16
 34 #define DW_OP_rot       0x17
 35 #define DW_OP_xderef    0x18
 36 #define DW_OP_abs       0x19
 37 #define DW_OP_and       0x1a
 38 #define DW_OP_div       0x1b
 39 #define DW_OP_minus     0x1c
 40 #define DW_OP_mod       0x1d
 41 #define DW_OP_mul       0x1e
 42 #define DW_OP_neg       0x1f
 43 #define DW_OP_not       0x20
 44 #define DW_OP_or        0x21
 45 #define DW_OP_plus      0x22
 46 #define DW_OP_plus_uconst       0x23
 47 #define DW_OP_shl       0x24
 48 #define DW_OP_shr       0x25
 49 #define DW_OP_shra      0x26
 50 #define DW_OP_xor       0x27
 51 #define DW_OP_skip      0x2f
 52 #define DW_OP_bra       0x28
 53 #define DW_OP_eq        0x29
 54 #define DW_OP_ge        0x2a
 55 #define DW_OP_gt        0x2b
 56 #define DW_OP_le        0x2c
 57 #define DW_OP_lt        0x2d
 58 #define DW_OP_ne        0x2e
 59 #define DW_OP_lit0      0x30
 60 #define DW_OP_lit1      0x31
 61 #define DW_OP_lit2      0x32
 62 #define DW_OP_lit3      0x33
 63 #define DW_OP_lit4      0x34
 64 #define DW_OP_lit5      0x35
 65 #define DW_OP_lit6      0x36
 66 #define DW_OP_lit7      0x37
 67 #define DW_OP_lit8      0x38
 68 #define DW_OP_lit9      0x39
 69 #define DW_OP_lit10     0x3a
 70 #define DW_OP_lit11     0x3b
 71 #define DW_OP_lit12     0x3c
 72 #define DW_OP_lit13     0x3d
 73 #define DW_OP_lit14     0x3e
 74 #define DW_OP_lit15     0x3f
 75 #define DW_OP_lit16     0x40
 76 #define DW_OP_lit17     0x41
 77 #define DW_OP_lit18     0x42
 78 #define DW_OP_lit19     0x43
 79 #define DW_OP_lit20     0x44
 80 #define DW_OP_lit21     0x45
 81 #define DW_OP_lit22     0x46
 82 #define DW_OP_lit23     0x47
 83 #define DW_OP_lit24     0x48
 84 #define DW_OP_lit25     0x49
 85 #define DW_OP_lit26     0x4a
 86 #define DW_OP_lit27     0x4b
 87 #define DW_OP_lit28     0x4c
 88 #define DW_OP_lit29     0x4d
 89 #define DW_OP_lit30     0x4e
 90 #define DW_OP_lit31     0x4f
 91 #define DW_OP_reg0      0x50
 92 #define DW_OP_reg1      0x51
 93 #define DW_OP_reg2      0x52
 94 #define DW_OP_reg3      0x53
 95 #define DW_OP_reg4      0x54
 96 #define DW_OP_reg5      0x55
 97 #define DW_OP_reg6      0x56
 98 #define DW_OP_reg7      0x57
 99 #define DW_OP_reg8      0x58
100 #define DW_OP_reg9      0x59
101 #define DW_OP_reg10     0x5a
102 #define DW_OP_reg11     0x5b
103 #define DW_OP_reg12     0x5c
104 #define DW_OP_reg13     0x5d
105 #define DW_OP_reg14     0x5e
106 #define DW_OP_reg15     0x5f
107 #define DW_OP_reg16     0x60
108 #define DW_OP_reg17     0x61
109 #define DW_OP_reg18     0x62
110 #define DW_OP_reg19     0x63
111 #define DW_OP_reg20     0x64
112 #define DW_OP_reg21     0x65
113 #define DW_OP_reg22     0x66
114 #define DW_OP_reg23     0x67
115 #define DW_OP_reg24     0x68
116 #define DW_OP_reg25     0x69
117 #define DW_OP_reg26     0x6a
118 #define DW_OP_reg27     0x6b
119 #define DW_OP_reg28     0x6c
120 #define DW_OP_reg29     0x6d
121 #define DW_OP_reg30     0x6e
122 #define DW_OP_reg31     0x6f
123 #define DW_OP_breg0     0x70
124 #define DW_OP_breg1     0x71
125 #define DW_OP_breg2     0x72
126 #define DW_OP_breg3     0x73
127 #define DW_OP_breg4     0x74
128 #define DW_OP_breg5     0x75
129 #define DW_OP_breg6     0x76
130 #define DW_OP_breg7     0x77
131 #define DW_OP_breg8     0x78
132 #define DW_OP_breg9     0x79
133 #define DW_OP_breg10    0x7a
134 #define DW_OP_breg11    0x7b
135 #define DW_OP_breg12    0x7c
136 #define DW_OP_breg13    0x7d
137 #define DW_OP_breg14    0x7e
138 #define DW_OP_breg15    0x7f
139 #define DW_OP_breg16    0x80
140 #define DW_OP_breg17    0x81
141 #define DW_OP_breg18    0x82
142 #define DW_OP_breg19    0x83
143 #define DW_OP_breg20    0x84
144 #define DW_OP_breg21    0x85
145 #define DW_OP_breg22    0x86
146 #define DW_OP_breg23    0x87
147 #define DW_OP_breg24    0x88
148 #define DW_OP_breg25    0x89
149 #define DW_OP_breg26    0x8a
150 #define DW_OP_breg27    0x8b
151 #define DW_OP_breg28    0x8c
152 #define DW_OP_breg29    0x8d
153 #define DW_OP_breg30    0x8e
154 #define DW_OP_breg31    0x8f
155 #define DW_OP_regx      0x90
156 #define DW_OP_fbreg     0x91
157 #define DW_OP_bregx     0x92
158 #define DW_OP_piece     0x93
159 #define DW_OP_deref_size        0x94
160 #define DW_OP_xderef_size       0x95
161 #define DW_OP_nop       0x96
162 #define DW_OP_push_object_address       0x97
163 #define DW_OP_call2     0x98
164 #define DW_OP_call4     0x99
165 #define DW_OP_call_ref  0x9a
166 #define DW_OP_form_tls_address  0x9b
167 #define DW_OP_call_frame_cfa    0x9c
168 #define DW_OP_bit_piece 0x9d
169 #define DW_OP_lo_user   0xe0
170 #define DW_OP_hi_user   0xff
171 
172 /*
173  * Addresses used in FDE entries in the .eh_frame section may be encoded
174  * using one of the following encodings.
175  */
176 #define DW_EH_PE_absptr 0x00
177 #define DW_EH_PE_omit   0xff
178 #define DW_EH_PE_uleb128        0x01
179 #define DW_EH_PE_udata2 0x02
180 #define DW_EH_PE_udata4 0x03
181 #define DW_EH_PE_udata8 0x04
182 #define DW_EH_PE_sleb128        0x09
183 #define DW_EH_PE_sdata2 0x0a
184 #define DW_EH_PE_sdata4 0x0b
185 #define DW_EH_PE_sdata8 0x0c
186 #define DW_EH_PE_signed 0x09
187 
188 #define DW_EH_PE_pcrel  0x10
189 
190 /*
191  * The architecture-specific register number that contains the return
192  * address in the .debug_frame table.
193  */
194 #define DWARF_ARCH_RA_REG       17
195 
196 #ifndef __ASSEMBLY__
197 
198 #include <linux/compiler.h>
199 #include <linux/bug.h>
200 #include <linux/list.h>
201 #include <linux/module.h>
202 
203 /*
204  * Read either the frame pointer (r14) or the stack pointer (r15).
205  * NOTE: this MUST be inlined.
206  */
207 static __always_inline unsigned long dwarf_read_arch_reg(unsigned int reg)
208 {
209         unsigned long value = 0;
210 
211         switch (reg) {
212         case 14:
213                 __asm__ __volatile__("mov r14, %0\n" : "=r" (value));
214                 break;
215         case 15:
216                 __asm__ __volatile__("mov r15, %0\n" : "=r" (value));
217                 break;
218         default:
219                 BUG();
220         }
221 
222         return value;
223 }
224 
225 /**
226  *      dwarf_cie - Common Information Entry
227  */
228 struct dwarf_cie {
229         unsigned long length;
230         unsigned long cie_id;
231         unsigned char version;
232         const char *augmentation;
233         unsigned int code_alignment_factor;
234         int data_alignment_factor;
235 
236         /* Which column in the rule table represents return addr of func. */
237         unsigned int return_address_reg;
238 
239         unsigned char *initial_instructions;
240         unsigned char *instructions_end;
241 
242         unsigned char encoding;
243 
244         unsigned long cie_pointer;
245 
246         unsigned long flags;
247 #define DWARF_CIE_Z_AUGMENTATION        (1 << 0)
248 
249         /* linked-list entry if this CIE is from a module */
250         struct list_head link;
251 
252         struct rb_node node;
253 };
254 
255 /**
256  *      dwarf_fde - Frame Description Entry
257  */
258 struct dwarf_fde {
259         unsigned long length;
260         unsigned long cie_pointer;
261         struct dwarf_cie *cie;
262         unsigned long initial_location;
263         unsigned long address_range;
264         unsigned char *instructions;
265         unsigned char *end;
266 
267         /* linked-list entry if this FDE is from a module */
268         struct list_head link;
269 
270         struct rb_node node;
271 };
272 
273 /**
274  *      dwarf_frame - DWARF information for a frame in the call stack
275  */
276 struct dwarf_frame {
277         struct dwarf_frame *prev, *next;
278 
279         unsigned long pc;
280 
281         struct list_head reg_list;
282 
283         unsigned long cfa;
284 
285         /* Valid when DW_FRAME_CFA_REG_OFFSET is set in flags */
286         unsigned int cfa_register;
287         unsigned int cfa_offset;
288 
289         /* Valid when DW_FRAME_CFA_REG_EXP is set in flags */
290         unsigned char *cfa_expr;
291         unsigned int cfa_expr_len;
292 
293         unsigned long flags;
294 #define DWARF_FRAME_CFA_REG_OFFSET      (1 << 0)
295 #define DWARF_FRAME_CFA_REG_EXP         (1 << 1)
296 
297         unsigned long return_addr;
298 };
299 
300 /**
301  *      dwarf_reg - DWARF register
302  *      @flags: Describes how to calculate the value of this register
303  */
304 struct dwarf_reg {
305         struct list_head link;
306 
307         unsigned int number;
308 
309         unsigned long addr;
310         unsigned long flags;
311 #define DWARF_REG_OFFSET        (1 << 0)
312 #define DWARF_VAL_OFFSET        (1 << 1)
313 #define DWARF_UNDEFINED         (1 << 2)
314 };
315 
316 /*
317  * Call Frame instruction opcodes.
318  */
319 #define DW_CFA_advance_loc      0x40
320 #define DW_CFA_offset           0x80
321 #define DW_CFA_restore          0xc0
322 #define DW_CFA_nop              0x00
323 #define DW_CFA_set_loc          0x01
324 #define DW_CFA_advance_loc1     0x02
325 #define DW_CFA_advance_loc2     0x03
326 #define DW_CFA_advance_loc4     0x04
327 #define DW_CFA_offset_extended  0x05
328 #define DW_CFA_restore_extended 0x06
329 #define DW_CFA_undefined        0x07
330 #define DW_CFA_same_value       0x08
331 #define DW_CFA_register         0x09
332 #define DW_CFA_remember_state   0x0a
333 #define DW_CFA_restore_state    0x0b
334 #define DW_CFA_def_cfa          0x0c
335 #define DW_CFA_def_cfa_register 0x0d
336 #define DW_CFA_def_cfa_offset   0x0e
337 #define DW_CFA_def_cfa_expression       0x0f
338 #define DW_CFA_expression       0x10
339 #define DW_CFA_offset_extended_sf       0x11
340 #define DW_CFA_def_cfa_sf       0x12
341 #define DW_CFA_def_cfa_offset_sf        0x13
342 #define DW_CFA_val_offset       0x14
343 #define DW_CFA_val_offset_sf    0x15
344 #define DW_CFA_val_expression   0x16
345 #define DW_CFA_lo_user          0x1c
346 #define DW_CFA_hi_user          0x3f
347 
348 /* GNU extension opcodes  */
349 #define DW_CFA_GNU_args_size    0x2e
350 #define DW_CFA_GNU_negative_offset_extended 0x2f
351 
352 /*
353  * Some call frame instructions encode their operands in the opcode. We
354  * need some helper functions to extract both the opcode and operands
355  * from an instruction.
356  */
357 static inline unsigned int DW_CFA_opcode(unsigned long insn)
358 {
359         return (insn & 0xc0);
360 }
361 
362 static inline unsigned int DW_CFA_operand(unsigned long insn)
363 {
364         return (insn & 0x3f);
365 }
366 
367 #define DW_EH_FRAME_CIE 0               /* .eh_frame CIE IDs are 0 */
368 #define DW_CIE_ID       0xffffffff
369 #define DW64_CIE_ID     0xffffffffffffffffULL
370 
371 /*
372  * DWARF FDE/CIE length field values.
373  */
374 #define DW_EXT_LO       0xfffffff0
375 #define DW_EXT_HI       0xffffffff
376 #define DW_EXT_DWARF64  DW_EXT_HI
377 
378 extern struct dwarf_frame *dwarf_unwind_stack(unsigned long,
379                                               struct dwarf_frame *);
380 extern void dwarf_free_frame(struct dwarf_frame *);
381 
382 extern int module_dwarf_finalize(const Elf_Ehdr *, const Elf_Shdr *,
383                                  struct module *);
384 extern void module_dwarf_cleanup(struct module *);
385 
386 #endif /* !__ASSEMBLY__ */
387 
388 #define CFI_STARTPROC   .cfi_startproc
389 #define CFI_ENDPROC     .cfi_endproc
390 #define CFI_DEF_CFA     .cfi_def_cfa
391 #define CFI_REGISTER    .cfi_register
392 #define CFI_REL_OFFSET  .cfi_rel_offset
393 #define CFI_UNDEFINED   .cfi_undefined
394 
395 #else
396 
397 /*
398  * Use the asm comment character to ignore the rest of the line.
399  */
400 #define CFI_IGNORE      !
401 
402 #define CFI_STARTPROC   CFI_IGNORE
403 #define CFI_ENDPROC     CFI_IGNORE
404 #define CFI_DEF_CFA     CFI_IGNORE
405 #define CFI_REGISTER    CFI_IGNORE
406 #define CFI_REL_OFFSET  CFI_IGNORE
407 #define CFI_UNDEFINED   CFI_IGNORE
408 
409 #ifndef __ASSEMBLY__
410 static inline void dwarf_unwinder_init(void)
411 {
412 }
413 
414 #define module_dwarf_finalize(hdr, sechdrs, me) (0)
415 #define module_dwarf_cleanup(mod)               do { } while (0)
416 
417 #endif
418 
419 #endif /* CONFIG_DWARF_UNWINDER */
420 
421 #endif /* __ASM_SH_DWARF_H */
422 

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