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/arch/sh/include/asm/dwarf.h

http://github.com/mirrors/linux
C Header | 417 lines | 315 code | 50 blank | 52 comment | 2 complexity | ba96c484734998aa9e781d4e2ee1c2c6 MD5 | raw file
  1/* SPDX-License-Identifier: GPL-2.0
  2 *
  3 * Copyright (C) 2009 Matt Fleming <matt@console-pimps.org>
  4 */
  5#ifndef __ASM_SH_DWARF_H
  6#define __ASM_SH_DWARF_H
  7
  8#ifdef CONFIG_DWARF_UNWINDER
  9
 10/*
 11 * DWARF expression operations
 12 */
 13#define DW_OP_addr	0x03
 14#define DW_OP_deref	0x06
 15#define DW_OP_const1u	0x08
 16#define DW_OP_const1s	0x09
 17#define DW_OP_const2u	0x0a
 18#define DW_OP_const2s	0x0b
 19#define DW_OP_const4u	0x0c
 20#define DW_OP_const4s	0x0d
 21#define DW_OP_const8u	0x0e
 22#define DW_OP_const8s	0x0f
 23#define DW_OP_constu	0x10
 24#define DW_OP_consts	0x11
 25#define DW_OP_dup	0x12
 26#define DW_OP_drop	0x13
 27#define DW_OP_over	0x14
 28#define DW_OP_pick	0x15
 29#define DW_OP_swap	0x16
 30#define DW_OP_rot	0x17
 31#define DW_OP_xderef	0x18
 32#define DW_OP_abs	0x19
 33#define DW_OP_and	0x1a
 34#define DW_OP_div	0x1b
 35#define DW_OP_minus	0x1c
 36#define DW_OP_mod	0x1d
 37#define DW_OP_mul	0x1e
 38#define DW_OP_neg	0x1f
 39#define DW_OP_not	0x20
 40#define DW_OP_or	0x21
 41#define DW_OP_plus	0x22
 42#define DW_OP_plus_uconst	0x23
 43#define DW_OP_shl	0x24
 44#define DW_OP_shr	0x25
 45#define DW_OP_shra	0x26
 46#define DW_OP_xor	0x27
 47#define DW_OP_skip	0x2f
 48#define DW_OP_bra	0x28
 49#define DW_OP_eq	0x29
 50#define DW_OP_ge	0x2a
 51#define DW_OP_gt	0x2b
 52#define DW_OP_le	0x2c
 53#define DW_OP_lt	0x2d
 54#define DW_OP_ne	0x2e
 55#define DW_OP_lit0	0x30
 56#define DW_OP_lit1	0x31
 57#define DW_OP_lit2	0x32
 58#define DW_OP_lit3	0x33
 59#define DW_OP_lit4	0x34
 60#define DW_OP_lit5	0x35
 61#define DW_OP_lit6	0x36
 62#define DW_OP_lit7	0x37
 63#define DW_OP_lit8	0x38
 64#define DW_OP_lit9	0x39
 65#define DW_OP_lit10	0x3a
 66#define DW_OP_lit11	0x3b
 67#define DW_OP_lit12	0x3c
 68#define DW_OP_lit13	0x3d
 69#define DW_OP_lit14	0x3e
 70#define DW_OP_lit15	0x3f
 71#define DW_OP_lit16	0x40
 72#define DW_OP_lit17	0x41
 73#define DW_OP_lit18	0x42
 74#define DW_OP_lit19	0x43
 75#define DW_OP_lit20	0x44
 76#define DW_OP_lit21	0x45
 77#define DW_OP_lit22	0x46
 78#define DW_OP_lit23	0x47
 79#define DW_OP_lit24	0x48
 80#define DW_OP_lit25	0x49
 81#define DW_OP_lit26	0x4a
 82#define DW_OP_lit27	0x4b
 83#define DW_OP_lit28	0x4c
 84#define DW_OP_lit29	0x4d
 85#define DW_OP_lit30	0x4e
 86#define DW_OP_lit31	0x4f
 87#define DW_OP_reg0	0x50
 88#define DW_OP_reg1	0x51
 89#define DW_OP_reg2	0x52
 90#define DW_OP_reg3	0x53
 91#define DW_OP_reg4	0x54
 92#define DW_OP_reg5	0x55
 93#define DW_OP_reg6	0x56
 94#define DW_OP_reg7	0x57
 95#define DW_OP_reg8	0x58
 96#define DW_OP_reg9	0x59
 97#define DW_OP_reg10	0x5a
 98#define DW_OP_reg11	0x5b
 99#define DW_OP_reg12	0x5c
100#define DW_OP_reg13	0x5d
101#define DW_OP_reg14	0x5e
102#define DW_OP_reg15	0x5f
103#define DW_OP_reg16	0x60
104#define DW_OP_reg17	0x61
105#define DW_OP_reg18	0x62
106#define DW_OP_reg19	0x63
107#define DW_OP_reg20	0x64
108#define DW_OP_reg21	0x65
109#define DW_OP_reg22	0x66
110#define DW_OP_reg23	0x67
111#define DW_OP_reg24	0x68
112#define DW_OP_reg25	0x69
113#define DW_OP_reg26	0x6a
114#define DW_OP_reg27	0x6b
115#define DW_OP_reg28	0x6c
116#define DW_OP_reg29	0x6d
117#define DW_OP_reg30	0x6e
118#define DW_OP_reg31	0x6f
119#define DW_OP_breg0	0x70
120#define DW_OP_breg1	0x71
121#define DW_OP_breg2	0x72
122#define DW_OP_breg3	0x73
123#define DW_OP_breg4	0x74
124#define DW_OP_breg5	0x75
125#define DW_OP_breg6	0x76
126#define DW_OP_breg7	0x77
127#define DW_OP_breg8	0x78
128#define DW_OP_breg9	0x79
129#define DW_OP_breg10	0x7a
130#define DW_OP_breg11	0x7b
131#define DW_OP_breg12	0x7c
132#define DW_OP_breg13	0x7d
133#define DW_OP_breg14	0x7e
134#define DW_OP_breg15	0x7f
135#define DW_OP_breg16	0x80
136#define DW_OP_breg17	0x81
137#define DW_OP_breg18	0x82
138#define DW_OP_breg19	0x83
139#define DW_OP_breg20	0x84
140#define DW_OP_breg21	0x85
141#define DW_OP_breg22	0x86
142#define DW_OP_breg23	0x87
143#define DW_OP_breg24	0x88
144#define DW_OP_breg25	0x89
145#define DW_OP_breg26	0x8a
146#define DW_OP_breg27	0x8b
147#define DW_OP_breg28	0x8c
148#define DW_OP_breg29	0x8d
149#define DW_OP_breg30	0x8e
150#define DW_OP_breg31	0x8f
151#define DW_OP_regx	0x90
152#define DW_OP_fbreg	0x91
153#define DW_OP_bregx	0x92
154#define DW_OP_piece	0x93
155#define DW_OP_deref_size	0x94
156#define DW_OP_xderef_size	0x95
157#define DW_OP_nop	0x96
158#define DW_OP_push_object_address	0x97
159#define DW_OP_call2	0x98
160#define DW_OP_call4	0x99
161#define DW_OP_call_ref	0x9a
162#define DW_OP_form_tls_address	0x9b
163#define DW_OP_call_frame_cfa	0x9c
164#define DW_OP_bit_piece	0x9d
165#define DW_OP_lo_user	0xe0
166#define DW_OP_hi_user	0xff
167
168/*
169 * Addresses used in FDE entries in the .eh_frame section may be encoded
170 * using one of the following encodings.
171 */
172#define DW_EH_PE_absptr	0x00
173#define DW_EH_PE_omit	0xff
174#define DW_EH_PE_uleb128	0x01
175#define DW_EH_PE_udata2	0x02
176#define DW_EH_PE_udata4	0x03
177#define DW_EH_PE_udata8	0x04
178#define DW_EH_PE_sleb128	0x09
179#define DW_EH_PE_sdata2	0x0a
180#define DW_EH_PE_sdata4	0x0b
181#define DW_EH_PE_sdata8	0x0c
182#define DW_EH_PE_signed	0x09
183
184#define DW_EH_PE_pcrel	0x10
185
186/*
187 * The architecture-specific register number that contains the return
188 * address in the .debug_frame table.
189 */
190#define DWARF_ARCH_RA_REG	17
191
192#ifndef __ASSEMBLY__
193
194#include <linux/compiler.h>
195#include <linux/bug.h>
196#include <linux/list.h>
197#include <linux/module.h>
198
199/*
200 * Read either the frame pointer (r14) or the stack pointer (r15).
201 * NOTE: this MUST be inlined.
202 */
203static __always_inline unsigned long dwarf_read_arch_reg(unsigned int reg)
204{
205	unsigned long value = 0;
206
207	switch (reg) {
208	case 14:
209		__asm__ __volatile__("mov r14, %0\n" : "=r" (value));
210		break;
211	case 15:
212		__asm__ __volatile__("mov r15, %0\n" : "=r" (value));
213		break;
214	default:
215		BUG();
216	}
217
218	return value;
219}
220
221/**
222 *	dwarf_cie - Common Information Entry
223 */
224struct dwarf_cie {
225	unsigned long length;
226	unsigned long cie_id;
227	unsigned char version;
228	const char *augmentation;
229	unsigned int code_alignment_factor;
230	int data_alignment_factor;
231
232	/* Which column in the rule table represents return addr of func. */
233	unsigned int return_address_reg;
234
235	unsigned char *initial_instructions;
236	unsigned char *instructions_end;
237
238	unsigned char encoding;
239
240	unsigned long cie_pointer;
241
242	unsigned long flags;
243#define DWARF_CIE_Z_AUGMENTATION	(1 << 0)
244
245	/* linked-list entry if this CIE is from a module */
246	struct list_head link;
247
248	struct rb_node node;
249};
250
251/**
252 *	dwarf_fde - Frame Description Entry
253 */
254struct dwarf_fde {
255	unsigned long length;
256	unsigned long cie_pointer;
257	struct dwarf_cie *cie;
258	unsigned long initial_location;
259	unsigned long address_range;
260	unsigned char *instructions;
261	unsigned char *end;
262
263	/* linked-list entry if this FDE is from a module */
264	struct list_head link;
265
266	struct rb_node node;
267};
268
269/**
270 *	dwarf_frame - DWARF information for a frame in the call stack
271 */
272struct dwarf_frame {
273	struct dwarf_frame *prev, *next;
274
275	unsigned long pc;
276
277	struct list_head reg_list;
278
279	unsigned long cfa;
280
281	/* Valid when DW_FRAME_CFA_REG_OFFSET is set in flags */
282	unsigned int cfa_register;
283	unsigned int cfa_offset;
284
285	/* Valid when DW_FRAME_CFA_REG_EXP is set in flags */
286	unsigned char *cfa_expr;
287	unsigned int cfa_expr_len;
288
289	unsigned long flags;
290#define DWARF_FRAME_CFA_REG_OFFSET	(1 << 0)
291#define DWARF_FRAME_CFA_REG_EXP		(1 << 1)
292
293	unsigned long return_addr;
294};
295
296/**
297 *	dwarf_reg - DWARF register
298 *	@flags: Describes how to calculate the value of this register
299 */
300struct dwarf_reg {
301	struct list_head link;
302
303	unsigned int number;
304
305	unsigned long addr;
306	unsigned long flags;
307#define DWARF_REG_OFFSET	(1 << 0)
308#define DWARF_VAL_OFFSET	(1 << 1)
309#define DWARF_UNDEFINED		(1 << 2)
310};
311
312/*
313 * Call Frame instruction opcodes.
314 */
315#define DW_CFA_advance_loc	0x40
316#define DW_CFA_offset		0x80
317#define DW_CFA_restore		0xc0
318#define DW_CFA_nop		0x00
319#define DW_CFA_set_loc		0x01
320#define DW_CFA_advance_loc1	0x02
321#define DW_CFA_advance_loc2	0x03
322#define DW_CFA_advance_loc4	0x04
323#define DW_CFA_offset_extended	0x05
324#define DW_CFA_restore_extended	0x06
325#define DW_CFA_undefined	0x07
326#define DW_CFA_same_value	0x08
327#define DW_CFA_register		0x09
328#define DW_CFA_remember_state	0x0a
329#define DW_CFA_restore_state	0x0b
330#define DW_CFA_def_cfa		0x0c
331#define DW_CFA_def_cfa_register	0x0d
332#define DW_CFA_def_cfa_offset	0x0e
333#define DW_CFA_def_cfa_expression	0x0f
334#define DW_CFA_expression	0x10
335#define DW_CFA_offset_extended_sf	0x11
336#define DW_CFA_def_cfa_sf	0x12
337#define DW_CFA_def_cfa_offset_sf	0x13
338#define DW_CFA_val_offset	0x14
339#define DW_CFA_val_offset_sf	0x15
340#define DW_CFA_val_expression	0x16
341#define DW_CFA_lo_user		0x1c
342#define DW_CFA_hi_user		0x3f
343
344/* GNU extension opcodes  */
345#define DW_CFA_GNU_args_size	0x2e
346#define DW_CFA_GNU_negative_offset_extended 0x2f
347
348/*
349 * Some call frame instructions encode their operands in the opcode. We
350 * need some helper functions to extract both the opcode and operands
351 * from an instruction.
352 */
353static inline unsigned int DW_CFA_opcode(unsigned long insn)
354{
355	return (insn & 0xc0);
356}
357
358static inline unsigned int DW_CFA_operand(unsigned long insn)
359{
360	return (insn & 0x3f);
361}
362
363#define DW_EH_FRAME_CIE	0		/* .eh_frame CIE IDs are 0 */
364#define DW_CIE_ID	0xffffffff
365#define DW64_CIE_ID	0xffffffffffffffffULL
366
367/*
368 * DWARF FDE/CIE length field values.
369 */
370#define DW_EXT_LO	0xfffffff0
371#define DW_EXT_HI	0xffffffff
372#define DW_EXT_DWARF64	DW_EXT_HI
373
374extern struct dwarf_frame *dwarf_unwind_stack(unsigned long,
375					      struct dwarf_frame *);
376extern void dwarf_free_frame(struct dwarf_frame *);
377
378extern int module_dwarf_finalize(const Elf_Ehdr *, const Elf_Shdr *,
379				 struct module *);
380extern void module_dwarf_cleanup(struct module *);
381
382#endif /* !__ASSEMBLY__ */
383
384#define CFI_STARTPROC	.cfi_startproc
385#define CFI_ENDPROC	.cfi_endproc
386#define CFI_DEF_CFA	.cfi_def_cfa
387#define CFI_REGISTER	.cfi_register
388#define CFI_REL_OFFSET	.cfi_rel_offset
389#define CFI_UNDEFINED	.cfi_undefined
390
391#else
392
393/*
394 * Use the asm comment character to ignore the rest of the line.
395 */
396#define CFI_IGNORE	!
397
398#define CFI_STARTPROC	CFI_IGNORE
399#define CFI_ENDPROC	CFI_IGNORE
400#define CFI_DEF_CFA	CFI_IGNORE
401#define CFI_REGISTER	CFI_IGNORE
402#define CFI_REL_OFFSET	CFI_IGNORE
403#define CFI_UNDEFINED	CFI_IGNORE
404
405#ifndef __ASSEMBLY__
406static inline void dwarf_unwinder_init(void)
407{
408}
409
410#define module_dwarf_finalize(hdr, sechdrs, me)	(0)
411#define module_dwarf_cleanup(mod)		do { } while (0)
412
413#endif
414
415#endif /* CONFIG_DWARF_UNWINDER */
416
417#endif /* __ASM_SH_DWARF_H */