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34e8f22d 1/* Common target dependent code for GDB on ARM systems.
42a4f53d 2 Copyright (C) 2002-2019 Free Software Foundation, Inc.
34e8f22d
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3
4 This file is part of GDB.
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
a9762ec7 8 the Free Software Foundation; either version 3 of the License, or
34e8f22d
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9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
a9762ec7 17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
34e8f22d 18
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19#ifndef ARM_TDEP_H
20#define ARM_TDEP_H
21
cb587d83 22/* Forward declarations. */
47ccd048 23struct gdbarch;
cb587d83 24struct regset;
3352110b 25struct address_space;
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26struct get_next_pcs;
27struct arm_get_next_pcs;
28struct gdb_get_next_pcs;
cb587d83 29
ec741292 30#include "arch/arm.h"
cfba9872 31#include "infrun.h"
34e8f22d 32
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33#include <vector>
34
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35/* Say how long FP registers are. Used for documentation purposes and
36 code readability in this header. IEEE extended doubles are 80
37 bits. DWORD aligned they use 96 bits. */
7a5ea0d4 38#define FP_REGISTER_SIZE 12
34e8f22d 39
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40/* Say how long VFP double precision registers are. Used for documentation
41 purposes and code readability. These are fixed at 64 bits. */
42#define VFP_REGISTER_SIZE 8
43
34e8f22d 44/* Number of machine registers. The only define actually required
f57d151a 45 is gdbarch_num_regs. The other definitions are used for documentation
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46 purposes and code readability. */
47/* For 26 bit ARM code, a fake copy of the PC is placed in register 25 (PS)
48 (and called PS for processor status) so the status bits can be cleared
49 from the PC (register 15). For 32 bit ARM code, a copy of CPSR is placed
50 in PS. */
51#define NUM_FREGS 8 /* Number of floating point registers. */
52#define NUM_SREGS 2 /* Number of status registers. */
53#define NUM_GREGS 16 /* Number of general purpose registers. */
54
55
9779414d 56
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57/* Type of floating-point code in use by inferior. There are really 3 models
58 that are traditionally supported (plus the endianness issue), but gcc can
59 only generate 2 of those. The third is APCS_FLOAT, where arguments to
60 functions are passed in floating-point registers.
61
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62 In addition to the traditional models, VFP adds two more.
63
64 If you update this enum, don't forget to update fp_model_strings in
65 arm-tdep.c. */
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66
67enum arm_float_model
68{
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69 ARM_FLOAT_AUTO, /* Automatic detection. Do not set in tdep. */
70 ARM_FLOAT_SOFT_FPA, /* Traditional soft-float (mixed-endian on LE ARM). */
71 ARM_FLOAT_FPA, /* FPA co-processor. GCC calling convention. */
72 ARM_FLOAT_SOFT_VFP, /* Soft-float with pure-endian doubles. */
73 ARM_FLOAT_VFP, /* Full VFP calling convention. */
74 ARM_FLOAT_LAST /* Keep at end. */
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75};
76
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77/* ABI used by the inferior. */
78enum arm_abi_kind
79{
80 ARM_ABI_AUTO,
81 ARM_ABI_APCS,
82 ARM_ABI_AAPCS,
83 ARM_ABI_LAST
84};
fd50bc42 85
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86/* Convention for returning structures. */
87
88enum struct_return
89{
90 pcc_struct_return, /* Return "short" structures in memory. */
91 reg_struct_return /* Return "short" structures in registers. */
92};
93
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94/* Target-dependent structure in gdbarch. */
95struct gdbarch_tdep
96{
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97 /* The ABI for this architecture. It should never be set to
98 ARM_ABI_AUTO. */
99 enum arm_abi_kind arm_abi;
100
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101 enum arm_float_model fp_model; /* Floating point calling conventions. */
102
ff6f572f 103 int have_fpa_registers; /* Does the target report the FPA registers? */
a56cc1ce 104 int have_wmmx_registers; /* Does the target report the WMMX registers? */
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105 /* The number of VFP registers reported by the target. It is zero
106 if VFP registers are not supported. */
107 int vfp_register_count;
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108 int have_vfp_pseudos; /* Are we synthesizing the single precision
109 VFP registers? */
110 int have_neon_pseudos; /* Are we synthesizing the quad precision
111 NEON registers? Requires
112 have_vfp_pseudos. */
113 int have_neon; /* Do we have a NEON unit? */
ff6f572f 114
9779414d 115 int is_m; /* Does the target follow the "M" profile. */
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116 CORE_ADDR lowest_pc; /* Lowest address at which instructions
117 will appear. */
9df628e0 118
948f8e3d 119 const gdb_byte *arm_breakpoint; /* Breakpoint pattern for an ARM insn. */
9df628e0 120 int arm_breakpoint_size; /* And its size. */
948f8e3d 121 const gdb_byte *thumb_breakpoint; /* Breakpoint pattern for a Thumb insn. */
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122 int thumb_breakpoint_size; /* And its size. */
123
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124 /* If the Thumb breakpoint is an undefined instruction (which is
125 affected by IT blocks) rather than a BKPT instruction (which is
126 not), then we need a 32-bit Thumb breakpoint to preserve the
127 instruction count in IT blocks. */
948f8e3d 128 const gdb_byte *thumb2_breakpoint;
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129 int thumb2_breakpoint_size;
130
0963b4bd 131 int jb_pc; /* Offset to PC value in jump buffer.
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132 If this is negative, longjmp support
133 will be disabled. */
134 size_t jb_elt_size; /* And the size of each entry in the buf. */
cb587d83 135
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136 /* Convention for returning structures. */
137 enum struct_return struct_return;
138
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139 /* ISA-specific data types. */
140 struct type *arm_ext_type;
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141 struct type *neon_double_type;
142 struct type *neon_quad_type;
25b41d01 143
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144 /* syscall record. */
145 int (*arm_syscall_record) (struct regcache *regcache, unsigned long svc_number);
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146};
147
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148/* Structures used for displaced stepping. */
149
150/* The maximum number of temporaries available for displaced instructions. */
151#define DISPLACED_TEMPS 16
152/* The maximum number of modified instructions generated for one single-stepped
153 instruction, including the breakpoint (usually at the end of the instruction
154 sequence) and any scratch words, etc. */
155#define DISPLACED_MODIFIED_INSNS 8
156
cfba9872 157struct arm_displaced_step_closure : public displaced_step_closure
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158{
159 ULONGEST tmp[DISPLACED_TEMPS];
160 int rd;
161 int wrote_to_pc;
162 union
163 {
164 struct
165 {
166 int xfersize;
167 int rn; /* Writeback register. */
168 unsigned int immed : 1; /* Offset is immediate. */
169 unsigned int writeback : 1; /* Perform base-register writeback. */
170 unsigned int restore_r4 : 1; /* Used r4 as scratch. */
171 } ldst;
172
173 struct
174 {
175 unsigned long dest;
176 unsigned int link : 1;
177 unsigned int exchange : 1;
178 unsigned int cond : 4;
179 } branch;
180
181 struct
182 {
183 unsigned int regmask;
184 int rn;
185 CORE_ADDR xfer_addr;
186 unsigned int load : 1;
187 unsigned int user : 1;
188 unsigned int increment : 1;
189 unsigned int before : 1;
190 unsigned int writeback : 1;
191 unsigned int cond : 4;
192 } block;
193
194 struct
195 {
196 unsigned int immed : 1;
197 } preload;
198
199 struct
200 {
201 /* If non-NULL, override generic SVC handling (e.g. for a particular
202 OS). */
bd18283a 203 int (*copy_svc_os) (struct gdbarch *gdbarch, struct regcache *regs,
cfba9872 204 arm_displaced_step_closure *dsc);
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JB
205 } svc;
206 } u;
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207
208 /* The size of original instruction, 2 or 4. */
209 unsigned int insn_size;
210 /* True if the original insn (and thus all replacement insns) are Thumb
211 instead of ARM. */
212 unsigned int is_thumb;
213
214 /* The slots in the array is used in this way below,
215 - ARM instruction occupies one slot,
216 - Thumb 16 bit instruction occupies one slot,
217 - Thumb 32-bit instruction occupies *two* slots, one part for each. */
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218 unsigned long modinsn[DISPLACED_MODIFIED_INSNS];
219 int numinsns;
220 CORE_ADDR insn_addr;
221 CORE_ADDR scratch_base;
222 void (*cleanup) (struct gdbarch *, struct regcache *,
cfba9872 223 arm_displaced_step_closure *);
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224};
225
226/* Values for the WRITE_PC argument to displaced_write_reg. If the register
227 write may write to the PC, specifies the way the CPSR T bit, etc. is
228 modified by the instruction. */
229
230enum pc_write_style
231{
232 BRANCH_WRITE_PC,
233 BX_WRITE_PC,
234 LOAD_WRITE_PC,
235 ALU_WRITE_PC,
236 CANNOT_WRITE_PC
237};
238
239extern void
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240 arm_process_displaced_insn (struct gdbarch *gdbarch, CORE_ADDR from,
241 CORE_ADDR to, struct regcache *regs,
cfba9872 242 arm_displaced_step_closure *dsc);
cca44b1b
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243extern void
244 arm_displaced_init_closure (struct gdbarch *gdbarch, CORE_ADDR from,
cfba9872 245 CORE_ADDR to, arm_displaced_step_closure *dsc);
cca44b1b 246extern ULONGEST
cfba9872 247 displaced_read_reg (struct regcache *regs, arm_displaced_step_closure *dsc,
36073a92 248 int regno);
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249extern void
250 displaced_write_reg (struct regcache *regs,
cfba9872 251 arm_displaced_step_closure *dsc, int regno,
cca44b1b 252 ULONGEST val, enum pc_write_style write_pc);
7c00367c 253
6dc13412 254CORE_ADDR arm_skip_stub (struct frame_info *, CORE_ADDR);
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255
256ULONGEST arm_get_next_pcs_read_memory_unsigned_integer (CORE_ADDR memaddr,
257 int len,
258 int byte_order);
259
260CORE_ADDR arm_get_next_pcs_addr_bits_remove (struct arm_get_next_pcs *self,
261 CORE_ADDR val);
262
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263int arm_get_next_pcs_is_thumb (struct arm_get_next_pcs *self);
264
a0ff9e1a 265std::vector<CORE_ADDR> arm_software_single_step (struct regcache *);
d0e59a68 266int arm_is_thumb (struct regcache *regcache);
25b41d01 267int arm_frame_is_thumb (struct frame_info *frame);
190dce09 268
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269extern void arm_displaced_step_fixup (struct gdbarch *,
270 struct displaced_step_closure *,
271 CORE_ADDR, CORE_ADDR, struct regcache *);
272
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UW
273/* Return the bit mask in ARM_PS_REGNUM that indicates Thumb mode. */
274extern int arm_psr_thumb_bit (struct gdbarch *);
275
e3039479
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276/* Is the instruction at the given memory address a Thumb or ARM
277 instruction? */
278extern int arm_pc_is_thumb (struct gdbarch *, CORE_ADDR);
279
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280extern int arm_process_record (struct gdbarch *gdbarch,
281 struct regcache *regcache, CORE_ADDR addr);
03b62bbb 282/* Functions exported from arm-bsd-tdep.h. */
47ccd048
MK
283
284/* Return the appropriate register set for the core section identified
285 by SECT_NAME and SECT_SIZE. */
286
ed09174e
AA
287extern void
288 armbsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
289 iterate_over_regset_sections_cb *cb,
290 void *cb_data,
291 const struct regcache *regcache);
47ccd048 292
ef7e8358
UW
293/* Target descriptions. */
294extern struct target_desc *tdesc_arm_with_m;
295extern struct target_desc *tdesc_arm_with_iwmmxt;
296extern struct target_desc *tdesc_arm_with_vfpv2;
297extern struct target_desc *tdesc_arm_with_vfpv3;
298extern struct target_desc *tdesc_arm_with_neon;
299
47ccd048 300#endif /* arm-tdep.h */