1 /* Common target dependent code for GDB on ARM systems.
2 Copyright (C) 2002-2021 Free Software Foundation, Inc.
4 This file is part of GDB.
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
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
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.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
22 /* Forward declarations. */
26 struct arm_get_next_pcs
;
27 struct gdb_get_next_pcs
;
29 /* Set to true if the 32-bit mode is in use. */
31 extern bool arm_apcs_32
;
39 /* Number of machine registers. The only define actually required
40 is gdbarch_num_regs. The other definitions are used for documentation
41 purposes and code readability. */
42 /* For 26 bit ARM code, a fake copy of the PC is placed in register 25 (PS)
43 (and called PS for processor status) so the status bits can be cleared
44 from the PC (register 15). For 32 bit ARM code, a copy of CPSR is placed
46 #define NUM_FREGS 8 /* Number of floating point registers. */
47 #define NUM_SREGS 2 /* Number of status registers. */
48 #define NUM_GREGS 16 /* Number of general purpose registers. */
52 /* Type of floating-point code in use by inferior. There are really 3 models
53 that are traditionally supported (plus the endianness issue), but gcc can
54 only generate 2 of those. The third is APCS_FLOAT, where arguments to
55 functions are passed in floating-point registers.
57 In addition to the traditional models, VFP adds two more.
59 If you update this enum, don't forget to update fp_model_strings in
64 ARM_FLOAT_AUTO
, /* Automatic detection. Do not set in tdep. */
65 ARM_FLOAT_SOFT_FPA
, /* Traditional soft-float (mixed-endian on LE ARM). */
66 ARM_FLOAT_FPA
, /* FPA co-processor. GCC calling convention. */
67 ARM_FLOAT_SOFT_VFP
, /* Soft-float with pure-endian doubles. */
68 ARM_FLOAT_VFP
, /* Full VFP calling convention. */
69 ARM_FLOAT_LAST
/* Keep at end. */
72 /* ABI used by the inferior. */
81 /* Convention for returning structures. */
85 pcc_struct_return
, /* Return "short" structures in memory. */
86 reg_struct_return
/* Return "short" structures in registers. */
89 /* Target-dependent structure in gdbarch. */
90 struct arm_gdbarch_tdep
: gdbarch_tdep
92 /* The ABI for this architecture. It should never be set to
94 enum arm_abi_kind arm_abi
{};
96 enum arm_float_model fp_model
{}; /* Floating point calling conventions. */
98 bool have_fpa_registers
= false; /* Does the target report the FPA registers? */
99 bool have_wmmx_registers
= false; /* Does the target report the WMMX registers? */
100 /* The number of VFP registers reported by the target. It is zero
101 if VFP registers are not supported. */
102 int vfp_register_count
= 0;
103 bool have_s_pseudos
= false; /* Are we synthesizing the single precision
105 int s_pseudo_base
= 0; /* Register number for the first S pseudo
107 int s_pseudo_count
= 0; /* Number of S pseudo registers. */
108 bool have_q_pseudos
= false; /* Are we synthesizing the quad precision
109 Q (NEON or MVE) registers? Requires
111 int q_pseudo_base
= 0; /* Register number for the first quad
112 precision pseudo register. */
113 int q_pseudo_count
= 0; /* Number of quad precision pseudo
115 bool have_neon
= false; /* Do we have a NEON unit? */
117 bool have_mve
= false; /* Do we have a MVE extension? */
118 int mve_vpr_regnum
= 0; /* MVE VPR register number. */
119 int mve_pseudo_base
= 0; /* Number of the first MVE pseudo register. */
120 int mve_pseudo_count
= 0; /* Total number of MVE pseudo registers. */
122 bool is_m
= false; /* Does the target follow the "M" profile. */
123 CORE_ADDR lowest_pc
= 0; /* Lowest address at which instructions
126 const gdb_byte
*arm_breakpoint
= nullptr; /* Breakpoint pattern for an ARM insn. */
127 int arm_breakpoint_size
= 0; /* And its size. */
128 const gdb_byte
*thumb_breakpoint
= nullptr; /* Breakpoint pattern for a Thumb insn. */
129 int thumb_breakpoint_size
= 0; /* And its size. */
131 /* If the Thumb breakpoint is an undefined instruction (which is
132 affected by IT blocks) rather than a BKPT instruction (which is
133 not), then we need a 32-bit Thumb breakpoint to preserve the
134 instruction count in IT blocks. */
135 const gdb_byte
*thumb2_breakpoint
= nullptr;
136 int thumb2_breakpoint_size
= 0;
138 int jb_pc
= 0; /* Offset to PC value in jump buffer.
139 If this is negative, longjmp support
141 size_t jb_elt_size
= 0; /* And the size of each entry in the buf. */
143 /* Convention for returning structures. */
144 enum struct_return struct_return
{};
146 /* ISA-specific data types. */
147 struct type
*arm_ext_type
= nullptr;
148 struct type
*neon_double_type
= nullptr;
149 struct type
*neon_quad_type
= nullptr;
151 /* syscall record. */
152 int (*arm_syscall_record
) (struct regcache
*regcache
,
153 unsigned long svc_number
) = nullptr;
156 /* Structures used for displaced stepping. */
158 /* The maximum number of temporaries available for displaced instructions. */
159 #define DISPLACED_TEMPS 16
160 /* The maximum number of modified instructions generated for one single-stepped
161 instruction, including the breakpoint (usually at the end of the instruction
162 sequence) and any scratch words, etc. */
163 #define ARM_DISPLACED_MODIFIED_INSNS 8
165 struct arm_displaced_step_copy_insn_closure
166 : public displaced_step_copy_insn_closure
168 ULONGEST tmp
[DISPLACED_TEMPS
];
176 int rn
; /* Writeback register. */
177 unsigned int immed
: 1; /* Offset is immediate. */
178 unsigned int writeback
: 1; /* Perform base-register writeback. */
179 unsigned int restore_r4
: 1; /* Used r4 as scratch. */
185 unsigned int link
: 1;
186 unsigned int exchange
: 1;
187 unsigned int cond
: 4;
192 unsigned int regmask
;
195 unsigned int load
: 1;
196 unsigned int user
: 1;
197 unsigned int increment
: 1;
198 unsigned int before
: 1;
199 unsigned int writeback
: 1;
200 unsigned int cond
: 4;
205 unsigned int immed
: 1;
210 /* If non-NULL, override generic SVC handling (e.g. for a particular
212 int (*copy_svc_os
) (struct gdbarch
*gdbarch
, struct regcache
*regs
,
213 arm_displaced_step_copy_insn_closure
*dsc
);
217 /* The size of original instruction, 2 or 4. */
218 unsigned int insn_size
;
219 /* True if the original insn (and thus all replacement insns) are Thumb
221 unsigned int is_thumb
;
223 /* The slots in the array is used in this way below,
224 - ARM instruction occupies one slot,
225 - Thumb 16 bit instruction occupies one slot,
226 - Thumb 32-bit instruction occupies *two* slots, one part for each. */
227 unsigned long modinsn
[ARM_DISPLACED_MODIFIED_INSNS
];
230 CORE_ADDR scratch_base
;
231 void (*cleanup
) (struct gdbarch
*, struct regcache
*,
232 arm_displaced_step_copy_insn_closure
*);
235 /* Values for the WRITE_PC argument to displaced_write_reg. If the register
236 write may write to the PC, specifies the way the CPSR T bit, etc. is
237 modified by the instruction. */
249 arm_process_displaced_insn (struct gdbarch
*gdbarch
, CORE_ADDR from
,
250 CORE_ADDR to
, struct regcache
*regs
,
251 arm_displaced_step_copy_insn_closure
*dsc
);
253 arm_displaced_init_closure (struct gdbarch
*gdbarch
, CORE_ADDR from
,
255 arm_displaced_step_copy_insn_closure
*dsc
);
257 displaced_read_reg (regcache
*regs
, arm_displaced_step_copy_insn_closure
*dsc
,
260 displaced_write_reg (struct regcache
*regs
,
261 arm_displaced_step_copy_insn_closure
*dsc
, int regno
,
262 ULONGEST val
, enum pc_write_style write_pc
);
264 CORE_ADDR
arm_skip_stub (struct frame_info
*, CORE_ADDR
);
266 ULONGEST
arm_get_next_pcs_read_memory_unsigned_integer (CORE_ADDR memaddr
,
270 CORE_ADDR
arm_get_next_pcs_addr_bits_remove (struct arm_get_next_pcs
*self
,
273 int arm_get_next_pcs_is_thumb (struct arm_get_next_pcs
*self
);
275 std::vector
<CORE_ADDR
> arm_software_single_step (struct regcache
*);
276 int arm_is_thumb (struct regcache
*regcache
);
277 int arm_frame_is_thumb (struct frame_info
*frame
);
279 extern void arm_displaced_step_fixup (struct gdbarch
*,
280 displaced_step_copy_insn_closure
*,
281 CORE_ADDR
, CORE_ADDR
, struct regcache
*);
283 /* Return the bit mask in ARM_PS_REGNUM that indicates Thumb mode. */
284 extern int arm_psr_thumb_bit (struct gdbarch
*);
286 /* Is the instruction at the given memory address a Thumb or ARM
288 extern int arm_pc_is_thumb (struct gdbarch
*, CORE_ADDR
);
290 extern int arm_process_record (struct gdbarch
*gdbarch
,
291 struct regcache
*regcache
, CORE_ADDR addr
);
292 /* Functions exported from arm-bsd-tdep.h. */
294 /* Return the appropriate register set for the core section identified
295 by SECT_NAME and SECT_SIZE. */
298 armbsd_iterate_over_regset_sections (struct gdbarch
*gdbarch
,
299 iterate_over_regset_sections_cb
*cb
,
301 const struct regcache
*regcache
);
303 /* Get the correct Arm target description with given FP hardware type. */
304 const target_desc
*arm_read_description (arm_fp_type fp_type
);
306 /* Get the correct Arm M-Profile target description with given hardware
308 const target_desc
*arm_read_mprofile_description (arm_m_profile_type m_type
);
310 #endif /* arm-tdep.h */