1 /* Common target dependent code for GDB on ARM systems.
2 Copyright (C) 2002-2023 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_base
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 have_pacbti
= false; /* True if we have the ARMv8.1-m PACBTI
124 int pacbti_pseudo_base
= 0; /* Number of the first PACBTI pseudo
126 int pacbti_pseudo_count
= 0; /* Total number of PACBTI pseudo registers. */
128 int m_profile_msp_regnum
= ARM_SP_REGNUM
; /* M-profile MSP register number. */
129 int m_profile_psp_regnum
= ARM_SP_REGNUM
; /* M-profile PSP register number. */
131 /* Secure and Non-secure stack pointers with security extension. */
132 int m_profile_msp_ns_regnum
= ARM_SP_REGNUM
; /* M-profile MSP_NS register number. */
133 int m_profile_psp_ns_regnum
= ARM_SP_REGNUM
; /* M-profile PSP_NS register number. */
134 int m_profile_msp_s_regnum
= ARM_SP_REGNUM
; /* M-profile MSP_S register number. */
135 int m_profile_psp_s_regnum
= ARM_SP_REGNUM
; /* M-profile PSP_S register number. */
137 int tls_regnum
= 0; /* Number of the tpidruro register. */
139 bool is_m
= false; /* Does the target follow the "M" profile. */
140 bool have_sec_ext
= false; /* Do we have security extensions? */
141 CORE_ADDR lowest_pc
= 0; /* Lowest address at which instructions
144 const gdb_byte
*arm_breakpoint
= nullptr; /* Breakpoint pattern for an ARM insn. */
145 int arm_breakpoint_size
= 0; /* And its size. */
146 const gdb_byte
*thumb_breakpoint
= nullptr; /* Breakpoint pattern for a Thumb insn. */
147 int thumb_breakpoint_size
= 0; /* And its size. */
149 /* If the Thumb breakpoint is an undefined instruction (which is
150 affected by IT blocks) rather than a BKPT instruction (which is
151 not), then we need a 32-bit Thumb breakpoint to preserve the
152 instruction count in IT blocks. */
153 const gdb_byte
*thumb2_breakpoint
= nullptr;
154 int thumb2_breakpoint_size
= 0;
156 int jb_pc
= 0; /* Offset to PC value in jump buffer.
157 If this is negative, longjmp support
159 size_t jb_elt_size
= 0; /* And the size of each entry in the buf. */
161 /* Convention for returning structures. */
162 enum struct_return struct_return
{};
164 /* ISA-specific data types. */
165 struct type
*arm_ext_type
= nullptr;
166 struct type
*neon_double_type
= nullptr;
167 struct type
*neon_quad_type
= nullptr;
169 /* syscall record. */
170 int (*arm_syscall_record
) (struct regcache
*regcache
,
171 unsigned long svc_number
) = nullptr;
174 /* Structures used for displaced stepping. */
176 /* The maximum number of temporaries available for displaced instructions. */
177 #define DISPLACED_TEMPS 16
178 /* The maximum number of modified instructions generated for one single-stepped
179 instruction, including the breakpoint (usually at the end of the instruction
180 sequence) and any scratch words, etc. */
181 #define ARM_DISPLACED_MODIFIED_INSNS 8
183 struct arm_displaced_step_copy_insn_closure
184 : public displaced_step_copy_insn_closure
186 ULONGEST tmp
[DISPLACED_TEMPS
];
194 int rn
; /* Writeback register. */
195 unsigned int immed
: 1; /* Offset is immediate. */
196 unsigned int writeback
: 1; /* Perform base-register writeback. */
197 unsigned int restore_r4
: 1; /* Used r4 as scratch. */
203 unsigned int link
: 1;
204 unsigned int exchange
: 1;
205 unsigned int cond
: 4;
210 unsigned int regmask
;
213 unsigned int load
: 1;
214 unsigned int user
: 1;
215 unsigned int increment
: 1;
216 unsigned int before
: 1;
217 unsigned int writeback
: 1;
218 unsigned int cond
: 4;
223 unsigned int immed
: 1;
228 /* If non-NULL, override generic SVC handling (e.g. for a particular
230 int (*copy_svc_os
) (struct gdbarch
*gdbarch
, struct regcache
*regs
,
231 arm_displaced_step_copy_insn_closure
*dsc
);
235 /* The size of original instruction, 2 or 4. */
236 unsigned int insn_size
;
237 /* True if the original insn (and thus all replacement insns) are Thumb
239 unsigned int is_thumb
;
241 /* The slots in the array is used in this way below,
242 - ARM instruction occupies one slot,
243 - Thumb 16 bit instruction occupies one slot,
244 - Thumb 32-bit instruction occupies *two* slots, one part for each. */
245 unsigned long modinsn
[ARM_DISPLACED_MODIFIED_INSNS
];
248 CORE_ADDR scratch_base
;
249 void (*cleanup
) (struct gdbarch
*, struct regcache
*,
250 arm_displaced_step_copy_insn_closure
*);
253 /* Values for the WRITE_PC argument to displaced_write_reg. If the register
254 write may write to the PC, specifies the way the CPSR T bit, etc. is
255 modified by the instruction. */
267 arm_process_displaced_insn (struct gdbarch
*gdbarch
, CORE_ADDR from
,
268 CORE_ADDR to
, struct regcache
*regs
,
269 arm_displaced_step_copy_insn_closure
*dsc
);
271 arm_displaced_init_closure (struct gdbarch
*gdbarch
, CORE_ADDR from
,
273 arm_displaced_step_copy_insn_closure
*dsc
);
275 displaced_read_reg (regcache
*regs
, arm_displaced_step_copy_insn_closure
*dsc
,
278 displaced_write_reg (struct regcache
*regs
,
279 arm_displaced_step_copy_insn_closure
*dsc
, int regno
,
280 ULONGEST val
, enum pc_write_style write_pc
);
282 CORE_ADDR
arm_skip_stub (frame_info_ptr
, CORE_ADDR
);
284 ULONGEST
arm_get_next_pcs_read_memory_unsigned_integer (CORE_ADDR memaddr
,
288 CORE_ADDR
arm_get_next_pcs_addr_bits_remove (struct arm_get_next_pcs
*self
,
291 int arm_get_next_pcs_is_thumb (struct arm_get_next_pcs
*self
);
293 std::vector
<CORE_ADDR
> arm_software_single_step (struct regcache
*);
294 int arm_is_thumb (struct regcache
*regcache
);
295 int arm_frame_is_thumb (frame_info_ptr frame
);
297 extern void arm_displaced_step_fixup (struct gdbarch
*,
298 displaced_step_copy_insn_closure
*,
299 CORE_ADDR
, CORE_ADDR
, struct regcache
*);
301 /* Return the bit mask in ARM_PS_REGNUM that indicates Thumb mode. */
302 extern int arm_psr_thumb_bit (struct gdbarch
*);
304 /* Is the instruction at the given memory address a Thumb or ARM
306 extern int arm_pc_is_thumb (struct gdbarch
*, CORE_ADDR
);
308 extern int arm_process_record (struct gdbarch
*gdbarch
,
309 struct regcache
*regcache
, CORE_ADDR addr
);
310 /* Functions exported from arm-bsd-tdep.h. */
312 /* Return the appropriate register set for the core section identified
313 by SECT_NAME and SECT_SIZE. */
316 armbsd_iterate_over_regset_sections (struct gdbarch
*gdbarch
,
317 iterate_over_regset_sections_cb
*cb
,
319 const struct regcache
*regcache
);
321 /* Get the correct Arm target description with given FP hardware type. */
322 const target_desc
*arm_read_description (arm_fp_type fp_type
, bool tls
);
324 /* Get the correct Arm M-Profile target description with given hardware
326 const target_desc
*arm_read_mprofile_description (arm_m_profile_type m_type
);
328 #endif /* arm-tdep.h */