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06ab9219 TT |
1 | /* Target-dependent header for the RISC-V architecture, for GDB, the |
2 | GNU Debugger. | |
dbbb1059 | 3 | |
3666a048 | 4 | Copyright (C) 2018-2021 Free Software Foundation, Inc. |
dbbb1059 | 5 | |
dbbb1059 AB |
6 | This file is part of GDB. |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 3 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
20 | ||
21 | #ifndef RISCV_TDEP_H | |
22 | #define RISCV_TDEP_H | |
23 | ||
b5ffee31 AB |
24 | #include "arch/riscv.h" |
25 | ||
dbbb1059 AB |
26 | /* RiscV register numbers. */ |
27 | enum | |
28 | { | |
29 | RISCV_ZERO_REGNUM = 0, /* Read-only register, always 0. */ | |
30 | RISCV_RA_REGNUM = 1, /* Return Address. */ | |
31 | RISCV_SP_REGNUM = 2, /* Stack Pointer. */ | |
32 | RISCV_GP_REGNUM = 3, /* Global Pointer. */ | |
33 | RISCV_TP_REGNUM = 4, /* Thread Pointer. */ | |
34 | RISCV_FP_REGNUM = 8, /* Frame Pointer. */ | |
35 | RISCV_A0_REGNUM = 10, /* First argument. */ | |
36 | RISCV_A1_REGNUM = 11, /* Second argument. */ | |
37 | RISCV_PC_REGNUM = 32, /* Program Counter. */ | |
38 | ||
78a3b0fa AB |
39 | RISCV_NUM_INTEGER_REGS = 32, |
40 | ||
dbbb1059 AB |
41 | RISCV_FIRST_FP_REGNUM = 33, /* First Floating Point Register */ |
42 | RISCV_FA0_REGNUM = 43, | |
43 | RISCV_FA1_REGNUM = RISCV_FA0_REGNUM + 1, | |
44 | RISCV_LAST_FP_REGNUM = 64, /* Last Floating Point Register */ | |
45 | ||
46 | RISCV_FIRST_CSR_REGNUM = 65, /* First CSR */ | |
8f595e9b | 47 | #define DECLARE_CSR(name, num, class, define_version, abort_version) \ |
06ab9219 | 48 | RISCV_ ## num ## _REGNUM = RISCV_FIRST_CSR_REGNUM + num, |
dbbb1059 AB |
49 | #include "opcode/riscv-opc.h" |
50 | #undef DECLARE_CSR | |
51 | RISCV_LAST_CSR_REGNUM = 4160, | |
ce73f310 | 52 | RISCV_CSR_LEGACY_MISA_REGNUM = 0xf10 + RISCV_FIRST_CSR_REGNUM, |
dbbb1059 AB |
53 | |
54 | RISCV_PRIV_REGNUM = 4161, | |
55 | ||
56 | RISCV_LAST_REGNUM = RISCV_PRIV_REGNUM | |
57 | }; | |
58 | ||
fb44d95a AB |
59 | /* RiscV DWARF register numbers. */ |
60 | enum | |
61 | { | |
62 | RISCV_DWARF_REGNUM_X0 = 0, | |
63 | RISCV_DWARF_REGNUM_X31 = 31, | |
64 | RISCV_DWARF_REGNUM_F0 = 32, | |
65 | RISCV_DWARF_REGNUM_F31 = 63, | |
550820e1 AB |
66 | RISCV_DWARF_FIRST_CSR = 4096, |
67 | RISCV_DWARF_LAST_CSR = 8191, | |
fb44d95a AB |
68 | }; |
69 | ||
dbbb1059 AB |
70 | /* RISC-V specific per-architecture information. */ |
71 | struct gdbarch_tdep | |
72 | { | |
113b7b81 AB |
73 | /* Features about the target hardware that impact how the gdbarch is |
74 | configured. Two gdbarch instances are compatible only if this field | |
75 | matches. */ | |
76 | struct riscv_gdbarch_features isa_features; | |
77 | ||
78 | /* Features about the abi that impact how the gdbarch is configured. Two | |
79 | gdbarch instances are compatible only if this field matches. */ | |
80 | struct riscv_gdbarch_features abi_features; | |
270b9329 JW |
81 | |
82 | /* ISA-specific data types. */ | |
b5ffee31 | 83 | struct type *riscv_fpreg_d_type = nullptr; |
2e52d038 AB |
84 | |
85 | /* Use for tracking unknown CSRs in the target description. | |
86 | UNKNOWN_CSRS_FIRST_REGNUM is the number assigned to the first unknown | |
87 | CSR. All other unknown CSRs will be assigned sequential numbers after | |
88 | this, with UNKNOWN_CSRS_COUNT being the total number of unknown CSRs. */ | |
89 | int unknown_csrs_first_regnum = -1; | |
90 | int unknown_csrs_count = 0; | |
91 | ||
92 | /* Some targets (QEMU) are reporting three registers twice in the target | |
93 | description they send. These three register numbers, when not set to | |
94 | -1, are for the duplicate copies of these registers. */ | |
95 | int duplicate_fflags_regnum = -1; | |
96 | int duplicate_frm_regnum = -1; | |
97 | int duplicate_fcsr_regnum = -1; | |
98 | ||
dbbb1059 AB |
99 | }; |
100 | ||
8a613826 JW |
101 | |
102 | /* Return the width in bytes of the general purpose registers for GDBARCH. | |
103 | Possible return values are 4, 8, or 16 for RiscV variants RV32, RV64, or | |
104 | RV128. */ | |
411baa47 JW |
105 | extern int riscv_isa_xlen (struct gdbarch *gdbarch); |
106 | ||
113b7b81 AB |
107 | /* Return the width in bytes of the hardware floating point registers for |
108 | GDBARCH. If this architecture has no floating point registers, then | |
109 | return 0. Possible values are 4, 8, or 16 for depending on which of | |
110 | single, double or quad floating point support is available. */ | |
8a613826 JW |
111 | extern int riscv_isa_flen (struct gdbarch *gdbarch); |
112 | ||
113b7b81 AB |
113 | /* Return the width in bytes of the general purpose register abi for |
114 | GDBARCH. This can be equal to, or less than RISCV_ISA_XLEN and reflects | |
115 | how the binary was compiled rather than the hardware that is available. | |
116 | It is possible that a binary compiled for RV32 is being run on an RV64 | |
117 | target, in which case the isa xlen is 8-bytes, and the abi xlen is | |
118 | 4-bytes. This will impact how inferior functions are called. */ | |
119 | extern int riscv_abi_xlen (struct gdbarch *gdbarch); | |
120 | ||
121 | /* Return the width in bytes of the floating point register abi for | |
122 | GDBARCH. This reflects how the binary was compiled rather than the | |
123 | hardware that is available. It is possible that a binary is compiled | |
124 | for single precision floating point, and then run on a target with | |
125 | double precision floating point. A return value of 0 indicates that no | |
126 | floating point abi is in use (floating point arguments will be passed | |
127 | in integer registers) other possible return value are 4, 8, or 16 as | |
128 | with RISCV_ISA_FLEN. */ | |
129 | extern int riscv_abi_flen (struct gdbarch *gdbarch); | |
130 | ||
25428040 AB |
131 | /* Return true if GDBARCH is using the embedded x-regs abi, that is the |
132 | target only has 16 x-registers, which includes a reduced number of | |
133 | argument registers. */ | |
134 | extern bool riscv_abi_embedded (struct gdbarch *gdbarch); | |
135 | ||
5c720ed8 | 136 | /* Single step based on where the current instruction will take us. */ |
06ab9219 TT |
137 | extern std::vector<CORE_ADDR> riscv_software_single_step |
138 | (struct regcache *regcache); | |
5c720ed8 | 139 | |
6a9ad81c AB |
140 | /* Supply register REGNUM from the buffer REGS (length LEN) into |
141 | REGCACHE. REGSET describes the layout of the buffer. If REGNUM is -1 | |
142 | then all registers described by REGSET are supplied. | |
143 | ||
144 | The register RISCV_ZERO_REGNUM should not be described by REGSET, | |
145 | however, this register (which always has the value 0) will be supplied | |
146 | by this function if requested. | |
147 | ||
148 | The registers RISCV_CSR_FFLAGS_REGNUM and RISCV_CSR_FRM_REGNUM should | |
149 | not be described by REGSET, however, these register will be provided if | |
150 | requested assuming either: | |
151 | (a) REGCACHE already contains the value of RISCV_CSR_FCSR_REGNUM, or | |
152 | (b) REGSET describes the location of RISCV_CSR_FCSR_REGNUM in the REGS | |
153 | buffer. | |
154 | ||
155 | This function can be used as the supply function for either x-regs or | |
156 | f-regs when loading corefiles, and doesn't care which abi is currently | |
157 | in use. */ | |
158 | ||
159 | extern void riscv_supply_regset (const struct regset *regset, | |
160 | struct regcache *regcache, int regnum, | |
161 | const void *regs, size_t len); | |
162 | ||
d782d24b AB |
163 | /* The names of the RISC-V target description features. */ |
164 | extern const char *riscv_feature_name_csr; | |
165 | ||
dbbb1059 | 166 | #endif /* RISCV_TDEP_H */ |