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dbbb1059 AB |
1 | /* Target-dependent code for the RISC-V architecture, for GDB. |
2 | ||
b811d2c2 | 3 | Copyright (C) 2018-2020 Free Software Foundation, Inc. |
dbbb1059 | 4 | |
dbbb1059 AB |
5 | This file is part of GDB. |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include "defs.h" | |
21 | #include "frame.h" | |
22 | #include "inferior.h" | |
23 | #include "symtab.h" | |
24 | #include "value.h" | |
25 | #include "gdbcmd.h" | |
26 | #include "language.h" | |
27 | #include "gdbcore.h" | |
28 | #include "symfile.h" | |
29 | #include "objfiles.h" | |
30 | #include "gdbtypes.h" | |
31 | #include "target.h" | |
32 | #include "arch-utils.h" | |
33 | #include "regcache.h" | |
34 | #include "osabi.h" | |
35 | #include "riscv-tdep.h" | |
36 | #include "block.h" | |
37 | #include "reggroups.h" | |
38 | #include "opcode/riscv.h" | |
39 | #include "elf/riscv.h" | |
40 | #include "elf-bfd.h" | |
41 | #include "symcat.h" | |
42 | #include "dis-asm.h" | |
43 | #include "frame-unwind.h" | |
44 | #include "frame-base.h" | |
45 | #include "trad-frame.h" | |
46 | #include "infcall.h" | |
47 | #include "floatformat.h" | |
48 | #include "remote.h" | |
49 | #include "target-descriptions.h" | |
82ca8957 | 50 | #include "dwarf2/frame.h" |
dbbb1059 AB |
51 | #include "user-regs.h" |
52 | #include "valprint.h" | |
268a13a5 | 53 | #include "gdbsupport/common-defs.h" |
dbbb1059 AB |
54 | #include "opcode/riscv-opc.h" |
55 | #include "cli/cli-decode.h" | |
76727919 | 56 | #include "observable.h" |
78a3b0fa | 57 | #include "prologue-value.h" |
b5ffee31 | 58 | #include "arch/riscv.h" |
db3ad2f0 | 59 | #include "riscv-ravenscar-thread.h" |
dbbb1059 AB |
60 | |
61 | /* The stack must be 16-byte aligned. */ | |
62 | #define SP_ALIGNMENT 16 | |
63 | ||
ef2de9e7 JW |
64 | /* The biggest alignment that the target supports. */ |
65 | #define BIGGEST_ALIGNMENT 16 | |
66 | ||
dbbb1059 AB |
67 | /* Define a series of is_XXX_insn functions to check if the value INSN |
68 | is an instance of instruction XXX. */ | |
69 | #define DECLARE_INSN(INSN_NAME, INSN_MATCH, INSN_MASK) \ | |
70 | static inline bool is_ ## INSN_NAME ## _insn (long insn) \ | |
71 | { \ | |
72 | return (insn & INSN_MASK) == INSN_MATCH; \ | |
73 | } | |
74 | #include "opcode/riscv-opc.h" | |
75 | #undef DECLARE_INSN | |
76 | ||
78a3b0fa AB |
77 | /* Cached information about a frame. */ |
78 | ||
79 | struct riscv_unwind_cache | |
80 | { | |
81 | /* The register from which we can calculate the frame base. This is | |
82 | usually $sp or $fp. */ | |
83 | int frame_base_reg; | |
84 | ||
85 | /* The offset from the current value in register FRAME_BASE_REG to the | |
86 | actual frame base address. */ | |
87 | int frame_base_offset; | |
88 | ||
89 | /* Information about previous register values. */ | |
90 | struct trad_frame_saved_reg *regs; | |
91 | ||
92 | /* The id for this frame. */ | |
93 | struct frame_id this_id; | |
94 | ||
95 | /* The base (stack) address for this frame. This is the stack pointer | |
96 | value on entry to this frame before any adjustments are made. */ | |
97 | CORE_ADDR frame_base; | |
98 | }; | |
99 | ||
b5ffee31 | 100 | /* RISC-V specific register group for CSRs. */ |
dbbb1059 | 101 | |
b5ffee31 | 102 | static reggroup *csr_reggroup = NULL; |
dbbb1059 | 103 | |
b5ffee31 AB |
104 | /* A set of registers that we expect to find in a tdesc_feature. These |
105 | are use in RISCV_GDBARCH_INIT when processing the target description. */ | |
dbbb1059 | 106 | |
b5ffee31 | 107 | struct riscv_register_feature |
dbbb1059 | 108 | { |
b5ffee31 AB |
109 | /* Information for a single register. */ |
110 | struct register_info | |
111 | { | |
112 | /* The GDB register number for this register. */ | |
113 | int regnum; | |
114 | ||
115 | /* List of names for this register. The first name in this list is the | |
116 | preferred name, the name GDB should use when describing this | |
117 | register. */ | |
118 | std::vector <const char *> names; | |
119 | ||
120 | /* When true this register is required in this feature set. */ | |
121 | bool required_p; | |
122 | }; | |
123 | ||
124 | /* The name for this feature. This is the name used to find this feature | |
125 | within the target description. */ | |
dbbb1059 AB |
126 | const char *name; |
127 | ||
b5ffee31 AB |
128 | /* List of all the registers that we expect that we might find in this |
129 | register set. */ | |
130 | std::vector <struct register_info> registers; | |
131 | }; | |
132 | ||
133 | /* The general x-registers feature set. */ | |
134 | ||
135 | static const struct riscv_register_feature riscv_xreg_feature = | |
136 | { | |
137 | "org.gnu.gdb.riscv.cpu", | |
138 | { | |
139 | { RISCV_ZERO_REGNUM + 0, { "zero", "x0" }, true }, | |
140 | { RISCV_ZERO_REGNUM + 1, { "ra", "x1" }, true }, | |
141 | { RISCV_ZERO_REGNUM + 2, { "sp", "x2" }, true }, | |
142 | { RISCV_ZERO_REGNUM + 3, { "gp", "x3" }, true }, | |
143 | { RISCV_ZERO_REGNUM + 4, { "tp", "x4" }, true }, | |
144 | { RISCV_ZERO_REGNUM + 5, { "t0", "x5" }, true }, | |
145 | { RISCV_ZERO_REGNUM + 6, { "t1", "x6" }, true }, | |
146 | { RISCV_ZERO_REGNUM + 7, { "t2", "x7" }, true }, | |
147 | { RISCV_ZERO_REGNUM + 8, { "fp", "x8", "s0" }, true }, | |
148 | { RISCV_ZERO_REGNUM + 9, { "s1", "x9" }, true }, | |
149 | { RISCV_ZERO_REGNUM + 10, { "a0", "x10" }, true }, | |
150 | { RISCV_ZERO_REGNUM + 11, { "a1", "x11" }, true }, | |
151 | { RISCV_ZERO_REGNUM + 12, { "a2", "x12" }, true }, | |
152 | { RISCV_ZERO_REGNUM + 13, { "a3", "x13" }, true }, | |
153 | { RISCV_ZERO_REGNUM + 14, { "a4", "x14" }, true }, | |
154 | { RISCV_ZERO_REGNUM + 15, { "a5", "x15" }, true }, | |
155 | { RISCV_ZERO_REGNUM + 16, { "a6", "x16" }, true }, | |
156 | { RISCV_ZERO_REGNUM + 17, { "a7", "x17" }, true }, | |
157 | { RISCV_ZERO_REGNUM + 18, { "s2", "x18" }, true }, | |
158 | { RISCV_ZERO_REGNUM + 19, { "s3", "x19" }, true }, | |
159 | { RISCV_ZERO_REGNUM + 20, { "s4", "x20" }, true }, | |
160 | { RISCV_ZERO_REGNUM + 21, { "s5", "x21" }, true }, | |
161 | { RISCV_ZERO_REGNUM + 22, { "s6", "x22" }, true }, | |
162 | { RISCV_ZERO_REGNUM + 23, { "s7", "x23" }, true }, | |
163 | { RISCV_ZERO_REGNUM + 24, { "s8", "x24" }, true }, | |
164 | { RISCV_ZERO_REGNUM + 25, { "s9", "x25" }, true }, | |
165 | { RISCV_ZERO_REGNUM + 26, { "s10", "x26" }, true }, | |
166 | { RISCV_ZERO_REGNUM + 27, { "s11", "x27" }, true }, | |
167 | { RISCV_ZERO_REGNUM + 28, { "t3", "x28" }, true }, | |
168 | { RISCV_ZERO_REGNUM + 29, { "t4", "x29" }, true }, | |
169 | { RISCV_ZERO_REGNUM + 30, { "t5", "x30" }, true }, | |
170 | { RISCV_ZERO_REGNUM + 31, { "t6", "x31" }, true }, | |
171 | { RISCV_ZERO_REGNUM + 32, { "pc" }, true } | |
172 | } | |
173 | }; | |
174 | ||
175 | /* The f-registers feature set. */ | |
176 | ||
177 | static const struct riscv_register_feature riscv_freg_feature = | |
178 | { | |
179 | "org.gnu.gdb.riscv.fpu", | |
180 | { | |
181 | { RISCV_FIRST_FP_REGNUM + 0, { "ft0", "f0" }, true }, | |
182 | { RISCV_FIRST_FP_REGNUM + 1, { "ft1", "f1" }, true }, | |
183 | { RISCV_FIRST_FP_REGNUM + 2, { "ft2", "f2" }, true }, | |
184 | { RISCV_FIRST_FP_REGNUM + 3, { "ft3", "f3" }, true }, | |
185 | { RISCV_FIRST_FP_REGNUM + 4, { "ft4", "f4" }, true }, | |
186 | { RISCV_FIRST_FP_REGNUM + 5, { "ft5", "f5" }, true }, | |
187 | { RISCV_FIRST_FP_REGNUM + 6, { "ft6", "f6" }, true }, | |
188 | { RISCV_FIRST_FP_REGNUM + 7, { "ft7", "f7" }, true }, | |
592d8c0a | 189 | { RISCV_FIRST_FP_REGNUM + 8, { "fs0", "f8" }, true }, |
b5ffee31 AB |
190 | { RISCV_FIRST_FP_REGNUM + 9, { "fs1", "f9" }, true }, |
191 | { RISCV_FIRST_FP_REGNUM + 10, { "fa0", "f10" }, true }, | |
192 | { RISCV_FIRST_FP_REGNUM + 11, { "fa1", "f11" }, true }, | |
193 | { RISCV_FIRST_FP_REGNUM + 12, { "fa2", "f12" }, true }, | |
194 | { RISCV_FIRST_FP_REGNUM + 13, { "fa3", "f13" }, true }, | |
195 | { RISCV_FIRST_FP_REGNUM + 14, { "fa4", "f14" }, true }, | |
196 | { RISCV_FIRST_FP_REGNUM + 15, { "fa5", "f15" }, true }, | |
197 | { RISCV_FIRST_FP_REGNUM + 16, { "fa6", "f16" }, true }, | |
198 | { RISCV_FIRST_FP_REGNUM + 17, { "fa7", "f17" }, true }, | |
199 | { RISCV_FIRST_FP_REGNUM + 18, { "fs2", "f18" }, true }, | |
200 | { RISCV_FIRST_FP_REGNUM + 19, { "fs3", "f19" }, true }, | |
201 | { RISCV_FIRST_FP_REGNUM + 20, { "fs4", "f20" }, true }, | |
202 | { RISCV_FIRST_FP_REGNUM + 21, { "fs5", "f21" }, true }, | |
203 | { RISCV_FIRST_FP_REGNUM + 22, { "fs6", "f22" }, true }, | |
204 | { RISCV_FIRST_FP_REGNUM + 23, { "fs7", "f23" }, true }, | |
205 | { RISCV_FIRST_FP_REGNUM + 24, { "fs8", "f24" }, true }, | |
206 | { RISCV_FIRST_FP_REGNUM + 25, { "fs9", "f25" }, true }, | |
207 | { RISCV_FIRST_FP_REGNUM + 26, { "fs10", "f26" }, true }, | |
208 | { RISCV_FIRST_FP_REGNUM + 27, { "fs11", "f27" }, true }, | |
209 | { RISCV_FIRST_FP_REGNUM + 28, { "ft8", "f28" }, true }, | |
210 | { RISCV_FIRST_FP_REGNUM + 29, { "ft9", "f29" }, true }, | |
211 | { RISCV_FIRST_FP_REGNUM + 30, { "ft10", "f30" }, true }, | |
212 | { RISCV_FIRST_FP_REGNUM + 31, { "ft11", "f31" }, true }, | |
213 | ||
214 | { RISCV_CSR_FFLAGS_REGNUM, { "fflags" }, true }, | |
215 | { RISCV_CSR_FRM_REGNUM, { "frm" }, true }, | |
216 | { RISCV_CSR_FCSR_REGNUM, { "fcsr" }, true }, | |
217 | ||
218 | } | |
219 | }; | |
220 | ||
221 | /* Set of virtual registers. These are not physical registers on the | |
222 | hardware, but might be available from the target. These are not pseudo | |
223 | registers, reading these really does result in a register read from the | |
224 | target, it is just that there might not be a physical register backing | |
225 | the result. */ | |
226 | ||
227 | static const struct riscv_register_feature riscv_virtual_feature = | |
228 | { | |
229 | "org.gnu.gdb.riscv.virtual", | |
230 | { | |
231 | { RISCV_PRIV_REGNUM, { "priv" }, false } | |
232 | } | |
dbbb1059 AB |
233 | }; |
234 | ||
b5ffee31 AB |
235 | /* Feature set for CSRs. This set is NOT constant as the register names |
236 | list for each register is not complete. The aliases are computed | |
237 | during RISCV_CREATE_CSR_ALIASES. */ | |
238 | ||
239 | static struct riscv_register_feature riscv_csr_feature = | |
240 | { | |
241 | "org.gnu.gdb.riscv.csr", | |
242 | { | |
bd0cf5a6 | 243 | #define DECLARE_CSR(NAME,VALUE,CLASS) \ |
b5ffee31 AB |
244 | { RISCV_ ## VALUE ## _REGNUM, { # NAME }, false }, |
245 | #include "opcode/riscv-opc.h" | |
246 | #undef DECLARE_CSR | |
247 | } | |
dbbb1059 AB |
248 | }; |
249 | ||
b5ffee31 AB |
250 | /* Complete RISCV_CSR_FEATURE, building the CSR alias names and adding them |
251 | to the name list for each register. */ | |
252 | ||
253 | static void | |
254 | riscv_create_csr_aliases () | |
255 | { | |
256 | for (auto ® : riscv_csr_feature.registers) | |
257 | { | |
258 | int csr_num = reg.regnum - RISCV_FIRST_CSR_REGNUM; | |
259 | const char *alias = xstrprintf ("csr%d", csr_num); | |
260 | reg.names.push_back (alias); | |
261 | } | |
262 | } | |
263 | ||
dbbb1059 AB |
264 | /* Controls whether we place compressed breakpoints or not. When in auto |
265 | mode GDB tries to determine if the target supports compressed | |
266 | breakpoints, and uses them if it does. */ | |
267 | ||
268 | static enum auto_boolean use_compressed_breakpoints; | |
269 | ||
270 | /* The show callback for 'show riscv use-compressed-breakpoints'. */ | |
271 | ||
272 | static void | |
273 | show_use_compressed_breakpoints (struct ui_file *file, int from_tty, | |
274 | struct cmd_list_element *c, | |
275 | const char *value) | |
276 | { | |
dbbb1059 AB |
277 | fprintf_filtered (file, |
278 | _("Debugger's use of compressed breakpoints is set " | |
f37bc8b1 | 279 | "to %s.\n"), value); |
dbbb1059 AB |
280 | } |
281 | ||
282 | /* The set and show lists for 'set riscv' and 'show riscv' prefixes. */ | |
283 | ||
284 | static struct cmd_list_element *setriscvcmdlist = NULL; | |
285 | static struct cmd_list_element *showriscvcmdlist = NULL; | |
286 | ||
287 | /* The show callback for the 'show riscv' prefix command. */ | |
288 | ||
289 | static void | |
290 | show_riscv_command (const char *args, int from_tty) | |
291 | { | |
292 | help_list (showriscvcmdlist, "show riscv ", all_commands, gdb_stdout); | |
293 | } | |
294 | ||
295 | /* The set callback for the 'set riscv' prefix command. */ | |
296 | ||
297 | static void | |
298 | set_riscv_command (const char *args, int from_tty) | |
299 | { | |
300 | printf_unfiltered | |
301 | (_("\"set riscv\" must be followed by an appropriate subcommand.\n")); | |
302 | help_list (setriscvcmdlist, "set riscv ", all_commands, gdb_stdout); | |
303 | } | |
304 | ||
305 | /* The set and show lists for 'set riscv' and 'show riscv' prefixes. */ | |
306 | ||
307 | static struct cmd_list_element *setdebugriscvcmdlist = NULL; | |
308 | static struct cmd_list_element *showdebugriscvcmdlist = NULL; | |
309 | ||
310 | /* The show callback for the 'show debug riscv' prefix command. */ | |
311 | ||
312 | static void | |
313 | show_debug_riscv_command (const char *args, int from_tty) | |
314 | { | |
315 | help_list (showdebugriscvcmdlist, "show debug riscv ", all_commands, gdb_stdout); | |
316 | } | |
317 | ||
318 | /* The set callback for the 'set debug riscv' prefix command. */ | |
319 | ||
320 | static void | |
321 | set_debug_riscv_command (const char *args, int from_tty) | |
322 | { | |
323 | printf_unfiltered | |
324 | (_("\"set debug riscv\" must be followed by an appropriate subcommand.\n")); | |
325 | help_list (setdebugriscvcmdlist, "set debug riscv ", all_commands, gdb_stdout); | |
326 | } | |
327 | ||
328 | /* The show callback for all 'show debug riscv VARNAME' variables. */ | |
329 | ||
330 | static void | |
331 | show_riscv_debug_variable (struct ui_file *file, int from_tty, | |
332 | struct cmd_list_element *c, | |
333 | const char *value) | |
334 | { | |
335 | fprintf_filtered (file, | |
336 | _("RiscV debug variable `%s' is set to: %s\n"), | |
337 | c->name, value); | |
338 | } | |
339 | ||
f37bc8b1 JB |
340 | /* When this is set to non-zero debugging information about breakpoint |
341 | kinds will be printed. */ | |
342 | ||
343 | static unsigned int riscv_debug_breakpoints = 0; | |
344 | ||
dbbb1059 AB |
345 | /* When this is set to non-zero debugging information about inferior calls |
346 | will be printed. */ | |
347 | ||
348 | static unsigned int riscv_debug_infcall = 0; | |
349 | ||
78a3b0fa AB |
350 | /* When this is set to non-zero debugging information about stack unwinding |
351 | will be printed. */ | |
352 | ||
353 | static unsigned int riscv_debug_unwinder = 0; | |
354 | ||
b5ffee31 AB |
355 | /* When this is set to non-zero debugging information about gdbarch |
356 | initialisation will be printed. */ | |
dbbb1059 | 357 | |
b5ffee31 | 358 | static unsigned int riscv_debug_gdbarch = 0; |
dbbb1059 | 359 | |
8a613826 | 360 | /* See riscv-tdep.h. */ |
dbbb1059 | 361 | |
411baa47 | 362 | int |
dbbb1059 AB |
363 | riscv_isa_xlen (struct gdbarch *gdbarch) |
364 | { | |
113b7b81 AB |
365 | return gdbarch_tdep (gdbarch)->isa_features.xlen; |
366 | } | |
367 | ||
368 | /* See riscv-tdep.h. */ | |
369 | ||
370 | int | |
371 | riscv_abi_xlen (struct gdbarch *gdbarch) | |
372 | { | |
373 | return gdbarch_tdep (gdbarch)->abi_features.xlen; | |
dbbb1059 AB |
374 | } |
375 | ||
8a613826 | 376 | /* See riscv-tdep.h. */ |
dbbb1059 | 377 | |
8a613826 | 378 | int |
dbbb1059 AB |
379 | riscv_isa_flen (struct gdbarch *gdbarch) |
380 | { | |
113b7b81 AB |
381 | return gdbarch_tdep (gdbarch)->isa_features.flen; |
382 | } | |
383 | ||
384 | /* See riscv-tdep.h. */ | |
385 | ||
386 | int | |
387 | riscv_abi_flen (struct gdbarch *gdbarch) | |
388 | { | |
389 | return gdbarch_tdep (gdbarch)->abi_features.flen; | |
dbbb1059 AB |
390 | } |
391 | ||
392 | /* Return true if the target for GDBARCH has floating point hardware. */ | |
393 | ||
394 | static bool | |
395 | riscv_has_fp_regs (struct gdbarch *gdbarch) | |
396 | { | |
397 | return (riscv_isa_flen (gdbarch) > 0); | |
398 | } | |
399 | ||
400 | /* Return true if GDBARCH is using any of the floating point hardware ABIs. */ | |
401 | ||
402 | static bool | |
403 | riscv_has_fp_abi (struct gdbarch *gdbarch) | |
404 | { | |
113b7b81 | 405 | return gdbarch_tdep (gdbarch)->abi_features.flen > 0; |
dbbb1059 AB |
406 | } |
407 | ||
8c49aa89 AB |
408 | /* Return true if REGNO is a floating pointer register. */ |
409 | ||
410 | static bool | |
411 | riscv_is_fp_regno_p (int regno) | |
412 | { | |
413 | return (regno >= RISCV_FIRST_FP_REGNUM | |
414 | && regno <= RISCV_LAST_FP_REGNUM); | |
415 | } | |
416 | ||
dbbb1059 AB |
417 | /* Implement the breakpoint_kind_from_pc gdbarch method. */ |
418 | ||
419 | static int | |
420 | riscv_breakpoint_kind_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr) | |
421 | { | |
422 | if (use_compressed_breakpoints == AUTO_BOOLEAN_AUTO) | |
423 | { | |
3ba2ee38 | 424 | bool unaligned_p = false; |
f37bc8b1 JB |
425 | gdb_byte buf[1]; |
426 | ||
3ba2ee38 JW |
427 | /* Some targets don't support unaligned reads. The address can only |
428 | be unaligned if the C extension is supported. So it is safe to | |
429 | use a compressed breakpoint in this case. */ | |
430 | if (*pcptr & 0x2) | |
431 | unaligned_p = true; | |
432 | else | |
433 | { | |
c01660c6 AB |
434 | /* Read the opcode byte to determine the instruction length. If |
435 | the read fails this may be because we tried to set the | |
436 | breakpoint at an invalid address, in this case we provide a | |
437 | fake result which will give a breakpoint length of 4. | |
438 | Hopefully when we try to actually insert the breakpoint we | |
439 | will see a failure then too which will be reported to the | |
440 | user. */ | |
441 | if (target_read_code (*pcptr, buf, 1) == -1) | |
442 | buf[0] = 0; | |
3ba2ee38 JW |
443 | read_code (*pcptr, buf, 1); |
444 | } | |
f37bc8b1 JB |
445 | |
446 | if (riscv_debug_breakpoints) | |
3ba2ee38 JW |
447 | { |
448 | const char *bp = (unaligned_p || riscv_insn_length (buf[0]) == 2 | |
449 | ? "C.EBREAK" : "EBREAK"); | |
450 | ||
451 | fprintf_unfiltered (gdb_stdlog, "Using %s for breakpoint at %s ", | |
452 | bp, paddress (gdbarch, *pcptr)); | |
453 | if (unaligned_p) | |
454 | fprintf_unfiltered (gdb_stdlog, "(unaligned address)\n"); | |
455 | else | |
456 | fprintf_unfiltered (gdb_stdlog, "(instruction length %d)\n", | |
457 | riscv_insn_length (buf[0])); | |
458 | } | |
459 | if (unaligned_p || riscv_insn_length (buf[0]) == 2) | |
dbbb1059 AB |
460 | return 2; |
461 | else | |
462 | return 4; | |
463 | } | |
464 | else if (use_compressed_breakpoints == AUTO_BOOLEAN_TRUE) | |
465 | return 2; | |
466 | else | |
467 | return 4; | |
468 | } | |
469 | ||
470 | /* Implement the sw_breakpoint_from_kind gdbarch method. */ | |
471 | ||
472 | static const gdb_byte * | |
473 | riscv_sw_breakpoint_from_kind (struct gdbarch *gdbarch, int kind, int *size) | |
474 | { | |
475 | static const gdb_byte ebreak[] = { 0x73, 0x00, 0x10, 0x00, }; | |
476 | static const gdb_byte c_ebreak[] = { 0x02, 0x90 }; | |
477 | ||
478 | *size = kind; | |
479 | switch (kind) | |
480 | { | |
481 | case 2: | |
482 | return c_ebreak; | |
483 | case 4: | |
484 | return ebreak; | |
485 | default: | |
89a3b63e | 486 | gdb_assert_not_reached (_("unhandled breakpoint kind")); |
dbbb1059 AB |
487 | } |
488 | } | |
489 | ||
490 | /* Callback function for user_reg_add. */ | |
491 | ||
492 | static struct value * | |
493 | value_of_riscv_user_reg (struct frame_info *frame, const void *baton) | |
494 | { | |
495 | const int *reg_p = (const int *) baton; | |
496 | return value_of_register (*reg_p, frame); | |
497 | } | |
498 | ||
b5ffee31 AB |
499 | /* Implement the register_name gdbarch method. This is used instead of |
500 | the function supplied by calling TDESC_USE_REGISTERS so that we can | |
501 | ensure the preferred names are offered. */ | |
dbbb1059 AB |
502 | |
503 | static const char * | |
504 | riscv_register_name (struct gdbarch *gdbarch, int regnum) | |
505 | { | |
b5ffee31 AB |
506 | /* Lookup the name through the target description. If we get back NULL |
507 | then this is an unknown register. If we do get a name back then we | |
508 | look up the registers preferred name below. */ | |
509 | const char *name = tdesc_register_name (gdbarch, regnum); | |
510 | if (name == NULL || name[0] == '\0') | |
511 | return NULL; | |
512 | ||
513 | if (regnum >= RISCV_ZERO_REGNUM && regnum < RISCV_FIRST_FP_REGNUM) | |
514 | { | |
515 | gdb_assert (regnum < riscv_xreg_feature.registers.size ()); | |
516 | return riscv_xreg_feature.registers[regnum].names[0]; | |
517 | } | |
518 | ||
519 | if (regnum >= RISCV_FIRST_FP_REGNUM && regnum <= RISCV_LAST_FP_REGNUM) | |
dbbb1059 | 520 | { |
b5ffee31 AB |
521 | if (riscv_has_fp_regs (gdbarch)) |
522 | { | |
523 | regnum -= RISCV_FIRST_FP_REGNUM; | |
524 | gdb_assert (regnum < riscv_freg_feature.registers.size ()); | |
525 | return riscv_freg_feature.registers[regnum].names[0]; | |
526 | } | |
527 | else | |
528 | return NULL; | |
dbbb1059 AB |
529 | } |
530 | ||
0dbfcfff AB |
531 | /* Check that there's no gap between the set of registers handled above, |
532 | and the set of registers handled next. */ | |
533 | gdb_assert ((RISCV_LAST_FP_REGNUM + 1) == RISCV_FIRST_CSR_REGNUM); | |
dbbb1059 AB |
534 | |
535 | if (regnum >= RISCV_FIRST_CSR_REGNUM && regnum <= RISCV_LAST_CSR_REGNUM) | |
536 | { | |
bd0cf5a6 | 537 | #define DECLARE_CSR(NAME,VALUE,CLASS) \ |
420ecd9c | 538 | case RISCV_ ## VALUE ## _REGNUM: return # NAME; |
dbbb1059 | 539 | |
420ecd9c AB |
540 | switch (regnum) |
541 | { | |
69cb2952 | 542 | #include "opcode/riscv-opc.h" |
420ecd9c AB |
543 | } |
544 | #undef DECLARE_CSR | |
dbbb1059 AB |
545 | } |
546 | ||
547 | if (regnum == RISCV_PRIV_REGNUM) | |
548 | return "priv"; | |
549 | ||
b5ffee31 AB |
550 | /* It is possible that that the target provides some registers that GDB |
551 | is unaware of, in that case just return the NAME from the target | |
552 | description. */ | |
553 | return name; | |
dbbb1059 AB |
554 | } |
555 | ||
270b9329 JW |
556 | /* Construct a type for 64-bit FP registers. */ |
557 | ||
558 | static struct type * | |
559 | riscv_fpreg_d_type (struct gdbarch *gdbarch) | |
560 | { | |
561 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
562 | ||
563 | if (tdep->riscv_fpreg_d_type == nullptr) | |
564 | { | |
565 | const struct builtin_type *bt = builtin_type (gdbarch); | |
566 | ||
567 | /* The type we're building is this: */ | |
568 | #if 0 | |
569 | union __gdb_builtin_type_fpreg_d | |
570 | { | |
571 | float f; | |
572 | double d; | |
573 | }; | |
574 | #endif | |
575 | ||
576 | struct type *t; | |
577 | ||
578 | t = arch_composite_type (gdbarch, | |
579 | "__gdb_builtin_type_fpreg_d", TYPE_CODE_UNION); | |
580 | append_composite_type_field (t, "float", bt->builtin_float); | |
581 | append_composite_type_field (t, "double", bt->builtin_double); | |
582 | TYPE_VECTOR (t) = 1; | |
583 | TYPE_NAME (t) = "builtin_type_fpreg_d"; | |
584 | tdep->riscv_fpreg_d_type = t; | |
585 | } | |
586 | ||
587 | return tdep->riscv_fpreg_d_type; | |
588 | } | |
589 | ||
b5ffee31 AB |
590 | /* Implement the register_type gdbarch method. This is installed as an |
591 | for the override setup by TDESC_USE_REGISTERS, for most registers we | |
592 | delegate the type choice to the target description, but for a few | |
593 | registers we try to improve the types if the target description has | |
594 | taken a simplistic approach. */ | |
270b9329 JW |
595 | |
596 | static struct type * | |
b5ffee31 | 597 | riscv_register_type (struct gdbarch *gdbarch, int regnum) |
270b9329 | 598 | { |
b5ffee31 AB |
599 | struct type *type = tdesc_register_type (gdbarch, regnum); |
600 | int xlen = riscv_isa_xlen (gdbarch); | |
270b9329 | 601 | |
b5ffee31 AB |
602 | /* We want to perform some specific type "fixes" in cases where we feel |
603 | that we really can do better than the target description. For all | |
604 | other cases we just return what the target description says. */ | |
605 | if (riscv_is_fp_regno_p (regnum)) | |
270b9329 | 606 | { |
b5ffee31 AB |
607 | /* This spots the case for RV64 where the double is defined as |
608 | either 'ieee_double' or 'float' (which is the generic name that | |
609 | converts to 'double' on 64-bit). In these cases its better to | |
610 | present the registers using a union type. */ | |
611 | int flen = riscv_isa_flen (gdbarch); | |
612 | if (flen == 8 | |
613 | && TYPE_CODE (type) == TYPE_CODE_FLT | |
614 | && TYPE_LENGTH (type) == flen | |
615 | && (strcmp (TYPE_NAME (type), "builtin_type_ieee_double") == 0 | |
616 | || strcmp (TYPE_NAME (type), "double") == 0)) | |
617 | type = riscv_fpreg_d_type (gdbarch); | |
270b9329 JW |
618 | } |
619 | ||
b5ffee31 AB |
620 | if ((regnum == gdbarch_pc_regnum (gdbarch) |
621 | || regnum == RISCV_RA_REGNUM | |
622 | || regnum == RISCV_FP_REGNUM | |
623 | || regnum == RISCV_SP_REGNUM | |
624 | || regnum == RISCV_GP_REGNUM | |
625 | || regnum == RISCV_TP_REGNUM) | |
626 | && TYPE_CODE (type) == TYPE_CODE_INT | |
627 | && TYPE_LENGTH (type) == xlen) | |
dbbb1059 | 628 | { |
b5ffee31 AB |
629 | /* This spots the case where some interesting registers are defined |
630 | as simple integers of the expected size, we force these registers | |
631 | to be pointers as we believe that is more useful. */ | |
dbbb1059 | 632 | if (regnum == gdbarch_pc_regnum (gdbarch) |
b5ffee31 AB |
633 | || regnum == RISCV_RA_REGNUM) |
634 | type = builtin_type (gdbarch)->builtin_func_ptr; | |
635 | else if (regnum == RISCV_FP_REGNUM | |
636 | || regnum == RISCV_SP_REGNUM | |
637 | || regnum == RISCV_GP_REGNUM | |
638 | || regnum == RISCV_TP_REGNUM) | |
639 | type = builtin_type (gdbarch)->builtin_data_ptr; | |
dbbb1059 | 640 | } |
dbbb1059 | 641 | |
b5ffee31 | 642 | return type; |
dbbb1059 AB |
643 | } |
644 | ||
645 | /* Helper for riscv_print_registers_info, prints info for a single register | |
646 | REGNUM. */ | |
647 | ||
648 | static void | |
649 | riscv_print_one_register_info (struct gdbarch *gdbarch, | |
650 | struct ui_file *file, | |
651 | struct frame_info *frame, | |
652 | int regnum) | |
653 | { | |
654 | const char *name = gdbarch_register_name (gdbarch, regnum); | |
b5ffee31 AB |
655 | struct value *val; |
656 | struct type *regtype; | |
dbbb1059 AB |
657 | int print_raw_format; |
658 | enum tab_stops { value_column_1 = 15 }; | |
659 | ||
660 | fputs_filtered (name, file); | |
661 | print_spaces_filtered (value_column_1 - strlen (name), file); | |
662 | ||
a70b8144 | 663 | try |
b5ffee31 AB |
664 | { |
665 | val = value_of_register (regnum, frame); | |
666 | regtype = value_type (val); | |
667 | } | |
230d2906 | 668 | catch (const gdb_exception_error &ex) |
b5ffee31 AB |
669 | { |
670 | /* Handle failure to read a register without interrupting the entire | |
671 | 'info registers' flow. */ | |
3d6e9d23 | 672 | fprintf_filtered (file, "%s\n", ex.what ()); |
b5ffee31 AB |
673 | return; |
674 | } | |
b5ffee31 | 675 | |
dbbb1059 AB |
676 | print_raw_format = (value_entirely_available (val) |
677 | && !value_optimized_out (val)); | |
678 | ||
270b9329 JW |
679 | if (TYPE_CODE (regtype) == TYPE_CODE_FLT |
680 | || (TYPE_CODE (regtype) == TYPE_CODE_UNION | |
681 | && TYPE_NFIELDS (regtype) == 2 | |
682 | && TYPE_CODE (TYPE_FIELD_TYPE (regtype, 0)) == TYPE_CODE_FLT | |
683 | && TYPE_CODE (TYPE_FIELD_TYPE (regtype, 1)) == TYPE_CODE_FLT) | |
684 | || (TYPE_CODE (regtype) == TYPE_CODE_UNION | |
685 | && TYPE_NFIELDS (regtype) == 3 | |
686 | && TYPE_CODE (TYPE_FIELD_TYPE (regtype, 0)) == TYPE_CODE_FLT | |
687 | && TYPE_CODE (TYPE_FIELD_TYPE (regtype, 1)) == TYPE_CODE_FLT | |
688 | && TYPE_CODE (TYPE_FIELD_TYPE (regtype, 2)) == TYPE_CODE_FLT)) | |
dbbb1059 AB |
689 | { |
690 | struct value_print_options opts; | |
691 | const gdb_byte *valaddr = value_contents_for_printing (val); | |
34877895 | 692 | enum bfd_endian byte_order = type_byte_order (regtype); |
dbbb1059 AB |
693 | |
694 | get_user_print_options (&opts); | |
695 | opts.deref_ref = 1; | |
696 | ||
040f66bd | 697 | common_val_print (val, file, 0, &opts, current_language); |
dbbb1059 AB |
698 | |
699 | if (print_raw_format) | |
700 | { | |
701 | fprintf_filtered (file, "\t(raw "); | |
702 | print_hex_chars (file, valaddr, TYPE_LENGTH (regtype), byte_order, | |
703 | true); | |
704 | fprintf_filtered (file, ")"); | |
705 | } | |
706 | } | |
707 | else | |
708 | { | |
709 | struct value_print_options opts; | |
710 | ||
711 | /* Print the register in hex. */ | |
712 | get_formatted_print_options (&opts, 'x'); | |
713 | opts.deref_ref = 1; | |
040f66bd | 714 | common_val_print (val, file, 0, &opts, current_language); |
dbbb1059 AB |
715 | |
716 | if (print_raw_format) | |
717 | { | |
718 | if (regnum == RISCV_CSR_MSTATUS_REGNUM) | |
719 | { | |
720 | LONGEST d; | |
721 | int size = register_size (gdbarch, regnum); | |
722 | unsigned xlen; | |
723 | ||
b7c8601a JW |
724 | /* The SD field is always in the upper bit of MSTATUS, regardless |
725 | of the number of bits in MSTATUS. */ | |
dbbb1059 | 726 | d = value_as_long (val); |
b7c8601a | 727 | xlen = size * 8; |
dbbb1059 AB |
728 | fprintf_filtered (file, |
729 | "\tSD:%X VM:%02X MXR:%X PUM:%X MPRV:%X XS:%X " | |
730 | "FS:%X MPP:%x HPP:%X SPP:%X MPIE:%X HPIE:%X " | |
731 | "SPIE:%X UPIE:%X MIE:%X HIE:%X SIE:%X UIE:%X", | |
732 | (int) ((d >> (xlen - 1)) & 0x1), | |
733 | (int) ((d >> 24) & 0x1f), | |
734 | (int) ((d >> 19) & 0x1), | |
735 | (int) ((d >> 18) & 0x1), | |
736 | (int) ((d >> 17) & 0x1), | |
737 | (int) ((d >> 15) & 0x3), | |
738 | (int) ((d >> 13) & 0x3), | |
739 | (int) ((d >> 11) & 0x3), | |
740 | (int) ((d >> 9) & 0x3), | |
741 | (int) ((d >> 8) & 0x1), | |
742 | (int) ((d >> 7) & 0x1), | |
743 | (int) ((d >> 6) & 0x1), | |
744 | (int) ((d >> 5) & 0x1), | |
745 | (int) ((d >> 4) & 0x1), | |
746 | (int) ((d >> 3) & 0x1), | |
747 | (int) ((d >> 2) & 0x1), | |
748 | (int) ((d >> 1) & 0x1), | |
749 | (int) ((d >> 0) & 0x1)); | |
750 | } | |
751 | else if (regnum == RISCV_CSR_MISA_REGNUM) | |
752 | { | |
753 | int base; | |
754 | unsigned xlen, i; | |
755 | LONGEST d; | |
b7c8601a | 756 | int size = register_size (gdbarch, regnum); |
dbbb1059 | 757 | |
b7c8601a JW |
758 | /* The MXL field is always in the upper two bits of MISA, |
759 | regardless of the number of bits in MISA. Mask out other | |
760 | bits to ensure we have a positive value. */ | |
dbbb1059 | 761 | d = value_as_long (val); |
b7c8601a | 762 | base = (d >> ((size * 8) - 2)) & 0x3; |
dbbb1059 AB |
763 | xlen = 16; |
764 | ||
765 | for (; base > 0; base--) | |
766 | xlen *= 2; | |
767 | fprintf_filtered (file, "\tRV%d", xlen); | |
768 | ||
769 | for (i = 0; i < 26; i++) | |
770 | { | |
771 | if (d & (1 << i)) | |
772 | fprintf_filtered (file, "%c", 'A' + i); | |
773 | } | |
774 | } | |
775 | else if (regnum == RISCV_CSR_FCSR_REGNUM | |
776 | || regnum == RISCV_CSR_FFLAGS_REGNUM | |
777 | || regnum == RISCV_CSR_FRM_REGNUM) | |
778 | { | |
779 | LONGEST d; | |
780 | ||
781 | d = value_as_long (val); | |
782 | ||
783 | fprintf_filtered (file, "\t"); | |
784 | if (regnum != RISCV_CSR_FRM_REGNUM) | |
785 | fprintf_filtered (file, | |
786 | "RD:%01X NV:%d DZ:%d OF:%d UF:%d NX:%d", | |
787 | (int) ((d >> 5) & 0x7), | |
788 | (int) ((d >> 4) & 0x1), | |
789 | (int) ((d >> 3) & 0x1), | |
790 | (int) ((d >> 2) & 0x1), | |
791 | (int) ((d >> 1) & 0x1), | |
792 | (int) ((d >> 0) & 0x1)); | |
793 | ||
794 | if (regnum != RISCV_CSR_FFLAGS_REGNUM) | |
795 | { | |
796 | static const char * const sfrm[] = | |
797 | { | |
798 | "RNE (round to nearest; ties to even)", | |
799 | "RTZ (Round towards zero)", | |
800 | "RDN (Round down towards -INF)", | |
801 | "RUP (Round up towards +INF)", | |
802 | "RMM (Round to nearest; ties to max magnitude)", | |
803 | "INVALID[5]", | |
804 | "INVALID[6]", | |
805 | "dynamic rounding mode", | |
806 | }; | |
807 | int frm = ((regnum == RISCV_CSR_FCSR_REGNUM) | |
808 | ? (d >> 5) : d) & 0x3; | |
809 | ||
810 | fprintf_filtered (file, "%sFRM:%i [%s]", | |
811 | (regnum == RISCV_CSR_FCSR_REGNUM | |
812 | ? " " : ""), | |
813 | frm, sfrm[frm]); | |
814 | } | |
815 | } | |
816 | else if (regnum == RISCV_PRIV_REGNUM) | |
817 | { | |
818 | LONGEST d; | |
819 | uint8_t priv; | |
820 | ||
821 | d = value_as_long (val); | |
822 | priv = d & 0xff; | |
823 | ||
824 | if (priv < 4) | |
825 | { | |
826 | static const char * const sprv[] = | |
827 | { | |
828 | "User/Application", | |
829 | "Supervisor", | |
830 | "Hypervisor", | |
831 | "Machine" | |
832 | }; | |
833 | fprintf_filtered (file, "\tprv:%d [%s]", | |
834 | priv, sprv[priv]); | |
835 | } | |
836 | else | |
837 | fprintf_filtered (file, "\tprv:%d [INVALID]", priv); | |
838 | } | |
839 | else | |
840 | { | |
841 | /* If not a vector register, print it also according to its | |
842 | natural format. */ | |
843 | if (TYPE_VECTOR (regtype) == 0) | |
844 | { | |
845 | get_user_print_options (&opts); | |
846 | opts.deref_ref = 1; | |
847 | fprintf_filtered (file, "\t"); | |
040f66bd | 848 | common_val_print (val, file, 0, &opts, current_language); |
dbbb1059 AB |
849 | } |
850 | } | |
851 | } | |
852 | } | |
853 | fprintf_filtered (file, "\n"); | |
854 | } | |
855 | ||
0dbfcfff AB |
856 | /* Return true if REGNUM is a valid CSR register. The CSR register space |
857 | is sparsely populated, so not every number is a named CSR. */ | |
858 | ||
859 | static bool | |
860 | riscv_is_regnum_a_named_csr (int regnum) | |
861 | { | |
862 | gdb_assert (regnum >= RISCV_FIRST_CSR_REGNUM | |
863 | && regnum <= RISCV_LAST_CSR_REGNUM); | |
864 | ||
865 | switch (regnum) | |
866 | { | |
bd0cf5a6 | 867 | #define DECLARE_CSR(name, num, class) case RISCV_ ## num ## _REGNUM: |
0dbfcfff AB |
868 | #include "opcode/riscv-opc.h" |
869 | #undef DECLARE_CSR | |
870 | return true; | |
871 | ||
872 | default: | |
873 | return false; | |
874 | } | |
875 | } | |
876 | ||
dbbb1059 AB |
877 | /* Implement the register_reggroup_p gdbarch method. Is REGNUM a member |
878 | of REGGROUP? */ | |
879 | ||
880 | static int | |
881 | riscv_register_reggroup_p (struct gdbarch *gdbarch, int regnum, | |
882 | struct reggroup *reggroup) | |
883 | { | |
dbbb1059 AB |
884 | /* Used by 'info registers' and 'info registers <groupname>'. */ |
885 | ||
886 | if (gdbarch_register_name (gdbarch, regnum) == NULL | |
887 | || gdbarch_register_name (gdbarch, regnum)[0] == '\0') | |
888 | return 0; | |
889 | ||
b5ffee31 AB |
890 | if (regnum > RISCV_LAST_REGNUM) |
891 | { | |
892 | int ret = tdesc_register_in_reggroup_p (gdbarch, regnum, reggroup); | |
893 | if (ret != -1) | |
894 | return ret; | |
895 | ||
896 | return default_register_reggroup_p (gdbarch, regnum, reggroup); | |
897 | } | |
898 | ||
dbbb1059 AB |
899 | if (reggroup == all_reggroup) |
900 | { | |
901 | if (regnum < RISCV_FIRST_CSR_REGNUM || regnum == RISCV_PRIV_REGNUM) | |
902 | return 1; | |
0dbfcfff AB |
903 | if (riscv_is_regnum_a_named_csr (regnum)) |
904 | return 1; | |
dbbb1059 AB |
905 | return 0; |
906 | } | |
907 | else if (reggroup == float_reggroup) | |
8c49aa89 AB |
908 | return (riscv_is_fp_regno_p (regnum) |
909 | || regnum == RISCV_CSR_FCSR_REGNUM | |
910 | || regnum == RISCV_CSR_FFLAGS_REGNUM | |
911 | || regnum == RISCV_CSR_FRM_REGNUM); | |
dbbb1059 AB |
912 | else if (reggroup == general_reggroup) |
913 | return regnum < RISCV_FIRST_FP_REGNUM; | |
914 | else if (reggroup == restore_reggroup || reggroup == save_reggroup) | |
915 | { | |
916 | if (riscv_has_fp_regs (gdbarch)) | |
ecc82c05 AB |
917 | return (regnum <= RISCV_LAST_FP_REGNUM |
918 | || regnum == RISCV_CSR_FCSR_REGNUM | |
919 | || regnum == RISCV_CSR_FFLAGS_REGNUM | |
920 | || regnum == RISCV_CSR_FRM_REGNUM); | |
dbbb1059 AB |
921 | else |
922 | return regnum < RISCV_FIRST_FP_REGNUM; | |
923 | } | |
b5ffee31 | 924 | else if (reggroup == system_reggroup || reggroup == csr_reggroup) |
dbbb1059 AB |
925 | { |
926 | if (regnum == RISCV_PRIV_REGNUM) | |
927 | return 1; | |
928 | if (regnum < RISCV_FIRST_CSR_REGNUM || regnum > RISCV_LAST_CSR_REGNUM) | |
929 | return 0; | |
0dbfcfff AB |
930 | if (riscv_is_regnum_a_named_csr (regnum)) |
931 | return 1; | |
dbbb1059 AB |
932 | return 0; |
933 | } | |
934 | else if (reggroup == vector_reggroup) | |
935 | return 0; | |
936 | else | |
937 | return 0; | |
938 | } | |
939 | ||
940 | /* Implement the print_registers_info gdbarch method. This is used by | |
941 | 'info registers' and 'info all-registers'. */ | |
942 | ||
943 | static void | |
944 | riscv_print_registers_info (struct gdbarch *gdbarch, | |
945 | struct ui_file *file, | |
946 | struct frame_info *frame, | |
947 | int regnum, int print_all) | |
948 | { | |
949 | if (regnum != -1) | |
950 | { | |
951 | /* Print one specified register. */ | |
dbbb1059 AB |
952 | if (gdbarch_register_name (gdbarch, regnum) == NULL |
953 | || *(gdbarch_register_name (gdbarch, regnum)) == '\0') | |
954 | error (_("Not a valid register for the current processor type")); | |
955 | riscv_print_one_register_info (gdbarch, file, frame, regnum); | |
956 | } | |
957 | else | |
958 | { | |
959 | struct reggroup *reggroup; | |
960 | ||
961 | if (print_all) | |
962 | reggroup = all_reggroup; | |
963 | else | |
964 | reggroup = general_reggroup; | |
965 | ||
966 | for (regnum = 0; regnum <= RISCV_LAST_REGNUM; ++regnum) | |
967 | { | |
968 | /* Zero never changes, so might as well hide by default. */ | |
969 | if (regnum == RISCV_ZERO_REGNUM && !print_all) | |
970 | continue; | |
971 | ||
972 | /* Registers with no name are not valid on this ISA. */ | |
973 | if (gdbarch_register_name (gdbarch, regnum) == NULL | |
974 | || *(gdbarch_register_name (gdbarch, regnum)) == '\0') | |
975 | continue; | |
976 | ||
977 | /* Is the register in the group we're interested in? */ | |
b5ffee31 | 978 | if (!gdbarch_register_reggroup_p (gdbarch, regnum, reggroup)) |
dbbb1059 AB |
979 | continue; |
980 | ||
981 | riscv_print_one_register_info (gdbarch, file, frame, regnum); | |
982 | } | |
983 | } | |
984 | } | |
985 | ||
986 | /* Class that handles one decoded RiscV instruction. */ | |
987 | ||
988 | class riscv_insn | |
989 | { | |
990 | public: | |
991 | ||
992 | /* Enum of all the opcodes that GDB cares about during the prologue scan. */ | |
993 | enum opcode | |
994 | { | |
995 | /* Unknown value is used at initialisation time. */ | |
996 | UNKNOWN = 0, | |
997 | ||
998 | /* These instructions are all the ones we are interested in during the | |
999 | prologue scan. */ | |
1000 | ADD, | |
1001 | ADDI, | |
1002 | ADDIW, | |
1003 | ADDW, | |
1004 | AUIPC, | |
1005 | LUI, | |
1006 | SD, | |
1007 | SW, | |
405feb71 | 1008 | /* These are needed for software breakpoint support. */ |
5c720ed8 JW |
1009 | JAL, |
1010 | JALR, | |
1011 | BEQ, | |
1012 | BNE, | |
1013 | BLT, | |
1014 | BGE, | |
1015 | BLTU, | |
1016 | BGEU, | |
1017 | /* These are needed for stepping over atomic sequences. */ | |
1018 | LR, | |
1019 | SC, | |
dbbb1059 AB |
1020 | |
1021 | /* Other instructions are not interesting during the prologue scan, and | |
1022 | are ignored. */ | |
1023 | OTHER | |
1024 | }; | |
1025 | ||
1026 | riscv_insn () | |
1027 | : m_length (0), | |
1028 | m_opcode (OTHER), | |
1029 | m_rd (0), | |
1030 | m_rs1 (0), | |
1031 | m_rs2 (0) | |
1032 | { | |
1033 | /* Nothing. */ | |
1034 | } | |
1035 | ||
1036 | void decode (struct gdbarch *gdbarch, CORE_ADDR pc); | |
1037 | ||
1038 | /* Get the length of the instruction in bytes. */ | |
1039 | int length () const | |
1040 | { return m_length; } | |
1041 | ||
1042 | /* Get the opcode for this instruction. */ | |
1043 | enum opcode opcode () const | |
1044 | { return m_opcode; } | |
1045 | ||
1046 | /* Get destination register field for this instruction. This is only | |
1047 | valid if the OPCODE implies there is such a field for this | |
1048 | instruction. */ | |
1049 | int rd () const | |
1050 | { return m_rd; } | |
1051 | ||
1052 | /* Get the RS1 register field for this instruction. This is only valid | |
1053 | if the OPCODE implies there is such a field for this instruction. */ | |
1054 | int rs1 () const | |
1055 | { return m_rs1; } | |
1056 | ||
1057 | /* Get the RS2 register field for this instruction. This is only valid | |
1058 | if the OPCODE implies there is such a field for this instruction. */ | |
1059 | int rs2 () const | |
1060 | { return m_rs2; } | |
1061 | ||
1062 | /* Get the immediate for this instruction in signed form. This is only | |
1063 | valid if the OPCODE implies there is such a field for this | |
1064 | instruction. */ | |
1065 | int imm_signed () const | |
1066 | { return m_imm.s; } | |
1067 | ||
1068 | private: | |
1069 | ||
1070 | /* Extract 5 bit register field at OFFSET from instruction OPCODE. */ | |
1071 | int decode_register_index (unsigned long opcode, int offset) | |
1072 | { | |
1073 | return (opcode >> offset) & 0x1F; | |
1074 | } | |
1075 | ||
5c720ed8 JW |
1076 | /* Extract 5 bit register field at OFFSET from instruction OPCODE. */ |
1077 | int decode_register_index_short (unsigned long opcode, int offset) | |
1078 | { | |
1079 | return ((opcode >> offset) & 0x7) + 8; | |
1080 | } | |
1081 | ||
dbbb1059 AB |
1082 | /* Helper for DECODE, decode 32-bit R-type instruction. */ |
1083 | void decode_r_type_insn (enum opcode opcode, ULONGEST ival) | |
1084 | { | |
1085 | m_opcode = opcode; | |
1086 | m_rd = decode_register_index (ival, OP_SH_RD); | |
1087 | m_rs1 = decode_register_index (ival, OP_SH_RS1); | |
1088 | m_rs2 = decode_register_index (ival, OP_SH_RS2); | |
1089 | } | |
1090 | ||
1091 | /* Helper for DECODE, decode 16-bit compressed R-type instruction. */ | |
1092 | void decode_cr_type_insn (enum opcode opcode, ULONGEST ival) | |
1093 | { | |
1094 | m_opcode = opcode; | |
1095 | m_rd = m_rs1 = decode_register_index (ival, OP_SH_CRS1S); | |
1096 | m_rs2 = decode_register_index (ival, OP_SH_CRS2); | |
1097 | } | |
1098 | ||
1099 | /* Helper for DECODE, decode 32-bit I-type instruction. */ | |
1100 | void decode_i_type_insn (enum opcode opcode, ULONGEST ival) | |
1101 | { | |
1102 | m_opcode = opcode; | |
1103 | m_rd = decode_register_index (ival, OP_SH_RD); | |
1104 | m_rs1 = decode_register_index (ival, OP_SH_RS1); | |
1105 | m_imm.s = EXTRACT_ITYPE_IMM (ival); | |
1106 | } | |
1107 | ||
1108 | /* Helper for DECODE, decode 16-bit compressed I-type instruction. */ | |
1109 | void decode_ci_type_insn (enum opcode opcode, ULONGEST ival) | |
1110 | { | |
1111 | m_opcode = opcode; | |
1112 | m_rd = m_rs1 = decode_register_index (ival, OP_SH_CRS1S); | |
1113 | m_imm.s = EXTRACT_RVC_IMM (ival); | |
1114 | } | |
1115 | ||
1116 | /* Helper for DECODE, decode 32-bit S-type instruction. */ | |
1117 | void decode_s_type_insn (enum opcode opcode, ULONGEST ival) | |
1118 | { | |
1119 | m_opcode = opcode; | |
1120 | m_rs1 = decode_register_index (ival, OP_SH_RS1); | |
1121 | m_rs2 = decode_register_index (ival, OP_SH_RS2); | |
1122 | m_imm.s = EXTRACT_STYPE_IMM (ival); | |
1123 | } | |
1124 | ||
ff3a05b3 AB |
1125 | /* Helper for DECODE, decode 16-bit CS-type instruction. The immediate |
1126 | encoding is different for each CS format instruction, so extracting | |
1127 | the immediate is left up to the caller, who should pass the extracted | |
1128 | immediate value through in IMM. */ | |
1129 | void decode_cs_type_insn (enum opcode opcode, ULONGEST ival, int imm) | |
1130 | { | |
1131 | m_opcode = opcode; | |
1132 | m_imm.s = imm; | |
1133 | m_rs1 = decode_register_index_short (ival, OP_SH_CRS1S); | |
1134 | m_rs2 = decode_register_index_short (ival, OP_SH_CRS2S); | |
1135 | } | |
1136 | ||
1137 | /* Helper for DECODE, decode 16-bit CSS-type instruction. The immediate | |
1138 | encoding is different for each CSS format instruction, so extracting | |
1139 | the immediate is left up to the caller, who should pass the extracted | |
1140 | immediate value through in IMM. */ | |
1141 | void decode_css_type_insn (enum opcode opcode, ULONGEST ival, int imm) | |
1142 | { | |
1143 | m_opcode = opcode; | |
1144 | m_imm.s = imm; | |
1145 | m_rs1 = RISCV_SP_REGNUM; | |
1146 | /* Not a compressed register number in this case. */ | |
1147 | m_rs2 = decode_register_index (ival, OP_SH_CRS2); | |
1148 | } | |
1149 | ||
dbbb1059 AB |
1150 | /* Helper for DECODE, decode 32-bit U-type instruction. */ |
1151 | void decode_u_type_insn (enum opcode opcode, ULONGEST ival) | |
1152 | { | |
1153 | m_opcode = opcode; | |
1154 | m_rd = decode_register_index (ival, OP_SH_RD); | |
1155 | m_imm.s = EXTRACT_UTYPE_IMM (ival); | |
1156 | } | |
1157 | ||
5c720ed8 JW |
1158 | /* Helper for DECODE, decode 32-bit J-type instruction. */ |
1159 | void decode_j_type_insn (enum opcode opcode, ULONGEST ival) | |
1160 | { | |
1161 | m_opcode = opcode; | |
1162 | m_rd = decode_register_index (ival, OP_SH_RD); | |
1163 | m_imm.s = EXTRACT_UJTYPE_IMM (ival); | |
1164 | } | |
1165 | ||
1166 | /* Helper for DECODE, decode 32-bit J-type instruction. */ | |
1167 | void decode_cj_type_insn (enum opcode opcode, ULONGEST ival) | |
1168 | { | |
1169 | m_opcode = opcode; | |
1170 | m_imm.s = EXTRACT_RVC_J_IMM (ival); | |
1171 | } | |
1172 | ||
1173 | void decode_b_type_insn (enum opcode opcode, ULONGEST ival) | |
1174 | { | |
1175 | m_opcode = opcode; | |
1176 | m_rs1 = decode_register_index (ival, OP_SH_RS1); | |
1177 | m_rs2 = decode_register_index (ival, OP_SH_RS2); | |
1178 | m_imm.s = EXTRACT_SBTYPE_IMM (ival); | |
1179 | } | |
1180 | ||
1181 | void decode_cb_type_insn (enum opcode opcode, ULONGEST ival) | |
1182 | { | |
1183 | m_opcode = opcode; | |
1184 | m_rs1 = decode_register_index_short (ival, OP_SH_CRS1S); | |
1185 | m_imm.s = EXTRACT_RVC_B_IMM (ival); | |
1186 | } | |
1187 | ||
dbbb1059 AB |
1188 | /* Fetch instruction from target memory at ADDR, return the content of |
1189 | the instruction, and update LEN with the instruction length. */ | |
1190 | static ULONGEST fetch_instruction (struct gdbarch *gdbarch, | |
1191 | CORE_ADDR addr, int *len); | |
1192 | ||
1193 | /* The length of the instruction in bytes. Should be 2 or 4. */ | |
1194 | int m_length; | |
1195 | ||
1196 | /* The instruction opcode. */ | |
1197 | enum opcode m_opcode; | |
1198 | ||
1199 | /* The three possible registers an instruction might reference. Not | |
1200 | every instruction fills in all of these registers. Which fields are | |
1201 | valid depends on the opcode. The naming of these fields matches the | |
1202 | naming in the riscv isa manual. */ | |
1203 | int m_rd; | |
1204 | int m_rs1; | |
1205 | int m_rs2; | |
1206 | ||
1207 | /* Possible instruction immediate. This is only valid if the instruction | |
1208 | format contains an immediate, not all instruction, whether this is | |
1209 | valid depends on the opcode. Despite only having one format for now | |
1210 | the immediate is packed into a union, later instructions might require | |
1211 | an unsigned formatted immediate, having the union in place now will | |
1212 | reduce the need for code churn later. */ | |
1213 | union riscv_insn_immediate | |
1214 | { | |
1215 | riscv_insn_immediate () | |
1216 | : s (0) | |
1217 | { | |
1218 | /* Nothing. */ | |
1219 | } | |
1220 | ||
1221 | int s; | |
1222 | } m_imm; | |
1223 | }; | |
1224 | ||
1225 | /* Fetch instruction from target memory at ADDR, return the content of the | |
1226 | instruction, and update LEN with the instruction length. */ | |
1227 | ||
1228 | ULONGEST | |
1229 | riscv_insn::fetch_instruction (struct gdbarch *gdbarch, | |
1230 | CORE_ADDR addr, int *len) | |
1231 | { | |
1232 | enum bfd_endian byte_order = gdbarch_byte_order_for_code (gdbarch); | |
1233 | gdb_byte buf[8]; | |
1234 | int instlen, status; | |
1235 | ||
1236 | /* All insns are at least 16 bits. */ | |
1237 | status = target_read_memory (addr, buf, 2); | |
1238 | if (status) | |
1239 | memory_error (TARGET_XFER_E_IO, addr); | |
1240 | ||
1241 | /* If we need more, grab it now. */ | |
1242 | instlen = riscv_insn_length (buf[0]); | |
89a3b63e | 1243 | gdb_assert (instlen <= sizeof (buf)); |
dbbb1059 | 1244 | *len = instlen; |
89a3b63e AB |
1245 | |
1246 | if (instlen > 2) | |
dbbb1059 AB |
1247 | { |
1248 | status = target_read_memory (addr + 2, buf + 2, instlen - 2); | |
1249 | if (status) | |
1250 | memory_error (TARGET_XFER_E_IO, addr + 2); | |
1251 | } | |
1252 | ||
1253 | return extract_unsigned_integer (buf, instlen, byte_order); | |
1254 | } | |
1255 | ||
17cf2897 AB |
1256 | /* Fetch from target memory an instruction at PC and decode it. This can |
1257 | throw an error if the memory access fails, callers are responsible for | |
1258 | handling this error if that is appropriate. */ | |
dbbb1059 AB |
1259 | |
1260 | void | |
1261 | riscv_insn::decode (struct gdbarch *gdbarch, CORE_ADDR pc) | |
1262 | { | |
1263 | ULONGEST ival; | |
1264 | ||
1265 | /* Fetch the instruction, and the instructions length. */ | |
1266 | ival = fetch_instruction (gdbarch, pc, &m_length); | |
1267 | ||
1268 | if (m_length == 4) | |
1269 | { | |
1270 | if (is_add_insn (ival)) | |
1271 | decode_r_type_insn (ADD, ival); | |
1272 | else if (is_addw_insn (ival)) | |
1273 | decode_r_type_insn (ADDW, ival); | |
1274 | else if (is_addi_insn (ival)) | |
1275 | decode_i_type_insn (ADDI, ival); | |
1276 | else if (is_addiw_insn (ival)) | |
1277 | decode_i_type_insn (ADDIW, ival); | |
1278 | else if (is_auipc_insn (ival)) | |
1279 | decode_u_type_insn (AUIPC, ival); | |
1280 | else if (is_lui_insn (ival)) | |
1281 | decode_u_type_insn (LUI, ival); | |
1282 | else if (is_sd_insn (ival)) | |
1283 | decode_s_type_insn (SD, ival); | |
1284 | else if (is_sw_insn (ival)) | |
1285 | decode_s_type_insn (SW, ival); | |
5c720ed8 JW |
1286 | else if (is_jal_insn (ival)) |
1287 | decode_j_type_insn (JAL, ival); | |
1288 | else if (is_jalr_insn (ival)) | |
1289 | decode_i_type_insn (JALR, ival); | |
1290 | else if (is_beq_insn (ival)) | |
1291 | decode_b_type_insn (BEQ, ival); | |
1292 | else if (is_bne_insn (ival)) | |
1293 | decode_b_type_insn (BNE, ival); | |
1294 | else if (is_blt_insn (ival)) | |
1295 | decode_b_type_insn (BLT, ival); | |
1296 | else if (is_bge_insn (ival)) | |
1297 | decode_b_type_insn (BGE, ival); | |
1298 | else if (is_bltu_insn (ival)) | |
1299 | decode_b_type_insn (BLTU, ival); | |
1300 | else if (is_bgeu_insn (ival)) | |
1301 | decode_b_type_insn (BGEU, ival); | |
1302 | else if (is_lr_w_insn (ival)) | |
1303 | decode_r_type_insn (LR, ival); | |
1304 | else if (is_lr_d_insn (ival)) | |
1305 | decode_r_type_insn (LR, ival); | |
1306 | else if (is_sc_w_insn (ival)) | |
1307 | decode_r_type_insn (SC, ival); | |
1308 | else if (is_sc_d_insn (ival)) | |
1309 | decode_r_type_insn (SC, ival); | |
dbbb1059 AB |
1310 | else |
1311 | /* None of the other fields are valid in this case. */ | |
1312 | m_opcode = OTHER; | |
1313 | } | |
1314 | else if (m_length == 2) | |
1315 | { | |
5c720ed8 JW |
1316 | int xlen = riscv_isa_xlen (gdbarch); |
1317 | ||
1318 | /* C_ADD and C_JALR have the same opcode. If RS2 is 0, then this is a | |
1319 | C_JALR. So must try to match C_JALR first as it has more bits in | |
1320 | mask. */ | |
1321 | if (is_c_jalr_insn (ival)) | |
1322 | decode_cr_type_insn (JALR, ival); | |
1323 | else if (is_c_add_insn (ival)) | |
dbbb1059 | 1324 | decode_cr_type_insn (ADD, ival); |
5c720ed8 JW |
1325 | /* C_ADDW is RV64 and RV128 only. */ |
1326 | else if (xlen != 4 && is_c_addw_insn (ival)) | |
dbbb1059 AB |
1327 | decode_cr_type_insn (ADDW, ival); |
1328 | else if (is_c_addi_insn (ival)) | |
1329 | decode_ci_type_insn (ADDI, ival); | |
5c720ed8 JW |
1330 | /* C_ADDIW and C_JAL have the same opcode. C_ADDIW is RV64 and RV128 |
1331 | only and C_JAL is RV32 only. */ | |
1332 | else if (xlen != 4 && is_c_addiw_insn (ival)) | |
dbbb1059 | 1333 | decode_ci_type_insn (ADDIW, ival); |
5c720ed8 JW |
1334 | else if (xlen == 4 && is_c_jal_insn (ival)) |
1335 | decode_cj_type_insn (JAL, ival); | |
1336 | /* C_ADDI16SP and C_LUI have the same opcode. If RD is 2, then this is a | |
1337 | C_ADDI16SP. So must try to match C_ADDI16SP first as it has more bits | |
1338 | in mask. */ | |
dbbb1059 AB |
1339 | else if (is_c_addi16sp_insn (ival)) |
1340 | { | |
1341 | m_opcode = ADDI; | |
1342 | m_rd = m_rs1 = decode_register_index (ival, OP_SH_RD); | |
1343 | m_imm.s = EXTRACT_RVC_ADDI16SP_IMM (ival); | |
1344 | } | |
ff3a05b3 AB |
1345 | else if (is_c_addi4spn_insn (ival)) |
1346 | { | |
1347 | m_opcode = ADDI; | |
1348 | m_rd = decode_register_index_short (ival, OP_SH_CRS2S); | |
1349 | m_rs1 = RISCV_SP_REGNUM; | |
1350 | m_imm.s = EXTRACT_RVC_ADDI4SPN_IMM (ival); | |
1351 | } | |
5c720ed8 | 1352 | else if (is_c_lui_insn (ival)) |
d354055e AB |
1353 | { |
1354 | m_opcode = LUI; | |
1355 | m_rd = decode_register_index (ival, OP_SH_CRS1S); | |
1356 | m_imm.s = EXTRACT_RVC_LUI_IMM (ival); | |
1357 | } | |
5c720ed8 JW |
1358 | /* C_SD and C_FSW have the same opcode. C_SD is RV64 and RV128 only, |
1359 | and C_FSW is RV32 only. */ | |
1360 | else if (xlen != 4 && is_c_sd_insn (ival)) | |
ff3a05b3 | 1361 | decode_cs_type_insn (SD, ival, EXTRACT_RVC_LD_IMM (ival)); |
5c720ed8 | 1362 | else if (is_c_sw_insn (ival)) |
ff3a05b3 AB |
1363 | decode_cs_type_insn (SW, ival, EXTRACT_RVC_LW_IMM (ival)); |
1364 | else if (is_c_swsp_insn (ival)) | |
1365 | decode_css_type_insn (SW, ival, EXTRACT_RVC_SWSP_IMM (ival)); | |
1366 | else if (xlen != 4 && is_c_sdsp_insn (ival)) | |
1367 | decode_css_type_insn (SW, ival, EXTRACT_RVC_SDSP_IMM (ival)); | |
5c720ed8 JW |
1368 | /* C_JR and C_MV have the same opcode. If RS2 is 0, then this is a C_JR. |
1369 | So must try to match C_JR first as it ahs more bits in mask. */ | |
1370 | else if (is_c_jr_insn (ival)) | |
1371 | decode_cr_type_insn (JALR, ival); | |
1372 | else if (is_c_j_insn (ival)) | |
1373 | decode_cj_type_insn (JAL, ival); | |
1374 | else if (is_c_beqz_insn (ival)) | |
1375 | decode_cb_type_insn (BEQ, ival); | |
1376 | else if (is_c_bnez_insn (ival)) | |
1377 | decode_cb_type_insn (BNE, ival); | |
dbbb1059 AB |
1378 | else |
1379 | /* None of the other fields of INSN are valid in this case. */ | |
1380 | m_opcode = OTHER; | |
1381 | } | |
1382 | else | |
312617a3 AB |
1383 | { |
1384 | /* This must be a 6 or 8 byte instruction, we don't currently decode | |
1385 | any of these, so just ignore it. */ | |
1386 | gdb_assert (m_length == 6 || m_length == 8); | |
1387 | m_opcode = OTHER; | |
1388 | } | |
dbbb1059 AB |
1389 | } |
1390 | ||
1391 | /* The prologue scanner. This is currently only used for skipping the | |
1392 | prologue of a function when the DWARF information is not sufficient. | |
1393 | However, it is written with filling of the frame cache in mind, which | |
1394 | is why different groups of stack setup instructions are split apart | |
1395 | during the core of the inner loop. In the future, the intention is to | |
1396 | extend this function to fully support building up a frame cache that | |
1397 | can unwind register values when there is no DWARF information. */ | |
1398 | ||
1399 | static CORE_ADDR | |
1400 | riscv_scan_prologue (struct gdbarch *gdbarch, | |
78a3b0fa AB |
1401 | CORE_ADDR start_pc, CORE_ADDR end_pc, |
1402 | struct riscv_unwind_cache *cache) | |
dbbb1059 | 1403 | { |
78a3b0fa | 1404 | CORE_ADDR cur_pc, next_pc, after_prologue_pc; |
dbbb1059 AB |
1405 | CORE_ADDR end_prologue_addr = 0; |
1406 | ||
78a3b0fa AB |
1407 | /* Find an upper limit on the function prologue using the debug |
1408 | information. If the debug information could not be used to provide | |
1409 | that bound, then use an arbitrary large number as the upper bound. */ | |
1410 | after_prologue_pc = skip_prologue_using_sal (gdbarch, start_pc); | |
1411 | if (after_prologue_pc == 0) | |
1412 | after_prologue_pc = start_pc + 100; /* Arbitrary large number. */ | |
1413 | if (after_prologue_pc < end_pc) | |
1414 | end_pc = after_prologue_pc; | |
1415 | ||
1416 | pv_t regs[RISCV_NUM_INTEGER_REGS]; /* Number of GPR. */ | |
1417 | for (int regno = 0; regno < RISCV_NUM_INTEGER_REGS; regno++) | |
1418 | regs[regno] = pv_register (regno, 0); | |
1419 | pv_area stack (RISCV_SP_REGNUM, gdbarch_addr_bit (gdbarch)); | |
1420 | ||
1421 | if (riscv_debug_unwinder) | |
1422 | fprintf_unfiltered | |
1423 | (gdb_stdlog, | |
1424 | "Prologue scan for function starting at %s (limit %s)\n", | |
1425 | core_addr_to_string (start_pc), | |
1426 | core_addr_to_string (end_pc)); | |
1427 | ||
1428 | for (next_pc = cur_pc = start_pc; cur_pc < end_pc; cur_pc = next_pc) | |
dbbb1059 AB |
1429 | { |
1430 | struct riscv_insn insn; | |
1431 | ||
1432 | /* Decode the current instruction, and decide where the next | |
1433 | instruction lives based on the size of this instruction. */ | |
1434 | insn.decode (gdbarch, cur_pc); | |
1435 | gdb_assert (insn.length () > 0); | |
1436 | next_pc = cur_pc + insn.length (); | |
1437 | ||
1438 | /* Look for common stack adjustment insns. */ | |
1439 | if ((insn.opcode () == riscv_insn::ADDI | |
1440 | || insn.opcode () == riscv_insn::ADDIW) | |
1441 | && insn.rd () == RISCV_SP_REGNUM | |
1442 | && insn.rs1 () == RISCV_SP_REGNUM) | |
1443 | { | |
1444 | /* Handle: addi sp, sp, -i | |
1445 | or: addiw sp, sp, -i */ | |
78a3b0fa AB |
1446 | gdb_assert (insn.rd () < RISCV_NUM_INTEGER_REGS); |
1447 | gdb_assert (insn.rs1 () < RISCV_NUM_INTEGER_REGS); | |
1448 | regs[insn.rd ()] | |
1449 | = pv_add_constant (regs[insn.rs1 ()], insn.imm_signed ()); | |
dbbb1059 AB |
1450 | } |
1451 | else if ((insn.opcode () == riscv_insn::SW | |
1452 | || insn.opcode () == riscv_insn::SD) | |
1453 | && (insn.rs1 () == RISCV_SP_REGNUM | |
1454 | || insn.rs1 () == RISCV_FP_REGNUM)) | |
1455 | { | |
1456 | /* Handle: sw reg, offset(sp) | |
1457 | or: sd reg, offset(sp) | |
1458 | or: sw reg, offset(s0) | |
1459 | or: sd reg, offset(s0) */ | |
1460 | /* Instruction storing a register onto the stack. */ | |
78a3b0fa AB |
1461 | gdb_assert (insn.rs1 () < RISCV_NUM_INTEGER_REGS); |
1462 | gdb_assert (insn.rs2 () < RISCV_NUM_INTEGER_REGS); | |
1463 | stack.store (pv_add_constant (regs[insn.rs1 ()], insn.imm_signed ()), | |
1464 | (insn.opcode () == riscv_insn::SW ? 4 : 8), | |
1465 | regs[insn.rs2 ()]); | |
dbbb1059 AB |
1466 | } |
1467 | else if (insn.opcode () == riscv_insn::ADDI | |
1468 | && insn.rd () == RISCV_FP_REGNUM | |
1469 | && insn.rs1 () == RISCV_SP_REGNUM) | |
1470 | { | |
1471 | /* Handle: addi s0, sp, size */ | |
1472 | /* Instructions setting up the frame pointer. */ | |
78a3b0fa AB |
1473 | gdb_assert (insn.rd () < RISCV_NUM_INTEGER_REGS); |
1474 | gdb_assert (insn.rs1 () < RISCV_NUM_INTEGER_REGS); | |
1475 | regs[insn.rd ()] | |
1476 | = pv_add_constant (regs[insn.rs1 ()], insn.imm_signed ()); | |
dbbb1059 AB |
1477 | } |
1478 | else if ((insn.opcode () == riscv_insn::ADD | |
1479 | || insn.opcode () == riscv_insn::ADDW) | |
1480 | && insn.rd () == RISCV_FP_REGNUM | |
1481 | && insn.rs1 () == RISCV_SP_REGNUM | |
1482 | && insn.rs2 () == RISCV_ZERO_REGNUM) | |
1483 | { | |
1484 | /* Handle: add s0, sp, 0 | |
1485 | or: addw s0, sp, 0 */ | |
1486 | /* Instructions setting up the frame pointer. */ | |
78a3b0fa AB |
1487 | gdb_assert (insn.rd () < RISCV_NUM_INTEGER_REGS); |
1488 | gdb_assert (insn.rs1 () < RISCV_NUM_INTEGER_REGS); | |
1489 | regs[insn.rd ()] = pv_add_constant (regs[insn.rs1 ()], 0); | |
dbbb1059 | 1490 | } |
d354055e AB |
1491 | else if ((insn.opcode () == riscv_insn::ADDI |
1492 | && insn.rd () == RISCV_ZERO_REGNUM | |
1493 | && insn.rs1 () == RISCV_ZERO_REGNUM | |
1494 | && insn.imm_signed () == 0)) | |
dbbb1059 | 1495 | { |
d354055e | 1496 | /* Handle: add x0, x0, 0 (NOP) */ |
dbbb1059 | 1497 | } |
d354055e AB |
1498 | else if (insn.opcode () == riscv_insn::AUIPC) |
1499 | { | |
1500 | gdb_assert (insn.rd () < RISCV_NUM_INTEGER_REGS); | |
1501 | regs[insn.rd ()] = pv_constant (cur_pc + insn.imm_signed ()); | |
1502 | } | |
1503 | else if (insn.opcode () == riscv_insn::LUI) | |
1504 | { | |
1505 | /* Handle: lui REG, n | |
1506 | Where REG is not gp register. */ | |
1507 | gdb_assert (insn.rd () < RISCV_NUM_INTEGER_REGS); | |
1508 | regs[insn.rd ()] = pv_constant (insn.imm_signed ()); | |
1509 | } | |
1510 | else if (insn.opcode () == riscv_insn::ADDI) | |
1511 | { | |
1512 | /* Handle: addi REG1, REG2, IMM */ | |
1513 | gdb_assert (insn.rd () < RISCV_NUM_INTEGER_REGS); | |
1514 | gdb_assert (insn.rs1 () < RISCV_NUM_INTEGER_REGS); | |
1515 | regs[insn.rd ()] | |
1516 | = pv_add_constant (regs[insn.rs1 ()], insn.imm_signed ()); | |
1517 | } | |
1518 | else if (insn.opcode () == riscv_insn::ADD) | |
1519 | { | |
1520 | /* Handle: addi REG1, REG2, IMM */ | |
1521 | gdb_assert (insn.rd () < RISCV_NUM_INTEGER_REGS); | |
1522 | gdb_assert (insn.rs1 () < RISCV_NUM_INTEGER_REGS); | |
1523 | gdb_assert (insn.rs2 () < RISCV_NUM_INTEGER_REGS); | |
1524 | regs[insn.rd ()] = pv_add (regs[insn.rs1 ()], regs[insn.rs2 ()]); | |
1525 | } | |
dbbb1059 AB |
1526 | else |
1527 | { | |
78a3b0fa AB |
1528 | end_prologue_addr = cur_pc; |
1529 | break; | |
dbbb1059 AB |
1530 | } |
1531 | } | |
1532 | ||
1533 | if (end_prologue_addr == 0) | |
1534 | end_prologue_addr = cur_pc; | |
1535 | ||
78a3b0fa AB |
1536 | if (riscv_debug_unwinder) |
1537 | fprintf_unfiltered (gdb_stdlog, "End of prologue at %s\n", | |
1538 | core_addr_to_string (end_prologue_addr)); | |
1539 | ||
1540 | if (cache != NULL) | |
1541 | { | |
1542 | /* Figure out if it is a frame pointer or just a stack pointer. Also | |
1543 | the offset held in the pv_t is from the original register value to | |
1544 | the current value, which for a grows down stack means a negative | |
1545 | value. The FRAME_BASE_OFFSET is the negation of this, how to get | |
1546 | from the current value to the original value. */ | |
1547 | if (pv_is_register (regs[RISCV_FP_REGNUM], RISCV_SP_REGNUM)) | |
1548 | { | |
1549 | cache->frame_base_reg = RISCV_FP_REGNUM; | |
1550 | cache->frame_base_offset = -regs[RISCV_FP_REGNUM].k; | |
1551 | } | |
1552 | else | |
1553 | { | |
1554 | cache->frame_base_reg = RISCV_SP_REGNUM; | |
1555 | cache->frame_base_offset = -regs[RISCV_SP_REGNUM].k; | |
1556 | } | |
1557 | ||
1558 | /* Assign offset from old SP to all saved registers. As we don't | |
1559 | have the previous value for the frame base register at this | |
1560 | point, we store the offset as the address in the trad_frame, and | |
1561 | then convert this to an actual address later. */ | |
1562 | for (int i = 0; i <= RISCV_NUM_INTEGER_REGS; i++) | |
1563 | { | |
1564 | CORE_ADDR offset; | |
1565 | if (stack.find_reg (gdbarch, i, &offset)) | |
1566 | { | |
1567 | if (riscv_debug_unwinder) | |
a96bd1cc AB |
1568 | { |
1569 | /* Display OFFSET as a signed value, the offsets are from | |
1570 | the frame base address to the registers location on | |
1571 | the stack, with a descending stack this means the | |
1572 | offsets are always negative. */ | |
1573 | fprintf_unfiltered (gdb_stdlog, | |
1574 | "Register $%s at stack offset %s\n", | |
1575 | gdbarch_register_name (gdbarch, i), | |
1576 | plongest ((LONGEST) offset)); | |
1577 | } | |
78a3b0fa AB |
1578 | trad_frame_set_addr (cache->regs, i, offset); |
1579 | } | |
1580 | } | |
1581 | } | |
1582 | ||
dbbb1059 AB |
1583 | return end_prologue_addr; |
1584 | } | |
1585 | ||
1586 | /* Implement the riscv_skip_prologue gdbarch method. */ | |
1587 | ||
1588 | static CORE_ADDR | |
78a3b0fa | 1589 | riscv_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc) |
dbbb1059 | 1590 | { |
dbbb1059 AB |
1591 | CORE_ADDR func_addr; |
1592 | ||
1593 | /* See if we can determine the end of the prologue via the symbol | |
1594 | table. If so, then return either PC, or the PC after the | |
1595 | prologue, whichever is greater. */ | |
1596 | if (find_pc_partial_function (pc, NULL, &func_addr, NULL)) | |
1597 | { | |
1598 | CORE_ADDR post_prologue_pc | |
1599 | = skip_prologue_using_sal (gdbarch, func_addr); | |
1600 | ||
1601 | if (post_prologue_pc != 0) | |
1602 | return std::max (pc, post_prologue_pc); | |
1603 | } | |
1604 | ||
1605 | /* Can't determine prologue from the symbol table, need to examine | |
78a3b0fa AB |
1606 | instructions. Pass -1 for the end address to indicate the prologue |
1607 | scanner can scan as far as it needs to find the end of the prologue. */ | |
1608 | return riscv_scan_prologue (gdbarch, pc, ((CORE_ADDR) -1), NULL); | |
dbbb1059 AB |
1609 | } |
1610 | ||
1611 | /* Implement the gdbarch push dummy code callback. */ | |
1612 | ||
1613 | static CORE_ADDR | |
1614 | riscv_push_dummy_code (struct gdbarch *gdbarch, CORE_ADDR sp, | |
1615 | CORE_ADDR funaddr, struct value **args, int nargs, | |
1616 | struct type *value_type, CORE_ADDR *real_pc, | |
1617 | CORE_ADDR *bp_addr, struct regcache *regcache) | |
1618 | { | |
01e175fe AB |
1619 | /* A nop instruction is 'add x0, x0, 0'. */ |
1620 | static const gdb_byte nop_insn[] = { 0x13, 0x00, 0x00, 0x00 }; | |
1621 | ||
dbbb1059 | 1622 | /* Allocate space for a breakpoint, and keep the stack correctly |
01e175fe AB |
1623 | aligned. The space allocated here must be at least big enough to |
1624 | accommodate the NOP_INSN defined above. */ | |
dbbb1059 AB |
1625 | sp -= 16; |
1626 | *bp_addr = sp; | |
1627 | *real_pc = funaddr; | |
01e175fe AB |
1628 | |
1629 | /* When we insert a breakpoint we select whether to use a compressed | |
1630 | breakpoint or not based on the existing contents of the memory. | |
1631 | ||
1632 | If the breakpoint is being placed onto the stack as part of setting up | |
1633 | for an inferior call from GDB, then the existing stack contents may | |
1634 | randomly appear to be a compressed instruction, causing GDB to insert | |
1635 | a compressed breakpoint. If this happens on a target that does not | |
1636 | support compressed instructions then this could cause problems. | |
1637 | ||
1638 | To prevent this issue we write an uncompressed nop onto the stack at | |
1639 | the location where the breakpoint will be inserted. In this way we | |
1640 | ensure that we always use an uncompressed breakpoint, which should | |
1641 | work on all targets. | |
1642 | ||
1643 | We call TARGET_WRITE_MEMORY here so that if the write fails we don't | |
1644 | throw an exception. Instead we ignore the error and move on. The | |
1645 | assumption is that either GDB will error later when actually trying to | |
1646 | insert a software breakpoint, or GDB will use hardware breakpoints and | |
1647 | there will be no need to write to memory later. */ | |
1648 | int status = target_write_memory (*bp_addr, nop_insn, sizeof (nop_insn)); | |
1649 | ||
1650 | if (riscv_debug_breakpoints || riscv_debug_infcall) | |
1651 | fprintf_unfiltered (gdb_stdlog, | |
a83d4ef6 JW |
1652 | "Writing %s-byte nop instruction to %s: %s\n", |
1653 | plongest (sizeof (nop_insn)), | |
01e175fe AB |
1654 | paddress (gdbarch, *bp_addr), |
1655 | (status == 0 ? "success" : "failed")); | |
1656 | ||
dbbb1059 AB |
1657 | return sp; |
1658 | } | |
1659 | ||
a9158a86 AB |
1660 | /* Implement the gdbarch type alignment method, overrides the generic |
1661 | alignment algorithm for anything that is RISC-V specific. */ | |
dbbb1059 | 1662 | |
a9158a86 AB |
1663 | static ULONGEST |
1664 | riscv_type_align (gdbarch *gdbarch, type *type) | |
dbbb1059 | 1665 | { |
a9158a86 AB |
1666 | type = check_typedef (type); |
1667 | if (TYPE_CODE (type) == TYPE_CODE_ARRAY && TYPE_VECTOR (type)) | |
1668 | return std::min (TYPE_LENGTH (type), (ULONGEST) BIGGEST_ALIGNMENT); | |
dbbb1059 | 1669 | |
a9158a86 AB |
1670 | /* Anything else will be aligned by the generic code. */ |
1671 | return 0; | |
dbbb1059 AB |
1672 | } |
1673 | ||
1674 | /* Holds information about a single argument either being passed to an | |
1675 | inferior function, or returned from an inferior function. This includes | |
1676 | information about the size, type, etc of the argument, and also | |
1677 | information about how the argument will be passed (or returned). */ | |
1678 | ||
1679 | struct riscv_arg_info | |
1680 | { | |
1681 | /* Contents of the argument. */ | |
1682 | const gdb_byte *contents; | |
1683 | ||
1684 | /* Length of argument. */ | |
1685 | int length; | |
1686 | ||
1687 | /* Alignment required for an argument of this type. */ | |
1688 | int align; | |
1689 | ||
1690 | /* The type for this argument. */ | |
1691 | struct type *type; | |
1692 | ||
1693 | /* Each argument can have either 1 or 2 locations assigned to it. Each | |
1694 | location describes where part of the argument will be placed. The | |
1695 | second location is valid based on the LOC_TYPE and C_LENGTH fields | |
1696 | of the first location (which is always valid). */ | |
1697 | struct location | |
1698 | { | |
1699 | /* What type of location this is. */ | |
1700 | enum location_type | |
1701 | { | |
1702 | /* Argument passed in a register. */ | |
1703 | in_reg, | |
1704 | ||
1705 | /* Argument passed as an on stack argument. */ | |
1706 | on_stack, | |
1707 | ||
1708 | /* Argument passed by reference. The second location is always | |
1709 | valid for a BY_REF argument, and describes where the address | |
1710 | of the BY_REF argument should be placed. */ | |
1711 | by_ref | |
1712 | } loc_type; | |
1713 | ||
1714 | /* Information that depends on the location type. */ | |
1715 | union | |
1716 | { | |
1717 | /* Which register number to use. */ | |
1718 | int regno; | |
1719 | ||
1720 | /* The offset into the stack region. */ | |
1721 | int offset; | |
1722 | } loc_data; | |
1723 | ||
1724 | /* The length of contents covered by this location. If this is less | |
1725 | than the total length of the argument, then the second location | |
1726 | will be valid, and will describe where the rest of the argument | |
1727 | will go. */ | |
1728 | int c_length; | |
1729 | ||
dd895392 AB |
1730 | /* The offset within CONTENTS for this part of the argument. This can |
1731 | be non-zero even for the first part (the first field of a struct can | |
1732 | have a non-zero offset due to padding). For the second part of the | |
dbbb1059 AB |
1733 | argument, this might be the C_LENGTH value of the first part, |
1734 | however, if we are passing a structure in two registers, and there's | |
1735 | is padding between the first and second field, then this offset | |
1736 | might be greater than the length of the first argument part. When | |
1737 | the second argument location is not holding part of the argument | |
1738 | value, but is instead holding the address of a reference argument, | |
1739 | then this offset will be set to 0. */ | |
1740 | int c_offset; | |
1741 | } argloc[2]; | |
8b2d40cb JW |
1742 | |
1743 | /* TRUE if this is an unnamed argument. */ | |
1744 | bool is_unnamed; | |
dbbb1059 AB |
1745 | }; |
1746 | ||
1747 | /* Information about a set of registers being used for passing arguments as | |
1748 | part of a function call. The register set must be numerically | |
1749 | sequential from NEXT_REGNUM to LAST_REGNUM. The register set can be | |
1750 | disabled from use by setting NEXT_REGNUM greater than LAST_REGNUM. */ | |
1751 | ||
1752 | struct riscv_arg_reg | |
1753 | { | |
1754 | riscv_arg_reg (int first, int last) | |
1755 | : next_regnum (first), | |
1756 | last_regnum (last) | |
1757 | { | |
1758 | /* Nothing. */ | |
1759 | } | |
1760 | ||
1761 | /* The GDB register number to use in this set. */ | |
1762 | int next_regnum; | |
1763 | ||
1764 | /* The last GDB register number to use in this set. */ | |
1765 | int last_regnum; | |
1766 | }; | |
1767 | ||
1768 | /* Arguments can be passed as on stack arguments, or by reference. The | |
1769 | on stack arguments must be in a continuous region starting from $sp, | |
1770 | while the by reference arguments can be anywhere, but we'll put them | |
1771 | on the stack after (at higher address) the on stack arguments. | |
1772 | ||
1773 | This might not be the right approach to take. The ABI is clear that | |
1774 | an argument passed by reference can be modified by the callee, which | |
1775 | us placing the argument (temporarily) onto the stack will not achieve | |
1776 | (changes will be lost). There's also the possibility that very large | |
1777 | arguments could overflow the stack. | |
1778 | ||
1779 | This struct is used to track offset into these two areas for where | |
1780 | arguments are to be placed. */ | |
1781 | struct riscv_memory_offsets | |
1782 | { | |
1783 | riscv_memory_offsets () | |
1784 | : arg_offset (0), | |
1785 | ref_offset (0) | |
1786 | { | |
1787 | /* Nothing. */ | |
1788 | } | |
1789 | ||
1790 | /* Offset into on stack argument area. */ | |
1791 | int arg_offset; | |
1792 | ||
1793 | /* Offset into the pass by reference area. */ | |
1794 | int ref_offset; | |
1795 | }; | |
1796 | ||
1797 | /* Holds information about where arguments to a call will be placed. This | |
1798 | is updated as arguments are added onto the call, and can be used to | |
1799 | figure out where the next argument should be placed. */ | |
1800 | ||
1801 | struct riscv_call_info | |
1802 | { | |
1803 | riscv_call_info (struct gdbarch *gdbarch) | |
1804 | : int_regs (RISCV_A0_REGNUM, RISCV_A0_REGNUM + 7), | |
1805 | float_regs (RISCV_FA0_REGNUM, RISCV_FA0_REGNUM + 7) | |
1806 | { | |
113b7b81 AB |
1807 | xlen = riscv_abi_xlen (gdbarch); |
1808 | flen = riscv_abi_flen (gdbarch); | |
dbbb1059 AB |
1809 | |
1810 | /* Disable use of floating point registers if needed. */ | |
1811 | if (!riscv_has_fp_abi (gdbarch)) | |
1812 | float_regs.next_regnum = float_regs.last_regnum + 1; | |
1813 | } | |
1814 | ||
1815 | /* Track the memory areas used for holding in-memory arguments to a | |
1816 | call. */ | |
1817 | struct riscv_memory_offsets memory; | |
1818 | ||
1819 | /* Holds information about the next integer register to use for passing | |
1820 | an argument. */ | |
1821 | struct riscv_arg_reg int_regs; | |
1822 | ||
1823 | /* Holds information about the next floating point register to use for | |
1824 | passing an argument. */ | |
1825 | struct riscv_arg_reg float_regs; | |
1826 | ||
1827 | /* The XLEN and FLEN are copied in to this structure for convenience, and | |
113b7b81 | 1828 | are just the results of calling RISCV_ABI_XLEN and RISCV_ABI_FLEN. */ |
dbbb1059 AB |
1829 | int xlen; |
1830 | int flen; | |
1831 | }; | |
1832 | ||
1833 | /* Return the number of registers available for use as parameters in the | |
1834 | register set REG. Returned value can be 0 or more. */ | |
1835 | ||
1836 | static int | |
1837 | riscv_arg_regs_available (struct riscv_arg_reg *reg) | |
1838 | { | |
1839 | if (reg->next_regnum > reg->last_regnum) | |
1840 | return 0; | |
1841 | ||
1842 | return (reg->last_regnum - reg->next_regnum + 1); | |
1843 | } | |
1844 | ||
1845 | /* If there is at least one register available in the register set REG then | |
1846 | the next register from REG is assigned to LOC and the length field of | |
1847 | LOC is updated to LENGTH. The register set REG is updated to indicate | |
1848 | that the assigned register is no longer available and the function | |
1849 | returns true. | |
1850 | ||
1851 | If there are no registers available in REG then the function returns | |
1852 | false, and LOC and REG are unchanged. */ | |
1853 | ||
1854 | static bool | |
1855 | riscv_assign_reg_location (struct riscv_arg_info::location *loc, | |
1856 | struct riscv_arg_reg *reg, | |
1857 | int length, int offset) | |
1858 | { | |
1859 | if (reg->next_regnum <= reg->last_regnum) | |
1860 | { | |
1861 | loc->loc_type = riscv_arg_info::location::in_reg; | |
1862 | loc->loc_data.regno = reg->next_regnum; | |
1863 | reg->next_regnum++; | |
1864 | loc->c_length = length; | |
1865 | loc->c_offset = offset; | |
1866 | return true; | |
1867 | } | |
1868 | ||
1869 | return false; | |
1870 | } | |
1871 | ||
1872 | /* Assign LOC a location as the next stack parameter, and update MEMORY to | |
1873 | record that an area of stack has been used to hold the parameter | |
1874 | described by LOC. | |
1875 | ||
1876 | The length field of LOC is updated to LENGTH, the length of the | |
1877 | parameter being stored, and ALIGN is the alignment required by the | |
1878 | parameter, which will affect how memory is allocated out of MEMORY. */ | |
1879 | ||
1880 | static void | |
1881 | riscv_assign_stack_location (struct riscv_arg_info::location *loc, | |
1882 | struct riscv_memory_offsets *memory, | |
1883 | int length, int align) | |
1884 | { | |
1885 | loc->loc_type = riscv_arg_info::location::on_stack; | |
1886 | memory->arg_offset | |
1887 | = align_up (memory->arg_offset, align); | |
1888 | loc->loc_data.offset = memory->arg_offset; | |
1889 | memory->arg_offset += length; | |
1890 | loc->c_length = length; | |
1891 | ||
1892 | /* Offset is always 0, either we're the first location part, in which | |
1893 | case we're reading content from the start of the argument, or we're | |
1894 | passing the address of a reference argument, so 0. */ | |
1895 | loc->c_offset = 0; | |
1896 | } | |
1897 | ||
1898 | /* Update AINFO, which describes an argument that should be passed or | |
1899 | returned using the integer ABI. The argloc fields within AINFO are | |
1900 | updated to describe the location in which the argument will be passed to | |
1901 | a function, or returned from a function. | |
1902 | ||
1903 | The CINFO structure contains the ongoing call information, the holds | |
1904 | information such as which argument registers are remaining to be | |
1905 | assigned to parameter, and how much memory has been used by parameters | |
1906 | so far. | |
1907 | ||
1908 | By examining the state of CINFO a suitable location can be selected, | |
1909 | and assigned to AINFO. */ | |
1910 | ||
1911 | static void | |
1912 | riscv_call_arg_scalar_int (struct riscv_arg_info *ainfo, | |
1913 | struct riscv_call_info *cinfo) | |
1914 | { | |
1915 | if (ainfo->length > (2 * cinfo->xlen)) | |
1916 | { | |
1917 | /* Argument is going to be passed by reference. */ | |
1918 | ainfo->argloc[0].loc_type | |
1919 | = riscv_arg_info::location::by_ref; | |
1920 | cinfo->memory.ref_offset | |
1921 | = align_up (cinfo->memory.ref_offset, ainfo->align); | |
1922 | ainfo->argloc[0].loc_data.offset = cinfo->memory.ref_offset; | |
1923 | cinfo->memory.ref_offset += ainfo->length; | |
1924 | ainfo->argloc[0].c_length = ainfo->length; | |
1925 | ||
1926 | /* The second location for this argument is given over to holding the | |
1927 | address of the by-reference data. Pass 0 for the offset as this | |
1928 | is not part of the actual argument value. */ | |
1929 | if (!riscv_assign_reg_location (&ainfo->argloc[1], | |
1930 | &cinfo->int_regs, | |
1931 | cinfo->xlen, 0)) | |
1932 | riscv_assign_stack_location (&ainfo->argloc[1], | |
1933 | &cinfo->memory, cinfo->xlen, | |
1934 | cinfo->xlen); | |
1935 | } | |
1936 | else | |
1937 | { | |
174f8ac8 JW |
1938 | int len = std::min (ainfo->length, cinfo->xlen); |
1939 | int align = std::max (ainfo->align, cinfo->xlen); | |
dbbb1059 | 1940 | |
8b2d40cb JW |
1941 | /* Unnamed arguments in registers that require 2*XLEN alignment are |
1942 | passed in an aligned register pair. */ | |
1943 | if (ainfo->is_unnamed && (align == cinfo->xlen * 2) | |
1944 | && cinfo->int_regs.next_regnum & 1) | |
1945 | cinfo->int_regs.next_regnum++; | |
1946 | ||
dbbb1059 AB |
1947 | if (!riscv_assign_reg_location (&ainfo->argloc[0], |
1948 | &cinfo->int_regs, len, 0)) | |
1949 | riscv_assign_stack_location (&ainfo->argloc[0], | |
174f8ac8 | 1950 | &cinfo->memory, len, align); |
dbbb1059 AB |
1951 | |
1952 | if (len < ainfo->length) | |
1953 | { | |
1954 | len = ainfo->length - len; | |
1955 | if (!riscv_assign_reg_location (&ainfo->argloc[1], | |
1956 | &cinfo->int_regs, len, | |
1957 | cinfo->xlen)) | |
1958 | riscv_assign_stack_location (&ainfo->argloc[1], | |
1959 | &cinfo->memory, len, cinfo->xlen); | |
1960 | } | |
1961 | } | |
1962 | } | |
1963 | ||
1964 | /* Like RISCV_CALL_ARG_SCALAR_INT, except the argument described by AINFO | |
1965 | is being passed with the floating point ABI. */ | |
1966 | ||
1967 | static void | |
1968 | riscv_call_arg_scalar_float (struct riscv_arg_info *ainfo, | |
1969 | struct riscv_call_info *cinfo) | |
1970 | { | |
4de3d8d0 | 1971 | if (ainfo->length > cinfo->flen || ainfo->is_unnamed) |
dbbb1059 AB |
1972 | return riscv_call_arg_scalar_int (ainfo, cinfo); |
1973 | else | |
1974 | { | |
1975 | if (!riscv_assign_reg_location (&ainfo->argloc[0], | |
1976 | &cinfo->float_regs, | |
1977 | ainfo->length, 0)) | |
1978 | return riscv_call_arg_scalar_int (ainfo, cinfo); | |
1979 | } | |
1980 | } | |
1981 | ||
1982 | /* Like RISCV_CALL_ARG_SCALAR_INT, except the argument described by AINFO | |
1983 | is a complex floating point argument, and is therefore handled | |
1984 | differently to other argument types. */ | |
1985 | ||
1986 | static void | |
1987 | riscv_call_arg_complex_float (struct riscv_arg_info *ainfo, | |
1988 | struct riscv_call_info *cinfo) | |
1989 | { | |
1990 | if (ainfo->length <= (2 * cinfo->flen) | |
4de3d8d0 AB |
1991 | && riscv_arg_regs_available (&cinfo->float_regs) >= 2 |
1992 | && !ainfo->is_unnamed) | |
dbbb1059 AB |
1993 | { |
1994 | bool result; | |
1995 | int len = ainfo->length / 2; | |
1996 | ||
1997 | result = riscv_assign_reg_location (&ainfo->argloc[0], | |
9f0272f8 | 1998 | &cinfo->float_regs, len, 0); |
dbbb1059 AB |
1999 | gdb_assert (result); |
2000 | ||
2001 | result = riscv_assign_reg_location (&ainfo->argloc[1], | |
2002 | &cinfo->float_regs, len, len); | |
2003 | gdb_assert (result); | |
2004 | } | |
2005 | else | |
2006 | return riscv_call_arg_scalar_int (ainfo, cinfo); | |
2007 | } | |
2008 | ||
2009 | /* A structure used for holding information about a structure type within | |
2010 | the inferior program. The RiscV ABI has special rules for handling some | |
2011 | structures with a single field or with two fields. The counting of | |
2012 | fields here is done after flattening out all nested structures. */ | |
2013 | ||
2014 | class riscv_struct_info | |
2015 | { | |
2016 | public: | |
2017 | riscv_struct_info () | |
2018 | : m_number_of_fields (0), | |
9f0272f8 AB |
2019 | m_types { nullptr, nullptr }, |
2020 | m_offsets { 0, 0 } | |
dbbb1059 AB |
2021 | { |
2022 | /* Nothing. */ | |
2023 | } | |
2024 | ||
2025 | /* Analyse TYPE descending into nested structures, count the number of | |
2026 | scalar fields and record the types of the first two fields found. */ | |
9f0272f8 AB |
2027 | void analyse (struct type *type) |
2028 | { | |
2029 | analyse_inner (type, 0); | |
2030 | } | |
dbbb1059 AB |
2031 | |
2032 | /* The number of scalar fields found in the analysed type. This is | |
2033 | currently only accurate if the value returned is 0, 1, or 2 as the | |
2034 | analysis stops counting when the number of fields is 3. This is | |
2035 | because the RiscV ABI only has special cases for 1 or 2 fields, | |
2036 | anything else we just don't care about. */ | |
2037 | int number_of_fields () const | |
2038 | { return m_number_of_fields; } | |
2039 | ||
2040 | /* Return the type for scalar field INDEX within the analysed type. Will | |
2041 | return nullptr if there is no field at that index. Only INDEX values | |
2042 | 0 and 1 can be requested as the RiscV ABI only has special cases for | |
2043 | structures with 1 or 2 fields. */ | |
2044 | struct type *field_type (int index) const | |
2045 | { | |
2046 | gdb_assert (index < (sizeof (m_types) / sizeof (m_types[0]))); | |
2047 | return m_types[index]; | |
2048 | } | |
2049 | ||
9f0272f8 AB |
2050 | /* Return the offset of scalar field INDEX within the analysed type. Will |
2051 | return 0 if there is no field at that index. Only INDEX values 0 and | |
2052 | 1 can be requested as the RiscV ABI only has special cases for | |
2053 | structures with 1 or 2 fields. */ | |
2054 | int field_offset (int index) const | |
2055 | { | |
2056 | gdb_assert (index < (sizeof (m_offsets) / sizeof (m_offsets[0]))); | |
2057 | return m_offsets[index]; | |
2058 | } | |
2059 | ||
dbbb1059 AB |
2060 | private: |
2061 | /* The number of scalar fields found within the structure after recursing | |
2062 | into nested structures. */ | |
2063 | int m_number_of_fields; | |
2064 | ||
2065 | /* The types of the first two scalar fields found within the structure | |
2066 | after recursing into nested structures. */ | |
2067 | struct type *m_types[2]; | |
9f0272f8 AB |
2068 | |
2069 | /* The offsets of the first two scalar fields found within the structure | |
2070 | after recursing into nested structures. */ | |
2071 | int m_offsets[2]; | |
2072 | ||
2073 | /* Recursive core for ANALYSE, the OFFSET parameter tracks the byte | |
2074 | offset from the start of the top level structure being analysed. */ | |
2075 | void analyse_inner (struct type *type, int offset); | |
dbbb1059 AB |
2076 | }; |
2077 | ||
9f0272f8 | 2078 | /* See description in class declaration. */ |
dbbb1059 AB |
2079 | |
2080 | void | |
9f0272f8 | 2081 | riscv_struct_info::analyse_inner (struct type *type, int offset) |
dbbb1059 AB |
2082 | { |
2083 | unsigned int count = TYPE_NFIELDS (type); | |
2084 | unsigned int i; | |
2085 | ||
2086 | for (i = 0; i < count; ++i) | |
2087 | { | |
2088 | if (TYPE_FIELD_LOC_KIND (type, i) != FIELD_LOC_KIND_BITPOS) | |
2089 | continue; | |
2090 | ||
2091 | struct type *field_type = TYPE_FIELD_TYPE (type, i); | |
2092 | field_type = check_typedef (field_type); | |
9f0272f8 AB |
2093 | int field_offset |
2094 | = offset + TYPE_FIELD_BITPOS (type, i) / TARGET_CHAR_BIT; | |
dbbb1059 AB |
2095 | |
2096 | switch (TYPE_CODE (field_type)) | |
2097 | { | |
2098 | case TYPE_CODE_STRUCT: | |
9f0272f8 | 2099 | analyse_inner (field_type, field_offset); |
dbbb1059 AB |
2100 | break; |
2101 | ||
2102 | default: | |
2103 | /* RiscV only flattens out structures. Anything else does not | |
2104 | need to be flattened, we just record the type, and when we | |
2105 | look at the analysis results we'll realise this is not a | |
2106 | structure we can special case, and pass the structure in | |
2107 | memory. */ | |
2108 | if (m_number_of_fields < 2) | |
9f0272f8 AB |
2109 | { |
2110 | m_types[m_number_of_fields] = field_type; | |
2111 | m_offsets[m_number_of_fields] = field_offset; | |
2112 | } | |
dbbb1059 AB |
2113 | m_number_of_fields++; |
2114 | break; | |
2115 | } | |
2116 | ||
2117 | /* RiscV only has special handling for structures with 1 or 2 scalar | |
2118 | fields, any more than that and the structure is just passed in | |
2119 | memory. We can safely drop out early when we find 3 or more | |
2120 | fields then. */ | |
2121 | ||
2122 | if (m_number_of_fields > 2) | |
2123 | return; | |
2124 | } | |
2125 | } | |
2126 | ||
2127 | /* Like RISCV_CALL_ARG_SCALAR_INT, except the argument described by AINFO | |
2128 | is a structure. Small structures on RiscV have some special case | |
2129 | handling in order that the structure might be passed in register. | |
2130 | Larger structures are passed in memory. After assigning location | |
2131 | information to AINFO, CINFO will have been updated. */ | |
2132 | ||
2133 | static void | |
2134 | riscv_call_arg_struct (struct riscv_arg_info *ainfo, | |
2135 | struct riscv_call_info *cinfo) | |
2136 | { | |
2137 | if (riscv_arg_regs_available (&cinfo->float_regs) >= 1) | |
2138 | { | |
2139 | struct riscv_struct_info sinfo; | |
2140 | ||
2141 | sinfo.analyse (ainfo->type); | |
2142 | if (sinfo.number_of_fields () == 1 | |
2143 | && TYPE_CODE (sinfo.field_type (0)) == TYPE_CODE_COMPLEX) | |
2144 | { | |
9f0272f8 AB |
2145 | /* The following is similar to RISCV_CALL_ARG_COMPLEX_FLOAT, |
2146 | except we use the type of the complex field instead of the | |
2147 | type from AINFO, and the first location might be at a non-zero | |
2148 | offset. */ | |
2149 | if (TYPE_LENGTH (sinfo.field_type (0)) <= (2 * cinfo->flen) | |
2150 | && riscv_arg_regs_available (&cinfo->float_regs) >= 2 | |
2151 | && !ainfo->is_unnamed) | |
2152 | { | |
2153 | bool result; | |
2154 | int len = TYPE_LENGTH (sinfo.field_type (0)) / 2; | |
2155 | int offset = sinfo.field_offset (0); | |
2156 | ||
2157 | result = riscv_assign_reg_location (&ainfo->argloc[0], | |
2158 | &cinfo->float_regs, len, | |
2159 | offset); | |
2160 | gdb_assert (result); | |
2161 | ||
2162 | result = riscv_assign_reg_location (&ainfo->argloc[1], | |
2163 | &cinfo->float_regs, len, | |
2164 | (offset + len)); | |
2165 | gdb_assert (result); | |
2166 | } | |
2167 | else | |
2168 | riscv_call_arg_scalar_int (ainfo, cinfo); | |
2169 | return; | |
dbbb1059 AB |
2170 | } |
2171 | ||
2172 | if (sinfo.number_of_fields () == 1 | |
2173 | && TYPE_CODE (sinfo.field_type (0)) == TYPE_CODE_FLT) | |
2174 | { | |
9f0272f8 AB |
2175 | /* The following is similar to RISCV_CALL_ARG_SCALAR_FLOAT, |
2176 | except we use the type of the first scalar field instead of | |
2177 | the type from AINFO. Also the location might be at a non-zero | |
2178 | offset. */ | |
2179 | if (TYPE_LENGTH (sinfo.field_type (0)) > cinfo->flen | |
2180 | || ainfo->is_unnamed) | |
2181 | riscv_call_arg_scalar_int (ainfo, cinfo); | |
2182 | else | |
2183 | { | |
2184 | int offset = sinfo.field_offset (0); | |
2185 | int len = TYPE_LENGTH (sinfo.field_type (0)); | |
2186 | ||
2187 | if (!riscv_assign_reg_location (&ainfo->argloc[0], | |
2188 | &cinfo->float_regs, | |
2189 | len, offset)) | |
2190 | riscv_call_arg_scalar_int (ainfo, cinfo); | |
2191 | } | |
2192 | return; | |
dbbb1059 AB |
2193 | } |
2194 | ||
2195 | if (sinfo.number_of_fields () == 2 | |
2196 | && TYPE_CODE (sinfo.field_type (0)) == TYPE_CODE_FLT | |
2197 | && TYPE_LENGTH (sinfo.field_type (0)) <= cinfo->flen | |
2198 | && TYPE_CODE (sinfo.field_type (1)) == TYPE_CODE_FLT | |
2199 | && TYPE_LENGTH (sinfo.field_type (1)) <= cinfo->flen | |
2200 | && riscv_arg_regs_available (&cinfo->float_regs) >= 2) | |
2201 | { | |
9f0272f8 AB |
2202 | int len0 = TYPE_LENGTH (sinfo.field_type (0)); |
2203 | int offset = sinfo.field_offset (0); | |
dbbb1059 | 2204 | if (!riscv_assign_reg_location (&ainfo->argloc[0], |
9f0272f8 | 2205 | &cinfo->float_regs, len0, offset)) |
dbbb1059 AB |
2206 | error (_("failed during argument setup")); |
2207 | ||
9f0272f8 AB |
2208 | int len1 = TYPE_LENGTH (sinfo.field_type (1)); |
2209 | offset = sinfo.field_offset (1); | |
dbbb1059 AB |
2210 | gdb_assert (len1 <= (TYPE_LENGTH (ainfo->type) |
2211 | - TYPE_LENGTH (sinfo.field_type (0)))); | |
2212 | ||
2213 | if (!riscv_assign_reg_location (&ainfo->argloc[1], | |
2214 | &cinfo->float_regs, | |
2215 | len1, offset)) | |
2216 | error (_("failed during argument setup")); | |
2217 | return; | |
2218 | } | |
2219 | ||
2220 | if (sinfo.number_of_fields () == 2 | |
2221 | && riscv_arg_regs_available (&cinfo->int_regs) >= 1 | |
2222 | && (TYPE_CODE (sinfo.field_type (0)) == TYPE_CODE_FLT | |
2223 | && TYPE_LENGTH (sinfo.field_type (0)) <= cinfo->flen | |
2224 | && is_integral_type (sinfo.field_type (1)) | |
2225 | && TYPE_LENGTH (sinfo.field_type (1)) <= cinfo->xlen)) | |
2226 | { | |
9f0272f8 AB |
2227 | int len0 = TYPE_LENGTH (sinfo.field_type (0)); |
2228 | int offset = sinfo.field_offset (0); | |
dbbb1059 | 2229 | if (!riscv_assign_reg_location (&ainfo->argloc[0], |
9f0272f8 | 2230 | &cinfo->float_regs, len0, offset)) |
dbbb1059 AB |
2231 | error (_("failed during argument setup")); |
2232 | ||
9f0272f8 AB |
2233 | int len1 = TYPE_LENGTH (sinfo.field_type (1)); |
2234 | offset = sinfo.field_offset (1); | |
dbbb1059 AB |
2235 | gdb_assert (len1 <= cinfo->xlen); |
2236 | if (!riscv_assign_reg_location (&ainfo->argloc[1], | |
2237 | &cinfo->int_regs, len1, offset)) | |
2238 | error (_("failed during argument setup")); | |
2239 | return; | |
2240 | } | |
2241 | ||
2242 | if (sinfo.number_of_fields () == 2 | |
2243 | && riscv_arg_regs_available (&cinfo->int_regs) >= 1 | |
2244 | && (is_integral_type (sinfo.field_type (0)) | |
2245 | && TYPE_LENGTH (sinfo.field_type (0)) <= cinfo->xlen | |
2246 | && TYPE_CODE (sinfo.field_type (1)) == TYPE_CODE_FLT | |
2247 | && TYPE_LENGTH (sinfo.field_type (1)) <= cinfo->flen)) | |
2248 | { | |
9f0272f8 AB |
2249 | int len0 = TYPE_LENGTH (sinfo.field_type (0)); |
2250 | int len1 = TYPE_LENGTH (sinfo.field_type (1)); | |
dbbb1059 AB |
2251 | |
2252 | gdb_assert (len0 <= cinfo->xlen); | |
2253 | gdb_assert (len1 <= cinfo->flen); | |
2254 | ||
9f0272f8 | 2255 | int offset = sinfo.field_offset (0); |
dbbb1059 | 2256 | if (!riscv_assign_reg_location (&ainfo->argloc[0], |
9f0272f8 | 2257 | &cinfo->int_regs, len0, offset)) |
dbbb1059 AB |
2258 | error (_("failed during argument setup")); |
2259 | ||
9f0272f8 | 2260 | offset = sinfo.field_offset (1); |
dbbb1059 AB |
2261 | if (!riscv_assign_reg_location (&ainfo->argloc[1], |
2262 | &cinfo->float_regs, | |
2263 | len1, offset)) | |
2264 | error (_("failed during argument setup")); | |
2265 | ||
2266 | return; | |
2267 | } | |
2268 | } | |
2269 | ||
2270 | /* Non of the structure flattening cases apply, so we just pass using | |
2271 | the integer ABI. */ | |
dbbb1059 AB |
2272 | riscv_call_arg_scalar_int (ainfo, cinfo); |
2273 | } | |
2274 | ||
2275 | /* Assign a location to call (or return) argument AINFO, the location is | |
2276 | selected from CINFO which holds information about what call argument | |
2277 | locations are available for use next. The TYPE is the type of the | |
2278 | argument being passed, this information is recorded into AINFO (along | |
8b2d40cb JW |
2279 | with some additional information derived from the type). IS_UNNAMED |
2280 | is true if this is an unnamed (stdarg) argument, this info is also | |
2281 | recorded into AINFO. | |
dbbb1059 AB |
2282 | |
2283 | After assigning a location to AINFO, CINFO will have been updated. */ | |
2284 | ||
2285 | static void | |
2286 | riscv_arg_location (struct gdbarch *gdbarch, | |
2287 | struct riscv_arg_info *ainfo, | |
2288 | struct riscv_call_info *cinfo, | |
8b2d40cb | 2289 | struct type *type, bool is_unnamed) |
dbbb1059 AB |
2290 | { |
2291 | ainfo->type = type; | |
2292 | ainfo->length = TYPE_LENGTH (ainfo->type); | |
a9158a86 | 2293 | ainfo->align = type_align (ainfo->type); |
8b2d40cb | 2294 | ainfo->is_unnamed = is_unnamed; |
dbbb1059 | 2295 | ainfo->contents = nullptr; |
9f0272f8 AB |
2296 | ainfo->argloc[0].c_length = 0; |
2297 | ainfo->argloc[1].c_length = 0; | |
dbbb1059 AB |
2298 | |
2299 | switch (TYPE_CODE (ainfo->type)) | |
2300 | { | |
2301 | case TYPE_CODE_INT: | |
2302 | case TYPE_CODE_BOOL: | |
2303 | case TYPE_CODE_CHAR: | |
2304 | case TYPE_CODE_RANGE: | |
2305 | case TYPE_CODE_ENUM: | |
2306 | case TYPE_CODE_PTR: | |
2307 | if (ainfo->length <= cinfo->xlen) | |
2308 | { | |
2309 | ainfo->type = builtin_type (gdbarch)->builtin_long; | |
2310 | ainfo->length = cinfo->xlen; | |
2311 | } | |
2312 | else if (ainfo->length <= (2 * cinfo->xlen)) | |
2313 | { | |
2314 | ainfo->type = builtin_type (gdbarch)->builtin_long_long; | |
2315 | ainfo->length = 2 * cinfo->xlen; | |
2316 | } | |
2317 | ||
2318 | /* Recalculate the alignment requirement. */ | |
a9158a86 | 2319 | ainfo->align = type_align (ainfo->type); |
dbbb1059 AB |
2320 | riscv_call_arg_scalar_int (ainfo, cinfo); |
2321 | break; | |
2322 | ||
2323 | case TYPE_CODE_FLT: | |
2324 | riscv_call_arg_scalar_float (ainfo, cinfo); | |
2325 | break; | |
2326 | ||
2327 | case TYPE_CODE_COMPLEX: | |
2328 | riscv_call_arg_complex_float (ainfo, cinfo); | |
2329 | break; | |
2330 | ||
2331 | case TYPE_CODE_STRUCT: | |
2332 | riscv_call_arg_struct (ainfo, cinfo); | |
2333 | break; | |
2334 | ||
2335 | default: | |
2336 | riscv_call_arg_scalar_int (ainfo, cinfo); | |
2337 | break; | |
2338 | } | |
2339 | } | |
2340 | ||
cab5bb9d AB |
2341 | /* Used for printing debug information about the call argument location in |
2342 | INFO to STREAM. The addresses in SP_REFS and SP_ARGS are the base | |
2343 | addresses for the location of pass-by-reference and | |
2344 | arguments-on-the-stack memory areas. */ | |
2345 | ||
dbbb1059 | 2346 | static void |
cab5bb9d | 2347 | riscv_print_arg_location (ui_file *stream, struct gdbarch *gdbarch, |
dbbb1059 AB |
2348 | struct riscv_arg_info *info, |
2349 | CORE_ADDR sp_refs, CORE_ADDR sp_args) | |
2350 | { | |
cab5bb9d | 2351 | fprintf_unfiltered (stream, "type: '%s', length: 0x%x, alignment: 0x%x", |
42ecac17 | 2352 | TYPE_SAFE_NAME (info->type), info->length, info->align); |
dbbb1059 AB |
2353 | switch (info->argloc[0].loc_type) |
2354 | { | |
2355 | case riscv_arg_info::location::in_reg: | |
cab5bb9d AB |
2356 | fprintf_unfiltered |
2357 | (stream, ", register %s", | |
2358 | gdbarch_register_name (gdbarch, info->argloc[0].loc_data.regno)); | |
dbbb1059 AB |
2359 | if (info->argloc[0].c_length < info->length) |
2360 | { | |
2361 | switch (info->argloc[1].loc_type) | |
2362 | { | |
2363 | case riscv_arg_info::location::in_reg: | |
cab5bb9d AB |
2364 | fprintf_unfiltered |
2365 | (stream, ", register %s", | |
2366 | gdbarch_register_name (gdbarch, | |
2367 | info->argloc[1].loc_data.regno)); | |
dbbb1059 AB |
2368 | break; |
2369 | ||
2370 | case riscv_arg_info::location::on_stack: | |
cab5bb9d AB |
2371 | fprintf_unfiltered (stream, ", on stack at offset 0x%x", |
2372 | info->argloc[1].loc_data.offset); | |
dbbb1059 AB |
2373 | break; |
2374 | ||
2375 | case riscv_arg_info::location::by_ref: | |
2376 | default: | |
2377 | /* The second location should never be a reference, any | |
2378 | argument being passed by reference just places its address | |
2379 | in the first location and is done. */ | |
2380 | error (_("invalid argument location")); | |
2381 | break; | |
2382 | } | |
2383 | ||
2384 | if (info->argloc[1].c_offset > info->argloc[0].c_length) | |
cab5bb9d AB |
2385 | fprintf_unfiltered (stream, " (offset 0x%x)", |
2386 | info->argloc[1].c_offset); | |
dbbb1059 AB |
2387 | } |
2388 | break; | |
2389 | ||
2390 | case riscv_arg_info::location::on_stack: | |
cab5bb9d AB |
2391 | fprintf_unfiltered (stream, ", on stack at offset 0x%x", |
2392 | info->argloc[0].loc_data.offset); | |
dbbb1059 AB |
2393 | break; |
2394 | ||
2395 | case riscv_arg_info::location::by_ref: | |
cab5bb9d AB |
2396 | fprintf_unfiltered |
2397 | (stream, ", by reference, data at offset 0x%x (%s)", | |
2398 | info->argloc[0].loc_data.offset, | |
2399 | core_addr_to_string (sp_refs + info->argloc[0].loc_data.offset)); | |
dbbb1059 AB |
2400 | if (info->argloc[1].loc_type |
2401 | == riscv_arg_info::location::in_reg) | |
cab5bb9d AB |
2402 | fprintf_unfiltered |
2403 | (stream, ", address in register %s", | |
2404 | gdbarch_register_name (gdbarch, info->argloc[1].loc_data.regno)); | |
dbbb1059 AB |
2405 | else |
2406 | { | |
2407 | gdb_assert (info->argloc[1].loc_type | |
2408 | == riscv_arg_info::location::on_stack); | |
cab5bb9d AB |
2409 | fprintf_unfiltered |
2410 | (stream, ", address on stack at offset 0x%x (%s)", | |
2411 | info->argloc[1].loc_data.offset, | |
2412 | core_addr_to_string (sp_args + info->argloc[1].loc_data.offset)); | |
dbbb1059 AB |
2413 | } |
2414 | break; | |
2415 | ||
2416 | default: | |
89a3b63e | 2417 | gdb_assert_not_reached (_("unknown argument location type")); |
dbbb1059 AB |
2418 | } |
2419 | } | |
2420 | ||
dd895392 AB |
2421 | /* Wrapper around REGCACHE->cooked_write. Places the LEN bytes of DATA |
2422 | into a buffer that is at least as big as the register REGNUM, padding | |
2423 | out the DATA with either 0x00, or 0xff. For floating point registers | |
2424 | 0xff is used, for everyone else 0x00 is used. */ | |
2425 | ||
2426 | static void | |
2427 | riscv_regcache_cooked_write (int regnum, const gdb_byte *data, int len, | |
2428 | struct regcache *regcache, int flen) | |
2429 | { | |
2430 | gdb_byte tmp [sizeof (ULONGEST)]; | |
2431 | ||
2432 | /* FP values in FP registers must be NaN-boxed. */ | |
2433 | if (riscv_is_fp_regno_p (regnum) && len < flen) | |
2434 | memset (tmp, -1, sizeof (tmp)); | |
2435 | else | |
2436 | memset (tmp, 0, sizeof (tmp)); | |
2437 | memcpy (tmp, data, len); | |
2438 | regcache->cooked_write (regnum, tmp); | |
2439 | } | |
2440 | ||
dbbb1059 AB |
2441 | /* Implement the push dummy call gdbarch callback. */ |
2442 | ||
2443 | static CORE_ADDR | |
2444 | riscv_push_dummy_call (struct gdbarch *gdbarch, | |
2445 | struct value *function, | |
2446 | struct regcache *regcache, | |
2447 | CORE_ADDR bp_addr, | |
2448 | int nargs, | |
2449 | struct value **args, | |
2450 | CORE_ADDR sp, | |
cf84fa6b | 2451 | function_call_return_method return_method, |
dbbb1059 AB |
2452 | CORE_ADDR struct_addr) |
2453 | { | |
2454 | int i; | |
2455 | CORE_ADDR sp_args, sp_refs; | |
2456 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
dbbb1059 AB |
2457 | |
2458 | struct riscv_arg_info *arg_info = | |
2459 | (struct riscv_arg_info *) alloca (nargs * sizeof (struct riscv_arg_info)); | |
dbbb1059 AB |
2460 | |
2461 | struct riscv_call_info call_info (gdbarch); | |
2462 | ||
2463 | CORE_ADDR osp = sp; | |
2464 | ||
8b2d40cb JW |
2465 | struct type *ftype = check_typedef (value_type (function)); |
2466 | ||
2467 | if (TYPE_CODE (ftype) == TYPE_CODE_PTR) | |
2468 | ftype = check_typedef (TYPE_TARGET_TYPE (ftype)); | |
2469 | ||
dbbb1059 | 2470 | /* We'll use register $a0 if we're returning a struct. */ |
cf84fa6b | 2471 | if (return_method == return_method_struct) |
dbbb1059 AB |
2472 | ++call_info.int_regs.next_regnum; |
2473 | ||
b926417a | 2474 | for (i = 0; i < nargs; ++i) |
dbbb1059 AB |
2475 | { |
2476 | struct value *arg_value; | |
2477 | struct type *arg_type; | |
b926417a | 2478 | struct riscv_arg_info *info = &arg_info[i]; |
dbbb1059 AB |
2479 | |
2480 | arg_value = args[i]; | |
2481 | arg_type = check_typedef (value_type (arg_value)); | |
2482 | ||
8b2d40cb JW |
2483 | riscv_arg_location (gdbarch, info, &call_info, arg_type, |
2484 | TYPE_VARARGS (ftype) && i >= TYPE_NFIELDS (ftype)); | |
dbbb1059 AB |
2485 | |
2486 | if (info->type != arg_type) | |
2487 | arg_value = value_cast (info->type, arg_value); | |
2488 | info->contents = value_contents (arg_value); | |
2489 | } | |
2490 | ||
2491 | /* Adjust the stack pointer and align it. */ | |
2492 | sp = sp_refs = align_down (sp - call_info.memory.ref_offset, SP_ALIGNMENT); | |
2493 | sp = sp_args = align_down (sp - call_info.memory.arg_offset, SP_ALIGNMENT); | |
2494 | ||
2495 | if (riscv_debug_infcall > 0) | |
2496 | { | |
2497 | fprintf_unfiltered (gdb_stdlog, "dummy call args:\n"); | |
2498 | fprintf_unfiltered (gdb_stdlog, ": floating point ABI %s in use\n", | |
2499 | (riscv_has_fp_abi (gdbarch) ? "is" : "is not")); | |
2500 | fprintf_unfiltered (gdb_stdlog, ": xlen: %d\n: flen: %d\n", | |
2501 | call_info.xlen, call_info.flen); | |
cf84fa6b | 2502 | if (return_method == return_method_struct) |
dbbb1059 AB |
2503 | fprintf_unfiltered (gdb_stdlog, |
2504 | "[*] struct return pointer in register $A0\n"); | |
2505 | for (i = 0; i < nargs; ++i) | |
2506 | { | |
2507 | struct riscv_arg_info *info = &arg_info [i]; | |
2508 | ||
2509 | fprintf_unfiltered (gdb_stdlog, "[%2d] ", i); | |
cab5bb9d | 2510 | riscv_print_arg_location (gdb_stdlog, gdbarch, info, sp_refs, sp_args); |
dbbb1059 AB |
2511 | fprintf_unfiltered (gdb_stdlog, "\n"); |
2512 | } | |
2513 | if (call_info.memory.arg_offset > 0 | |
2514 | || call_info.memory.ref_offset > 0) | |
2515 | { | |
cab5bb9d AB |
2516 | fprintf_unfiltered (gdb_stdlog, " Original sp: %s\n", |
2517 | core_addr_to_string (osp)); | |
dbbb1059 | 2518 | fprintf_unfiltered (gdb_stdlog, "Stack required (for args): 0x%x\n", |
cab5bb9d | 2519 | call_info.memory.arg_offset); |
dbbb1059 | 2520 | fprintf_unfiltered (gdb_stdlog, "Stack required (for refs): 0x%x\n", |
cab5bb9d | 2521 | call_info.memory.ref_offset); |
fb294655 AB |
2522 | fprintf_unfiltered (gdb_stdlog, " Stack allocated: %s\n", |
2523 | core_addr_to_string_nz (osp - sp)); | |
dbbb1059 AB |
2524 | } |
2525 | } | |
2526 | ||
2527 | /* Now load the argument into registers, or onto the stack. */ | |
2528 | ||
cf84fa6b | 2529 | if (return_method == return_method_struct) |
dbbb1059 AB |
2530 | { |
2531 | gdb_byte buf[sizeof (LONGEST)]; | |
2532 | ||
2533 | store_unsigned_integer (buf, call_info.xlen, byte_order, struct_addr); | |
b66f5587 | 2534 | regcache->cooked_write (RISCV_A0_REGNUM, buf); |
dbbb1059 AB |
2535 | } |
2536 | ||
2537 | for (i = 0; i < nargs; ++i) | |
2538 | { | |
2539 | CORE_ADDR dst; | |
2540 | int second_arg_length = 0; | |
2541 | const gdb_byte *second_arg_data; | |
2542 | struct riscv_arg_info *info = &arg_info [i]; | |
2543 | ||
2544 | gdb_assert (info->length > 0); | |
2545 | ||
2546 | switch (info->argloc[0].loc_type) | |
2547 | { | |
2548 | case riscv_arg_info::location::in_reg: | |
2549 | { | |
dbbb1059 | 2550 | gdb_assert (info->argloc[0].c_length <= info->length); |
dd895392 AB |
2551 | |
2552 | riscv_regcache_cooked_write (info->argloc[0].loc_data.regno, | |
2553 | (info->contents | |
2554 | + info->argloc[0].c_offset), | |
2555 | info->argloc[0].c_length, | |
2556 | regcache, call_info.flen); | |
dbbb1059 | 2557 | second_arg_length = |
9f0272f8 | 2558 | (((info->argloc[0].c_length + info->argloc[0].c_offset) < info->length) |
dbbb1059 AB |
2559 | ? info->argloc[1].c_length : 0); |
2560 | second_arg_data = info->contents + info->argloc[1].c_offset; | |
2561 | } | |
2562 | break; | |
2563 | ||
2564 | case riscv_arg_info::location::on_stack: | |
2565 | dst = sp_args + info->argloc[0].loc_data.offset; | |
2566 | write_memory (dst, info->contents, info->length); | |
2567 | second_arg_length = 0; | |
2568 | break; | |
2569 | ||
2570 | case riscv_arg_info::location::by_ref: | |
2571 | dst = sp_refs + info->argloc[0].loc_data.offset; | |
2572 | write_memory (dst, info->contents, info->length); | |
2573 | ||
2574 | second_arg_length = call_info.xlen; | |
2575 | second_arg_data = (gdb_byte *) &dst; | |
2576 | break; | |
2577 | ||
2578 | default: | |
89a3b63e | 2579 | gdb_assert_not_reached (_("unknown argument location type")); |
dbbb1059 AB |
2580 | } |
2581 | ||
2582 | if (second_arg_length > 0) | |
2583 | { | |
2584 | switch (info->argloc[1].loc_type) | |
2585 | { | |
2586 | case riscv_arg_info::location::in_reg: | |
2587 | { | |
8c49aa89 AB |
2588 | gdb_assert ((riscv_is_fp_regno_p (info->argloc[1].loc_data.regno) |
2589 | && second_arg_length <= call_info.flen) | |
2590 | || second_arg_length <= call_info.xlen); | |
dd895392 AB |
2591 | riscv_regcache_cooked_write (info->argloc[1].loc_data.regno, |
2592 | second_arg_data, | |
2593 | second_arg_length, | |
2594 | regcache, call_info.flen); | |
dbbb1059 AB |
2595 | } |
2596 | break; | |
2597 | ||
2598 | case riscv_arg_info::location::on_stack: | |
2599 | { | |
2600 | CORE_ADDR arg_addr; | |
2601 | ||
2602 | arg_addr = sp_args + info->argloc[1].loc_data.offset; | |
2603 | write_memory (arg_addr, second_arg_data, second_arg_length); | |
2604 | break; | |
2605 | } | |
2606 | ||
2607 | case riscv_arg_info::location::by_ref: | |
2608 | default: | |
2609 | /* The second location should never be a reference, any | |
2610 | argument being passed by reference just places its address | |
2611 | in the first location and is done. */ | |
2612 | error (_("invalid argument location")); | |
2613 | break; | |
2614 | } | |
2615 | } | |
2616 | } | |
2617 | ||
2618 | /* Set the dummy return value to bp_addr. | |
2619 | A dummy breakpoint will be setup to execute the call. */ | |
2620 | ||
2621 | if (riscv_debug_infcall > 0) | |
cab5bb9d AB |
2622 | fprintf_unfiltered (gdb_stdlog, ": writing $ra = %s\n", |
2623 | core_addr_to_string (bp_addr)); | |
dbbb1059 AB |
2624 | regcache_cooked_write_unsigned (regcache, RISCV_RA_REGNUM, bp_addr); |
2625 | ||
2626 | /* Finally, update the stack pointer. */ | |
2627 | ||
2628 | if (riscv_debug_infcall > 0) | |
cab5bb9d AB |
2629 | fprintf_unfiltered (gdb_stdlog, ": writing $sp = %s\n", |
2630 | core_addr_to_string (sp)); | |
dbbb1059 AB |
2631 | regcache_cooked_write_unsigned (regcache, RISCV_SP_REGNUM, sp); |
2632 | ||
2633 | return sp; | |
2634 | } | |
2635 | ||
2636 | /* Implement the return_value gdbarch method. */ | |
2637 | ||
2638 | static enum return_value_convention | |
2639 | riscv_return_value (struct gdbarch *gdbarch, | |
2640 | struct value *function, | |
2641 | struct type *type, | |
2642 | struct regcache *regcache, | |
2643 | gdb_byte *readbuf, | |
2644 | const gdb_byte *writebuf) | |
2645 | { | |
dbbb1059 AB |
2646 | struct riscv_call_info call_info (gdbarch); |
2647 | struct riscv_arg_info info; | |
2648 | struct type *arg_type; | |
2649 | ||
2650 | arg_type = check_typedef (type); | |
8b2d40cb | 2651 | riscv_arg_location (gdbarch, &info, &call_info, arg_type, false); |
dbbb1059 AB |
2652 | |
2653 | if (riscv_debug_infcall > 0) | |
2654 | { | |
2655 | fprintf_unfiltered (gdb_stdlog, "riscv return value:\n"); | |
2656 | fprintf_unfiltered (gdb_stdlog, "[R] "); | |
cab5bb9d | 2657 | riscv_print_arg_location (gdb_stdlog, gdbarch, &info, 0, 0); |
dbbb1059 AB |
2658 | fprintf_unfiltered (gdb_stdlog, "\n"); |
2659 | } | |
2660 | ||
2661 | if (readbuf != nullptr || writebuf != nullptr) | |
2662 | { | |
74e3300d AB |
2663 | unsigned int arg_len; |
2664 | struct value *abi_val; | |
2665 | gdb_byte *old_readbuf = nullptr; | |
2666 | int regnum; | |
2667 | ||
2668 | /* We only do one thing at a time. */ | |
2669 | gdb_assert (readbuf == nullptr || writebuf == nullptr); | |
2670 | ||
2671 | /* In some cases the argument is not returned as the declared type, | |
2672 | and we need to cast to or from the ABI type in order to | |
2673 | correctly access the argument. When writing to the machine we | |
2674 | do the cast here, when reading from the machine the cast occurs | |
2675 | later, after extracting the value. As the ABI type can be | |
2676 | larger than the declared type, then the read or write buffers | |
2677 | passed in might be too small. Here we ensure that we are using | |
2678 | buffers of sufficient size. */ | |
2679 | if (writebuf != nullptr) | |
2680 | { | |
2681 | struct value *arg_val = value_from_contents (arg_type, writebuf); | |
2682 | abi_val = value_cast (info.type, arg_val); | |
2683 | writebuf = value_contents_raw (abi_val); | |
2684 | } | |
2685 | else | |
2686 | { | |
2687 | abi_val = allocate_value (info.type); | |
2688 | old_readbuf = readbuf; | |
2689 | readbuf = value_contents_raw (abi_val); | |
2690 | } | |
2691 | arg_len = TYPE_LENGTH (info.type); | |
dbbb1059 AB |
2692 | |
2693 | switch (info.argloc[0].loc_type) | |
2694 | { | |
2695 | /* Return value in register(s). */ | |
2696 | case riscv_arg_info::location::in_reg: | |
2697 | { | |
2698 | regnum = info.argloc[0].loc_data.regno; | |
74e3300d AB |
2699 | gdb_assert (info.argloc[0].c_length <= arg_len); |
2700 | gdb_assert (info.argloc[0].c_length | |
2701 | <= register_size (gdbarch, regnum)); | |
dbbb1059 AB |
2702 | |
2703 | if (readbuf) | |
9f0272f8 AB |
2704 | { |
2705 | gdb_byte *ptr = readbuf + info.argloc[0].c_offset; | |
2706 | regcache->cooked_read_part (regnum, 0, | |
2707 | info.argloc[0].c_length, | |
2708 | ptr); | |
2709 | } | |
dbbb1059 AB |
2710 | |
2711 | if (writebuf) | |
9f0272f8 AB |
2712 | { |
2713 | const gdb_byte *ptr = writebuf + info.argloc[0].c_offset; | |
dd895392 | 2714 | riscv_regcache_cooked_write (regnum, ptr, |
9f0272f8 | 2715 | info.argloc[0].c_length, |
dd895392 | 2716 | regcache, call_info.flen); |
9f0272f8 | 2717 | } |
dbbb1059 AB |
2718 | |
2719 | /* A return value in register can have a second part in a | |
2720 | second register. */ | |
9f0272f8 | 2721 | if (info.argloc[1].c_length > 0) |
dbbb1059 AB |
2722 | { |
2723 | switch (info.argloc[1].loc_type) | |
2724 | { | |
2725 | case riscv_arg_info::location::in_reg: | |
2726 | regnum = info.argloc[1].loc_data.regno; | |
2727 | ||
74e3300d AB |
2728 | gdb_assert ((info.argloc[0].c_length |
2729 | + info.argloc[1].c_length) <= arg_len); | |
2730 | gdb_assert (info.argloc[1].c_length | |
2731 | <= register_size (gdbarch, regnum)); | |
2732 | ||
dbbb1059 AB |
2733 | if (readbuf) |
2734 | { | |
2735 | readbuf += info.argloc[1].c_offset; | |
74e3300d AB |
2736 | regcache->cooked_read_part (regnum, 0, |
2737 | info.argloc[1].c_length, | |
2738 | readbuf); | |
dbbb1059 AB |
2739 | } |
2740 | ||
2741 | if (writebuf) | |
2742 | { | |
dd895392 AB |
2743 | const gdb_byte *ptr |
2744 | = writebuf + info.argloc[1].c_offset; | |
2745 | riscv_regcache_cooked_write | |
2746 | (regnum, ptr, info.argloc[1].c_length, | |
2747 | regcache, call_info.flen); | |
dbbb1059 AB |
2748 | } |
2749 | break; | |
2750 | ||
2751 | case riscv_arg_info::location::by_ref: | |
2752 | case riscv_arg_info::location::on_stack: | |
2753 | default: | |
2754 | error (_("invalid argument location")); | |
2755 | break; | |
2756 | } | |
2757 | } | |
2758 | } | |
2759 | break; | |
2760 | ||
2761 | /* Return value by reference will have its address in A0. */ | |
2762 | case riscv_arg_info::location::by_ref: | |
2763 | { | |
b2970c23 | 2764 | ULONGEST addr; |
dbbb1059 AB |
2765 | |
2766 | regcache_cooked_read_unsigned (regcache, RISCV_A0_REGNUM, | |
2767 | &addr); | |
2768 | if (readbuf != nullptr) | |
2769 | read_memory (addr, readbuf, info.length); | |
2770 | if (writebuf != nullptr) | |
2771 | write_memory (addr, writebuf, info.length); | |
2772 | } | |
2773 | break; | |
2774 | ||
2775 | case riscv_arg_info::location::on_stack: | |
2776 | default: | |
2777 | error (_("invalid argument location")); | |
2778 | break; | |
2779 | } | |
74e3300d AB |
2780 | |
2781 | /* This completes the cast from abi type back to the declared type | |
2782 | in the case that we are reading from the machine. See the | |
2783 | comment at the head of this block for more details. */ | |
2784 | if (readbuf != nullptr) | |
2785 | { | |
2786 | struct value *arg_val = value_cast (arg_type, abi_val); | |
2787 | memcpy (old_readbuf, value_contents_raw (arg_val), | |
2788 | TYPE_LENGTH (arg_type)); | |
2789 | } | |
dbbb1059 AB |
2790 | } |
2791 | ||
2792 | switch (info.argloc[0].loc_type) | |
2793 | { | |
2794 | case riscv_arg_info::location::in_reg: | |
2795 | return RETURN_VALUE_REGISTER_CONVENTION; | |
2796 | case riscv_arg_info::location::by_ref: | |
2797 | return RETURN_VALUE_ABI_RETURNS_ADDRESS; | |
2798 | case riscv_arg_info::location::on_stack: | |
2799 | default: | |
2800 | error (_("invalid argument location")); | |
2801 | } | |
2802 | } | |
2803 | ||
2804 | /* Implement the frame_align gdbarch method. */ | |
2805 | ||
2806 | static CORE_ADDR | |
2807 | riscv_frame_align (struct gdbarch *gdbarch, CORE_ADDR addr) | |
2808 | { | |
2809 | return align_down (addr, 16); | |
2810 | } | |
2811 | ||
dbbb1059 AB |
2812 | /* Generate, or return the cached frame cache for the RiscV frame |
2813 | unwinder. */ | |
2814 | ||
78a3b0fa | 2815 | static struct riscv_unwind_cache * |
dbbb1059 AB |
2816 | riscv_frame_cache (struct frame_info *this_frame, void **this_cache) |
2817 | { | |
78a3b0fa AB |
2818 | CORE_ADDR pc, start_addr; |
2819 | struct riscv_unwind_cache *cache; | |
dbbb1059 | 2820 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
78a3b0fa | 2821 | int numregs, regno; |
dbbb1059 AB |
2822 | |
2823 | if ((*this_cache) != NULL) | |
78a3b0fa | 2824 | return (struct riscv_unwind_cache *) *this_cache; |
dbbb1059 | 2825 | |
78a3b0fa AB |
2826 | cache = FRAME_OBSTACK_ZALLOC (struct riscv_unwind_cache); |
2827 | cache->regs = trad_frame_alloc_saved_regs (this_frame); | |
2828 | (*this_cache) = cache; | |
dbbb1059 | 2829 | |
78a3b0fa AB |
2830 | /* Scan the prologue, filling in the cache. */ |
2831 | start_addr = get_frame_func (this_frame); | |
dbbb1059 | 2832 | pc = get_frame_pc (this_frame); |
78a3b0fa AB |
2833 | riscv_scan_prologue (gdbarch, start_addr, pc, cache); |
2834 | ||
2835 | /* We can now calculate the frame base address. */ | |
2836 | cache->frame_base | |
6c9d681b AB |
2837 | = (get_frame_register_signed (this_frame, cache->frame_base_reg) |
2838 | + cache->frame_base_offset); | |
78a3b0fa AB |
2839 | if (riscv_debug_unwinder) |
2840 | fprintf_unfiltered (gdb_stdlog, "Frame base is %s ($%s + 0x%x)\n", | |
2841 | core_addr_to_string (cache->frame_base), | |
2842 | gdbarch_register_name (gdbarch, | |
2843 | cache->frame_base_reg), | |
2844 | cache->frame_base_offset); | |
2845 | ||
2846 | /* The prologue scanner sets the address of registers stored to the stack | |
2847 | as the offset of that register from the frame base. The prologue | |
2848 | scanner doesn't know the actual frame base value, and so is unable to | |
2849 | compute the exact address. We do now know the frame base value, so | |
2850 | update the address of registers stored to the stack. */ | |
2851 | numregs = gdbarch_num_regs (gdbarch) + gdbarch_num_pseudo_regs (gdbarch); | |
2852 | for (regno = 0; regno < numregs; ++regno) | |
2853 | { | |
2854 | if (trad_frame_addr_p (cache->regs, regno)) | |
2855 | cache->regs[regno].addr += cache->frame_base; | |
2856 | } | |
2857 | ||
2858 | /* The previous $pc can be found wherever the $ra value can be found. | |
2859 | The previous $ra value is gone, this would have been stored be the | |
2860 | previous frame if required. */ | |
2861 | cache->regs[gdbarch_pc_regnum (gdbarch)] = cache->regs[RISCV_RA_REGNUM]; | |
2862 | trad_frame_set_unknown (cache->regs, RISCV_RA_REGNUM); | |
2863 | ||
2864 | /* Build the frame id. */ | |
2865 | cache->this_id = frame_id_build (cache->frame_base, start_addr); | |
dbbb1059 | 2866 | |
78a3b0fa AB |
2867 | /* The previous $sp value is the frame base value. */ |
2868 | trad_frame_set_value (cache->regs, gdbarch_sp_regnum (gdbarch), | |
2869 | cache->frame_base); | |
dbbb1059 | 2870 | |
78a3b0fa | 2871 | return cache; |
dbbb1059 AB |
2872 | } |
2873 | ||
2874 | /* Implement the this_id callback for RiscV frame unwinder. */ | |
2875 | ||
2876 | static void | |
2877 | riscv_frame_this_id (struct frame_info *this_frame, | |
2878 | void **prologue_cache, | |
2879 | struct frame_id *this_id) | |
2880 | { | |
78a3b0fa | 2881 | struct riscv_unwind_cache *cache; |
dbbb1059 | 2882 | |
a70b8144 | 2883 | try |
17cf2897 AB |
2884 | { |
2885 | cache = riscv_frame_cache (this_frame, prologue_cache); | |
2886 | *this_id = cache->this_id; | |
2887 | } | |
230d2906 | 2888 | catch (const gdb_exception_error &ex) |
17cf2897 AB |
2889 | { |
2890 | /* Ignore errors, this leaves the frame id as the predefined outer | |
2891 | frame id which terminates the backtrace at this point. */ | |
2892 | } | |
dbbb1059 AB |
2893 | } |
2894 | ||
2895 | /* Implement the prev_register callback for RiscV frame unwinder. */ | |
2896 | ||
2897 | static struct value * | |
2898 | riscv_frame_prev_register (struct frame_info *this_frame, | |
2899 | void **prologue_cache, | |
2900 | int regnum) | |
2901 | { | |
78a3b0fa | 2902 | struct riscv_unwind_cache *cache; |
dbbb1059 | 2903 | |
78a3b0fa AB |
2904 | cache = riscv_frame_cache (this_frame, prologue_cache); |
2905 | return trad_frame_get_prev_register (this_frame, cache->regs, regnum); | |
dbbb1059 AB |
2906 | } |
2907 | ||
2908 | /* Structure defining the RiscV normal frame unwind functions. Since we | |
2909 | are the fallback unwinder (DWARF unwinder is used first), we use the | |
2910 | default frame sniffer, which always accepts the frame. */ | |
2911 | ||
2912 | static const struct frame_unwind riscv_frame_unwind = | |
2913 | { | |
2914 | /*.type =*/ NORMAL_FRAME, | |
2915 | /*.stop_reason =*/ default_frame_unwind_stop_reason, | |
2916 | /*.this_id =*/ riscv_frame_this_id, | |
2917 | /*.prev_register =*/ riscv_frame_prev_register, | |
2918 | /*.unwind_data =*/ NULL, | |
2919 | /*.sniffer =*/ default_frame_sniffer, | |
2920 | /*.dealloc_cache =*/ NULL, | |
2921 | /*.prev_arch =*/ NULL, | |
2922 | }; | |
2923 | ||
90af0679 AB |
2924 | /* Extract a set of required target features out of INFO, specifically the |
2925 | bfd being executed is examined to see what target features it requires. | |
2926 | IF there is no current bfd, or the bfd doesn't indicate any useful | |
2927 | features then a RISCV_GDBARCH_FEATURES is returned in its default state. */ | |
dbbb1059 | 2928 | |
90af0679 AB |
2929 | static struct riscv_gdbarch_features |
2930 | riscv_features_from_gdbarch_info (const struct gdbarch_info info) | |
dbbb1059 | 2931 | { |
b5ffee31 | 2932 | struct riscv_gdbarch_features features; |
dbbb1059 | 2933 | |
b5ffee31 AB |
2934 | /* Now try to improve on the defaults by looking at the binary we are |
2935 | going to execute. We assume the user knows what they are doing and | |
2936 | that the target will match the binary. Remember, this code path is | |
2937 | only used at all if the target hasn't given us a description, so this | |
2938 | is really a last ditched effort to do something sane before giving | |
2939 | up. */ | |
dbbb1059 AB |
2940 | if (info.abfd != NULL |
2941 | && bfd_get_flavour (info.abfd) == bfd_target_elf_flavour) | |
2942 | { | |
2943 | unsigned char eclass = elf_elfheader (info.abfd)->e_ident[EI_CLASS]; | |
2944 | int e_flags = elf_elfheader (info.abfd)->e_flags; | |
2945 | ||
2946 | if (eclass == ELFCLASS32) | |
b5ffee31 | 2947 | features.xlen = 4; |
dbbb1059 | 2948 | else if (eclass == ELFCLASS64) |
b5ffee31 | 2949 | features.xlen = 8; |
dbbb1059 | 2950 | else |
b5ffee31 | 2951 | internal_error (__FILE__, __LINE__, |
dbbb1059 AB |
2952 | _("unknown ELF header class %d"), eclass); |
2953 | ||
dbbb1059 | 2954 | if (e_flags & EF_RISCV_FLOAT_ABI_DOUBLE) |
113b7b81 | 2955 | features.flen = 8; |
dbbb1059 | 2956 | else if (e_flags & EF_RISCV_FLOAT_ABI_SINGLE) |
113b7b81 | 2957 | features.flen = 4; |
dbbb1059 | 2958 | } |
dbbb1059 | 2959 | |
90af0679 AB |
2960 | return features; |
2961 | } | |
2962 | ||
2963 | /* Find a suitable default target description. Use the contents of INFO, | |
2964 | specifically the bfd object being executed, to guide the selection of a | |
2965 | suitable default target description. */ | |
2966 | ||
2967 | static const struct target_desc * | |
2968 | riscv_find_default_target_description (const struct gdbarch_info info) | |
2969 | { | |
2970 | /* Extract desired feature set from INFO. */ | |
2971 | struct riscv_gdbarch_features features | |
2972 | = riscv_features_from_gdbarch_info (info); | |
2973 | ||
2974 | /* If the XLEN field is still 0 then we got nothing useful from INFO. In | |
2975 | this case we fall back to a minimal useful target, 8-byte x-registers, | |
2976 | with no floating point. */ | |
2977 | if (features.xlen == 0) | |
2978 | features.xlen = 8; | |
2979 | ||
b5ffee31 | 2980 | /* Now build a target description based on the feature set. */ |
d1c9b20f | 2981 | return riscv_lookup_target_description (features); |
b5ffee31 AB |
2982 | } |
2983 | ||
2984 | /* All of the registers in REG_SET are checked for in FEATURE, TDESC_DATA | |
2985 | is updated with the register numbers for each register as listed in | |
2986 | REG_SET. If any register marked as required in REG_SET is not found in | |
2987 | FEATURE then this function returns false, otherwise, it returns true. */ | |
2988 | ||
2989 | static bool | |
2990 | riscv_check_tdesc_feature (struct tdesc_arch_data *tdesc_data, | |
2991 | const struct tdesc_feature *feature, | |
2992 | const struct riscv_register_feature *reg_set) | |
2993 | { | |
2994 | for (const auto ® : reg_set->registers) | |
2995 | { | |
2996 | bool found = false; | |
2997 | ||
2998 | for (const char *name : reg.names) | |
2999 | { | |
3000 | found = | |
3001 | tdesc_numbered_register (feature, tdesc_data, reg.regnum, name); | |
3002 | ||
3003 | if (found) | |
3004 | break; | |
3005 | } | |
3006 | ||
3007 | if (!found && reg.required_p) | |
3008 | return false; | |
3009 | } | |
3010 | ||
3011 | return true; | |
3012 | } | |
3013 | ||
3014 | /* Add all the expected register sets into GDBARCH. */ | |
3015 | ||
3016 | static void | |
3017 | riscv_add_reggroups (struct gdbarch *gdbarch) | |
3018 | { | |
3019 | /* Add predefined register groups. */ | |
3020 | reggroup_add (gdbarch, all_reggroup); | |
3021 | reggroup_add (gdbarch, save_reggroup); | |
3022 | reggroup_add (gdbarch, restore_reggroup); | |
3023 | reggroup_add (gdbarch, system_reggroup); | |
3024 | reggroup_add (gdbarch, vector_reggroup); | |
3025 | reggroup_add (gdbarch, general_reggroup); | |
3026 | reggroup_add (gdbarch, float_reggroup); | |
3027 | ||
3028 | /* Add RISC-V specific register groups. */ | |
3029 | reggroup_add (gdbarch, csr_reggroup); | |
3030 | } | |
3031 | ||
3032 | /* Create register aliases for all the alternative names that exist for | |
3033 | registers in REG_SET. */ | |
3034 | ||
3035 | static void | |
3036 | riscv_setup_register_aliases (struct gdbarch *gdbarch, | |
3037 | const struct riscv_register_feature *reg_set) | |
3038 | { | |
3039 | for (auto ® : reg_set->registers) | |
3040 | { | |
3041 | /* The first item in the names list is the preferred name for the | |
3042 | register, this is what RISCV_REGISTER_NAME returns, and so we | |
3043 | don't need to create an alias with that name here. */ | |
3044 | for (int i = 1; i < reg.names.size (); ++i) | |
3045 | user_reg_add (gdbarch, reg.names[i], value_of_riscv_user_reg, | |
3046 | ®.regnum); | |
3047 | } | |
3048 | } | |
3049 | ||
fb44d95a AB |
3050 | /* Implement the "dwarf2_reg_to_regnum" gdbarch method. */ |
3051 | ||
3052 | static int | |
3053 | riscv_dwarf_reg_to_regnum (struct gdbarch *gdbarch, int reg) | |
3054 | { | |
3055 | if (reg < RISCV_DWARF_REGNUM_X31) | |
3056 | return RISCV_ZERO_REGNUM + (reg - RISCV_DWARF_REGNUM_X0); | |
3057 | ||
3058 | else if (reg < RISCV_DWARF_REGNUM_F31) | |
3059 | return RISCV_FIRST_FP_REGNUM + (reg - RISCV_DWARF_REGNUM_F0); | |
3060 | ||
3061 | return -1; | |
3062 | } | |
3063 | ||
ff371ec9 JW |
3064 | /* Implement the gcc_target_options method. We have to select the arch and abi |
3065 | from the feature info. We have enough feature info to select the abi, but | |
3066 | not enough info for the arch given all of the possible architecture | |
3067 | extensions. So choose reasonable defaults for now. */ | |
3068 | ||
3069 | static std::string | |
3070 | riscv_gcc_target_options (struct gdbarch *gdbarch) | |
3071 | { | |
3072 | int isa_xlen = riscv_isa_xlen (gdbarch); | |
3073 | int isa_flen = riscv_isa_flen (gdbarch); | |
3074 | int abi_xlen = riscv_abi_xlen (gdbarch); | |
3075 | int abi_flen = riscv_abi_flen (gdbarch); | |
3076 | std::string target_options; | |
3077 | ||
3078 | target_options = "-march=rv"; | |
3079 | if (isa_xlen == 8) | |
3080 | target_options += "64"; | |
3081 | else | |
3082 | target_options += "32"; | |
3083 | if (isa_flen == 8) | |
3084 | target_options += "gc"; | |
3085 | else if (isa_flen == 4) | |
3086 | target_options += "imafc"; | |
3087 | else | |
3088 | target_options += "imac"; | |
3089 | ||
3090 | target_options += " -mabi="; | |
3091 | if (abi_xlen == 8) | |
3092 | target_options += "lp64"; | |
3093 | else | |
3094 | target_options += "ilp32"; | |
3095 | if (abi_flen == 8) | |
3096 | target_options += "d"; | |
3097 | else if (abi_flen == 4) | |
3098 | target_options += "f"; | |
3099 | ||
3100 | /* The gdb loader doesn't handle link-time relaxation relocations. */ | |
3101 | target_options += " -mno-relax"; | |
3102 | ||
3103 | return target_options; | |
3104 | } | |
3105 | ||
3106 | /* Implement the gnu_triplet_regexp method. A single compiler supports both | |
3107 | 32-bit and 64-bit code, and may be named riscv32 or riscv64 or (not | |
3108 | recommended) riscv. */ | |
3109 | ||
3110 | static const char * | |
3111 | riscv_gnu_triplet_regexp (struct gdbarch *gdbarch) | |
3112 | { | |
3113 | return "riscv(32|64)?"; | |
3114 | } | |
3115 | ||
b5ffee31 AB |
3116 | /* Initialize the current architecture based on INFO. If possible, |
3117 | re-use an architecture from ARCHES, which is a list of | |
3118 | architectures already created during this debugging session. | |
3119 | ||
3120 | Called e.g. at program startup, when reading a core file, and when | |
3121 | reading a binary file. */ | |
3122 | ||
3123 | static struct gdbarch * | |
3124 | riscv_gdbarch_init (struct gdbarch_info info, | |
3125 | struct gdbarch_list *arches) | |
3126 | { | |
3127 | struct gdbarch *gdbarch; | |
3128 | struct gdbarch_tdep *tdep; | |
3129 | struct riscv_gdbarch_features features; | |
3130 | const struct target_desc *tdesc = info.target_desc; | |
3131 | ||
3132 | /* Ensure we always have a target description. */ | |
3133 | if (!tdesc_has_registers (tdesc)) | |
3134 | tdesc = riscv_find_default_target_description (info); | |
3135 | gdb_assert (tdesc); | |
3136 | ||
3137 | if (riscv_debug_gdbarch) | |
3138 | fprintf_unfiltered (gdb_stdlog, "Have got a target description\n"); | |
3139 | ||
3140 | const struct tdesc_feature *feature_cpu | |
3141 | = tdesc_find_feature (tdesc, riscv_xreg_feature.name); | |
3142 | const struct tdesc_feature *feature_fpu | |
3143 | = tdesc_find_feature (tdesc, riscv_freg_feature.name); | |
3144 | const struct tdesc_feature *feature_virtual | |
3145 | = tdesc_find_feature (tdesc, riscv_virtual_feature.name); | |
3146 | const struct tdesc_feature *feature_csr | |
3147 | = tdesc_find_feature (tdesc, riscv_csr_feature.name); | |
3148 | ||
3149 | if (feature_cpu == NULL) | |
3150 | return NULL; | |
3151 | ||
3152 | struct tdesc_arch_data *tdesc_data = tdesc_data_alloc (); | |
3153 | ||
3154 | bool valid_p = riscv_check_tdesc_feature (tdesc_data, | |
3155 | feature_cpu, | |
3156 | &riscv_xreg_feature); | |
3157 | if (valid_p) | |
3158 | { | |
3159 | /* Check that all of the core cpu registers have the same bitsize. */ | |
3160 | int xlen_bitsize = tdesc_register_bitsize (feature_cpu, "pc"); | |
3161 | ||
3162 | for (auto &tdesc_reg : feature_cpu->registers) | |
3163 | valid_p &= (tdesc_reg->bitsize == xlen_bitsize); | |
3164 | ||
3165 | if (riscv_debug_gdbarch) | |
3166 | fprintf_filtered | |
3167 | (gdb_stdlog, | |
3168 | "From target-description, xlen = %d\n", xlen_bitsize); | |
3169 | ||
3170 | features.xlen = (xlen_bitsize / 8); | |
3171 | } | |
3172 | ||
3173 | if (feature_fpu != NULL) | |
3174 | { | |
3175 | valid_p &= riscv_check_tdesc_feature (tdesc_data, feature_fpu, | |
3176 | &riscv_freg_feature); | |
3177 | ||
0a5954bd SC |
3178 | /* Search for the first floating point register (by any alias), to |
3179 | determine the bitsize. */ | |
3180 | int bitsize = -1; | |
3181 | const auto &fp0 = riscv_freg_feature.registers[0]; | |
3182 | ||
3183 | for (const char *name : fp0.names) | |
3184 | { | |
3185 | if (tdesc_unnumbered_register (feature_fpu, name)) | |
3186 | { | |
3187 | bitsize = tdesc_register_bitsize (feature_fpu, name); | |
3188 | break; | |
3189 | } | |
3190 | } | |
3191 | ||
3192 | gdb_assert (bitsize != -1); | |
b5ffee31 | 3193 | features.flen = (bitsize / 8); |
b5ffee31 AB |
3194 | |
3195 | if (riscv_debug_gdbarch) | |
3196 | fprintf_filtered | |
3197 | (gdb_stdlog, | |
3198 | "From target-description, flen = %d\n", bitsize); | |
3199 | } | |
3200 | else | |
3201 | { | |
3202 | features.flen = 0; | |
b5ffee31 AB |
3203 | |
3204 | if (riscv_debug_gdbarch) | |
3205 | fprintf_filtered | |
3206 | (gdb_stdlog, | |
3207 | "No FPU in target-description, assume soft-float ABI\n"); | |
3208 | } | |
3209 | ||
3210 | if (feature_virtual) | |
3211 | riscv_check_tdesc_feature (tdesc_data, feature_virtual, | |
3212 | &riscv_virtual_feature); | |
3213 | ||
3214 | if (feature_csr) | |
3215 | riscv_check_tdesc_feature (tdesc_data, feature_csr, | |
3216 | &riscv_csr_feature); | |
3217 | ||
3218 | if (!valid_p) | |
3219 | { | |
3220 | if (riscv_debug_gdbarch) | |
3221 | fprintf_unfiltered (gdb_stdlog, "Target description is not valid\n"); | |
3222 | tdesc_data_cleanup (tdesc_data); | |
3223 | return NULL; | |
3224 | } | |
3225 | ||
90af0679 AB |
3226 | /* Have a look at what the supplied (if any) bfd object requires of the |
3227 | target, then check that this matches with what the target is | |
3228 | providing. */ | |
113b7b81 | 3229 | struct riscv_gdbarch_features abi_features |
90af0679 | 3230 | = riscv_features_from_gdbarch_info (info); |
113b7b81 AB |
3231 | /* In theory a binary compiled for RV32 could run on an RV64 target, |
3232 | however, this has not been tested in GDB yet, so for now we require | |
3233 | that the requested xlen match the targets xlen. */ | |
3234 | if (abi_features.xlen != 0 && abi_features.xlen != features.xlen) | |
90af0679 | 3235 | error (_("bfd requires xlen %d, but target has xlen %d"), |
113b7b81 AB |
3236 | abi_features.xlen, features.xlen); |
3237 | /* We do support running binaries compiled for 32-bit float on targets | |
3238 | with 64-bit float, so we only complain if the binary requires more | |
3239 | than the target has available. */ | |
3240 | if (abi_features.flen > features.flen) | |
90af0679 | 3241 | error (_("bfd requires flen %d, but target has flen %d"), |
113b7b81 | 3242 | abi_features.flen, features.flen); |
90af0679 | 3243 | |
113b7b81 AB |
3244 | /* If the ABI_FEATURES xlen is 0 then this indicates we got no useful abi |
3245 | features from the INFO object. In this case we assume that the xlen | |
3246 | abi matches the hardware. */ | |
3247 | if (abi_features.xlen == 0) | |
3248 | abi_features.xlen = features.xlen; | |
90af0679 | 3249 | |
dbbb1059 AB |
3250 | /* Find a candidate among the list of pre-declared architectures. */ |
3251 | for (arches = gdbarch_list_lookup_by_info (arches, &info); | |
3252 | arches != NULL; | |
3253 | arches = gdbarch_list_lookup_by_info (arches->next, &info)) | |
b5ffee31 AB |
3254 | { |
3255 | /* Check that the feature set of the ARCHES matches the feature set | |
3256 | we are looking for. If it doesn't then we can't reuse this | |
3257 | gdbarch. */ | |
3258 | struct gdbarch_tdep *other_tdep = gdbarch_tdep (arches->gdbarch); | |
3259 | ||
113b7b81 AB |
3260 | if (other_tdep->isa_features != features |
3261 | || other_tdep->abi_features != abi_features) | |
b5ffee31 AB |
3262 | continue; |
3263 | ||
3264 | break; | |
3265 | } | |
3266 | ||
3267 | if (arches != NULL) | |
3268 | { | |
3269 | tdesc_data_cleanup (tdesc_data); | |
dbbb1059 | 3270 | return arches->gdbarch; |
b5ffee31 | 3271 | } |
dbbb1059 AB |
3272 | |
3273 | /* None found, so create a new architecture from the information provided. */ | |
b5ffee31 | 3274 | tdep = new (struct gdbarch_tdep); |
dbbb1059 | 3275 | gdbarch = gdbarch_alloc (&info, tdep); |
113b7b81 AB |
3276 | tdep->isa_features = features; |
3277 | tdep->abi_features = abi_features; | |
dbbb1059 AB |
3278 | |
3279 | /* Target data types. */ | |
3280 | set_gdbarch_short_bit (gdbarch, 16); | |
3281 | set_gdbarch_int_bit (gdbarch, 32); | |
3282 | set_gdbarch_long_bit (gdbarch, riscv_isa_xlen (gdbarch) * 8); | |
3283 | set_gdbarch_long_long_bit (gdbarch, 64); | |
3284 | set_gdbarch_float_bit (gdbarch, 32); | |
3285 | set_gdbarch_double_bit (gdbarch, 64); | |
3286 | set_gdbarch_long_double_bit (gdbarch, 128); | |
3287 | set_gdbarch_long_double_format (gdbarch, floatformats_ia64_quad); | |
3288 | set_gdbarch_ptr_bit (gdbarch, riscv_isa_xlen (gdbarch) * 8); | |
3289 | set_gdbarch_char_signed (gdbarch, 0); | |
a9158a86 | 3290 | set_gdbarch_type_align (gdbarch, riscv_type_align); |
dbbb1059 AB |
3291 | |
3292 | /* Information about the target architecture. */ | |
3293 | set_gdbarch_return_value (gdbarch, riscv_return_value); | |
3294 | set_gdbarch_breakpoint_kind_from_pc (gdbarch, riscv_breakpoint_kind_from_pc); | |
3295 | set_gdbarch_sw_breakpoint_from_kind (gdbarch, riscv_sw_breakpoint_from_kind); | |
5a77b1b4 | 3296 | set_gdbarch_have_nonsteppable_watchpoint (gdbarch, 1); |
dbbb1059 | 3297 | |
dbbb1059 | 3298 | /* Functions to analyze frames. */ |
dbbb1059 AB |
3299 | set_gdbarch_skip_prologue (gdbarch, riscv_skip_prologue); |
3300 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); | |
3301 | set_gdbarch_frame_align (gdbarch, riscv_frame_align); | |
3302 | ||
dbbb1059 AB |
3303 | /* Functions handling dummy frames. */ |
3304 | set_gdbarch_call_dummy_location (gdbarch, ON_STACK); | |
3305 | set_gdbarch_push_dummy_code (gdbarch, riscv_push_dummy_code); | |
3306 | set_gdbarch_push_dummy_call (gdbarch, riscv_push_dummy_call); | |
dbbb1059 AB |
3307 | |
3308 | /* Frame unwinders. Use DWARF debug info if available, otherwise use our own | |
3309 | unwinder. */ | |
3310 | dwarf2_append_unwinders (gdbarch); | |
3311 | frame_unwind_append_unwinder (gdbarch, &riscv_frame_unwind); | |
3312 | ||
b5ffee31 AB |
3313 | /* Register architecture. */ |
3314 | riscv_add_reggroups (gdbarch); | |
3315 | ||
fb44d95a AB |
3316 | /* Internal <-> external register number maps. */ |
3317 | set_gdbarch_dwarf2_reg_to_regnum (gdbarch, riscv_dwarf_reg_to_regnum); | |
3318 | ||
b5ffee31 AB |
3319 | /* We reserve all possible register numbers for the known registers. |
3320 | This means the target description mechanism will add any target | |
3321 | specific registers after this number. This helps make debugging GDB | |
3322 | just a little easier. */ | |
3323 | set_gdbarch_num_regs (gdbarch, RISCV_LAST_REGNUM + 1); | |
3324 | ||
3325 | /* We don't have to provide the count of 0 here (its the default) but | |
3326 | include this line to make it explicit that, right now, we don't have | |
3327 | any pseudo registers on RISC-V. */ | |
3328 | set_gdbarch_num_pseudo_regs (gdbarch, 0); | |
3329 | ||
3330 | /* Some specific register numbers GDB likes to know about. */ | |
3331 | set_gdbarch_sp_regnum (gdbarch, RISCV_SP_REGNUM); | |
3332 | set_gdbarch_pc_regnum (gdbarch, RISCV_PC_REGNUM); | |
3333 | ||
3334 | set_gdbarch_print_registers_info (gdbarch, riscv_print_registers_info); | |
3335 | ||
3336 | /* Finalise the target description registers. */ | |
3337 | tdesc_use_registers (gdbarch, tdesc, tdesc_data); | |
3338 | ||
3339 | /* Override the register type callback setup by the target description | |
3340 | mechanism. This allows us to provide special type for floating point | |
3341 | registers. */ | |
3342 | set_gdbarch_register_type (gdbarch, riscv_register_type); | |
3343 | ||
3344 | /* Override the register name callback setup by the target description | |
3345 | mechanism. This allows us to force our preferred names for the | |
3346 | registers, no matter what the target description called them. */ | |
3347 | set_gdbarch_register_name (gdbarch, riscv_register_name); | |
3348 | ||
3349 | /* Override the register group callback setup by the target description | |
3350 | mechanism. This allows us to force registers into the groups we | |
3351 | want, ignoring what the target tells us. */ | |
3352 | set_gdbarch_register_reggroup_p (gdbarch, riscv_register_reggroup_p); | |
3353 | ||
3354 | /* Create register aliases for alternative register names. */ | |
3355 | riscv_setup_register_aliases (gdbarch, &riscv_xreg_feature); | |
3356 | if (riscv_has_fp_regs (gdbarch)) | |
3357 | riscv_setup_register_aliases (gdbarch, &riscv_freg_feature); | |
3358 | riscv_setup_register_aliases (gdbarch, &riscv_csr_feature); | |
dbbb1059 | 3359 | |
ff371ec9 JW |
3360 | /* Compile command hooks. */ |
3361 | set_gdbarch_gcc_target_options (gdbarch, riscv_gcc_target_options); | |
3362 | set_gdbarch_gnu_triplet_regexp (gdbarch, riscv_gnu_triplet_regexp); | |
3363 | ||
117a0e99 JW |
3364 | /* Hook in OS ABI-specific overrides, if they have been registered. */ |
3365 | gdbarch_init_osabi (info, gdbarch); | |
3366 | ||
db3ad2f0 TT |
3367 | register_riscv_ravenscar_ops (gdbarch); |
3368 | ||
dbbb1059 AB |
3369 | return gdbarch; |
3370 | } | |
3371 | ||
5c720ed8 JW |
3372 | /* This decodes the current instruction and determines the address of the |
3373 | next instruction. */ | |
3374 | ||
3375 | static CORE_ADDR | |
3376 | riscv_next_pc (struct regcache *regcache, CORE_ADDR pc) | |
3377 | { | |
3378 | struct gdbarch *gdbarch = regcache->arch (); | |
3379 | struct riscv_insn insn; | |
3380 | CORE_ADDR next_pc; | |
3381 | ||
3382 | insn.decode (gdbarch, pc); | |
3383 | next_pc = pc + insn.length (); | |
3384 | ||
3385 | if (insn.opcode () == riscv_insn::JAL) | |
3386 | next_pc = pc + insn.imm_signed (); | |
3387 | else if (insn.opcode () == riscv_insn::JALR) | |
3388 | { | |
3389 | LONGEST source; | |
3390 | regcache->cooked_read (insn.rs1 (), &source); | |
3391 | next_pc = (source + insn.imm_signed ()) & ~(CORE_ADDR) 0x1; | |
3392 | } | |
3393 | else if (insn.opcode () == riscv_insn::BEQ) | |
3394 | { | |
3395 | LONGEST src1, src2; | |
3396 | regcache->cooked_read (insn.rs1 (), &src1); | |
3397 | regcache->cooked_read (insn.rs2 (), &src2); | |
3398 | if (src1 == src2) | |
3399 | next_pc = pc + insn.imm_signed (); | |
3400 | } | |
3401 | else if (insn.opcode () == riscv_insn::BNE) | |
3402 | { | |
3403 | LONGEST src1, src2; | |
3404 | regcache->cooked_read (insn.rs1 (), &src1); | |
3405 | regcache->cooked_read (insn.rs2 (), &src2); | |
3406 | if (src1 != src2) | |
3407 | next_pc = pc + insn.imm_signed (); | |
3408 | } | |
3409 | else if (insn.opcode () == riscv_insn::BLT) | |
3410 | { | |
3411 | LONGEST src1, src2; | |
3412 | regcache->cooked_read (insn.rs1 (), &src1); | |
3413 | regcache->cooked_read (insn.rs2 (), &src2); | |
3414 | if (src1 < src2) | |
3415 | next_pc = pc + insn.imm_signed (); | |
3416 | } | |
3417 | else if (insn.opcode () == riscv_insn::BGE) | |
3418 | { | |
3419 | LONGEST src1, src2; | |
3420 | regcache->cooked_read (insn.rs1 (), &src1); | |
3421 | regcache->cooked_read (insn.rs2 (), &src2); | |
3422 | if (src1 >= src2) | |
3423 | next_pc = pc + insn.imm_signed (); | |
3424 | } | |
3425 | else if (insn.opcode () == riscv_insn::BLTU) | |
3426 | { | |
3427 | ULONGEST src1, src2; | |
3428 | regcache->cooked_read (insn.rs1 (), &src1); | |
3429 | regcache->cooked_read (insn.rs2 (), &src2); | |
3430 | if (src1 < src2) | |
3431 | next_pc = pc + insn.imm_signed (); | |
3432 | } | |
3433 | else if (insn.opcode () == riscv_insn::BGEU) | |
3434 | { | |
3435 | ULONGEST src1, src2; | |
3436 | regcache->cooked_read (insn.rs1 (), &src1); | |
3437 | regcache->cooked_read (insn.rs2 (), &src2); | |
3438 | if (src1 >= src2) | |
3439 | next_pc = pc + insn.imm_signed (); | |
3440 | } | |
3441 | ||
3442 | return next_pc; | |
3443 | } | |
3444 | ||
3445 | /* We can't put a breakpoint in the middle of a lr/sc atomic sequence, so look | |
3446 | for the end of the sequence and put the breakpoint there. */ | |
3447 | ||
3448 | static bool | |
3449 | riscv_next_pc_atomic_sequence (struct regcache *regcache, CORE_ADDR pc, | |
3450 | CORE_ADDR *next_pc) | |
3451 | { | |
3452 | struct gdbarch *gdbarch = regcache->arch (); | |
3453 | struct riscv_insn insn; | |
3454 | CORE_ADDR cur_step_pc = pc; | |
3455 | CORE_ADDR last_addr = 0; | |
3456 | ||
3457 | /* First instruction has to be a load reserved. */ | |
3458 | insn.decode (gdbarch, cur_step_pc); | |
3459 | if (insn.opcode () != riscv_insn::LR) | |
3460 | return false; | |
3461 | cur_step_pc = cur_step_pc + insn.length (); | |
3462 | ||
3463 | /* Next instruction should be branch to exit. */ | |
3464 | insn.decode (gdbarch, cur_step_pc); | |
3465 | if (insn.opcode () != riscv_insn::BNE) | |
3466 | return false; | |
3467 | last_addr = cur_step_pc + insn.imm_signed (); | |
3468 | cur_step_pc = cur_step_pc + insn.length (); | |
3469 | ||
3470 | /* Next instruction should be store conditional. */ | |
3471 | insn.decode (gdbarch, cur_step_pc); | |
3472 | if (insn.opcode () != riscv_insn::SC) | |
3473 | return false; | |
3474 | cur_step_pc = cur_step_pc + insn.length (); | |
3475 | ||
3476 | /* Next instruction should be branch to start. */ | |
3477 | insn.decode (gdbarch, cur_step_pc); | |
3478 | if (insn.opcode () != riscv_insn::BNE) | |
3479 | return false; | |
3480 | if (pc != (cur_step_pc + insn.imm_signed ())) | |
3481 | return false; | |
3482 | cur_step_pc = cur_step_pc + insn.length (); | |
3483 | ||
3484 | /* We should now be at the end of the sequence. */ | |
3485 | if (cur_step_pc != last_addr) | |
3486 | return false; | |
3487 | ||
3488 | *next_pc = cur_step_pc; | |
3489 | return true; | |
3490 | } | |
3491 | ||
3492 | /* This is called just before we want to resume the inferior, if we want to | |
3493 | single-step it but there is no hardware or kernel single-step support. We | |
3494 | find the target of the coming instruction and breakpoint it. */ | |
3495 | ||
3496 | std::vector<CORE_ADDR> | |
3497 | riscv_software_single_step (struct regcache *regcache) | |
3498 | { | |
3499 | CORE_ADDR pc, next_pc; | |
3500 | ||
3501 | pc = regcache_read_pc (regcache); | |
3502 | ||
3503 | if (riscv_next_pc_atomic_sequence (regcache, pc, &next_pc)) | |
3504 | return {next_pc}; | |
3505 | ||
3506 | next_pc = riscv_next_pc (regcache, pc); | |
3507 | ||
3508 | return {next_pc}; | |
3509 | } | |
3510 | ||
b5ffee31 AB |
3511 | /* Create RISC-V specific reggroups. */ |
3512 | ||
3513 | static void | |
3514 | riscv_init_reggroups () | |
3515 | { | |
3516 | csr_reggroup = reggroup_new ("csr", USER_REGGROUP); | |
3517 | } | |
3518 | ||
6c265988 | 3519 | void _initialize_riscv_tdep (); |
dbbb1059 | 3520 | void |
6c265988 | 3521 | _initialize_riscv_tdep () |
dbbb1059 | 3522 | { |
b5ffee31 AB |
3523 | riscv_create_csr_aliases (); |
3524 | riscv_init_reggroups (); | |
3525 | ||
dbbb1059 AB |
3526 | gdbarch_register (bfd_arch_riscv, riscv_gdbarch_init, NULL); |
3527 | ||
dbbb1059 AB |
3528 | /* Add root prefix command for all "set debug riscv" and "show debug |
3529 | riscv" commands. */ | |
3530 | add_prefix_cmd ("riscv", no_class, set_debug_riscv_command, | |
3531 | _("RISC-V specific debug commands."), | |
3532 | &setdebugriscvcmdlist, "set debug riscv ", 0, | |
3533 | &setdebuglist); | |
3534 | ||
3535 | add_prefix_cmd ("riscv", no_class, show_debug_riscv_command, | |
3536 | _("RISC-V specific debug commands."), | |
3537 | &showdebugriscvcmdlist, "show debug riscv ", 0, | |
3538 | &showdebuglist); | |
3539 | ||
f37bc8b1 JB |
3540 | add_setshow_zuinteger_cmd ("breakpoints", class_maintenance, |
3541 | &riscv_debug_breakpoints, _("\ | |
3542 | Set riscv breakpoint debugging."), _("\ | |
3543 | Show riscv breakpoint debugging."), _("\ | |
3544 | When non-zero, print debugging information for the riscv specific parts\n\ | |
3545 | of the breakpoint mechanism."), | |
3546 | NULL, | |
3547 | show_riscv_debug_variable, | |
3548 | &setdebugriscvcmdlist, &showdebugriscvcmdlist); | |
3549 | ||
dbbb1059 AB |
3550 | add_setshow_zuinteger_cmd ("infcall", class_maintenance, |
3551 | &riscv_debug_infcall, _("\ | |
3552 | Set riscv inferior call debugging."), _("\ | |
3553 | Show riscv inferior call debugging."), _("\ | |
3554 | When non-zero, print debugging information for the riscv specific parts\n\ | |
3555 | of the inferior call mechanism."), | |
3556 | NULL, | |
3557 | show_riscv_debug_variable, | |
3558 | &setdebugriscvcmdlist, &showdebugriscvcmdlist); | |
78a3b0fa AB |
3559 | |
3560 | add_setshow_zuinteger_cmd ("unwinder", class_maintenance, | |
3561 | &riscv_debug_unwinder, _("\ | |
3562 | Set riscv stack unwinding debugging."), _("\ | |
3563 | Show riscv stack unwinding debugging."), _("\ | |
3564 | When non-zero, print debugging information for the riscv specific parts\n\ | |
3565 | of the stack unwinding mechanism."), | |
3566 | NULL, | |
3567 | show_riscv_debug_variable, | |
3568 | &setdebugriscvcmdlist, &showdebugriscvcmdlist); | |
b5ffee31 AB |
3569 | |
3570 | add_setshow_zuinteger_cmd ("gdbarch", class_maintenance, | |
3571 | &riscv_debug_gdbarch, _("\ | |
3572 | Set riscv gdbarch initialisation debugging."), _("\ | |
3573 | Show riscv gdbarch initialisation debugging."), _("\ | |
3574 | When non-zero, print debugging information for the riscv gdbarch\n\ | |
3575 | initialisation process."), | |
3576 | NULL, | |
3577 | show_riscv_debug_variable, | |
3578 | &setdebugriscvcmdlist, &showdebugriscvcmdlist); | |
dbbb1059 AB |
3579 | |
3580 | /* Add root prefix command for all "set riscv" and "show riscv" commands. */ | |
3581 | add_prefix_cmd ("riscv", no_class, set_riscv_command, | |
3582 | _("RISC-V specific commands."), | |
3583 | &setriscvcmdlist, "set riscv ", 0, &setlist); | |
3584 | ||
3585 | add_prefix_cmd ("riscv", no_class, show_riscv_command, | |
3586 | _("RISC-V specific commands."), | |
3587 | &showriscvcmdlist, "show riscv ", 0, &showlist); | |
3588 | ||
3589 | ||
3590 | use_compressed_breakpoints = AUTO_BOOLEAN_AUTO; | |
3591 | add_setshow_auto_boolean_cmd ("use-compressed-breakpoints", no_class, | |
3592 | &use_compressed_breakpoints, | |
3593 | _("\ | |
3594 | Set debugger's use of compressed breakpoints."), _(" \ | |
3595 | Show debugger's use of compressed breakpoints."), _("\ | |
f37bc8b1 JB |
3596 | Debugging compressed code requires compressed breakpoints to be used. If\n\ |
3597 | left to 'auto' then gdb will use them if the existing instruction is a\n\ | |
3598 | compressed instruction. If that doesn't give the correct behavior, then\n\ | |
3599 | this option can be used."), | |
dbbb1059 AB |
3600 | NULL, |
3601 | show_use_compressed_breakpoints, | |
3602 | &setriscvcmdlist, | |
3603 | &showriscvcmdlist); | |
3604 | } |