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c906108c SS |
1 | /* Parameters for target machine ARC, for GDB, the GNU debugger. |
2 | Copyright (C) 1995 Free Software Foundation, Inc. | |
3 | Contributed by Cygnus Support. | |
4 | ||
c5aa993b | 5 | This file is part of GDB. |
c906108c | 6 | |
c5aa993b JM |
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 2 of the License, or | |
10 | (at your option) any later version. | |
c906108c | 11 | |
c5aa993b JM |
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. | |
c906108c | 16 | |
c5aa993b JM |
17 | You should have received a copy of the GNU General Public License |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
21 | |
22 | /* Used by arc-tdep.c to set the default cpu type. */ | |
23 | #define DEFAULT_ARC_CPU_TYPE "base" | |
24 | ||
25 | /* Byte order is selectable. */ | |
26 | #define TARGET_BYTE_ORDER_SELECTABLE | |
27 | ||
28 | /* We have IEEE floating point, if we have any float at all. */ | |
7355ddba | 29 | #define IEEE_FLOAT (1) |
c906108c SS |
30 | |
31 | /* Offset from address of function to start of its code. | |
32 | Zero on most machines. */ | |
33 | #define FUNCTION_START_OFFSET 0 | |
34 | ||
35 | /* Advance PC across any function entry prologue instructions | |
36 | to reach some "real" code. SKIP_PROLOGUE_FRAMELESS_P advances | |
37 | the PC past some of the prologue, but stops as soon as it | |
38 | knows that the function has a frame. Its result is equal | |
39 | to its input PC if the function is frameless, unequal otherwise. */ | |
40 | ||
b83266a0 SS |
41 | #define SKIP_PROLOGUE(pc) (arc_skip_prologue (pc, 0)) |
42 | #define SKIP_PROLOGUE_FRAMELESS_P(pc) (arc_skip_prologue (pc, 1)) | |
a14ed312 | 43 | extern CORE_ADDR arc_skip_prologue (CORE_ADDR, int); |
c906108c SS |
44 | |
45 | /* Sequence of bytes for breakpoint instruction. | |
46 | ??? The current value is "sr -1,[-1]" and is for the simulator only. | |
47 | The simulator watches for this and does the right thing. | |
48 | The hardware version will have to associate with each breakpoint | |
49 | the sequence "flag 1; nop; nop; nop". IE: The breakpoint insn will not | |
50 | be a fixed set of bits but instead will be a branch to a semi-random | |
51 | address. Presumably this will be cleaned up for "second silicon". */ | |
52 | #define BIG_BREAKPOINT { 0x12, 0x1f, 0xff, 0xff } | |
53 | #define LITTLE_BREAKPOINT { 0xff, 0xff, 0x1f, 0x12 } | |
54 | ||
55 | /* Given the exposed pipeline, there isn't any one correct value. | |
56 | However, this value must be 4. GDB can't handle any other value (other than | |
57 | zero). See for example infrun.c: | |
58 | "prev_pc != stop_pc - DECR_PC_AFTER_BREAK" */ | |
59 | /* FIXME */ | |
60 | #define DECR_PC_AFTER_BREAK 8 | |
61 | ||
62 | /* We don't have a reliable single step facility. | |
63 | ??? We do have a cycle single step facility, but that won't work. */ | |
64 | #define SOFTWARE_SINGLE_STEP_P 1 | |
a14ed312 | 65 | extern void arc_software_single_step (unsigned int, int); |
c906108c SS |
66 | #define SOFTWARE_SINGLE_STEP(sig,bp_p) arc_software_single_step (sig, bp_p) |
67 | ||
68 | /* FIXME: Need to set STEP_SKIPS_DELAY. */ | |
69 | ||
70 | /* Given a pc value as defined by the hardware, return the real address. | |
71 | Remember that on the ARC blink contains that status register which | |
72 | includes PC + flags (so we have to mask out the flags). */ | |
73 | #define ARC_PC_TO_REAL_ADDRESS(pc) (((pc) & 0xffffff) << 2) | |
74 | ||
75 | /* Immediately after a function call, return the saved pc. | |
76 | Can't always go through the frames for this because on some machines | |
77 | the new frame is not set up until the new function | |
78 | executes some instructions. */ | |
79 | ||
80 | #define SAVED_PC_AFTER_CALL(frame) \ | |
81 | (ARC_PC_TO_REAL_ADDRESS (read_register (BLINK_REGNUM))) | |
82 | ||
83 | /* Stack grows upward */ | |
84 | ||
85 | #define INNER_THAN(lhs,rhs) ((lhs) < (rhs)) | |
86 | ||
87 | /* Say how long (ordinary) registers are. This is a piece of bogosity | |
88 | used in push_word and a few other places; REGISTER_RAW_SIZE is the | |
89 | real way to know how big a register is. */ | |
90 | #define REGISTER_SIZE 4 | |
91 | ||
92 | /* Number of machine registers */ | |
93 | #define NUM_REGS 92 | |
94 | ||
95 | /* Initializer for an array of names of registers. | |
96 | There should be NUM_REGS strings in this initializer. */ | |
97 | ||
98 | #define REGISTER_NAMES \ | |
99 | { \ | |
100 | /* 0 */ "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \ | |
101 | /* 8 */ "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", \ | |
102 | /* 16 */ "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", \ | |
103 | /* 24 */ "r24", "r25", "r26", "fp", "sp", "ilink1", "ilink2", "blink", \ | |
104 | /* 32 */ "r32", "r33", "r34", "r35", "r36", "r37", "r38", "r39", \ | |
105 | /* 40 */ "r40", "r41", "r42", "r43", "r44", "r45", "r46", "r47", \ | |
106 | /* 48 */ "r48", "r49", "r50", "r51", "r52", "r53", "r54", "r55", \ | |
107 | /* 56 */ "r56", "mlo", "mmid", "mhi", "lp_count", \ | |
108 | /* 61 */ "status", "sema", "lp_start", "lp_end", "identity", "debug", \ | |
109 | /* 67 */ "aux10", "aux11", "aux12", "aux13", "aux14", \ | |
110 | /* 72 */ "aux15", "aux16", "aux17", "aux18", "aux19", \ | |
111 | /* 77 */ "aux1a", "aux1b", "aux1c", "aux1d", "aux1e", \ | |
112 | /* 82 */ "aux1f", "aux20", "aux21", "aux22", \ | |
113 | /* 86 */ "aux30", "aux31", "aux32", "aux33", "aux40", \ | |
114 | /* 91 */ "pc" \ | |
115 | } | |
116 | ||
117 | /* Register numbers of various important registers (used to index | |
118 | into arrays of register names and register values). */ | |
119 | ||
c5aa993b JM |
120 | #define R0_REGNUM 0 /* First local register */ |
121 | #define R59_REGNUM 59 /* Last local register */ | |
122 | #define FP_REGNUM 27 /* Contains address of executing stack frame */ | |
123 | #define SP_REGNUM 28 /* stack pointer */ | |
124 | #define BLINK_REGNUM 31 /* link register */ | |
125 | #define STA_REGNUM 61 /* processor status word */ | |
126 | #define PC_REGNUM 91 /* instruction pointer */ | |
127 | #define AUX_BEG_REGNUM 61 /* aux reg begins */ | |
128 | #define AUX_END_REGNUM 90 /* aux reg ends, pc not real aux reg */ | |
c906108c SS |
129 | |
130 | /* Fake registers used to mark immediate data. */ | |
131 | #define SHIMM_FLAG_REGNUM 61 | |
132 | #define LIMM_REGNUM 62 | |
133 | #define SHIMM_REGNUM 63 | |
134 | ||
135 | #define AUX_REG_MAP \ | |
136 | { \ | |
137 | { 0, 1, 2, 3, 4, 5, \ | |
138 | 16, -1, -1, -1, -1, \ | |
139 | -1, -1, -1, -1, -1, \ | |
140 | -1, -1, -1, -1, 30, \ | |
141 | -1, 32, 33, -1, \ | |
142 | 48, 49, 50, 51, 64, \ | |
143 | 0 \ | |
144 | }, \ | |
145 | { 0, 1, 2, 3, 4, 5, \ | |
146 | 16, -1, -1, -1, -1, \ | |
147 | -1, -1, -1, -1, -1, \ | |
148 | -1, -1, -1, -1, 30, \ | |
149 | 31, 32, 33, -1, \ | |
150 | -1, -1, -1, -1, -1, \ | |
151 | 0 \ | |
152 | }, \ | |
153 | { 0, 1, 2, 3, 4, 5, \ | |
154 | 16, 17, 18, 19, 20, \ | |
155 | 21, 22, 23, 24, 25, \ | |
156 | 26, 27, 28, 29, 30, \ | |
157 | 31, 32, 33, 34, \ | |
158 | -1, -1, -1, -1, -1, \ | |
159 | 0 \ | |
160 | } \ | |
161 | } | |
c5aa993b JM |
162 | |
163 | #define PFP_REGNUM R0_REGNUM /* Previous frame pointer */ | |
c906108c SS |
164 | |
165 | /* Total amount of space needed to store our copies of the machine's | |
166 | register state, the array `registers'. */ | |
167 | #define REGISTER_BYTES (NUM_REGS * 4) | |
168 | ||
169 | /* Index within `registers' of the first byte of the space for register N. */ | |
170 | #define REGISTER_BYTE(N) (4*(N)) | |
171 | ||
172 | /* Number of bytes of storage in the actual machine representation | |
173 | for register N. */ | |
174 | #define REGISTER_RAW_SIZE(N) 4 | |
175 | ||
176 | /* Number of bytes of storage in the program's representation for register N. */ | |
177 | #define REGISTER_VIRTUAL_SIZE(N) 4 | |
178 | ||
179 | /* Largest value REGISTER_RAW_SIZE can have. */ | |
180 | #define MAX_REGISTER_RAW_SIZE 4 | |
181 | ||
182 | /* Largest value REGISTER_VIRTUAL_SIZE can have. */ | |
183 | #define MAX_REGISTER_VIRTUAL_SIZE 4 | |
184 | ||
185 | /* Return the GDB type object for the "standard" data type | |
186 | of data in register N. */ | |
187 | #define REGISTER_VIRTUAL_TYPE(N) (builtin_type_int) | |
c906108c | 188 | \f |
c5aa993b | 189 | |
c906108c SS |
190 | /* Macros for understanding function return values... */ |
191 | ||
192 | /* Does the specified function use the "struct returning" convention | |
193 | or the "value returning" convention? The "value returning" convention | |
194 | almost invariably returns the entire value in registers. The | |
195 | "struct returning" convention often returns the entire value in | |
196 | memory, and passes a pointer (out of or into the function) saying | |
197 | where the value (is or should go). | |
198 | ||
199 | Since this sometimes depends on whether it was compiled with GCC, | |
200 | this is also an argument. This is used in call_function to build a | |
201 | stack, and in value_being_returned to print return values. | |
202 | ||
203 | On arc, a structure is always retunred with pointer in r0. */ | |
204 | ||
205 | #define USE_STRUCT_CONVENTION(gcc_p, type) 1 | |
206 | ||
207 | /* Extract from an array REGBUF containing the (raw) register state | |
208 | a function return value of type TYPE, and copy that, in virtual format, | |
209 | into VALBUF. This is only called if USE_STRUCT_CONVENTION for this | |
210 | type is 0. | |
c5aa993b | 211 | */ |
c906108c SS |
212 | #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \ |
213 | memcpy(VALBUF, REGBUF+REGISTER_BYTE(R0_REGNUM), TYPE_LENGTH (TYPE)) | |
214 | ||
215 | /* If USE_STRUCT_CONVENTION produces a 1, | |
216 | extract from an array REGBUF containing the (raw) register state | |
217 | the address in which a function should return its structure value, | |
218 | as a CORE_ADDR (or an expression that can be used as one). */ | |
219 | #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \ | |
220 | (error("Don't know where large structure is returned on arc"), 0) | |
221 | ||
222 | /* Write into appropriate registers a function return value | |
223 | of type TYPE, given in virtual format, for "value returning" functions. | |
224 | For 'return' command: not (yet) implemented for arc. */ | |
225 | #define STORE_RETURN_VALUE(TYPE,VALBUF) \ | |
226 | error ("Returning values from functions is not implemented in arc gdb") | |
227 | ||
228 | /* Store the address of the place in which to copy the structure the | |
229 | subroutine will return. This is called from call_function. */ | |
230 | #define STORE_STRUCT_RETURN(ADDR, SP) \ | |
231 | error ("Returning values from functions is not implemented in arc gdb") | |
c906108c | 232 | \f |
c5aa993b | 233 | |
c906108c SS |
234 | /* Describe the pointer in each stack frame to the previous stack frame |
235 | (its caller). */ | |
236 | ||
237 | /* We cache information about saved registers in the frame structure, | |
238 | to save us from having to re-scan function prologues every time | |
239 | a register in a non-current frame is accessed. */ | |
240 | ||
241 | #define EXTRA_FRAME_INFO \ | |
242 | struct frame_saved_regs *fsr; \ | |
243 | CORE_ADDR arg_pointer; | |
244 | ||
245 | /* Zero the frame_saved_regs pointer when the frame is initialized, | |
246 | so that FRAME_FIND_SAVED_REGS () will know to allocate and | |
247 | initialize a frame_saved_regs struct the first time it is called. | |
248 | Set the arg_pointer to -1, which is not valid; 0 and other values | |
249 | indicate real, cached values. */ | |
250 | ||
251 | #define INIT_EXTRA_FRAME_INFO(fromleaf, fi) \ | |
252 | ((fi)->fsr = 0, (fi)->arg_pointer = -1) | |
253 | ||
254 | /* FRAME_CHAIN takes a frame's nominal address | |
255 | and produces the frame's chain-pointer. | |
256 | However, if FRAME_CHAIN_VALID returns zero, | |
257 | it means the given frame is the outermost one and has no caller. */ | |
258 | /* On the arc, we get the chain pointer by reading the PFP saved | |
259 | on the stack. */ | |
260 | /* The PFP and RPC is in fp and fp+4. */ | |
261 | ||
262 | #define FRAME_CHAIN(thisframe) \ | |
263 | (read_memory_integer (FRAME_FP (thisframe), 4)) | |
264 | ||
265 | /* FRAME_CHAIN_VALID returns zero if the given frame is the outermost one | |
266 | and has no caller. */ | |
267 | #define FRAME_CHAIN_VALID(chain, thisframe) nonnull_frame_chain_valid (chain, thisframe) | |
268 | ||
392a587b JM |
269 | /* An expression that tells us whether the function invocation represented |
270 | by FI does not have a frame on the stack associated with it. */ | |
271 | ||
272 | #define FRAMELESS_FUNCTION_INVOCATION(FI) \ | |
273 | (((FI)->signal_handler_caller) ? 0 : frameless_look_for_prologue (FI)) | |
c906108c SS |
274 | |
275 | /* Where is the PC for a specific frame. | |
276 | A leaf function may never save blink, so we have to check for that here. */ | |
277 | ||
278 | #define FRAME_SAVED_PC(frame) (arc_frame_saved_pc (frame)) | |
c5aa993b | 279 | struct frame_info; /* in case frame.h not included yet */ |
a14ed312 | 280 | CORE_ADDR arc_frame_saved_pc (struct frame_info *); |
c906108c SS |
281 | |
282 | /* If the argument is on the stack, it will be here. | |
283 | We cache this value in the frame info if we've already looked it up. */ | |
284 | /* ??? Is the arg_pointer check necessary? */ | |
285 | ||
286 | #define FRAME_ARGS_ADDRESS(fi) \ | |
287 | (((fi)->arg_pointer != -1) ? (fi)->arg_pointer : (fi)->frame) | |
288 | ||
289 | /* This is the same except it should return 0 when | |
290 | it does not really know where the args are, rather than guessing. | |
291 | This value is not cached since it is only used infrequently. */ | |
292 | ||
293 | #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame) | |
294 | ||
295 | /* Set NUMARGS to the number of args passed to a frame. | |
296 | Can return -1, meaning no way to tell. */ | |
297 | ||
392a587b | 298 | #define FRAME_NUM_ARGS(fi) (-1) |
c906108c SS |
299 | |
300 | /* Return number of bytes at start of arglist that are not really args. */ | |
301 | ||
302 | #define FRAME_ARGS_SKIP 0 | |
303 | ||
304 | /* Produce the positions of the saved registers in a stack frame. */ | |
305 | ||
306 | #define FRAME_FIND_SAVED_REGS(frame_info_addr, sr) \ | |
307 | frame_find_saved_regs (frame_info_addr, &sr) | |
c5aa993b | 308 | extern void frame_find_saved_regs (); /* See arc-tdep.c */ |
c906108c | 309 | \f |
c5aa993b | 310 | |
c906108c | 311 | /* Things needed for making calls to functions in the inferior process */ |
d4f3574e | 312 | void arc_push_dummy_frame (void); |
c906108c | 313 | #define PUSH_DUMMY_FRAME \ |
d4f3574e | 314 | arc_push_dummy_frame () |
c906108c SS |
315 | |
316 | /* Discard from the stack the innermost frame, restoring all registers. */ | |
d4f3574e | 317 | void arc_pop_frame (void); |
c906108c | 318 | #define POP_FRAME \ |
d4f3574e | 319 | arc_pop_frame () |
c906108c SS |
320 | |
321 | /* This sequence of words is the instructions bl xxxx, flag 1 */ | |
c5aa993b | 322 | #define CALL_DUMMY { 0x28000000, 0x1fbe8001 } |
c906108c SS |
323 | #define CALL_DUMMY_LENGTH 8 |
324 | ||
325 | /* Start execution at beginning of dummy */ | |
c5aa993b | 326 | #define CALL_DUMMY_START_OFFSET 0 |
c906108c SS |
327 | |
328 | /* Insert the specified number of args and function address | |
c5aa993b | 329 | into a call sequence of the above form stored at 'dummyname'. */ |
c906108c SS |
330 | #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \ |
331 | { \ | |
332 | int from, to, delta, loc; \ | |
333 | loc = (int)(read_register (SP_REGNUM) - CALL_DUMMY_LENGTH); \ | |
334 | from = loc + 4; \ | |
335 | to = (int)(fun); \ | |
336 | delta = (to - from) >> 2; \ | |
337 | *((char *)(dummyname) + 1) = (delta & 0x1); \ | |
338 | *((char *)(dummyname) + 2) = ((delta >> 1) & 0xff); \ | |
339 | *((char *)(dummyname) + 3) = ((delta >> 9) & 0xff); \ | |
340 | *((char *)(dummyname) + 4) = ((delta >> 17) & 0x7); \ | |
341 | } |