Commit | Line | Data |
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e2810631 | 1 | /* Target-dependent code for the NEC V850 for GDB, the GNU debugger. |
ac954805 | 2 | Copyright 1996, Free Software Foundation, Inc. |
e2810631 SG |
3 | |
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
19 | ||
e2810631 SG |
20 | #include "defs.h" |
21 | #include "frame.h" | |
22 | #include "inferior.h" | |
23 | #include "obstack.h" | |
24 | #include "target.h" | |
25 | #include "value.h" | |
26 | #include "bfd.h" | |
27 | #include "gdb_string.h" | |
e2810631 | 28 | #include "gdbcore.h" |
23da411a SG |
29 | #include "symfile.h" |
30 | ||
23da411a SG |
31 | /* Info gleaned from scanning a function's prologue. */ |
32 | ||
a638512f SG |
33 | struct pifsr /* Info about one saved reg */ |
34 | { | |
35 | int framereg; /* Frame reg (SP or FP) */ | |
36 | int offset; /* Offset from framereg */ | |
a490f8c1 | 37 | int cur_frameoffset; /* Current frameoffset */ |
a638512f SG |
38 | int reg; /* Saved register number */ |
39 | }; | |
40 | ||
23da411a | 41 | struct prologue_info |
e5a2ac8b | 42 | { |
e5a2ac8b | 43 | int framereg; |
23da411a SG |
44 | int frameoffset; |
45 | int start_function; | |
a638512f | 46 | struct pifsr *pifsrs; |
23da411a | 47 | }; |
e5a2ac8b | 48 | |
dc1b349d MS |
49 | static CORE_ADDR v850_scan_prologue PARAMS ((CORE_ADDR pc, |
50 | struct prologue_info *fs)); | |
98760eab AC |
51 | |
52 | ||
53 | /* Should call_function allocate stack space for a struct return? */ | |
54 | int | |
55 | v850_use_struct_convention (gcc_p, type) | |
56 | int gcc_p; | |
57 | struct type *type; | |
58 | { | |
59 | return (TYPE_NFIELDS (type) > 1 || TYPE_LENGTH (type) > 4); | |
60 | } | |
61 | ||
23da411a | 62 | \f |
dc1b349d MS |
63 | /* Function: scan_prologue |
64 | Scan the prologue of the function that contains PC, and record what | |
65 | we find in PI. PI->fsr must be zeroed by the called. Returns the | |
66 | pc after the prologue. Note that the addresses saved in pi->fsr | |
67 | are actually just frame relative (negative offsets from the frame | |
68 | pointer). This is because we don't know the actual value of the | |
69 | frame pointer yet. In some circumstances, the frame pointer can't | |
70 | be determined till after we have scanned the prologue. */ | |
23da411a SG |
71 | |
72 | static CORE_ADDR | |
dc1b349d | 73 | v850_scan_prologue (pc, pi) |
23da411a SG |
74 | CORE_ADDR pc; |
75 | struct prologue_info *pi; | |
76 | { | |
77 | CORE_ADDR func_addr, prologue_end, current_pc; | |
a490f8c1 | 78 | struct pifsr *pifsr, *pifsr_tmp; |
23da411a | 79 | int fp_used; |
b71f8719 | 80 | int ep_used; |
a490f8c1 MM |
81 | int reg; |
82 | CORE_ADDR save_pc, save_end; | |
83 | int regsave_func_p; | |
84 | int current_sp_size; | |
0b019fa1 | 85 | int r12_tmp; |
e5a2ac8b SG |
86 | |
87 | /* First, figure out the bounds of the prologue so that we can limit the | |
88 | search to something reasonable. */ | |
89 | ||
23da411a | 90 | if (find_pc_partial_function (pc, NULL, &func_addr, NULL)) |
e5a2ac8b | 91 | { |
23da411a SG |
92 | struct symtab_and_line sal; |
93 | ||
e5a2ac8b SG |
94 | sal = find_pc_line (func_addr, 0); |
95 | ||
23da411a SG |
96 | if (func_addr == entry_point_address ()) |
97 | pi->start_function = 1; | |
98 | else | |
99 | pi->start_function = 0; | |
100 | ||
a638512f | 101 | #if 0 |
ac954805 | 102 | if (sal.line == 0) |
23da411a | 103 | prologue_end = pc; |
ac954805 SG |
104 | else |
105 | prologue_end = sal.end; | |
a638512f SG |
106 | #else |
107 | prologue_end = pc; | |
108 | #endif | |
e5a2ac8b SG |
109 | } |
110 | else | |
23da411a SG |
111 | { /* We're in the boondocks */ |
112 | func_addr = pc - 100; | |
113 | prologue_end = pc; | |
114 | } | |
e5a2ac8b | 115 | |
23da411a | 116 | prologue_end = min (prologue_end, pc); |
e5a2ac8b SG |
117 | |
118 | /* Now, search the prologue looking for instructions that setup fp, save | |
23da411a SG |
119 | rp, adjust sp and such. We also record the frame offset of any saved |
120 | registers. */ | |
e5a2ac8b | 121 | |
23da411a SG |
122 | pi->frameoffset = 0; |
123 | pi->framereg = SP_REGNUM; | |
124 | fp_used = 0; | |
b71f8719 | 125 | ep_used = 0; |
a638512f | 126 | pifsr = pi->pifsrs; |
a490f8c1 MM |
127 | regsave_func_p = 0; |
128 | save_pc = 0; | |
129 | save_end = 0; | |
0b019fa1 | 130 | r12_tmp = 0; |
a490f8c1 MM |
131 | |
132 | #ifdef DEBUG | |
133 | printf_filtered ("Current_pc = 0x%.8lx, prologue_end = 0x%.8lx\n", | |
134 | (long)func_addr, (long)prologue_end); | |
135 | #endif | |
e5a2ac8b SG |
136 | |
137 | for (current_pc = func_addr; current_pc < prologue_end; current_pc += 2) | |
138 | { | |
139 | int insn; | |
140 | ||
a490f8c1 MM |
141 | #ifdef DEBUG |
142 | printf_filtered ("0x%.8lx ", (long)current_pc); | |
143 | (*tm_print_insn) (current_pc, &tm_print_insn_info); | |
144 | #endif | |
145 | ||
6420594b | 146 | insn = read_memory_unsigned_integer (current_pc, 2); |
e5a2ac8b | 147 | |
a490f8c1 MM |
148 | if ((insn & 0xffc0) == ((10 << 11) | 0x0780) && !regsave_func_p) |
149 | { /* jarl <func>,10 */ | |
150 | long low_disp = read_memory_unsigned_integer (current_pc + 2, 2) & ~ (long) 1; | |
151 | long disp = (((((insn & 0x3f) << 16) + low_disp) | |
152 | & ~ (long) 1) ^ 0x00200000) - 0x00200000; | |
153 | ||
154 | save_pc = current_pc; | |
155 | save_end = prologue_end; | |
156 | regsave_func_p = 1; | |
157 | current_pc += disp - 2; | |
158 | prologue_end = (current_pc | |
159 | + (2 * 3) /* moves to/from ep */ | |
160 | + 4 /* addi <const>,sp,sp */ | |
161 | + 2 /* jmp [r10] */ | |
162 | + (2 * 12) /* sst.w to save r2, r20-r29, r31 */ | |
163 | + 20); /* slop area */ | |
164 | ||
165 | #ifdef DEBUG | |
166 | printf_filtered ("\tfound jarl <func>,r10, disp = %ld, low_disp = %ld, new pc = 0x%.8lx\n", | |
167 | disp, low_disp, (long)current_pc + 2); | |
168 | #endif | |
169 | continue; | |
170 | } | |
171 | else if ((insn & 0xffe0) == 0x0060 && regsave_func_p) | |
172 | { /* jmp after processing register save function */ | |
173 | current_pc = save_pc + 2; | |
174 | prologue_end = save_end; | |
175 | regsave_func_p = 0; | |
176 | #ifdef DEBUG | |
177 | printf_filtered ("\tfound jmp after regsave func"); | |
178 | #endif | |
179 | } | |
180 | else if ((insn & 0x07c0) == 0x0780 /* jarl or jr */ | |
181 | || (insn & 0xffe0) == 0x0060 /* jmp */ | |
182 | || (insn & 0x0780) == 0x0580) /* branch */ | |
183 | { | |
184 | #ifdef DEBUG | |
185 | printf_filtered ("\n"); | |
186 | #endif | |
187 | break; /* Ran into end of prologue */ | |
188 | } | |
189 | ||
190 | else if ((insn & 0xffe0) == ((SP_REGNUM << 11) | 0x0240)) /* add <imm>,sp */ | |
191 | pi->frameoffset += ((insn & 0x1f) ^ 0x10) - 0x10; | |
192 | else if (insn == ((SP_REGNUM << 11) | 0x0600 | SP_REGNUM)) /* addi <imm>,sp,sp */ | |
193 | pi->frameoffset += read_memory_integer (current_pc + 2, 2); | |
ea45efcf | 194 | else if (insn == ((FP_RAW_REGNUM << 11) | 0x0000 | SP_REGNUM)) /* mov sp,fp */ |
e5a2ac8b | 195 | { |
23da411a | 196 | fp_used = 1; |
ea45efcf | 197 | pi->framereg = FP_RAW_REGNUM; |
23da411a | 198 | } |
a490f8c1 | 199 | |
0b019fa1 MM |
200 | else if (insn == ((R12_REGNUM << 11) | 0x0640 | R0_REGNUM)) /* movhi hi(const),r0,r12 */ |
201 | r12_tmp = read_memory_integer (current_pc + 2, 2) << 16; | |
202 | else if (insn == ((R12_REGNUM << 11) | 0x0620 | R12_REGNUM)) /* movea lo(const),r12,r12 */ | |
203 | r12_tmp += read_memory_integer (current_pc + 2, 2); | |
204 | else if (insn == ((SP_REGNUM << 11) | 0x01c0 | R12_REGNUM) && r12_tmp) /* add r12,sp */ | |
205 | pi->frameoffset = r12_tmp; | |
a490f8c1 | 206 | else if (insn == ((EP_REGNUM << 11) | 0x0000 | SP_REGNUM)) /* mov sp,ep */ |
b71f8719 | 207 | ep_used = 1; |
a490f8c1 | 208 | else if (insn == ((EP_REGNUM << 11) | 0x0000 | R1_REGNUM)) /* mov r1,ep */ |
b71f8719 | 209 | ep_used = 0; |
0b019fa1 | 210 | else if (((insn & 0x07ff) == (0x0760 | SP_REGNUM) /* st.w <reg>,<offset>[sp] */ |
b71f8719 | 211 | || (fp_used |
ea45efcf | 212 | && (insn & 0x07ff) == (0x0760 | FP_RAW_REGNUM))) /* st.w <reg>,<offset>[fp] */ |
a490f8c1 MM |
213 | && pifsr |
214 | && (((reg = (insn >> 11) & 0x1f) >= SAVE1_START_REGNUM && reg <= SAVE1_END_REGNUM) | |
215 | || (reg >= SAVE2_START_REGNUM && reg <= SAVE2_END_REGNUM) | |
216 | || (reg >= SAVE3_START_REGNUM && reg <= SAVE3_END_REGNUM))) | |
b71f8719 | 217 | { |
a490f8c1 | 218 | pifsr->reg = reg; |
b71f8719 | 219 | pifsr->offset = read_memory_integer (current_pc + 2, 2) & ~1; |
a490f8c1 MM |
220 | pifsr->cur_frameoffset = pi->frameoffset; |
221 | #ifdef DEBUG | |
222 | printf_filtered ("\tSaved register r%d, offset %d", reg, pifsr->offset); | |
223 | #endif | |
b71f8719 MM |
224 | pifsr++; |
225 | } | |
226 | ||
a490f8c1 | 227 | else if (ep_used /* sst.w <reg>,<offset>[ep] */ |
b71f8719 | 228 | && ((insn & 0x0781) == 0x0501) |
a490f8c1 MM |
229 | && pifsr |
230 | && (((reg = (insn >> 11) & 0x1f) >= SAVE1_START_REGNUM && reg <= SAVE1_END_REGNUM) | |
231 | || (reg >= SAVE2_START_REGNUM && reg <= SAVE2_END_REGNUM) | |
232 | || (reg >= SAVE3_START_REGNUM && reg <= SAVE3_END_REGNUM))) | |
b71f8719 | 233 | { |
a490f8c1 MM |
234 | pifsr->reg = reg; |
235 | pifsr->offset = (insn & 0x007e) << 1; | |
236 | pifsr->cur_frameoffset = pi->frameoffset; | |
237 | #ifdef DEBUG | |
238 | printf_filtered ("\tSaved register r%d, offset %d", reg, pifsr->offset); | |
239 | #endif | |
b71f8719 MM |
240 | pifsr++; |
241 | } | |
6420594b SG |
242 | |
243 | if ((insn & 0x0780) >= 0x0600) /* Four byte instruction? */ | |
244 | current_pc += 2; | |
a490f8c1 MM |
245 | |
246 | #ifdef DEBUG | |
247 | printf_filtered ("\n"); | |
248 | #endif | |
e5a2ac8b SG |
249 | } |
250 | ||
a638512f SG |
251 | if (pifsr) |
252 | pifsr->framereg = 0; /* Tie off last entry */ | |
253 | ||
a490f8c1 MM |
254 | /* Fix up any offsets to the final offset. If a frame pointer was created, use it |
255 | instead of the stack pointer. */ | |
256 | for (pifsr_tmp = pi->pifsrs; pifsr_tmp && pifsr_tmp != pifsr; pifsr_tmp++) | |
257 | { | |
258 | pifsr_tmp->offset -= pi->frameoffset - pifsr_tmp->cur_frameoffset; | |
259 | pifsr_tmp->framereg = pi->framereg; | |
260 | ||
261 | #ifdef DEBUG | |
262 | printf_filtered ("Saved register r%d, offset = %d, framereg = r%d\n", | |
263 | pifsr_tmp->reg, pifsr_tmp->offset, pifsr_tmp->framereg); | |
264 | #endif | |
265 | } | |
266 | ||
267 | #ifdef DEBUG | |
268 | printf_filtered ("Framereg = r%d, frameoffset = %d\n", pi->framereg, pi->frameoffset); | |
269 | #endif | |
270 | ||
23da411a | 271 | return current_pc; |
e5a2ac8b SG |
272 | } |
273 | ||
dc1b349d MS |
274 | /* Function: init_extra_frame_info |
275 | Setup the frame's frame pointer, pc, and frame addresses for saved | |
276 | registers. Most of the work is done in scan_prologue(). | |
e5a2ac8b | 277 | |
23da411a SG |
278 | Note that when we are called for the last frame (currently active frame), |
279 | that fi->pc and fi->frame will already be setup. However, fi->frame will | |
280 | be valid only if this routine uses FP. For previous frames, fi-frame will | |
281 | always be correct (since that is derived from v850_frame_chain ()). | |
282 | ||
283 | We can be called with the PC in the call dummy under two circumstances. | |
284 | First, during normal backtracing, second, while figuring out the frame | |
dc1b349d | 285 | pointer just prior to calling the target function (see run_stack_dummy). */ |
23da411a SG |
286 | |
287 | void | |
288 | v850_init_extra_frame_info (fi) | |
e5a2ac8b | 289 | struct frame_info *fi; |
e5a2ac8b | 290 | { |
23da411a | 291 | struct prologue_info pi; |
a638512f | 292 | struct pifsr pifsrs[NUM_REGS + 1], *pifsr; |
23da411a SG |
293 | int reg; |
294 | ||
295 | if (fi->next) | |
296 | fi->pc = FRAME_SAVED_PC (fi->next); | |
297 | ||
298 | memset (fi->fsr.regs, '\000', sizeof fi->fsr.regs); | |
299 | ||
300 | /* The call dummy doesn't save any registers on the stack, so we can return | |
301 | now. */ | |
dc1b349d | 302 | if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) |
23da411a | 303 | return; |
ac954805 | 304 | |
a638512f | 305 | pi.pifsrs = pifsrs; |
e5a2ac8b | 306 | |
dc1b349d | 307 | v850_scan_prologue (fi->pc, &pi); |
23da411a | 308 | |
a638512f SG |
309 | if (!fi->next && pi.framereg == SP_REGNUM) |
310 | fi->frame = read_register (pi.framereg) - pi.frameoffset; | |
23da411a | 311 | |
a638512f SG |
312 | for (pifsr = pifsrs; pifsr->framereg; pifsr++) |
313 | { | |
314 | fi->fsr.regs[pifsr->reg] = pifsr->offset + fi->frame; | |
315 | ||
316 | if (pifsr->framereg == SP_REGNUM) | |
317 | fi->fsr.regs[pifsr->reg] += pi.frameoffset; | |
318 | } | |
e5a2ac8b SG |
319 | } |
320 | ||
dc1b349d MS |
321 | /* Function: frame_chain |
322 | Figure out the frame prior to FI. Unfortunately, this involves | |
323 | scanning the prologue of the caller, which will also be done | |
324 | shortly by v850_init_extra_frame_info. For the dummy frame, we | |
325 | just return the stack pointer that was in use at the time the | |
326 | function call was made. */ | |
23da411a | 327 | |
e5a2ac8b SG |
328 | CORE_ADDR |
329 | v850_frame_chain (fi) | |
330 | struct frame_info *fi; | |
331 | { | |
23da411a | 332 | struct prologue_info pi; |
dc1b349d | 333 | CORE_ADDR callers_pc, fp; |
e5a2ac8b SG |
334 | |
335 | /* First, find out who called us */ | |
ac954805 | 336 | callers_pc = FRAME_SAVED_PC (fi); |
dc1b349d | 337 | /* If caller is a call-dummy, then our FP bears no relation to his FP! */ |
ea45efcf | 338 | fp = v850_find_callers_reg (fi, FP_RAW_REGNUM); |
dc1b349d MS |
339 | if (PC_IN_CALL_DUMMY(callers_pc, fp, fp)) |
340 | return fp; /* caller is call-dummy: return oldest value of FP */ | |
ac954805 | 341 | |
dc1b349d MS |
342 | /* Caller is NOT a call-dummy, so everything else should just work. |
343 | Even if THIS frame is a call-dummy! */ | |
a638512f | 344 | pi.pifsrs = NULL; |
e5a2ac8b | 345 | |
dc1b349d | 346 | v850_scan_prologue (callers_pc, &pi); |
e5a2ac8b | 347 | |
23da411a SG |
348 | if (pi.start_function) |
349 | return 0; /* Don't chain beyond the start function */ | |
ac954805 | 350 | |
ea45efcf | 351 | if (pi.framereg == FP_RAW_REGNUM) |
23da411a | 352 | return v850_find_callers_reg (fi, pi.framereg); |
e5a2ac8b | 353 | |
23da411a SG |
354 | return fi->frame - pi.frameoffset; |
355 | } | |
e5a2ac8b | 356 | |
dc1b349d MS |
357 | /* Function: find_callers_reg |
358 | Find REGNUM on the stack. Otherwise, it's in an active register. | |
359 | One thing we might want to do here is to check REGNUM against the | |
360 | clobber mask, and somehow flag it as invalid if it isn't saved on | |
361 | the stack somewhere. This would provide a graceful failure mode | |
362 | when trying to get the value of caller-saves registers for an inner | |
363 | frame. */ | |
e5a2ac8b | 364 | |
23da411a SG |
365 | CORE_ADDR |
366 | v850_find_callers_reg (fi, regnum) | |
367 | struct frame_info *fi; | |
368 | int regnum; | |
369 | { | |
23da411a | 370 | for (; fi; fi = fi->next) |
dc1b349d MS |
371 | if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) |
372 | return generic_read_register_dummy (fi->pc, fi->frame, regnum); | |
23da411a | 373 | else if (fi->fsr.regs[regnum] != 0) |
dc1b349d MS |
374 | return read_memory_unsigned_integer (fi->fsr.regs[regnum], |
375 | REGISTER_RAW_SIZE(regnum)); | |
e5a2ac8b | 376 | |
23da411a | 377 | return read_register (regnum); |
e5a2ac8b SG |
378 | } |
379 | ||
dc1b349d MS |
380 | /* Function: skip_prologue |
381 | Return the address of the first code past the prologue of the function. */ | |
382 | ||
e5a2ac8b SG |
383 | CORE_ADDR |
384 | v850_skip_prologue (pc) | |
385 | CORE_ADDR pc; | |
386 | { | |
387 | CORE_ADDR func_addr, func_end; | |
388 | ||
389 | /* See what the symbol table says */ | |
390 | ||
391 | if (find_pc_partial_function (pc, NULL, &func_addr, &func_end)) | |
392 | { | |
393 | struct symtab_and_line sal; | |
394 | ||
395 | sal = find_pc_line (func_addr, 0); | |
396 | ||
ac954805 | 397 | if (sal.line != 0 && sal.end < func_end) |
e5a2ac8b SG |
398 | return sal.end; |
399 | else | |
ac954805 SG |
400 | /* Either there's no line info, or the line after the prologue is after |
401 | the end of the function. In this case, there probably isn't a | |
402 | prologue. */ | |
e5a2ac8b SG |
403 | return pc; |
404 | } | |
405 | ||
406 | /* We can't find the start of this function, so there's nothing we can do. */ | |
407 | return pc; | |
408 | } | |
409 | ||
dc1b349d MS |
410 | /* Function: pop_frame |
411 | This routine gets called when either the user uses the `return' | |
412 | command, or the call dummy breakpoint gets hit. */ | |
ac954805 SG |
413 | |
414 | void | |
e5a2ac8b SG |
415 | v850_pop_frame (frame) |
416 | struct frame_info *frame; | |
417 | { | |
418 | int regnum; | |
419 | ||
dc1b349d MS |
420 | if (PC_IN_CALL_DUMMY(frame->pc, frame->frame, frame->frame)) |
421 | generic_pop_dummy_frame (); | |
23da411a SG |
422 | else |
423 | { | |
424 | write_register (PC_REGNUM, FRAME_SAVED_PC (frame)); | |
ac954805 | 425 | |
23da411a SG |
426 | for (regnum = 0; regnum < NUM_REGS; regnum++) |
427 | if (frame->fsr.regs[regnum] != 0) | |
428 | write_register (regnum, | |
dc1b349d MS |
429 | read_memory_unsigned_integer (frame->fsr.regs[regnum], |
430 | REGISTER_RAW_SIZE(regnum))); | |
e5a2ac8b | 431 | |
23da411a SG |
432 | write_register (SP_REGNUM, FRAME_FP (frame)); |
433 | } | |
e5a2ac8b | 434 | |
e5a2ac8b | 435 | flush_cached_frames (); |
e5a2ac8b | 436 | } |
ac954805 | 437 | |
dc1b349d MS |
438 | /* Function: push_arguments |
439 | Setup arguments and RP for a call to the target. First four args | |
440 | go in R6->R9, subsequent args go into sp + 16 -> sp + ... Structs | |
441 | are passed by reference. 64 bit quantities (doubles and long | |
442 | longs) may be split between the regs and the stack. When calling a | |
443 | function that returns a struct, a pointer to the struct is passed | |
444 | in as a secret first argument (always in R6). | |
ac954805 | 445 | |
dc1b349d MS |
446 | Stack space for the args has NOT been allocated: that job is up to us. |
447 | */ | |
ac954805 SG |
448 | |
449 | CORE_ADDR | |
450 | v850_push_arguments (nargs, args, sp, struct_return, struct_addr) | |
451 | int nargs; | |
452 | value_ptr *args; | |
453 | CORE_ADDR sp; | |
454 | unsigned char struct_return; | |
455 | CORE_ADDR struct_addr; | |
456 | { | |
457 | int argreg; | |
458 | int argnum; | |
dc1b349d MS |
459 | int len = 0; |
460 | int stack_offset; | |
ac954805 | 461 | |
dc1b349d MS |
462 | /* First, just for safety, make sure stack is aligned */ |
463 | sp &= ~3; | |
464 | ||
465 | /* Now make space on the stack for the args. */ | |
466 | for (argnum = 0; argnum < nargs; argnum++) | |
467 | len += ((TYPE_LENGTH(VALUE_TYPE(args[argnum])) + 3) & ~3); | |
468 | sp -= len; /* possibly over-allocating, but it works... */ | |
469 | /* (you might think we could allocate 16 bytes */ | |
470 | /* less, but the ABI seems to use it all! ) */ | |
687f4e23 | 471 | argreg = ARG0_REGNUM; |
ac954805 | 472 | |
dc1b349d | 473 | /* the struct_return pointer occupies the first parameter-passing reg */ |
ac954805 | 474 | if (struct_return) |
ac954805 | 475 | write_register (argreg++, struct_addr); |
ac954805 | 476 | |
dc1b349d MS |
477 | stack_offset = 16; |
478 | /* The offset onto the stack at which we will start copying parameters | |
479 | (after the registers are used up) begins at 16 rather than at zero. | |
480 | I don't really know why, that's just the way it seems to work. */ | |
481 | ||
482 | /* Now load as many as possible of the first arguments into | |
483 | registers, and push the rest onto the stack. There are 16 bytes | |
484 | in four registers available. Loop thru args from first to last. */ | |
ac954805 SG |
485 | for (argnum = 0; argnum < nargs; argnum++) |
486 | { | |
487 | int len; | |
488 | char *val; | |
dc1b349d | 489 | char valbuf[REGISTER_RAW_SIZE(ARG0_REGNUM)]; |
ac954805 SG |
490 | |
491 | if (TYPE_CODE (VALUE_TYPE (*args)) == TYPE_CODE_STRUCT | |
492 | && TYPE_LENGTH (VALUE_TYPE (*args)) > 8) | |
493 | { | |
494 | store_address (valbuf, 4, VALUE_ADDRESS (*args)); | |
495 | len = 4; | |
496 | val = valbuf; | |
497 | } | |
498 | else | |
499 | { | |
500 | len = TYPE_LENGTH (VALUE_TYPE (*args)); | |
501 | val = (char *)VALUE_CONTENTS (*args); | |
502 | } | |
503 | ||
504 | while (len > 0) | |
687f4e23 | 505 | if (argreg <= ARGLAST_REGNUM) |
ac954805 SG |
506 | { |
507 | CORE_ADDR regval; | |
508 | ||
509 | regval = extract_address (val, REGISTER_RAW_SIZE (argreg)); | |
510 | write_register (argreg, regval); | |
511 | ||
512 | len -= REGISTER_RAW_SIZE (argreg); | |
513 | val += REGISTER_RAW_SIZE (argreg); | |
514 | argreg++; | |
515 | } | |
516 | else | |
517 | { | |
dc1b349d | 518 | write_memory (sp + stack_offset, val, 4); |
ac954805 SG |
519 | |
520 | len -= 4; | |
521 | val += 4; | |
dc1b349d | 522 | stack_offset += 4; |
ac954805 SG |
523 | } |
524 | args++; | |
525 | } | |
dc1b349d MS |
526 | return sp; |
527 | } | |
ac954805 | 528 | |
dc1b349d MS |
529 | /* Function: push_return_address (pc) |
530 | Set up the return address for the inferior function call. | |
531 | Needed for targets where we don't actually execute a JSR/BSR instruction */ | |
532 | ||
dc1b349d MS |
533 | CORE_ADDR |
534 | v850_push_return_address (pc, sp) | |
535 | CORE_ADDR pc; | |
536 | CORE_ADDR sp; | |
537 | { | |
409f64ae | 538 | write_register (RP_REGNUM, CALL_DUMMY_ADDRESS ()); |
ac954805 SG |
539 | return sp; |
540 | } | |
dc1b349d MS |
541 | |
542 | /* Function: frame_saved_pc | |
543 | Find the caller of this frame. We do this by seeing if RP_REGNUM | |
544 | is saved in the stack anywhere, otherwise we get it from the | |
545 | registers. If the inner frame is a dummy frame, return its PC | |
546 | instead of RP, because that's where "caller" of the dummy-frame | |
547 | will be found. */ | |
548 | ||
549 | CORE_ADDR | |
550 | v850_frame_saved_pc (fi) | |
551 | struct frame_info *fi; | |
552 | { | |
553 | if (PC_IN_CALL_DUMMY(fi->pc, fi->frame, fi->frame)) | |
554 | return generic_read_register_dummy(fi->pc, fi->frame, PC_REGNUM); | |
555 | else | |
556 | return v850_find_callers_reg (fi, RP_REGNUM); | |
557 | } | |
558 | ||
559 | void | |
560 | get_saved_register (raw_buffer, optimized, addrp, frame, regnum, lval) | |
561 | char *raw_buffer; | |
562 | int *optimized; | |
563 | CORE_ADDR *addrp; | |
564 | struct frame_info *frame; | |
565 | int regnum; | |
566 | enum lval_type *lval; | |
567 | { | |
568 | generic_get_saved_register (raw_buffer, optimized, addrp, | |
569 | frame, regnum, lval); | |
570 | } | |
571 | ||
572 | ||
573 | /* Function: fix_call_dummy | |
574 | Pokes the callee function's address into the CALL_DUMMY assembly stub. | |
575 | Assumes that the CALL_DUMMY looks like this: | |
576 | jarl <offset24>, r31 | |
577 | trap | |
578 | */ | |
579 | ||
580 | int | |
581 | v850_fix_call_dummy (dummy, sp, fun, nargs, args, type, gcc_p) | |
582 | char *dummy; | |
583 | CORE_ADDR sp; | |
584 | CORE_ADDR fun; | |
585 | int nargs; | |
586 | value_ptr *args; | |
587 | struct type *type; | |
588 | int gcc_p; | |
589 | { | |
590 | long offset24; | |
dc1b349d | 591 | |
409f64ae | 592 | offset24 = (long) fun - (long) entry_point_address (); |
dc1b349d MS |
593 | offset24 &= 0x3fffff; |
594 | offset24 |= 0xff800000; /* jarl <offset24>, r31 */ | |
595 | ||
596 | store_unsigned_integer ((unsigned int *)&dummy[2], 2, offset24 & 0xffff); | |
597 | store_unsigned_integer ((unsigned int *)&dummy[0], 2, offset24 >> 16); | |
598 | return 0; | |
599 | } | |
600 | ||
e2810631 | 601 | void |
dc1b349d | 602 | _initialize_v850_tdep () |
e2810631 SG |
603 | { |
604 | tm_print_insn = print_insn_v850; | |
605 | } |