1 /* Host-dependent code for SPARC host systems, for GDB, the GNU debugger.
2 Copyright 1986, 1987, 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
20 /* This code only compiles when we have the definitions in tm-sparc.h. */
22 #define TM_FILE_OVERRIDE
29 #include <sys/param.h>
30 #include <sys/ptrace.h>
31 #include <machine/reg.h>
36 extern char register_valid[];
38 /* We don't store all registers immediately when requested, since they
39 get sent over in large chunks anyway. Instead, we accumulate most
40 of the changes and send them over once. "deferred_stores" keeps
41 track of which sets of registers we have locally-changed copies of,
42 so we only need send the groups that have changed. */
48 int deferred_stores = 0; /* Cumulates stores we want to do eventually. */
50 /* Fetch one or more registers from the inferior. REGNO == -1 to get
51 them all. We actually fetch more than requested, when convenient,
52 marking them as valid so we won't fetch them again. */
54 fetch_inferior_registers (regno)
57 struct regs inferior_registers;
58 struct fp_status inferior_fp_registers;
61 /* We should never be called with deferred stores, because a prerequisite
62 for writing regs is to have fetched them all (PREPARE_TO_STORE), sigh. */
63 if (deferred_stores) abort();
67 /* Global and Out regs are fetched directly, as well as the control
68 registers. If we're getting one of the in or local regs,
69 and the stack pointer has not yet been fetched,
70 we have to do that first, since they're found in memory relative
71 to the stack pointer. */
72 if (regno < O7_REGNUM /* including -1 */
74 || (!register_valid[SP_REGNUM] && regno < I7_REGNUM))
76 if (0 != ptrace (PTRACE_GETREGS, inferior_pid, &inferior_registers))
77 perror("ptrace_getregs");
79 registers[REGISTER_BYTE (0)] = 0;
80 bcopy (&inferior_registers.r_g1, ®isters[REGISTER_BYTE (1)], 15 * REGISTER_RAW_SIZE (G0_REGNUM));
81 *(int *)®isters[REGISTER_BYTE (PS_REGNUM)] = inferior_registers.r_ps;
82 *(int *)®isters[REGISTER_BYTE (PC_REGNUM)] = inferior_registers.r_pc;
83 *(int *)®isters[REGISTER_BYTE (NPC_REGNUM)] = inferior_registers.r_npc;
84 *(int *)®isters[REGISTER_BYTE (Y_REGNUM)] = inferior_registers.r_y;
86 for (i = G0_REGNUM; i <= O7_REGNUM; i++)
87 register_valid[i] = 1;
88 register_valid[Y_REGNUM] = 1;
89 register_valid[PS_REGNUM] = 1;
90 register_valid[PC_REGNUM] = 1;
91 register_valid[NPC_REGNUM] = 1;
92 /* If we don't set these valid, read_register_bytes() rereads
93 all the regs every time it is called! FIXME. */
94 register_valid[WIM_REGNUM] = 1; /* Not true yet, FIXME */
95 register_valid[TBR_REGNUM] = 1; /* Not true yet, FIXME */
96 register_valid[FPS_REGNUM] = 1; /* Not true yet, FIXME */
97 register_valid[CPS_REGNUM] = 1; /* Not true yet, FIXME */
100 /* Floating point registers */
101 if (regno == -1 || (regno >= FP0_REGNUM && regno <= FP0_REGNUM + 31))
103 if (0 != ptrace (PTRACE_GETFPREGS, inferior_pid, &inferior_fp_registers))
104 perror("ptrace_getfpregs");
105 bcopy (&inferior_fp_registers, ®isters[REGISTER_BYTE (FP0_REGNUM)],
106 sizeof inferior_fp_registers.fpu_fr);
107 /* bcopy (&inferior_fp_registers.Fpu_fsr,
108 ®isters[REGISTER_BYTE (FPS_REGNUM)],
109 sizeof (FPU_FSR_TYPE)); FIXME??? -- gnu@cyg */
110 for (i = FP0_REGNUM; i <= FP0_REGNUM+31; i++)
111 register_valid[i] = 1;
112 register_valid[FPS_REGNUM] = 1;
115 /* These regs are saved on the stack by the kernel. Only read them
116 all (16 ptrace calls!) if we really need them. */
119 target_xfer_memory (*(CORE_ADDR*)®isters[REGISTER_BYTE (SP_REGNUM)],
120 ®isters[REGISTER_BYTE (L0_REGNUM)],
121 16*REGISTER_RAW_SIZE (L0_REGNUM), 0);
122 for (i = L0_REGNUM; i <= I7_REGNUM; i++)
123 register_valid[i] = 1;
125 else if (regno >= L0_REGNUM && regno <= I7_REGNUM)
127 CORE_ADDR sp = *(CORE_ADDR*)®isters[REGISTER_BYTE (SP_REGNUM)];
128 i = REGISTER_BYTE (regno);
129 if (register_valid[regno])
130 printf("register %d valid and read\n", regno);
131 target_xfer_memory (sp + i - REGISTER_BYTE (L0_REGNUM),
132 ®isters[i], REGISTER_RAW_SIZE (regno), 0);
133 register_valid[regno] = 1;
137 /* Store our register values back into the inferior.
138 If REGNO is -1, do this for all registers.
139 Otherwise, REGNO specifies which register (so we can save time). */
142 store_inferior_registers (regno)
145 struct regs inferior_registers;
146 struct fp_status inferior_fp_registers;
147 int wanna_store = INT_REGS + STACK_REGS + FP_REGS;
149 /* First decide which pieces of machine-state we need to modify.
150 Default for regno == -1 case is all pieces. */
152 if (FP0_REGNUM <= regno && regno < FP0_REGNUM + 32)
154 wanna_store = FP_REGS;
158 if (regno == SP_REGNUM)
159 wanna_store = INT_REGS + STACK_REGS;
160 else if (regno < L0_REGNUM || regno > I7_REGNUM)
161 wanna_store = INT_REGS;
163 wanna_store = STACK_REGS;
166 /* See if we're forcing the stores to happen now, or deferring. */
169 wanna_store = deferred_stores;
174 if (wanna_store == STACK_REGS)
176 /* Fall through and just store one stack reg. If we deferred
177 it, we'd have to store them all, or remember more info. */
181 deferred_stores |= wanna_store;
186 if (wanna_store & STACK_REGS)
188 CORE_ADDR sp = *(CORE_ADDR *)®isters[REGISTER_BYTE (SP_REGNUM)];
190 if (regno < 0 || regno == SP_REGNUM)
192 if (!register_valid[L0_REGNUM+5]) abort();
193 target_xfer_memory (sp,
194 ®isters[REGISTER_BYTE (L0_REGNUM)],
195 16*REGISTER_RAW_SIZE (L0_REGNUM), 1);
199 if (!register_valid[regno]) abort();
200 target_xfer_memory (sp + REGISTER_BYTE (regno) - REGISTER_BYTE (L0_REGNUM),
201 ®isters[REGISTER_BYTE (regno)],
202 REGISTER_RAW_SIZE (regno), 1);
207 if (wanna_store & INT_REGS)
209 if (!register_valid[G1_REGNUM]) abort();
211 bcopy (®isters[REGISTER_BYTE (G1_REGNUM)],
212 &inferior_registers.r_g1, 15 * REGISTER_RAW_SIZE (G1_REGNUM));
214 inferior_registers.r_ps =
215 *(int *)®isters[REGISTER_BYTE (PS_REGNUM)];
216 inferior_registers.r_pc =
217 *(int *)®isters[REGISTER_BYTE (PC_REGNUM)];
218 inferior_registers.r_npc =
219 *(int *)®isters[REGISTER_BYTE (NPC_REGNUM)];
220 inferior_registers.r_y =
221 *(int *)®isters[REGISTER_BYTE (Y_REGNUM)];
223 if (0 != ptrace (PTRACE_SETREGS, inferior_pid, &inferior_registers))
224 perror("ptrace_setregs");
227 if (wanna_store & FP_REGS)
229 if (!register_valid[FP0_REGNUM+9]) abort();
230 bcopy (®isters[REGISTER_BYTE (FP0_REGNUM)],
231 &inferior_fp_registers,
232 sizeof inferior_fp_registers.fpu_fr);
234 /* bcopy (®isters[REGISTER_BYTE (FPS_REGNUM)],
235 &inferior_fp_registers.Fpu_fsr,
236 sizeof (FPU_FSR_TYPE));
239 ptrace (PTRACE_SETFPREGS, inferior_pid, &inferior_fp_registers))
240 perror("ptrace_setfpregs");
245 fetch_core_registers (core_reg_sect, core_reg_size, which, ignore)
247 unsigned core_reg_size;
249 unsigned int ignore; /* reg addr, unused in this version */
254 /* Integer registers */
256 #define gregs ((struct regs *)core_reg_sect)
257 /* G0 *always* holds 0. */
258 *(int *)®isters[REGISTER_BYTE (0)] = 0;
260 /* The globals and output registers. */
262 ®isters[REGISTER_BYTE (G1_REGNUM)],
263 15 * REGISTER_RAW_SIZE (G1_REGNUM));
264 *(int *)®isters[REGISTER_BYTE (PS_REGNUM)] = gregs->r_ps;
265 *(int *)®isters[REGISTER_BYTE (PC_REGNUM)] = gregs->r_pc;
266 *(int *)®isters[REGISTER_BYTE (NPC_REGNUM)] = gregs->r_npc;
267 *(int *)®isters[REGISTER_BYTE (Y_REGNUM)] = gregs->r_y;
269 /* My best guess at where to get the locals and input
270 registers is exactly where they usually are, right above
271 the stack pointer. If the core dump was caused by a bus error
272 from blowing away the stack pointer (as is possible) then this
273 won't work, but it's worth the try. */
277 sp = *(int *)®isters[REGISTER_BYTE (SP_REGNUM)];
278 if (0 != target_read_memory (sp, ®isters[REGISTER_BYTE (L0_REGNUM)],
279 16 * REGISTER_RAW_SIZE (L0_REGNUM)))
281 /* fprintf so user can still use gdb */
283 "Couldn't read input and local registers from core file\n");
286 } else if (which == 2) {
288 /* Floating point registers */
290 #define fpuregs ((struct fpu *) core_reg_sect)
291 if (core_reg_size >= sizeof (struct fpu))
293 bcopy (fpuregs->fpu_regs,
294 ®isters[REGISTER_BYTE (FP0_REGNUM)],
295 sizeof (fpuregs->fpu_regs));
296 bcopy (&fpuregs->fpu_fsr,
297 ®isters[REGISTER_BYTE (FPS_REGNUM)],
298 sizeof (FPU_FSR_TYPE));
301 fprintf (stderr, "Couldn't read float regs from core file\n");