1 /* Machine-dependent code for host Sun 386i's for GDB, the GNU debugger.
2 Copyright (C) 1986, 1987, 1989, 1991 Free Software Foundation, Inc.
3 Changes for sun386i by Jean Daniel Fekete (jdf@litp.univ-p6-7.fr),
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
22 #if defined (GDB_TARGET_IS_SUN386)
31 #include <sys/param.h>
35 #include <sys/ioctl.h>
38 #include <sys/ptrace.h>
39 #include <machine/reg.h>
47 fetch_inferior_registers (regno)
50 struct regs inferior_registers;
51 struct fp_state inferior_fp_registers;
52 extern char registers[];
56 ptrace (PTRACE_GETREGS, inferior_pid, &inferior_registers);
57 ptrace (PTRACE_GETFPREGS, inferior_pid, &inferior_fp_registers);
59 bcopy (&inferior_registers, registers, sizeof inferior_registers);
61 bcopy (inferior_fp_registers.f_st,®isters[REGISTER_BYTE (FP0_REGNUM)],
62 sizeof inferior_fp_registers.f_st);
63 bcopy (&inferior_fp_registers.f_ctrl,
64 ®isters[REGISTER_BYTE (FPC_REGNUM)],
65 sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);
68 /* Store our register values back into the inferior.
69 If REGNO is -1, do this for all registers.
70 Otherwise, REGNO specifies which register (so we can save time). */
73 store_inferior_registers (regno)
76 struct regs inferior_registers;
77 struct fp_state inferior_fp_registers;
78 extern char registers[];
80 bcopy (registers, &inferior_registers, 20 * 4);
82 bcopy (®isters[REGISTER_BYTE (FP0_REGNUM)],inferior_fp_registers.f_st,
83 sizeof inferior_fp_registers.f_st);
84 bcopy (®isters[REGISTER_BYTE (FPC_REGNUM)],
85 &inferior_fp_registers.f_ctrl,
86 sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);
89 if (regno == FP_REGNUM || regno == -1)
90 /* Storing the frame pointer requires a gross hack, in which an
91 instruction that moves eax into ebp gets single-stepped. */
93 int stack = inferior_registers.r_reg[SP_REGNUM];
94 int stuff = ptrace (PTRACE_PEEKDATA, inferior_pid, stack);
95 int reg = inferior_registers.r_reg[EAX];
96 inferior_registers.r_reg[EAX] =
97 inferior_registers.r_reg[FP_REGNUM];
98 ptrace (PTRACE_SETREGS, inferior_pid, &inferior_registers);
99 ptrace (PTRACE_POKEDATA, inferior_pid, stack, 0xc589);
100 ptrace (PTRACE_SINGLESTEP, inferior_pid, stack, 0);
102 ptrace (PTRACE_POKEDATA, inferior_pid, stack, stuff);
103 inferior_registers.r_reg[EAX] = reg;
106 ptrace (PTRACE_SETREGS, inferior_pid, &inferior_registers);
107 ptrace (PTRACE_SETFPREGS, inferior_pid, &inferior_fp_registers);
110 /* Machine-dependent code which would otherwise be in core.c */
111 /* Work with core files, for GDB. */
115 core_file_command (filename, from_tty)
120 extern char registers[];
122 /* Discard all vestiges of any previous core file
123 and mark data and stack spaces as empty. */
135 stack_start = STACK_END_ADDR;
136 stack_end = STACK_END_ADDR;
138 /* Now, if a new core file was specified, open it and digest it. */
142 filename = tilde_expand (filename);
143 make_cleanup (free, filename);
145 if (have_inferior_p ())
146 error ("To look at a core file, you must kill the inferior with \"kill\".");
147 corechan = open (filename, O_RDONLY, 0);
149 perror_with_name (filename);
154 val = myread (corechan, &corestr, sizeof corestr);
156 perror_with_name (filename);
157 if (corestr.c_magic != CORE_MAGIC)
158 error ("\"%s\" does not appear to be a core dump file (magic 0x%x, expected 0x%x)",
159 filename, corestr.c_magic, (int) CORE_MAGIC);
160 else if (sizeof (struct core) != corestr.c_len)
161 error ("\"%s\" has an invalid struct core length (%d, expected %d)",
162 filename, corestr.c_len, (int) sizeof (struct core));
164 data_start = exec_data_start;
165 data_end = data_start + corestr.c_dsize;
166 stack_start = stack_end - corestr.c_ssize;
167 data_offset = sizeof corestr;
168 stack_offset = sizeof corestr + corestr.c_dsize;
170 bcopy (&corestr.c_regs, registers, sizeof corestr.c_regs);
172 bcopy (corestr.c_fpu.f_fpstatus.f_st,
173 ®isters[REGISTER_BYTE (FP0_REGNUM)],
174 sizeof corestr.c_fpu.f_fpstatus.f_st);
175 bcopy (&corestr.c_fpu.f_fpstatus.f_ctrl,
176 ®isters[REGISTER_BYTE (FPC_REGNUM)],
177 sizeof corestr.c_fpu.f_fpstatus -
178 sizeof corestr.c_fpu.f_fpstatus.f_st);
180 /* the struct aouthdr of sun coff is not the struct exec stored
182 bcopy (&corestr.c_aouthdr, &core_aouthdr, sizeof (struct exec));
183 #ifndef COFF_ENCAPSULATE
184 core_aouthdr.magic = corestr.c_aouthdr.a_info;
185 core_aouthdr.vstamp = /*SUNVERSION*/ 31252;
187 printf ("Core file is from \"%s\".\n", corestr.c_cmdname);
188 if (corestr.c_signo > 0)
189 printf ("Program terminated with signal %d, %s.\n",
191 corestr.c_signo < NSIG
192 ? sys_siglist[corestr.c_signo]
195 if (filename[0] == '/')
196 corefile = savestring (filename, strlen (filename));
199 corefile = concat (current_directory, "/", filename, NULL);
202 set_current_frame ( create_new_frame (read_register (FP_REGNUM),
204 select_frame (get_current_frame (), 0);
209 printf ("No core file now.\n");
212 i387_to_double (from, to)
217 /* push extended mode on 387 stack, then pop in double mode
219 * first, set exception masks so no error is generated -
220 * number will be rounded to inf or 0, if necessary
222 asm ("pushl %eax"); /* grab a stack slot */
223 asm ("fstcw (%esp)"); /* get 387 control word */
224 asm ("movl (%esp),%eax"); /* save old value */
225 asm ("orl $0x3f,%eax"); /* mask all exceptions */
227 asm ("fldcw (%esp)"); /* load new value into 387 */
229 asm ("movl 8(%ebp),%eax");
230 asm ("fldt (%eax)"); /* push extended number on 387 stack */
232 asm ("movl 12(%ebp),%eax");
233 asm ("fstpl (%eax)"); /* pop double */
236 asm ("popl %eax"); /* flush modified control word */
237 asm ("fnclex"); /* clear exceptions */
238 asm ("fldcw (%esp)"); /* restore original control word */
239 asm ("popl %eax"); /* flush saved copy */
242 double_to_i387 (from, to)
246 /* push double mode on 387 stack, then pop in extended mode
247 * no errors are possible because every 64-bit pattern
248 * can be converted to an extended
250 asm ("movl 8(%ebp),%eax");
253 asm ("movl 12(%ebp),%eax");
254 asm ("fstpt (%eax)");
257 #else /* Not sun386 target. */
259 /* These functions shouldn't be called when we're cross-debugging. */
263 fetch_inferior_registers (regno)
270 store_inferior_registers (regno)
277 fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
279 unsigned core_reg_size;
281 unsigned int reg_addr; /* Unused in this version */
285 #endif /* Not sun386 target. */