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.
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)
29 #include <sys/param.h>
33 #include <sys/ioctl.h>
36 #include <sys/ptrace.h>
37 #include <machine/reg.h>
45 fetch_inferior_registers (regno)
48 struct regs inferior_registers;
49 struct fp_state inferior_fp_registers;
50 extern char registers[];
54 ptrace (PTRACE_GETREGS, inferior_pid,
55 (PTRACE_ARG3_TYPE) &inferior_registers);
56 ptrace (PTRACE_GETFPREGS, inferior_pid,
57 (PTRACE_ARG3_TYPE) &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,
95 (PTRACE_ARG3_TYPE) stack);
96 int reg = inferior_registers.r_reg[EAX];
97 inferior_registers.r_reg[EAX] =
98 inferior_registers.r_reg[FP_REGNUM];
99 ptrace (PTRACE_SETREGS, inferior_pid,
100 (PTRACE_ARG3_TYPE) &inferior_registers);
101 ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack,
103 ptrace (PTRACE_SINGLESTEP, inferior_pid, (PTRACE_ARG3_TYPE) stack,
106 ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack,
108 inferior_registers.r_reg[EAX] = reg;
111 ptrace (PTRACE_SETREGS, inferior_pid,
112 (PTRACE_ARG3_TYPE) &inferior_registers);
113 ptrace (PTRACE_SETFPREGS, inferior_pid,
114 (PTRACE_ARG3_TYPE) &inferior_fp_registers);
117 /* Machine-dependent code which would otherwise be in core.c */
118 /* Work with core files, for GDB. */
122 core_file_command (filename, from_tty)
127 extern char registers[];
129 /* Discard all vestiges of any previous core file
130 and mark data and stack spaces as empty. */
142 stack_start = STACK_END_ADDR;
143 stack_end = STACK_END_ADDR;
145 /* Now, if a new core file was specified, open it and digest it. */
149 filename = tilde_expand (filename);
150 make_cleanup (free, filename);
152 if (have_inferior_p ())
153 error ("To look at a core file, you must kill the inferior with \"kill\".");
154 corechan = open (filename, O_RDONLY, 0);
156 perror_with_name (filename);
161 val = myread (corechan, &corestr, sizeof corestr);
163 perror_with_name (filename);
164 if (corestr.c_magic != CORE_MAGIC)
165 error ("\"%s\" does not appear to be a core dump file (magic 0x%x, expected 0x%x)",
166 filename, corestr.c_magic, (int) CORE_MAGIC);
167 else if (sizeof (struct core) != corestr.c_len)
168 error ("\"%s\" has an invalid struct core length (%d, expected %d)",
169 filename, corestr.c_len, (int) sizeof (struct core));
171 data_start = exec_data_start;
172 data_end = data_start + corestr.c_dsize;
173 stack_start = stack_end - corestr.c_ssize;
174 data_offset = sizeof corestr;
175 stack_offset = sizeof corestr + corestr.c_dsize;
177 bcopy (&corestr.c_regs, registers, sizeof corestr.c_regs);
179 bcopy (corestr.c_fpu.f_fpstatus.f_st,
180 ®isters[REGISTER_BYTE (FP0_REGNUM)],
181 sizeof corestr.c_fpu.f_fpstatus.f_st);
182 bcopy (&corestr.c_fpu.f_fpstatus.f_ctrl,
183 ®isters[REGISTER_BYTE (FPC_REGNUM)],
184 sizeof corestr.c_fpu.f_fpstatus -
185 sizeof corestr.c_fpu.f_fpstatus.f_st);
187 /* the struct aouthdr of sun coff is not the struct exec stored
189 bcopy (&corestr.c_aouthdr, &core_aouthdr, sizeof (struct exec));
190 #ifndef COFF_ENCAPSULATE
191 core_aouthdr.magic = corestr.c_aouthdr.a_info;
192 core_aouthdr.vstamp = /*SUNVERSION*/ 31252;
194 printf ("Core file is from \"%s\".\n", corestr.c_cmdname);
195 if (corestr.c_signo > 0)
196 printf ("Program terminated with signal %d, %s.\n",
197 corestr.c_signo, safe_strsignal (corestr.c_signo));
199 if (filename[0] == '/')
200 corefile = savestring (filename, strlen (filename));
203 corefile = concat (current_directory, "/", filename, NULL);
206 set_current_frame ( create_new_frame (read_register (FP_REGNUM),
208 select_frame (get_current_frame (), 0);
213 printf ("No core file now.\n");
216 i387_to_double (from, to)
221 /* push extended mode on 387 stack, then pop in double mode
223 * first, set exception masks so no error is generated -
224 * number will be rounded to inf or 0, if necessary
226 asm ("pushl %eax"); /* grab a stack slot */
227 asm ("fstcw (%esp)"); /* get 387 control word */
228 asm ("movl (%esp),%eax"); /* save old value */
229 asm ("orl $0x3f,%eax"); /* mask all exceptions */
231 asm ("fldcw (%esp)"); /* load new value into 387 */
233 asm ("movl 8(%ebp),%eax");
234 asm ("fldt (%eax)"); /* push extended number on 387 stack */
236 asm ("movl 12(%ebp),%eax");
237 asm ("fstpl (%eax)"); /* pop double */
240 asm ("popl %eax"); /* flush modified control word */
241 asm ("fnclex"); /* clear exceptions */
242 asm ("fldcw (%esp)"); /* restore original control word */
243 asm ("popl %eax"); /* flush saved copy */
246 double_to_i387 (from, to)
250 /* push double mode on 387 stack, then pop in extended mode
251 * no errors are possible because every 64-bit pattern
252 * can be converted to an extended
254 asm ("movl 8(%ebp),%eax");
257 asm ("movl 12(%ebp),%eax");
258 asm ("fstpt (%eax)");
261 #else /* Not sun386 target. */
263 /* These functions shouldn't be called when we're cross-debugging. */
267 fetch_inferior_registers (regno)
274 store_inferior_registers (regno)
281 fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
283 unsigned core_reg_size;
285 unsigned int reg_addr; /* Unused in this version */
289 #endif /* Not sun386 target. */