a964cd4bba
Implemented reading of %fs and %gs from core files. Print weird floating point values better. We have to convert long doubles to doubles here because of limitations and bugs in printf() and floatformat_to_double() (long doubles aren't really supported and naive converion to double causes exceptions). Conversion loses information about weird formats (everything becomes a quiet NaN), and printf() doesn't know about different types of NaNs anyway.
402 lines
11 KiB
C
402 lines
11 KiB
C
/* Native-dependent code for BSD Unix running on i386's, for GDB.
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Copyright 1988, 1989, 1991, 1992, 1994, 1996 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include <sys/types.h>
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#include <sys/ptrace.h>
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#include <machine/reg.h>
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#include <machine/frame.h>
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#include <sys/param.h>
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#include <sys/user.h>
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#include "gdbcore.h"
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#include "value.h"
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#include "inferior.h"
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/* this table must line up with REGISTER_NAMES in tm-i386v.h */
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/* symbols like 'tEAX' come from <machine/reg.h> */
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static int tregmap[] =
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{
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tEAX, tECX, tEDX, tEBX,
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tESP, tEBP, tESI, tEDI,
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tEIP, tEFLAGS, tCS, tSS,
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tDS, tES, tFS, tGS,
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};
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static struct save87 pcb_savefpu;
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void
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fetch_inferior_registers (regno)
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int regno;
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{
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struct reg inferior_registers; /* ptrace order, not gcc/gdb order */
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int r;
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ptrace (PT_GETREGS, inferior_pid,
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(PTRACE_ARG3_TYPE) &inferior_registers, 0);
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for (r = 0; r < NUM_REGS; r++)
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memcpy (®isters[REGISTER_BYTE (r)], ((int *)&inferior_registers) + tregmap[r], 4);
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registers_fetched ();
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}
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void
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store_inferior_registers (regno)
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int regno;
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{
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struct reg inferior_registers; /* ptrace order, not gcc/gdb order */
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int r;
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for (r = 0; r < NUM_REGS; r++)
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memcpy (((int *)&inferior_registers) + tregmap[r], ®isters[REGISTER_BYTE (r)], 4);
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ptrace (PT_SETREGS, inferior_pid,
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(PTRACE_ARG3_TYPE) &inferior_registers, 0);
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}
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/* Extract the register values out of the core file and store
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them where `read_register' will find them.
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Extract the floating point state out of the core file and store
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it where `float_info' will find it.
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CORE_REG_SECT points to the register values themselves, read into memory.
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CORE_REG_SIZE is the size of that area.
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WHICH says which set of registers we are handling (0 = int, 2 = float
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on machines where they are discontiguous).
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REG_ADDR is the offset from u.u_ar0 to the register values relative to
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core_reg_sect. This is used with old-fashioned core files to
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locate the registers in a large upage-plus-stack ".reg" section.
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Original upage address X is at location core_reg_sect+x+reg_addr.
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*/
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static void
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fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
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char *core_reg_sect;
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unsigned core_reg_size;
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int which;
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CORE_ADDR reg_addr;
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{
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register int regno;
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register int cregno;
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register int addr;
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int bad_reg = -1;
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int offset;
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struct user *tmp_uaddr;
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/*
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* First get virtual address of user structure. Then calculate offset.
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*/
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memcpy(&tmp_uaddr,
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&((struct user *) core_reg_sect)->u_kproc.kp_proc.p_addr,
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sizeof(tmp_uaddr));
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offset = -reg_addr - (int) tmp_uaddr;
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for (regno = 0; regno < NUM_REGS; regno++)
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{
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cregno = tregmap[regno];
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if (cregno == tFS)
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addr = offsetof (struct user, u_pcb) + offsetof (struct pcb, pcb_fs);
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else if (cregno == tGS)
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addr = offsetof (struct user, u_pcb) + offsetof (struct pcb, pcb_gs);
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else
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addr = offset + 4 * cregno;
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if (addr < 0 || addr >= core_reg_size)
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{
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if (bad_reg < 0)
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bad_reg = regno;
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}
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else
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{
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supply_register (regno, core_reg_sect + addr);
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}
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}
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if (bad_reg >= 0)
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{
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error ("Register %s not found in core file.", reg_names[bad_reg]);
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}
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addr = offsetof (struct user, u_pcb) + offsetof (struct pcb, pcb_savefpu);
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memcpy (&pcb_savefpu, core_reg_sect + addr, sizeof pcb_savefpu);
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}
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#ifdef FLOAT_INFO
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#include "expression.h"
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#include "language.h" /* for local_hex_string */
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#include "floatformat.h"
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#include <sys/param.h>
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#include <signal.h>
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#include <sys/ioctl.h>
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#include <fcntl.h>
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#include <a.out.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <sys/uio.h>
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#define curpcb Xcurpcb /* XXX avoid leaking declaration from pcb.h */
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#include <sys/user.h>
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#undef curpcb
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#include <sys/file.h>
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#include "gdb_stat.h"
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#include <sys/ptrace.h>
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extern void print_387_control_word (); /* i387-tdep.h */
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extern void print_387_status_word ();
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#define fpstate save87
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#define U_FPSTATE(u) u.u_pcb.pcb_savefpu
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static void
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i387_to_double (from, to)
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char *from;
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char *to;
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{
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long *lp;
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/* push extended mode on 387 stack, then pop in double mode
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*
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* first, set exception masks so no error is generated -
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* number will be rounded to inf or 0, if necessary
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*/
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asm ("pushl %eax"); /* grab a stack slot */
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asm ("fstcw (%esp)"); /* get 387 control word */
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asm ("movl (%esp),%eax"); /* save old value */
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asm ("orl $0x3f,%eax"); /* mask all exceptions */
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asm ("pushl %eax");
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asm ("fldcw (%esp)"); /* load new value into 387 */
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asm ("movl 8(%ebp),%eax");
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asm ("fldt (%eax)"); /* push extended number on 387 stack */
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asm ("fwait");
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asm ("movl 12(%ebp),%eax");
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asm ("fstpl (%eax)"); /* pop double */
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asm ("fwait");
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asm ("popl %eax"); /* flush modified control word */
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asm ("fnclex"); /* clear exceptions */
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asm ("fldcw (%esp)"); /* restore original control word */
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asm ("popl %eax"); /* flush saved copy */
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}
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struct env387
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{
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unsigned short control;
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unsigned short r0;
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unsigned short status;
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unsigned short r1;
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unsigned short tag;
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unsigned short r2;
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unsigned long eip;
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unsigned short code_seg;
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unsigned short opcode;
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unsigned long operand;
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unsigned short operand_seg;
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unsigned short r3;
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unsigned char regs[8][10];
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};
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static void
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print_387_status (status, ep)
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unsigned short status;
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struct env387 *ep;
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{
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int i;
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int bothstatus;
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int top;
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int fpreg;
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bothstatus = ((status != 0) && (ep->status != 0));
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if (status != 0)
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{
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if (bothstatus)
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printf_unfiltered ("u: ");
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print_387_status_word ((unsigned int)status);
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}
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if (ep->status != 0)
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{
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if (bothstatus)
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printf_unfiltered ("e: ");
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print_387_status_word ((unsigned int)ep->status);
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}
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print_387_control_word ((unsigned int)ep->control);
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printf_unfiltered ("last instruction: ");
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printf_unfiltered ("opcode %s; ", local_hex_string(ep->opcode));
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printf_unfiltered ("pc %s:", local_hex_string(ep->code_seg));
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printf_unfiltered ("%s; ", local_hex_string(ep->eip));
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printf_unfiltered ("operand %s", local_hex_string(ep->operand_seg));
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printf_unfiltered (":%s\n", local_hex_string(ep->operand));
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top = (ep->status >> 11) & 7;
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printf_unfiltered (" regno tag msb lsb value\n");
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for (fpreg = 7; fpreg >= 0; fpreg--)
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{
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int exp;
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int mantissa_or;
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int normal;
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char *sign;
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int st_regno;
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unsigned short *usregs;
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double val;
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/* The physical regno `fpreg' is only relevant as an index into the
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* tag word. Logical `%st' numbers are required for indexing ep->regs.
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*/
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st_regno = (fpreg + 8 - top) & 7;
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printf_unfiltered ("%%st(%d) %s ", st_regno, fpreg == top ? "=>" : " ");
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switch ((ep->tag >> (fpreg * 2)) & 3)
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{
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case 0: printf_unfiltered ("valid "); break;
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case 1: printf_unfiltered ("zero "); break;
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case 2: printf_unfiltered ("trap "); break;
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case 3: printf_unfiltered ("empty "); break;
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}
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for (i = 9; i >= 0; i--)
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printf_unfiltered ("%02x", ep->regs[st_regno][i]);
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printf_unfiltered (" ");
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/*
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* Handle weird cases better than floatformat_to_double () and
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* printf ().
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*/
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usregs = (unsigned short *) ep->regs[st_regno];
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sign = usregs[4] & 0x8000 ? "-" : "";
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exp = usregs[4] & 0x7fff;
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normal = usregs[3] & 0x8000;
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mantissa_or = usregs[0] | usregs[1] | usregs[2] | (usregs[3] & 0x7fff);
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if (exp == 0)
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{
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if (normal)
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printf_unfiltered ("Pseudo Denormal (0 as a double)");
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else if (mantissa_or == 0)
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printf_unfiltered ("%s0", sign);
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else
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printf_unfiltered ("Denormal (0 as a double)");
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}
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else if (exp == 0x7fff)
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{
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if (!normal)
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printf_unfiltered ("Pseudo ");
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if (mantissa_or == 0)
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printf_unfiltered ("%sInf", sign);
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else
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printf_unfiltered ("%s NaN",
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usregs[3] & 0x4000 ? "Quiet" : "Signaling");
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if (!normal)
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printf_unfiltered (" (NaN)");
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}
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else if (!normal)
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printf_unfiltered ("Unnormal (NaN)");
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else
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{
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#if 0
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/* Use this we stop trapping on overflow. */
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floatformat_to_double(&floatformat_i387_ext,
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(char *) ep->regs[st_regno], &val);
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#else
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i387_to_double((char *) ep->regs[st_regno], (char *) &val);
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#endif
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printf_unfiltered ("%g", val);
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}
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printf_unfiltered ("\n");
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}
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}
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void
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i386_float_info ()
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{
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struct user u; /* just for address computations */
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int i;
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/* fpstate defined in <sys/user.h> */
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struct fpstate *fpstatep;
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char buf[sizeof (struct fpstate) + 2 * sizeof (int)];
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unsigned int uaddr;
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char fpvalid;
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unsigned int rounded_addr;
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unsigned int rounded_size;
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/*extern int corechan;*/
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int skip;
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extern int inferior_pid;
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uaddr = (char *)&U_FPSTATE(u) - (char *)&u;
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if (inferior_pid)
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{
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int *ip;
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rounded_addr = uaddr & -sizeof (int);
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rounded_size = (((uaddr + sizeof (struct fpstate)) - uaddr) +
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sizeof (int) - 1) / sizeof (int);
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skip = uaddr - rounded_addr;
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ip = (int *)buf;
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for (i = 0; i < rounded_size; i++)
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{
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*ip++ = ptrace (PT_READ_U, inferior_pid, (caddr_t)rounded_addr, 0);
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rounded_addr += sizeof (int);
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}
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fpstatep = (struct fpstate *)(buf + skip);
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}
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else
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fpstatep = &pcb_savefpu;
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print_387_status (fpstatep->sv_ex_sw, (struct env387 *)fpstatep);
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}
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#endif /* FLOAT_INFO */
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int
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kernel_u_size ()
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{
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return (sizeof (struct user));
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}
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#ifdef SETUP_ARBITRARY_FRAME
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#include "frame.h"
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struct frame_info *
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setup_arbitrary_frame (argc, argv)
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int argc;
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CORE_ADDR *argv;
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{
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if (argc != 2)
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error ("i386 frame specifications require two arguments: sp and pc");
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return create_new_frame (argv[0], argv[1]);
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}
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#endif /* SETUP_ARBITRARY_FRAME */
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/* Register that we are able to handle aout (trad-core) file formats. */
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static struct core_fns aout_core_fns =
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{
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bfd_target_unknown_flavour,
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fetch_core_registers,
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NULL
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};
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void
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_initialize_core_aout ()
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{
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add_core_fns (&aout_core_fns);
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}
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