/* Native-dependent code for BSD Unix running on i386's, for GDB. Copyright 1988, 1989, 1991, 1992 Free Software Foundation, Inc. This file is part of GDB. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. $Id: i386b-nat.c,v 1.3 1994/05/18 12:43:13 pk Exp $ */ #include #include #include #include #include #include #include #include "defs.h" /* this table must line up with REGISTER_NAMES in tm-i386.h */ /* symbols like 'tEAX' come from */ static int tregmap[] = { tEAX, tECX, tEDX, tEBX, tESP, tEBP, tESI, tEDI, tEIP, tEFLAGS, tCS, tSS }; /* blockend is the value of u.u_ar0, and points to the place where ES is stored. */ int i386_register_u_addr (blockend, regnum) int blockend; int regnum; { return (blockend + 4 * tregmap[regnum]); } #define fpstate save87 #define U_FPSTATE(u) u.u_pcb.pcb_savefpu static void i387_to_double (from, to) char *from; char *to; { long *lp; /* push extended mode on 387 stack, then pop in double mode * * first, set exception masks so no error is generated - * number will be rounded to inf or 0, if necessary */ asm ("pushl %eax"); /* grab a stack slot */ asm ("fstcw (%esp)"); /* get 387 control word */ asm ("movl (%esp),%eax"); /* save old value */ asm ("orl $0x3f,%eax"); /* mask all exceptions */ asm ("pushl %eax"); asm ("fldcw (%esp)"); /* load new value into 387 */ asm ("movl 8(%ebp),%eax"); asm ("fldt (%eax)"); /* push extended number on 387 stack */ asm ("fwait"); asm ("movl 12(%ebp),%eax"); asm ("fstpl (%eax)"); /* pop double */ asm ("fwait"); asm ("popl %eax"); /* flush modified control word */ asm ("fnclex"); /* clear exceptions */ asm ("fldcw (%esp)"); /* restore original control word */ asm ("popl %eax"); /* flush saved copy */ } static void double_to_i387 (from, to) char *from; char *to; { /* push double mode on 387 stack, then pop in extended mode * no errors are possible because every 64-bit pattern * can be converted to an extended */ asm ("movl 8(%ebp),%eax"); asm ("fldl (%eax)"); asm ("fwait"); asm ("movl 12(%ebp),%eax"); asm ("fstpt (%eax)"); asm ("fwait"); } struct env387 { unsigned short control; unsigned short r0; unsigned short status; unsigned short r1; unsigned short tag; unsigned short r2; unsigned long eip; unsigned short code_seg; unsigned short opcode; unsigned long operand; unsigned short operand_seg; unsigned short r3; unsigned char regs[8][10]; }; void print_387_control_word (control) unsigned int control; { printf ("control 0x%04x: ", control); printf ("compute to "); switch ((control >> 8) & 3) { case 0: printf ("24 bits; "); break; case 1: printf ("(bad); "); break; case 2: printf ("53 bits; "); break; case 3: printf ("64 bits; "); break; } printf ("round "); switch ((control >> 10) & 3) { case 0: printf ("NEAREST; "); break; case 1: printf ("DOWN; "); break; case 2: printf ("UP; "); break; case 3: printf ("CHOP; "); break; } if (control & 0x3f) { printf ("mask:"); if (control & 0x0001) printf (" INVALID"); if (control & 0x0002) printf (" DENORM"); if (control & 0x0004) printf (" DIVZ"); if (control & 0x0008) printf (" OVERF"); if (control & 0x0010) printf (" UNDERF"); if (control & 0x0020) printf (" LOS"); printf (";"); } printf ("\n"); if (control & 0xe080) printf ("warning: reserved bits on 0x%x\n", control & 0xe080); } void print_387_status_word (status) unsigned int status; { printf ("status 0x%04x: ", status); if (status & 0xff) { printf ("exceptions:"); if (status & 0x0001) printf (" INVALID"); if (status & 0x0002) printf (" DENORM"); if (status & 0x0004) printf (" DIVZ"); if (status & 0x0008) printf (" OVERF"); if (status & 0x0010) printf (" UNDERF"); if (status & 0x0020) printf (" LOS"); if (status & 0x0040) printf (" FPSTACK"); printf ("; "); } printf ("flags: %d%d%d%d; ", (status & 0x4000) != 0, (status & 0x0400) != 0, (status & 0x0200) != 0, (status & 0x0100) != 0); printf ("top %d\n", (status >> 11) & 7); } static void print_387_status (status, ep) unsigned short status; struct env387 *ep; { int i; int bothstatus; int top; int fpreg; unsigned char *p; bothstatus = ((status != 0) && (ep->status != 0)); if (status != 0) { if (bothstatus) printf ("u: "); print_387_status_word ((unsigned int)status); } if (ep->status != 0) { if (bothstatus) printf ("e: "); print_387_status_word ((unsigned int)ep->status); } print_387_control_word ((unsigned int)ep->control); printf ("last exception: "); printf ("opcode 0x%x; ", ep->opcode); printf ("pc 0x%x:0x%x; ", ep->code_seg, ep->eip); printf ("operand 0x%x:0x%x\n", ep->operand_seg, ep->operand); top = (ep->status >> 11) & 7; printf (" regno tag msb lsb value\n"); for (fpreg = 7; fpreg >= 0; fpreg--) { int st_regno; double val; /* The physical regno `fpreg' is only relevant as an index into the * tag word. Logical `%st' numbers are required for indexing `p->regs. */ st_regno = (fpreg + 8 - top) & 0x7; printf ("%%st(%d) %s ", st_regno, fpreg == top ? "=>" : " "); switch ((ep->tag >> (fpreg * 2)) & 3) { case 0: printf ("valid "); break; case 1: printf ("zero "); break; case 2: printf ("trap "); break; case 3: printf ("empty "); break; } for (i = 9; i >= 0; i--) printf ("%02x", ep->regs[st_regno][i]); i387_to_double (ep->regs[st_regno], (char *)&val); printf (" %g\n", val); } } void i386_float_info () { struct user u; /* just for address computations */ int i; /* fpstate defined in */ struct fpstate *fpstatep; char buf[sizeof (struct fpstate) + 2 * sizeof (int)]; unsigned int uaddr; char fpvalid; unsigned int rounded_addr; unsigned int rounded_size; /*extern int corechan;*/ int skip; extern int inferior_pid; uaddr = (char *)&U_FPSTATE(u) - (char *)&u; if (inferior_pid) { int *ip; rounded_addr = uaddr & -sizeof (int); rounded_size = (((uaddr + sizeof (struct fpstate)) - uaddr) + sizeof (int) - 1) / sizeof (int); skip = uaddr - rounded_addr; ip = (int *)buf; for (i = 0; i < rounded_size; i++) { *ip++ = ptrace (PT_READ_U, inferior_pid, (caddr_t)rounded_addr, 0); rounded_addr += sizeof (int); } } else { printf("float info: can't do a core file (yet)\n"); return; #if 0 if (lseek (corechan, uaddr, 0) < 0) perror_with_name ("seek on core file"); if (myread (corechan, buf, sizeof (struct fpstate)) < 0) perror_with_name ("read from core file"); skip = 0; #endif } print_387_status (0, (struct env387 *)buf); } void fetch_kcore_registers (pcb) struct pcb *pcb; { int i; int *pcb_regs = (int *)pcb; int eip; /* * get the register values out of the sys pcb and * store them where `read_register' will find them. */ for (i = 0; i < 8; ++i) supply_register(i, &pcb_regs[i+10]); supply_register(8, &pcb_regs[8]); /* eip */ supply_register(9, &pcb_regs[9]); /* eflags */ for (i = 10; i < 13; ++i) /* cs, ss, ds */ supply_register(i, &pcb_regs[i+9]); supply_register(13, &pcb_regs[18]); /* es */ for (i = 14; i < 16; ++i) /* fs, gs */ supply_register(i, &pcb_regs[i+8]); /* Hmm... */ if (target_read_memory(pcb_regs[5+10]+4, &eip, sizeof eip, 0)) error("Cannot read PC."); supply_register(8, &eip); /* eip */ /* XXX 80387 registers? */ } void clear_regs() { return; }