/* Intel 386 native support. Copyright (C) 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "defs.h" #include "frame.h" #include "inferior.h" #include "language.h" #include "gdbcore.h" #ifdef USG #include <sys/types.h> #endif #include <sys/param.h> #include <sys/dir.h> #include <signal.h> #include <sys/user.h> #include <sys/ioctl.h> #include <fcntl.h> #include <sys/file.h> #include "gdb_stat.h" #include <stddef.h> #include <sys/ptrace.h> /* Does AIX define this in <errno.h>? */ extern int errno; #ifndef NO_SYS_REG_H #include <sys/reg.h> #endif #include "floatformat.h" #include "target.h" static void fetch_core_registers PARAMS ((char *, unsigned, int, CORE_ADDR)); /* this table must line up with REGISTER_NAMES in tm-i386v.h */ /* symbols like 'EAX' come from <sys/reg.h> */ static int regmap[] = { EAX, ECX, EDX, EBX, USP, EBP, ESI, EDI, EIP, EFL, CS, SS, DS, ES, FS, GS, }; /* blockend is the value of u.u_ar0, and points to the * place where GS is stored */ int i386_register_u_addr (blockend, regnum) int blockend; int regnum; { #if 0 /* this will be needed if fp registers are reinstated */ /* for now, you can look at them with 'info float' * sys5 wont let you change them with ptrace anyway */ if (regnum >= FP0_REGNUM && regnum <= FP7_REGNUM) { int ubase, fpstate; struct user u; ubase = blockend + 4 * (SS + 1) - KSTKSZ; fpstate = ubase + ((char *)&u.u_fpstate - (char *)&u); return (fpstate + 0x1c + 10 * (regnum - FP0_REGNUM)); } else #endif return (blockend + 4 * regmap[regnum]); } /* The code below only work on the aix ps/2 (i386-ibm-aix) - * mtranle@paris - Sat Apr 11 10:34:12 1992 */ 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]; }; static 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_unfiltered ("u: "); print_387_status_word (status); } if (ep->status != 0) { if (bothstatus) printf_unfiltered ("e: "); print_387_status_word (ep->status); } print_387_control_word (ep->control); printf_unfiltered ("last exception: "); printf_unfiltered ("opcode %s; ", local_hex_string(ep->opcode)); printf_unfiltered ("pc %s:", local_hex_string(ep->code_seg)); printf_unfiltered ("%s; ", local_hex_string(ep->eip)); printf_unfiltered ("operand %s", local_hex_string(ep->operand_seg)); printf_unfiltered (":%s\n", local_hex_string(ep->operand)); top = ((ep->status >> 11) & 7); printf_unfiltered ("regno tag msb lsb value\n"); for (fpreg = 7; fpreg >= 0; fpreg--) { double val; printf_unfiltered ("%s %d: ", fpreg == top ? "=>" : " ", fpreg); switch ((ep->tag >> ((7 - fpreg) * 2)) & 3) { case 0: printf_unfiltered ("valid "); break; case 1: printf_unfiltered ("zero "); break; case 2: printf_unfiltered ("trap "); break; case 3: printf_unfiltered ("empty "); break; } for (i = 9; i >= 0; i--) printf_unfiltered ("%02x", ep->regs[fpreg][i]); i387_to_double ((char *)ep->regs[fpreg], (char *)&val); printf_unfiltered (" %#g\n", val); } } static struct env387 core_env387; void i386_float_info () { struct env387 fps; int fpsaved = 0; /* We need to reverse the order of the registers. Apparently AIX stores the highest-numbered ones first. */ struct env387 fps_fixed; int i; if (inferior_pid) { char buf[10]; unsigned short status; ptrace (PT_READ_FPR, inferior_pid, buf, offsetof(struct env387, status)); memcpy (&status, buf, sizeof (status)); fpsaved = status; } else { if ((fpsaved = core_env387.status) != 0) memcpy(&fps, &core_env387, sizeof(fps)); } if (fpsaved == 0) { printf_unfiltered ("no floating point status saved\n"); return; } if (inferior_pid) { int offset; for (offset = 0; offset < sizeof(fps); offset += 10) { char buf[10]; ptrace (PT_READ_FPR, inferior_pid, buf, offset); memcpy ((char *)&fps.control + offset, buf, MIN(10, sizeof(fps) - offset)); } } fps_fixed = fps; for (i = 0; i < 8; ++i) memcpy (fps_fixed.regs[i], fps.regs[7 - i], 10); print_387_status (0, &fps_fixed); } /* Fetch one register. */ static void fetch_register (regno) int regno; { char buf[MAX_REGISTER_RAW_SIZE]; if (regno < FP0_REGNUM) *(int *)buf = ptrace (PT_READ_GPR, inferior_pid, PT_REG(regmap[regno]), 0, 0); else ptrace (PT_READ_FPR, inferior_pid, buf, (regno - FP0_REGNUM)*10 + offsetof(struct env387, regs)); supply_register (regno, buf); } void fetch_inferior_registers (regno) int regno; { if (regno < 0) for (regno = 0; regno < NUM_REGS; regno++) fetch_register (regno); else fetch_register (regno); } /* store one register */ static void store_register (regno) int regno; { char buf[80]; extern char registers[]; errno = 0; if (regno < FP0_REGNUM) ptrace (PT_WRITE_GPR, inferior_pid, PT_REG(regmap[regno]), *(int *) ®isters[REGISTER_BYTE (regno)], 0); else ptrace (PT_WRITE_FPR, inferior_pid, ®isters[REGISTER_BYTE (regno)], (regno - FP0_REGNUM)*10 + offsetof(struct env387, regs)); if (errno != 0) { sprintf (buf, "writing register number %d", regno); perror_with_name (buf); } } /* Store our register values back into the inferior. If REGNO is -1, do this for all registers. Otherwise, REGNO specifies which register (so we can save time). */ void store_inferior_registers (regno) int regno; { if (regno < 0) for (regno = 0; regno < NUM_REGS; regno++) store_register (regno); else store_register (regno); } #ifndef CD_AX /* defined in sys/i386/coredump.h */ # define CD_AX 0 # define CD_BX 1 # define CD_CX 2 # define CD_DX 3 # define CD_SI 4 # define CD_DI 5 # define CD_BP 6 # define CD_SP 7 # define CD_FL 8 # define CD_IP 9 # define CD_CS 10 # define CD_DS 11 # define CD_ES 12 # define CD_FS 13 # define CD_GS 14 # define CD_SS 15 #endif /* * The order here in core_regmap[] has to be the same as in * regmap[] above. */ static int core_regmap[] = { CD_AX, CD_CX, CD_DX, CD_BX, CD_SP, CD_BP, CD_SI, CD_DI, CD_IP, CD_FL, CD_CS, CD_SS, CD_DS, CD_ES, CD_FS, CD_GS, }; static void fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr) char *core_reg_sect; unsigned core_reg_size; int which; CORE_ADDR reg_addr; /* ignored */ { if (which == 0) { /* Integer registers */ #define cd_regs(n) ((int *)core_reg_sect)[n] #define regs(n) *((int *) ®isters[REGISTER_BYTE (n)]) int i; for (i = 0; i < FP0_REGNUM; i++) regs(i) = cd_regs(core_regmap[i]); } else if (which == 2) { /* Floating point registers */ if (core_reg_size >= sizeof (core_env387)) memcpy (&core_env387, core_reg_sect, core_reg_size); else fprintf_unfiltered (gdb_stderr, "Couldn't read float regs from core file\n"); } } /* Register that we are able to handle i386aix core file formats. FIXME: is this really bfd_target_unknown_flavour? */ static struct core_fns i386aix_core_fns = { bfd_target_unknown_flavour, fetch_core_registers, NULL }; void _initialize_core_i386aix () { add_core_fns (&i386aix_core_fns); }