| /* 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; |
| |
| #ifdef HAVE_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]; |
| 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, /* core_flavour */ |
| default_check_format, /* check_format */ |
| default_core_sniffer, /* core_sniffer */ |
| fetch_core_registers, /* core_read_registers */ |
| NULL /* next */ |
| }; |
| |
| void |
| _initialize_core_i386aix () |
| { |
| add_core_fns (&i386aix_core_fns); |
| } |