304 lines
7.6 KiB
C
304 lines
7.6 KiB
C
/* Native-dependent code for Lynx running on i386's, for GDB.
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Copyright 1988, 1989, 1991, 1992, 1993
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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., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "defs.h"
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#include "frame.h"
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#include "inferior.h"
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#include "gdbcore.h"
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#include "target.h"
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#include <sys/ptrace.h>
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#include "/usr/include/sys/wait.h"
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/* these values indicate the offset of the named register in the econtext
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structure */
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#define EAX 10
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#define ECX 9
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#define EDX 8
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#define EBX 7
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#define ESP 16
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#define EBP 5
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#define ESI 4
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#define EDI 3
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#define EIP 13
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#define EFL 15
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#define CS 14
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#define SS 17
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#define DS 2
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#define ES 1
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/* Currently these are not being used. So set them to 0 */
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#define FS 0
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#define GS 0
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/* this table must line up with REGISTER_NAMES in m-i386.h */
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static unsigned int regmap[] =
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{
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EAX, ECX, EDX, EBX,
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ESP, EBP, ESI, EDI,
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EIP, EFL, CS, SS,
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DS, ES, FS, GS,
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};
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/* Return the address in the core dump or inferior of register REGNO.
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BLOCKEND is the address of the econtext structure */
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static unsigned int
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register_addr (regno, blockend)
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int regno, blockend;
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{
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if (regno < 0 || regno >= NUM_REGS)
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error ("Invalid register number %d.", regno);
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return (blockend + regmap[regno] * sizeof (long));
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}
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/* Fetch one register. */
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static void
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fetch_register (regno, offset, bpid)
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int regno, bpid;
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unsigned int offset;
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{
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unsigned int regaddr;
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char buf[MAX_REGISTER_RAW_SIZE];
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char mess[128]; /* For messages */
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int i;
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regaddr = register_addr (regno, offset);
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for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
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{
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errno = 0;
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*(int *) &buf[i] = ptrace (PTRACE_PEEKTHREAD, bpid,
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(PTRACE_ARG3_TYPE) regaddr, 0);
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regaddr += sizeof (int);
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if (errno != 0)
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{
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sprintf (mess, "reading register %s (#%d)", reg_names[regno], regno);
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perror_with_name (mess);
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}
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}
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supply_register (regno, buf);
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}
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/* Store our register values back into the inferior.
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If REGNO is -1, do this for all registers.
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Otherwise, REGNO specifies which register (so we can save time). */
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static void
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store_register (regno, offset, bpid)
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int regno, bpid;
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unsigned int offset;
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{
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unsigned int regaddr;
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char mess[128];
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extern char registers[];
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int i;
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regaddr = register_addr (regno, offset);
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for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof(int))
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{
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errno = 0;
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ptrace (PTRACE_POKEUSER, bpid, (PTRACE_ARG3_TYPE) regaddr,
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*(int *) ®isters[REGISTER_BYTE (regno) + i]);
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if (errno != 0)
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{
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sprintf (mess, "writing register number %d(%d)", regno, i);
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perror_with_name (mess);
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}
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regaddr += sizeof(int);
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}
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}
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/* return an offset for use with register_addr() */
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static unsigned int
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fetch_offset (pid)
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int pid;
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{
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struct st_entry s;
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unsigned int specpage_off, offset = (char *) &s.ecp - (char *) &s;
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errno = 0;
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specpage_off = ptrace (PTRACE_THREADUSER, pid, (PTRACE_ARG3_TYPE) 0, 0);
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if (errno != 0)
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perror_with_name ("ptrace");
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errno = 0;
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offset = ptrace (PTRACE_PEEKTHREAD, pid, (PTRACE_ARG3_TYPE) offset, 0)
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- specpage_off;
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if (errno != 0)
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perror_with_name ("ptrace");
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return offset;
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}
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/* Fetch all registers, or just one, from the child process. */
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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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unsigned int offset = fetch_offset (inferior_pid);
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if (regno == -1)
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{
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for (regno = 0; regno < NUM_REGS; regno++)
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fetch_register (regno, offset, inferior_pid);
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}
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else
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fetch_register (regno, offset, inferior_pid);
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}
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/* Store all registers, or just one, to the child process. */
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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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unsigned int offset = fetch_offset (inferior_pid);
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if (regno == -1)
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{
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for (regno = 0; regno < NUM_REGS; regno++)
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store_register (regno, offset, inferior_pid);
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}
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else
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store_register (regno, offset, inferior_pid);
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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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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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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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unsigned reg_addr;
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{
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struct st_entry s;
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unsigned int regno, addr;
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for (regno = 0; regno < NUM_REGS; regno++)
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{
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addr = register_addr (regno, (char *) &s.ec - (char *) &s);
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supply_register (regno, core_reg_sect + addr);
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}
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}
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/* Wait for child to do something. Return pid of child, or -1 in case
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of error; store status through argument pointer STATUS. */
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int
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child_wait (status)
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int *status;
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{
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int pid;
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int save_errno;
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int thread;
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while (1)
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{
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int sig;
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if (attach_flag)
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set_sigint_trap(); /* Causes SIGINT to be passed on to the
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attached process. */
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pid = wait (status);
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save_errno = errno;
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if (attach_flag)
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clear_sigint_trap();
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if (pid == -1)
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{
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if (save_errno == EINTR)
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continue;
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fprintf (stderr, "Child process unexpectedly missing: %s.\n",
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safe_strerror (save_errno));
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*status = 42; /* Claim it exited with signal 42 */
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return -1;
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}
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if (pid != PIDGET (inferior_pid)) /* Some other process?!? */
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continue;
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/* thread = WIFTID (*status);*/
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thread = *status >> 16;
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/* Initial thread value can only be acquired via wait, so we have to
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resort to this hack. */
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if (TIDGET (inferior_pid) == 0)
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{
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inferior_pid = BUILDPID (inferior_pid, thread);
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add_thread (inferior_pid);
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}
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pid = BUILDPID (pid, thread);
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return pid;
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}
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}
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/* Return the PC of the caller from the call frame. Assumes the subr prologue
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has already been executed, and the frame pointer setup. If this is the
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outermost frame, we check to see if we are in a system call by examining the
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previous instruction. If so, then the return PC is actually at SP+4 because
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system calls use a different calling sequence. */
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CORE_ADDR
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i386lynx_saved_pc_after_call (frame)
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struct frame_info *frame;
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{
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char opcode[7];
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static const char call_inst[] = {0x9a, 0, 0, 0, 0, 8, 0}; /* lcall 0x8,0x0 */
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read_memory (frame->pc - 7, opcode, 7);
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if (memcmp (opcode, call_inst, 7) == 0)
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return read_memory_integer (read_register (SP_REGNUM) + 4, 4);
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return read_memory_integer (read_register (SP_REGNUM), 4);
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}
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/* Convert a Lynx process ID to a string. Returns the string in a static
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buffer. */
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char *
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i386lynx_pid_to_str (pid)
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int pid;
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{
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static char buf[40];
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sprintf (buf, "process %d thread %d", PIDGET (pid), TIDGET (pid));
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return buf;
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}
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