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author | Jim Kingdon <jkingdon@engr.sgi.com> | 1993-08-27 16:59:46 +0000 |
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committer | Jim Kingdon <jkingdon@engr.sgi.com> | 1993-08-27 16:59:46 +0000 |
commit | c033ec179a2ab0513691c18d30ec80c8b4885916 (patch) | |
tree | aece5a4026a9ec94317c84187c7acdacf8cd0e15 /gdb/gdbserver/low-lynx.c | |
parent | a5ba0d3f4818c0ad3e1d5b002d07783ae668e3e5 (diff) | |
download | fsf-binutils-gdb-c033ec179a2ab0513691c18d30ec80c8b4885916.zip fsf-binutils-gdb-c033ec179a2ab0513691c18d30ec80c8b4885916.tar.gz fsf-binutils-gdb-c033ec179a2ab0513691c18d30ec80c8b4885916.tar.bz2 |
* Rename files for 14-character limits:
gdbserver/remote-gutils.c -> gdbserver/utils.c
gdbserver/remote-inflow.c -> gdbserver/low-lynx.c
gdbserver/remote-inflow-sparc.c -> gdbserver/low-sparc.c
gdbserver/remote-server.c -> gdbserver/server.c
remote-monitor.c -> remote-mon.c
* Makefile.in, gdbserver/Makefile.in, config/m68k/monitor.mt:
Change accordingly.
* gdbserver/Makefile.in: Remove more junk inherited from gdb Makefile.
Diffstat (limited to 'gdb/gdbserver/low-lynx.c')
-rw-r--r-- | gdb/gdbserver/low-lynx.c | 345 |
1 files changed, 345 insertions, 0 deletions
diff --git a/gdb/gdbserver/low-lynx.c b/gdb/gdbserver/low-lynx.c new file mode 100644 index 0000000..44070c5 --- /dev/null +++ b/gdb/gdbserver/low-lynx.c @@ -0,0 +1,345 @@ +/* Low level interface to ptrace, for the remote server for GDB. + Copyright (C) 1986, 1987, 1993 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. */ + +#include "server.h" +#include "frame.h" +#include "inferior.h" + +#include <stdio.h> +#include <sys/param.h> +#include <sys/dir.h> +#define LYNXOS +#include <sys/mem.h> +#include <sys/signal.h> +#include <sys/file.h> +#include <sys/kernel.h> +#include <sys/itimer.h> +#include <sys/time.h> +#include <sys/resource.h> +#include <sys/proc.h> +#include <signal.h> +#include <sys/ioctl.h> +#include <sgtty.h> +#include <fcntl.h> +#include "/usr/include/wait.h" + +char registers[REGISTER_BYTES]; + +#include <sys/ptrace.h> + +/* Start an inferior process and returns its pid. + ALLARGS is a vector of program-name and args. */ + +int +create_inferior (program, allargs) + char *program; + char **allargs; +{ + int pid; + + pid = fork (); + if (pid < 0) + perror_with_name ("fork"); + + if (pid == 0) + { + int pgrp; + + /* Switch child to it's own process group so that signals won't + directly affect gdbserver. */ + + pgrp = getpid(); + setpgrp(0, pgrp); + ioctl (0, TIOCSPGRP, &pgrp); + + ptrace (PTRACE_TRACEME); + + execv (program, allargs); + + fprintf (stderr, "GDBserver (process %d): Cannot exec %s: %s.\n", + getpid(), program, + errno < sys_nerr ? sys_errlist[errno] : "unknown error"); + fflush (stderr); + _exit (0177); + } + + return pid; +} + +/* Kill the inferior process. Make us have no inferior. */ + +void +kill_inferior () +{ + if (inferior_pid == 0) + return; + ptrace (PTRACE_KILL, inferior_pid, 0, 0); + wait (0); + + inferior_pid = 0; +} + +/* Wait for process, returns status */ + +unsigned char +mywait (status) + char *status; +{ + int pid; + union wait w; + + enable_async_io(); + + pid = wait (&w); + + disable_async_io(); + + if (pid != PIDGET(inferior_pid)) + perror_with_name ("wait"); + + inferior_pid = BUILDPID (inferior_pid, w.w_tid); + + if (WIFEXITED (w)) + { + fprintf (stderr, "\nChild exited with status %d\n", WEXITSTATUS (w)); + fprintf (stderr, "GDBserver exiting\n"); + exit (0); + } + else if (!WIFSTOPPED (w)) + { + fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w)); + *status = 'T'; + return ((unsigned char) WTERMSIG (w)); + } + + fetch_inferior_registers (0); + + *status = 'S'; + return ((unsigned char) WSTOPSIG (w)); +} + +/* Resume execution of the inferior process. + If STEP is nonzero, single-step it. + If SIGNAL is nonzero, give it that signal. */ + +void +myresume (step, signal) + int step; + int signal; +{ + errno = 0; + ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, inferior_pid, 1, signal); + if (errno) + perror_with_name ("ptrace"); +} + +#undef offsetof +#define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER) + +static struct econtext * +lynx_registers_addr() +{ + st_t *stblock; + int ecpoff = offsetof(st_t, ecp); + CORE_ADDR ecp; + + errno = 0; + stblock = (st_t *) ptrace (PTRACE_THREADUSER, inferior_pid, + (PTRACE_ARG3_TYPE)0, 0); + if (errno) + perror_with_name ("PTRACE_THREADUSER"); + + ecp = (CORE_ADDR) ptrace (PTRACE_PEEKTHREAD, inferior_pid, + (PTRACE_ARG3_TYPE)ecpoff, 0); + ecp -= (CORE_ADDR)stblock; + if (errno) + perror_with_name ("lynx_registers_addr(PTRACE_PEEKTHREAD)"); + + return (struct econtext *)ecp; +} + +static struct econtext *ecp; + +/* Mapping between GDB register #s and offsets into econtext. Must be + consistent with REGISTER_NAMES macro in tm-i386v.h. */ + +#define X(ENTRY)(offsetof(struct econtext, ENTRY) / 4) +static int regmap[] = { + X(eax), + X(ecx), + X(edx), + X(ebx), + X(esp), + X(ebp), + X(esi), + X(edi), + X(eip), + X(flags), /* ps */ + X(cs), + X(ss), + X(ds), + X(es), + X(ecode), /* Lynx doesn't give us either fs or gs, so */ + X(fault) /* we just substitute these two in the hopes + that they are useful. */ + }; + +/* Fetch one or more registers from the inferior. REGNO == -1 to get + them all. We actually fetch more than requested, when convenient, + marking them as valid so we won't fetch them again. */ + +void +fetch_inferior_registers (ignored) + int ignored; +{ + int regno; + unsigned long reg; + struct econtext *ecp; + + ecp = lynx_registers_addr(); + + for (regno = 0; regno < NUM_REGS; regno++) + { + errno = 0; + reg = ptrace (PTRACE_PEEKTHREAD, inferior_pid, + (PTRACE_ARG3_TYPE) (&ecp->fault + regmap[regno]), 0); + if (errno) + perror_with_name ("fetch_inferior_registers(PTRACE_PEEKTHREAD)"); + + *(unsigned long *)®isters[REGISTER_BYTE (regno)] = reg; + } +} + +/* 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 (ignored) + int ignored; +{ + int regno; + unsigned long reg; + struct econtext *ecp; + + ecp = lynx_registers_addr(); + + for (regno = 0; regno < NUM_REGS; regno++) + { + reg = *(unsigned long *)®isters[REGISTER_BYTE (regno)]; + + errno = 0; + ptrace (PTRACE_POKEUSER, inferior_pid, + (PTRACE_ARG3_TYPE) (&ecp->fault + regmap[regno]), reg); + if (errno) + perror_with_name ("PTRACE_POKEUSER"); + } +} + +/* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory + in the NEW_SUN_PTRACE case. + It ought to be straightforward. But it appears that writing did + not write the data that I specified. I cannot understand where + it got the data that it actually did write. */ + +/* Copy LEN bytes from inferior's memory starting at MEMADDR + to debugger memory starting at MYADDR. */ + +void +read_inferior_memory (memaddr, myaddr, len) + CORE_ADDR memaddr; + char *myaddr; + int len; +{ + register int i; + /* Round starting address down to longword boundary. */ + register CORE_ADDR addr = memaddr & -sizeof (int); + /* Round ending address up; get number of longwords that makes. */ + register int count + = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); + /* Allocate buffer of that many longwords. */ + register int *buffer = (int *) alloca (count * sizeof (int)); + + /* Read all the longwords */ + for (i = 0; i < count; i++, addr += sizeof (int)) + { + buffer[i] = ptrace (PTRACE_PEEKTEXT, inferior_pid, addr, 0); + } + + /* Copy appropriate bytes out of the buffer. */ + bcopy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len); +} + +/* Copy LEN bytes of data from debugger memory at MYADDR + to inferior's memory at MEMADDR. + On failure (cannot write the inferior) + returns the value of errno. */ + +int +write_inferior_memory (memaddr, myaddr, len) + CORE_ADDR memaddr; + char *myaddr; + int len; +{ + register int i; + /* Round starting address down to longword boundary. */ + register CORE_ADDR addr = memaddr & -sizeof (int); + /* Round ending address up; get number of longwords that makes. */ + register int count + = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); + /* Allocate buffer of that many longwords. */ + register int *buffer = (int *) alloca (count * sizeof (int)); + extern int errno; + + /* Fill start and end extra bytes of buffer with existing memory data. */ + + buffer[0] = ptrace (PTRACE_PEEKTEXT, inferior_pid, addr, 0); + + if (count > 1) + { + buffer[count - 1] + = ptrace (PTRACE_PEEKTEXT, inferior_pid, + addr + (count - 1) * sizeof (int), 0); + } + + /* Copy data to be written over corresponding part of buffer */ + + bcopy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len); + + /* Write the entire buffer. */ + + for (i = 0; i < count; i++, addr += sizeof (int)) + { + while (1) + { + errno = 0; + ptrace (PTRACE_POKETEXT, inferior_pid, addr, buffer[i]); + if (errno) + { + fprintf(stderr, "ptrace (PTRACE_POKETEXT): errno=%d, inferior_pid=0x%x, addr=0x%x, buffer[i] = 0x%x\n", errno, inferior_pid, addr, buffer[i]); + fprintf(stderr, "Sleeping for 1 second\n"); + sleep(1); + } + else + break; + } + } + + return 0; +} |