diff options
Diffstat (limited to 'gdb/gdbserver/low-lynx.c')
| -rw-r--r-- | gdb/gdbserver/low-lynx.c | 746 |
1 files changed, 746 insertions, 0 deletions
diff --git a/gdb/gdbserver/low-lynx.c b/gdb/gdbserver/low-lynx.c new file mode 100644 index 0000000..3444f7a --- /dev/null +++ b/gdb/gdbserver/low-lynx.c @@ -0,0 +1,746 @@ +/* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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> +#ifndef __LYNXOS +#define __LYNXOS +#endif +#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 <sys/wait.h> +#include <sys/fpp.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, 0, (PTRACE_ARG3_TYPE)0, 0); + + 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; +} + +/* Return nonzero if the given thread is still alive. */ +int +mythread_alive (pid) + int pid; +{ + /* Arggh. Apparently pthread_kill only works for threads within + the process that calls pthread_kill. + + We want to avoid the lynx signal extensions as they simply don't + map well to the generic gdb interface we want to keep. + + All we want to do is determine if a particular thread is alive; + it appears as if we can just make a harmless thread specific + ptrace call to do that. */ + return (ptrace (PTRACE_THREADUSER, + BUILDPID (PIDGET (inferior_pid), pid), 0, 0) != -1); +} + +/* Wait for process, returns status */ + +unsigned char +mywait (status) + char *status; +{ + int pid; + union wait w; + + while (1) + { + enable_async_io(); + + pid = wait (&w); + + disable_async_io(); + + if (pid != PIDGET(inferior_pid)) + perror_with_name ("wait"); + + thread_from_wait = w.w_tid; + inferior_pid = BUILDPID (inferior_pid, w.w_tid); + + if (WIFSTOPPED(w) + && WSTOPSIG(w) == SIGTRAP) + { + int realsig; + + realsig = ptrace (PTRACE_GETTRACESIG, inferior_pid, + (PTRACE_ARG3_TYPE)0, 0); + + if (realsig == SIGNEWTHREAD) + { + /* It's a new thread notification. Nothing to do here since + the machine independent code in wait_for_inferior will + add the thread to the thread list and restart the thread + when pid != inferior_pid and pid is not in the thread list. + We don't even want to muck with realsig -- the code in + wait_for_inferior expects SIGTRAP. */ + ; + } + } + break; + } + + if (WIFEXITED (w)) + { + *status = 'W'; + return ((unsigned char) WEXITSTATUS (w)); + } + else if (!WIFSTOPPED (w)) + { + *status = 'X'; + return ((unsigned char) WTERMSIG (w)); + } + + fetch_inferior_registers (0); + + *status = 'T'; + 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_ONE : PTRACE_CONT, + BUILDPID (inferior_pid, cont_thread == -1 ? 0 : cont_thread), + 1, signal); + if (errno) + perror_with_name ("ptrace"); +} + +#undef offsetof +#define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER) + +/* Mapping between GDB register #s and offsets into econtext. Must be + consistent with REGISTER_NAMES macro in various tmXXX.h files. */ + +#define X(ENTRY)(offsetof(struct econtext, ENTRY)) + +#ifdef I386 +/* Mappings from tm-i386v.h */ + +static int regmap[] = +{ + X(eax), + X(ecx), + X(edx), + X(ebx), + X(esp), /* sp */ + X(ebp), /* fp */ + X(esi), + X(edi), + X(eip), /* pc */ + 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. */ +}; +#endif + +#ifdef M68K +/* Mappings from tm-m68k.h */ + +static int regmap[] = +{ + X(regs[0]), /* d0 */ + X(regs[1]), /* d1 */ + X(regs[2]), /* d2 */ + X(regs[3]), /* d3 */ + X(regs[4]), /* d4 */ + X(regs[5]), /* d5 */ + X(regs[6]), /* d6 */ + X(regs[7]), /* d7 */ + X(regs[8]), /* a0 */ + X(regs[9]), /* a1 */ + X(regs[10]), /* a2 */ + X(regs[11]), /* a3 */ + X(regs[12]), /* a4 */ + X(regs[13]), /* a5 */ + X(regs[14]), /* fp */ + 0, /* sp */ + X(status), /* ps */ + X(pc), + + X(fregs[0*3]), /* fp0 */ + X(fregs[1*3]), /* fp1 */ + X(fregs[2*3]), /* fp2 */ + X(fregs[3*3]), /* fp3 */ + X(fregs[4*3]), /* fp4 */ + X(fregs[5*3]), /* fp5 */ + X(fregs[6*3]), /* fp6 */ + X(fregs[7*3]), /* fp7 */ + + X(fcregs[0]), /* fpcontrol */ + X(fcregs[1]), /* fpstatus */ + X(fcregs[2]), /* fpiaddr */ + X(ssw), /* fpcode */ + X(fault), /* fpflags */ +}; +#endif + +#ifdef SPARC +/* Mappings from tm-sparc.h */ + +#define FX(ENTRY)(offsetof(struct fcontext, ENTRY)) + +static int regmap[] = +{ + -1, /* g0 */ + X(g1), + X(g2), + X(g3), + X(g4), + -1, /* g5->g7 aren't saved by Lynx */ + -1, + -1, + + X(o[0]), + X(o[1]), + X(o[2]), + X(o[3]), + X(o[4]), + X(o[5]), + X(o[6]), /* sp */ + X(o[7]), /* ra */ + + -1,-1,-1,-1,-1,-1,-1,-1, /* l0 -> l7 */ + + -1,-1,-1,-1,-1,-1,-1,-1, /* i0 -> i7 */ + + FX(f.fregs[0]), /* f0 */ + FX(f.fregs[1]), + FX(f.fregs[2]), + FX(f.fregs[3]), + FX(f.fregs[4]), + FX(f.fregs[5]), + FX(f.fregs[6]), + FX(f.fregs[7]), + FX(f.fregs[8]), + FX(f.fregs[9]), + FX(f.fregs[10]), + FX(f.fregs[11]), + FX(f.fregs[12]), + FX(f.fregs[13]), + FX(f.fregs[14]), + FX(f.fregs[15]), + FX(f.fregs[16]), + FX(f.fregs[17]), + FX(f.fregs[18]), + FX(f.fregs[19]), + FX(f.fregs[20]), + FX(f.fregs[21]), + FX(f.fregs[22]), + FX(f.fregs[23]), + FX(f.fregs[24]), + FX(f.fregs[25]), + FX(f.fregs[26]), + FX(f.fregs[27]), + FX(f.fregs[28]), + FX(f.fregs[29]), + FX(f.fregs[30]), + FX(f.fregs[31]), + + X(y), + X(psr), + X(wim), + X(tbr), + X(pc), + X(npc), + FX(fsr), /* fpsr */ + -1, /* cpsr */ +}; +#endif + +#ifdef SPARC + +/* This routine handles some oddball cases for Sparc registers and LynxOS. + In partucular, it causes refs to G0, g5->7, and all fp regs to return zero. + It also handles knows where to find the I & L regs on the stack. */ + +void +fetch_inferior_registers (regno) + int regno; +{ +#if 0 + int whatregs = 0; + +#define WHATREGS_FLOAT 1 +#define WHATREGS_GEN 2 +#define WHATREGS_STACK 4 + + if (regno == -1) + whatregs = WHATREGS_FLOAT | WHATREGS_GEN | WHATREGS_STACK; + else if (regno >= L0_REGNUM && regno <= I7_REGNUM) + whatregs = WHATREGS_STACK; + else if (regno >= FP0_REGNUM && regno < FP0_REGNUM + 32) + whatregs = WHATREGS_FLOAT; + else + whatregs = WHATREGS_GEN; + + if (whatregs & WHATREGS_GEN) + { + struct econtext ec; /* general regs */ + char buf[MAX_REGISTER_RAW_SIZE]; + int retval; + int i; + + errno = 0; + retval = ptrace (PTRACE_GETREGS, + BUILDPID (inferior_pid, general_thread), + (PTRACE_ARG3_TYPE) &ec, + 0); + if (errno) + perror_with_name ("Sparc fetch_inferior_registers(ptrace)"); + + memset (buf, 0, REGISTER_RAW_SIZE (G0_REGNUM)); + supply_register (G0_REGNUM, buf); + supply_register (TBR_REGNUM, (char *)&ec.tbr); + + memcpy (®isters[REGISTER_BYTE (G1_REGNUM)], &ec.g1, + 4 * REGISTER_RAW_SIZE (G1_REGNUM)); + for (i = G1_REGNUM; i <= G1_REGNUM + 3; i++) + register_valid[i] = 1; + + supply_register (PS_REGNUM, (char *)&ec.psr); + supply_register (Y_REGNUM, (char *)&ec.y); + supply_register (PC_REGNUM, (char *)&ec.pc); + supply_register (NPC_REGNUM, (char *)&ec.npc); + supply_register (WIM_REGNUM, (char *)&ec.wim); + + memcpy (®isters[REGISTER_BYTE (O0_REGNUM)], ec.o, + 8 * REGISTER_RAW_SIZE (O0_REGNUM)); + for (i = O0_REGNUM; i <= O0_REGNUM + 7; i++) + register_valid[i] = 1; + } + + if (whatregs & WHATREGS_STACK) + { + CORE_ADDR sp; + int i; + + sp = read_register (SP_REGNUM); + + target_xfer_memory (sp + FRAME_SAVED_I0, + ®isters[REGISTER_BYTE(I0_REGNUM)], + 8 * REGISTER_RAW_SIZE (I0_REGNUM), 0); + for (i = I0_REGNUM; i <= I7_REGNUM; i++) + register_valid[i] = 1; + + target_xfer_memory (sp + FRAME_SAVED_L0, + ®isters[REGISTER_BYTE(L0_REGNUM)], + 8 * REGISTER_RAW_SIZE (L0_REGNUM), 0); + for (i = L0_REGNUM; i <= L0_REGNUM + 7; i++) + register_valid[i] = 1; + } + + if (whatregs & WHATREGS_FLOAT) + { + struct fcontext fc; /* fp regs */ + int retval; + int i; + + errno = 0; + retval = ptrace (PTRACE_GETFPREGS, BUILDPID (inferior_pid, general_thread), (PTRACE_ARG3_TYPE) &fc, + 0); + if (errno) + perror_with_name ("Sparc fetch_inferior_registers(ptrace)"); + + memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)], fc.f.fregs, + 32 * REGISTER_RAW_SIZE (FP0_REGNUM)); + for (i = FP0_REGNUM; i <= FP0_REGNUM + 31; i++) + register_valid[i] = 1; + + supply_register (FPS_REGNUM, (char *)&fc.fsr); + } +#endif +} + +/* This routine handles storing of the I & L regs for the Sparc. The trick + here is that they actually live on the stack. The really tricky part is + that when changing the stack pointer, the I & L regs must be written to + where the new SP points, otherwise the regs will be incorrect when the + process is started up again. We assume that the I & L regs are valid at + this point. */ + +void +store_inferior_registers (regno) + int regno; +{ +#if 0 + int whatregs = 0; + + if (regno == -1) + whatregs = WHATREGS_FLOAT | WHATREGS_GEN | WHATREGS_STACK; + else if (regno >= L0_REGNUM && regno <= I7_REGNUM) + whatregs = WHATREGS_STACK; + else if (regno >= FP0_REGNUM && regno < FP0_REGNUM + 32) + whatregs = WHATREGS_FLOAT; + else if (regno == SP_REGNUM) + whatregs = WHATREGS_STACK | WHATREGS_GEN; + else + whatregs = WHATREGS_GEN; + + if (whatregs & WHATREGS_GEN) + { + struct econtext ec; /* general regs */ + int retval; + + ec.tbr = read_register (TBR_REGNUM); + memcpy (&ec.g1, ®isters[REGISTER_BYTE (G1_REGNUM)], + 4 * REGISTER_RAW_SIZE (G1_REGNUM)); + + ec.psr = read_register (PS_REGNUM); + ec.y = read_register (Y_REGNUM); + ec.pc = read_register (PC_REGNUM); + ec.npc = read_register (NPC_REGNUM); + ec.wim = read_register (WIM_REGNUM); + + memcpy (ec.o, ®isters[REGISTER_BYTE (O0_REGNUM)], + 8 * REGISTER_RAW_SIZE (O0_REGNUM)); + + errno = 0; + retval = ptrace (PTRACE_SETREGS, BUILDPID (inferior_pid, general_thread), (PTRACE_ARG3_TYPE) &ec, + 0); + if (errno) + perror_with_name ("Sparc fetch_inferior_registers(ptrace)"); + } + + if (whatregs & WHATREGS_STACK) + { + int regoffset; + CORE_ADDR sp; + + sp = read_register (SP_REGNUM); + + if (regno == -1 || regno == SP_REGNUM) + { + if (!register_valid[L0_REGNUM+5]) + abort(); + target_xfer_memory (sp + FRAME_SAVED_I0, + ®isters[REGISTER_BYTE (I0_REGNUM)], + 8 * REGISTER_RAW_SIZE (I0_REGNUM), 1); + + target_xfer_memory (sp + FRAME_SAVED_L0, + ®isters[REGISTER_BYTE (L0_REGNUM)], + 8 * REGISTER_RAW_SIZE (L0_REGNUM), 1); + } + else if (regno >= L0_REGNUM && regno <= I7_REGNUM) + { + if (!register_valid[regno]) + abort(); + if (regno >= L0_REGNUM && regno <= L0_REGNUM + 7) + regoffset = REGISTER_BYTE (regno) - REGISTER_BYTE (L0_REGNUM) + + FRAME_SAVED_L0; + else + regoffset = REGISTER_BYTE (regno) - REGISTER_BYTE (I0_REGNUM) + + FRAME_SAVED_I0; + target_xfer_memory (sp + regoffset, ®isters[REGISTER_BYTE (regno)], + REGISTER_RAW_SIZE (regno), 1); + } + } + + if (whatregs & WHATREGS_FLOAT) + { + struct fcontext fc; /* fp regs */ + int retval; + +/* We read fcontext first so that we can get good values for fq_t... */ + errno = 0; + retval = ptrace (PTRACE_GETFPREGS, BUILDPID (inferior_pid, general_thread), (PTRACE_ARG3_TYPE) &fc, + 0); + if (errno) + perror_with_name ("Sparc fetch_inferior_registers(ptrace)"); + + memcpy (fc.f.fregs, ®isters[REGISTER_BYTE (FP0_REGNUM)], + 32 * REGISTER_RAW_SIZE (FP0_REGNUM)); + + fc.fsr = read_register (FPS_REGNUM); + + errno = 0; + retval = ptrace (PTRACE_SETFPREGS, BUILDPID (inferior_pid, general_thread), (PTRACE_ARG3_TYPE) &fc, + 0); + if (errno) + perror_with_name ("Sparc fetch_inferior_registers(ptrace)"); + } +#endif +} +#endif /* SPARC */ + +#ifndef SPARC + +/* Return the offset relative to the start of the per-thread data to the + saved context block. */ + +static unsigned long +lynx_registers_addr() +{ + CORE_ADDR stblock; + int ecpoff = offsetof(st_t, ecp); + CORE_ADDR ecp; + + errno = 0; + stblock = (CORE_ADDR) ptrace (PTRACE_THREADUSER, BUILDPID (inferior_pid, general_thread), + (PTRACE_ARG3_TYPE)0, 0); + if (errno) + perror_with_name ("PTRACE_THREADUSER"); + + ecp = (CORE_ADDR) ptrace (PTRACE_PEEKTHREAD, BUILDPID (inferior_pid, general_thread), + (PTRACE_ARG3_TYPE)ecpoff, 0); + if (errno) + perror_with_name ("lynx_registers_addr(PTRACE_PEEKTHREAD)"); + + return ecp - stblock; +} + +/* 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; + unsigned long ecp; + + ecp = lynx_registers_addr(); + + for (regno = 0; regno < NUM_REGS; regno++) + { + int ptrace_fun = PTRACE_PEEKTHREAD; + +#ifdef PTRACE_PEEKUSP + ptrace_fun = regno == SP_REGNUM ? PTRACE_PEEKUSP : PTRACE_PEEKTHREAD; +#endif + + errno = 0; + reg = ptrace (ptrace_fun, BUILDPID (inferior_pid, general_thread), + (PTRACE_ARG3_TYPE) (ecp + 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; + unsigned long ecp; + + ecp = lynx_registers_addr(); + + for (regno = 0; regno < NUM_REGS; regno++) + { + int ptrace_fun = PTRACE_POKEUSER; + +#ifdef PTRACE_POKEUSP + ptrace_fun = regno == SP_REGNUM ? PTRACE_POKEUSP : PTRACE_POKEUSER; +#endif + + reg = *(unsigned long *)®isters[REGISTER_BYTE (regno)]; + + errno = 0; + ptrace (ptrace_fun, BUILDPID (inferior_pid, general_thread), + (PTRACE_ARG3_TYPE) (ecp + regmap[regno]), reg); + if (errno) + perror_with_name ("PTRACE_POKEUSER"); + } +} + +#endif /* ! SPARC */ + +/* 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, BUILDPID (inferior_pid, general_thread), addr, 0); + } + + /* Copy appropriate bytes out of the buffer. */ + memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), 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, BUILDPID (inferior_pid, general_thread), addr, 0); + + if (count > 1) + { + buffer[count - 1] + = ptrace (PTRACE_PEEKTEXT, BUILDPID (inferior_pid, general_thread), + addr + (count - 1) * sizeof (int), 0); + } + + /* Copy data to be written over corresponding part of buffer */ + + memcpy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len); + + /* Write the entire buffer. */ + + for (i = 0; i < count; i++, addr += sizeof (int)) + { + while (1) + { + errno = 0; + ptrace (PTRACE_POKETEXT, BUILDPID (inferior_pid, general_thread), addr, buffer[i]); + if (errno) + { + fprintf(stderr, "\ +ptrace (PTRACE_POKETEXT): errno=%d, pid=0x%x, addr=0x%x, buffer[i] = 0x%x\n", + errno, BUILDPID (inferior_pid, general_thread), + addr, buffer[i]); + fprintf(stderr, "Sleeping for 1 second\n"); + sleep(1); + } + else + break; + } + } + + return 0; +} |