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Diffstat (limited to 'gdb/gdbserver/low-sparc.c')
| -rw-r--r-- | gdb/gdbserver/low-sparc.c | 334 |
1 files changed, 334 insertions, 0 deletions
diff --git a/gdb/gdbserver/low-sparc.c b/gdb/gdbserver/low-sparc.c new file mode 100644 index 00000000000..ddffaec5927 --- /dev/null +++ b/gdb/gdbserver/low-sparc.c @@ -0,0 +1,334 @@ +/* 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 "defs.h" +#include <sys/wait.h> +#include "frame.h" +#include "inferior.h" +/*************************** +#include "initialize.h" +****************************/ + +#include <stdio.h> +#include <sys/param.h> +#include <sys/dir.h> +#include <sys/user.h> +#include <signal.h> +#include <sys/ioctl.h> +#include <sgtty.h> +#include <fcntl.h> + +/***************Begin MY defs*********************/ +int quit_flag = 0; +char registers[REGISTER_BYTES]; + +/* Index within `registers' of the first byte of the space for + register N. */ + + +char buf2[MAX_REGISTER_RAW_SIZE]; +/***************End MY defs*********************/ + +#include <sys/ptrace.h> +#include <sys/reg.h> + +extern int sys_nerr; +extern char **sys_errlist; +extern char **environ; +extern int errno; +extern int inferior_pid; +void quit (), perror_with_name (); +int query (); + +/* Start an inferior process and returns its pid. + ALLARGS is a vector of program-name and args. + ENV is the environment vector to pass. */ + +int +create_inferior (program, allargs) + char *program; + char **allargs; +{ + int pid; + + pid = fork (); + if (pid < 0) + perror_with_name ("fork"); + + if (pid == 0) + { + ptrace (PTRACE_TRACEME); + + execv (program, allargs); + + fprintf (stderr, "Cannot exec %s: %s.\n", 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 (8, inferior_pid, 0, 0); + wait (0); + /*************inferior_died ();****VK**************/ +} + +/* Return nonzero if the given thread is still alive. */ +int +mythread_alive (pid) + int pid; +{ + return 1; +} + +/* Wait for process, returns status */ + +unsigned char +mywait (status) + char *status; +{ + int pid; + union wait w; + + pid = wait (&w); + if (pid != inferior_pid) + perror_with_name ("wait"); + + if (WIFEXITED (w)) + { + fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w)); + *status = 'W'; + return ((unsigned char) WEXITSTATUS (w)); + } + else if (!WIFSTOPPED (w)) + { + fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (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 : PTRACE_CONT, inferior_pid, 1, signal); + if (errno) + perror_with_name ("ptrace"); +} + +/* 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; +{ + struct regs inferior_registers; + struct fp_status inferior_fp_registers; + int i; + + /* Global and Out regs are fetched directly, as well as the control + registers. If we're getting one of the in or local regs, + and the stack pointer has not yet been fetched, + we have to do that first, since they're found in memory relative + to the stack pointer. */ + + if (ptrace (PTRACE_GETREGS, inferior_pid, + (PTRACE_ARG3_TYPE) &inferior_registers, 0)) + perror("ptrace_getregs"); + + registers[REGISTER_BYTE (0)] = 0; + memcpy (®isters[REGISTER_BYTE (1)], &inferior_registers.r_g1, + 15 * REGISTER_RAW_SIZE (G0_REGNUM)); + *(int *)®isters[REGISTER_BYTE (PS_REGNUM)] = inferior_registers.r_ps; + *(int *)®isters[REGISTER_BYTE (PC_REGNUM)] = inferior_registers.r_pc; + *(int *)®isters[REGISTER_BYTE (NPC_REGNUM)] = inferior_registers.r_npc; + *(int *)®isters[REGISTER_BYTE (Y_REGNUM)] = inferior_registers.r_y; + + /* Floating point registers */ + + if (ptrace (PTRACE_GETFPREGS, inferior_pid, + (PTRACE_ARG3_TYPE) &inferior_fp_registers, + 0)) + perror("ptrace_getfpregs"); + memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)], &inferior_fp_registers, + sizeof inferior_fp_registers.fpu_fr); + + /* These regs are saved on the stack by the kernel. Only read them + all (16 ptrace calls!) if we really need them. */ + + read_inferior_memory (*(CORE_ADDR*)®isters[REGISTER_BYTE (SP_REGNUM)], + ®isters[REGISTER_BYTE (L0_REGNUM)], + 16*REGISTER_RAW_SIZE (L0_REGNUM)); +} + +/* 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; +{ + struct regs inferior_registers; + struct fp_status inferior_fp_registers; + CORE_ADDR sp = *(CORE_ADDR *)®isters[REGISTER_BYTE (SP_REGNUM)]; + + write_inferior_memory (sp, ®isters[REGISTER_BYTE (L0_REGNUM)], + 16*REGISTER_RAW_SIZE (L0_REGNUM)); + + memcpy (&inferior_registers.r_g1, ®isters[REGISTER_BYTE (G1_REGNUM)], + 15 * REGISTER_RAW_SIZE (G1_REGNUM)); + + inferior_registers.r_ps = + *(int *)®isters[REGISTER_BYTE (PS_REGNUM)]; + inferior_registers.r_pc = + *(int *)®isters[REGISTER_BYTE (PC_REGNUM)]; + inferior_registers.r_npc = + *(int *)®isters[REGISTER_BYTE (NPC_REGNUM)]; + inferior_registers.r_y = + *(int *)®isters[REGISTER_BYTE (Y_REGNUM)]; + + if (ptrace (PTRACE_SETREGS, inferior_pid, + (PTRACE_ARG3_TYPE) &inferior_registers, 0)) + perror("ptrace_setregs"); + + memcpy (&inferior_fp_registers, ®isters[REGISTER_BYTE (FP0_REGNUM)], + sizeof inferior_fp_registers.fpu_fr); + + if (ptrace (PTRACE_SETFPREGS, inferior_pid, + (PTRACE_ARG3_TYPE) &inferior_fp_registers, 0)) + perror("ptrace_setfpregs"); +} + +/* 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. */ + +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 (1, inferior_pid, 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 (1, inferior_pid, addr, 0); + + if (count > 1) + { + buffer[count - 1] + = ptrace (1, 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)) + { + errno = 0; + ptrace (4, inferior_pid, addr, buffer[i]); + if (errno) + return errno; + } + + return 0; +} + +void +initialize () +{ + inferior_pid = 0; +} + +int +have_inferior_p () +{ + return inferior_pid != 0; +} |