diff options
Diffstat (limited to 'gdb/gould-dep.c')
| -rw-r--r-- | gdb/gould-dep.c | 550 |
1 files changed, 550 insertions, 0 deletions
diff --git a/gdb/gould-dep.c b/gdb/gould-dep.c new file mode 100644 index 0000000..c078ec1 --- /dev/null +++ b/gdb/gould-dep.c @@ -0,0 +1,550 @@ +/* Low level interface to ptrace, for GDB when running under Unix. + Copyright (C) 1986, 1987 Free Software Foundation, Inc. + +GDB is distributed in the hope that it will be useful, but WITHOUT ANY +WARRANTY. No author or distributor accepts responsibility to anyone +for the consequences of using it or for whether it serves any +particular purpose or works at all, unless he says so in writing. +Refer to the GDB General Public License for full details. + +Everyone is granted permission to copy, modify and redistribute GDB, +but only under the conditions described in the GDB General Public +License. A copy of this license is supposed to have been given to you +along with GDB so you can know your rights and responsibilities. It +should be in a file named COPYING. Among other things, the copyright +notice and this notice must be preserved on all copies. + +In other words, go ahead and share GDB, but don't try to stop +anyone else from sharing it farther. Help stamp out software hoarding! +*/ + +#include "defs.h" +#include "param.h" +#include "frame.h" +#include "inferior.h" + +#include <stdio.h> +#include <sys/param.h> +#include <sys/dir.h> +#include <signal.h> +#include <sys/user.h> +#include <sys/ioctl.h> +#include <fcntl.h> + +#include <a.out.h> +#include <sys/file.h> +#include <sys/stat.h> + +extern int errno; + +/* This function simply calls ptrace with the given arguments. + It exists so that all calls to ptrace are isolated in this + machine-dependent file. */ +int +call_ptrace (request, pid, arg3, arg4) + int request, pid, arg3, arg4; +{ + return ptrace (request, pid, arg3, arg4); +} + +kill_inferior () +{ + if (remote_debugging) + return; + if (inferior_pid == 0) + return; + ptrace (8, inferior_pid, 0, 0); + wait (0); + inferior_died (); +} + +/* This is used when GDB is exiting. It gives less chance of error.*/ + +kill_inferior_fast () +{ + if (remote_debugging) + return; + if (inferior_pid == 0) + return; + ptrace (8, inferior_pid, 0, 0); + wait (0); +} + +/* Resume execution of the inferior process. + If STEP is nonzero, single-step it. + If SIGNAL is nonzero, give it that signal. */ + +void +resume (step, signal) + int step; + int signal; +{ + errno = 0; + if (remote_debugging) + remote_resume (step, signal); + else + { + ptrace (step ? 9 : 7, inferior_pid, 1, signal); + if (errno) + perror_with_name ("ptrace"); + } +} + +void +fetch_inferior_registers () +{ + register int regno; + register unsigned int regaddr; + char buf[MAX_REGISTER_RAW_SIZE]; + register int i; + + struct user u; + unsigned int offset = (char *) &u.u_ar0 - (char *) &u; + offset = ptrace (3, inferior_pid, offset, 0) - KERNEL_U_ADDR; + + for (regno = 0; regno < NUM_REGS; regno++) + { + regaddr = register_addr (regno, offset); + for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int)) + { + *(int *) &buf[i] = ptrace (3, inferior_pid, regaddr, 0); + regaddr += sizeof (int); + } + supply_register (regno, 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). */ + +store_inferior_registers (regno) + int regno; +{ + register unsigned int regaddr; + char buf[80]; + + struct user u; + unsigned int offset = (char *) &u.u_ar0 - (char *) &u; + offset = ptrace (3, inferior_pid, offset, 0) - KERNEL_U_ADDR; + + if (regno >= 0) + { + regaddr = register_addr (regno, offset); + errno = 0; + ptrace (6, inferior_pid, regaddr, read_register (regno)); + if (errno != 0) + { + sprintf (buf, "writing register number %d", regno); + perror_with_name (buf); + } + } + else for (regno = 0; regno < NUM_REGS; regno++) + { + regaddr = register_addr (regno, offset); + errno = 0; + ptrace (6, inferior_pid, regaddr, read_register (regno)); + if (errno != 0) + { + sprintf (buf, "writing register number %d", regno); + perror_with_name (buf); + } + } +} + +/* 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. + On failure (cannot read from inferior, usually because address is out + of bounds) returns the value of errno. */ + +int +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)); + extern int errno; + + /* Read all the longwords */ + for (i = 0; i < count; i++, addr += sizeof (int)) + { + errno = 0; + if (remote_debugging) + buffer[i] = remote_fetch_word (addr); + else + buffer[i] = ptrace (1, inferior_pid, addr, 0); + if (errno) + return errno; + } + + /* Copy appropriate bytes out of the buffer. */ + bcopy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len); + return 0; +} + +/* 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. */ + + if (remote_debugging) + buffer[0] = remote_fetch_word (addr); + else + buffer[0] = ptrace (1, inferior_pid, addr, 0); + + if (count > 1) + { + if (remote_debugging) + buffer[count - 1] + = remote_fetch_word (addr + (count - 1) * sizeof (int)); + else + 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; + if (remote_debugging) + remote_store_word (addr, buffer[i]); + else + ptrace (4, inferior_pid, addr, buffer[i]); + if (errno) + return errno; + } + + return 0; +} + +/* Work with core dump and executable files, for GDB. + This code would be in core.c if it weren't machine-dependent. */ + +/* Recognize COFF format systems because a.out.h defines AOUTHDR. */ +#ifdef AOUTHDR +#define COFF_FORMAT +#endif + +#ifndef N_TXTADDR +#define N_TXTADDR(hdr) 0 +#endif /* no N_TXTADDR */ + +#ifndef N_DATADDR +#define N_DATADDR(hdr) hdr.a_text +#endif /* no N_DATADDR */ + +/* Make COFF and non-COFF names for things a little more compatible + to reduce conditionals later. */ + +#ifdef COFF_FORMAT +#define a_magic magic +#endif + +#ifndef COFF_FORMAT +#define AOUTHDR struct exec +#endif + +extern char *sys_siglist[]; + + +/* Hook for `exec_file_command' command to call. */ + +extern void (*exec_file_display_hook) (); + +/* File names of core file and executable file. */ + +extern char *corefile; +extern char *execfile; + +/* Descriptors on which core file and executable file are open. + Note that the execchan is closed when an inferior is created + and reopened if the inferior dies or is killed. */ + +extern int corechan; +extern int execchan; + +/* Last modification time of executable file. + Also used in source.c to compare against mtime of a source file. */ + +extern int exec_mtime; + +/* Virtual addresses of bounds of the two areas of memory in the core file. */ + +extern CORE_ADDR data_start; +extern CORE_ADDR data_end; +extern CORE_ADDR stack_start; +extern CORE_ADDR stack_end; + +/* Virtual addresses of bounds of two areas of memory in the exec file. + Note that the data area in the exec file is used only when there is no core file. */ + +extern CORE_ADDR text_start; +extern CORE_ADDR text_end; + +extern CORE_ADDR exec_data_start; +extern CORE_ADDR exec_data_end; + +/* Address in executable file of start of text area data. */ + +extern int text_offset; + +/* Address in executable file of start of data area data. */ + +extern int exec_data_offset; + +/* Address in core file of start of data area data. */ + +extern int data_offset; + +/* Address in core file of start of stack area data. */ + +extern int stack_offset; + +#ifdef COFF_FORMAT +/* various coff data structures */ + +extern FILHDR file_hdr; +extern SCNHDR text_hdr; +extern SCNHDR data_hdr; + +#endif /* not COFF_FORMAT */ + +/* a.out header saved in core file. */ + +extern AOUTHDR core_aouthdr; + +/* a.out header of exec file. */ + +extern AOUTHDR exec_aouthdr; + +extern void validate_files (); + +core_file_command (filename, from_tty) + char *filename; + int from_tty; +{ + int val; + extern char registers[]; + + /* Discard all vestiges of any previous core file + and mark data and stack spaces as empty. */ + + if (corefile) + free (corefile); + corefile = 0; + + if (corechan >= 0) + close (corechan); + corechan = -1; + + data_start = 0; + data_end = 0; + stack_start = STACK_END_ADDR; + stack_end = STACK_END_ADDR; + + /* Now, if a new core file was specified, open it and digest it. */ + + if (filename) + { + if (have_inferior_p ()) + error ("To look at a core file, you must kill the inferior with \"kill\"."); + corechan = open (filename, O_RDONLY, 0); + if (corechan < 0) + perror_with_name (filename); + /* 4.2-style (and perhaps also sysV-style) core dump file. */ + { + struct user u; + int reg_offset; + + val = myread (corechan, &u, sizeof u); + if (val < 0) + perror_with_name (filename); + data_start = exec_data_start; + + data_end = data_start + NBPG * u.u_dsize; + stack_start = stack_end - NBPG * u.u_ssize; + data_offset = NBPG * UPAGES; + stack_offset = NBPG * (UPAGES + u.u_dsize); + reg_offset = (int) u.u_ar0 - KERNEL_U_ADDR; + + /* I don't know where to find this info. + So, for now, mark it as not available. */ + core_aouthdr.a_magic = 0; + + /* Read the register values out of the core file and store + them where `read_register' will find them. */ + + { + register int regno; + + for (regno = 0; regno < NUM_REGS; regno++) + { + char buf[MAX_REGISTER_RAW_SIZE]; + + val = lseek (corechan, register_addr (regno, reg_offset), 0); + if (val < 0) + perror_with_name (filename); + + val = myread (corechan, buf, sizeof buf); + if (val < 0) + perror_with_name (filename); + supply_register (regno, buf); + } + } + } + if (filename[0] == '/') + corefile = savestring (filename, strlen (filename)); + else + { + corefile = concat (current_directory, "/", filename); + } + + set_current_frame ( create_new_frame (read_register (FP_REGNUM), + read_pc ())); + select_frame (get_current_frame (), 0); + validate_files (); + } + else if (from_tty) + printf ("No core file now.\n"); +} + +exec_file_command (filename, from_tty) + char *filename; + int from_tty; +{ + int val; + + /* Eliminate all traces of old exec file. + Mark text segment as empty. */ + + if (execfile) + free (execfile); + execfile = 0; + data_start = 0; + data_end -= exec_data_start; + text_start = 0; + text_end = 0; + exec_data_start = 0; + exec_data_end = 0; + if (execchan >= 0) + close (execchan); + execchan = -1; + + /* Now open and digest the file the user requested, if any. */ + + if (filename) + { + execchan = openp (getenv ("PATH"), 1, filename, O_RDONLY, 0, + &execfile); + if (execchan < 0) + perror_with_name (filename); + +#ifdef COFF_FORMAT + { + int aout_hdrsize; + int num_sections; + + if (read_file_hdr (execchan, &file_hdr) < 0) + error ("\"%s\": not in executable format.", execfile); + + aout_hdrsize = file_hdr.f_opthdr; + num_sections = file_hdr.f_nscns; + + if (read_aout_hdr (execchan, &exec_aouthdr, aout_hdrsize) < 0) + error ("\"%s\": can't read optional aouthdr", execfile); + + if (read_section_hdr (execchan, _TEXT, &text_hdr, num_sections) < 0) + error ("\"%s\": can't read text section header", execfile); + + if (read_section_hdr (execchan, _DATA, &data_hdr, num_sections) < 0) + error ("\"%s\": can't read data section header", execfile); + + text_start = exec_aouthdr.text_start; + text_end = text_start + exec_aouthdr.tsize; + text_offset = text_hdr.s_scnptr; + exec_data_start = exec_aouthdr.data_start; + exec_data_end = exec_data_start + exec_aouthdr.dsize; + exec_data_offset = data_hdr.s_scnptr; + data_start = exec_data_start; + data_end += exec_data_start; + exec_mtime = file_hdr.f_timdat; + } +#else /* not COFF_FORMAT */ + { + struct stat st_exec; + + FILHDR exec_coffhdr; + + val = myread (execchan, &exec_coffhdr, sizeof exec_coffhdr); + if (val < 0) + perror_with_name (filename); + + val = myread (execchan, &exec_aouthdr, sizeof (AOUTHDR)); + + if (val < 0) + perror_with_name (filename); + + text_start = N_TXTADDR (exec_aouthdr); + exec_data_start = N_DATADDR (exec_aouthdr); + + text_offset = N_TXTOFF (exec_coffhdr, exec_aouthdr); + exec_data_offset = N_TXTOFF (exec_coffhdr, exec_aouthdr) + + exec_aouthdr.a_text; + + text_end = text_start + exec_aouthdr.a_text; + exec_data_end = exec_data_start + exec_aouthdr.a_data; + data_start = exec_data_start; + data_end += exec_data_start; + + fstat (execchan, &st_exec); + exec_mtime = st_exec.st_mtime; + } +#endif /* not COFF_FORMAT */ + + validate_files (); + } + else if (from_tty) + printf ("No exec file now.\n"); + + /* Tell display code (if any) about the changed file name. */ + if (exec_file_display_hook) + (*exec_file_display_hook) (filename); +} |