| /* Acorn Risc Machine host machine support. |
| Copyright (C) 1988, 1989, 1991 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 "frame.h" |
| #include "inferior.h" |
| #include "opcode/arm.h" |
| |
| #include <sys/param.h> |
| #include <sys/dir.h> |
| #include <signal.h> |
| #include <sys/ioctl.h> |
| #include <sys/ptrace.h> |
| #include <machine/reg.h> |
| |
| #define N_TXTADDR(hdr) 0x8000 |
| #define N_DATADDR(hdr) (hdr.a_text + 0x8000) |
| |
| #include "gdbcore.h" |
| |
| #include <sys/user.h> /* After a.out.h */ |
| #include <sys/file.h> |
| #include "gdb_stat.h" |
| |
| #include <errno.h> |
| |
| void |
| fetch_inferior_registers (regno) |
| int regno; /* Original value discarded */ |
| { |
| 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 (PT_READ_U, inferior_pid, (PTRACE_ARG3_TYPE) offset, 0) |
| - KERNEL_U_ADDR; |
| |
| registers_fetched (); |
| |
| for (regno = 0; regno < 16; regno++) |
| { |
| regaddr = offset + regno * 4; |
| *(int *) &buf[0] = ptrace (PT_READ_U, inferior_pid, |
| (PTRACE_ARG3_TYPE) regaddr, 0); |
| if (regno == PC_REGNUM) |
| *(int *) &buf[0] = GET_PC_PART (*(int *) &buf[0]); |
| supply_register (regno, buf); |
| } |
| *(int *) &buf[0] = ptrace (PT_READ_U, inferior_pid, |
| (PTRACE_ARG3_TYPE) (offset + PC * 4), 0); |
| supply_register (PS_REGNUM, buf); /* set virtual register ps same as pc */ |
| |
| /* read the floating point registers */ |
| offset = (char *) &u.u_fp_regs - (char *) &u; |
| *(int *) buf = ptrace (PT_READ_U, inferior_pid, (PTRACE_ARG3_TYPE) offset, 0); |
| supply_register (FPS_REGNUM, buf); |
| for (regno = 16; regno < 24; regno++) |
| { |
| regaddr = offset + 4 + 12 * (regno - 16); |
| for (i = 0; i < 12; i += sizeof (int)) |
| *(int *) &buf[i] = ptrace (PT_READ_U, inferior_pid, |
| (PTRACE_ARG3_TYPE) (regaddr + i), 0); |
| 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). */ |
| |
| void |
| store_inferior_registers (regno) |
| int regno; |
| { |
| register unsigned int regaddr; |
| char buf[80]; |
| |
| struct user u; |
| unsigned long value; |
| unsigned int offset = (char *) &u.u_ar0 - (char *) &u; |
| offset = ptrace (PT_READ_U, inferior_pid, (PTRACE_ARG3_TYPE) offset, 0) |
| - KERNEL_U_ADDR; |
| |
| if (regno >= 0) |
| { |
| if (regno >= 16) |
| return; |
| regaddr = offset + 4 * regno; |
| errno = 0; |
| value = read_register (regno); |
| if (regno == PC_REGNUM) |
| value = SET_PC_PART (read_register (PS_REGNUM), value); |
| ptrace (PT_WRITE_U, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, value); |
| if (errno != 0) |
| { |
| sprintf (buf, "writing register number %d", regno); |
| perror_with_name (buf); |
| } |
| } |
| else |
| for (regno = 0; regno < 15; regno++) |
| { |
| regaddr = offset + regno * 4; |
| errno = 0; |
| value = read_register (regno); |
| if (regno == PC_REGNUM) |
| value = SET_PC_PART (read_register (PS_REGNUM), value); |
| ptrace (6, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, value); |
| if (errno != 0) |
| { |
| sprintf (buf, "writing all regs, number %d", regno); |
| perror_with_name (buf); |
| } |
| } |
| } |
| |
| /* Work with core dump and executable files, for GDB. |
| This code would be in corefile.c if it weren't machine-dependent. */ |
| |
| /* Structure to describe the chain of shared libraries used |
| by the execfile. |
| e.g. prog shares Xt which shares X11 which shares c. */ |
| |
| struct shared_library |
| { |
| struct exec_header header; |
| char name[SHLIBLEN]; |
| CORE_ADDR text_start; /* CORE_ADDR of 1st byte of text, this file */ |
| long data_offset; /* offset of data section in file */ |
| int chan; /* file descriptor for the file */ |
| struct shared_library *shares; /* library this one shares */ |
| }; |
| static struct shared_library *shlib = 0; |
| |
| /* Hook for `exec_file_command' command to call. */ |
| |
| extern void (*exec_file_display_hook) (); |
| |
| static CORE_ADDR unshared_text_start; |
| |
| /* extended header from exec file (for shared library info) */ |
| |
| static struct exec_header exec_header; |
| |
| void |
| core_file_command (filename, from_tty) |
| char *filename; |
| int from_tty; |
| { |
| int val; |
| |
| /* 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) |
| { |
| filename = tilde_expand (filename); |
| make_cleanup (free, filename); |
| |
| if (have_inferior_p ()) |
| error ("To look at a core file, you must kill the program 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; |
| |
| unsigned int reg_offset, fp_reg_offset; |
| |
| val = myread (corechan, &u, sizeof u); |
| if (val < 0) |
| perror_with_name ("Not a core file: reading upage"); |
| if (val != sizeof u) |
| error ("Not a core file: could only read %d bytes", val); |
| |
| /* We are depending on exec_file_command having been called |
| previously to set exec_data_start. Since the executable |
| and the core file share the same text segment, the address |
| of the data segment will be the same in both. */ |
| 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); |
| |
| /* Some machines put an absolute address in here and some put |
| the offset in the upage of the regs. */ |
| reg_offset = (int) u.u_ar0; |
| if (reg_offset > NBPG * UPAGES) |
| reg_offset -= KERNEL_U_ADDR; |
| fp_reg_offset = (char *) &u.u_fp_regs - (char *) &u; |
| |
| /* I don't know where to find this info. |
| So, for now, mark it as not available. */ |
| N_SET_MAGIC (core_aouthdr, 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]; |
| |
| if (regno < 16) |
| val = lseek (corechan, reg_offset + 4 * regno, 0); |
| else if (regno < 24) |
| val = lseek (corechan, fp_reg_offset + 4 + 12 * (regno - 24), 0); |
| else if (regno == 24) |
| val = lseek (corechan, fp_reg_offset, 0); |
| else if (regno == 25) |
| val = lseek (corechan, reg_offset + 4 * PC, 0); |
| if (val < 0 |
| || (val = myread (corechan, buf, sizeof buf)) < 0) |
| { |
| char *buffer = (char *) alloca (strlen (REGISTER_NAME (regno)) |
| + 30); |
| strcpy (buffer, "Reading register "); |
| strcat (buffer, REGISTER_NAME (regno)); |
| |
| perror_with_name (buffer); |
| } |
| |
| if (regno == PC_REGNUM) |
| *(int *) buf = GET_PC_PART (*(int *) buf); |
| supply_register (regno, buf); |
| } |
| } |
| } |
| if (filename[0] == '/') |
| corefile = savestring (filename, strlen (filename)); |
| else |
| { |
| corefile = concat (current_directory, "/", filename, NULL); |
| } |
| |
| flush_cached_frames (); |
| select_frame (get_current_frame (), 0); |
| validate_files (); |
| } |
| else if (from_tty) |
| printf ("No core file now.\n"); |
| } |
| |
| #if 0 |
| /* Work with core dump and executable files, for GDB. |
| This code would be in corefile.c if it weren't machine-dependent. */ |
| |
| /* Structure to describe the chain of shared libraries used |
| by the execfile. |
| e.g. prog shares Xt which shares X11 which shares c. */ |
| |
| struct shared_library |
| { |
| struct exec_header header; |
| char name[SHLIBLEN]; |
| CORE_ADDR text_start; /* CORE_ADDR of 1st byte of text, this file */ |
| long data_offset; /* offset of data section in file */ |
| int chan; /* file descriptor for the file */ |
| struct shared_library *shares; /* library this one shares */ |
| }; |
| static struct shared_library *shlib = 0; |
| |
| /* Hook for `exec_file_command' command to call. */ |
| |
| extern void (*exec_file_display_hook) (); |
| |
| static CORE_ADDR unshared_text_start; |
| |
| /* extended header from exec file (for shared library info) */ |
| |
| static struct exec_header exec_header; |
| |
| void |
| 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; |
| unshared_text_start = 0; |
| text_end = 0; |
| exec_data_start = 0; |
| exec_data_end = 0; |
| if (execchan >= 0) |
| close (execchan); |
| execchan = -1; |
| if (shlib) |
| { |
| close_shared_library (shlib); |
| shlib = 0; |
| } |
| |
| /* Now open and digest the file the user requested, if any. */ |
| |
| if (filename) |
| { |
| filename = tilde_expand (filename); |
| make_cleanup (free, filename); |
| |
| execchan = openp (getenv ("PATH"), 1, filename, O_RDONLY, 0, |
| &execfile); |
| if (execchan < 0) |
| perror_with_name (filename); |
| |
| { |
| struct stat st_exec; |
| |
| #ifdef HEADER_SEEK_FD |
| HEADER_SEEK_FD (execchan); |
| #endif |
| |
| val = myread (execchan, &exec_header, sizeof exec_header); |
| exec_aouthdr = exec_header.a_exec; |
| |
| if (val < 0) |
| perror_with_name (filename); |
| |
| text_start = 0x8000; |
| |
| /* Look for shared library if needed */ |
| if (exec_header.a_exec.a_magic & MF_USES_SL) |
| shlib = open_shared_library (exec_header.a_shlibname, text_start); |
| |
| text_offset = N_TXTOFF (exec_aouthdr); |
| exec_data_offset = N_TXTOFF (exec_aouthdr) + exec_aouthdr.a_text; |
| |
| if (shlib) |
| { |
| unshared_text_start = shared_text_end (shlib) & ~0x7fff; |
| stack_start = shlib->header.a_exec.a_sldatabase; |
| stack_end = STACK_END_ADDR; |
| } |
| else |
| unshared_text_start = 0x8000; |
| text_end = unshared_text_start + exec_aouthdr.a_text; |
| |
| exec_data_start = unshared_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; |
| } |
| |
| validate_files (); |
| } |
| else if (from_tty) |
| printf ("No executable file now.\n"); |
| |
| /* Tell display code (if any) about the changed file name. */ |
| if (exec_file_display_hook) |
| (*exec_file_display_hook) (filename); |
| } |
| #endif |
| |
| #if 0 |
| /* Read from the program's memory (except for inferior processes). |
| This function is misnamed, since it only reads, never writes; and |
| since it will use the core file and/or executable file as necessary. |
| |
| It should be extended to write as well as read, FIXME, for patching files. |
| |
| Return 0 if address could be read, EIO if addresss out of bounds. */ |
| |
| int |
| xfer_core_file (memaddr, myaddr, len) |
| CORE_ADDR memaddr; |
| char *myaddr; |
| int len; |
| { |
| register int i; |
| register int val; |
| int xferchan; |
| char **xferfile; |
| int fileptr; |
| int returnval = 0; |
| |
| while (len > 0) |
| { |
| xferfile = 0; |
| xferchan = 0; |
| |
| /* Determine which file the next bunch of addresses reside in, |
| and where in the file. Set the file's read/write pointer |
| to point at the proper place for the desired address |
| and set xferfile and xferchan for the correct file. |
| |
| If desired address is nonexistent, leave them zero. |
| |
| i is set to the number of bytes that can be handled |
| along with the next address. |
| |
| We put the most likely tests first for efficiency. */ |
| |
| /* Note that if there is no core file |
| data_start and data_end are equal. */ |
| if (memaddr >= data_start && memaddr < data_end) |
| { |
| i = min (len, data_end - memaddr); |
| fileptr = memaddr - data_start + data_offset; |
| xferfile = &corefile; |
| xferchan = corechan; |
| } |
| /* Note that if there is no core file |
| stack_start and stack_end define the shared library data. */ |
| else if (memaddr >= stack_start && memaddr < stack_end) |
| { |
| if (corechan < 0) |
| { |
| struct shared_library *lib; |
| for (lib = shlib; lib; lib = lib->shares) |
| if (memaddr >= lib->header.a_exec.a_sldatabase && |
| memaddr < lib->header.a_exec.a_sldatabase + |
| lib->header.a_exec.a_data) |
| break; |
| if (lib) |
| { |
| i = min (len, lib->header.a_exec.a_sldatabase + |
| lib->header.a_exec.a_data - memaddr); |
| fileptr = lib->data_offset + memaddr - |
| lib->header.a_exec.a_sldatabase; |
| xferfile = execfile; |
| xferchan = lib->chan; |
| } |
| } |
| else |
| { |
| i = min (len, stack_end - memaddr); |
| fileptr = memaddr - stack_start + stack_offset; |
| xferfile = &corefile; |
| xferchan = corechan; |
| } |
| } |
| else if (corechan < 0 |
| && memaddr >= exec_data_start && memaddr < exec_data_end) |
| { |
| i = min (len, exec_data_end - memaddr); |
| fileptr = memaddr - exec_data_start + exec_data_offset; |
| xferfile = &execfile; |
| xferchan = execchan; |
| } |
| else if (memaddr >= text_start && memaddr < text_end) |
| { |
| struct shared_library *lib; |
| for (lib = shlib; lib; lib = lib->shares) |
| if (memaddr >= lib->text_start && |
| memaddr < lib->text_start + lib->header.a_exec.a_text) |
| break; |
| if (lib) |
| { |
| i = min (len, lib->header.a_exec.a_text + |
| lib->text_start - memaddr); |
| fileptr = memaddr - lib->text_start + text_offset; |
| xferfile = &execfile; |
| xferchan = lib->chan; |
| } |
| else |
| { |
| i = min (len, text_end - memaddr); |
| fileptr = memaddr - unshared_text_start + text_offset; |
| xferfile = &execfile; |
| xferchan = execchan; |
| } |
| } |
| else if (memaddr < text_start) |
| { |
| i = min (len, text_start - memaddr); |
| } |
| else if (memaddr >= text_end |
| && memaddr < (corechan >= 0 ? data_start : exec_data_start)) |
| { |
| i = min (len, data_start - memaddr); |
| } |
| else if (corechan >= 0 |
| && memaddr >= data_end && memaddr < stack_start) |
| { |
| i = min (len, stack_start - memaddr); |
| } |
| else if (corechan < 0 && memaddr >= exec_data_end) |
| { |
| i = min (len, -memaddr); |
| } |
| else if (memaddr >= stack_end && stack_end != 0) |
| { |
| i = min (len, -memaddr); |
| } |
| else |
| { |
| /* Address did not classify into one of the known ranges. |
| This shouldn't happen; we catch the endpoints. */ |
| internal_error ("Bad case logic in xfer_core_file."); |
| } |
| |
| /* Now we know which file to use. |
| Set up its pointer and transfer the data. */ |
| if (xferfile) |
| { |
| if (*xferfile == 0) |
| if (xferfile == &execfile) |
| error ("No program file to examine."); |
| else |
| error ("No core dump file or running program to examine."); |
| val = lseek (xferchan, fileptr, 0); |
| if (val < 0) |
| perror_with_name (*xferfile); |
| val = myread (xferchan, myaddr, i); |
| if (val < 0) |
| perror_with_name (*xferfile); |
| } |
| /* If this address is for nonexistent memory, |
| read zeros if reading, or do nothing if writing. |
| Actually, we never right. */ |
| else |
| { |
| memset (myaddr, '\0', i); |
| returnval = EIO; |
| } |
| |
| memaddr += i; |
| myaddr += i; |
| len -= i; |
| } |
| return returnval; |
| } |
| #endif |