diff options
Diffstat (limited to 'gdb/arm-xdep.c')
| -rw-r--r-- | gdb/arm-xdep.c | 559 |
1 files changed, 559 insertions, 0 deletions
diff --git a/gdb/arm-xdep.c b/gdb/arm-xdep.c new file mode 100644 index 00000000000..f0d806e82e7 --- /dev/null +++ b/gdb/arm-xdep.c @@ -0,0 +1,559 @@ +/* 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 "arm-opcode.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; + 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) + { + 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. */ + fatal ("Internal: 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 |