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authorK. Richard Pixley <rich@cygnus>1991-03-28 16:26:26 +0000
committerK. Richard Pixley <rich@cygnus>1991-03-28 16:26:26 +0000
commitbd5635a1e2b38ee8432fcdaa6456079191375277 (patch)
treeffc4c35618c4b6af001f38247ed0d1c05c7a35ad /gdb/arm-tdep.c
parent5a131cc7f0469e0375872605593e4a9c5d1eaefb (diff)
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Initial revision
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-rw-r--r--gdb/arm-tdep.c406
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diff --git a/gdb/arm-tdep.c b/gdb/arm-tdep.c
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+/* Copyright (C) 1988, 1989 Free Software Foundation, Inc.
+
+This file is part of GDB.
+
+GDB 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 1, or (at your option)
+any later version.
+
+GDB 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 GDB; see the file COPYING. If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#include "defs.h"
+#include "param.h"
+#include "frame.h"
+#include "inferior.h"
+#include "arm-opcode.h"
+
+#include <stdio.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 <sys/stat.h>
+
+#include <errno.h>
+
+
+/* Work with core dump and executable files, for GDB.
+ This code would be in core.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 exec file now.\n");
+
+ /* Tell display code (if any) about the changed file name. */
+ if (exec_file_display_hook)
+ (*exec_file_display_hook) (filename);
+}
+
+/* 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
+ {
+ bzero (myaddr, i);
+ returnval = EIO;
+ }
+
+ memaddr += i;
+ myaddr += i;
+ len -= i;
+ }
+ return returnval;
+}
+
+/* APCS (ARM procedure call standard) defines the following prologue:
+
+ mov ip, sp
+ [stmfd sp!, {a1,a2,a3,a4}]
+ stmfd sp!, {...,fp,ip,lr,pc}
+ [stfe f7, [sp, #-12]!]
+ [stfe f6, [sp, #-12]!]
+ [stfe f5, [sp, #-12]!]
+ [stfe f4, [sp, #-12]!]
+ sub fp, ip, #nn // nn == 20 or 4 depending on second ins
+*/
+
+CORE_ADDR
+skip_prologue(pc)
+CORE_ADDR pc;
+{
+ union insn_fmt op;
+ CORE_ADDR skip_pc = pc;
+
+ op.ins = read_memory_integer(skip_pc, 4);
+ /* look for the "mov ip,sp" */
+ if (op.generic.type != TYPE_ARITHMETIC ||
+ op.arith.opcode != OPCODE_MOV ||
+ op.arith.dest != SPTEMP ||
+ op.arith.operand2 != SP) return pc;
+ skip_pc += 4;
+ /* skip the "stmfd sp!,{a1,a2,a3,a4}" if its there */
+ op.ins = read_memory_integer(skip_pc, 4);
+ if (op.generic.type == TYPE_BLOCK_BRANCH &&
+ op.generic.subtype == SUBTYPE_BLOCK &&
+ op.block.mask == 0xf &&
+ op.block.base == SP &&
+ op.block.is_load == 0 &&
+ op.block.writeback == 1 &&
+ op.block.increment == 0 &&
+ op.block.before == 1) skip_pc += 4;
+ /* skip the "stmfd sp!,{...,fp,ip,lr,pc} */
+ op.ins = read_memory_integer(skip_pc, 4);
+ if (op.generic.type != TYPE_BLOCK_BRANCH ||
+ op.generic.subtype != SUBTYPE_BLOCK ||
+ /* the mask should look like 110110xxxxxx0000 */
+ (op.block.mask & 0xd800) != 0xd800 ||
+ op.block.base != SP ||
+ op.block.is_load != 0 ||
+ op.block.writeback != 1 ||
+ op.block.increment != 0 ||
+ op.block.before != 1) return pc;
+ skip_pc += 4;
+ /* check for "sub fp,ip,#nn" */
+ op.ins = read_memory_integer(skip_pc, 4);
+ if (op.generic.type != TYPE_ARITHMETIC ||
+ op.arith.opcode != OPCODE_SUB ||
+ op.arith.dest != FP ||
+ op.arith.operand1 != SPTEMP) return pc;
+ return skip_pc + 4;
+}
+
+static void
+print_fpu_flags(flags)
+int flags;
+{
+ if (flags & (1 << 0)) fputs("IVO ", stdout);
+ if (flags & (1 << 1)) fputs("DVZ ", stdout);
+ if (flags & (1 << 2)) fputs("OFL ", stdout);
+ if (flags & (1 << 3)) fputs("UFL ", stdout);
+ if (flags & (1 << 4)) fputs("INX ", stdout);
+ putchar('\n');
+}
+
+void
+arm_float_info()
+{
+ register unsigned long status = read_register(FPS_REGNUM);
+ int type;
+
+ type = (status >> 24) & 127;
+ printf("%s FPU type %d\n",
+ (status & (1<<31)) ? "Hardware" : "Software",
+ type);
+ fputs("mask: ", stdout);
+ print_fpu_flags(status >> 16);
+ fputs("flags: ", stdout);
+ print_fpu_flags(status);
+}