406 lines
11 KiB
C
406 lines
11 KiB
C
/* 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);
|
||
}
|