e4439e4346
Consistently supply hardwired $zero as a zeroed register, correcting
issues with the PTRACE_GETREGS path that currently copies the value of
$restart into $zero as illustrated by this program:
$ cat read.c
int
main (void)
{
char buf[1024];
ssize_t size;
size = read (0, buf, sizeof (buf));
return size;
}
$
and this corresponding debug session:
(gdb) break main
Breakpoint 1 at 0x120000970: file read.c, line 9.
(gdb) target remote :2346
Remote debugging using :2346
Reading symbols from .../sysroot/mips-r2-hard/lib64/ld.so.1...done.
0x000000fff7fca5a0 in __start ()
from .../sysroot/mips-r2-hard/lib64/ld.so.1
(gdb) continue
Continuing.
Breakpoint 1, main () at read.c:9
9 size = read (0, buf, sizeof (buf));
(gdb) info registers
zero at v0 v1
R0 0000000000000000 0000000000000001 000000fff7ffe710 0000000000000000
a0 a1 a2 a3
R4 0000000000000001 000000ffffffeb88 000000ffffffeb98 0000000000000000
a4 a5 a6 a7
R8 000000fff7fc8800 000000fff7fc38f0 000000ffffffeb80 2f2f2f2f2f2f2f2f
t0 t1 t2 t3
R12 0000000000000437 0000000000000002 000000fff7ffd000 0000000120000a00
s0 s1 s2 s3
R16 000000fff7fc7068 0000000120000b90 0000000000000000 0000000000000000
s4 s5 s6 s7
R20 0000000000521d88 0000000000522608 0000000000000000 0000000000000000
t8 t9 k0 k1
R24 0000000000000000 0000000120000970 0000000000000000 0000000000000000
gp sp s8 ra
R28 000000fff7fc8800 000000ffffffea50 0000000000000000 000000fff7e4088c
status lo hi badvaddr
0000000000109cf3 0000000000005ea5 0000000000000211 000000fff7eadf00
cause pc
0000000000800024 0000000120000970
fcsr fir restart
00000000 00f30000 0000000000000000
(gdb) continue
Continuing.
^C
Program received signal SIGINT, Interrupt.
0x000000fff7f084ac in __GI___libc_read (fd=0, buf=0xffffffe640, nbytes=1024)
at ../sysdeps/unix/sysv/linux/read.c:27
27 return SYSCALL_CANCEL (read, fd, buf, nbytes);
(gdb) info registers
zero at v0 v1
R0 0000000000001388 0000000000000001 0000000000000200 000000fff7ffe710
a0 a1 a2 a3
R4 0000000000000000 000000ffffffe640 0000000000000400 0000000000000001
a4 a5 a6 a7
R8 000000fff7fc8800 000000fff7fc38f0 000000ffffffeb80 2f2f2f2f2f2f2f2f
t0 t1 t2 t3
R12 00000000000005e3 0000000000000002 000000fff7ffd000 000000012000099c
s0 s1 s2 s3
R16 000000fff7fc7068 0000000120000b90 0000000000000000 0000000000000000
s4 s5 s6 s7
R20 0000000000521d88 0000000000522608 0000000000000000 0000000000000000
t8 t9 k0 k1
R24 0000000000000000 000000fff7f2da20 0000000000000000 0000000000000000
gp sp s8 ra
R28 000000fff7fc8800 000000ffffffe600 0000000000000000 000000012000099c
status lo hi badvaddr
0000000000109cf3 00000000000001e6 00000000000000be 000000fff7f08470
cause pc
0000000000800020 000000fff7f084ac
fcsr fir restart
00000000 00f30000 0000000000001388
(gdb)
and with the PTRACE_PEEKUSR path that does not supply this register at
all, causing issues analogous to ones addressed for the native MIPS
backend with commit
|
||
|---|---|---|
| bfd | ||
| binutils | ||
| config | ||
| cpu | ||
| elfcpp | ||
| etc | ||
| gas | ||
| gdb | ||
| gold | ||
| gprof | ||
| include | ||
| intl | ||
| ld | ||
| libdecnumber | ||
| libiberty | ||
| opcodes | ||
| readline | ||
| sim | ||
| texinfo | ||
| zlib | ||
| .cvsignore | ||
| .gitattributes | ||
| .gitignore | ||
| COPYING | ||
| COPYING.LIB | ||
| COPYING.LIBGLOSS | ||
| COPYING.NEWLIB | ||
| COPYING3 | ||
| COPYING3.LIB | ||
| ChangeLog | ||
| MAINTAINERS | ||
| Makefile.def | ||
| Makefile.in | ||
| Makefile.tpl | ||
| README | ||
| README-maintainer-mode | ||
| compile | ||
| config-ml.in | ||
| config.guess | ||
| config.rpath | ||
| config.sub | ||
| configure | ||
| configure.ac | ||
| depcomp | ||
| djunpack.bat | ||
| install-sh | ||
| libtool.m4 | ||
| ltgcc.m4 | ||
| ltmain.sh | ||
| ltoptions.m4 | ||
| ltsugar.m4 | ||
| ltversion.m4 | ||
| lt~obsolete.m4 | ||
| makefile.vms | ||
| missing | ||
| mkdep | ||
| mkinstalldirs | ||
| move-if-change | ||
| setup.com | ||
| src-release.sh | ||
| symlink-tree | ||
| ylwrap | ||
README
README for GNU development tools This directory contains various GNU compilers, assemblers, linkers, debuggers, etc., plus their support routines, definitions, and documentation. If you are receiving this as part of a GDB release, see the file gdb/README. If with a binutils release, see binutils/README; if with a libg++ release, see libg++/README, etc. That'll give you info about this package -- supported targets, how to use it, how to report bugs, etc. It is now possible to automatically configure and build a variety of tools with one command. To build all of the tools contained herein, run the ``configure'' script here, e.g.: ./configure make To install them (by default in /usr/local/bin, /usr/local/lib, etc), then do: make install (If the configure script can't determine your type of computer, give it the name as an argument, for instance ``./configure sun4''. You can use the script ``config.sub'' to test whether a name is recognized; if it is, config.sub translates it to a triplet specifying CPU, vendor, and OS.) If you have more than one compiler on your system, it is often best to explicitly set CC in the environment before running configure, and to also set CC when running make. For example (assuming sh/bash/ksh): CC=gcc ./configure make A similar example using csh: setenv CC gcc ./configure make Much of the code and documentation enclosed is copyright by the Free Software Foundation, Inc. See the file COPYING or COPYING.LIB in the various directories, for a description of the GNU General Public License terms under which you can copy the files. REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info on where and how to report problems.