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This commit is the result of running the gdb/copyright.py script,
which automated the update of the copyright year range for all
source files managed by the GDB project to be updated to include
year 2023.
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I built GDB for all targets on a x86-64/GNU-Linux system, and
then (accidentally) passed GDB a RISC-V binary, and asked GDB to "run"
the binary on the native target. I got this error:
(gdb) show architecture
The target architecture is set to "auto" (currently "i386").
(gdb) file /tmp/hello.rv32.exe
Reading symbols from /tmp/hello.rv32.exe...
(gdb) show architecture
The target architecture is set to "auto" (currently "riscv:rv32").
(gdb) run
Starting program: /tmp/hello.rv32.exe
../../src/gdb/i387-tdep.c:596: internal-error: i387_supply_fxsave: Assertion `tdep->st0_regnum >= I386_ST0_REGNUM' failed.
What's going on here is this; initially the architecture is i386, this
is based on the default architecture, which is set based on the native
target. After loading the RISC-V executable the architecture of the
current inferior is updated based on the architecture of the
executable.
When we "run", GDB does a fork & exec, with the inferior being
controlled through ptrace. GDB sees an initial stop from the inferior
as soon as the inferior comes to life. In response to this stop GDB
ends up calling save_stop_reason (linux-nat.c), which ends up trying
to read register from the inferior, to do this we end up calling
target_ops::fetch_registers, which, for the x86-64 native target,
calls amd64_linux_nat_target::fetch_registers.
After this I eventually end up in i387_supply_fxsave, different x86
based targets will end in different functions to fetch registers, but
it doesn't really matter which function we end up in, the problem is
this line, which is repeated in many places:
i386_gdbarch_tdep *tdep = (i386_gdbarch_tdep *) gdbarch_tdep (arch);
The problem here is that the ARCH in this line comes from the current
inferior, which, as we discussed above, will be a RISC-V gdbarch, the
tdep field will actually be of type riscv_gdbarch_tdep, not
i386_gdbarch_tdep. After this cast we are relying on undefined
behaviour, in my case I happen to trigger an assert, but this might
not always be the case.
The thing I tried that exposed this problem was of course, trying to
start an executable of the wrong architecture on a native target. I
don't think that the correct solution for this problem is to detect,
at the point of cast, that the gdbarch_tdep object is of the wrong
type, but, I did wonder, is there a way that we could protect
ourselves from incorrectly casting the gdbarch_tdep object?
I think that there is something we can do here, and this commit is the
first step in that direction, though no actual check is added by this
commit.
This commit can be split into two parts:
(1) In gdbarch.h and arch-utils.c. In these files I have modified
gdbarch_tdep (the function) so that it now takes a template argument,
like this:
template<typename TDepType>
static inline TDepType *
gdbarch_tdep (struct gdbarch *gdbarch)
{
struct gdbarch_tdep *tdep = gdbarch_tdep_1 (gdbarch);
return static_cast<TDepType *> (tdep);
}
After this change we are no better protected, but the cast is now
done within the gdbarch_tdep function rather than at the call sites,
this leads to the second, much larger change in this commit,
(2) Everywhere gdbarch_tdep is called, we make changes like this:
- i386_gdbarch_tdep *tdep = (i386_gdbarch_tdep *) gdbarch_tdep (arch);
+ i386_gdbarch_tdep *tdep = gdbarch_tdep<i386_gdbarch_tdep> (arch);
There should be no functional change after this commit.
In the next commit I will build on this change to add an assertion in
gdbarch_tdep that checks we are casting to the correct type.
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This commit brings all the changes made by running gdb/copyright.py
as per GDB's Start of New Year Procedure.
For the avoidance of doubt, all changes in this commits were
performed by the script.
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Commit 345bd07cce33 ("gdb: fix gdbarch_tdep ODR violation") forgot to
update the gdbarch_tdep calls in the native files other than x86-64
Linux. This patch updates them all (to the best of my knowledge).
These are the files I was able to build-test:
aarch64-linux-nat.c
amd64-bsd-nat.c
arm-linux-nat.c
ppc-linux-nat.c
windows-nat.c
xtensa-linux-nat.c
And these are the ones I could not build-test:
aix-thread.c
arm-netbsd-nat.c
ppc-fbsd-nat.c
ppc-netbsd-nat.c
ia64-tdep.c (the part that needs libunwind)
ppc-obsd-nat.c
rs6000-nat.c
If there are still some build problems related to gdbarch_tdep in them,
they should be pretty obvious to fix.
Change-Id: Iaa3d791a850e4432973757598e634e3da6061428
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This commits the result of running gdb/copyright.py as per our Start
of New Year procedure...
gdb/ChangeLog
Update copyright year range in copyright header of all GDB files.
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The files used to be named 'nbsd', which incorrectly reflects
the name of the OS and confuses it with other BSD derived OSes.
gdb/ChangeLog:
* Makefile.in (ALL_64_TARGET_OBS, ALL_TARGET_OBS)
HFILES_NO_SRCDIR, ALLDEPFILES): Rename files.
* alpha-bsd-nat.c: Adjust include.
* alpha-bsd-tdep.h: Adjust comment.
* alpha-nbsd-tdep.c: Rename to ...
* alpha-netbsd-tdep.c: ... this, adjust include.
* amd64-nbsd-nat.c: Rename to ...
* amd64-netbsd-nat.c: ... this, adjust include.
* amd64-nbsd-tdep.c: Rename to ...
* amd64-netbsd-tdep.c: ... this, adjust include.
* amd64-tdep.h: Adjust include.
* arm-nbsd-nat.c: Rename to ...
* arm-netbsd-nat.c: ... this, adjust include.
* arm-nbsd-tdep.c: Rename to ...
* arm-netbsd-tdep.c: ... this, adjust include.
* arm-nbsd-tdep.h: Rename to ...
* arm-netbsd-tdep.h: ... this, adjust include.
* configure.nat: Adjust file lists.
* configure.tgt: Likewise.
* hppa-nbsd-nat.c: Rename to ...
* hppa-netbsd-nat.c: ... this, adjust include.
* hppa-nbsd-tdep.c: Rename to ...
* hppa-netbsd-tdep.c: ... this, adjust include.
* i386-nbsd-nat.c: Rename to ...
* i386-netbsd-nat.c: ... this, adjust include.
* i386-nbsd-tdep.c: Rename to ...
* i386-netbsd-tdep.c: ... this, adjust include.
* m68k-bsd-nat.c: Adjust include.
* mips-nbsd-nat.c: Rename to ...
* mips-netbsd-nat.c: ... this, adjust include.
* mips-nbsd-tdep.c: Rename to ...
* mips-netbsd-tdep.c: ... this, adjust include.
* mips-nbsd-tdep.h: Rename to ...
* mips-netbsd-tdep.h: ... this.
* nbsd-nat.c: Rename to ...
* netbsd-nat.c: ... this, adjust include.
* nbsd-nat.h: Rename to ...
* netbsd-nat.h: ... this, adjust include.
* nbsd-tdep.c: Rename to ...
* netbsd-tdep.c: ... this, adjust include.
* nbsd-tdep.h: Rename to ...
* netbsd-tdep.h: ... this.
* ppc-nbsd-nat.c: Rename to ...
* ppc-netbsd-nat.c: ... this, adjust include.
* ppc-nbsd-tdep.c: Rename to ...
* ppc-netbsd-tdep.c: ... this, adjust include and comment.
* ppc-nbsd-tdep.h: Rename to ...
* ppc-netbsd-tdep.h: ... this.
* sh-nbsd-nat.c: Rename to ...
* sh-netbsd-nat.c: ... this, adjust include.
* sh-nbsd-tdep.c: Rename to ...
* sh-netbsd-tdep.c: ... this, adjust include.
* sparc-nbsd-nat.c: Rename to ...
* sparc-netbsd-nat.c: ... this.
* sparc-nbsd-tdep.c: Rename to ...
* sparc-netbsd-tdep.c: ... this, adjust include.
* sparc64-nbsd-nat.c: Rename to ...
* sparc64-netbsd-nat.c: ... this.
* sparc64-nbsd-tdep.c: Rename to ...
* sparc64-netbsd-tdep.c: ... this, adjust include.
* sparc64-tdep.h: Adjust comment.
* vax-bsd-nat.c: Adjust include.
* vax-nbsd-tdep.c: Rename to ...
* vax-netbsd-tdep.c: ... this, adjust include.
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