The value previously chosen overlaps GUSA_MASK.
Rename all DELAY_SLOT_* and GUSA_* defines to emphasize
that they are included in TB_FLAGs. Add aliases for the
FPSCR and SR bits that are included in TB_FLAGS, so that
we don't accidentally reassign those bits.
Fixes: 4da06fb306 ("target/sh4: Implement prctl_unalign_sigbus")
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/856
Reviewed-by: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
For handling guest POSIX timers, we currently use an array
g_posix_timers[], whose entries are a host timer_t value, or 0 for
"this slot is unused". When the guest calls the timer_create syscall
we look through the array for a slot containing 0, and use that for
the new timer.
This scheme assumes that host timer_t values can never be zero. This
is unfortunately not a valid assumption -- for some host libc
versions, timer_t values are simply indexes starting at 0. When
using this kind of host libc, the effect is that the first and second
timers end up sharing a slot, and so when the guest tries to operate
on the first timer it changes the second timer instead.
Rework the timer allocation code, so that:
* the 'slot in use' indication uses a separate array from the
host timer_t array
* we grab the free slot atomically, to avoid races when multiple
threads call timer_create simultaneously
* releasing an allocated slot is abstracted out into a new
free_host_timer_slot() function called in the correct places
This fixes:
* problems on hosts where timer_t 0 is valid
* the FIXME in next_free_host_timer() about locking
* bugs in the error paths in timer_create where we forgot to release
the slot we grabbed, or forgot to free the host timer
Reported-by: Jon Alduan <jon.alduan@gmail.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20220725110035.1273441-1-peter.maydell@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
We don't emulate a preemptive kernel on this level, and the hppa architecture
doesn't allow context switches on the gateway page. So we always have to return
to sc_iaoq[] and not to gr[31].
This fixes the remaining random segfaults which still occured.
Signed-off-by: Helge Deller <deller@gmx.de>
Message-Id: <20220924114501.21767-8-deller@gmx.de>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
The hppa platform uses an upwards-growing stack and required in Linux
kernels < 5.18 an executable stack for signal processing. For that some
executables and libraries are marked to have an executable stack, for
which glibc uses the mprotect() syscall to mark the stack like this:
mprotect(xfa000000,4096,PROT_EXEC|PROT_READ|PROT_WRITE|PROT_GROWSUP).
Currently qemu will return -TARGET_EINVAL for this syscall because of the
checks in validate_prot_to_pageflags(), which doesn't allow the
PROT_GROWSUP or PROT_GROWSDOWN flags and thus triggers this error in the
guest:
error while loading shared libraries: libc.so.6: cannot enable executable stack as shared object requires: Invalid argument
Allow mprotect() to handle both flags and thus fix the guest.
The glibc tst-execstack testcase can be used to reproduce the issue.
Signed-off-by: Helge Deller <deller@gmx.de>
Message-Id: <20220924114501.21767-7-deller@gmx.de>
[lvivier: s/elif TARGET_HPPA/elif defined(TARGET_HPPA)/]
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
The hppa target requires a much bigger stack than many other targets,
and the Linux kernel allocates 80 MB by default for it.
This patch increases the guest stack for hppa to 80MB, and prevents
that this default stack size gets reduced by a lower stack limit on the
host.
Since the stack grows upwards on hppa, the stack_limit value marks the
upper boundary of the stack. Fix the output of /proc/self/maps (in the
guest) to show the [stack] marker on the correct memory area.
Signed-off-by: Helge Deller <deller@gmx.de>
Message-Id: <20220924114501.21767-6-deller@gmx.de>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
The stack-overflow check when building the "grep" debian package fails
on the debian hppa target. Reason is, that the guard page at the top
of the stack (which is added by qemu) prevents the fault handler in the
grep program to properly detect the stack overflow.
The Linux kernel on a physical machine doesn't install a guard page
either, so drop it and as such fix the build of "grep".
Signed-off-by: Helge Deller <deller@gmx.de>
Message-Id: <20220924114501.21767-5-deller@gmx.de>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
In Linux kernel v5.18 the vDSO for signal trampoline was added.
This code mimiks the bare minimum of this vDSO and thus avoids that the
parisc emulation needs executable stacks.
Signed-off-by: Helge Deller <deller@gmx.de>
Message-Id: <20220924114501.21767-4-deller@gmx.de>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This is a follow-up for commit 892a4f6a75 ("linux-user: Add partial
support for MADV_DONTNEED"), which added passthrough for anonymous
mappings. File mappings can be handled in a similar manner.
In order to do that, mark pages, for which mmap() was passed through,
with PAGE_PASSTHROUGH, and then allow madvise() passthrough for these
pages. Drop the explicit PAGE_ANON check, since anonymous mappings are
expected to have PAGE_PASSTHROUGH anyway.
Add PAGE_PASSTHROUGH to PAGE_STICKY in order to keep it on mprotect().
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220725125043.43048-1-iii@linux.ibm.com>
Message-Id: <20220906000839.1672934-5-iii@linux.ibm.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
The default implementation has several problems: the first argument is
not displayed as a pointer, making it harder to grep; the third
argument is not symbolized; and there are several extra unused
arguments.
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220906000839.1672934-4-iii@linux.ibm.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
