An empty environment is sometimes useful in user mode.
The new option provides it for linux-user and bsd-user
(darwin-user still has no environment related options).
The patch also adds the documentation for other
environment related options.
Signed-off-by: Stefan Weil <weil@mail.berlios.de>
Since version 4.4.x, gcc supports additional format attributes.
__attribute__ ((format (gnu_printf, 1, 2)))
should be used instead of
__attribute__ ((format (printf, 1, 2))
because QEMU always uses standard format strings (even with mingw32).
The patch replaces format attribute printf / __printf__ by macro
GCC_FMT_ATTR which uses gnu_printf if supported.
It also removes an #ifdef __GNUC__ (not needed any longer).
Cc: Blue Swirl <blauwirbel@gmail.com>
Signed-off-by: Stefan Weil <weil@mail.berlios.de>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
Because of the use of unsigned type, possible errors during
load were ignored.
Fix by using a signed type.
This also avoids a warning with GCC flag -Wtype-limits.
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
-1ul is unsigned long, which does not necessarily match abi_ulong
type.
Fix by using abi_long instead.
This also avoids a warning with GCC flag -Wtype-limits.
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
On many systems, socklen_t is defined as unsigned. This means that
checks for negative values are not meaningful.
Fix by explicitly casting to a signed integer.
This also avoids some warnings with GCC flag -Wtype-limits.
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
Commit 68a1c81686 broke qemu on hosts not
using guest base. It uses reserved_va unconditionally in mmap.c. To
avoid to many #ifdef #endif blocks, define RESERVED_VA as either
reserved_va or 0ul, and use it instead of reserved_va, similarly to what
has been done with guest_base/GUEST_BASE.
This requires moving the PT_INTERP extraction and GUEST_BASE
handling into load_elf_image. Key this off a non-null pointer
argument to receive the interpreter name.
Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
Moving toward a single copy of the elf binary loading code.
Fill in the details of the loaded image into a struct image_info.
Adjust create_elf_tables to read from such structures instead
of from a collection of passed arguments. Don't return error
values from load_elf_interp; always exit(-1) with a message to
stderr. Collect elf_interpreter handling in load_elf_binary
to a common spot.
Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
At the bottom of the a.out support was the unimplemented load_aout_interp
function. There were other portions of the support that didn't look
right; when I went to look in the Linux kernel for clarification, I found
that the support for such interpreters has been removed from binfmt_elf.
There doesn't seem to be any reason to keep this broken support in qemu.
Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
There are no supported stack-grows-up targets. We were putting
the guard page at the highest address, i.e. the bottom of the stack.
Use the maximum of host and guest page size for the guard size.
Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
Validate more fields of the elf header. Extract those checks
into two common functions to be used in both load_elf_interp
and load_elf_binary.
Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
First, adjust load_symbols to accept a load_bias parameter. At the same
time, read the entire section header table in one go, use pread instead
f lseek+read for the symbol and string tables, and properly free
allocated structures on error exit paths.
Second, adjust load_elf_interp to compute load_bias. This requires
finding out the built-in load addresses. Which allows us to honor a
pre-linked interpreter image when possible, and eliminate the hard-coded
INTERP_MAP_SIZE value.
Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
Remove ifdefs from code by defining empty inline functions
when byte swapping isn't needed. Push loops over swapping
arrays of structures into the swapping functions.
Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
The only consideration on this value is the target endianness.
The existing defines were incorrect for alpha and sh4eb.
Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
Define BPRM_BUF_SIZE to 1k and read that amount initially. If the
data we want from the binary is in this buffer, use it instead of
reading from the file again.
Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
Moving some PPC AT_* constants from elfload.c at the same time.
Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
I caught padzero not properly initializing the .bss segment
on a statically linked Alpha program. Rather than a minimal
patch, replace the gross code with a single mmap+memset.
Share more code between load_elf_interp and load_elf_binary.
Legally, an ELF program need not have just a single .bss;
and PT_LOAD segment can have memsz > filesz.
Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
There is disagreement between microblaze glibc and the kernel
to what the third arg of signal handlers should point to.
Change QEMU linux-user to match the kernel port. glibc patches
are pending.
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@petalogix.com>
As it is done for qemu-system with "-cpu ?", when cpu_list_id() is missing
for a target, call cpu_list() instead.
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
When loading a shared library that requires an executable stack,
glibc uses the mprotext PROT_GROWSDOWN flag to achieve this.
We don't support PROT_GROWSDOWN.
Add a special case to handle changing the stack permissions in this way.
Signed-off-by: Paul Brook <paul@codesourcery.com>
There's no _llseek on s390x either. Replace the existing
test for __x86_64__ with a functional test for __NR_llseek.
Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Since we're no longer setting PAGE_RESERVED, there's no need to
implement qemu_malloc via mmap.
Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Libc will fallback gracefully if pselect6 is not available. Thus put
pselect6 to nowarn until the atomicity issues of the original pselect6
patch are dealt with.
Signed-off-by: Riku Voipio <riku.voipio@nokia.com>
Cc: Michael Casadevall <mcasadevall@ubuntu.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This will allow backends to make intelligent choices about how
to implement GUEST_BASE.
Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Alpha passes oldset by value in a register, and returns the newset
as the return value; as compared to the standard implementation in
which both are passed by reference. This requires being able to
distinguish negative return values that are not errors. Do this in
the same way as the Alpha Linux kernel, by storing a zero in V0 in
the implementation of the syscall.
At the same time, fix a think-o in the regular sigprocmask path in
which we passed the target, rather than the host, HOW value.
Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Alpha passes the signal set in a register, not by reference.
Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
At the same time, tidy the code wrt MIPS and SH4 which have the
same two register return mechanism. Fix confusion between pipe
and pipe2 with an explicit flags=0, when the guest will not be
using the two register return mechanism.
Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
189 was allocated in upstream binutils.
0xbaab was the old temporary value. Still used by some tools and the
linux kernel.
I've seen 115 in older gdb versions, but lets ignore that one.
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
rlim_t conversion between host and target added.
Otherwise there are some incorrect case like
- RLIM_INFINITY on 32bit target -> 64bit host.
- RLIM_INFINITY on 64bit host -> mips and sparc target ?
- Big value(for 32bit target) on 64bit host -> 32bit target.
One is added into getrlimit, setrlimit, and ugetrlimit. It converts both
RLIM_INFINITY and value bigger than target can hold(>31bit) to RLIM_INFINITY.
Another one is added to guest_stack_size calculation introduced by
703e0e89. The rule is mostly same except the result on the case is keeping
the value of guest_stack_size.
Slightly tested for SH4, and x86_64 -linux-user on x86_64-pc-linux host.
Signed-off-by: Takashi YOSHII <takasi-y@ops.dti.ne.jp>
Acked-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Recalculate Sparc64 CPU flags on interrupts, otherwise some earlier
flags could be stored to pstate.
Refactor PSR/CCR/CWP handling: concentrate the actual
functions to op_helper.c.
Thanks to Igor Kovalenko for reporting.
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
The usermode PAGE_RESERVED code is not required by the current mmap
implementation, and is already broken when guest_base != 0.
Unfortunately the bsd emulation still uses the old mmap implementation,
so we can't rip it out altogether.
Signed-off-by: Paul Brook <paul@codesourcery.com>
