Use the softfloat conversion routines for conversion to 16 bit
integers, because just casting to a 16 bit type truncates the
value rather than saturating it at 16-bit MAXINT/MININT.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Nathan Froyd <froydnj@codesourcery.com>
VCVT of 16 bit fixed point to float should ignore the top 16 bits
of the source register. Cast to int16_t and friends rather than
int16 -- the former is guaranteed exactly 16 bits wide where the
latter is merely at least 16 bits wide (and so is usually 32 bits).
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Nathan Froyd <froydnj@codesourcery.com>
The ARM ARM defines that if the input to a single<->double conversion
is a NaN then the output is always forced to be a quiet NaN by setting
the most significant bit of the fraction part.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Nathan Froyd <froydnj@codesourcery.com>
The ARM architecture mandates that converting a NaN value to
integer gives zero (if Invalid Operation FP exceptions are
not being trapped). This isn't the behaviour of the SoftFloat
library, so NaNs must be special-cased.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Nathan Froyd <froydnj@codesourcery.com>
Fix errors in the decoding of the Neon forms of fixed-point VCVT:
* fixed-point VCVT is op 14 and 15, not 15 and 16
* the fbits immediate field was being misinterpreted
* the sense of the to_fixed bit was inverted
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Nathan Froyd <froydnj@codesourcery.com>
Correct the decoding of source and destination registers
for the VFP forms of the VCVT instructions which convert
between floating point and integer or fixed-point.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Nathan Froyd <froydnj@codesourcery.com>
Correct ldrexd and strexd code to always read and write the
high word of the 64-bit value from addr+4.
Also make ldrexd and strexd agree that for a 64 bit value the
address in env->exclusive_addr is that of the low word.
This fixes the issues reported in
https://bugs.launchpad.net/qemu/+bug/670883
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Nathan Froyd <froydnj@codesourcery.com>
Refine check on bkpt so that smc and undefined instruction encodings are
handled as an undefined instruction and trap.
Signed-off-by: Adam Lackorzynski <adam@os.inf.tu-dresden.de>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Nathan Froyd <froydnj@codesourcery.com>
The thumb2 decoder contained a mixup between the bit controlling
doubling and the bit controlling if the operation was an add or a sub.
Signed-off-by: Johan Bengtsson <teofrastius@gmail.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Nathan Froyd <froydnj@codesourcery.com>
The PKHxx instructions were not recognized by the thumb2 decoder. The
solution provided in this changeset is identical to the arm-mode
implementation.
Signed-off-by: Johan Bengtsson <teofrastius@gmail.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Nathan Froyd <froydnj@codesourcery.com>
Expose the vfp_get_fpscr() and vfp_set_fpscr() functions to C
code as well as generated code, so we can use them to read and
write the FPSCR when saving and restoring VFP registers across
signal handlers in linux-user mode.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@nokia.com>
In linux-user mode, the XScale/iWMMXT coprocessors must be enabled
at reset so that we can run code that uses these instructions.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
fprintf_function uses format checking with GCC_FMT_ATTR.
Format errors were fixed in
* target-i386/helper.c
* target-mips/translate.c
* target-ppc/translate.c
Cc: Blue Swirl <blauwirbel@gmail.com>
Signed-off-by: Stefan Weil <weil@mail.berlios.de>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
When combining multiple values as part of a NEON array load, do explcit
shift/or rather than using gen_bfi. This voids redundant mask
operations.
Signed-off-by: Paul Brook <paul@codesourcery.com>
Booting an arm kernel has been broken a while when booting from non zero start
address. This is due to the order of events: board init loads the kernel and
sets register 15 to the start address and then qemu_system_reset reset the cpu
making register 15 zero again.
This patch fixes the usage of the register 15 start address trick in
combination with arm_load_kernel.
Signed-off-by: Lars Munch <lars@segv.dk>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This prevent coprocessor IO structure from being reset on cpu reset. This was
a problem for PXA which uses coprocessor 6 and 14.
Signed-off-by: Lars Munch <lars@segv.dk>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This patch fixes few resource leaks in the iwmmxt disassemble.
Signed-off-by: Lars Munch <lars@segv.dk>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Move ARMv7-M PC/SP initialization to the CPU reset routine. Add a board
reset routine to call this. Also load values directly from ROM as
images have not been copied yet.
Avoid clearing the NVIC pointer on cpu reset.
Signed-off-by: Paul Brook <paul@codesourcery.com>
Don't set PAGE_EXEC for XN pages, to avoid a bypass of XN protection
checking if the page is already in the TLB.
Signed-off-by: Rabin Vincent <rabin@rab.in>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Do not try to insert a conditional jump over next instruction when the
condition code is AL as this will trigger an internal error.
Signed-off-by: Johan Bengtsson <teofrastius@gmail.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
QEMU uses a fixed page size for the CPU TLB. If the guest uses large
pages then we effectively split these into multiple smaller pages, and
populate the corresponding TLB entries on demand.
When the guest invalidates the TLB by virtual address we must invalidate
all entries covered by the large page. However the address used to
invalidate the entry may not be present in the QEMU TLB, so we do not
know which regions to clear.
Implementing a full vaiable size TLB is hard and slow, so just keep a
simple address/mask pair to record which addresses may have been mapped by
large pages. If the guest invalidates this region then flush the
whole TLB.
Signed-off-by: Paul Brook <paul@codesourcery.com>
The rfe instruction can be used with any register, not just sp. Adjust the
condition check accordingly.
Signed-off-by: Adam Lackorzynski <adam@os.inf.tu-dresden.de>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Removes a set of ifdefs from exec.c.
Introduce TARGET_VIRT_ADDR_SPACE_BITS for all targets other
than Alpha. This will be used for page_find_alloc, which is
supposed to be using virtual addresses in the first place.
Signed-off-by: Richard Henderson <rth@twiddle.net>
There's a return missing in the srs handling which leads to srs always being
treated an an invalid op.
Signed-off-by: Adam Lackorzynski <adam@os.inf.tu-dresden.de>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
implementation only widened the 32bit source vector elements into a
64bit destination vector but forgot to perform the actual shifting
operation.
Signed-off-by: Juha Riihimäki <juha.riihimaki@nokia.com>
Signed-off-by: Riku Voipio <riku.voipio@nokia.com>
Acked-by: Laurent Desnogues <laurent.desnogues@gmail.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
The rounding/truncating options were inverted. truncating
was done when rounding was meant and vice verse.
Signed-off-by: Riku Voipio <riku.voipio@nokia.com>
Acked-by: Laurent Desnogues <laurent.desnogues@gmail.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Support the "subs pc, lr" Thumb-2 exception return instruction.
Signed-off-by: Rabin Vincent <rabin@rab.in>
Signed-off-by: Paul Brook <paul@codesourcery.com>
The Thumb CPS currently does not work correctly: CPSID touches more bits
than the instruction wants to, and CPSIE does nothing. Fix it by
passing the correct mask (the "affect" bits) and value.
Signed-off-by: Rabin Vincent <rabin@rab.in>
Access the cp15.c13 TLS registers directly with TCG ops instead of with
a slow helper. If the the cp15 read/write was not TLS register access,
fall back to the cp15 helper.
This makes accessing __thread variables in linux-user when apps are compiled
with -mtp=cp15 possible. legal cp15 register to acces from linux-user are
already checked in cp15_user_ok.
While at it, make the cp15.c13 Thread ID registers available only on
ARMv6K and newer.
Signed-off-by: Riku Voipio <riku.voipio@nokia.com>
Current code is broken at least on recent compilers, comparison
between signed and unsigned types yield incorrect code and render
the neon shift helper functions defunct. This is the third revision
of this patch, casting all comparisons with the sizeof operator to
signed ssize_t type to force comparisons to be between signed integral
types.
Signed-off-by: Juha Riihimäki <juha.riihimaki@nokia.com>
Acked-by: Laurent Desnogues <laurent.desnogues@gmail.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Shift by immediate value is incorrectly overwritten by a temporary
variable in the processing of NEON vsri, vshl and vsli instructions.
This patch has been revised to also include a fix for the special
case where the code would previously try to shift an integer value
over 31 bits left/right.
Signed-off-by: Juha Riihimäki <juha.riihimaki@nokia.com>
Acked-by: Laurent Desnogues <laurent.desnogues@gmail.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
