Should have done this much sooner given the amount of reviewing I'm
already doing in this area.
Signed-off-by: Darren Kenny <darren.kenny@oracle.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Alexander Bulekov <alxndr@bu.edu>
The timeout mechanism won't work if SIGALRM is blocked. This changes
unmasks SIGALRM when the timer is installed. This doesn't completely
solve the problem, as the fuzzer could trigger some device activity that
re-masks SIGALRM. However, there are currently no inputs on OSS-Fuzz
that re-mask SIGALRM and timeout. If that turns out to be a real issue,
we could try to hook sigmask-type calls, or use a separate timer thread.
Based-on: <20210713150037.9297-1-alxndr@bu.edu>
Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
Using ITIMER_VIRTUAL is a bad idea, if the fuzzer hits a blocking
syscall - e.g. ppoll with a NULL timespec. This causes timeout issues
while fuzzing some block-device code. Fix that by using wall-clock time.
This might cause inputs to timeout sometimes due to scheduling
effects/ambient load, but it is better than bringing the entire fuzzing
process to a halt.
Based-on: <20210713150037.9297-1-alxndr@bu.edu>
Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
By default, -fsanitize=fuzzer instruments all code with coverage
information. However, this means that libfuzzer will track coverage over
hundreds of source files that are unrelated to virtual-devices. This
means that libfuzzer will optimize inputs for coverage observed in timer
code, memory APIs etc. This slows down the fuzzer and stores many inputs
that are not relevant to the actual virtual-devices.
With this change, clang versions that support the
"-fsanitize-coverage-allowlist" will only instrument a subset of the
compiled code, that is directly related to virtual-devices.
Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
We have some configs for devices such as the AC97 and ES1370 that were
not matching memory-regions correctly, because the configs provided
lowercase names. To resolve these problems and prevent them from
occurring again in the future, convert both the pattern and names to
lower-case, prior to checking for a match.
Suggested-by: Darren Kenny <darren.kenny@oracle.com>
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
Using a custom timeout is useful to continue fuzzing complex devices,
even after we run into some slow code-path. However, simply adding a
fixed timeout to each input effectively caps the maximum input
length/number of operations at some artificial value. There are two
major problems with this:
1. Some code might only be reachable through long IO sequences.
2. Longer inputs can actually be _better_ for performance. While the
raw number of fuzzer executions decreases with larger inputs, the
number of MMIO/PIO/DMA operation/second actually increases, since
were are speding proportionately less time fork()ing.
With this change, we keep the custom-timeout, but we renew it, prior to
each MMIO/PIO/DMA operation. Thus, we time-out only when a specific
operation takes a long time.
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
The code mistakenly relied on address_space_translate to store the
length remaining until the next memory-region. We care about this
because when there is RAM or sparse-memory neighboring on an MMIO
region, we should only write up to the border, to prevent inadvertently
invoking MMIO handlers within the DMA callback.
However address_space_translate_internal only stores the length until
the end of the MemoryRegion if memory_region_is_ram(mr). Otherwise
the *len is left unmodified. This caused some false-positive issues,
where the fuzzer found a way to perform a nested MMIO write through a
DMA callback on an [address, length] that started within sparse memory
and spanned some device MMIO regions.
To fix this, write to sparse memory in small chunks of
memory_access_size (similar to the underlying address_space_write code),
which will prevent accidentally hitting MMIO handlers through large
writes.
Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
- Add a config for Shakti UART
- Fixup virt flash node
- Don't override users supplied ISA version
- Fixup some CSR accesses
- Use g_strjoinv() for virt machine PLIC string config
- Fix an overflow in the SiFive CLINT
- Add 64-bit register access helpers
- Replace tcg_const_* with direct constant usage
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Merge remote-tracking branch 'remotes/alistair/tags/pull-riscv-to-apply-20210901-2' into staging
First RISC-V PR for QEMU 6.2
- Add a config for Shakti UART
- Fixup virt flash node
- Don't override users supplied ISA version
- Fixup some CSR accesses
- Use g_strjoinv() for virt machine PLIC string config
- Fix an overflow in the SiFive CLINT
- Add 64-bit register access helpers
- Replace tcg_const_* with direct constant usage
# gpg: Signature made Wed 01 Sep 2021 03:08:48 BST
# gpg: using RSA key F6C4AC46D4934868D3B8CE8F21E10D29DF977054
# gpg: Good signature from "Alistair Francis <alistair@alistair23.me>" [full]
# Primary key fingerprint: F6C4 AC46 D493 4868 D3B8 CE8F 21E1 0D29 DF97 7054
* remotes/alistair/tags/pull-riscv-to-apply-20210901-2: (33 commits)
target/riscv: Use {get,dest}_gpr for RVV
target/riscv: Tidy trans_rvh.c.inc
target/riscv: Use {get,dest}_gpr for RVD
target/riscv: Use {get,dest}_gpr for RVF
target/riscv: Use gen_shift_imm_fn for slli_uw
target/riscv: Use {get,dest}_gpr for RVA
target/riscv: Reorg csr instructions
target/riscv: Fix hgeie, hgeip
target/riscv: Fix rmw_sip, rmw_vsip, rmw_hsip vs write-only operation
target/riscv: Use {get, dest}_gpr for integer load/store
target/riscv: Use get_gpr in branches
target/riscv: Use extracts for sraiw and srliw
target/riscv: Use DisasExtend in shift operations
target/riscv: Add DisasExtend to gen_unary
target/riscv: Move gen_* helpers for RVB
target/riscv: Move gen_* helpers for RVM
target/riscv: Use gen_arith for mulh and mulhu
target/riscv: Remove gen_arith_div*
target/riscv: Add DisasExtend to gen_arith*
target/riscv: Introduce DisasExtend and new helpers
...
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Remove gen_get_gpr, as the function becomes unused.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20210823195529.560295-25-richard.henderson@linaro.org
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Exit early if check_access fails.
Split out do_hlv, do_hsv, do_hlvx subroutines.
Use dest_gpr, get_gpr in the new subroutines.
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20210823195529.560295-24-richard.henderson@linaro.org
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20210823195529.560295-23-richard.henderson@linaro.org
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20210823195529.560295-22-richard.henderson@linaro.org
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Always use tcg_gen_deposit_z_tl; the special case for
shamt >= 32 is handled there.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20210823195529.560295-21-richard.henderson@linaro.org
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20210823195529.560295-20-richard.henderson@linaro.org
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Introduce csrr and csrw helpers, for read-only and write-only insns.
Note that we do not properly implement this in riscv_csrrw, in that
we cannot distinguish true read-only (rs1 == 0) from any other zero
write_mask another source register -- this should still raise an
exception for read-only registers.
Only issue gen_io_start for CF_USE_ICOUNT.
Use ctx->zero for csrrc.
Use get_gpr and dest_gpr.
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20210823195529.560295-19-richard.henderson@linaro.org
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
We failed to write into *val for these read functions;
replace them with read_zero. Only warn about unsupported
non-zero value when writing a non-zero value.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20210823195529.560295-18-richard.henderson@linaro.org
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
We distinguish write-only by passing ret_value as NULL.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20210823195529.560295-17-richard.henderson@linaro.org
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210823195529.560295-16-richard.henderson@linaro.org
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Narrow the scope of t0 in trans_jalr.
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210823195529.560295-15-richard.henderson@linaro.org
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
These operations can be done in one instruction on some hosts.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20210823195529.560295-14-richard.henderson@linaro.org
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
These operations are greatly simplified by ctx->w, which allows
us to fold gen_shiftw into gen_shift. Split gen_shifti into
gen_shift_imm_{fn,tl} like we do for gen_arith_imm_{fn,tl}.
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210823195529.560295-13-richard.henderson@linaro.org
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Use ctx->w for ctpopw, which is the only one that can
re-use the generic algorithm for the narrow operation.
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210823195529.560295-12-richard.henderson@linaro.org
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Move these helpers near their use by the trans_*
functions within insn_trans/trans_rvb.c.inc.
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210823195529.560295-11-richard.henderson@linaro.org
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Move these helpers near their use by the trans_*
functions within insn_trans/trans_rvm.c.inc.
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210823195529.560295-10-richard.henderson@linaro.org
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Split out gen_mulh and gen_mulhu and use the common helper.
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210823195529.560295-9-richard.henderson@linaro.org
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Use ctx->w and the enhanced gen_arith function.
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210823195529.560295-8-richard.henderson@linaro.org
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Most arithmetic does not require extending the inputs.
Exceptions include division, comparison and minmax.
Begin using ctx->w, which allows elimination of gen_addw,
gen_subw, gen_mulw.
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210823195529.560295-7-richard.henderson@linaro.org
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Introduce get_gpr, dest_gpr, temp_new -- new helpers that do not force
tcg globals into temps, returning a constant 0 for $zero as source and
a new temp for $zero as destination.
Introduce ctx->w for simplifying word operations, such as addw.
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210823195529.560295-6-richard.henderson@linaro.org
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
We will require the context to handle RV64 word operations.
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210823195529.560295-5-richard.henderson@linaro.org
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Utilize the condition in the movcond more; this allows some of
the setcond that were feeding into movcond to be removed.
Do not write into source1 and source2. Re-name "condN" to "tempN"
and use the temporaries for more than holding conditions.
Tested-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210823195529.560295-4-richard.henderson@linaro.org
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210823195529.560295-3-richard.henderson@linaro.org
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Replace uses of tcg_const_* with the allocate and free close together.
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210823195529.560295-2-richard.henderson@linaro.org
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
If we have a field that's wider than 32-bits, we need a data type wide enough to
be able to create the bitfield used to deposit the value.
Signed-off-by: Joe Komlodi <joe.komlodi@xilinx.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 1626805903-162860-3-git-send-email-joe.komlodi@xilinx.com
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
We already have some utilities to handle 64-bit wide registers, so this just
adds some more for:
- Initializing 64-bit registers
- Extracting and depositing to an array of 64-bit registers
Signed-off-by: Joe Komlodi <joe.komlodi@xilinx.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 1626805903-162860-2-git-send-email-joe.komlodi@xilinx.com
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
`muldiv64` would overflow in cases where the final 96-bit value does not
fit in a `uint64_t`. This would result in small values that cause an
interrupt to be triggered much sooner than intended.
The overflow can be detected in most cases by checking if the new value is
smaller than the previous value. If the final result is larger than
`diff` it is either correct or it doesn't matter as it is effectively
infinite anyways.
`next` is an `uint64_t` value, but `timer_mod` takes an `int64_t`. This
resulted in high values such as `UINT64_MAX` being converted to `-1`,
which caused an immediate timer interrupt.
By limiting `next` to `INT64_MAX` no overflow will happen while the
timer will still be effectively set to "infinitely" far in the future.
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/493
Signed-off-by: David Hoppenbrouwers <david@salt-inc.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20210827152324.5201-1-david@salt-inc.org
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
In the riscv virt machine init function, We assemble a string
plic_hart_config which is a comma-separated list of N copies of the
VIRT_PLIC_HART_CONFIG string. The code that does this has a
misunderstanding of the strncat() length argument. If the source
string is too large strncat() will write a maximum of length+1 bytes
(length bytes from the source string plus a trailing NUL), but the
code here assumes that it will write only length bytes at most.
This isn't an actual bug because the code has correctly precalculated
the amount of memory it needs to allocate so that it will never be
too small (i.e. we could have used plain old strcat()), but it does
mean that the code looks like it has a guard against accidental
overrun when it doesn't.
Rewrite the string handling here to use the glib g_strjoinv()
function, which means we don't need to do careful accountancy of
string lengths, and makes it clearer that what we're doing is
"create a comma-separated string".
Fixes: Coverity 1460752
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20210812144647.10516-1-peter.maydell@linaro.org
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
For U-mode CSRs, read-only check is also needed.
Signed-off-by: LIU Zhiwei <zhiwei_liu@c-sky.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Message-id: 20210810014552.4884-1-zhiwei_liu@c-sky.com
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
For some cpu, the isa version has already been set in cpu init function.
Thus only override the isa version when isa version is not set, or
users set different isa version explicitly by cpu parameters.
Signed-off-by: LIU Zhiwei <zhiwei_liu@c-sky.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Message-id: 20210811144612.68674-1-zhiwei_liu@c-sky.com
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
When privilege check fails, RISCV_EXCP_ILLEGAL_INST is returned,
not -1 (RISCV_EXCP_NONE).
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20210807141025.31808-1-bmeng.cn@gmail.com
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
The flash is not inside the SoC, so it's inappropriate to put it
under the /soc node. Move it to root instead.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20210807035641.22449-1-bmeng.cn@gmail.com
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Use a dedicated UART config(CONFIG_SHAKTI_UART) to select
shakti uart.
Signed-off-by: Vijai Kumar K <vijai@behindbytes.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20210731190229.137483-1-vijai@behindbytes.com
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
The current implementation lacks migration support. After migration,
vdagent support will be broken (even after a restart of the daemons).
Let's try to fix it in 6.2.
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20210805135715.857938-19-marcandre.lureau@redhat.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Rather than leaving the agent timing out or hanging, reply to it with an
empty result.
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20210805135715.857938-15-marcandre.lureau@redhat.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
The clipboard unit now tracks the current clipboard grab, no need to
duplicate this work.
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20210805135715.857938-14-marcandre.lureau@redhat.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Darren Kenny
Alexander Bulekov
Peter Maydell
Richard Henderson
Joe Komlodi
David Hoppenbrouwers
LIU Zhiwei
Bin Meng
Vijai Kumar K
Marc-André Lureau