architecture: 0.911
i386: 0.863
x86: 0.855
performance: 0.825
device: 0.761
user-level: 0.745
kernel: 0.661
semantic: 0.651
ppc: 0.543
vnc: 0.537
graphic: 0.527
assembly: 0.499
debug: 0.484
PID: 0.473
TCG: 0.458
peripherals: 0.456
risc-v: 0.454
arm: 0.447
VMM: 0.435
network: 0.432
hypervisor: 0.382
mistranslation: 0.366
boot: 0.362
socket: 0.269
files: 0.259
virtual: 0.239
KVM: 0.221
register: 0.203
permissions: 0.188
--------------------
user-level: 0.934
debug: 0.853
i386: 0.518
x86: 0.488
virtual: 0.260
files: 0.122
TCG: 0.078
hypervisor: 0.054
kernel: 0.047
ppc: 0.027
architecture: 0.021
PID: 0.019
register: 0.018
semantic: 0.013
KVM: 0.012
performance: 0.011
device: 0.007
VMM: 0.005
network: 0.005
arm: 0.003
assembly: 0.003
socket: 0.003
peripherals: 0.002
graphic: 0.002
permissions: 0.001
boot: 0.001
vnc: 0.001
risc-v: 0.000
mistranslation: 0.000

linux-user: --strace incorrectly decodes writev arguments for 64-bit binaries on 32-bit machine
Description of problem:
With `--strace`, the arguments to `writev` appear to be decoded incorrectly.
The syscall still succeeds and has the expected effects.
Steps to reproduce:
```
$ cat main.c
#include <sys/uio.h>

int main(void) {
  struct iovec iov;
  iov.iov_base = "hello, world!\n";
  iov.iov_len = 14;
  return writev(1, &iov, 1);
}

$ aarch64-unknown-linux-gnu-gcc -static -o aarch64-main main.c

$ x86_64-pc-linux-gnu-gcc -static -o x86_64-main main.c

$ i686-pc-linux-gnu-gcc -static -o i686-main main.c

$ ./i686-main
hello, world!

$ strace ./i686-main |& grep writev
writev(1, [{iov_base="hello, world!\n", iov_len=14}], 1hello, world!

$ qemu-i386 --strace ./i686-main |& grep writev
21953 writev(1,0x407ffe54,0x1) = 14

$ qemu-x86_64 --strace ./x86_64-main |& grep writev
22218 writev(1,(nil),0x407ffcc0) = 14

$ qemu-aarch64 --strace ./aarch64-main |& grep writev
22523 writev(1,(nil),0x407ffcc8) = 14
```