8929906e21
The dh_alias redirect is intended to handle TCG types as distinguished
from C types. TCG does not distinguish signed int from unsigned int,
because they are the same size. However, we need to retain this
distinction for dh_typecode, lest we fail to extend abi types properly
for the host call parameters.
This bug was detected when running the 'arm' emulator on an s390
system. The s390 uses TCG_TARGET_EXTEND_ARGS which triggers code
in tcg_gen_callN to extend 32 bit values to 64 bits; the incorrect
sign data in the typemask for each argument caused the values to be
extended as unsigned values.
This simple program exhibits the problem:
static volatile int num = -9;
static volatile int den = -5;
int main(void)
{
int quo = num / den;
printf("num %d den %d quo %d\n", num, den, quo);
exit(0);
}
When run on the broken qemu, this results in:
num -9 den -5 quo 0
The correct result is:
num -9 den -5 quo 1
Fixes:
|
||
|---|---|---|
| .. | ||
| hax | ||
| hvf | ||
| kvm | ||
| nvmm | ||
| tcg | ||
| whpx | ||
| arch_dump.c | ||
| arch_memory_mapping.c | ||
| cpu-dump.c | ||
| cpu-internal.h | ||
| cpu-param.h | ||
| cpu-qom.h | ||
| cpu-sysemu.c | ||
| cpu.c | ||
| cpu.h | ||
| gdbstub.c | ||
| helper.c | ||
| helper.h | ||
| host-cpu.c | ||
| host-cpu.h | ||
| Kconfig | ||
| machine.c | ||
| meson.build | ||
| monitor.c | ||
| ops_sse_header.h | ||
| ops_sse.h | ||
| sev-sysemu-stub.c | ||
| sev.c | ||
| sev.h | ||
| shift_helper_template.h | ||
| svm.h | ||
| trace-events | ||
| trace.h | ||
| xsave_helper.c | ||