https://bugs.kde.org/show_bug.cgi?id=501850
--- Comment #1 from Paul Floyd <pjfl...@wanadoo.fr> ---
I wrote a little test based on scalar
#include "scalar.h"
int main(void)
{
SY(SYS_sendfile, 1000, 2, 3, 4, 5, 6, 7, 8);
return(0);
}
I can comment out the sfMayBlock - the syscall will fail so no question of
blocking. That allows me to test both VG_(do_syscall) and
ML_(do_syscall_for_client_WRK).
On arm64 I get the right arguments in ktrace in both cases.
On both x86 and amd64 ML_(do_syscall_for_client_WRK) (with sfMayBlock) both
look OK.
On x86 VG_(do_syscall) (without sfMayBlock) looks OK
On amd64 VG_(do_syscall) (without sfMayBlock) looks bad
74122 memcheck-amd64-free CALL
sendfile(0x3e8,0x2,0x3,0x4,0x5,0x6,0x8<><invalid>8)
That last argument should be 7.
If I reverse the stack offsets used for a7 and a8 in do_syscall_WRK then I get
good results.
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