On Sunday 15 April 2012 15:54:13 Denys Vlasenko wrote: > On 04/15/2012 08:21 PM, H.J. Lu wrote: > > Linux kernel v3.4 adds x32 support. Both x32 and n32 use 64bit offset > > for lseek parameter and return value. We need u_lrval to handle it > > properly. Also we shouldn't check HAVE_LONG_LONG_OFF_T for n32 lseek. > > Please explain further. Not many people are familiar with MIPS... > > Do syscalls on MIPS-n32 return 64-bit values even to 32-bit userspace? > How userspace is supposed to read that? Is 32-bit MIPS code > able to read 64-registers, or what?
you can largely think of it like so: MIPS n32 is to n64 as x32 is to x86_64. in other words, it's the same thing as the 64bit ABI but with 32bit pointers. so yes, 64bit values can pass back & forth in a single register. -mike
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