Identical to riscv64 except for stack offsets in clone.

Largely copied from riscv64 but required recalculation of offsets.

Identical to riscv64.

These are identical to riscv64.

__res_send returns the full answer length even if it didn't fit the
buffer, but __dns_parse expects the length of the filled part of the
buffer.

This is analogous to commit 77327ed064bd57b0e1865cd0e0364057ff4a53b4,
which fixed the only other __dns_parse call site.

A child process created by posix_spawn reports errors to its parent via
a pipe, retrying infinitely on any write error to prevent falsely
reporting success. If the (original) parent dies before write is
attempted, there is nobody to report to, but the child will remain
stuck in the write loop forever if SIGPIPE is blocked or ignored.
Fix this by not retrying write if it fails with EPIPE.

According to LoongArch ABI Specs, stack need to be 16 align to improve
performance and compiler layout of stack frames.

Matches glibc behavior and fixes a case where we could fall off the
function without returning a value.

this code dates back to the original commit of the sh port, with no
real clue as to how the bug was introduced. it looks like it was
written to assume the return address was pushed to the stack like on
x86, rather than arriving in the pr special register.