CVS commit: [netbsd-9] src/lib/libc/arch/hppa/sys

["Martin Husemann" <martin%netbsd.org@localhost>]

Module Name:    src
Committed By:   martin
Date:           Mon Jun  6 11:31:13 UTC 2022

Modified Files:
        src/lib/libc/arch/hppa/sys [netbsd-9]: ptrace.S

Log Message:
Pull up following revision(s) (requested by skrll in ticket #1464):

        lib/libc/arch/hppa/sys/ptrace.S: revision 1.8

Save and restore %r19 the "linkage table pointer register" across the call
to __cerror so if the ptrace syscall fails we can call __cerror again with
the correct %r19 value.

Do this even though the call of __cerror doesn't go via the PLT because
__cerror calls __errno which does.

Analysis and fix from Tom Lane in
PR port-hppa/56864: hppa: ptrace(2) dumps core when returning an error

I changed the location of where %r19 is stored on the stack to follow the
ABI.


To generate a diff of this commit:
cvs rdiff -u -r1.6 -r1.6.66.1 src/lib/libc/arch/hppa/sys/ptrace.S

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.