Date: Mon, 29 Jun 2015 16:33:31 +0800 From: Julian Elischer <julian@freebsd.org> To: "hackers@freebsd.org" <hackers@freebsd.org>, freebsd-current <freebsd-current@freebsd.org> Subject: libc compile failure with new syscall. Message-ID: <559102DB.4050902@freebsd.org>
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Hi all,
At $JOB we have a few extra syscalls that we have added to our kernel.
After generating the new sysent files in /sys/kern, libc fails to
compile with:
===> lib/libc (obj,depend,all,install)
building shared library libc.so.7
[...]
/usr/bin/ld: rlk_check_offline.So: relocation R_X86_64_32 against
`SYS_rlk_check_offline' can not be used when making a shared object;
recompile with -fPIC
rlk_check_offline.So: could not read symbols: Bad value
*** [libc.so.7] Error code 1
this suggests that the code that generates the libc syscall stubs is
generating something the linker doesn't like.
the definition of the syscall is:
588 AUE_NULL NOSTD { int rlk_check_offline(char *localfs,
char *path, \
int *is_offline, int rlk_flags, \
int *cache_status); }
------
which generates (in various files):
{ AS(rlk_check_offline_args), (sy_call_t *)lkmressys,
AUE_NULL, NULL, 0, 0, 0, SY_THR_ABSENT }, /* 588 = rlk_check_offline */
------
"rlk_check_offline", /* 588 =
rlk_check_offline */
------
/* rlk_check_offline */
case 588: {
struct rlk_check_offline_args *p = params;
uarg[0] = (intptr_t) p->localfs; /* char * */
uarg[1] = (intptr_t) p->path; /* char * */
uarg[2] = (intptr_t) p->is_offline; /* int * */
iarg[3] = p->rlk_flags; /* int */
uarg[4] = (intptr_t) p->cache_status; /* int * */
*n_args = 5;
break;
}
-------
#define SYS_rlk_check_offline 588
-------
struct rlk_check_offline_args {
char localfs_l_[PADL_(char *)]; char * localfs; char
localfs_r_[PADR_(char *)];
char path_l_[PADL_(char *)]; char * path; char
path_r_[PADR_(char *)];
char is_offline_l_[PADL_(int *)]; int * is_offline; char
is_offline_r_[PADR_(int *)];
char rlk_flags_l_[PADL_(int)]; int rlk_flags; char
rlk_flags_r_[PADR_(int)];
char cache_status_l_[PADL_(int *)]; int * cache_status; char
cache_status_r_[PADR_(int *)];
};
int sys_rlk_check_offline(struct thread *, struct
rlk_check_offline_args *);
#define SYS_AUE_rlk_check_offline AUE_NULL
-------
the generated stub looks like:
$ cat /usr/obj/usr/src/lib/libc/rlk_check_offline.S
#include "compat.h"
#include "SYS.h"
RSYSCALL(rlk_check_offline)
.section .note.GNU-stack,"",%progbits
--------
nothing in this definition looks special, So I'm surprised that the
libc build doesn't like it.
This is a (just) post 10.1 10-stable. But we plan to move to 11 soon too.
Any suggestions as to what I should change would be greatly
appreciated.. I'm running out of ideas.
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