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| author |  Sven Schnelle <svens@linux.ibm.com>
| 2023-01-10 08:24:31 +0100 |
|---|---|---|
| committer |  Paul E. McKenney <paulmck@kernel.org>
| 2023-01-10 13:33:56 -0800 |
| commit | 241c4b4e02f25ceab21df8a28e1ac689a477c30c (patch) | |
| tree | 418c85d5df80f7c45c8e8b12871c13dc364457c2 /tools/include | |
| parent | tools/nolibc: add auxiliary vector retrieval for mips (diff) | |
| download | linux-241c4b4e02f25ceab21df8a28e1ac689a477c30c.tar.gz linux-241c4b4e02f25ceab21df8a28e1ac689a477c30c.tar.bz2 linux-241c4b4e02f25ceab21df8a28e1ac689a477c30c.zip | |
tools/nolibc: add auxiliary vector retrieval for s390
In the _start block we now iterate over envp to find the auxiliary
vector after the NULL. The pointer is saved into an _auxv variable
that is marked as weak so that it's accessible from multiple units.
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'tools/include')
| -rw-r--r-- | tools/include/nolibc/arch-s390.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/tools/include/nolibc/arch-s390.h b/tools/include/nolibc/arch-s390.h index 039b454e79f0..6b0e54ed543d 100644 --- a/tools/include/nolibc/arch-s390.h +++ b/tools/include/nolibc/arch-s390.h @@ -160,6 +160,7 @@ struct sys_stat_struct { }) char **environ __attribute__((weak)); +const unsigned long *_auxv __attribute__((weak)); /* startup code */ void __attribute__((weak,noreturn,optimize("omit-frame-pointer"))) _start(void) @@ -179,6 +180,15 @@ void __attribute__((weak,noreturn,optimize("omit-frame-pointer"))) _start(void) "larl %r1,environ\n" "stg %r4,0(%r1)\n" + /* search for auxv */ + "lgr %r5,%r4\n" /* start at envp */ + "1:\n" + "clg %r0,0(%r5)\n" /* entry zero? */ + "la %r5,8(%r5)\n" /* advance pointer */ + "jnz 1b\n" /* no -> test next pointer */ + "larl %r1,_auxv\n" /* yes -> store value in _auxv */ + "stg %r5,0(%r1)\n" + "aghi %r15,-160\n" /* allocate new stackframe */ "xc 0(8,%r15),0(%r15)\n" /* clear backchain */ "brasl %r14,main\n" /* ret value of main is arg to exit */ |