diff options
Diffstat (limited to 'sysdeps/s390/s390-64/start.S')
| -rw-r--r-- | sysdeps/s390/s390-64/start.S | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/sysdeps/s390/s390-64/start.S b/sysdeps/s390/s390-64/start.S index 33c1302049..f4c3f51315 100644 --- a/sysdeps/s390/s390-64/start.S +++ b/sysdeps/s390/s390-64/start.S @@ -84,10 +84,25 @@ _start: /* Ok, now branch to the libc main routine. */ #ifdef PIC +# ifdef SHARED + /* Used for dynamic linked position independent executable. + => Scrt1.o */ larl %r2,main@GOTENT # load pointer to main lg %r2,0(%r2) +# else + /* Used for dynamic linked position dependent executable. + => crt1.o (glibc configured without --disable-default-pie: + PIC is defined) + Or for static linked position independent executable. + => rcrt1.o (only available if glibc configured without + --disable-default-pie: PIC is defined) */ + larl %r2,__wrap_main +# endif brasl %r14,__libc_start_main@plt #else + /* Used for dynamic/static linked position dependent executable. + => crt1.o (glibc configured with --disable-default-pie: + PIC and SHARED are not defined) */ larl %r2,main # load pointer to main brasl %r14,__libc_start_main #endif @@ -97,6 +112,19 @@ _start: cfi_endproc +#if defined PIC && !defined SHARED + /* When main is not defined in the executable but in a shared library + then a wrapper is needed in crt1.o of the static-pie enabled libc, + because crt1.o and rcrt1.o share code and the later must avoid the + use of GOT relocations before __libc_start_main is called. */ +__wrap_main: + cfi_startproc + larl %r1,main@GOTENT # load pointer to main + lg %r1,0(%r1) + br %r1 + cfi_endproc +#endif + /* Define a symbol for the first piece of initialized data. */ .data .globl __data_start |