diff options
Diffstat (limited to 'sysdeps/aarch64/start.S')
| -rw-r--r-- | sysdeps/aarch64/start.S | 42 |
1 files changed, 31 insertions, 11 deletions
diff --git a/sysdeps/aarch64/start.S b/sysdeps/aarch64/start.S index efe24749f7..bad000f555 100644 --- a/sysdeps/aarch64/start.S +++ b/sysdeps/aarch64/start.S @@ -1,4 +1,4 @@ -/* Copyright (C) 1995-2016 Free Software Foundation, Inc. +/* Copyright (C) 1995-2018 Free Software Foundation, Inc. This file is part of the GNU C Library. @@ -16,6 +16,8 @@ License along with the GNU C Library. If not, see <http://www.gnu.org/licenses/>. */ +#include <sysdep.h> + /* This is the canonical entry point, usually the first thing in the text segment. @@ -25,7 +27,7 @@ At this entry point, most registers' values are unspecified, except: - x0 Contains a function pointer to be registered with `atexit'. + x0/w0 Contains a function pointer to be registered with `atexit'. This is how the dynamic linker arranges to have DT_FINI functions called for shared libraries that have been loaded before this code runs. @@ -52,26 +54,35 @@ _start: mov x5, x0 /* Load argc and a pointer to argv */ - ldr x1, [sp, #0] - add x2, sp, #8 + ldr PTR_REG (1), [sp, #0] + add x2, sp, #PTR_SIZE /* Setup stack limit in argument register */ mov x6, sp -#ifdef SHARED +#ifdef PIC +# ifdef SHARED adrp x0, :got:main - ldr x0, [x0, #:got_lo12:main] + ldr PTR_REG (0), [x0, #:got_lo12:main] adrp x3, :got:__libc_csu_init - ldr x3, [x3, #:got_lo12:__libc_csu_init] + ldr PTR_REG (3), [x3, #:got_lo12:__libc_csu_init] adrp x4, :got:__libc_csu_fini - ldr x4, [x4, #:got_lo12:__libc_csu_fini] + ldr PTR_REG (4), [x4, #:got_lo12:__libc_csu_fini] +# else + adrp x0, __wrap_main + add x0, x0, :lo12:__wrap_main + adrp x3, __libc_csu_init + add x3, x3, :lo12:__libc_csu_init + adrp x4, __libc_csu_fini + add x4, x4, :lo12:__libc_csu_fini +# endif #else /* Set up the other arguments in registers */ - ldr x0, =main - ldr x3, =__libc_csu_init - ldr x4, =__libc_csu_fini + MOVL (0, main) + MOVL (3, __libc_csu_init) + MOVL (4, __libc_csu_fini) #endif /* __libc_start_main (main, argc, argv, init, fini, rtld_fini, @@ -83,6 +94,15 @@ _start: /* should never get here....*/ bl abort +#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: + b main +#endif + /* Define a symbol for the first piece of initialized data. */ .data .globl __data_start |