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| author | Szabolcs Nagy <szabolcs.nagy@arm.com> | 2021-12-30 17:08:36 +0000 |
|---|---|---|
| committer | Szabolcs Nagy <szabolcs.nagy@arm.com> | 2022-05-04 16:11:57 +0100 |
| commit | fc7beebceb042e2ed7e50215425dea092744b162 (patch) | |
| tree | 28409ce1d00cddf02245e09f20a8f3d547c38331 /sysdeps/aarch64/dl-start.S | |
| parent | 3f32aa2bdd587520534496b41a7225ea42804734 (diff) | |
| download | glibc-fc7beebceb042e2ed7e50215425dea092744b162.tar.gz glibc-fc7beebceb042e2ed7e50215425dea092744b162.tar.xz glibc-fc7beebceb042e2ed7e50215425dea092744b162.zip | |
aarch64: Move ld.so _start to separate file and drop _dl_skip_args nsz/bug23293-v5
A separate asm file is easier to maintain than a macro that expands to inline asm. The RTLD_START macro is only needed now because _dl_start is local in rtld.c, but _start has to call it, if _dl_start was made hidden then it could be empty. _dl_skip_args is no longer needed. --- v4: - adjust commit message about _dl_skip_args. v3: - mention _dl_skip_args v2: - fix typo in commit message.
Diffstat (limited to 'sysdeps/aarch64/dl-start.S')
| -rw-r--r-- | sysdeps/aarch64/dl-start.S | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/sysdeps/aarch64/dl-start.S b/sysdeps/aarch64/dl-start.S new file mode 100644 index 0000000000..a3a57bd5a1 --- /dev/null +++ b/sysdeps/aarch64/dl-start.S @@ -0,0 +1,53 @@ +/* ld.so _start code. + Copyright (C) 2022 Free Software Foundation, Inc. + + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <https://www.gnu.org/licenses/>. */ + +#include <sysdep.h> + +ENTRY (_start) + /* Create an initial frame with 0 LR and FP */ + cfi_undefined (x30) + mov x29, #0 + mov x30, #0 + + mov x0, sp + PTR_ARG (0) + bl _dl_start + /* Returns user entry point in x0. */ + mov PTR_REG (21), PTR_REG (0) +.globl _dl_start_user +.type _dl_start_user, %function +_dl_start_user: + /* Get argc. */ + ldr PTR_REG (1), [sp] + /* Get argv. */ + add x2, sp, PTR_SIZE + /* Compute envp. */ + add PTR_REG (3), PTR_REG (2), PTR_REG (1), lsl PTR_LOG_SIZE + add PTR_REG (3), PTR_REG (3), PTR_SIZE + adrp x16, _rtld_local + add PTR_REG (16), PTR_REG (16), :lo12:_rtld_local + ldr PTR_REG (0), [x16] + bl _dl_init + /* Load the finalizer function. */ + adrp x0, _dl_fini + add PTR_REG (0), PTR_REG (0), :lo12:_dl_fini + /* Jump to the user's entry point. */ + mov x16, x21 + br x16 +END (_start) |