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/* PLT trampolines. ARM version.
Copyright (C) 2005-2025 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/>. */
/* ??? Needs more rearrangement for the LDM to handle thumb mode. */
#define NO_THUMB
#include <sysdep.h>
#include <libc-symbols.h>
.text
.globl _dl_runtime_resolve
.type _dl_runtime_resolve, #function
CFI_SECTIONS
cfi_startproc
.align 2
_dl_runtime_resolve:
cfi_adjust_cfa_offset (4)
cfi_rel_offset (lr, 0)
@ we get called with
@ stack[0] contains the return address from this call
@ ip contains &GOT[n+3] (pointer to function)
@ lr points to &GOT[2]
@ Save arguments. We save r4 to realign the stack.
push {r0-r4}
cfi_adjust_cfa_offset (20)
cfi_rel_offset (r0, 0)
cfi_rel_offset (r1, 4)
cfi_rel_offset (r2, 8)
cfi_rel_offset (r3, 12)
@ get pointer to linker struct
ldr r0, [lr, #-4]
@ prepare to call _dl_fixup()
@ change &GOT[n+3] into 8*n NOTE: reloc are 8 bytes each
sub r1, ip, lr
sub r1, r1, #4
add r1, r1, r1
@ call fixup routine
bl _dl_fixup
@ save the return
mov ip, r0
@ get arguments and return address back. We restore r4
@ only to realign the stack.
pop {r0-r4,lr}
cfi_adjust_cfa_offset (-24)
@ jump to the newly found address
BX(ip)
cfi_endproc
.size _dl_runtime_resolve, .-_dl_runtime_resolve
#if !defined PROF && defined SHARED
.globl _dl_runtime_profile
.type _dl_runtime_profile, #function
CFI_SECTIONS
cfi_startproc
.align 2
_dl_runtime_profile:
cfi_adjust_cfa_offset (4)
cfi_rel_offset (lr, 0)
@ we get called with
@ stack[0] contains the return address from this call
@ ip contains &GOT[n+3] (pointer to function)
@ lr points to &GOT[2]
@ Stack layout:
@ 212 - saved lr
@ 208 - framesize returned from pltenter
@ 16 - La_arm_regs
@ 8 - Saved two arguments to _dl_profile_fixup
@ 4 - Saved result of _dl_profile_fixup
@ 0 - outgoing argument to _dl_profile_fixup
@ For now, we only save the general purpose registers.
sub sp, sp, #196
cfi_adjust_cfa_offset (196)
stmia sp, {r0-r3}
cfi_rel_offset (r0, 0)
cfi_rel_offset (r1, 4)
cfi_rel_offset (r2, 8)
cfi_rel_offset (r3, 12)
sub sp, sp, #16
cfi_adjust_cfa_offset (16)
@ Save sp and lr.
add r0, sp, #216
str r0, [sp, #32]
ldr r2, [sp, #212]
str r2, [sp, #36]
@ get pointer to linker struct
ldr r0, [lr, #-4]
@ prepare to call _dl_profile_fixup()
@ change &GOT[n+3] into 8*n NOTE: reloc are 8 bytes each
sub r1, ip, lr
sub r1, r1, #4
add r1, r1, r1
@ Save these two arguments for pltexit.
add r3, sp, #8
stmia r3!, {r0,r1}
@ Set up extra args for _dl_profile_fixup.
@ r2 and r3 are already loaded.
add ip, sp, #208
str ip, [sp, #0]
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