80 lines
2.3 KiB
ArmAsm
80 lines
2.3 KiB
ArmAsm
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/* PLT trampolines. Nios II version.
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Copyright (C) 2005-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<https://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include <libc-symbols.h>
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.text
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.globl _dl_runtime_resolve
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cfi_startproc
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_dl_runtime_resolve:
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/* The runtime resolver receives the original function arguments in r4
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through r7, the shared library identifier from GOT[1]? in r14, and the
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relocation index times four in r15. It updates the corresponding PLT GOT
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entry so that the PLT entry will transfer control directly to the target
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in the future, and then transfers control to the target. */
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/* Save arguments and return address. */
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subi sp, sp, 28
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cfi_adjust_cfa_offset (28)
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stw r22, 24(sp)
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cfi_rel_offset (r22, 24)
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stw r8, 20(sp) /* save r8, because this might be a call to mcount */
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cfi_rel_offset (r8, 20)
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stw r7, 16(sp)
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cfi_rel_offset (r7, 16)
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stw r6, 12(sp)
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cfi_rel_offset (r6, 12)
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stw r5, 8(sp)
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cfi_rel_offset (r5, 8)
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stw r4, 4(sp)
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cfi_rel_offset (r4, 4)
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stw ra, 0(sp)
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cfi_rel_offset (ra, 0)
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/* Get pointer to linker struct. */
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mov r4, r14
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/* Get the relocation offset. We're given a multiple of 4 and
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need a multiple of 12, so multiply by 3. */
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slli r5, r15, 1
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add r5, r5, r15
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/* Call the fixup routine. */
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nextpc r22
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1: movhi r2, %hiadj(_gp_got - 1b)
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addi r2, r2, %lo(_gp_got - 1b)
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add r22, r22, r2
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ldw r2, %call(_dl_fixup)(r22)
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callr r2
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/* Restore the arguments and return address. */
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ldw ra, 0(sp)
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ldw r4, 4(sp)
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ldw r5, 8(sp)
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ldw r6, 12(sp)
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ldw r7, 16(sp)
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ldw r8, 20(sp)
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ldw r22, 24(sp)
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addi sp, sp, 28
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cfi_adjust_cfa_offset (-28)
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/* Jump to the newly found address. */
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jmp r2
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cfi_endproc
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