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c6bfe5c4d7
I've moved the ARM port from ports to the main sysdeps hierarchy. Beyond the README update, the move of the files was simply git mv ports/sysdeps/arm sysdeps/arm git mv ports/sysdeps/unix/arm sysdeps/unix/arm git mv ports/sysdeps/unix/sysv/linux/arm sysdeps/unix/sysv/linux/arm and in addition to the ChangeLog entries here, I put a note at the top of ports/ChangeLog.arm similar to that at the top of ChangeLog.powerpc. There is deliberately no NEWS change, as I think it makes the most sense to put in a general note above all ports having moved if we can achieve that for 2.20. Tested that disassembly of installed shared libraries for arm is the same before and after this patch, except for data (not instructions) in ld.so (there are assertions in sysdeps/arm/dl-machine.h, and the path by which that file is found, and so by which it appears in the assertion message, changes as a result of the move). * sysdeps/arm: Move directory from ports/sysdeps/arm. * sysdeps/unix/arm: Move directory from ports/sysdeps/unix/arm. * sysdeps/unix/sysv/linux/arm: Move directory from ports/sysdeps/unix/sysv/linux/arm. * README: Update listing for arm-*-linux-gnueabi. ports/ChangeLog.arm: * sysdeps/arm: Move directory to ../sysdeps/arm. * sysdeps/unix/arm: Move directory to ../sysdeps.arm. * sysdeps/unix/sysv/linux/arm: Move directory to ../sysdeps/unix/sysv/linux/arm.
213 lines
4.7 KiB
ArmAsm
213 lines
4.7 KiB
ArmAsm
/* PLT trampolines. ARM version.
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Copyright (C) 2005-2014 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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<http://www.gnu.org/licenses/>. */
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/* ??? Needs more rearrangement for the LDM to handle thumb mode. */
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#define NO_THUMB
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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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.type _dl_runtime_resolve, #function
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CFI_SECTIONS
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cfi_startproc
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.align 2
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_dl_runtime_resolve:
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cfi_adjust_cfa_offset (4)
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cfi_rel_offset (lr, 0)
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@ we get called with
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@ stack[0] contains the return address from this call
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@ ip contains &GOT[n+3] (pointer to function)
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@ lr points to &GOT[2]
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@ Save arguments. We save r4 to realign the stack.
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push {r0-r4}
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cfi_adjust_cfa_offset (20)
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cfi_rel_offset (r0, 0)
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cfi_rel_offset (r1, 4)
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cfi_rel_offset (r2, 8)
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cfi_rel_offset (r3, 12)
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@ get pointer to linker struct
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ldr r0, [lr, #-4]
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@ prepare to call _dl_fixup()
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@ change &GOT[n+3] into 8*n NOTE: reloc are 8 bytes each
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sub r1, ip, lr
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sub r1, r1, #4
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add r1, r1, r1
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@ call fixup routine
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bl _dl_fixup
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@ save the return
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mov ip, r0
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@ get arguments and return address back. We restore r4
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@ only to realign the stack.
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pop {r0-r4,lr}
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cfi_adjust_cfa_offset (-24)
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@ jump to the newly found address
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BX(ip)
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cfi_endproc
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.size _dl_runtime_resolve, .-_dl_runtime_resolve
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#ifndef PROF
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.globl _dl_runtime_profile
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.type _dl_runtime_profile, #function
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CFI_SECTIONS
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cfi_startproc
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.align 2
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_dl_runtime_profile:
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cfi_adjust_cfa_offset (4)
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cfi_rel_offset (lr, 0)
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@ we get called with
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@ stack[0] contains the return address from this call
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@ ip contains &GOT[n+3] (pointer to function)
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@ lr points to &GOT[2]
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@ Stack layout:
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@ 212 - saved lr
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@ 208 - framesize returned from pltenter
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@ 16 - La_arm_regs
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@ 8 - Saved two arguments to _dl_profile_fixup
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@ 4 - Saved result of _dl_profile_fixup
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@ 0 - outgoing argument to _dl_profile_fixup
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@ For now, we only save the general purpose registers.
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sub sp, sp, #196
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cfi_adjust_cfa_offset (196)
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stmia sp, {r0-r3}
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cfi_rel_offset (r0, 0)
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cfi_rel_offset (r1, 4)
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cfi_rel_offset (r2, 8)
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cfi_rel_offset (r3, 12)
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sub sp, sp, #16
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cfi_adjust_cfa_offset (16)
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@ Save sp and lr.
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add r0, sp, #216
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str r0, [sp, #32]
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ldr r2, [sp, #212]
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str r2, [sp, #36]
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@ get pointer to linker struct
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ldr r0, [lr, #-4]
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@ prepare to call _dl_profile_fixup()
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@ change &GOT[n+3] into 8*n NOTE: reloc are 8 bytes each
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sub r1, ip, lr
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sub r1, r1, #4
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add r1, r1, r1
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@ Save these two arguments for pltexit.
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add r3, sp, #8
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stmia r3!, {r0,r1}
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@ Set up extra args for _dl_profile_fixup.
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@ r2 and r3 are already loaded.
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add ip, sp, #208
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str ip, [sp, #0]
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@ call profiling fixup routine
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bl _dl_profile_fixup
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@ The address to call is now in r0.
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@ Check whether we're wrapping this function.
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ldr ip, [sp, #208]
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cmp ip, #0
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bge 1f
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cfi_remember_state
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@ save the return
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mov ip, r0
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@ get arguments and return address back
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add sp, sp, #16
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cfi_adjust_cfa_offset (-16)
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ldmia sp, {r0-r3,sp,lr}
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cfi_adjust_cfa_offset (-200)
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@ jump to the newly found address
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BX(ip)
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cfi_restore_state
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1:
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@ The new frame size is in ip.
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@ New stack layout:
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@ 268 - saved r7
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@ 264 - saved result of _dl_profile_fixup
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@ 72 - La_arm_regs
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@ 64 - Saved two arguments to _dl_profile_fixup
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@ 0 - La_arm_retval
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@ For now, we only save the general purpose registers.
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@ Build the new frame.
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str r7, [sp, #212]
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cfi_rel_offset (r7, 212)
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sub r7, sp, #56
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cfi_def_cfa_register (r7)
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cfi_adjust_cfa_offset (56)
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sub sp, sp, ip
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bic sp, sp, #7
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@ Save the _dl_profile_fixup result around the call to memcpy.
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str r0, [r7, #264]
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@ Copy the stack arguments.
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mov r0, sp
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add r1, r7, #272
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mov r2, ip
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bl memcpy
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@ Call the function.
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add ip, r7, #72
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ldmia ip, {r0-r3}
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ldr ip, [r7, #264]
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BLX(ip)
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stmia r7, {r0-r3}
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@ Call pltexit.
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add ip, r7, #64
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ldmia ip, {r0,r1}
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add r2, r7, #72
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add r3, r7, #0
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bl _dl_call_pltexit
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@ Return to caller.
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ldmia r7, {r0-r3}
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mov sp, r7
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cfi_def_cfa_register (sp)
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ldr r7, [sp, #268]
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ldr lr, [sp, #92]
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add sp, sp, #272
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cfi_adjust_cfa_offset (-272)
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BX(lr)
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cfi_endproc
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.size _dl_runtime_profile, .-_dl_runtime_profile
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#endif
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.previous
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