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112 lines
3.1 KiB
ArmAsm
112 lines
3.1 KiB
ArmAsm
/* Copyright (C) 2012-2020 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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/* ??? 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 <rtld-global-offsets.h>
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#include "ucontext_i.h"
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.syntax unified
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.text
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/* int setcontext (const ucontext_t *ucp) */
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ENTRY(__setcontext)
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mov r4, r0
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add r0, r0, #UCONTEXT_REGSPACE
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/* Restore the VFP registers. Copied from arm/__longjmp.S. */
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#ifdef PIC
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ldr r2, 1f
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ldr r1, .Lrtld_global_ro
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0: add r2, pc, r2
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ldr r2, [r2, r1]
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ldr r2, [r2, #RTLD_GLOBAL_RO_DL_HWCAP_OFFSET]
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#else
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ldr r2, .Lhwcap
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ldr r2, [r2, #0]
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#endif
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#ifdef __SOFTFP__
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tst r2, #HWCAP_ARM_VFP
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beq .Lno_vfp_sc
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#endif
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/* Following instruction is vldmia r0!, {d8-d15}. */
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ldc p11, cr8, [r0], #64
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/* Restore the floating-point status register. */
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ldr r1, [r0], #4
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/* Following instruction is fmxr fpscr, r1. */
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mcr p10, 7, r1, cr1, cr0, 0
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.Lno_vfp_sc:
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tst r2, #HWCAP_ARM_IWMMXT
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beq .Lno_iwmmxt_sc
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/* Restore the call-preserved iWMMXt registers. */
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/* Following instructions are wldrd wr10, [r0], #8 (etc.) */
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ldcl p1, cr10, [r0], #8
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ldcl p1, cr11, [r0], #8
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ldcl p1, cr12, [r0], #8
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ldcl p1, cr13, [r0], #8
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ldcl p1, cr14, [r0], #8
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ldcl p1, cr15, [r0], #8
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.Lno_iwmmxt_sc:
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/* Now bring back the signal status. */
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mov r0, #SIG_SETMASK
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add r1, r4, #UCONTEXT_SIGMASK
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mov r2, #0
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bl PLTJMP(__sigprocmask)
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/* Loading r0-r3 makes makecontext easier. */
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add r14, r4, #MCONTEXT_ARM_R0
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ldmia r14, {r0-r12}
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ldr r13, [r14, #(MCONTEXT_ARM_SP - MCONTEXT_ARM_R0)]
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add r14, r14, #(MCONTEXT_ARM_LR - MCONTEXT_ARM_R0)
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ldmia r14, {r14, pc}
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END(setcontext)
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weak_alias(__setcontext, setcontext)
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/* Called when a makecontext() context returns. Start the
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context in R4 or fall through to exit(). */
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/* Unwind descriptors are looked up based on PC - 2, so we have to
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make sure to mark the instruction preceding the __startcontext
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label as .cantunwind. */
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.fnstart
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.cantunwind
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nop
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ENTRY(__startcontext)
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movs r0, r4
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bne PLTJMP(__setcontext)
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@ New context was 0 - exit
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b PLTJMP(HIDDEN_JUMPTARGET(exit))
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.fnend
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END(__startcontext)
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#ifdef PIC
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1: .long _GLOBAL_OFFSET_TABLE_ - 0b - PC_OFS
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.Lrtld_global_ro:
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.long C_SYMBOL_NAME(_rtld_global_ro)(GOT)
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#else
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.Lhwcap:
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.long C_SYMBOL_NAME(_dl_hwcap)
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#endif
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