mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-16 10:00:12 +00:00
112 lines
3.1 KiB
ArmAsm
112 lines
3.1 KiB
ArmAsm
/* Copyright (C) 2012-2017 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
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
/* ??? Needs more rearrangement for the LDM to handle thumb mode. */
|
|
#define NO_THUMB
|
|
#include <sysdep.h>
|
|
#include <rtld-global-offsets.h>
|
|
|
|
#include "ucontext_i.h"
|
|
|
|
.syntax unified
|
|
.text
|
|
|
|
/* int setcontext (const ucontext_t *ucp) */
|
|
|
|
ENTRY(__setcontext)
|
|
mov r4, r0
|
|
add r0, r0, #UCONTEXT_REGSPACE
|
|
|
|
/* Restore the VFP registers. Copied from arm/__longjmp.S. */
|
|
#ifdef PIC
|
|
ldr r2, 1f
|
|
ldr r1, .Lrtld_global_ro
|
|
0: add r2, pc, r2
|
|
ldr r2, [r2, r1]
|
|
ldr r2, [r2, #RTLD_GLOBAL_RO_DL_HWCAP_OFFSET]
|
|
#else
|
|
ldr r2, .Lhwcap
|
|
ldr r2, [r2, #0]
|
|
#endif
|
|
|
|
#ifdef __SOFTFP__
|
|
tst r2, #HWCAP_ARM_VFP
|
|
beq .Lno_vfp_sc
|
|
#endif
|
|
|
|
/* Following instruction is vldmia r0!, {d8-d15}. */
|
|
ldc p11, cr8, [r0], #64
|
|
/* Restore the floating-point status register. */
|
|
ldr r1, [r0], #4
|
|
/* Following instruction is fmxr fpscr, r1. */
|
|
mcr p10, 7, r1, cr1, cr0, 0
|
|
.Lno_vfp_sc:
|
|
tst r2, #HWCAP_ARM_IWMMXT
|
|
beq .Lno_iwmmxt_sc
|
|
|
|
/* Restore the call-preserved iWMMXt registers. */
|
|
/* Following instructions are wldrd wr10, [r0], #8 (etc.) */
|
|
ldcl p1, cr10, [r0], #8
|
|
ldcl p1, cr11, [r0], #8
|
|
ldcl p1, cr12, [r0], #8
|
|
ldcl p1, cr13, [r0], #8
|
|
ldcl p1, cr14, [r0], #8
|
|
ldcl p1, cr15, [r0], #8
|
|
.Lno_iwmmxt_sc:
|
|
|
|
/* Now bring back the signal status. */
|
|
mov r0, #SIG_SETMASK
|
|
add r1, r4, #UCONTEXT_SIGMASK
|
|
mov r2, #0
|
|
bl PLTJMP(__sigprocmask)
|
|
|
|
/* Loading r0-r3 makes makecontext easier. */
|
|
add r14, r4, #MCONTEXT_ARM_R0
|
|
ldmia r14, {r0-r12}
|
|
ldr r13, [r14, #(MCONTEXT_ARM_SP - MCONTEXT_ARM_R0)]
|
|
add r14, r14, #(MCONTEXT_ARM_LR - MCONTEXT_ARM_R0)
|
|
ldmia r14, {r14, pc}
|
|
|
|
END(setcontext)
|
|
weak_alias(__setcontext, setcontext)
|
|
|
|
/* Called when a makecontext() context returns. Start the
|
|
context in R4 or fall through to exit(). */
|
|
/* Unwind descriptors are looked up based on PC - 2, so we have to
|
|
make sure to mark the instruction preceding the __startcontext
|
|
label as .cantunwind. */
|
|
.fnstart
|
|
.cantunwind
|
|
nop
|
|
ENTRY(__startcontext)
|
|
movs r0, r4
|
|
bne PLTJMP(__setcontext)
|
|
|
|
@ New context was 0 - exit
|
|
b PLTJMP(HIDDEN_JUMPTARGET(exit))
|
|
.fnend
|
|
END(__startcontext)
|
|
|
|
#ifdef PIC
|
|
1: .long _GLOBAL_OFFSET_TABLE_ - 0b - PC_OFS
|
|
.Lrtld_global_ro:
|
|
.long C_SYMBOL_NAME(_rtld_global_ro)(GOT)
|
|
#else
|
|
.Lhwcap:
|
|
.long C_SYMBOL_NAME(_dl_hwcap)
|
|
#endif
|