| /* Copyright (C) 2012-2014 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 |
