| /* 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/>. */ |
| |
| #include <sysdep.h> |
| #include <rtld-global-offsets.h> |
| |
| #include "ucontext_i.h" |
| |
| .syntax unified |
| .text |
| |
| /* int getcontext (ucontext_t *ucp) */ |
| |
| ENTRY(__getcontext) |
| /* No need to save r0-r3, d0-d7, or d16-d31. */ |
| add r1, r0, #MCONTEXT_ARM_R4 |
| stmia r1, {r4-r11} |
| |
| /* Save R13 separately as Thumb can't STM it. */ |
| str r13, [r0, #MCONTEXT_ARM_SP] |
| str r14, [r0, #MCONTEXT_ARM_LR] |
| /* Return to LR */ |
| str r14, [r0, #MCONTEXT_ARM_PC] |
| /* Return zero */ |
| mov r2, #0 |
| str r2, [r0, #MCONTEXT_ARM_R0] |
| |
| /* Save ucontext_t * across the next call. */ |
| mov r4, r0 |
| |
| /* __sigprocmask(SIG_BLOCK, NULL, &(ucontext->uc_sigmask)) */ |
| mov r0, #SIG_BLOCK |
| mov r1, #0 |
| add r2, r4, #UCONTEXT_SIGMASK |
| bl PLTJMP(__sigprocmask) |
| |
| /* Store FP regs. Much of the FP code is copied from arm/setjmp.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 |
| |
| add r0, r4, #UCONTEXT_REGSPACE |
| |
| #ifdef __SOFTFP__ |
| tst r2, #HWCAP_ARM_VFP |
| beq .Lno_vfp |
| #endif |
| |
| /* Store the VFP registers. |
| Don't use VFP instructions directly because this code |
| is used in non-VFP multilibs. */ |
| /* Following instruction is vstmia r0!, {d8-d15}. */ |
| stc p11, cr8, [r0], #64 |
| /* Store the floating-point status register. */ |
| /* Following instruction is vmrs r1, fpscr. */ |
| mrc p10, 7, r1, cr1, cr0, 0 |
| str r1, [r0], #4 |
| .Lno_vfp: |
| |
| tst r2, #HWCAP_ARM_IWMMXT |
| beq .Lno_iwmmxt |
| |
| /* Save the call-preserved iWMMXt registers. */ |
| /* Following instructions are wstrd wr10, [r0], #8 (etc.) */ |
| stcl p1, cr10, [r0], #8 |
| stcl p1, cr11, [r0], #8 |
| stcl p1, cr12, [r0], #8 |
| stcl p1, cr13, [r0], #8 |
| stcl p1, cr14, [r0], #8 |
| stcl p1, cr15, [r0], #8 |
| .Lno_iwmmxt: |
| |
| /* Restore the clobbered R4 and LR. */ |
| ldr r14, [r4, #MCONTEXT_ARM_LR] |
| ldr r4, [r4, #MCONTEXT_ARM_R4] |
| |
| mov r0, #0 |
| |
| DO_RET(r14) |
| |
| END(__getcontext) |
| |
| #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 |
| |
| |
| weak_alias(__getcontext, getcontext) |
