| /* libunwind - a platform-independent unwind library |
| Copyright (C) 2008 CodeSourcery |
| |
| This file is part of libunwind. |
| |
| Permission is hereby granted, free of charge, to any person obtaining |
| a copy of this software and associated documentation files (the |
| "Software"), to deal in the Software without restriction, including |
| without limitation the rights to use, copy, modify, merge, publish, |
| distribute, sublicense, and/or sell copies of the Software, and to |
| permit persons to whom the Software is furnished to do so, subject to |
| the following conditions: |
| |
| The above copyright notice and this permission notice shall be |
| included in all copies or substantial portions of the Software. |
| |
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE |
| LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION |
| OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION |
| WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ |
| |
| #include "offsets.h" |
| |
| .text |
| .arm |
| |
| .global _Uarm_getcontext |
| .type _Uarm_getcontext, %function |
| @ This is a stub version of getcontext() for ARM which only stores core |
| @ registers. It must be called in a special way, not as a regular |
| @ function -- see also the libunwind-arm.h:unw_tdep_getcontext macro. |
| _Uarm_getcontext: |
| stmfd sp!, {r0, r1} |
| @ store r0 |
| str r0, [r0, #LINUX_UC_MCONTEXT_OFF + LINUX_SC_R0_OFF] |
| add r0, r0, #LINUX_UC_MCONTEXT_OFF + LINUX_SC_R0_OFF |
| @ store r1 to r12 |
| stmib r0, {r1-r12} |
| @ reconstruct r13 at call site, then store |
| add r1, sp, #12 |
| str r1, [r0, #13 * 4] |
| @ retrieve r14 from call site, then store |
| ldr r1, [sp, #8] |
| str r1, [r0, #14 * 4] |
| @ point lr to instruction after call site's stack adjustment |
| add r1, lr, #4 |
| str r1, [r0, #15 * 4] |
| ldmfd sp!, {r0, r1} |
| bx lr |
| #ifdef __linux__ |
| /* We do not need executable stack. */ |
| .section .note.GNU-stack,"",%progbits |
| #endif |