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| /* 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
|
|
