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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
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