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