68 lines
1.8 KiB
ArmAsm
68 lines
1.8 KiB
ArmAsm
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/* Implementation of profiling support. C-SKY ABIV2 version.
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Copyright (C) 2018-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<https://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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/* Use an assembly stub with a special ABI. The calling lr has been
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pushed to the stack (which will be misaligned). We should preserve
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all registers except ip and pop a word off the stack.
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NOTE: This assumes mcount_internal does not clobber any non-core
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(coprocessor) registers. Currently this is true, but may require
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additional attention in the future.
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The calling sequence looks something like:
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func:
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push lr
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jbsr _mount
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<function body>
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*/
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/* Don't call mcount when calling mcount... */
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#undef PROF
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ENTRY (_mcount)
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subi sp, 20
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stw a0, (sp, 0)
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stw a1, (sp, 4)
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stw a2, (sp, 8)
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stw a3, (sp, 12)
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stw lr, (sp, 16)
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mov a1, lr
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ldw a0, (sp, 20)
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#ifdef __PIC__
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grs t1, .Lgetpc
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.Lgetpc:
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lrw t0, .Lgetpc@GOTPC
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addu t1, t0
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lrw t0, __mcount_internal@PLT
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ldr.w t0, (t1, t0 << 0)
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jsr t0
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#else
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jsri __mcount_internal
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#endif /* !__PIC__ */
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ldw a0, (sp, 0)
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ldw a1, (sp, 4)
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ldw a2, (sp, 8)
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ldw a3, (sp, 12)
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ldw t1, (sp, 16)
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ldw lr, (sp, 20)
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addi sp, 24
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jmp t1
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END (_mcount)
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