130 lines
2.7 KiB
ArmAsm
130 lines
2.7 KiB
ArmAsm
/* libgcc routines for RL78
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Copyright (C) 2011-2020 Free Software Foundation, Inc.
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Contributed by Red Hat.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published
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by the Free Software Foundation; either version 3, or (at your
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option) any later version.
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GCC is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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/* RL78 Trampoline support
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Since the RL78's RAM is not in the first 64k, we cannot "just" use a
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function pointer to point to a trampoline on the stack. So, we
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create N fixed trampolines that read from an array, and allocate
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them as needed.
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*/
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#include "vregs.h"
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.data
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.p2align 1
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trampoline_array:
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.macro stub n
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.text
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trampoline_\n:
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.type trampoline_\n, @function
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movw ax, !trampoline_chain_\n
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movw r14, ax
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movw ax, !trampoline_addr_\n
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br ax
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.size trampoline_\n, .-trampoline_\n
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.data
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trampoline_frame_\n:
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.short 0
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trampoline_stub_\n:
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.short trampoline_\n
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trampoline_chain_\n:
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.short 0
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trampoline_addr_\n:
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.short 0
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#define TO_FRAME 0
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#define TO_STUB 2
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#define TO_CHAIN 4
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#define TO_ADDR 6
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#define TO_SIZE 8
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.endm
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stub 0
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stub 1
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stub 2
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stub 3
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stub 4
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stub 5
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trampoline_array_end:
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/* Given the function pointer in R8 and the static chain
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pointer in R10, allocate a trampoline and return its address in
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R8. */
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START_FUNC ___trampoline_init
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movw hl, #trampoline_array
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1: movw ax, [hl + TO_ADDR]
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cmpw ax, #0
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bz $2f
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movw ax, hl
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addw ax, #TO_SIZE
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movw hl, ax
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cmpw ax, #trampoline_array_end
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bnz $1b
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brk ; no more slots?
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2: movw ax, r8
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movw [hl + TO_ADDR], ax
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movw ax, r10
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movw [hl + TO_CHAIN], ax
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movw ax, sp
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movw [hl + TO_FRAME], ax
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movw ax, [hl + TO_STUB]
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movw r8, ax
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ret
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END_FUNC ___trampoline_init
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START_FUNC ___trampoline_uninit
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movw hl, #trampoline_array
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movw ax, sp
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movw bc, ax
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1: movw ax, [hl + TO_FRAME]
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cmpw ax, bc
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bc $2f
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clrw ax
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movw [hl + TO_ADDR], ax
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2: movw ax, hl
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addw ax, #TO_SIZE
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movw hl, ax
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cmpw ax, #trampoline_array_end
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bnz $1b
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ret
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END_FUNC ___trampoline_uninit
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