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-#!/bin/sh
-
-# -----------------------------------------------------------------------
-# gentramp.sh - Copyright (c) 2010, Plausible Labs Cooperative, Inc.
-#
-# ARM Trampoline Page Generator
-#
-# 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.
-# -----------------------------------------------------------------------
-
-PROGNAME=$0
-
-# Each trampoline is exactly 3 instructions, or 12 bytes. If any of these values change,
-# the entire arm trampoline implementation must be updated to match, too.
-
-# Size of an individual trampoline, in bytes
-TRAMPOLINE_SIZE=12
-
-# Page size, in bytes
-PAGE_SIZE=4096
-
-# Compute the size of the reachable config page; The first 16 bytes of the config page
-# are unreachable due to our maximum pc-relative ldr offset.
-PAGE_AVAIL=`expr $PAGE_SIZE - 16`
-
-# Compute the number of of available trampolines.
-TRAMPOLINE_COUNT=`expr $PAGE_AVAIL / $TRAMPOLINE_SIZE`
-
-header () {
- echo "# GENERATED CODE - DO NOT EDIT"
- echo "# This file was generated by $PROGNAME"
- echo ""
-
- # Write out the license header
-cat << EOF
-# Copyright (c) 2010, Plausible Labs Cooperative, Inc.
-#
-# 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.
-# -----------------------------------------------------------------------
-
-EOF
-
- # Write out the trampoline table, aligned to the page boundary
- echo ".text"
- echo ".align 12"
- echo ".globl _ffi_closure_trampoline_table_page"
- echo "_ffi_closure_trampoline_table_page:"
-}
-
-
-# WARNING - Don't modify the trampoline code size without also updating the relevant libffi code
-trampoline () {
- cat << END
-
- // trampoline
- // Save to stack
- stmfd sp!, {r0-r3}
-
- // Load the context argument from the config page.
- // This places the first usable config value at _ffi_closure_trampoline_table-4080
- // This accounts for the above 4-byte stmfd instruction, plus 8 bytes constant when loading from pc.
- ldr r0, [pc, #-4092]
-
- // Load the jump address from the config page.
- ldr pc, [pc, #-4092]
-
-END
-}
-
-main () {
- # Write out the header
- header
-
- # Write out the trampolines
- local i=0
- while [ $i -lt ${TRAMPOLINE_COUNT} ]; do
- trampoline
- local i=`expr $i + 1`
- done
-}
-
-main