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authorJari Vetoniemi <jari.vetoniemi@indooratlas.com>2020-03-16 18:49:26 +0900
committerJari Vetoniemi <jari.vetoniemi@indooratlas.com>2020-03-30 00:39:06 +0900
commitfcbf63e62c627deae76c1b8cb8c0876c536ed811 (patch)
tree64cb17de3f41a2b6fef2368028fbd00349946994 /jni/ruby/ext/fiddle/libffi-3.2.1/src/arm/gentramp.sh
Fresh start
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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