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#!/bin/sh

# -----------------------------------------------------------------------
# Copyright (c) 2010-2011, Plausible Labs Cooperative, Inc.
# All Rights Reserved.
#
# 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.
# -----------------------------------------------------------------------

# Architecture definitions
ARCH="i386"
PAGE_SIZE="4096"

# The name of this page
PAGE_NAME=pl_blockimp_table_stret_page

# Prefix to be placed at the start of the trampoline page
trampoline_prefix () {
asm << 'EOF'
    _block_tramp_dispatch:
        pop %eax
        andl $0xfffffff8, %eax // truncate to the trampoline start (each is 8 bytes)
        subl $0x1000, %eax // load the config location

        // Move 'self' to the third parameter, overwriting IMP
        movl 0x8(%esp), %ecx
        movl %ecx, 0xc(%esp)
        
        // Load the block reference from the config page, insert as the second parameter
        movl (%eax), %eax
        movl %eax, 0x8(%esp)

        // Jump to the block fptr
        jmp *0xc(%eax)

        .align 3 // align the trampolines at 8 bytes
EOF
}

# Generate a single trampoline
trampoline () {
asm << 'EOF'

    # Call into the dispatcher, placing our return address on the stack.
    calll _block_tramp_dispatch # 5 bytes
    .align 3 // align the trampolines at 8 bytes

EOF
}
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