Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
Fetching contributors…

Cannot retrieve contributors at this time

67 lines (56 sloc) 2.39 kb
#!/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_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 second parameter, overwriting IMP
movl 0x4(%esp), %ecx
movl %ecx, 0x8(%esp)
// Load the block reference from the config page, insert as the first parameter
movl (%eax), %eax
movl %eax, 0x4(%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
}
Jump to Line
Something went wrong with that request. Please try again.