From 402fadd089a83ccad4290012f38ed6dbc7b35317 Mon Sep 17 00:00:00 2001 From: christoph Date: Mon, 26 Dec 2011 22:45:22 +0100 Subject: [PATCH 1/1] First Patch --- COPYING.AGPL.Mulklib | 661 ++++++++++++++++++++++++++++++++++++++ README | 2 + bitmapped_patricia_tree.c | 471 +++++++++++++++++++++++++++ bitmapped_patricia_tree.h | 69 ++++ withAsm.c | 32 ++ withMulklib.c | 233 ++++++++++++++ withUdis.c | 135 ++++++++ 7 files changed, 1603 insertions(+) create mode 100644 COPYING.AGPL.Mulklib create mode 100644 README create mode 100644 bitmapped_patricia_tree.c create mode 100644 bitmapped_patricia_tree.h create mode 100644 withAsm.c create mode 100644 withMulklib.c create mode 100644 withUdis.c diff --git a/COPYING.AGPL.Mulklib b/COPYING.AGPL.Mulklib new file mode 100644 index 0000000..dba13ed --- /dev/null +++ b/COPYING.AGPL.Mulklib @@ -0,0 +1,661 @@ + GNU AFFERO GENERAL PUBLIC LICENSE + Version 3, 19 November 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU Affero General Public License is a free, copyleft license for +software and other kinds of works, specifically designed to ensure +cooperation with the community in the case of network server software. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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There are many ways you could offer source, and different +solutions will be better for different programs; see section 13 for the +specific requirements. + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU AGPL, see +. diff --git a/README b/README new file mode 100644 index 0000000..53233e7 --- /dev/null +++ b/README @@ -0,0 +1,2 @@ +Lazy Evaluation in C. + diff --git a/bitmapped_patricia_tree.c b/bitmapped_patricia_tree.c new file mode 100644 index 0000000..bebc2c5 --- /dev/null +++ b/bitmapped_patricia_tree.c @@ -0,0 +1,471 @@ +// -*- mode: c; coding: utf-8 -*- */ +// +// Copyright 2010, 2011, Matthias Andreas Benkard. +// +//----------------------------------------------------------------------------- +// This program is free software: you can redistribute it and/or modify +// it under the terms of the GNU Affero General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Affero General Public License for more details. +// +// You should have received a copy of the GNU Affero General Public License +// along with this program. If not, see . +//----------------------------------------------------------------------------- +// + +// An implementation of a bitmapped Patricia tree. + +//// Purpose //// +// +// The idea is to use a locally mutable, bitmapped Patricia tree as a +// variable binding store (i.e. environment) in compiled code. In this +// way, there is no need for excessive copying when an independent +// environment must be set up (such as when initiating the processing of +// a new node in the search space). Instead, significant amounts of +// structure can be shared between child and parent environments. + +//// Motivation //// +// +// 1. Patricia trees are very amenable to structure sharing. +// +// 2. Furthermore, big-endian Patricia trees are especially efficient +// when indices are allocated sequentially, as is the case for +// variables in code emitted by our compiler. +// +// 3. Finally, bitmapping improves the performance of copying because +// copying an array is much cheaper than copying an equivalent branch +// in a tree. As we need to shallow-copy the tree at potentially +// each choice point, copying needs to be fast. + + +#include +#include +#include + +#include "bitmapped_patricia_tree.h" + +typedef struct bpt_nonempty *bpt_nonempty_t; +typedef struct bpt_node *bpt_node_t; +typedef struct bpt_leaf *bpt_leaf_t; + +struct bpt { + enum bpt_tag tag; + int refcount; + bool mutable; + bpt_key_t prefix; +}; + +struct bpt_leaf { + struct bpt bpt; // poor man's inheritance + void *value; +#ifdef BPT_ENABLE_DEALLOC_HOOKS + void (*dealloc_hook)(bpt_key_t, void *); // not actually used anywhere in client code +#endif +}; + +struct bpt_node { + struct bpt bpt; // poor man's inheritance + unsigned int branching_chunk; + bpt_key_bitmask_t bitmask; + bpt_t *children; +}; + + +void init_bpt_leaf(bpt_t a_leaf, bpt_key_t key, void *value) { + bpt_leaf_t leaf = (bpt_leaf_t)a_leaf; + leaf->bpt.tag = BPT_LEAF; + leaf->bpt.mutable = true; + leaf->bpt.prefix = key; + leaf->value = value; +#ifdef BPT_ENABLE_DEALLOC_HOOKS + leaf->dealloc_hook = NULL; +#endif + leaf->bpt.refcount = 1; +} + +void init_bpt_node(bpt_node_t node, bpt_key_t prefix, unsigned int branching_chunk) { + node->bpt.tag = BPT_INNER_NODE; + node->bpt.mutable = true; + node->bpt.prefix = prefix; + node->branching_chunk = branching_chunk; + node->bitmask = 0; + node->children = NULL; + node->bpt.refcount = 1; +} + + +bpt_t bpt_make_leaf(bpt_key_t key, void *value) { + bpt_leaf_t leaf = malloc(sizeof *leaf); + init_bpt_leaf((bpt_t)leaf, key, value); + return (bpt_t)leaf; +} + +bpt_node_t bpt_make_node(bpt_key_t prefix, unsigned int branching_chunk) { + bpt_node_t node = malloc(sizeof *node); + init_bpt_node(node, prefix, branching_chunk); + return node; +} + + +static inline unsigned int bpt_number_of_leading_zeros(bpt_key_t x); +static inline unsigned int bpt_number_of_trailing_zeros(bpt_key_t x); +static inline unsigned int bpt_popcount(bpt_key_bitmask_t key); +static unsigned int bpt_compute_child_index(bpt_key_bitmask_t bitmask, unsigned int child_number); +static inline uint_fast8_t bpt_offset_of_key(bpt_key_t key, unsigned int branching_chunk); +static bpt_key_t bpt_prefix_of_key(bpt_key_t key, unsigned int branching_chunk); +static inline unsigned int bpt_branching_chunk(bpt_t bpt); +static unsigned int bpt_find_diverging_chunk(bpt_key_t key1, bpt_key_t key2); +static void bpt_for_children(bpt_t bpt, void (*thunk)(bpt_t)); + + +static void bpt_for_children(bpt_t bpt, void (*thunk)(bpt_t)) { + if (bpt && bpt->tag == BPT_INNER_NODE) { + bpt_node_t b = (bpt_node_t)bpt; + bpt_t *iter = b->children; + bpt_t *children_end = b->children + bpt_popcount(b->bitmask); + while (iter < children_end) { + thunk(*iter); + iter++; + } + } +} + +void *bpt_get(bpt_t bpt, bpt_key_t key) { + void **pointer = bpt_get_pointer(bpt, key); + if (pointer) { + return *pointer; + } else { + return NULL; + } +} + +bpt_leaf_t bpt_get_leaf(bpt_t bpt, bpt_key_t key) +{ + if (!bpt) { + return NULL; + } else if (bpt->tag == BPT_LEAF) { + bpt_leaf_t b = (bpt_leaf_t)bpt; + if (bpt->prefix == key) { + return b; + } else { + return NULL; + } + } else { + bpt_node_t b = (bpt_node_t)bpt; + int child_number = bpt_offset_of_key(key, b->branching_chunk); + if ((1 << child_number) & b->bitmask) { + int child_index = bpt_compute_child_index(b->bitmask, child_number); + return bpt_get_leaf(b->children[child_index], key); + } else { + return NULL; + } + } +} + +void **bpt_get_pointer(bpt_t bpt, bpt_key_t key) +{ + bpt_leaf_t leaf = bpt_get_leaf(bpt, key); + if (!leaf) { + return NULL; + } else { + return &leaf->value; + } +} + +bool bpt_has_key(bpt_t bpt, bpt_key_t key) { + return (bpt_get_leaf(bpt, key) != NULL); +} + +bpt_t bpt_assoc(bpt_t bpt, bpt_key_t key, void *value) { + if (!bpt) { + return (bpt_t)bpt_make_leaf(key, value); + } else { + bpt_key_t prefix = bpt->prefix; + if (bpt_prefix_of_key(key, bpt_branching_chunk(bpt)) != prefix) { + unsigned int diverging_chunk = bpt_find_diverging_chunk(key, prefix); + bpt_key_t my_number_in_parent = bpt_offset_of_key(prefix, diverging_chunk); + bpt_key_t their_number_in_parent = bpt_offset_of_key(key, diverging_chunk); + bpt_node_t new_node = bpt_make_node(bpt_prefix_of_key(prefix, diverging_chunk), diverging_chunk); + new_node->bitmask = (1 << my_number_in_parent) | (1 << their_number_in_parent); + new_node->children = malloc(sizeof (*new_node->children) * 2); + if (my_number_in_parent < their_number_in_parent) { + new_node->children[0] = bpt; + new_node->children[1] = bpt_make_leaf(key, value); + } else { + new_node->children[0] = bpt_make_leaf(key, value); + new_node->children[1] = bpt; + } + bpt_retain(bpt); + return (bpt_t)new_node; + } else { + if (bpt->tag == BPT_LEAF) { + bpt_leaf_t b = (bpt_leaf_t)bpt; + if (bpt->mutable) { + b->value = value; + bpt_retain(bpt); + return bpt; + } else { + return (bpt_t)bpt_make_leaf(key, value); + } + } else { + bpt_node_t b = (bpt_node_t)bpt; + uint_fast8_t child_number = bpt_offset_of_key(key, b->branching_chunk); + unsigned int child_index = bpt_compute_child_index(b->bitmask, child_number); + if ((1 << child_number) & b->bitmask) { + // We already have a child to pass the value to. Do that. + bpt_t child = b->children[child_index]; + bpt_t new_child = bpt_assoc(child, key, value); + if (new_child == child) { + bpt_release(child); + bpt_retain(bpt); + return bpt; + } else { + if (bpt->mutable) { + bpt_release(child); + b->children[child_index] = new_child; + bpt_retain(bpt); + return bpt; + } else { + bpt_node_t new_node = malloc(sizeof *new_node); + *new_node = *b; + new_node->bpt.refcount = 1; + new_node->bpt.mutable = true; + unsigned int number_of_children = bpt_popcount(b->bitmask); + size_t size_of_child_array = sizeof (*new_node->children) * number_of_children; + new_node->children = malloc(size_of_child_array); + memcpy(new_node->children, b->children, size_of_child_array); + new_node->children[child_index] = new_child; + // Retain the children copied into the new node. + bpt_for_children((bpt_t)new_node, bpt_retain); + bpt_release(new_child); + return (bpt_t)new_node; + } + } + } else { + // Create a new child. + unsigned int number_of_children = bpt_popcount(b->bitmask); + size_t new_size_of_child_array = sizeof (*b->children) * (number_of_children + 1); + if (bpt->mutable) { + b->children = realloc(b->children, new_size_of_child_array); + memmove(b->children + child_index + 1, b->children + child_index, sizeof (*b->children) * (number_of_children - child_index)); + b->children[child_index] = bpt_make_leaf(key, value); + b->bitmask |= 1 << child_number; + bpt_retain(bpt); + return bpt; + } else { + bpt_t *new_children = malloc(new_size_of_child_array); + memcpy(new_children, b->children, sizeof (*b->children) * child_index); + memcpy(new_children + child_index + 1, + b->children + child_index, + sizeof (*b->children) * (number_of_children - child_index)); + new_children[child_index] = bpt_make_leaf(key, value); + bpt_node_t new_node = bpt_make_node(b->bpt.prefix, b->branching_chunk); + new_node->children = new_children; + new_node->bitmask = b->bitmask | (1 << child_number); + // Retain the children copied into the new node. + bpt_for_children(bpt, bpt_retain); + return (bpt_t)new_node; + } + } + } + } + } +} + + +bpt_t bpt_dissoc(bpt_t bpt, bpt_key_t key) { + if (!bpt || (bpt_prefix_of_key(key, bpt_branching_chunk(bpt)) != bpt->prefix)) { + bpt_retain(bpt); + return bpt; + } else if (bpt->tag == BPT_LEAF) { + // Key matches. + return NULL; + } else { + // Prefix matches. + bpt_node_t b = (bpt_node_t)bpt; + uint_fast8_t child_number = bpt_offset_of_key(key, b->branching_chunk); + if ((1 << child_number) & b->bitmask) { + unsigned int child_index = bpt_compute_child_index(b->bitmask, child_number); + bpt_t child = b->children[child_index]; + bpt_t new_child = bpt_dissoc(child, key); + if (new_child == child) { + bpt_release(child); + bpt_retain(bpt); + return bpt; + } else { + unsigned int number_of_children = bpt_popcount(b->bitmask); + if (!new_child && number_of_children == 2) { + // When there is only a single child left, we replace ourselves + // with that child. + bpt_t remaining_child = b->children[1-child_index]; + bpt_retain(remaining_child); + return remaining_child; + } else if (bpt->mutable) { + bpt_release(child); + if (!new_child) { + // We don't reallocate the array because it wouldn't really + // gain us anything (except maybe non-confusion of a + // conservative GC). + memmove(b->children + child_index, b->children + child_index + 1, sizeof(*b->children) * (number_of_children - child_index - 1)); + b->bitmask &= ~(1 << child_number); + bpt_retain(bpt); + return bpt; + } else { + b->children[child_index] = new_child; + bpt_retain(bpt); + return bpt; + } + } else { + // If all else fails, allocate a new node. + bpt_t *new_children; + bpt_key_bitmask_t bitmask; + if (!new_child) { + new_children = malloc((sizeof *new_children) * (number_of_children - 1)); + memcpy(new_children, b->children, sizeof (*b->children) * child_index); + memcpy(new_children + child_index, + b->children + child_index + 1, + sizeof (*b->children) * (number_of_children - child_index - 1)); + bitmask = b->bitmask & ~(1 << child_number); + } else { + new_children = malloc((sizeof *new_children) * number_of_children); + memcpy(new_children, b->children, sizeof (*b->children) * number_of_children); + new_children[child_index] = new_child; + bitmask = b->bitmask; + } + bpt_node_t new_node = bpt_make_node(b->bpt.prefix, b->branching_chunk); + new_node->children = new_children; + new_node->bitmask = bitmask; + // Retain the children copied into the new node. + bpt_for_children((bpt_t)new_node, bpt_retain); + bpt_release(new_child); + return (bpt_t)new_node; + } + } + } else { + bpt_retain(bpt); + return bpt; + } + } +} + + +void bpt_seal(bpt_t bpt) { + if (bpt) { + if (bpt->mutable) { + bpt->mutable = false; + if (bpt->tag == BPT_INNER_NODE) { + bpt_for_children(bpt, bpt_seal); + } + } + } +} + + +/////////////// Helper functions /////////////// +static unsigned int bpt_compute_child_index(bpt_key_bitmask_t bitmask, unsigned int child_number) { + // Compute the sparse array index given a flat array index. + return bpt_popcount(bitmask & ((1 << child_number) - 1)); +} + +static inline uint_fast8_t bpt_offset_of_key(bpt_key_t key, unsigned int chunk_number) { + // Little-enidan: + //return (key >> (chunk_number * CHUNK_LENGTH)) & OFFSET_MASK; + // Big-endian: + int shift = 0; + if (chunk_number <= MAX_CHUNKS - 2) { + shift += LAST_CHUNK_LENGTH; + } + if (chunk_number <= MAX_CHUNKS - 3) { + shift += ((MAX_CHUNKS - 2 - chunk_number) * CHUNK_LENGTH); + } + return (key >> shift) & (chunk_number == MAX_CHUNKS - 1 ? ((1 << LAST_CHUNK_LENGTH) - 1) : OFFSET_MASK); +} + +static bpt_key_t bpt_prefix_of_key(bpt_key_t key, unsigned int chunk_number) { + if (chunk_number == MAX_CHUNKS) { + return key; + } else { + // Little-endian: + //return key & ((1 << (chunk_number * CHUNK_LENGTH)) - 1) + // Big-endian: + return key & (((1 << (chunk_number * CHUNK_LENGTH)) - 1) << (KEY_LENGTH - (chunk_number * CHUNK_LENGTH))); + } +} + +static inline unsigned int bpt_branching_chunk(bpt_t bpt) { + assert(bpt); + if (bpt->tag == BPT_LEAF) { + return MAX_CHUNKS; + } else { + return ((bpt_node_t)bpt)->branching_chunk; + } +} + +static inline unsigned int bpt_popcount(bpt_key_bitmask_t x) { + return __builtin_popcountll(x); +} + +static inline unsigned int bpt_number_of_leading_zeros(bpt_key_t x) { + return __builtin_clzll(x); +} + +static inline unsigned int bpt_number_of_trailing_zeros(bpt_key_t x) { + return __builtin_ctzll(x); +} + +static unsigned int bpt_find_diverging_chunk(bpt_key_t a, bpt_key_t b) { + // Little-endian: + //return bpt_number_of_trailing_zeros(a ^ b) / CHUNK_LENGTH; + // Big-endian: + return bpt_number_of_leading_zeros(a ^ b) / CHUNK_LENGTH; +} + +void bpt_retain(bpt_t bpt) { + if (bpt) { + __sync_fetch_and_add(&bpt->refcount, 1); + } +} + +void bpt_release(bpt_t bpt) { + if (bpt) { + if (__sync_sub_and_fetch(&bpt->refcount, 1) == 0) { + bpt_dealloc(bpt); + } + } +} + +void bpt_dealloc(bpt_t bpt) { + if (bpt) { + if (bpt->tag == BPT_LEAF) { + bpt_leaf_t b = (bpt_leaf_t)bpt; +#ifdef BPT_ENABLE_DEALLOC_HOOKS + if (b->dealloc_hook) { + b->dealloc_hook(b->bpt.prefix, b->value); + } +#endif + free(b); + } else { + bpt_node_t b = (bpt_node_t)bpt; + bpt_for_children(bpt, bpt_release); + free(b->children); + free(b); + } + } +} + +#ifdef BPT_ENABLE_DEALLOC_HOOKS +void bpt_leaf_set_dealloc_hook(bpt_leaf_t bpt, void (*hook)(bpt_key_t, void*)) { + if (bpt) { + bpt->dealloc_hook = hook; + } +} + +void bpt_set_dealloc_hook(bpt_t bpt, bpt_key_t key, void (*hook)(bpt_key_t, void*)) { + bpt_leaf_set_dealloc_hook(bpt_get_leaf(bpt, key), hook); +} +#endif diff --git a/bitmapped_patricia_tree.h b/bitmapped_patricia_tree.h new file mode 100644 index 0000000..173cd81 --- /dev/null +++ b/bitmapped_patricia_tree.h @@ -0,0 +1,69 @@ +// -*- mode: c; coding: utf-8 -*- */ +// +// Copyright 2010, 2011, Matthias Andreas Benkard. +// Modifications for lazy eval: Copyright 2011, Christoph-Simon Senjak +// +//----------------------------------------------------------------------------- +// This program is free software: you can redistribute it and/or modify +// it under the terms of the GNU Affero General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Affero General Public License for more details. +// +// You should have received a copy of the GNU Affero General Public License +// along with this program. If not, see . +//----------------------------------------------------------------------------- +// + +// An implementation of a bitmapped Patricia tree. + +#ifndef __BITMAPPED_PATRICIA_TREE_H +#define __BITMAPPED_PATRICIA_TREE_H + +#include +#include +#include +#include +#include + +#define BPT_ENABLE_DEALLOC_HOOKS 1 + +/* these values are normally set by the configure script of mulklib */ + +typedef intptr_t bpt_key_t; +typedef intptr_t bpt_key_bitmask_t; + +#define CHUNK_LENGTH ((int)log2(sizeof(bpt_key_bitmask_t)*8)) +#define KEY_LENGTH (sizeof(bpt_key_t)*8) +#define OFFSET_MASK ((1 << CHUNK_LENGTH) - 1) +#define MAX_CHUNKS (KEY_LENGTH / CHUNK_LENGTH + ((KEY_LENGTH % CHUNK_LENGTH == 0) ? 0 : 1)) +#define LAST_CHUNK_LENGTH (KEY_LENGTH - ((MAX_CHUNKS - 1) * CHUNK_LENGTH)) + +enum bpt_tag { + BPT_LEAF, + BPT_INNER_NODE +}; + +struct bpt; +typedef struct bpt *bpt_t; + +void *bpt_get(bpt_t bpt, bpt_key_t key); +bool bpt_has_key(bpt_t bpt, bpt_key_t key); +void **bpt_get_pointer(bpt_t bpt, bpt_key_t key); +bpt_t bpt_assoc(bpt_t bpt, bpt_key_t key, void *item); +bpt_t bpt_dissoc(bpt_t bpt, bpt_key_t key); +void init_bpt_leaf(bpt_t leaf, bpt_key_t key, void *value); +bpt_t bpt_make_leaf(bpt_key_t key, void *value); +void bpt_retain(bpt_t bpt); +void bpt_release(bpt_t bpt); +void bpt_dealloc(bpt_t bpt); +void bpt_seal(bpt_t bpt); + +#ifdef BPT_ENABLE_DEALLOC_HOOKS +void bpt_set_dealloc_hook(bpt_t bpt, bpt_key_t key, void (*hook)(bpt_key_t key, void* value)); +#endif +#endif diff --git a/withAsm.c b/withAsm.c new file mode 100644 index 0000000..51c1987 --- /dev/null +++ b/withAsm.c @@ -0,0 +1,32 @@ +#include +#include +#include +#include +#define __USE_GNU +#include + +// set this to REG_ECX on x86_32 +#define myREG REG_RCX + +int k = 42; + +void handle_segv(int segv, siginfo_t* siginfo, void* ucontext) { + ucontext_t* uc = (ucontext_t*) ucontext; + uc->uc_mcontext.gregs[myREG] = (greg_t) &k; +} + +void cause_segv (void* ptr) { + int d; + // d = *ptr; + asm ("movl (%%ecx), %%edx" : "=d"(d) : "c"(ptr)); + printf("%d\n", d); +} + +int main (void) { + struct sigaction q; + bzero(&q, sizeof(q)); + q.sa_sigaction = handle_segv; + q.sa_flags = SA_SIGINFO; + sigaction(11, &q, NULL); + cause_segv(NULL); +} diff --git a/withMulklib.c b/withMulklib.c new file mode 100644 index 0000000..cf4bf4f --- /dev/null +++ b/withMulklib.c @@ -0,0 +1,233 @@ +#include +#include +#include +#include +#include +#include +#include +#include +#include "bitmapped_patricia_tree.h" +#define __USE_GNU +#include + +/* This code is only for x86_64 gcc linux. It is NOT threadsafe. */ + +/* w00t, I am a three-star-programmer! */ +void ***dereferencedPointer; +void ***lastDereferencedPointer; +void **lockedPointer; +void **lastLockedPointer; + +typedef struct { + void* (*function) (void*); + void* argument; + void*** dereferencedPointer; +} tree_entry; + +bpt_t pointer_tree; + +bpt_t bpt_assoc_and_release(bpt_t bpt, bpt_key_t key, void *value) { + bpt_t new_bpt = bpt_assoc(bpt, key, value); + bpt_release(bpt); + return new_bpt; +} + +void maybeAllocateMorePointers () { + if (lastDereferencedPointer > dereferencedPointer) { + lockedPointer = (void**) mmap(NULL, + sysconf(_SC_PAGE_SIZE)*sizeof(void*), + PROT_NONE, MAP_ANONYMOUS | MAP_PRIVATE, + -1, 0); + dereferencedPointer = (void***) mmap(NULL, + sysconf(_SC_PAGE_SIZE)*sizeof(void**), + PROT_READ | PROT_WRITE, + MAP_ANONYMOUS | MAP_PRIVATE, -1, 0); + + if ((dereferencedPointer == MAP_FAILED)) { + printf("Mmap failed 2!\n"); + if ((lockedPointer == MAP_FAILED)) { + printf("Mmap failed 1!\n"); + exit(-1); + } + exit(-1); + } + + lastLockedPointer = lockedPointer + sysconf(_SC_PAGE_SIZE); + lastDereferencedPointer = dereferencedPointer + sysconf(_SC_PAGE_SIZE); + + void** lp = lockedPointer; + void*** dp = dereferencedPointer; + while (lp < lastLockedPointer) { + *dp = lp; + lp++; dp++; + } + } +} + +inline void initializePointerTree () { + pointer_tree = NULL; + dereferencedPointer = NULL + 2; + lastDereferencedPointer = 1 + dereferencedPointer; + maybeAllocateMorePointers (); +} + +void*** lazy_alloc (void* (*calculate) (void*), void* opt) { + maybeAllocateMorePointers (); + void*** ret = dereferencedPointer; + + lockedPointer++; + dereferencedPointer++; + + /* we should use a slice allocator here */ + tree_entry *en = (tree_entry*) malloc (sizeof(tree_entry)); + en->function = calculate; + en->argument = opt; + en->dereferencedPointer = ret; + + + pointer_tree = bpt_assoc_and_release(pointer_tree, (intptr_t) *ret, + (void*) en); + return ret; +} + +void handle_segv(int segv, siginfo_t* siginfo, void* ucontext) { + ucontext_t* uc = (ucontext_t*) ucontext; + + /* do disassembly at from IP */ + ud_t ud_obj; + ud_init(&ud_obj); + ud_set_mode(&ud_obj, 64); + ud_set_syntax(&ud_obj, UD_SYN_ATT); + ud_set_input_buffer(&ud_obj, (unsigned char*) uc->uc_mcontext.gregs[REG_RIP], + 10); + + /* was disassembly successful? */ + if (!ud_disassemble(&ud_obj)) { + printf("Disassembly fail!\n"); + exit(-1); + } + + /* is disassembly a memory-operation? */ + struct ud_operand op0 = ud_obj.operand[0]; + struct ud_operand op1 = ud_obj.operand[1]; + struct ud_operand op; + + if (op0.type == UD_OP_MEM) { + op = op0; + } else if (op1.type == UD_OP_MEM) { + op = op1; + } else { + printf("Instruction unknown\n"); + exit(-1); + } + + /* find out the register - this part is clumsy as we have two sets + of constants */ + + int setreg; + switch (op.base) { + case UD_R_RAX: + case UD_R_EAX: + setreg = REG_RAX; + break; + case UD_R_RCX: + case UD_R_ECX: + setreg = REG_RCX; + break; + case UD_R_RDX: + case UD_R_EDX: + setreg = REG_RDX; + break; + case UD_R_RBX: + case UD_R_EBX: + setreg = REG_RBX; + break; + case UD_R_RSP: + case UD_R_ESP: + setreg = REG_RSP; + break; + case UD_R_RBP: + case UD_R_EBP: + setreg = REG_RBP; + break; + case UD_R_RSI: + case UD_R_ESI: + setreg = REG_RSI; + break; + case UD_R_RDI: + case UD_R_EDI: + setreg = REG_RDI; + break; + case UD_R_R8: + case UD_R_R8D: + setreg = REG_R8; + break; + case UD_R_R9: + case UD_R_R9D: + setreg = REG_R9; + break; + case UD_R_R10: + case UD_R_R10D: + setreg = REG_R10; + break; + case UD_R_R11: + case UD_R_R11D: + setreg = REG_R11; + break; + case UD_R_R12: + case UD_R_R12D: + setreg = REG_R12; + break; + case UD_R_R13: + case UD_R_R13D: + setreg = REG_R13; + break; + case UD_R_R14: + case UD_R_R14D: + setreg = REG_R14; + break; + case UD_R_R15: + case UD_R_R15D: + setreg = REG_R15; + break; + default: + printf("Register not supported!\n"); + exit(-1); + } + + intptr_t address = uc->uc_mcontext.gregs[setreg]; + + if (!bpt_has_key(pointer_tree, address)) { + printf("Address not found in Patricia tree.\n"); + exit(-1); + } + + tree_entry *te = (tree_entry*) bpt_get(pointer_tree, address); + void* newAddress = (te->function)(te->argument); + *(te->dereferencedPointer) = newAddress; + + /* set the register - as before */ + uc->uc_mcontext.gregs[setreg] = (greg_t) newAddress; +} + +inline void initializeSignalHandler () { + struct sigaction q; + bzero(&q, sizeof(q)); + q.sa_sigaction = handle_segv; + q.sa_flags = SA_SIGINFO; + sigaction(11, &q, NULL); +} + +void *calculateLazy24 (void* bla) { + int* ret = (int*) malloc(sizeof(int)); + *ret = 42; + return (void*) ret; +} + +int main (void) { + initializePointerTree (); + initializeSignalHandler (); + void *** lazy42 = lazy_alloc(calculateLazy24, NULL); + printf("%d\n", **((int**)lazy42)); + +} diff --git a/withUdis.c b/withUdis.c new file mode 100644 index 0000000..1a7bccf --- /dev/null +++ b/withUdis.c @@ -0,0 +1,135 @@ +#include +#include +#include +#include +#define __USE_GNU +#include +#include + +/* This code is only for x86_64 */ + +int k = 42; + +void handle_segv(int segv, siginfo_t* siginfo, void* ucontext) { + ucontext_t* uc = (ucontext_t*) ucontext; + + /* do disassembly at from IP */ + ud_t ud_obj; + ud_init(&ud_obj); + ud_set_mode(&ud_obj, 64); + ud_set_syntax(&ud_obj, UD_SYN_ATT); + ud_set_input_buffer(&ud_obj, (unsigned char*) uc->uc_mcontext.gregs[REG_RIP], + 10); + + /* was disassembly successful? */ + if (!ud_disassemble(&ud_obj)) { + printf("Disassembly fail!\n"); + exit(-1); + } + + /* is disassembly a memory-operation? */ + struct ud_operand op0 = ud_obj.operand[0]; + struct ud_operand op1 = ud_obj.operand[1]; + struct ud_operand op; + + if (op0.type == UD_OP_MEM) { + op = op0; + } else if (op1.type == UD_OP_MEM) { + op = op1; + } else { + printf("Instruction unknown\n"); + exit(-1); + } + + /* find out the register - this part is clumsy as we have two sets + of constants */ + + int setreg; + switch (op.base) { + case UD_R_RAX: + case UD_R_EAX: + setreg = REG_RAX; + break; + case UD_R_RCX: + case UD_R_ECX: + setreg = REG_RCX; + break; + case UD_R_RDX: + case UD_R_EDX: + setreg = REG_RDX; + break; + case UD_R_RBX: + case UD_R_EBX: + setreg = REG_RBX; + break; + case UD_R_RSP: + case UD_R_ESP: + setreg = REG_RSP; + break; + case UD_R_RBP: + case UD_R_EBP: + setreg = REG_RBP; + break; + case UD_R_RSI: + case UD_R_ESI: + setreg = REG_RSI; + break; + case UD_R_RDI: + case UD_R_EDI: + setreg = REG_RDI; + break; + case UD_R_R8: + case UD_R_R8D: + setreg = REG_R8; + break; + case UD_R_R9: + case UD_R_R9D: + setreg = REG_R9; + break; + case UD_R_R10: + case UD_R_R10D: + setreg = REG_R10; + break; + case UD_R_R11: + case UD_R_R11D: + setreg = REG_R11; + break; + case UD_R_R12: + case UD_R_R12D: + setreg = REG_R12; + break; + case UD_R_R13: + case UD_R_R13D: + setreg = REG_R13; + break; + case UD_R_R14: + case UD_R_R14D: + setreg = REG_R14; + break; + case UD_R_R15: + case UD_R_R15D: + setreg = REG_R15; + break; + default: + printf("Register not supported!\n"); + exit(-1); + } + + /* set the register - as before */ + uc->uc_mcontext.gregs[setreg] = (greg_t) &k; +} + +void cause_segv (int* ptr) { + int d; + d = *ptr; + printf("%d\n", d); +} + +int main (void) { + struct sigaction q; + bzero(&q, sizeof(q)); + q.sa_sigaction = handle_segv; + q.sa_flags = SA_SIGINFO; + sigaction(11, &q, NULL); + cause_segv(NULL); +} -- 2.20.1