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afl-gcc-cmplog-pass.so.cc
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afl-gcc-cmplog-pass.so.cc
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/* GCC plugin for cmplog instrumentation of code for AFL++.
Copyright 2014-2019 Free Software Foundation, Inc
Copyright 2015, 2016 Google Inc. All rights reserved.
Copyright 2019-2020 AFLplusplus Project. All rights reserved.
Copyright 2019-2023 AdaCore
Written by Alexandre Oliva <[email protected]>, based on the AFL++
LLVM CmpLog pass by Andrea Fioraldi <[email protected]>, and
on the AFL GCC pass.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "afl-gcc-common.h"
/* This plugin, being under the same license as GCC, satisfies the
"GPL-compatible Software" definition in the GCC RUNTIME LIBRARY
EXCEPTION, so it can be part of an "Eligible" "Compilation
Process". */
int plugin_is_GPL_compatible = 1;
namespace {
static const struct pass_data afl_cmplog_pass_data = {
.type = GIMPLE_PASS,
.name = "aflcmplog",
.optinfo_flags = OPTGROUP_NONE,
.tv_id = TV_NONE,
.properties_required = 0,
.properties_provided = 0,
.properties_destroyed = 0,
.todo_flags_start = 0,
.todo_flags_finish = (TODO_update_ssa | TODO_cleanup_cfg | TODO_verify_il |
TODO_rebuild_cgraph_edges),
};
struct afl_cmplog_pass : afl_base_pass {
afl_cmplog_pass(bool quiet)
: afl_base_pass(quiet, /*debug=*/false, afl_cmplog_pass_data),
t8u(),
cmplog_hooks() {
}
/* An unsigned 8-bit integral type. */
tree t8u;
/* Declarations for the various cmplog hook functions, allocated on demand..
[0] is for __cmplog_ins_hookN, that accepts non-power-of-2 sizes.
[n in 1..5] are for unsigned ints of 2^{n-1} bytes. */
tree cmplog_hooks[6];
tree cmplog_hook(unsigned i) {
tree t, fnt;
if (!t8u) {
if (BITS_PER_UNIT == 8)
t8u = unsigned_char_type_node;
else
t8u = build_nonstandard_integer_type(8, 1);
}
if (i <= ARRAY_SIZE(cmplog_hooks) && cmplog_hooks[i])
return cmplog_hooks[i];
switch (i) {
case 0:
#ifdef uint128_type_node
t = uint128_type_node;
#else
t = build_nonstandard_integer_type(128, 1);
#endif
fnt =
build_function_type_list(void_type_node, t, t, t8u, t8u, NULL_TREE);
t = cmplog_hooks[0] = build_fn_decl("__cmplog_ins_hookN", fnt);
break;
case 1:
t = t8u;
fnt = build_function_type_list(void_type_node, t, t, t8u, NULL_TREE);
t = cmplog_hooks[1] = build_fn_decl("__cmplog_ins_hook1", fnt);
break;
case 2:
t = uint16_type_node;
fnt = build_function_type_list(void_type_node, t, t, t8u, NULL_TREE);
t = cmplog_hooks[2] = build_fn_decl("__cmplog_ins_hook2", fnt);
break;
case 3:
t = uint32_type_node;
fnt = build_function_type_list(void_type_node, t, t, t8u, NULL_TREE);
t = cmplog_hooks[3] = build_fn_decl("__cmplog_ins_hook4", fnt);
break;
case 4:
t = uint64_type_node;
fnt = build_function_type_list(void_type_node, t, t, t8u, NULL_TREE);
t = cmplog_hooks[4] = build_fn_decl("__cmplog_ins_hook8", fnt);
break;
case 5:
#ifdef uint128_type_node
t = uint128_type_node;
#else
t = build_nonstandard_integer_type(128, 1);
#endif
fnt = build_function_type_list(void_type_node, t, t, t8u, NULL_TREE);
t = cmplog_hooks[5] = build_fn_decl("__cmplog_ins_hook16", fnt);
break;
default:
gcc_unreachable();
}
/* Mark the newly-created decl as non-throwing, so that we can
insert call within basic blocks. */
TREE_NOTHROW(t) = 1;
return t;
}
/* Insert a cmplog hook call before GSI for a CODE compare between
LHS and RHS. */
void insert_cmplog_call(gimple_stmt_iterator gsi, tree_code code, tree lhs,
tree rhs) {
gcc_checking_assert(TYPE_MAIN_VARIANT(TREE_TYPE(lhs)) ==
TYPE_MAIN_VARIANT(TREE_TYPE(rhs)));
tree fn;
bool pass_n = false;
/* Obtain the compare operand size as a constant. */
tree st = TREE_TYPE(lhs);
tree szt = TYPE_SIZE(st);
if (!tree_fits_uhwi_p(szt)) return;
unsigned HOST_WIDE_INT sz = tree_to_uhwi(szt);
/* Round it up. */
if (sz % 8) sz = (((sz - 1) / 8) + 1) * 8;
/* Select the hook function to call, based on the size. */
switch (sz) {
default:
fn = cmplog_hook(0);
pass_n = true;
break;
case 8:
fn = cmplog_hook(1);
break;
case 16:
fn = cmplog_hook(2);
break;
case 32:
fn = cmplog_hook(3);
break;
case 64:
fn = cmplog_hook(4);
break;
case 128:
fn = cmplog_hook(5);
break;
}
/* Set attr according to the compare operation. */
unsigned char attr = 0;
switch (code) {
case UNORDERED_EXPR:
case ORDERED_EXPR:
/* ??? */
/* Fallthrough. */
case NE_EXPR:
case LTGT_EXPR:
break;
case EQ_EXPR:
case UNEQ_EXPR:
attr += 1;
break;
case GT_EXPR:
case UNGT_EXPR:
attr += 2;
break;
case GE_EXPR:
case UNGE_EXPR:
attr += 3;
break;
case LT_EXPR:
case UNLT_EXPR:
attr += 4;
break;
case LE_EXPR:
case UNLE_EXPR:
attr += 5;
break;
default:
gcc_unreachable();
}
if (FLOAT_TYPE_P(TREE_TYPE(lhs))) {
attr += 8;
tree t = build_nonstandard_integer_type(sz, 1);
tree s = make_ssa_name(t);
gimple g = gimple_build_assign(s, VIEW_CONVERT_EXPR,
build1(VIEW_CONVERT_EXPR, t, lhs));
lhs = s;
gsi_insert_before(&gsi, g, GSI_SAME_STMT);
s = make_ssa_name(t);
g = gimple_build_assign(s, VIEW_CONVERT_EXPR,
build1(VIEW_CONVERT_EXPR, t, rhs));
rhs = s;
gsi_insert_before(&gsi, g, GSI_SAME_STMT);
}
/* Convert the operands to the hook arg type, if needed. */
tree t = TREE_VALUE(TYPE_ARG_TYPES(TREE_TYPE(fn)));
lhs = fold_convert_loc(UNKNOWN_LOCATION, t, lhs);
if (!is_gimple_val(lhs)) {
tree s = make_ssa_name(t);
gimple g = gimple_build_assign(s, lhs);
lhs = s;
gsi_insert_before(&gsi, g, GSI_SAME_STMT);
}
rhs = fold_convert_loc(UNKNOWN_LOCATION, t, rhs);
if (!is_gimple_val(rhs)) {
tree s = make_ssa_name(t);
gimple g = gimple_build_assign(s, rhs);
rhs = s;
gsi_insert_before(&gsi, g, GSI_SAME_STMT);
}
/* Insert the call. */
tree att = build_int_cst(t8u, attr);
gimple call;
if (pass_n)
call = gimple_build_call(fn, 4, lhs, rhs, att,
build_int_cst(t8u, sz / 8 - 1));
else
call = gimple_build_call(fn, 3, lhs, rhs, att);
gsi_insert_before(&gsi, call, GSI_SAME_STMT);
}
virtual unsigned int execute(function *fn) {
if (!isInInstrumentList(fn)) return 0;
basic_block bb;
FOR_EACH_BB_FN(bb, fn) {
/* A GIMPLE_COND or GIMPLE_SWITCH will always be the last stmt
in a BB. */
gimple_stmt_iterator gsi = gsi_last_bb(bb);
if (gsi_end_p(gsi)) continue;
gimple stmt = gsi_stmt(gsi);
if (gimple_code(stmt) == GIMPLE_COND) {
tree_code code = gimple_cond_code(stmt);
tree lhs = gimple_cond_lhs(stmt);
tree rhs = gimple_cond_rhs(stmt);
insert_cmplog_call(gsi, code, lhs, rhs);
} else if (gimple_code(stmt) == GIMPLE_SWITCH) {
gswitch *sw = as_a<gswitch *>(stmt);
tree lhs = gimple_switch_index(sw);
for (int i = 0, e = gimple_switch_num_labels(sw); i < e; i++) {
tree clx = gimple_switch_label(sw, i);
tree rhsl = CASE_LOW(clx);
/* Default case labels exprs don't have a CASE_LOW. */
if (!rhsl) continue;
tree rhsh = CASE_HIGH(clx);
/* If there is a CASE_HIGH, issue range compares. */
if (rhsh) {
insert_cmplog_call(gsi, GE_EXPR, lhs, rhsl);
insert_cmplog_call(gsi, LE_EXPR, lhs, rhsh);
}
/* Otherwise, use a single equality compare. */
else
insert_cmplog_call(gsi, EQ_EXPR, lhs, rhsl);
}
} else
continue;
}
return 0;
}
};
static struct plugin_info afl_cmplog_plugin = {
.version = "20220420",
.help = G_("AFL gcc cmplog plugin\n\
\n\
Set AFL_QUIET in the environment to silence it.\n\
"),
};
} // namespace
/* This is the function GCC calls when loading a plugin. Initialize
and register further callbacks. */
int plugin_init(struct plugin_name_args *info,
struct plugin_gcc_version *version) {
if (!plugin_default_version_check(version, &gcc_version))
FATAL(G_("GCC and plugin have incompatible versions, expected GCC %s, "
"is %s"),
gcc_version.basever, version->basever);
/* Show a banner. */
bool quiet = false;
if (isatty(2) && !getenv("AFL_QUIET"))
SAYF(cCYA "afl-gcc-cmplog-pass " cBRI VERSION cRST
" by <[email protected]>\n");
else
quiet = true;
const char *name = info->base_name;
register_callback(name, PLUGIN_INFO, NULL, &afl_cmplog_plugin);
afl_cmplog_pass *aflp = new afl_cmplog_pass(quiet);
struct register_pass_info pass_info = {
.pass = aflp,
.reference_pass_name = "ssa",
.ref_pass_instance_number = 1,
.pos_op = PASS_POS_INSERT_AFTER,
};
register_callback(name, PLUGIN_PASS_MANAGER_SETUP, NULL, &pass_info);
return 0;
}