DR_EXPORT bool drx_aflags_are_dead(instr_t *where) { instr_t *instr; uint flags; for (instr = where; instr != NULL; instr = instr_get_next(instr)) { /* we treat syscall/interrupt as aflags read */ if (instr_is_syscall(instr) || instr_is_interrupt(instr)) return false; flags = instr_get_arith_flags(instr, DR_QUERY_DEFAULT); if (TESTANY(EFLAGS_READ_ARITH, flags)) return false; if (TESTALL(EFLAGS_WRITE_ARITH, flags)) return true; if (instr_is_cti(instr)) { if (instr_is_app(instr) && (instr_is_ubr(instr) || instr_is_call_direct(instr))) { instr_t *next = instr_get_next(instr); opnd_t tgt = instr_get_target(instr); /* continue on elision */ if (next != NULL && instr_is_app(next) && opnd_is_pc(tgt) && opnd_get_pc(tgt) == instr_get_app_pc(next)) continue; } /* unknown target, assume aflags is live */ return false; } } return false; }
bool instr_is_near_ubr(instr_t *instr) /* unconditional branch */ { return instr_is_ubr(instr); }
static void module_load_event(void *drcontext, const module_data_t *mod, bool loaded) { if (strstr(dr_module_preferred_name(mod), "client.drwrap-test.appdll.") != NULL) { bool ok; instr_t inst; app_pc init_pc, pc, next_pc; load_count++; if (load_count == 2) { /* test no-frills */ drwrap_set_global_flags(DRWRAP_NO_FRILLS); } addr_replace = (app_pc) dr_get_proc_address(mod->handle, "replaceme"); CHECK(addr_replace != NULL, "cannot find lib export"); ok = drwrap_replace(addr_replace, (app_pc) replacewith, false); CHECK(ok, "replace failed"); addr_replace2 = (app_pc) dr_get_proc_address(mod->handle, "replaceme2"); CHECK(addr_replace2 != NULL, "cannot find lib export"); ok = drwrap_replace_native(addr_replace2, (app_pc) replacewith2, true/*at entry*/, 0, (void *)(ptr_int_t)DRWRAP_NATIVE_PARAM, false); CHECK(ok, "replace_native failed"); init_pc = (app_pc) dr_get_proc_address(mod->handle, "replace_callsite"); CHECK(init_pc != NULL, "cannot find lib export"); /* Find callsite: we assume we'll linearly hit a ret. We take final call * to skip any PIC call. */ instr_init(drcontext, &inst); pc = init_pc; do { instr_reset(drcontext, &inst); next_pc = decode(drcontext, pc, &inst); if (!instr_valid(&inst)) break; /* if initial jmp, follow it to handle ILT-indirection */ if (pc == init_pc && instr_is_ubr(&inst)) next_pc = opnd_get_pc(instr_get_target(&inst)); else if (instr_is_call(&inst)) addr_replace_callsite = pc; pc = next_pc; } while (instr_valid(&inst) && !instr_is_return(&inst)); CHECK(addr_replace_callsite != NULL, "cannot find lib export"); ok = drwrap_replace_native(addr_replace_callsite, (app_pc) replace_callsite, false/*!at entry*/, 0, (void *)(ptr_int_t)DRWRAP_NATIVE_PARAM, false); CHECK(ok, "replace_native failed"); instr_free(drcontext, &inst); wrap_addr(&addr_level0, "level0", mod, true, true); wrap_addr(&addr_level1, "level1", mod, true, true); wrap_addr(&addr_level2, "level2", mod, true, true); wrap_addr(&addr_tailcall, "makes_tailcall", mod, true, true); wrap_addr(&addr_skipme, "skipme", mod, true, true); wrap_addr(&addr_repeat, "repeatme", mod, true, true); wrap_addr(&addr_preonly, "preonly", mod, true, false); wrap_addr(&addr_postonly, "postonly", mod, false, true); wrap_addr(&addr_runlots, "runlots", mod, false, true); /* test longjmp */ wrap_unwindtest_addr(&addr_long0, "long0", mod); wrap_unwindtest_addr(&addr_long1, "long1", mod); wrap_unwindtest_addr(&addr_long2, "long2", mod); wrap_unwindtest_addr(&addr_long3, "long3", mod); wrap_unwindtest_addr(&addr_longdone, "longdone", mod); drmgr_set_tls_field(drcontext, tls_idx, (void *)(ptr_uint_t)0); #ifdef WINDOWS /* test SEH */ /* we can't do this test for no-frills b/c only one wrap per addr */ if (load_count == 1) { ok = drwrap_wrap_ex(addr_long0, wrap_unwindtest_seh_pre, wrap_unwindtest_seh_post, NULL, DRWRAP_UNWIND_ON_EXCEPTION); CHECK(ok, "wrap failed"); ok = drwrap_wrap_ex(addr_long1, wrap_unwindtest_seh_pre, wrap_unwindtest_seh_post, NULL, DRWRAP_UNWIND_ON_EXCEPTION); CHECK(ok, "wrap failed"); ok = drwrap_wrap_ex(addr_long2, wrap_unwindtest_seh_pre, wrap_unwindtest_seh_post, NULL, DRWRAP_UNWIND_ON_EXCEPTION); CHECK(ok, "wrap failed"); ok = drwrap_wrap_ex(addr_long3, wrap_unwindtest_seh_pre, wrap_unwindtest_seh_post, NULL, DRWRAP_UNWIND_ON_EXCEPTION); CHECK(ok, "wrap failed"); ok = drwrap_wrap_ex(addr_longdone, wrap_unwindtest_seh_pre, wrap_unwindtest_seh_post, NULL, DRWRAP_UNWIND_ON_EXCEPTION); CHECK(ok, "wrap failed"); } #endif /* test leaner wrapping */ if (load_count == 2) drwrap_set_global_flags(DRWRAP_NO_FRILLS | DRWRAP_FAST_CLEANCALLS); wrap_addr(&addr_skip_flags, "skip_flags", mod, true, false); } }