1/* 2 * Copyright (C) 2024 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include "asm_support_arm64.S" 18#include "interpreter/cfi_asm_support.h" 19 20/* 21 * This file contains all native entrypoints that are called using the native ABI and do not 22 * transition to the quick ABI. For example: the switch interpreter (using the native ABI) directly 23 * calls ExecuteSwitchImplAsm and this code will always return back to the switch interpreter, 24 * again using the native ABI. Because of this behaviour ExecuteSwitchImplAsm should be included in 25 * this file. This is done so these native entrypoints can be compiled independently to quick 26 * entrypoints for cases when the kRuntimeISA and kRuntimeQuickCodeISA do not match. 27 * 28 * See comment on StackType (thread.h) for definitions and examples of quick ABI/code and 29 * native ABI/code. 30 */ 31 32// Wrap ExecuteSwitchImpl in assembly method which specifies DEX PC for unwinding. 33// Argument 0: x0: The context pointer for ExecuteSwitchImpl. 34// Argument 1: x1: Pointer to the templated ExecuteSwitchImpl to call. 35// Argument 2: x2: The value of DEX PC (memory address of the methods bytecode). 36ENTRY ExecuteSwitchImplAsm 37 SAVE_TWO_REGS_INCREASE_FRAME x19, xLR, 16 38 mov x19, x2 // x19 = DEX PC 39 CFI_DEFINE_DEX_PC_WITH_OFFSET(0 /* x0 */, 19 /* x19 */, 0) 40 blr x1 // Call the wrapped method. 41 RESTORE_TWO_REGS_DECREASE_FRAME x19, xLR, 16 42 ret 43END ExecuteSwitchImplAsm 44 45 /* 46 * Jni dlsym lookup stub. 47 */ 48 .extern artFindNativeMethod 49 .extern artFindNativeMethodRunnable 50ENTRY art_jni_dlsym_lookup_stub 51 // spill regs. 52 SAVE_ALL_ARGS_INCREASE_FRAME 2 * 8 53 stp x29, x30, [sp, ALL_ARGS_SIZE] 54 .cfi_rel_offset x29, ALL_ARGS_SIZE 55 .cfi_rel_offset x30, ALL_ARGS_SIZE + 8 56 add x29, sp, ALL_ARGS_SIZE 57 58 mov x0, xSELF // pass Thread::Current() 59 // Call artFindNativeMethod() for normal native and artFindNativeMethodRunnable() 60 // for @FastNative or @CriticalNative. 61 ldr xIP0, [x0, #THREAD_TOP_QUICK_FRAME_OFFSET] // uintptr_t tagged_quick_frame 62 bic xIP0, xIP0, #TAGGED_JNI_SP_MASK // ArtMethod** sp 63 ldr xIP0, [xIP0] // ArtMethod* method 64 ldr xIP0, [xIP0, #ART_METHOD_ACCESS_FLAGS_OFFSET] // uint32_t access_flags 65#ifdef ART_USE_RESTRICTED_MODE 66 // Critical native methods are disabled and treated as normal native methods instead. 67 mov xIP1, #(ACCESS_FLAGS_METHOD_IS_FAST_NATIVE) 68#else 69 mov xIP1, #(ACCESS_FLAGS_METHOD_IS_FAST_NATIVE | ACCESS_FLAGS_METHOD_IS_CRITICAL_NATIVE) 70#endif 71 tst xIP0, xIP1 72 b.ne .Llookup_stub_fast_or_critical_native 73 bl artFindNativeMethod 74 b .Llookup_stub_continue 75 .Llookup_stub_fast_or_critical_native: 76 bl artFindNativeMethodRunnable 77.Llookup_stub_continue: 78 mov x17, x0 // store result in scratch reg. 79 80 // load spill regs. 81 ldp x29, x30, [sp, #ALL_ARGS_SIZE] 82 .cfi_restore x29 83 .cfi_restore x30 84 RESTORE_ALL_ARGS_DECREASE_FRAME 2 * 8 85 86 cbz x17, 1f // is method code null ? 87 br x17 // if non-null, tail call to method's code. 88 891: 90 ret // restore regs and return to caller to handle exception. 91END art_jni_dlsym_lookup_stub 92