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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "asm_support_arm64.S"
/*
* Jni dlsym lookup stub.
*/
.extern artFindNativeMethod
.extern artFindNativeMethodRunnable
ENTRY art_jni_dlsym_lookup_stub
// spill regs.
stp x29, x30, [sp, #-16]!
.cfi_adjust_cfa_offset 16
.cfi_rel_offset x29, 0
.cfi_rel_offset x30, 8
mov x29, sp
stp d6, d7, [sp, #-16]!
.cfi_adjust_cfa_offset 16
stp d4, d5, [sp, #-16]!
.cfi_adjust_cfa_offset 16
stp d2, d3, [sp, #-16]!
.cfi_adjust_cfa_offset 16
stp d0, d1, [sp, #-16]!
.cfi_adjust_cfa_offset 16
stp x6, x7, [sp, #-16]!
.cfi_adjust_cfa_offset 16
stp x4, x5, [sp, #-16]!
.cfi_adjust_cfa_offset 16
stp x2, x3, [sp, #-16]!
.cfi_adjust_cfa_offset 16
stp x0, x1, [sp, #-16]!
.cfi_adjust_cfa_offset 16
mov x0, xSELF // pass Thread::Current()
// Call artFindNativeMethod() for normal native and artFindNativeMethodRunnable()
// for @FastNative or @CriticalNative.
ldr xIP0, [x0, #THREAD_TOP_QUICK_FRAME_OFFSET] // uintptr_t tagged_quick_frame
bic xIP0, xIP0, #1 // ArtMethod** sp
ldr xIP0, [xIP0] // ArtMethod* method
ldr xIP0, [xIP0, #ART_METHOD_ACCESS_FLAGS_OFFSET] // uint32_t access_flags
mov xIP1, #(ACCESS_FLAGS_METHOD_IS_FAST_NATIVE | ACCESS_FLAGS_METHOD_IS_CRITICAL_NATIVE)
tst xIP0, xIP1
b.ne .Llookup_stub_fast_native
bl artFindNativeMethod
b .Llookup_stub_continue
.Llookup_stub_fast_native:
bl artFindNativeMethodRunnable
.Llookup_stub_continue:
mov x17, x0 // store result in scratch reg.
// load spill regs.
ldp x0, x1, [sp], #16
.cfi_adjust_cfa_offset -16
ldp x2, x3, [sp], #16
.cfi_adjust_cfa_offset -16
ldp x4, x5, [sp], #16
.cfi_adjust_cfa_offset -16
ldp x6, x7, [sp], #16
.cfi_adjust_cfa_offset -16
ldp d0, d1, [sp], #16
.cfi_adjust_cfa_offset -16
ldp d2, d3, [sp], #16
.cfi_adjust_cfa_offset -16
ldp d4, d5, [sp], #16
.cfi_adjust_cfa_offset -16
ldp d6, d7, [sp], #16
.cfi_adjust_cfa_offset -16
ldp x29, x30, [sp], #16
.cfi_adjust_cfa_offset -16
.cfi_restore x29
.cfi_restore x30
cbz x17, 1f // is method code null ?
br x17 // if non-null, tail call to method's code.
1:
ret // restore regs and return to caller to handle exception.
END art_jni_dlsym_lookup_stub
ENTRY art_jni_dlsym_lookup_critical_stub
// The hidden arg holding the tagged method (bit 0 set means GenericJNI) is x15.
// For Generic JNI we already have a managed frame, so we reuse the art_jni_dlsym_lookup_stub.
tbnz x15, #0, art_jni_dlsym_lookup_stub
// We need to create a GenericJNI managed frame above the stack args.
// GenericJNI frame is similar to SaveRegsAndArgs frame with the native method
// instead of runtime method saved at the bottom. Note that the runtime shall
// not examine the args here, otherwise we would have to move them in registers
// and stack to account for the difference between managed and native ABIs.
INCREASE_FRAME FRAME_SIZE_SAVE_REFS_AND_ARGS
SETUP_SAVE_REFS_AND_ARGS_FRAME_INTERNAL sp
// Save the hidden arg as method pointer, x0 in the padding.
// (x0 is an arg in native ABI but not considered an arg in managed ABI.)
SAVE_TWO_REGS x15, x0, 0
// Call artCriticalNativeOutArgsSize(method)
mov x0, x15 // x0 := method (from hidden arg)
bl artCriticalNativeOutArgsSize
// Check if we have any stack args.
cbnz x0, .Lcritical_has_stack_args
// Without stack args, the frame is fully constructed.
// Place tagged managed sp in Thread::Current()->top_quick_frame.
mov xIP0, sp
orr xIP0, xIP0, #1 // Tag as GenericJNI frame.
str xIP0, [xSELF, #THREAD_TOP_QUICK_FRAME_OFFSET]
// Call artFindNativeMethodRunnable()
mov x0, xSELF // pass Thread::Current()
bl artFindNativeMethodRunnable
// Store result in scratch reg.
mov xIP0, x0
// Restore frame.
.cfi_remember_state
RESTORE_TWO_REGS x15, x0, 0
RESTORE_SAVE_REFS_AND_ARGS_FRAME
REFRESH_MARKING_REGISTER
// Check for exception.
cbz xIP0, .Lcritical_deliver_exception
// Do the tail call
br xIP0
.cfi_restore_state
.cfi_def_cfa_offset FRAME_SIZE_SAVE_REFS_AND_ARGS
.Lcritical_has_stack_args:
// Move the out args size to a scratch register.
mov xIP0, x0
// Restore register args as we're about to move stack args.
RESTORE_TWO_REGS x15, x0, 0
RESTORE_SAVE_REFS_AND_ARGS_FRAME_INTERNAL sp
// Move out args. For simplicity include the return address at the end.
mov x8, sp // Destination.
add x9, sp, xIP0 // Destination end.
1:
ldp x10, x11, [x8, #FRAME_SIZE_SAVE_REFS_AND_ARGS]
stp x10, x11, [x8], #16
cmp x8, x9
bne 1b
// Save our LR, load caller's LR and redefine CFI to take ownership of the JNI stub frame.
str xLR, [x9, #-__SIZEOF_POINTER__]
mov xLR, x11 // The last moved value from the loop above.
.cfi_def_cfa x9, FRAME_SIZE_SAVE_REFS_AND_ARGS
// Re-create the SaveRefsAndArgs frame above the args.
SETUP_SAVE_REFS_AND_ARGS_FRAME_INTERNAL x9
SAVE_TWO_REGS_BASE x9, x15, x0, 0
// Move the frame register to a callee-save register.
mov x29, x9
.cfi_def_cfa_register x29
// Place tagged managed sp in Thread::Current()->top_quick_frame.
orr xIP0, x29, #1 // Tag as GenericJNI frame.
str xIP0, [xSELF, #THREAD_TOP_QUICK_FRAME_OFFSET]
// Call artFindNativeMethodRunnable()
mov x0, xSELF // pass Thread::Current()
bl artFindNativeMethodRunnable
// Store result in scratch reg.
mov xIP0, x0
// Restore the frame.
mov x9, x29
.cfi_def_cfa_register x9
RESTORE_TWO_REGS_BASE x9, x15, x0, 0
RESTORE_SAVE_REFS_AND_ARGS_FRAME_INTERNAL x9
REFRESH_MARKING_REGISTER
// Check for exception.
cbz xIP0, 3f
// Move stack args to their original place.
mov x8, x9
2:
ldp x10, x11, [x8, #-16]!
stp x10, x11, [x8, #FRAME_SIZE_SAVE_REFS_AND_ARGS]
cmp sp, x8
bne 2b
// Replace original return address with caller's return address.
ldr xIP1, [x9, #(FRAME_SIZE_SAVE_REFS_AND_ARGS - __SIZEOF_POINTER__)]
str xLR, [x9, #(FRAME_SIZE_SAVE_REFS_AND_ARGS - __SIZEOF_POINTER__)]
// Restore LR and redefine CFI to release ownership of the JNI stub frame.
.cfi_remember_state
mov xLR, xIP1
.cfi_def_cfa sp, FRAME_SIZE_SAVE_REFS_AND_ARGS
// Remove the frame reservation.
DECREASE_FRAME FRAME_SIZE_SAVE_REFS_AND_ARGS
// Do the tail call.
br xIP0
.cfi_restore_state
.cfi_def_cfa x9, FRAME_SIZE_SAVE_REFS_AND_ARGS
3:
// Drop stack args and the SaveRefsAndArgs reservation.
mov sp, x9
add sp, sp, #FRAME_SIZE_SAVE_REFS_AND_ARGS
.cfi_def_cfa sp, 0
.Lcritical_deliver_exception:
// When delivering exception, we check that xSELF was saved but the SaveRefsAndArgs frame does
// not save it, so we cannot use DELIVER_PENDING_EXCEPTION_FRAME_READY with the above frames.
DELIVER_PENDING_EXCEPTION
END art_jni_dlsym_lookup_critical_stub
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