/*
 * Copyright (C) 2012 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_x86.S"

    /*
     * Portable invocation stub.
     * On entry:
     *   [sp] = return address
     *   [sp + 4] = method pointer
     *   [sp + 8] = argument array or NULL for no argument methods
     *   [sp + 12] = size of argument array in bytes
     *   [sp + 16] = (managed) thread pointer
     *   [sp + 20] = JValue* result
     *   [sp + 24] = result type char
     */
DEFINE_FUNCTION art_portable_invoke_stub
    PUSH ebp                      // save ebp
    PUSH ebx                      // save ebx
    mov %esp, %ebp                // copy value of stack pointer into base pointer
    CFI_DEF_CFA_REGISTER(ebp)
    mov 20(%ebp), %ebx            // get arg array size
    addl LITERAL(28), %ebx        // reserve space for return addr, method*, ebx, and ebp in frame
    andl LITERAL(0xFFFFFFF0), %ebx    // align frame size to 16 bytes
    subl LITERAL(12), %ebx        // remove space for return address, ebx, and ebp
    subl %ebx, %esp               // reserve stack space for argument array
    SETUP_GOT_NOSAVE              // reset ebx to GOT table
    lea  4(%esp), %eax            // use stack pointer + method ptr as dest for memcpy
    pushl 20(%ebp)                // push size of region to memcpy
    pushl 16(%ebp)                // push arg array as source of memcpy
    pushl %eax                    // push stack pointer as destination of memcpy
    call PLT_SYMBOL(memcpy)       // (void*, const void*, size_t)
    addl LITERAL(12), %esp        // pop arguments to memcpy
    mov 12(%ebp), %eax            // move method pointer into eax
    mov %eax, (%esp)              // push method pointer onto stack
    call *METHOD_PORTABLE_CODE_OFFSET(%eax) // call the method
    mov %ebp, %esp                // restore stack pointer
    POP ebx                       // pop ebx
    POP ebp                       // pop ebp
    mov 20(%esp), %ecx            // get result pointer
    cmpl LITERAL(68), 24(%esp)    // test if result type char == 'D'
    je .Lreturn_double_portable
    cmpl LITERAL(70), 24(%esp)    // test if result type char == 'F'
    je .Lreturn_float_portable
    mov %eax, (%ecx)              // store the result
    mov %edx, 4(%ecx)             // store the other half of the result
    ret
.Lreturn_double_portable:
    fstpl (%ecx)                  // store the floating point result as double
    ret
.Lreturn_float_portable:
    fstps (%ecx)                  // store the floating point result as float
    ret
END_FUNCTION art_portable_invoke_stub

DEFINE_FUNCTION art_portable_proxy_invoke_handler
    PUSH ebp                        // Set up frame.
    movl %esp, %ebp
    CFI_DEF_CFA_REGISTER(%ebp)
    subl LITERAL(4), %esp           // Align stack
    SETUP_GOT                       // pushes ebx
    leal 8(%ebp), %edx              // %edx = ArtMethod** called_addr
    movl 12(%ebp), %ecx             // %ecx = receiver
    movl 0(%edx), %eax              // %eax = ArtMethod* called
    pushl %edx                      // Pass called_addr.
    pushl %fs:THREAD_SELF_OFFSET    // Pass thread.
    pushl %ecx                      // Pass receiver.
    pushl %eax                      // Pass called.
    call PLT_SYMBOL(artPortableProxyInvokeHandler)  // (called, receiver, Thread*, &called)
    UNDO_SETUP_GOT
    leave
    CFI_RESTORE(%ebp)
    CFI_DEF_CFA(%esp, 4)
    movd %eax, %xmm0              // Place return value also into floating point return value.
    movd %edx, %xmm1
    punpckldq %xmm1, %xmm0
    ret
END_FUNCTION art_portable_proxy_invoke_handler

DEFINE_FUNCTION art_portable_resolution_trampoline
  PUSH ebp                        // Set up frame.
  movl %esp, %ebp
  CFI_DEF_CFA_REGISTER(%ebp)
  subl LITERAL(4), %esp           // Align stack
  SETUP_GOT                       // pushes ebx
  leal 8(%ebp), %edx              // %edx = ArtMethod** called_addr
  movl 12(%ebp), %ecx             // %ecx = receiver
  movl 0(%edx), %eax              // %eax = ArtMethod* called
  pushl %edx                      // Pass called_addr.
  pushl %fs:THREAD_SELF_OFFSET    // Pass thread.
  pushl %ecx                      // Pass receiver.
  pushl %eax                      // Pass called.
  call PLT_SYMBOL(artPortableResolutionTrampoline)  // (called, receiver, Thread*, &called)
  UNDO_SETUP_GOT
  leave
  CFI_RESTORE(%ebp)
  CFI_DEF_CFA(%esp, 4)
  testl %eax, %eax
  jz  .Lresolve_fail
  jmp * %eax
.Lresolve_fail:                   // Resolution failed, return with exception pending.
  ret
END_FUNCTION art_portable_resolution_trampoline

DEFINE_FUNCTION art_portable_to_interpreter_bridge
  PUSH ebp                        // Set up frame.
  movl %esp, %ebp
  CFI_DEF_CFA_REGISTER(%ebp)
  subl LITERAL(8), %esp           // Align stack
  SETUP_GOT
  leal 8(%ebp), %edx              // %edx = ArtMethod** called_addr
  movl 0(%edx), %eax              // %eax = ArtMethod* called
  pushl %edx                      // Pass called_addr.
  pushl %fs:THREAD_SELF_OFFSET    // Pass thread.
  pushl %eax                      // Pass called.
  call PLT_SYMBOL(artPortableToInterpreterBridge)  // (called, Thread*, &called)
  UNDO_SETUP_GOT
  leave
  CFI_RESTORE(%ebp)
  CFI_DEF_CFA(%esp, 4)
  ret
END_FUNCTION art_portable_to_interpreter_bridge