nkeynes@539 | 1 | /**
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nkeynes@561 | 2 | * $Id$
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nkeynes@539 | 3 | *
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nkeynes@539 | 4 | * Provides the implementation for the ia32 ABI (eg prologue, epilogue, and
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nkeynes@539 | 5 | * calling conventions)
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nkeynes@539 | 6 | *
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nkeynes@539 | 7 | * Copyright (c) 2007 Nathan Keynes.
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nkeynes@539 | 8 | *
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nkeynes@539 | 9 | * This program is free software; you can redistribute it and/or modify
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nkeynes@539 | 10 | * it under the terms of the GNU General Public License as published by
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nkeynes@539 | 11 | * the Free Software Foundation; either version 2 of the License, or
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nkeynes@539 | 12 | * (at your option) any later version.
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nkeynes@539 | 13 | *
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nkeynes@539 | 14 | * This program is distributed in the hope that it will be useful,
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nkeynes@539 | 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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nkeynes@539 | 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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nkeynes@539 | 17 | * GNU General Public License for more details.
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nkeynes@539 | 18 | */
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nkeynes@539 | 19 |
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nkeynes@539 | 20 | #ifndef __lxdream_ia32abi_H
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nkeynes@539 | 21 | #define __lxdream_ia32abi_H 1
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nkeynes@539 | 22 |
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nkeynes@539 | 23 | #define load_ptr( reg, ptr ) load_imm32( reg, (uint32_t)ptr );
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nkeynes@539 | 24 |
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nkeynes@539 | 25 | /**
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nkeynes@539 | 26 | * Note: clobbers EAX to make the indirect call - this isn't usually
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nkeynes@539 | 27 | * a problem since the callee will usually clobber it anyway.
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nkeynes@539 | 28 | */
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nkeynes@539 | 29 | #define CALL_FUNC0_SIZE 7
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nkeynes@539 | 30 | static inline void call_func0( void *ptr )
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nkeynes@539 | 31 | {
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nkeynes@539 | 32 | load_imm32(R_EAX, (uint32_t)ptr);
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nkeynes@539 | 33 | CALL_r32(R_EAX);
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nkeynes@539 | 34 | }
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nkeynes@539 | 35 |
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nkeynes@539 | 36 | #define CALL_FUNC1_SIZE 11
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nkeynes@539 | 37 | static inline void call_func1( void *ptr, int arg1 )
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nkeynes@539 | 38 | {
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nkeynes@539 | 39 | PUSH_r32(arg1);
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nkeynes@539 | 40 | call_func0(ptr);
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nkeynes@539 | 41 | ADD_imm8s_r32( 4, R_ESP );
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nkeynes@539 | 42 | }
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nkeynes@539 | 43 |
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nkeynes@539 | 44 | #define CALL_FUNC2_SIZE 12
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nkeynes@539 | 45 | static inline void call_func2( void *ptr, int arg1, int arg2 )
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nkeynes@539 | 46 | {
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nkeynes@539 | 47 | PUSH_r32(arg2);
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nkeynes@539 | 48 | PUSH_r32(arg1);
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nkeynes@539 | 49 | call_func0(ptr);
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nkeynes@539 | 50 | ADD_imm8s_r32( 8, R_ESP );
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nkeynes@539 | 51 | }
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nkeynes@539 | 52 |
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nkeynes@539 | 53 | /**
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nkeynes@539 | 54 | * Write a double (64-bit) value into memory, with the first word in arg2a, and
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nkeynes@539 | 55 | * the second in arg2b
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nkeynes@539 | 56 | * NB: 30 bytes
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nkeynes@539 | 57 | */
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nkeynes@539 | 58 | #define MEM_WRITE_DOUBLE_SIZE 30
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nkeynes@539 | 59 | static inline void MEM_WRITE_DOUBLE( int addr, int arg2a, int arg2b )
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nkeynes@539 | 60 | {
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nkeynes@539 | 61 | ADD_imm8s_r32( 4, addr );
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nkeynes@539 | 62 | PUSH_r32(arg2b);
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nkeynes@539 | 63 | PUSH_r32(addr);
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nkeynes@539 | 64 | ADD_imm8s_r32( -4, addr );
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nkeynes@539 | 65 | PUSH_r32(arg2a);
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nkeynes@539 | 66 | PUSH_r32(addr);
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nkeynes@539 | 67 | call_func0(sh4_write_long);
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nkeynes@539 | 68 | ADD_imm8s_r32( 8, R_ESP );
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nkeynes@539 | 69 | call_func0(sh4_write_long);
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nkeynes@539 | 70 | ADD_imm8s_r32( 8, R_ESP );
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nkeynes@539 | 71 | }
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nkeynes@539 | 72 |
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nkeynes@539 | 73 | /**
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nkeynes@539 | 74 | * Read a double (64-bit) value from memory, writing the first word into arg2a
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nkeynes@539 | 75 | * and the second into arg2b. The addr must not be in EAX
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nkeynes@539 | 76 | * NB: 27 bytes
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nkeynes@539 | 77 | */
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nkeynes@539 | 78 | #define MEM_READ_DOUBLE_SIZE 27
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nkeynes@539 | 79 | static inline void MEM_READ_DOUBLE( int addr, int arg2a, int arg2b )
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nkeynes@539 | 80 | {
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nkeynes@539 | 81 | PUSH_r32(addr);
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nkeynes@539 | 82 | call_func0(sh4_read_long);
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nkeynes@539 | 83 | POP_r32(addr);
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nkeynes@539 | 84 | PUSH_r32(R_EAX);
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nkeynes@539 | 85 | ADD_imm8s_r32( 4, addr );
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nkeynes@539 | 86 | PUSH_r32(addr);
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nkeynes@539 | 87 | call_func0(sh4_read_long);
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nkeynes@539 | 88 | ADD_imm8s_r32( 4, R_ESP );
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nkeynes@539 | 89 | MOV_r32_r32( R_EAX, arg2b );
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nkeynes@539 | 90 | POP_r32(arg2a);
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nkeynes@539 | 91 | }
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nkeynes@539 | 92 |
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nkeynes@539 | 93 | #define EXIT_BLOCK_SIZE 29
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nkeynes@539 | 94 |
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nkeynes@539 | 95 |
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nkeynes@539 | 96 | /**
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nkeynes@539 | 97 | * Emit the 'start of block' assembly. Sets up the stack frame and save
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nkeynes@539 | 98 | * SI/DI as required
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nkeynes@539 | 99 | */
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nkeynes@539 | 100 | void sh4_translate_begin_block( sh4addr_t pc )
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nkeynes@539 | 101 | {
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nkeynes@539 | 102 | PUSH_r32(R_EBP);
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nkeynes@539 | 103 | /* mov &sh4r, ebp */
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nkeynes@539 | 104 | load_ptr( R_EBP, &sh4r );
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nkeynes@539 | 105 |
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nkeynes@539 | 106 | sh4_x86.in_delay_slot = FALSE;
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nkeynes@539 | 107 | sh4_x86.priv_checked = FALSE;
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nkeynes@539 | 108 | sh4_x86.fpuen_checked = FALSE;
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nkeynes@539 | 109 | sh4_x86.branch_taken = FALSE;
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nkeynes@539 | 110 | sh4_x86.backpatch_posn = 0;
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nkeynes@539 | 111 | sh4_x86.block_start_pc = pc;
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nkeynes@570 | 112 | sh4_x86.tlb_on = MMIO_READ(MMU,MMUCR)&MMUCR_AT;
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nkeynes@539 | 113 | sh4_x86.tstate = TSTATE_NONE;
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nkeynes@539 | 114 | #ifdef STACK_ALIGN
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nkeynes@539 | 115 | sh4_x86.stack_posn = 8;
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nkeynes@539 | 116 | #endif
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nkeynes@539 | 117 | }
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nkeynes@539 | 118 |
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nkeynes@539 | 119 | /**
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nkeynes@539 | 120 | * Exit the block with sh4r.pc already written
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nkeynes@539 | 121 | * Bytes: 15
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nkeynes@539 | 122 | */
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nkeynes@569 | 123 | void exit_block_pcset( sh4addr_t pc )
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nkeynes@539 | 124 | {
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nkeynes@539 | 125 | load_imm32( R_ECX, ((pc - sh4_x86.block_start_pc)>>1)*sh4_cpu_period ); // 5
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nkeynes@539 | 126 | ADD_r32_sh4r( R_ECX, REG_OFFSET(slice_cycle) ); // 6
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nkeynes@539 | 127 | load_spreg( R_EAX, REG_OFFSET(pc) );
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nkeynes@570 | 128 | if( sh4_x86.tlb_on ) {
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nkeynes@570 | 129 | call_func1(xlat_get_code_by_vma,R_EAX);
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nkeynes@570 | 130 | } else {
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nkeynes@570 | 131 | call_func1(xlat_get_code,R_EAX);
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nkeynes@570 | 132 | }
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nkeynes@539 | 133 | POP_r32(R_EBP);
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nkeynes@539 | 134 | RET();
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nkeynes@539 | 135 | }
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nkeynes@539 | 136 |
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nkeynes@539 | 137 | /**
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nkeynes@539 | 138 | * Exit the block to an absolute PC
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nkeynes@539 | 139 | */
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nkeynes@539 | 140 | void exit_block( sh4addr_t pc, sh4addr_t endpc )
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nkeynes@539 | 141 | {
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nkeynes@539 | 142 | load_imm32( R_ECX, pc ); // 5
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nkeynes@539 | 143 | store_spreg( R_ECX, REG_OFFSET(pc) ); // 3
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nkeynes@539 | 144 | MOV_moff32_EAX( xlat_get_lut_entry(pc) ); // 5
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nkeynes@539 | 145 | AND_imm8s_r32( 0xFC, R_EAX ); // 3
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nkeynes@539 | 146 | load_imm32( R_ECX, ((endpc - sh4_x86.block_start_pc)>>1)*sh4_cpu_period ); // 5
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nkeynes@539 | 147 | ADD_r32_sh4r( R_ECX, REG_OFFSET(slice_cycle) ); // 6
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nkeynes@539 | 148 | POP_r32(R_EBP);
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nkeynes@539 | 149 | RET();
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nkeynes@539 | 150 | }
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nkeynes@539 | 151 |
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nkeynes@539 | 152 | /**
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nkeynes@539 | 153 | * Write the block trailer (exception handling block)
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nkeynes@539 | 154 | */
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nkeynes@539 | 155 | void sh4_translate_end_block( sh4addr_t pc ) {
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nkeynes@539 | 156 | if( sh4_x86.branch_taken == FALSE ) {
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nkeynes@539 | 157 | // Didn't exit unconditionally already, so write the termination here
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nkeynes@539 | 158 | exit_block( pc, pc );
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nkeynes@539 | 159 | }
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nkeynes@539 | 160 | if( sh4_x86.backpatch_posn != 0 ) {
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nkeynes@559 | 161 | unsigned int i;
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nkeynes@559 | 162 | // Raise exception
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nkeynes@539 | 163 | uint8_t *end_ptr = xlat_output;
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nkeynes@539 | 164 | load_spreg( R_ECX, REG_OFFSET(pc) );
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nkeynes@539 | 165 | ADD_r32_r32( R_EDX, R_ECX );
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nkeynes@539 | 166 | ADD_r32_r32( R_EDX, R_ECX );
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nkeynes@539 | 167 | store_spreg( R_ECX, REG_OFFSET(pc) );
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nkeynes@539 | 168 | MOV_moff32_EAX( &sh4_cpu_period );
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nkeynes@539 | 169 | MUL_r32( R_EDX );
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nkeynes@539 | 170 | ADD_r32_sh4r( R_EAX, REG_OFFSET(slice_cycle) );
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nkeynes@539 | 171 |
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nkeynes@539 | 172 | call_func0( sh4_raise_exception );
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nkeynes@539 | 173 | ADD_imm8s_r32( 4, R_ESP );
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nkeynes@539 | 174 | load_spreg( R_EAX, REG_OFFSET(pc) );
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nkeynes@570 | 175 | if( sh4_x86.tlb_on ) {
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nkeynes@570 | 176 | call_func1(xlat_get_code_by_vma,R_EAX);
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nkeynes@570 | 177 | } else {
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nkeynes@570 | 178 | call_func1(xlat_get_code,R_EAX);
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nkeynes@570 | 179 | }
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nkeynes@539 | 180 | POP_r32(R_EBP);
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nkeynes@539 | 181 | RET();
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nkeynes@539 | 182 |
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nkeynes@559 | 183 | // Exception already raised - just cleanup
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nkeynes@559 | 184 | uint8_t *preexc_ptr = xlat_output;
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nkeynes@559 | 185 | load_imm32( R_ECX, sh4_x86.block_start_pc );
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nkeynes@559 | 186 | ADD_r32_r32( R_EDX, R_ECX );
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nkeynes@559 | 187 | ADD_r32_r32( R_EDX, R_ECX );
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nkeynes@559 | 188 | store_spreg( R_ECX, REG_OFFSET(spc) );
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nkeynes@559 | 189 | MOV_moff32_EAX( &sh4_cpu_period );
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nkeynes@559 | 190 | MUL_r32( R_EDX );
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nkeynes@559 | 191 | ADD_r32_sh4r( R_EAX, REG_OFFSET(slice_cycle) );
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nkeynes@559 | 192 | load_spreg( R_EAX, REG_OFFSET(pc) );
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nkeynes@570 | 193 | if( sh4_x86.tlb_on ) {
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nkeynes@570 | 194 | call_func1(xlat_get_code_by_vma,R_EAX);
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nkeynes@570 | 195 | } else {
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nkeynes@570 | 196 | call_func1(xlat_get_code,R_EAX);
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nkeynes@570 | 197 | }
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nkeynes@559 | 198 | POP_r32(R_EBP);
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nkeynes@559 | 199 | RET();
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nkeynes@559 | 200 |
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nkeynes@559 | 201 | for( i=0; i< sh4_x86.backpatch_posn; i++ ) {
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nkeynes@559 | 202 | *sh4_x86.backpatch_list[i].fixup_addr =
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nkeynes@559 | 203 | xlat_output - ((uint8_t *)sh4_x86.backpatch_list[i].fixup_addr) - 4;
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nkeynes@559 | 204 | if( sh4_x86.backpatch_list[i].exc_code == -1 ) {
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nkeynes@559 | 205 | load_imm32( R_EDX, sh4_x86.backpatch_list[i].fixup_icount );
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nkeynes@559 | 206 | int rel = preexc_ptr - xlat_output;
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nkeynes@559 | 207 | JMP_rel(rel);
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nkeynes@559 | 208 | } else {
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nkeynes@559 | 209 | PUSH_imm32( sh4_x86.backpatch_list[i].exc_code );
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nkeynes@559 | 210 | load_imm32( R_EDX, sh4_x86.backpatch_list[i].fixup_icount );
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nkeynes@559 | 211 | int rel = end_ptr - xlat_output;
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nkeynes@559 | 212 | JMP_rel(rel);
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nkeynes@559 | 213 | }
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nkeynes@559 | 214 | }
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nkeynes@539 | 215 | }
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nkeynes@539 | 216 | }
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nkeynes@539 | 217 |
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nkeynes@539 | 218 | #endif
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nkeynes@539 | 219 |
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nkeynes@539 | 220 |
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