nkeynes@539 | 1 | /**
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nkeynes@586 | 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@736 | 20 | #ifndef lxdream_ia32abi_H
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nkeynes@736 | 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@586 | 83 | POP_r32(R_ECX);
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nkeynes@539 | 84 | PUSH_r32(R_EAX);
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nkeynes@586 | 85 | ADD_imm8s_r32( 4, R_ECX );
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nkeynes@586 | 86 | PUSH_r32(R_ECX);
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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 | /**
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nkeynes@539 | 94 | * Emit the 'start of block' assembly. Sets up the stack frame and save
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nkeynes@539 | 95 | * SI/DI as required
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nkeynes@539 | 96 | */
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nkeynes@901 | 97 | void enter_block( )
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nkeynes@539 | 98 | {
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nkeynes@539 | 99 | PUSH_r32(R_EBP);
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nkeynes@539 | 100 | /* mov &sh4r, ebp */
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nkeynes@669 | 101 | load_ptr( R_EBP, ((uint8_t *)&sh4r) + 128 );
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nkeynes@736 | 102 |
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nkeynes@539 | 103 | #ifdef STACK_ALIGN
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nkeynes@736 | 104 | sh4_x86.stack_posn = 8;
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nkeynes@539 | 105 | #endif
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nkeynes@539 | 106 | }
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nkeynes@539 | 107 |
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nkeynes@539 | 108 | /**
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nkeynes@539 | 109 | * Exit the block with sh4r.pc already written
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nkeynes@539 | 110 | */
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nkeynes@586 | 111 | void exit_block_pcset( sh4addr_t pc )
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nkeynes@539 | 112 | {
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nkeynes@539 | 113 | load_imm32( R_ECX, ((pc - sh4_x86.block_start_pc)>>1)*sh4_cpu_period ); // 5
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nkeynes@539 | 114 | ADD_r32_sh4r( R_ECX, REG_OFFSET(slice_cycle) ); // 6
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nkeynes@590 | 115 | load_spreg( R_EAX, R_PC );
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nkeynes@590 | 116 | if( sh4_x86.tlb_on ) {
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nkeynes@736 | 117 | call_func1(xlat_get_code_by_vma,R_EAX);
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nkeynes@590 | 118 | } else {
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nkeynes@736 | 119 | call_func1(xlat_get_code,R_EAX);
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nkeynes@590 | 120 | }
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nkeynes@590 | 121 | POP_r32(R_EBP);
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nkeynes@590 | 122 | RET();
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nkeynes@590 | 123 | }
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nkeynes@590 | 124 |
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nkeynes@590 | 125 | /**
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nkeynes@590 | 126 | * Exit the block with sh4r.new_pc written with the target pc
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nkeynes@590 | 127 | */
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nkeynes@590 | 128 | void exit_block_newpcset( sh4addr_t pc )
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nkeynes@590 | 129 | {
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nkeynes@590 | 130 | load_imm32( R_ECX, ((pc - sh4_x86.block_start_pc)>>1)*sh4_cpu_period ); // 5
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nkeynes@590 | 131 | ADD_r32_sh4r( R_ECX, REG_OFFSET(slice_cycle) ); // 6
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nkeynes@590 | 132 | load_spreg( R_EAX, R_NEW_PC );
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nkeynes@590 | 133 | store_spreg( R_EAX, R_PC );
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nkeynes@586 | 134 | if( sh4_x86.tlb_on ) {
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nkeynes@736 | 135 | call_func1(xlat_get_code_by_vma,R_EAX);
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nkeynes@586 | 136 | } else {
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nkeynes@736 | 137 | call_func1(xlat_get_code,R_EAX);
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nkeynes@586 | 138 | }
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nkeynes@539 | 139 | POP_r32(R_EBP);
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nkeynes@539 | 140 | RET();
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nkeynes@539 | 141 | }
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nkeynes@539 | 142 |
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nkeynes@586 | 143 | #define EXIT_BLOCK_SIZE(pc) (24 + (IS_IN_ICACHE(pc)?5:CALL_FUNC1_SIZE))
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nkeynes@586 | 144 |
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nkeynes@586 | 145 |
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nkeynes@539 | 146 | /**
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nkeynes@539 | 147 | * Exit the block to an absolute PC
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nkeynes@539 | 148 | */
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nkeynes@539 | 149 | void exit_block( sh4addr_t pc, sh4addr_t endpc )
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nkeynes@539 | 150 | {
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nkeynes@539 | 151 | load_imm32( R_ECX, pc ); // 5
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nkeynes@539 | 152 | store_spreg( R_ECX, REG_OFFSET(pc) ); // 3
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nkeynes@586 | 153 | if( IS_IN_ICACHE(pc) ) {
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nkeynes@736 | 154 | MOV_moff32_EAX( xlat_get_lut_entry(GET_ICACHE_PHYS(pc)) ); // 5
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nkeynes@586 | 155 | } else if( sh4_x86.tlb_on ) {
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nkeynes@736 | 156 | call_func1(xlat_get_code_by_vma,R_ECX);
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nkeynes@586 | 157 | } else {
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nkeynes@736 | 158 | call_func1(xlat_get_code,R_ECX);
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nkeynes@586 | 159 | }
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nkeynes@586 | 160 | AND_imm8s_r32( 0xFC, R_EAX ); // 3
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nkeynes@586 | 161 | load_imm32( R_ECX, ((endpc - sh4_x86.block_start_pc)>>1)*sh4_cpu_period ); // 5
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nkeynes@586 | 162 | ADD_r32_sh4r( R_ECX, REG_OFFSET(slice_cycle) ); // 6
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nkeynes@586 | 163 | POP_r32(R_EBP);
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nkeynes@586 | 164 | RET();
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nkeynes@586 | 165 | }
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nkeynes@586 | 166 |
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nkeynes@586 | 167 | #define EXIT_BLOCK_REL_SIZE(pc) (27 + (IS_IN_ICACHE(pc)?5:CALL_FUNC1_SIZE))
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nkeynes@586 | 168 |
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nkeynes@586 | 169 | /**
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nkeynes@586 | 170 | * Exit the block to a relative PC
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nkeynes@586 | 171 | */
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nkeynes@586 | 172 | void exit_block_rel( sh4addr_t pc, sh4addr_t endpc )
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nkeynes@586 | 173 | {
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nkeynes@586 | 174 | load_imm32( R_ECX, pc - sh4_x86.block_start_pc ); // 5
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nkeynes@586 | 175 | ADD_sh4r_r32( R_PC, R_ECX );
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nkeynes@586 | 176 | store_spreg( R_ECX, REG_OFFSET(pc) ); // 3
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nkeynes@586 | 177 | if( IS_IN_ICACHE(pc) ) {
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nkeynes@736 | 178 | MOV_moff32_EAX( xlat_get_lut_entry(GET_ICACHE_PHYS(pc)) ); // 5
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nkeynes@586 | 179 | } else if( sh4_x86.tlb_on ) {
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nkeynes@736 | 180 | call_func1(xlat_get_code_by_vma,R_ECX);
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nkeynes@586 | 181 | } else {
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nkeynes@736 | 182 | call_func1(xlat_get_code,R_ECX);
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nkeynes@586 | 183 | }
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nkeynes@539 | 184 | AND_imm8s_r32( 0xFC, R_EAX ); // 3
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nkeynes@539 | 185 | load_imm32( R_ECX, ((endpc - sh4_x86.block_start_pc)>>1)*sh4_cpu_period ); // 5
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nkeynes@539 | 186 | ADD_r32_sh4r( R_ECX, REG_OFFSET(slice_cycle) ); // 6
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nkeynes@539 | 187 | POP_r32(R_EBP);
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nkeynes@539 | 188 | RET();
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nkeynes@539 | 189 | }
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nkeynes@539 | 190 |
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nkeynes@539 | 191 | /**
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nkeynes@539 | 192 | * Write the block trailer (exception handling block)
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nkeynes@539 | 193 | */
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nkeynes@539 | 194 | void sh4_translate_end_block( sh4addr_t pc ) {
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nkeynes@539 | 195 | if( sh4_x86.branch_taken == FALSE ) {
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nkeynes@736 | 196 | // Didn't exit unconditionally already, so write the termination here
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nkeynes@736 | 197 | exit_block_rel( pc, pc );
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nkeynes@539 | 198 | }
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nkeynes@539 | 199 | if( sh4_x86.backpatch_posn != 0 ) {
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nkeynes@736 | 200 | unsigned int i;
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nkeynes@736 | 201 | // Raise exception
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nkeynes@736 | 202 | uint8_t *end_ptr = xlat_output;
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nkeynes@736 | 203 | MOV_r32_r32( R_EDX, R_ECX );
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nkeynes@736 | 204 | ADD_r32_r32( R_EDX, R_ECX );
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nkeynes@736 | 205 | ADD_r32_sh4r( R_ECX, R_PC );
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nkeynes@736 | 206 | MOV_moff32_EAX( &sh4_cpu_period );
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nkeynes@736 | 207 | MUL_r32( R_EDX );
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nkeynes@736 | 208 | ADD_r32_sh4r( R_EAX, REG_OFFSET(slice_cycle) );
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nkeynes@539 | 209 |
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nkeynes@736 | 210 | call_func0( sh4_raise_exception );
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nkeynes@736 | 211 | ADD_imm8s_r32( 4, R_ESP );
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nkeynes@736 | 212 | load_spreg( R_EAX, R_PC );
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nkeynes@736 | 213 | if( sh4_x86.tlb_on ) {
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nkeynes@736 | 214 | call_func1(xlat_get_code_by_vma,R_EAX);
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nkeynes@736 | 215 | } else {
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nkeynes@736 | 216 | call_func1(xlat_get_code,R_EAX);
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nkeynes@736 | 217 | }
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nkeynes@736 | 218 | POP_r32(R_EBP);
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nkeynes@736 | 219 | RET();
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nkeynes@539 | 220 |
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nkeynes@736 | 221 | // Exception already raised - just cleanup
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nkeynes@736 | 222 | uint8_t *preexc_ptr = xlat_output;
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nkeynes@736 | 223 | MOV_r32_r32( R_EDX, R_ECX );
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nkeynes@736 | 224 | ADD_r32_r32( R_EDX, R_ECX );
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nkeynes@736 | 225 | ADD_r32_sh4r( R_ECX, R_SPC );
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nkeynes@736 | 226 | MOV_moff32_EAX( &sh4_cpu_period );
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nkeynes@736 | 227 | MUL_r32( R_EDX );
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nkeynes@736 | 228 | ADD_r32_sh4r( R_EAX, REG_OFFSET(slice_cycle) );
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nkeynes@736 | 229 | load_spreg( R_EAX, R_PC );
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nkeynes@736 | 230 | if( sh4_x86.tlb_on ) {
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nkeynes@736 | 231 | call_func1(xlat_get_code_by_vma,R_EAX);
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nkeynes@736 | 232 | } else {
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nkeynes@736 | 233 | call_func1(xlat_get_code,R_EAX);
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nkeynes@736 | 234 | }
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nkeynes@736 | 235 | POP_r32(R_EBP);
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nkeynes@736 | 236 | RET();
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nkeynes@586 | 237 |
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nkeynes@736 | 238 | for( i=0; i< sh4_x86.backpatch_posn; i++ ) {
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nkeynes@736 | 239 | uint32_t *fixup_addr = (uint32_t *)&xlat_current_block->code[sh4_x86.backpatch_list[i].fixup_offset];
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nkeynes@736 | 240 | *fixup_addr = xlat_output - (uint8_t *)&xlat_current_block->code[sh4_x86.backpatch_list[i].fixup_offset] - 4;
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nkeynes@736 | 241 | if( sh4_x86.backpatch_list[i].exc_code < 0 ) {
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nkeynes@736 | 242 | load_imm32( R_EDX, sh4_x86.backpatch_list[i].fixup_icount );
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nkeynes@736 | 243 | int stack_adj = -1 - sh4_x86.backpatch_list[i].exc_code;
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nkeynes@736 | 244 | if( stack_adj > 0 ) {
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nkeynes@736 | 245 | ADD_imm8s_r32( stack_adj, R_ESP );
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nkeynes@736 | 246 | }
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nkeynes@736 | 247 | int rel = preexc_ptr - xlat_output;
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nkeynes@736 | 248 | JMP_rel(rel);
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nkeynes@736 | 249 | } else {
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nkeynes@736 | 250 | PUSH_imm32( sh4_x86.backpatch_list[i].exc_code );
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nkeynes@736 | 251 | load_imm32( R_EDX, sh4_x86.backpatch_list[i].fixup_icount );
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nkeynes@736 | 252 | int rel = end_ptr - xlat_output;
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nkeynes@736 | 253 | JMP_rel(rel);
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nkeynes@736 | 254 | }
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nkeynes@736 | 255 | }
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nkeynes@539 | 256 | }
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nkeynes@539 | 257 | }
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nkeynes@539 | 258 |
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nkeynes@899 | 259 | /**
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nkeynes@899 | 260 | * The unwind methods only work if we compiled with DWARF2 frame information
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nkeynes@899 | 261 | * (ie -fexceptions), otherwise we have to use the direct frame scan.
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nkeynes@899 | 262 | */
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nkeynes@899 | 263 | #ifdef HAVE_EXCEPTIONS
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nkeynes@899 | 264 | #include <unwind.h>
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nkeynes@899 | 265 |
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nkeynes@899 | 266 | struct UnwindInfo {
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nkeynes@899 | 267 | int have_result;
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nkeynes@899 | 268 | void *pc;
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nkeynes@899 | 269 | };
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nkeynes@899 | 270 |
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nkeynes@899 | 271 | _Unwind_Reason_Code xlat_check_frame( struct _Unwind_Context *context, void *arg )
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nkeynes@899 | 272 | {
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nkeynes@899 | 273 | void *ebp = (void *)_Unwind_GetGR(context, 5);
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nkeynes@899 | 274 | void *expect = (((uint8_t *)&sh4r) + 128 );
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nkeynes@899 | 275 | struct UnwindInfo *info = arg;
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nkeynes@899 | 276 | if( ebp == expect ) {
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nkeynes@899 | 277 | info->have_result = 1;
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nkeynes@899 | 278 | info->pc = (void *)_Unwind_GetIP(context);
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nkeynes@899 | 279 | } else if( info->have_result ) {
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nkeynes@899 | 280 | return _URC_NORMAL_STOP;
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nkeynes@899 | 281 | }
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nkeynes@899 | 282 |
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nkeynes@899 | 283 | return _URC_NO_REASON;
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nkeynes@899 | 284 | }
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nkeynes@899 | 285 |
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nkeynes@899 | 286 | void *xlat_get_native_pc()
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nkeynes@899 | 287 | {
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nkeynes@899 | 288 | struct _Unwind_Exception exc;
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nkeynes@899 | 289 | struct UnwindInfo info;
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nkeynes@899 | 290 |
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nkeynes@899 | 291 | info.have_result = 0;
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nkeynes@899 | 292 | void *result = NULL;
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nkeynes@899 | 293 | _Unwind_Backtrace( xlat_check_frame, &info );
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nkeynes@899 | 294 | if( info.have_result )
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nkeynes@899 | 295 | return info.pc;
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nkeynes@899 | 296 | return NULL;
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nkeynes@899 | 297 | }
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nkeynes@899 | 298 | #else
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nkeynes@586 | 299 | void *xlat_get_native_pc()
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nkeynes@586 | 300 | {
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nkeynes@586 | 301 | void *result = NULL;
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nkeynes@586 | 302 | asm(
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nkeynes@736 | 303 | "mov %%ebp, %%eax\n\t"
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nkeynes@736 | 304 | "mov $0x8, %%ecx\n\t"
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nkeynes@736 | 305 | "mov %1, %%edx\n"
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nkeynes@736 | 306 | "frame_loop: test %%eax, %%eax\n\t"
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nkeynes@736 | 307 | "je frame_not_found\n\t"
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nkeynes@736 | 308 | "cmp (%%eax), %%edx\n\t"
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nkeynes@736 | 309 | "je frame_found\n\t"
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nkeynes@736 | 310 | "sub $0x1, %%ecx\n\t"
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nkeynes@736 | 311 | "je frame_not_found\n\t"
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nkeynes@736 | 312 | "movl (%%eax), %%eax\n\t"
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nkeynes@736 | 313 | "jmp frame_loop\n"
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nkeynes@736 | 314 | "frame_found: movl 0x4(%%eax), %0\n"
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nkeynes@736 | 315 | "frame_not_found:"
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nkeynes@736 | 316 | : "=r" (result)
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nkeynes@736 | 317 | : "r" (((uint8_t *)&sh4r) + 128 )
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nkeynes@736 | 318 | : "eax", "ecx", "edx" );
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nkeynes@586 | 319 | return result;
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nkeynes@586 | 320 | }
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nkeynes@899 | 321 | #endif
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nkeynes@586 | 322 |
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nkeynes@736 | 323 | #endif /* !lxdream_ia32abi_H */
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nkeynes@539 | 324 |
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nkeynes@539 | 325 |
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