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lxdream.org :: lxdream/src/sh4/ia32abi.h
lxdream 0.9.1
released Jun 29
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filename src/sh4/ia32abi.h
changeset 736:a02d1475ccfd
prev669:ab344e42bca9
next899:18e0cdea76aa
author nkeynes
date Mon Aug 04 06:00:11 2008 +0000 (12 years ago)
permissions -rw-r--r--
last change Fix x86-64 bugs (only visible on OS X)
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     1 /**
     2  * $Id$
     3  * 
     4  * Provides the implementation for the ia32 ABI (eg prologue, epilogue, and
     5  * calling conventions)
     6  *
     7  * Copyright (c) 2007 Nathan Keynes.
     8  *
     9  * This program is free software; you can redistribute it and/or modify
    10  * it under the terms of the GNU General Public License as published by
    11  * the Free Software Foundation; either version 2 of the License, or
    12  * (at your option) any later version.
    13  *
    14  * This program is distributed in the hope that it will be useful,
    15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
    16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    17  * GNU General Public License for more details.
    18  */
    20 #ifndef lxdream_ia32abi_H
    21 #define lxdream_ia32abi_H 1
    23 #define load_ptr( reg, ptr ) load_imm32( reg, (uint32_t)ptr );
    25 /**
    26  * Note: clobbers EAX to make the indirect call - this isn't usually
    27  * a problem since the callee will usually clobber it anyway.
    28  */
    29 #define CALL_FUNC0_SIZE 7
    30 static inline void call_func0( void *ptr )
    31 {
    32     load_imm32(R_EAX, (uint32_t)ptr);
    33     CALL_r32(R_EAX);
    34 }
    36 #define CALL_FUNC1_SIZE 11
    37 static inline void call_func1( void *ptr, int arg1 )
    38 {
    39     PUSH_r32(arg1);
    40     call_func0(ptr);
    41     ADD_imm8s_r32( 4, R_ESP );
    42 }
    44 #define CALL_FUNC2_SIZE 12
    45 static inline void call_func2( void *ptr, int arg1, int arg2 )
    46 {
    47     PUSH_r32(arg2);
    48     PUSH_r32(arg1);
    49     call_func0(ptr);
    50     ADD_imm8s_r32( 8, R_ESP );
    51 }
    53 /**
    54  * Write a double (64-bit) value into memory, with the first word in arg2a, and
    55  * the second in arg2b
    56  * NB: 30 bytes
    57  */
    58 #define MEM_WRITE_DOUBLE_SIZE 30
    59 static inline void MEM_WRITE_DOUBLE( int addr, int arg2a, int arg2b )
    60 {
    61     ADD_imm8s_r32( 4, addr );
    62     PUSH_r32(arg2b);
    63     PUSH_r32(addr);
    64     ADD_imm8s_r32( -4, addr );
    65     PUSH_r32(arg2a);
    66     PUSH_r32(addr);
    67     call_func0(sh4_write_long);
    68     ADD_imm8s_r32( 8, R_ESP );
    69     call_func0(sh4_write_long);
    70     ADD_imm8s_r32( 8, R_ESP );
    71 }
    73 /**
    74  * Read a double (64-bit) value from memory, writing the first word into arg2a
    75  * and the second into arg2b. The addr must not be in EAX
    76  * NB: 27 bytes
    77  */
    78 #define MEM_READ_DOUBLE_SIZE 27
    79 static inline void MEM_READ_DOUBLE( int addr, int arg2a, int arg2b )
    80 {
    81     PUSH_r32(addr);
    82     call_func0(sh4_read_long);
    83     POP_r32(R_ECX);
    84     PUSH_r32(R_EAX);
    85     ADD_imm8s_r32( 4, R_ECX );
    86     PUSH_r32(R_ECX);
    87     call_func0(sh4_read_long);
    88     ADD_imm8s_r32( 4, R_ESP );
    89     MOV_r32_r32( R_EAX, arg2b );
    90     POP_r32(arg2a);
    91 }
    93 /**
    94  * Emit the 'start of block' assembly. Sets up the stack frame and save
    95  * SI/DI as required
    96  */
    97 void sh4_translate_begin_block( sh4addr_t pc ) 
    98 {
    99     PUSH_r32(R_EBP);
   100     /* mov &sh4r, ebp */
   101     load_ptr( R_EBP, ((uint8_t *)&sh4r) + 128 );
   103     sh4_x86.in_delay_slot = FALSE;
   104     sh4_x86.priv_checked = FALSE;
   105     sh4_x86.fpuen_checked = FALSE;
   106     sh4_x86.branch_taken = FALSE;
   107     sh4_x86.backpatch_posn = 0;
   108     sh4_x86.block_start_pc = pc;
   109     sh4_x86.tlb_on = IS_MMU_ENABLED();
   110     sh4_x86.tstate = TSTATE_NONE;
   111 #ifdef STACK_ALIGN
   112     sh4_x86.stack_posn = 8;
   113 #endif
   114 }
   116 /**
   117  * Exit the block with sh4r.pc already written
   118  */
   119 void exit_block_pcset( sh4addr_t pc )
   120 {
   121     load_imm32( R_ECX, ((pc - sh4_x86.block_start_pc)>>1)*sh4_cpu_period ); // 5
   122     ADD_r32_sh4r( R_ECX, REG_OFFSET(slice_cycle) );    // 6
   123     load_spreg( R_EAX, R_PC );
   124     if( sh4_x86.tlb_on ) {
   125         call_func1(xlat_get_code_by_vma,R_EAX);
   126     } else {
   127         call_func1(xlat_get_code,R_EAX);
   128     } 
   129     POP_r32(R_EBP);
   130     RET();
   131 }
   133 /**
   134  * Exit the block with sh4r.new_pc written with the target pc
   135  */
   136 void exit_block_newpcset( sh4addr_t pc )
   137 {
   138     load_imm32( R_ECX, ((pc - sh4_x86.block_start_pc)>>1)*sh4_cpu_period ); // 5
   139     ADD_r32_sh4r( R_ECX, REG_OFFSET(slice_cycle) );    // 6
   140     load_spreg( R_EAX, R_NEW_PC );
   141     store_spreg( R_EAX, R_PC );
   142     if( sh4_x86.tlb_on ) {
   143         call_func1(xlat_get_code_by_vma,R_EAX);
   144     } else {
   145         call_func1(xlat_get_code,R_EAX);
   146     } 
   147     POP_r32(R_EBP);
   148     RET();
   149 }
   151 #define EXIT_BLOCK_SIZE(pc)  (24 + (IS_IN_ICACHE(pc)?5:CALL_FUNC1_SIZE))
   154 /**
   155  * Exit the block to an absolute PC
   156  */
   157 void exit_block( sh4addr_t pc, sh4addr_t endpc )
   158 {
   159     load_imm32( R_ECX, pc );                            // 5
   160     store_spreg( R_ECX, REG_OFFSET(pc) );               // 3
   161     if( IS_IN_ICACHE(pc) ) {
   162         MOV_moff32_EAX( xlat_get_lut_entry(GET_ICACHE_PHYS(pc)) ); // 5
   163     } else if( sh4_x86.tlb_on ) {
   164         call_func1(xlat_get_code_by_vma,R_ECX);
   165     } else {
   166         call_func1(xlat_get_code,R_ECX);
   167     }
   168     AND_imm8s_r32( 0xFC, R_EAX ); // 3
   169     load_imm32( R_ECX, ((endpc - sh4_x86.block_start_pc)>>1)*sh4_cpu_period ); // 5
   170     ADD_r32_sh4r( R_ECX, REG_OFFSET(slice_cycle) );     // 6
   171     POP_r32(R_EBP);
   172     RET();
   173 }
   175 #define EXIT_BLOCK_REL_SIZE(pc)  (27 + (IS_IN_ICACHE(pc)?5:CALL_FUNC1_SIZE))
   177 /**
   178  * Exit the block to a relative PC
   179  */
   180 void exit_block_rel( sh4addr_t pc, sh4addr_t endpc )
   181 {
   182     load_imm32( R_ECX, pc - sh4_x86.block_start_pc );   // 5
   183     ADD_sh4r_r32( R_PC, R_ECX );
   184     store_spreg( R_ECX, REG_OFFSET(pc) );               // 3
   185     if( IS_IN_ICACHE(pc) ) {
   186         MOV_moff32_EAX( xlat_get_lut_entry(GET_ICACHE_PHYS(pc)) ); // 5
   187     } else if( sh4_x86.tlb_on ) {
   188         call_func1(xlat_get_code_by_vma,R_ECX);
   189     } else {
   190         call_func1(xlat_get_code,R_ECX);
   191     }
   192     AND_imm8s_r32( 0xFC, R_EAX ); // 3
   193     load_imm32( R_ECX, ((endpc - sh4_x86.block_start_pc)>>1)*sh4_cpu_period ); // 5
   194     ADD_r32_sh4r( R_ECX, REG_OFFSET(slice_cycle) );     // 6
   195     POP_r32(R_EBP);
   196     RET();
   197 }
   199 /**
   200  * Write the block trailer (exception handling block)
   201  */
   202 void sh4_translate_end_block( sh4addr_t pc ) {
   203     if( sh4_x86.branch_taken == FALSE ) {
   204         // Didn't exit unconditionally already, so write the termination here
   205         exit_block_rel( pc, pc );
   206     }
   207     if( sh4_x86.backpatch_posn != 0 ) {
   208         unsigned int i;
   209         // Raise exception
   210         uint8_t *end_ptr = xlat_output;
   211         MOV_r32_r32( R_EDX, R_ECX );
   212         ADD_r32_r32( R_EDX, R_ECX );
   213         ADD_r32_sh4r( R_ECX, R_PC );
   214         MOV_moff32_EAX( &sh4_cpu_period );
   215         MUL_r32( R_EDX );
   216         ADD_r32_sh4r( R_EAX, REG_OFFSET(slice_cycle) );
   218         call_func0( sh4_raise_exception );
   219         ADD_imm8s_r32( 4, R_ESP );
   220         load_spreg( R_EAX, R_PC );
   221         if( sh4_x86.tlb_on ) {
   222             call_func1(xlat_get_code_by_vma,R_EAX);
   223         } else {
   224             call_func1(xlat_get_code,R_EAX);
   225         }
   226         POP_r32(R_EBP);
   227         RET();
   229         // Exception already raised - just cleanup
   230         uint8_t *preexc_ptr = xlat_output;
   231         MOV_r32_r32( R_EDX, R_ECX );
   232         ADD_r32_r32( R_EDX, R_ECX );
   233         ADD_r32_sh4r( R_ECX, R_SPC );
   234         MOV_moff32_EAX( &sh4_cpu_period );
   235         MUL_r32( R_EDX );
   236         ADD_r32_sh4r( R_EAX, REG_OFFSET(slice_cycle) );
   237         load_spreg( R_EAX, R_PC );
   238         if( sh4_x86.tlb_on ) {
   239             call_func1(xlat_get_code_by_vma,R_EAX);
   240         } else {
   241             call_func1(xlat_get_code,R_EAX);
   242         }
   243         POP_r32(R_EBP);
   244         RET();
   246         for( i=0; i< sh4_x86.backpatch_posn; i++ ) {
   247             uint32_t *fixup_addr = (uint32_t *)&xlat_current_block->code[sh4_x86.backpatch_list[i].fixup_offset];
   248             *fixup_addr = xlat_output - (uint8_t *)&xlat_current_block->code[sh4_x86.backpatch_list[i].fixup_offset] - 4;
   249             if( sh4_x86.backpatch_list[i].exc_code < 0 ) {
   250                 load_imm32( R_EDX, sh4_x86.backpatch_list[i].fixup_icount );
   251                 int stack_adj = -1 - sh4_x86.backpatch_list[i].exc_code;
   252                 if( stack_adj > 0 ) { 
   253                     ADD_imm8s_r32( stack_adj, R_ESP );
   254                 }
   255                 int rel = preexc_ptr - xlat_output;
   256                 JMP_rel(rel);
   257             } else {
   258                 PUSH_imm32( sh4_x86.backpatch_list[i].exc_code );
   259                 load_imm32( R_EDX, sh4_x86.backpatch_list[i].fixup_icount );
   260                 int rel = end_ptr - xlat_output;
   261                 JMP_rel(rel);
   262             }
   263         }
   264     }
   265 }
   267 void *xlat_get_native_pc()
   268 {
   269     void *result = NULL;
   270     asm(
   271         "mov %%ebp, %%eax\n\t"
   272         "mov $0x8, %%ecx\n\t"
   273         "mov %1, %%edx\n"
   274         "frame_loop: test %%eax, %%eax\n\t"
   275         "je frame_not_found\n\t"
   276         "cmp (%%eax), %%edx\n\t"
   277         "je frame_found\n\t"
   278         "sub $0x1, %%ecx\n\t"
   279         "je frame_not_found\n\t"
   280         "movl (%%eax), %%eax\n\t"
   281         "jmp frame_loop\n"
   282         "frame_found: movl 0x4(%%eax), %0\n"
   283         "frame_not_found:"
   284         : "=r" (result)
   285         : "r" (((uint8_t *)&sh4r) + 128 )
   286         : "eax", "ecx", "edx" );
   287     return result;
   288 }
   290 #endif /* !lxdream_ia32abi_H */
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