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lxdream.org :: lxdream/src/sh4/ia64abi.h
lxdream 0.9.1
released Jun 29
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filename src/sh4/ia64abi.h
changeset 908:a00debcf2600
prev901:32c5cf5e206f
next926:68f3e0fe02f1
author nkeynes
date Thu Oct 30 05:50:21 2008 +0000 (11 years ago)
permissions -rw-r--r--
last change Fix x86-64 build (typos et al)
Remove Push/pop ebx - don't really need it and saves adding more target-specific asm
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     1 /**
     2  * $Id$
     3  * 
     4  * Provides the implementation for the AMD64 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_ia64abi_H
    21 #define lxdream_ia64abi_H 1
    23 #include <unwind.h>
    25 #define load_ptr( reg, ptr ) load_imm64( reg, (uint64_t)ptr );
    27 /**
    28  * Note: clobbers EAX to make the indirect call - this isn't usually
    29  * a problem since the callee will usually clobber it anyway.
    30  * Size: 12 bytes
    31  */
    32 #define CALL_FUNC0_SIZE 12
    33 static inline void call_func0( void *ptr )
    34 {
    35     load_imm64(R_EAX, (uint64_t)ptr);
    36     CALL_r32(R_EAX);
    37 }
    39 #define CALL_FUNC1_SIZE 14
    40 static inline void call_func1( void *ptr, int arg1 )
    41 {
    42     REXW(); MOV_r32_r32(arg1, R_EDI);
    43     call_func0(ptr);
    44 }
    46 #define CALL_FUNC2_SIZE 16
    47 static inline void call_func2( void *ptr, int arg1, int arg2 )
    48 {
    49     REXW(); MOV_r32_r32(arg1, R_EDI);
    50     REXW(); MOV_r32_r32(arg2, R_ESI);
    51     call_func0(ptr);
    52 }
    54 #define MEM_WRITE_DOUBLE_SIZE 35
    55 /**
    56  * Write a double (64-bit) value into memory, with the first word in arg2a, and
    57  * the second in arg2b
    58  */
    59 static inline void MEM_WRITE_DOUBLE( int addr, int arg2a, int arg2b )
    60 {
    61     PUSH_r32(arg2b);
    62     PUSH_r32(addr);
    63     call_func2(sh4_write_long, addr, arg2a);
    64     POP_r32(R_EDI);
    65     POP_r32(R_ESI);
    66     ADD_imm8s_r32(4, R_EDI);
    67     call_func0(sh4_write_long);
    68 }
    70 #define MEM_READ_DOUBLE_SIZE 43
    71 /**
    72  * Read a double (64-bit) value from memory, writing the first word into arg2a
    73  * and the second into arg2b. The addr must not be in EAX
    74  */
    75 static inline void MEM_READ_DOUBLE( int addr, int arg2a, int arg2b )
    76 {
    77     REXW(); SUB_imm8s_r32( 8, R_ESP );
    78     PUSH_r32(addr);
    79     call_func1(sh4_read_long, addr);
    80     POP_r32(R_EDI);
    81     PUSH_r32(R_EAX);
    82     ADD_imm8s_r32(4, R_EDI);
    83     call_func0(sh4_read_long);
    84     MOV_r32_r32(R_EAX, arg2b);
    85     POP_r32(arg2a);
    86     REXW(); ADD_imm8s_r32( 8, R_ESP );
    87 }
    90 /**
    91  * Emit the 'start of block' assembly. Sets up the stack frame and save
    92  * SI/DI as required
    93  */
    94 void enter_block( ) 
    95 {
    96     PUSH_r32(R_EBP);
    97     /* mov &sh4r, ebp */
    98     load_ptr( R_EBP, ((uint8_t *)&sh4r) + 128 );
    99 }
   101 /**
   102  * Exit the block with sh4r.pc already written
   103  */
   104 void exit_block_pcset( sh4addr_t pc )
   105 {
   106     load_imm32( R_ECX, ((pc - sh4_x86.block_start_pc)>>1)*sh4_cpu_period ); // 5
   107     ADD_r32_sh4r( R_ECX, REG_OFFSET(slice_cycle) );    // 6
   108     load_spreg( R_EAX, R_PC );
   109     if( sh4_x86.tlb_on ) {
   110         call_func1(xlat_get_code_by_vma,R_EAX);
   111     } else {
   112         call_func1(xlat_get_code,R_EAX);
   113     }
   114     POP_r32(R_EBP);
   115     RET();
   116 }
   118 /**
   119  * Exit the block with sh4r.new_pc written with the target address
   120  */
   121 void exit_block_newpcset( sh4addr_t pc )
   122 {
   123     load_imm32( R_ECX, ((pc - sh4_x86.block_start_pc)>>1)*sh4_cpu_period ); // 5
   124     ADD_r32_sh4r( R_ECX, REG_OFFSET(slice_cycle) );    // 6
   125     load_spreg( R_EAX, R_NEW_PC );
   126     store_spreg( R_EAX, R_PC );
   127     if( sh4_x86.tlb_on ) {
   128         call_func1(xlat_get_code_by_vma,R_EAX);
   129     } else {
   130         call_func1(xlat_get_code,R_EAX);
   131     }
   132     POP_r32(R_EBP);
   133     RET();
   134 }
   136 #define EXIT_BLOCK_SIZE(pc) (25 + (IS_IN_ICACHE(pc)?10:CALL_FUNC1_SIZE))
   137 /**
   138  * Exit the block to an absolute PC
   139  */
   140 void exit_block( sh4addr_t pc, sh4addr_t endpc )
   141 {
   142     load_imm32( R_ECX, pc );                            // 5
   143     store_spreg( R_ECX, REG_OFFSET(pc) );               // 3
   144     if( IS_IN_ICACHE(pc) ) {
   145         REXW(); MOV_moff32_EAX( xlat_get_lut_entry(pc) );
   146     } else if( sh4_x86.tlb_on ) {
   147         call_func1(xlat_get_code_by_vma, R_ECX);
   148     } else {
   149         call_func1(xlat_get_code,R_ECX);
   150     }
   151     REXW(); AND_imm8s_r32( 0xFC, R_EAX ); // 4
   152     load_imm32( R_ECX, ((endpc - sh4_x86.block_start_pc)>>1)*sh4_cpu_period ); // 5
   153     ADD_r32_sh4r( R_ECX, REG_OFFSET(slice_cycle) );     // 6
   154     POP_r32(R_EBP);
   155     RET();
   156 }
   159 #define EXIT_BLOCK_REL_SIZE(pc)  (28 + (IS_IN_ICACHE(pc)?10:CALL_FUNC1_SIZE))
   161 /**
   162  * Exit the block to a relative PC
   163  */
   164 void exit_block_rel( sh4addr_t pc, sh4addr_t endpc )
   165 {
   166     load_imm32( R_ECX, pc - sh4_x86.block_start_pc );   // 5
   167     ADD_sh4r_r32( R_PC, R_ECX );
   168     store_spreg( R_ECX, REG_OFFSET(pc) );               // 3
   169     if( IS_IN_ICACHE(pc) ) {
   170         REXW(); MOV_moff32_EAX( xlat_get_lut_entry(GET_ICACHE_PHYS(pc)) ); // 5
   171     } else if( sh4_x86.tlb_on ) {
   172         call_func1(xlat_get_code_by_vma,R_ECX);
   173     } else {
   174         call_func1(xlat_get_code,R_ECX);
   175     }
   176     REXW(); AND_imm8s_r32( 0xFC, R_EAX ); // 4
   177     load_imm32( R_ECX, ((endpc - sh4_x86.block_start_pc)>>1)*sh4_cpu_period ); // 5
   178     ADD_r32_sh4r( R_ECX, REG_OFFSET(slice_cycle) );     // 6
   179     POP_r32(R_EBP);
   180     RET();
   181 }
   183 /**
   184  * Write the block trailer (exception handling block)
   185  */
   186 void sh4_translate_end_block( sh4addr_t pc ) {
   187     if( sh4_x86.branch_taken == FALSE ) {
   188         // Didn't exit unconditionally already, so write the termination here
   189         exit_block_rel( pc, pc );
   190     }
   191     if( sh4_x86.backpatch_posn != 0 ) {
   192         unsigned int i;
   193         // Raise exception
   194         uint8_t *end_ptr = xlat_output;
   195         MOV_r32_r32( R_EDX, R_ECX );
   196         ADD_r32_r32( R_EDX, R_ECX );
   197         ADD_r32_sh4r( R_ECX, R_PC );
   198         MOV_moff32_EAX( &sh4_cpu_period );
   199         MUL_r32( R_EDX );
   200         ADD_r32_sh4r( R_EAX, REG_OFFSET(slice_cycle) );
   202         call_func0( sh4_raise_exception );
   203         load_spreg( R_EAX, R_PC );
   204         if( sh4_x86.tlb_on ) {
   205             call_func1(xlat_get_code_by_vma,R_EAX);
   206         } else {
   207             call_func1(xlat_get_code,R_EAX);
   208         }
   209         POP_r32(R_EBP);
   210         RET();
   212         // Exception already raised - just cleanup
   213         uint8_t *preexc_ptr = xlat_output;
   214         MOV_r32_r32( R_EDX, R_ECX );
   215         ADD_r32_r32( R_EDX, R_ECX );
   216         ADD_r32_sh4r( R_ECX, R_SPC );
   217         MOV_moff32_EAX( &sh4_cpu_period );
   218         MUL_r32( R_EDX );
   219         ADD_r32_sh4r( R_EAX, REG_OFFSET(slice_cycle) );
   220         load_spreg( R_EDI, R_PC );
   221         if( sh4_x86.tlb_on ) {
   222             call_func0(xlat_get_code_by_vma);
   223         } else {
   224             call_func0(xlat_get_code);
   225         }
   226         POP_r32(R_EBP);
   227         RET();
   229         for( i=0; i< sh4_x86.backpatch_posn; i++ ) {
   230             uint32_t *fixup_addr = (uint32_t *)&xlat_current_block->code[sh4_x86.backpatch_list[i].fixup_offset];
   231             *fixup_addr = xlat_output - (uint8_t *)&xlat_current_block->code[sh4_x86.backpatch_list[i].fixup_offset] - 4;
   232             if( sh4_x86.backpatch_list[i].exc_code < 0 ) {
   233                 load_imm32( R_EDX, sh4_x86.backpatch_list[i].fixup_icount );
   234                 int stack_adj = -1 - sh4_x86.backpatch_list[i].exc_code;
   235                 if( stack_adj > 0 ) { 
   236                     ADD_imm8s_r32( stack_adj*4, R_ESP );
   237                 }
   238                 int rel = preexc_ptr - xlat_output;
   239                 JMP_rel(rel);
   240             } else {
   241                 load_imm32( R_EDI, sh4_x86.backpatch_list[i].exc_code );
   242                 load_imm32( R_EDX, sh4_x86.backpatch_list[i].fixup_icount );
   243                 int rel = end_ptr - xlat_output;
   244                 JMP_rel(rel);
   245             }
   246         }
   247     }
   248 }
   250 _Unwind_Reason_Code xlat_check_frame( struct _Unwind_Context *context, void *arg )
   251 {
   252     void *rbp = (void *)_Unwind_GetGR(context, 6);
   253     void *expect = (((uint8_t *)&sh4r) + 128 );
   254     if( rbp == expect ) { 
   255         void **result = (void **)arg;
   256         *result = (void *)_Unwind_GetIP(context);
   257         return _URC_NORMAL_STOP;
   258     }
   260     return _URC_NO_REASON;
   261 }
   263 void *xlat_get_native_pc( void *code, uint32_t size )
   264 {
   265     struct _Unwind_Exception exc;
   267     void *result = NULL;
   268     _Unwind_Backtrace( xlat_check_frame, &result );
   269     return result;
   270 }
   272 #endif /* !lxdream_ia64abi_H */
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