nkeynes@539: /**
nkeynes@586:  * $Id$
nkeynes@539:  * 
nkeynes@539:  * Provides the implementation for the ia32 ABI (eg prologue, epilogue, and
nkeynes@539:  * calling conventions)
nkeynes@539:  *
nkeynes@539:  * Copyright (c) 2007 Nathan Keynes.
nkeynes@539:  *
nkeynes@539:  * This program is free software; you can redistribute it and/or modify
nkeynes@539:  * it under the terms of the GNU General Public License as published by
nkeynes@539:  * the Free Software Foundation; either version 2 of the License, or
nkeynes@539:  * (at your option) any later version.
nkeynes@539:  *
nkeynes@539:  * This program is distributed in the hope that it will be useful,
nkeynes@539:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
nkeynes@539:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
nkeynes@539:  * GNU General Public License for more details.
nkeynes@539:  */
nkeynes@539: 
nkeynes@736: #ifndef lxdream_ia32abi_H
nkeynes@736: #define lxdream_ia32abi_H 1
nkeynes@539: 
nkeynes@539: #define load_ptr( reg, ptr ) load_imm32( reg, (uint32_t)ptr );
nkeynes@539: 
nkeynes@539: /**
nkeynes@539:  * Note: clobbers EAX to make the indirect call - this isn't usually
nkeynes@539:  * a problem since the callee will usually clobber it anyway.
nkeynes@539:  */
nkeynes@539: #define CALL_FUNC0_SIZE 7
nkeynes@539: static inline void call_func0( void *ptr )
nkeynes@539: {
nkeynes@539:     load_imm32(R_EAX, (uint32_t)ptr);
nkeynes@539:     CALL_r32(R_EAX);
nkeynes@539: }
nkeynes@539: 
nkeynes@539: #define CALL_FUNC1_SIZE 11
nkeynes@539: static inline void call_func1( void *ptr, int arg1 )
nkeynes@539: {
nkeynes@539:     PUSH_r32(arg1);
nkeynes@539:     call_func0(ptr);
nkeynes@539:     ADD_imm8s_r32( 4, R_ESP );
nkeynes@539: }
nkeynes@539: 
nkeynes@539: #define CALL_FUNC2_SIZE 12
nkeynes@539: static inline void call_func2( void *ptr, int arg1, int arg2 )
nkeynes@539: {
nkeynes@539:     PUSH_r32(arg2);
nkeynes@539:     PUSH_r32(arg1);
nkeynes@539:     call_func0(ptr);
nkeynes@539:     ADD_imm8s_r32( 8, R_ESP );
nkeynes@539: }
nkeynes@539: 
nkeynes@539: /**
nkeynes@539:  * Write a double (64-bit) value into memory, with the first word in arg2a, and
nkeynes@539:  * the second in arg2b
nkeynes@539:  * NB: 30 bytes
nkeynes@539:  */
nkeynes@539: #define MEM_WRITE_DOUBLE_SIZE 30
nkeynes@539: static inline void MEM_WRITE_DOUBLE( int addr, int arg2a, int arg2b )
nkeynes@539: {
nkeynes@539:     ADD_imm8s_r32( 4, addr );
nkeynes@539:     PUSH_r32(arg2b);
nkeynes@539:     PUSH_r32(addr);
nkeynes@539:     ADD_imm8s_r32( -4, addr );
nkeynes@539:     PUSH_r32(arg2a);
nkeynes@539:     PUSH_r32(addr);
nkeynes@539:     call_func0(sh4_write_long);
nkeynes@539:     ADD_imm8s_r32( 8, R_ESP );
nkeynes@539:     call_func0(sh4_write_long);
nkeynes@539:     ADD_imm8s_r32( 8, R_ESP );
nkeynes@539: }
nkeynes@539: 
nkeynes@539: /**
nkeynes@539:  * Read a double (64-bit) value from memory, writing the first word into arg2a
nkeynes@539:  * and the second into arg2b. The addr must not be in EAX
nkeynes@539:  * NB: 27 bytes
nkeynes@539:  */
nkeynes@539: #define MEM_READ_DOUBLE_SIZE 27
nkeynes@539: static inline void MEM_READ_DOUBLE( int addr, int arg2a, int arg2b )
nkeynes@539: {
nkeynes@539:     PUSH_r32(addr);
nkeynes@539:     call_func0(sh4_read_long);
nkeynes@586:     POP_r32(R_ECX);
nkeynes@539:     PUSH_r32(R_EAX);
nkeynes@586:     ADD_imm8s_r32( 4, R_ECX );
nkeynes@586:     PUSH_r32(R_ECX);
nkeynes@539:     call_func0(sh4_read_long);
nkeynes@539:     ADD_imm8s_r32( 4, R_ESP );
nkeynes@539:     MOV_r32_r32( R_EAX, arg2b );
nkeynes@539:     POP_r32(arg2a);
nkeynes@539: }
nkeynes@539: 
nkeynes@539: /**
nkeynes@539:  * Emit the 'start of block' assembly. Sets up the stack frame and save
nkeynes@539:  * SI/DI as required
nkeynes@539:  */
nkeynes@539: void sh4_translate_begin_block( sh4addr_t pc ) 
nkeynes@539: {
nkeynes@539:     PUSH_r32(R_EBP);
nkeynes@539:     /* mov &sh4r, ebp */
nkeynes@669:     load_ptr( R_EBP, ((uint8_t *)&sh4r) + 128 );
nkeynes@736: 
nkeynes@539:     sh4_x86.in_delay_slot = FALSE;
nkeynes@539:     sh4_x86.priv_checked = FALSE;
nkeynes@539:     sh4_x86.fpuen_checked = FALSE;
nkeynes@539:     sh4_x86.branch_taken = FALSE;
nkeynes@539:     sh4_x86.backpatch_posn = 0;
nkeynes@539:     sh4_x86.block_start_pc = pc;
nkeynes@586:     sh4_x86.tlb_on = IS_MMU_ENABLED();
nkeynes@539:     sh4_x86.tstate = TSTATE_NONE;
nkeynes@539: #ifdef STACK_ALIGN
nkeynes@736:     sh4_x86.stack_posn = 8;
nkeynes@539: #endif
nkeynes@539: }
nkeynes@539: 
nkeynes@539: /**
nkeynes@539:  * Exit the block with sh4r.pc already written
nkeynes@539:  */
nkeynes@586: void exit_block_pcset( sh4addr_t pc )
nkeynes@539: {
nkeynes@539:     load_imm32( R_ECX, ((pc - sh4_x86.block_start_pc)>>1)*sh4_cpu_period ); // 5
nkeynes@539:     ADD_r32_sh4r( R_ECX, REG_OFFSET(slice_cycle) );    // 6
nkeynes@590:     load_spreg( R_EAX, R_PC );
nkeynes@590:     if( sh4_x86.tlb_on ) {
nkeynes@736:         call_func1(xlat_get_code_by_vma,R_EAX);
nkeynes@590:     } else {
nkeynes@736:         call_func1(xlat_get_code,R_EAX);
nkeynes@590:     } 
nkeynes@590:     POP_r32(R_EBP);
nkeynes@590:     RET();
nkeynes@590: }
nkeynes@590: 
nkeynes@590: /**
nkeynes@590:  * Exit the block with sh4r.new_pc written with the target pc
nkeynes@590:  */
nkeynes@590: void exit_block_newpcset( sh4addr_t pc )
nkeynes@590: {
nkeynes@590:     load_imm32( R_ECX, ((pc - sh4_x86.block_start_pc)>>1)*sh4_cpu_period ); // 5
nkeynes@590:     ADD_r32_sh4r( R_ECX, REG_OFFSET(slice_cycle) );    // 6
nkeynes@590:     load_spreg( R_EAX, R_NEW_PC );
nkeynes@590:     store_spreg( R_EAX, R_PC );
nkeynes@586:     if( sh4_x86.tlb_on ) {
nkeynes@736:         call_func1(xlat_get_code_by_vma,R_EAX);
nkeynes@586:     } else {
nkeynes@736:         call_func1(xlat_get_code,R_EAX);
nkeynes@586:     } 
nkeynes@539:     POP_r32(R_EBP);
nkeynes@539:     RET();
nkeynes@539: }
nkeynes@539: 
nkeynes@586: #define EXIT_BLOCK_SIZE(pc)  (24 + (IS_IN_ICACHE(pc)?5:CALL_FUNC1_SIZE))
nkeynes@586: 
nkeynes@586: 
nkeynes@539: /**
nkeynes@539:  * Exit the block to an absolute PC
nkeynes@539:  */
nkeynes@539: void exit_block( sh4addr_t pc, sh4addr_t endpc )
nkeynes@539: {
nkeynes@539:     load_imm32( R_ECX, pc );                            // 5
nkeynes@539:     store_spreg( R_ECX, REG_OFFSET(pc) );               // 3
nkeynes@586:     if( IS_IN_ICACHE(pc) ) {
nkeynes@736:         MOV_moff32_EAX( xlat_get_lut_entry(GET_ICACHE_PHYS(pc)) ); // 5
nkeynes@586:     } else if( sh4_x86.tlb_on ) {
nkeynes@736:         call_func1(xlat_get_code_by_vma,R_ECX);
nkeynes@586:     } else {
nkeynes@736:         call_func1(xlat_get_code,R_ECX);
nkeynes@586:     }
nkeynes@586:     AND_imm8s_r32( 0xFC, R_EAX ); // 3
nkeynes@586:     load_imm32( R_ECX, ((endpc - sh4_x86.block_start_pc)>>1)*sh4_cpu_period ); // 5
nkeynes@586:     ADD_r32_sh4r( R_ECX, REG_OFFSET(slice_cycle) );     // 6
nkeynes@586:     POP_r32(R_EBP);
nkeynes@586:     RET();
nkeynes@586: }
nkeynes@586: 
nkeynes@586: #define EXIT_BLOCK_REL_SIZE(pc)  (27 + (IS_IN_ICACHE(pc)?5:CALL_FUNC1_SIZE))
nkeynes@586: 
nkeynes@586: /**
nkeynes@586:  * Exit the block to a relative PC
nkeynes@586:  */
nkeynes@586: void exit_block_rel( sh4addr_t pc, sh4addr_t endpc )
nkeynes@586: {
nkeynes@586:     load_imm32( R_ECX, pc - sh4_x86.block_start_pc );   // 5
nkeynes@586:     ADD_sh4r_r32( R_PC, R_ECX );
nkeynes@586:     store_spreg( R_ECX, REG_OFFSET(pc) );               // 3
nkeynes@586:     if( IS_IN_ICACHE(pc) ) {
nkeynes@736:         MOV_moff32_EAX( xlat_get_lut_entry(GET_ICACHE_PHYS(pc)) ); // 5
nkeynes@586:     } else if( sh4_x86.tlb_on ) {
nkeynes@736:         call_func1(xlat_get_code_by_vma,R_ECX);
nkeynes@586:     } else {
nkeynes@736:         call_func1(xlat_get_code,R_ECX);
nkeynes@586:     }
nkeynes@539:     AND_imm8s_r32( 0xFC, R_EAX ); // 3
nkeynes@539:     load_imm32( R_ECX, ((endpc - sh4_x86.block_start_pc)>>1)*sh4_cpu_period ); // 5
nkeynes@539:     ADD_r32_sh4r( R_ECX, REG_OFFSET(slice_cycle) );     // 6
nkeynes@539:     POP_r32(R_EBP);
nkeynes@539:     RET();
nkeynes@539: }
nkeynes@539: 
nkeynes@539: /**
nkeynes@539:  * Write the block trailer (exception handling block)
nkeynes@539:  */
nkeynes@539: void sh4_translate_end_block( sh4addr_t pc ) {
nkeynes@539:     if( sh4_x86.branch_taken == FALSE ) {
nkeynes@736:         // Didn't exit unconditionally already, so write the termination here
nkeynes@736:         exit_block_rel( pc, pc );
nkeynes@539:     }
nkeynes@539:     if( sh4_x86.backpatch_posn != 0 ) {
nkeynes@736:         unsigned int i;
nkeynes@736:         // Raise exception
nkeynes@736:         uint8_t *end_ptr = xlat_output;
nkeynes@736:         MOV_r32_r32( R_EDX, R_ECX );
nkeynes@736:         ADD_r32_r32( R_EDX, R_ECX );
nkeynes@736:         ADD_r32_sh4r( R_ECX, R_PC );
nkeynes@736:         MOV_moff32_EAX( &sh4_cpu_period );
nkeynes@736:         MUL_r32( R_EDX );
nkeynes@736:         ADD_r32_sh4r( R_EAX, REG_OFFSET(slice_cycle) );
nkeynes@539: 
nkeynes@736:         call_func0( sh4_raise_exception );
nkeynes@736:         ADD_imm8s_r32( 4, R_ESP );
nkeynes@736:         load_spreg( R_EAX, R_PC );
nkeynes@736:         if( sh4_x86.tlb_on ) {
nkeynes@736:             call_func1(xlat_get_code_by_vma,R_EAX);
nkeynes@736:         } else {
nkeynes@736:             call_func1(xlat_get_code,R_EAX);
nkeynes@736:         }
nkeynes@736:         POP_r32(R_EBP);
nkeynes@736:         RET();
nkeynes@539: 
nkeynes@736:         // Exception already raised - just cleanup
nkeynes@736:         uint8_t *preexc_ptr = xlat_output;
nkeynes@736:         MOV_r32_r32( R_EDX, R_ECX );
nkeynes@736:         ADD_r32_r32( R_EDX, R_ECX );
nkeynes@736:         ADD_r32_sh4r( R_ECX, R_SPC );
nkeynes@736:         MOV_moff32_EAX( &sh4_cpu_period );
nkeynes@736:         MUL_r32( R_EDX );
nkeynes@736:         ADD_r32_sh4r( R_EAX, REG_OFFSET(slice_cycle) );
nkeynes@736:         load_spreg( R_EAX, R_PC );
nkeynes@736:         if( sh4_x86.tlb_on ) {
nkeynes@736:             call_func1(xlat_get_code_by_vma,R_EAX);
nkeynes@736:         } else {
nkeynes@736:             call_func1(xlat_get_code,R_EAX);
nkeynes@736:         }
nkeynes@736:         POP_r32(R_EBP);
nkeynes@736:         RET();
nkeynes@586: 
nkeynes@736:         for( i=0; i< sh4_x86.backpatch_posn; i++ ) {
nkeynes@736:             uint32_t *fixup_addr = (uint32_t *)&xlat_current_block->code[sh4_x86.backpatch_list[i].fixup_offset];
nkeynes@736:             *fixup_addr = xlat_output - (uint8_t *)&xlat_current_block->code[sh4_x86.backpatch_list[i].fixup_offset] - 4;
nkeynes@736:             if( sh4_x86.backpatch_list[i].exc_code < 0 ) {
nkeynes@736:                 load_imm32( R_EDX, sh4_x86.backpatch_list[i].fixup_icount );
nkeynes@736:                 int stack_adj = -1 - sh4_x86.backpatch_list[i].exc_code;
nkeynes@736:                 if( stack_adj > 0 ) { 
nkeynes@736:                     ADD_imm8s_r32( stack_adj, R_ESP );
nkeynes@736:                 }
nkeynes@736:                 int rel = preexc_ptr - xlat_output;
nkeynes@736:                 JMP_rel(rel);
nkeynes@736:             } else {
nkeynes@736:                 PUSH_imm32( sh4_x86.backpatch_list[i].exc_code );
nkeynes@736:                 load_imm32( R_EDX, sh4_x86.backpatch_list[i].fixup_icount );
nkeynes@736:                 int rel = end_ptr - xlat_output;
nkeynes@736:                 JMP_rel(rel);
nkeynes@736:             }
nkeynes@736:         }
nkeynes@539:     }
nkeynes@539: }
nkeynes@539: 
nkeynes@899: /**
nkeynes@899:  * The unwind methods only work if we compiled with DWARF2 frame information
nkeynes@899:  * (ie -fexceptions), otherwise we have to use the direct frame scan.
nkeynes@899:  */
nkeynes@899: #ifdef HAVE_EXCEPTIONS
nkeynes@899: #include <unwind.h>
nkeynes@899: 
nkeynes@899: struct UnwindInfo {
nkeynes@899: 	int have_result;
nkeynes@899: 	void *pc;
nkeynes@899: };
nkeynes@899: 
nkeynes@899: _Unwind_Reason_Code xlat_check_frame( struct _Unwind_Context *context, void *arg )
nkeynes@899: {
nkeynes@899:     void *ebp = (void *)_Unwind_GetGR(context, 5);
nkeynes@899:     void *expect = (((uint8_t *)&sh4r) + 128 );
nkeynes@899: 	struct UnwindInfo *info = arg;
nkeynes@899:     if( ebp == expect ) { 
nkeynes@899:         info->have_result = 1;
nkeynes@899:         info->pc = (void *)_Unwind_GetIP(context);
nkeynes@899:     } else if( info->have_result ) {
nkeynes@899:         return _URC_NORMAL_STOP;
nkeynes@899:     }
nkeynes@899: 
nkeynes@899:     return _URC_NO_REASON;
nkeynes@899: }
nkeynes@899: 
nkeynes@899: void *xlat_get_native_pc()
nkeynes@899: {
nkeynes@899:     struct _Unwind_Exception exc;
nkeynes@899:     struct UnwindInfo info;
nkeynes@899: 
nkeynes@899:     info.have_result = 0;
nkeynes@899:     void *result = NULL;
nkeynes@899:     _Unwind_Backtrace( xlat_check_frame, &info );
nkeynes@899:     if( info.have_result )
nkeynes@899:     	return info.pc;
nkeynes@899:     return NULL;
nkeynes@899: }
nkeynes@899: #else 
nkeynes@586: void *xlat_get_native_pc()
nkeynes@586: {
nkeynes@586:     void *result = NULL;
nkeynes@586:     asm(
nkeynes@736:         "mov %%ebp, %%eax\n\t"
nkeynes@736:         "mov $0x8, %%ecx\n\t"
nkeynes@736:         "mov %1, %%edx\n"
nkeynes@736:         "frame_loop: test %%eax, %%eax\n\t"
nkeynes@736:         "je frame_not_found\n\t"
nkeynes@736:         "cmp (%%eax), %%edx\n\t"
nkeynes@736:         "je frame_found\n\t"
nkeynes@736:         "sub $0x1, %%ecx\n\t"
nkeynes@736:         "je frame_not_found\n\t"
nkeynes@736:         "movl (%%eax), %%eax\n\t"
nkeynes@736:         "jmp frame_loop\n"
nkeynes@736:         "frame_found: movl 0x4(%%eax), %0\n"
nkeynes@736:         "frame_not_found:"
nkeynes@736:         : "=r" (result)
nkeynes@736:         : "r" (((uint8_t *)&sh4r) + 128 )
nkeynes@736:         : "eax", "ecx", "edx" );
nkeynes@586:     return result;
nkeynes@586: }
nkeynes@899: #endif
nkeynes@586: 
nkeynes@736: #endif /* !lxdream_ia32abi_H */
nkeynes@539: 
nkeynes@539: