lxdream 0.9.1| filename | src/sh4/sh4x86.c |
| changeset | 409:549e00835448 |
| prev | 408:af496b734734 |
| next | 416:714df603c869 |
| author | nkeynes |
| date | Sat Sep 29 05:33:02 2007 +0000 (16 years ago) |
| permissions | -rw-r--r-- |
| last change | Modify termination again to allow early exit (eg on end-of-page), as well as allowing follow through on conditional branches if desired. |
| file | annotate | diff | log | raw |
1.1 --- a/src/sh4/sh4x86.c Fri Sep 28 07:27:20 2007 +00001.2 +++ b/src/sh4/sh4x86.c Sat Sep 29 05:33:02 2007 +00001.3 @@ -1,5 +1,5 @@1.4 /**1.5 - * $Id: sh4x86.c,v 1.15 2007-09-28 07:27:20 nkeynes Exp $1.6 + * $Id: sh4x86.c,v 1.16 2007-09-29 05:33:02 nkeynes Exp $1.7 *1.8 * SH4 => x86 translation. This version does no real optimization, it just1.9 * outputs straight-line x86 code - it mainly exists to provide a baseline1.10 @@ -42,6 +42,7 @@1.11 gboolean in_delay_slot;1.12 gboolean priv_checked; /* true if we've already checked the cpu mode. */1.13 gboolean fpuen_checked; /* true if we've already checked fpu enabled. */1.14 + gboolean branch_taken; /* true if we branched unconditionally */1.15 uint32_t block_start_pc;1.17 /* Allocated memory for the (block-wide) back-patch list */1.18 @@ -371,6 +372,7 @@1.19 sh4_x86.in_delay_slot = FALSE;1.20 sh4_x86.priv_checked = FALSE;1.21 sh4_x86.fpuen_checked = FALSE;1.22 + sh4_x86.branch_taken = FALSE;1.23 sh4_x86.backpatch_posn = 0;1.24 sh4_x86.block_start_pc = pc;1.25 }1.26 @@ -410,6 +412,10 @@1.27 * Write the block trailer (exception handling block)1.28 */1.29 void sh4_translate_end_block( sh4addr_t pc ) {1.30 + if( sh4_x86.branch_taken == FALSE ) {1.31 + // Didn't exit unconditionally already, so write the termination here1.32 + exit_block( pc, pc );1.33 + }1.34 if( sh4_x86.backpatch_posn != 0 ) {1.35 uint8_t *end_ptr = xlat_output;1.36 // Exception termination. Jump block for various exception codes:1.37 @@ -562,6 +568,7 @@1.38 sh4_x86.in_delay_slot = TRUE;1.39 sh4_x86_translate_instruction( pc + 2 );1.40 exit_block_pcset(pc+2);1.41 + sh4_x86.branch_taken = TRUE;1.42 return 4;1.43 }1.44 }1.45 @@ -578,6 +585,7 @@1.46 sh4_x86.in_delay_slot = TRUE;1.47 sh4_x86_translate_instruction( pc + 2 );1.48 exit_block_pcset(pc+2);1.49 + sh4_x86.branch_taken = TRUE;1.50 return 4;1.51 }1.52 }1.53 @@ -804,6 +812,7 @@1.54 sh4_x86.in_delay_slot = TRUE;1.55 sh4_x86_translate_instruction(pc+2);1.56 exit_block_pcset(pc+2);1.57 + sh4_x86.branch_taken = TRUE;1.58 return 4;1.59 }1.60 }1.61 @@ -814,7 +823,6 @@1.62 call_func0( sh4_sleep );1.63 sh4_x86.in_delay_slot = FALSE;1.64 INC_r32(R_ESI);1.65 - exit_block(pc+2, pc+2);1.66 return 2;1.67 }1.68 break;1.69 @@ -833,6 +841,7 @@1.70 sh4_x86.fpuen_checked = FALSE;1.71 sh4_x86_translate_instruction(pc+2);1.72 exit_block_pcset(pc+2);1.73 + sh4_x86.branch_taken = TRUE;1.74 return 4;1.75 }1.76 }1.77 @@ -1854,6 +1863,7 @@1.78 sh4_x86.in_delay_slot = TRUE;1.79 sh4_x86_translate_instruction(pc+2);1.80 exit_block_pcset(pc+2);1.81 + sh4_x86.branch_taken = TRUE;1.82 return 4;1.83 }1.84 }1.85 @@ -1881,6 +1891,7 @@1.86 sh4_x86.in_delay_slot = TRUE;1.87 sh4_x86_translate_instruction(pc+2);1.88 exit_block_pcset(pc+2);1.89 + sh4_x86.branch_taken = TRUE;1.90 return 4;1.91 }1.92 }1.93 @@ -2277,7 +2288,6 @@1.94 JE_rel8( 30, nottaken );1.95 exit_block( disp + pc + 4, pc+2 );1.96 JMP_TARGET(nottaken);1.97 - exit_block( pc + 2, pc+2 );1.98 return 2;1.99 }1.100 }1.101 @@ -2292,7 +2302,6 @@1.102 JNE_rel8( 30, nottaken );1.103 exit_block( disp + pc + 4, pc+2 );1.104 JMP_TARGET(nottaken);1.105 - exit_block( pc + 2, pc + 2 );1.106 return 2;1.107 }1.108 }1.109 @@ -2311,7 +2320,6 @@1.110 // not taken1.111 *patch = (xlat_output - ((uint8_t *)patch)) - 4;1.112 sh4_x86_translate_instruction(pc+2);1.113 - exit_block( pc + 4, pc+4 );1.114 return 4;1.115 }1.116 }1.117 @@ -2330,7 +2338,6 @@1.118 // not taken1.119 *patch = (xlat_output - ((uint8_t *)patch)) - 4;1.120 sh4_x86_translate_instruction(pc+2);1.121 - exit_block( pc + 4, pc+4 );1.122 return 4;1.123 }1.124 }1.125 @@ -2361,6 +2368,7 @@1.126 sh4_x86.in_delay_slot = TRUE;1.127 sh4_x86_translate_instruction( pc + 2 );1.128 exit_block( disp + pc + 4, pc+4 );1.129 + sh4_x86.branch_taken = TRUE;1.130 return 4;1.131 }1.132 }1.133 @@ -2376,6 +2384,7 @@1.134 sh4_x86.in_delay_slot = TRUE;1.135 sh4_x86_translate_instruction( pc + 2 );1.136 exit_block( disp + pc + 4, pc+4 );1.137 + sh4_x86.branch_taken = TRUE;1.138 return 4;1.139 }1.140 }1.141 @@ -2421,6 +2430,7 @@1.142 call_func0( sh4_raise_trap );1.143 ADD_imm8s_r32( 4, R_ESP );1.144 exit_block_pcset(pc);1.145 + sh4_x86.branch_taken = TRUE;1.146 return 2;1.147 }1.148 }
.