lxdream 0.9.1| filename | test/crt0.s |
| changeset | 185:6755a04c447f |
| author | nkeynes |
| date | Sun Aug 06 06:13:51 2006 +0000 (17 years ago) |
| permissions | -rw-r--r-- |
| last change | First pass at implementing the tile clip. Reasonably accurate wrt basic understanding of how its supposed to work, not so accurate wrt actual hardware behaviour |
| file | annotate | diff | log | raw |
| nkeynes@185 | 1 | .section .text |
| nkeynes@185 | 2 | .global start |
| nkeynes@185 | 3 | .global ___exit |
| nkeynes@185 | 4 | .global _atexit |
| nkeynes@185 | 5 | start: |
| nkeynes@185 | 6 | mov.l setup_cache_k,r0 |
| nkeynes@185 | 7 | mov.l p2_mask,r1 |
| nkeynes@185 | 8 | or r1,r0 |
| nkeynes@185 | 9 | jmp @r0 |
| nkeynes@185 | 10 | nop |
| nkeynes@185 | 11 | setup_cache: |
| nkeynes@185 | 12 | mov.l ccr_addr,r0 |
| nkeynes@185 | 13 | mov.w ccr_data,r1 |
| nkeynes@185 | 14 | mov.l r1,@r0 |
| nkeynes@185 | 15 | mov.l start_2_k,r0 |
| nkeynes@185 | 16 | nop |
| nkeynes@185 | 17 | nop |
| nkeynes@185 | 18 | nop |
| nkeynes@185 | 19 | nop |
| nkeynes@185 | 20 | nop |
| nkeynes@185 | 21 | nop |
| nkeynes@185 | 22 | nop |
| nkeynes@185 | 23 | jmp @r0 |
| nkeynes@185 | 24 | nop |
| nkeynes@185 | 25 | start_2: |
| nkeynes@185 | 26 | mov.l old_stack_k,r14 |
| nkeynes@185 | 27 | mov.l r15,@r14 |
| nkeynes@185 | 28 | mov.l old_pr_k,r14 |
| nkeynes@185 | 29 | sts pr,r15 |
| nkeynes@185 | 30 | mov.l r15,@r14 |
| nkeynes@185 | 31 | mov.l stack_k,r15 |
| nkeynes@185 | 32 | |
| nkeynes@185 | 33 | ! zero out bss |
| nkeynes@185 | 34 | mov.l edata_k,r0 |
| nkeynes@185 | 35 | mov.l end_k,r1 |
| nkeynes@185 | 36 | mov #0,r2 |
| nkeynes@185 | 37 | start_l: |
| nkeynes@185 | 38 | mov.l r2,@r0 |
| nkeynes@185 | 39 | add #4,r0 |
| nkeynes@185 | 40 | cmp/ge r0,r1 |
| nkeynes@185 | 41 | bt start_l |
| nkeynes@185 | 42 | |
| nkeynes@185 | 43 | #if defined (__SH3E__) || defined(__SH4_SINGLE__) || defined(__SH4__) || defined(__SH4_SINGLE_ONLY) |
| nkeynes@185 | 44 | mov.l set_fpscr_k, r1 |
| nkeynes@185 | 45 | jsr @r1 |
| nkeynes@185 | 46 | mov #0,r4 |
| nkeynes@185 | 47 | lds r3,fpscr |
| nkeynes@185 | 48 | #endif /* defined (__SH3E__) || defined(__SH4_SINGLE__) || defined(__SH4__) || defined(__SH4_SINGLE_ONLY__) */ |
| nkeynes@185 | 49 | |
| nkeynes@185 | 50 | ! call the mainline |
| nkeynes@185 | 51 | mov.l main_k,r0 |
| nkeynes@185 | 52 | jsr @r0 |
| nkeynes@185 | 53 | or r0,r0 |
| nkeynes@185 | 54 | |
| nkeynes@185 | 55 | ! call exit |
| nkeynes@185 | 56 | mov r0,r4 |
| nkeynes@185 | 57 | mov.l exit_k,r0 |
| nkeynes@185 | 58 | jsr @r0 |
| nkeynes@185 | 59 | or r0,r0 |
| nkeynes@185 | 60 | |
| nkeynes@185 | 61 | ___exit: |
| nkeynes@185 | 62 | mov.l old_pr_k,r14 |
| nkeynes@185 | 63 | mov.l @r14,r15 |
| nkeynes@185 | 64 | lds r15,pr |
| nkeynes@185 | 65 | mov.l old_stack_k,r14 |
| nkeynes@185 | 66 | mov.l @r14,r15 |
| nkeynes@185 | 67 | rts |
| nkeynes@185 | 68 | nop |
| nkeynes@185 | 69 | |
| nkeynes@185 | 70 | _atexit: |
| nkeynes@185 | 71 | rts |
| nkeynes@185 | 72 | nop |
| nkeynes@185 | 73 | |
| nkeynes@185 | 74 | .align 4 |
| nkeynes@185 | 75 | #if defined (__SH3E__) || defined(__SH4_SINGLE__) || defined(__SH4__) || defined(__SH4_SINGLE_ONLY__) |
| nkeynes@185 | 76 | set_fpscr_k: |
| nkeynes@185 | 77 | .long ___set_fpscr |
| nkeynes@185 | 78 | #endif /* defined (__SH3E__) || defined(__SH4_SINGLE__) || defined(__SH4__) || defined(SH4_SINGLE_ONLY) */ |
| nkeynes@185 | 79 | stack_k: |
| nkeynes@185 | 80 | .long _stack |
| nkeynes@185 | 81 | edata_k: |
| nkeynes@185 | 82 | .long _edata |
| nkeynes@185 | 83 | end_k: |
| nkeynes@185 | 84 | .long _end |
| nkeynes@185 | 85 | main_k: |
| nkeynes@185 | 86 | .long _main |
| nkeynes@185 | 87 | exit_k: |
| nkeynes@185 | 88 | .long _exit |
| nkeynes@185 | 89 | |
| nkeynes@185 | 90 | old_stack_k: |
| nkeynes@185 | 91 | .long _old_stack |
| nkeynes@185 | 92 | old_pr_k: |
| nkeynes@185 | 93 | .long _old_pr |
| nkeynes@185 | 94 | |
| nkeynes@185 | 95 | _old_stack: |
| nkeynes@185 | 96 | .long 0 |
| nkeynes@185 | 97 | _old_pr: |
| nkeynes@185 | 98 | .long 0 |
| nkeynes@185 | 99 | |
| nkeynes@185 | 100 | setup_cache_k: |
| nkeynes@185 | 101 | .long setup_cache |
| nkeynes@185 | 102 | start_2_k: |
| nkeynes@185 | 103 | .long start_2 |
| nkeynes@185 | 104 | p2_mask: |
| nkeynes@185 | 105 | .long 0xa0000000 |
| nkeynes@185 | 106 | ccr_addr: |
| nkeynes@185 | 107 | .long 0xff00001c |
| nkeynes@185 | 108 | ccr_data: |
| nkeynes@185 | 109 | .word 0x090b |
| nkeynes@185 | 110 | |
| nkeynes@185 | 111 | .align 4 |
| nkeynes@185 | 112 | |
| nkeynes@185 | 113 | #ifdef __ELF__ |
| nkeynes@185 | 114 | .section .stack,"aw" |
| nkeynes@185 | 115 | #else |
| nkeynes@185 | 116 | .section .stack |
| nkeynes@185 | 117 | #endif |
| nkeynes@185 | 118 | ! _stack: .long 0xdeaddead |
| nkeynes@185 | 119 |
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