[254b4450] | 1 | /* |
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| 2 | * crt0.S -- startup file for hppa on RTEMS |
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| 3 | * |
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| 4 | * $Id$ |
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| 5 | */ |
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| 6 | |
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| 7 | .COPYRIGHT "crt0.S for hppa" |
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| 8 | |
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| 9 | .DATA |
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| 10 | |
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| 11 | _progname .STRINGZ "simhppa" |
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| 12 | _crt0_argv .WORD _progname, 0 |
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| 13 | |
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| 14 | /* |
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| 15 | * Set up the standard spaces (sections) These definitions come |
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| 16 | * from /lib/pcc_prefix.s. |
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| 17 | */ |
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| 18 | .TEXT |
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| 19 | |
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| 20 | /* |
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| 21 | * stuff we need that is defined elsewhere. |
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| 22 | */ |
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[e2a2ec60] | 23 | .IMPORT boot_card, CODE |
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[254b4450] | 24 | .IMPORT _bss_start, DATA |
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| 25 | .IMPORT _bss_end, DATA |
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| 26 | .IMPORT environ, DATA |
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| 27 | |
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| 28 | /* |
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| 29 | * start -- set things up so the application will run. |
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| 30 | * |
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| 31 | */ |
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| 32 | .PROC |
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| 33 | .CALLINFO SAVE_SP, FRAME=48 |
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| 34 | .EXPORT $START$,ENTRY |
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| 35 | .EXPORT start,ENTRY |
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| 36 | $START$ |
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| 37 | start: |
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| 38 | |
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| 39 | /* |
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| 40 | * Get a stack |
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| 41 | */ |
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| 42 | |
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| 43 | ldil L%crt_stack+48,%r30 |
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| 44 | ldo R%crt_stack+48(%r30),%r30 |
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| 45 | |
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| 46 | /* |
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| 47 | * we need to set %r27 (global data pointer) here |
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| 48 | */ |
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| 49 | |
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| 50 | ldil L%$global$,%r27 |
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| 51 | ldo R%$global$(%r27),%r27 |
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| 52 | |
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| 53 | /* |
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| 54 | * zerobss -- zero out the bss section |
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| 55 | * XXX We don't do this since simulator and boot rom will do this for us. |
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| 56 | */ |
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| 57 | #if 0 |
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| 58 | ; load the start of bss |
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| 59 | ldil L%_bss_start,%r4 |
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| 60 | ldo R%_bss_start(%r4),%r4 |
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| 61 | |
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| 62 | ; load the end of bss |
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| 63 | ldil L%_bss_end,%r5 |
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| 64 | ldo R%_bss_end(%r5),%r5 |
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| 65 | |
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| 66 | |
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| 67 | bssloop |
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| 68 | addi -1,%r5,%r5 ; decrement _bss_end |
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| 69 | stb %r0,0(0,%r5) ; we do this by bytes for now even |
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| 70 | ; though it is slower, it is safer |
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| 71 | combf,= %r4,%r5, bssloop |
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| 72 | nop |
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| 73 | #endif |
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| 74 | |
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| 75 | ldi 1,%ret0 |
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| 76 | |
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| 77 | /* |
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[e2a2ec60] | 78 | * Call the "boot_card" routine from the application to get it going. |
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| 79 | * We call it as boot_card(1, argv, 0) |
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[254b4450] | 80 | */ |
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| 81 | |
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| 82 | copy %r0, %r24 |
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| 83 | |
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| 84 | ldil L%_crt0_argv,%r25 |
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| 85 | ldo R%_crt0_argv(%r25),%r25 |
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| 86 | |
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[e2a2ec60] | 87 | bl boot_card,%r2 |
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[254b4450] | 88 | ldo 1(%r0), %r26 |
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| 89 | |
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| 90 | .PROCEND |
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| 91 | /* |
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| 92 | * _exit -- Exit from the application. Normally we cause a user trap |
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| 93 | * to return to the ROM monitor for another run, but with |
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| 94 | * this monitor we can not. Still, "C" wants this symbol, it |
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| 95 | * should be here. Jumping to 0xF0000004 jumps back into the |
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| 96 | * firmware, while writing a 5 to 0xFFFE0030 causes a reset. |
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| 97 | */ |
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| 98 | _exit_fallthru |
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| 99 | .PROC |
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| 100 | .CALLINFO |
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| 101 | .ENTRY |
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| 102 | |
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| 103 | ;; This just causes a breakpoint exception |
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| 104 | break 0x0,0x0 |
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| 105 | bv,n (%rp) |
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| 106 | nop |
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| 107 | .EXIT |
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| 108 | .PROCEND |
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| 109 | |
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| 110 | /* |
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| 111 | * _sr4export -- support for called functions. (mostly for GDB) |
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| 112 | */ |
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| 113 | .EXPORT _sr4export, ENTRY |
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| 114 | _sr4export: |
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| 115 | .PROC |
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| 116 | .CALLINFO |
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| 117 | .ENTRY |
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| 118 | |
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| 119 | ble 0(%sr4,%r22) |
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| 120 | copy %r31,%rp |
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| 121 | ldw -18(%sr0,%sp),%rp |
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| 122 | ldsid (%sr0,%rp),%r1 |
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| 123 | mtsp %r1,%sr0 |
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| 124 | be,n 0(%sr0,%rp) |
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| 125 | nop |
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| 126 | .EXIT |
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| 127 | .PROCEND |
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| 128 | |
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| 129 | |
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[f35f24a] | 130 | #if 0 |
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[254b4450] | 131 | .subspa $UNWIND_START$,QUAD=0,ALIGN=8,ACCESS=0x2c,SORT=56 |
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| 132 | .export $UNWIND_START |
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| 133 | $UNWIND_START |
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| 134 | .subspa $UNWIND$,QUAD=0,ALIGN=8,ACCESS=0x2c,SORT=64 |
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| 135 | .subspa $UNWIND_END$,QUAD=0,ALIGN=8,ACCESS=0x2c,SORT=72 |
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| 136 | .export $UNWIND_END |
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| 137 | $UNWIND_END |
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| 138 | .subspa $RECOVER_START$,QUAD=0,ALIGN=4,ACCESS=0x2c,SORT=73 |
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| 139 | .export $RECOVER_START |
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| 140 | $RECOVER_START |
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| 141 | .subspa $RECOVER$,QUAD=0,ALIGN=4,ACCESS=0x2c,SORT=80 |
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| 142 | .subspa $RECOVER_END$,QUAD=0,ALIGN=4,ACCESS=0x2c,SORT=88 |
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| 143 | .export $RECOVER_END |
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| 144 | $RECOVER_END |
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[f35f24a] | 145 | #endif |
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[254b4450] | 146 | |
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| 147 | /* |
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| 148 | * Here we set up the standard date sub spaces. |
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| 149 | * |
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| 150 | * Set up some room for a stack. We just grab a chunk of memory. |
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| 151 | * We also setup some space for the global variable space, which |
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| 152 | * must be done using the reserved name "$global$" so "C" code |
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| 153 | * can find it. The stack grows towards the higher addresses. |
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| 154 | */ |
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| 155 | |
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[f35f24a] | 156 | #if 0 |
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[254b4450] | 157 | .subspa $DATA$,QUAD=1,ALIGN=8,ACCESS=0x1f,SORT=16 |
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| 158 | .subspa $SHORTDATA$,QUAD=1,ALIGN=8,ACCESS=0x1f,SORT=24 |
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| 159 | .subspa $GLOBAL$,QUAD=1,ALIGN=8,ACCESS=0x1f,SORT=40 |
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| 160 | .export $global$ |
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| 161 | $global$ |
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| 162 | .subspa $SHORTBSS$,QUAD=1,ALIGN=8,ACCESS=0x1f,SORT=80,ZERO |
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| 163 | .subspa $BSS$,QUAD=1,ALIGN=8,ACCESS=0x1f,SORT=82,ZERO |
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| 164 | |
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| 165 | .subspa $STACK$,QUAD=1,ALIGN=8,ACCESS=0x1f,SORT=88,ZERO |
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[f35f24a] | 166 | #endif |
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[254b4450] | 167 | |
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| 168 | .export crt_stack |
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| 169 | crt_stack |
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| 170 | .comm 0x1000 |
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| 171 | |
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| 172 | .end |
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| 173 | |
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