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Last change
on this file since 467 was
444,
checked in by satin@…, 6 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
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File size:
692 bytes
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| Rev | Line | |
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| [444] | 1 | # FR30 startup code |
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| 2 | |
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| 3 | .section .text |
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| 4 | .global _start |
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| 5 | _start: |
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| 6 | |
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| 7 | ;; Initialise the stack pointer |
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| 8 | ldi:32 __stack, r0 |
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| 9 | mov r0, sp |
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| 10 | mov r0, fp |
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| 11 | |
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| 12 | ;; Zero the data space |
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| 13 | ldi:32 #_edata, r0 |
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| 14 | ldi:32 #_end, r1 |
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| 15 | ldi:8 #0, r2 |
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| 16 | .L0: |
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| 17 | st r2, @r0 |
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| 18 | add #4, r0 |
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| 19 | cmp r1, r0 |
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| 20 | blt .L0 |
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| 21 | |
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| 22 | ;; Call global and static constructors |
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| 23 | ldi:32 _init, r0 |
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| 24 | call @r0 |
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| 25 | |
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| 26 | ;; Setup destrcutors to be called from exit. |
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| 27 | ;; (Just in case main never returns....) |
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| 28 | ldi:32 atexit, r0 |
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| 29 | ldi:32 _fini, r4 |
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| 30 | call @r0 |
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| 31 | |
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| 32 | ;; Initialise argc, argv and envp to empty |
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| 33 | ldi:8 #0, r4 |
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| 34 | ldi:8 #0, r5 |
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| 35 | ldi:8 #0, r6 |
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| 36 | |
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| 37 | ;; Call main |
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| 38 | ldi:32 main, r0 |
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| 39 | call @r0 |
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| 40 | |
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| 41 | ;; Jump to exit |
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| 42 | ldi:32 exit, r0 |
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| 43 | call @r0 |
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| 44 | |
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| 45 | ;; Should never reach here |
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| 46 | int #9 |
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