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Last change
on this file since 668 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:
1.3 KB
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| Rev | Line | |
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| [444] | 1 | # Startup Code for the Morpho mt |
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| 2 | |
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| 3 | # Create a label for the start of the eh_frame section. |
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| 4 | .section .eh_frame |
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| 5 | __eh_frame_begin: |
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| 6 | |
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| 7 | .section .text |
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| 8 | .global _start |
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| 9 | _start: |
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| 10 | |
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| 11 | ;; Initialise the stack pointer |
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| 12 | ldui sp, #%hi16(__stack) |
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| 13 | addui sp, sp, #%lo16(__stack) |
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| 14 | or fp, sp, sp |
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| 15 | |
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| 16 | ;; Zero the data space |
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| 17 | ldui r9, #%hi16(_edata) |
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| 18 | addui r9, r9, #%lo16(_edata) |
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| 19 | ldui r10, #%hi16(_end) |
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| 20 | addui r10, r10, #%lo16(_end) |
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| 21 | addi r5, r0, #0 |
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| 22 | |
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| 23 | .L0: |
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| 24 | stw r5, r9, #0 |
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| 25 | addi r9, r9, #4 |
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| 26 | or r0, r0, r0 ; nop |
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| 27 | brle r9, r10, .L0 |
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| 28 | or r0, r0, r0 ; nop |
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| 29 | |
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| 30 | ;; Call global and static constructors |
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| 31 | ldui r10, #%hi16(_init) |
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| 32 | addui r10, r10, #%lo16(_init) |
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| 33 | or r0, r0, r0 ; nop |
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| 34 | jal r14, r10 |
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| 35 | or r0, r0, r0 ; nop |
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| 36 | ;; Setup destructors to be called from exit. |
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| 37 | ;; (Just in case main never returns....) |
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| 38 | ldui r10, #%hi16(atexit) |
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| 39 | addui r10, r10, #%lo16(atexit) |
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| 40 | ldui r1, #%hi16(_fini) |
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| 41 | addui r1, r1, #%lo16(_fini) |
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| 42 | or r0, r0, r0 ; nop |
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| 43 | jal r14, r10 |
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| 44 | or r0, r0, r0 ; nop |
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| 45 | |
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| 46 | ;; Initialise argc, argv and envp to empty |
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| 47 | addi r1, r0, #0 |
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| 48 | addi r2, r0, #0 |
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| 49 | addi r3, r0, #0 |
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| 50 | |
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| 51 | ;; Call main |
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| 52 | ldui r10, #%hi16(main) |
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| 53 | addui r10, r10, #%lo16(main) |
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| 54 | or r0, r0, r0 ; nop |
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| 55 | jal r14, r10 |
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| 56 | or r0, r0, r0 ; nop |
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| 57 | |
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| 58 | ;; Jump to exit |
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| 59 | ldui r10, #%hi16(exit) |
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| 60 | addui r10, r10, #%lo16(exit) |
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| 61 | or r0, r0, r0 ; nop |
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| 62 | jal r14, r10 |
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| 63 | or r0, r0, r0 ; nop |
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