Last change
on this file since 667 was
444,
checked in by satin@…, 6 years ago
|
add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
|
File size:
1.3 KB
|
Rev | Line | |
---|
[444] | 1 | # Startup Code for the Morpho mt |
---|
| 2 | |
---|
| 3 | # Create a label for the start of the eh_frame section. |
---|
| 4 | .section .eh_frame |
---|
| 5 | __eh_frame_begin: |
---|
| 6 | |
---|
| 7 | .section .text |
---|
| 8 | .global _start |
---|
| 9 | _start: |
---|
| 10 | |
---|
| 11 | ;; Initialise the stack pointer |
---|
| 12 | ldui sp, #%hi16(__stack) |
---|
| 13 | addui sp, sp, #%lo16(__stack) |
---|
| 14 | or fp, sp, sp |
---|
| 15 | |
---|
| 16 | ;; Zero the data space |
---|
| 17 | ldui r9, #%hi16(_edata) |
---|
| 18 | addui r9, r9, #%lo16(_edata) |
---|
| 19 | ldui r10, #%hi16(_end) |
---|
| 20 | addui r10, r10, #%lo16(_end) |
---|
| 21 | addi r5, r0, #0 |
---|
| 22 | |
---|
| 23 | .L0: |
---|
| 24 | stw r5, r9, #0 |
---|
| 25 | addi r9, r9, #4 |
---|
| 26 | or r0, r0, r0 ; nop |
---|
| 27 | brle r9, r10, .L0 |
---|
| 28 | or r0, r0, r0 ; nop |
---|
| 29 | |
---|
| 30 | ;; Call global and static constructors |
---|
| 31 | ldui r10, #%hi16(_init) |
---|
| 32 | addui r10, r10, #%lo16(_init) |
---|
| 33 | or r0, r0, r0 ; nop |
---|
| 34 | jal r14, r10 |
---|
| 35 | or r0, r0, r0 ; nop |
---|
| 36 | ;; Setup destructors to be called from exit. |
---|
| 37 | ;; (Just in case main never returns....) |
---|
| 38 | ldui r10, #%hi16(atexit) |
---|
| 39 | addui r10, r10, #%lo16(atexit) |
---|
| 40 | ldui r1, #%hi16(_fini) |
---|
| 41 | addui r1, r1, #%lo16(_fini) |
---|
| 42 | or r0, r0, r0 ; nop |
---|
| 43 | jal r14, r10 |
---|
| 44 | or r0, r0, r0 ; nop |
---|
| 45 | |
---|
| 46 | ;; Initialise argc, argv and envp to empty |
---|
| 47 | addi r1, r0, #0 |
---|
| 48 | addi r2, r0, #0 |
---|
| 49 | addi r3, r0, #0 |
---|
| 50 | |
---|
| 51 | ;; Call main |
---|
| 52 | ldui r10, #%hi16(main) |
---|
| 53 | addui r10, r10, #%lo16(main) |
---|
| 54 | or r0, r0, r0 ; nop |
---|
| 55 | jal r14, r10 |
---|
| 56 | or r0, r0, r0 ; nop |
---|
| 57 | |
---|
| 58 | ;; Jump to exit |
---|
| 59 | ldui r10, #%hi16(exit) |
---|
| 60 | addui r10, r10, #%lo16(exit) |
---|
| 61 | or r0, r0, r0 ; nop |
---|
| 62 | jal r14, r10 |
---|
| 63 | or r0, r0, r0 ; nop |
---|
Note: See
TracBrowser
for help on using the repository browser.