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Last change
on this file since 450 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:
749 bytes
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| 1 | // MCore StartUp Code. |
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| 2 | |
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| 3 | .import main |
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| 4 | .import exit |
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| 5 | |
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| 6 | .text |
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| 7 | .export _start |
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| 8 | _start: |
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| 9 | .export _mainCRTStartup |
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| 10 | _mainCRTStartup: |
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| 11 | // Initialise the stack pointer |
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| 12 | lrw r1, _stack |
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| 13 | mov r0, r1 |
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| 14 | |
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| 15 | // Zero the .bss data space |
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| 16 | lrw r1, __bss_start__ |
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| 17 | lrw r2, __bss_end__ |
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| 18 | movi r3, 0 |
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| 19 | .L0: |
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| 20 | st r3, (r1, 0) |
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| 21 | addi r1, 4 |
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| 22 | cmphs r1, r2 |
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| 23 | bf .L0 |
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| 24 | #ifdef __ELF__ |
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| 25 | // Call the global/static constructors |
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| 26 | jbsr _init |
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| 27 | |
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| 28 | // Setup destructors to be called from exit, |
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| 29 | // just in case main never returns... |
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| 30 | lrw r2, _fini |
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| 31 | jbsr atexit |
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| 32 | #endif |
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| 33 | |
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| 34 | // Initialise the parameters to main() |
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| 35 | movi r2, 0 // argc |
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| 36 | movi r3, 0 // argv |
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| 37 | movi r4, 0 // envp |
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| 38 | |
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| 39 | // Call main |
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| 40 | jbsr main |
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| 41 | |
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| 42 | // Call exit |
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| 43 | movi r2, 0 |
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| 44 | jbsr exit |
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| 45 | |
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| 46 | // We should never reach here. |
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| 47 | bkpt |
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| 48 | |
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| 49 | |
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