64 lines
1.3 KiB
ArmAsm
64 lines
1.3 KiB
ArmAsm
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# Startup Code for the Morpho ms1
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# Create a label for the start of the eh_frame section.
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.section .eh_frame
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__eh_frame_begin:
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.section .text
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.global _start
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_start:
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;; Initialise the stack pointer
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ldui sp, #%hi16(__stack)
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addui sp, sp, #%lo16(__stack)
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or fp, sp, sp
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;; Zero the data space
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ldui r9, #%hi16(_edata)
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addui r9, r9, #%lo16(_edata)
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ldui r10, #%hi16(_end)
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addui r10, r10, #%lo16(_end)
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addi r5, r0, #0
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.L0:
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stw r5, r9, #0
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addi r9, r9, #4
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or r0, r0, r0 ; nop
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brle r9, r10, .L0
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or r0, r0, r0 ; nop
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;; Call global and static constructors
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ldui r10, #%hi16(_init)
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addui r10, r10, #%lo16(_init)
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or r0, r0, r0 ; nop
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jal r14, r10
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or r0, r0, r0 ; nop
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;; Setup destructors to be called from exit.
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;; (Just in case main never returns....)
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ldui r10, #%hi16(atexit)
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addui r10, r10, #%lo16(atexit)
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ldui r1, #%hi16(_fini)
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addui r1, r1, #%lo16(_fini)
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or r0, r0, r0 ; nop
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jal r14, r10
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or r0, r0, r0 ; nop
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;; Initialise argc, argv and envp to empty
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addi r1, r0, #0
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addi r2, r0, #0
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addi r3, r0, #0
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;; Call main
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ldui r10, #%hi16(main)
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addui r10, r10, #%lo16(main)
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or r0, r0, r0 ; nop
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jal r14, r10
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or r0, r0, r0 ; nop
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;; Jump to exit
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ldui r10, #%hi16(exit)
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addui r10, r10, #%lo16(exit)
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or r0, r0, r0 ; nop
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jal r14, r10
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or r0, r0, r0 ; nop
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