Subversion Repositories openrisc_2011-10-31

# Startup Code for the Morpho mt

# Create a label for the start of the eh_frame section.
        .section .eh_frame
__eh_frame_begin:

        .section .text
        .global _start
_start:
        
        ;; Initialise the stack pointer
        ldui    sp, #%hi16(__stack)
        addui   sp, sp, #%lo16(__stack)
        or      fp, sp, sp

        ;; Zero the data space
        ldui    r9, #%hi16(_edata)
        addui   r9, r9, #%lo16(_edata)
        ldui    r10, #%hi16(_end)
        addui   r10, r10, #%lo16(_end)
        addi    r5,  r0, #0

.L0:    
        stw     r5, r9, #0
        addi    r9, r9, #4
        or      r0, r0, r0      ; nop
        brle    r9, r10, .L0
        or      r0, r0, r0      ; nop

        ;; Call global and static constructors
        ldui    r10, #%hi16(_init)
        addui   r10, r10, #%lo16(_init)
        or      r0, r0, r0      ; nop
        jal     r14, r10
        or      r0, r0, r0      ; nop
        ;;  Setup destructors to be called from exit.
        ;;  (Just in case main never returns....)
        ldui    r10, #%hi16(atexit)
        addui   r10, r10, #%lo16(atexit)
        ldui    r1, #%hi16(_fini)
        addui   r1, r1, #%lo16(_fini)
        or      r0, r0, r0      ; nop
        jal     r14, r10
        or      r0, r0, r0      ; nop

        ;;  Initialise argc, argv and envp to empty
        addi    r1, r0, #0
        addi    r2, r0, #0
        addi    r3, r0, #0

        ;; Call main
        ldui    r10, #%hi16(main)
        addui   r10, r10, #%lo16(main)
        or      r0, r0, r0      ; nop
        jal     r14, r10
        or      r0, r0, r0      ; nop

        ;; Jump to exit
        ldui    r10, #%hi16(exit)
        addui   r10, r10, #%lo16(exit)
        or      r0, r0, r0      ; nop
        jal     r14, r10
        or      r0, r0, r0      ; nop