60 lines
1.2 KiB
ArmAsm
60 lines
1.2 KiB
ArmAsm
.macro FILL_ZERO_32_BYTE_ALIGNED
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cmp r1, r10
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beq _fill_break.\@
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.irp i, 2, 3, 4, 5, 6, 7, 8, 9
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mov r\i, #0
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.endr
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_fill_loop.\@:
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stmia r1!, {r2 - r9}
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cmp r1, r10
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blt _fill_loop.\@
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_fill_break.\@:
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.endm
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.macro COPY_32_BYTE_ALIGNED
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cmp r1, r10
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beq _fill_break.\@
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_fill_loop.\@:
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ldmia r0!, {r2 - r9}
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stmia r1!, {r2 - r9}
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cmp r1, r10
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bne _fill_loop.\@
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_fill_break.\@:
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.endm
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.section .text.start
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.global _start
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_start:
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/*
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_link_text:
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ldr r0, =__text_load_start
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ldr r1, =__text_link_start
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ldr r10, =__text_link_end
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COPY_32_BYTE_ALIGNED
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_link_data:
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ldr r0, =__data_load_start
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ldr r1, =__data_link_start
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ldr r10, =__data_link_end
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COPY_32_BYTE_ALIGNED
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_link_rodata:
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ldr r0, =__rodata_load_start
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ldr r1, =__rodata_link_start
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ldr r10, =__rodata_link_end
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COPY_32_BYTE_ALIGNED
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*/
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_link_bss:
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ldr r1, =__bss_link_start
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ldr r10, =__bss_link_end
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FILL_ZERO_32_BYTE_ALIGNED
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_c_runtime:
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/* set stack pointer */
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ldr sp, =__stack_end
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/* jump to main */
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ldr r0, =main
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bx r0
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