48 lines
1.0 KiB
ArmAsm
48 lines
1.0 KiB
ArmAsm
/* Sample initialization file */
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.extern main
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.extern exit
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/* .text is used instead of .section .text so it works with arm-aout too. */
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.text
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.code 32
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.align 0
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.global _mainCRTStartup
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.global _start
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.global start
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start:
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_start:
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_mainCRTStartup:
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/* Start by setting up a stack */
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/* Set up the stack pointer to end of bss */
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ldr r3, .LC2
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mov sp, r3
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sub sl, sp, #512 /* Still assumes 512 bytes below sl */
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mov a2, #0 /* Second arg: fill value */
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mov fp, a2 /* Null frame pointer */
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mov r7, a2 /* Null frame pointer for Thumb */
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ldr a1, .LC1 /* First arg: start of memory block */
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ldr a3, .LC2 /* Second arg: end of memory block */
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sub a3, a3, a1 /* Third arg: length of block */
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mov r0, #0 /* no arguments */
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mov r1, #0 /* no argv either */
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bl main
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bl exit /* Should not return */
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/* For Thumb, constants must be after the code since only
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positive offsets are supported for PC relative addresses. */
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.align 0
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.LC1:
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.word __bss_start__
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.LC2:
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.word __bss_end__
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