35 lines
816 B
ArmAsm
35 lines
816 B
ArmAsm
#include <linux/linkage.h>
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.section .text.setupc
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/*
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* setup_c: copy binary to link address, clear bss and
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* continue executing at new address.
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*
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* This function does not return to the address it is
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* called from, but to the same location in the copied
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* binary.
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*/
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ENTRY(setup_c)
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push {r4, r5}
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mov r5, lr
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bl get_runtime_offset
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subs r4, r0, #0
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beq 1f /* skip memcpy if already at correct address */
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ldr r0,=_text
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ldr r2,=__bss_start
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sub r2, r2, r0
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sub r1, r0, r4
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bl memcpy /* memcpy(_text, _text - offset, __bss_start - _text) */
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1: ldr r0, =__bss_start
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mov r1, #0
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ldr r2, =__bss_stop
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sub r2, r2, r0
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bl memset /* clear bss */
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mov r0, #0
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mcr p15, 0, r0, c7, c5, 0 /* flush icache */
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add lr, r5, r4 /* adjust return address to new location */
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pop {r4, r5}
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mov pc, lr
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ENDPROC(setup_c)
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