bpatch/bpatch.S at main · farid1991/bpatch · GitHub

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/* bpatch.S */
        .syntax unified
        .cpu arm926ej-s

/* ----------------- Start ----------------- */
        .thumb
        .global _start
_start:
        adr     r0, arm_entry
        bx      r0

/* ---------------- ARM mode ---------------- */
        .arm
arm_entry:
1:      mrc     p15, 0, r15, c7, c10, 3  /* test_clean_d_cache */
        bne     1b

        mov     r0, #0                   /* drain_write_buffer */
        mcr     p15, 0, r0, c7, c10, 4

        mov     r0, #0                   /* invalidate_i_cache */
        mcr     p15, 0, r0, c7, c5, 0

        adr     r0, thumb_entry+1
        bx      r0

/* ---------------- Thumb mode --------------- */
        .thumb
thumb_entry:
        movs    r0, r5
        adds    r0, r0, #0x10
        movs    r1, r6
        adds    r1, r1, #0x10
        blx     r1
        nop