1/* SPDX-License-Identifier: BSD-2-Clause */ 2/* 3 * Copyright (c) 2019, Linaro Limited 4 */ 5 6#include <asm.S> 7#include <elf_common.h> 8 9/* 10 * _start() - Entry of ldelf 11 * 12 * See include/ldelf.h for details on TEE Core interaction. 13 * 14 * void start(struct ldelf_arg *arg); 15 */ 16FUNC _ldelf_start , : 17 /* 18 * First ldelf needs to be relocated. The binary is compiled to 19 * contain only a minimal number of R_ARM_RELATIVE relocations in 20 * read/write memory, leaving read-only and executeble memory 21 * untouched. 22 */ 23 adr r4, reloc_begin_rel 24 ldr r5, reloc_begin_rel 25 ldr r6, reloc_end_rel 26 add r5, r5, r4 27 add r6, r6, r4 28 cmp r5, r6 29 beq 2f 30 31 adr r4, _ldelf_start /* Get the load offset */ 32 33 /* Loop over the relocations (Elf32_Rel) and process all entries */ 341: ldmia r5!, {r7-r8} /* r7 == r_offset, r8 = r_info */ 35 and r8, r8, #0xff 36 cmp r8, #R_ARM_RELATIVE 37 /* We're currently only supporting R_ARM_RELATIVE relocations */ 38 bne 3f 39 40 /* Update the pointer at r_offset + load_offset */ 41 add r7, r7, r4 42 ldr r8, [r7] 43 add r8, r8, r4 44 str r8, [r7] 45 46 cmp r5, r6 47 blo 1b 48 492: bl ldelf 50 mov r0, #0 51 bl utee_return 523: mov r0, #0 53 bl utee_panic 54reloc_begin_rel: 55 .word __reloc_begin - reloc_begin_rel 56reloc_end_rel: 57 .word __reloc_end - reloc_end_rel 58END_FUNC _ldelf_start 59