| /* SPDX-License-Identifier: BSD-2-Clause */ |
| /* |
| * Copyright (c) 2019, Linaro Limited |
| */ |
| |
| #include <asm.S> |
| #include <elf_common.h> |
| |
| /* |
| * _start() - Entry of ldelf |
| * |
| * See include/ldelf.h for details on TEE Core interaction. |
| * |
| * void start(struct ldelf_arg *arg); |
| */ |
| FUNC _ldelf_start , : |
| /* |
| * First ldelf needs to be relocated. The binary is compiled to |
| * contain only a minimal number of R_ARM_RELATIVE relocations in |
| * read/write memory, leaving read-only and executeble memory |
| * untouched. |
| */ |
| adr r4, reloc_begin_rel |
| ldr r5, reloc_begin_rel |
| ldr r6, reloc_end_rel |
| add r5, r5, r4 |
| add r6, r6, r4 |
| cmp r5, r6 |
| beq 2f |
| |
| adr r4, _ldelf_start /* Get the load offset */ |
| |
| /* Loop over the relocations (Elf32_Rel) and process all entries */ |
| 1: ldmia r5!, {r7-r8} /* r7 == r_offset, r8 = r_info */ |
| and r8, r8, #0xff |
| cmp r8, #R_ARM_RELATIVE |
| /* We're currently only supporting R_ARM_RELATIVE relocations */ |
| bne 3f |
| |
| /* Update the pointer at r_offset + load_offset */ |
| add r7, r7, r4 |
| ldr r8, [r7] |
| add r8, r8, r4 |
| str r8, [r7] |
| |
| cmp r5, r6 |
| blo 1b |
| |
| 2: bl ldelf |
| mov r0, #0 |
| bl utee_return |
| 3: mov r0, #0 |
| bl utee_panic |
| reloc_begin_rel: |
| .word __reloc_begin - reloc_begin_rel |
| reloc_end_rel: |
| .word __reloc_end - reloc_end_rel |
| END_FUNC _ldelf_start |
