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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* Copyright (c) 2019, Linaro Limited
* Copyright (c) 2020, Arm 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 _ldelf_return
3: mov r0, #0
bl _ldelf_panic
reloc_begin_rel:
.word __reloc_begin - reloc_begin_rel
reloc_end_rel:
.word __reloc_end - reloc_end_rel
END_FUNC _ldelf_start
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