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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_AARCH64_RELATIVE relocations
* in read/write memory, leaving read-only and executeble memory
* untouched.
*/
adr x4, reloc_begin_rel
ldr w5, reloc_begin_rel
ldr w6, reloc_end_rel
add x5, x5, x4
add x6, x6, x4
cmp x5, x6
beq 2f
adr x4, _ldelf_start /* Get the load offset */
/* Loop over the relocations (Elf64_Rela) and process all entries */
1: ldp x7, x8, [x5], #16 /* x7 = r_offset, x8 = r_info */
ldr x9, [x5], #8 /* x9 = r_addend */
and x8, x8, #0xffffffff
cmp x8, #R_AARCH64_RELATIVE
/* We're currently only supporting R_AARCH64_RELATIVE relocations */
bne 3f
/*
* Update the pointer at r_offset + load_offset with r_addend +
* load_offset.
*/
add x7, x7, x4
add x9, x9, x4
str x9, [x7]
cmp x5, x6
blo 1b
2: bl ldelf
mov x0, #0
bl _ldelf_return
3: mov x0, #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
BTI(emit_aarch64_feature_1_and GNU_PROPERTY_AARCH64_FEATURE_1_BTI)
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