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binman: Support reading the offset of an ELF-file symbol

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Binman needs to be able to update the contents of an ELF file after it has
been build. To support this, add a function to locate the position of a
symbol's contents within the file.

Fix the comments on bss_data.c and Symbol while we are here.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2021-11-03 21:09:16 -06:00
parent 2fb2cd75f3
commit 056f0efd8b
6 changed files with 131 additions and 5 deletions
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5
tools/binman/test/Makefile
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@@ -31,7 +31,7 @@ LDS_BINMAN_X86 := -T $(SRC)u_boot_binman_syms_x86.lds
TARGETS = u_boot_ucode_ptr u_boot_no_ucode_ptr bss_data \
u_boot_binman_syms u_boot_binman_syms.bin u_boot_binman_syms_bad \
u_boot_binman_syms_size u_boot_binman_syms_x86
u_boot_binman_syms_size u_boot_binman_syms_x86 embed_data
all: $(TARGETS)
@@ -44,6 +44,9 @@ u_boot_ucode_ptr: u_boot_ucode_ptr.c
bss_data: CFLAGS += $(SRC)bss_data.lds
bss_data: bss_data.c
embed_data: CFLAGS += $(SRC)embed_data.lds
embed_data: embed_data.c
u_boot_binman_syms.bin: u_boot_binman_syms
$(OBJCOPY) -O binary $< -R .note.gnu.build-id $@

2
tools/binman/test/bss_data.c
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@@ -2,7 +2,7 @@
/*
* Copyright (c) 2016 Google, Inc
*
* Simple program to create a _dt_ucode_base_size symbol which can be read
* Simple program to create a bss_data region so the symbol can be read
* by binutils. This is used by binman tests.
*/

16
tools/binman/test/embed_data.c Normal file
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@@ -0,0 +1,16 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2021 Google LLC
*
* Simple program including some embedded data that can be accessed by binman.
* This is used by binman tests.
*/
int first[10] = {1};
int embed[3] __attribute__((section(".embed"))) = {0x1234, 0x5678};
int second[10] = {1};
int main(void)
{
return 0;
}

23
tools/binman/test/embed_data.lds Normal file
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@@ -0,0 +1,23 @@
/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright 2021 Google LLC
*/
OUTPUT_FORMAT("elf32-i386", "elf32-i386", "elf32-i386")
OUTPUT_ARCH(i386)
ENTRY(_start)
SECTIONS
{
_start = .;
__data_start = .;
.data :
{
. = ALIGN(32);
embed_start = .;
*(.embed*)
embed_end = .;
. = ALIGN(32);
*(.data*)
}
}