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From 36b5fa3f4db49ac7aef42ff1d58a895226c7e96c Mon Sep 17 00:00:00 2001
From: Jaxson Han <jaxson.han@arm.com>
Date: Tue, 2 Nov 2021 15:10:28 +0800
Subject: [PATCH] lds: Rearrange and mark the sections
To make it possible for the next stage to protect sections with MPU,
boot-wrapper needs to provide the text and data section information.
By rearranging the .data .rodata and .vector sections, all sections
can be split into 2 big sections:
- RO and Executable
- RW and Non-Executable
Add firmware_data to mark the boundry, thus:
firmware_start to firmware_data - 1 indicates RO and Executable section,
firmware_data to firmware_end - 1 indicates RW and Non-Executable
section.
Also, the firmware_data and firmware_end should align with 64 bytes,
since Armv8R AArch64 MPU requires it.
Issue-ID: SCM-3816
Upstream-Status: Inappropriate [other]
Implementation pending further discussion
Signed-off-by: Jaxson Han <jaxson.han@arm.com>
Change-Id: I55342aa7492f2c7b5c16ab9a6472c8cb45cff8fd
---
model.lds.S | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/model.lds.S b/model.lds.S
index ab98ddf..85451f9 100644
--- a/model.lds.S
+++ b/model.lds.S
@@ -63,12 +63,16 @@ SECTIONS
}
#endif
+#define FIRMWARE_ALIGN . = ALIGN(1 << 6)
.boot PHYS_OFFSET: {
PROVIDE(firmware_start = .);
*(.init)
*(.text*)
- *(.data* .rodata* .bss* COMMON)
*(.vectors)
+ *(.rodata*)
+ FIRMWARE_ALIGN;
+ PROVIDE(firmware_data = .);
+ *(.data* .bss* COMMON)
*(.stack)
PROVIDE(etext = .);
}
@@ -77,6 +81,7 @@ SECTIONS
mbox = .;
QUAD(0x0)
}
+ FIRMWARE_ALIGN;
PROVIDE(firmware_end = .);
ASSERT(etext <= (PHYS_OFFSET + TEXT_LIMIT), ".text overflow!")
--
2.25.1
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