From d30bde36d5b7a7ad74176ddf9ede4d7eb2bca86b Mon Sep 17 00:00:00 2001
From: Anup Patel <anup.patel@wdc.com>
Date: Wed, 22 Dec 2021 18:01:23 +0530
Subject: firmware: Move memcpy/memset mapping to fw_base.S

Some of the external firmwares using OpenSBI as library are facing
issues with the weak memcpy() and memset() aliases in libsbi.a so
we move these to fw_base.S. This way mapping of implicit memcpy()
or memset() calls to sbi_memcpy() or sbi_memset() will only be done
for OpenSBI firmwares.
(Refer, https://github.com/riscv-software-src/opensbi/issues/234)

In addition, we also add memmove() and memcmp() mappings in fw_base.S
because as-per the GCC documentation the freestanding environment must
provide memcpy(), memmove(), memset(), and memcmp().

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
---
 firmware/fw_base.S | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

(limited to 'firmware')

diff --git a/firmware/fw_base.S b/firmware/fw_base.S
index 1569e60..ab3e1b3 100644
--- a/firmware/fw_base.S
+++ b/firmware/fw_base.S
@@ -561,6 +561,34 @@ fw_platform_init:
 	add	a0, a1, zero
 	ret
 
+	/* Map implicit memcpy() added by compiler to sbi_memcpy() */
+	.section .text
+	.align 3
+	.globl memcpy
+memcpy:
+	tail	sbi_memcpy
+
+	/* Map implicit memset() added by compiler to sbi_memset() */
+	.section .text
+	.align 3
+	.globl memset
+memset:
+	tail	sbi_memset
+
+	/* Map implicit memmove() added by compiler to sbi_memmove() */
+	.section .text
+	.align 3
+	.globl memmove
+memmove:
+	tail	sbi_memmove
+
+	/* Map implicit memcmp() added by compiler to sbi_memcmp() */
+	.section .text
+	.align 3
+	.globl memcmp
+memcmp:
+	tail	sbi_memcmp
+
 .macro	TRAP_SAVE_AND_SETUP_SP_T0
 	/* Swap TP and MSCRATCH */
 	csrrw	tp, CSR_MSCRATCH, tp
-- 
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