linux-kernel - [PATCH 3/3] efistub: fix missed the initialization of gp

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Message-Id: <20240306085622.87248-3-cuiyunhui@bytedance.com>
Date: Wed,  6 Mar 2024 16:56:22 +0800
From: Yunhui Cui <cuiyunhui@...edance.com>
To: paul.walmsley@...ive.com,
	palmer@...belt.com,
	aou@...s.berkeley.edu,
	ardb@...nel.org,
	cuiyunhui@...edance.com,
	xuzhipeng.1973@...edance.com,
	alexghiti@...osinc.com,
	samitolvanen@...gle.com,
	bp@...en8.de,
	xiao.w.wang@...el.com,
	jan.kiszka@...mens.com,
	kirill.shutemov@...ux.intel.com,
	nathan@...nel.org,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-efi@...r.kernel.org
Subject: [PATCH 3/3] efistub: fix missed the initialization of gp

Compared with gcc version 12, gcc version 13 uses the gp
register for compilation optimization, but the efistub module
does not initialize gp.

Signed-off-by: Yunhui Cui <cuiyunhui@...edance.com>
Co-Developed-by: Zhipeng Xu <xuzhipeng.1973@...edance.com>
---
 arch/riscv/kernel/efi-header.S | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/arch/riscv/kernel/efi-header.S b/arch/riscv/kernel/efi-header.S
index 515b2dfbca75..fa17c08c092a 100644
--- a/arch/riscv/kernel/efi-header.S
+++ b/arch/riscv/kernel/efi-header.S
@@ -40,7 +40,7 @@ optional_header:
 	.long	__pecoff_data_virt_end - __pecoff_text_end	// SizeOfInitializedData
 #endif
 	.long	0					// SizeOfUninitializedData
-	.long	__efistub_efi_pe_entry - _start		// AddressOfEntryPoint
+	.long	_efistub_entry - _start		// AddressOfEntryPoint
 	.long	efi_header_end - _start			// BaseOfCode
 #ifdef CONFIG_32BIT
 	.long  __pecoff_text_end - _start		// BaseOfData
@@ -121,4 +121,13 @@ section_table:
 
 	.balign	0x1000
 efi_header_end:
+
+	.global	_efistub_entry
+_efistub_entry:
+	/* Reload the global pointer */
+	load_global_pointer
+
+	call __efistub_efi_pe_entry
+	ret
+
 	.endm
-- 
2.20.1