linux-kernel - [PATCH v2 2/2] openrisc: Add support for more module relocations

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Message-ID: <20240411164234.1997000-3-shorne@gmail.com>
Date: Thu, 11 Apr 2024 17:42:32 +0100
From: Stafford Horne <shorne@...il.com>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Linux OpenRISC <linux-openrisc@...r.kernel.org>,
	Stafford Horne <shorne@...il.com>,
	Jonas Bonn <jonas@...thpole.se>,
	Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>
Subject: [PATCH v2 2/2] openrisc: Add support for more module relocations

When testing modules in OpenRISC I found R_OR1K_AHI16 (signed adjusted
high 16-bit) and R_OR1K_SLO16 (split low 16-bit) relocations are used in
modules but not implemented yet.

This patch implements the relocations. I have tested with a few modules.

Signed-off-by: Stafford Horne <shorne@...il.com>
---
 arch/openrisc/kernel/module.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/openrisc/kernel/module.c b/arch/openrisc/kernel/module.c
index 292f0afe27b9..c9ff4c4a0b29 100644
--- a/arch/openrisc/kernel/module.c
+++ b/arch/openrisc/kernel/module.c
@@ -55,6 +55,16 @@ int apply_relocate_add(Elf32_Shdr *sechdrs,
 			value |= *location & 0xfc000000;
 			*location = value;
 			break;
+		case R_OR1K_AHI16:
+			/* Adjust the operand to match with a signed LO16.  */
+			value += 0x8000;
+			*((uint16_t *)location + 1) = value >> 16;
+			break;
+		case R_OR1K_SLO16:
+			/* Split value lower 16-bits.  */
+			value = ((value & 0xf800) << 10) | (value & 0x7ff);
+			*location = (*location & ~0x3e007ff) | value;
+			break;
 		default:
 			pr_err("module %s: Unknown relocation: %u\n",
 			       me->name, ELF32_R_TYPE(rel[i].r_info));
-- 
2.44.0