linux-kernel - [PATCH v2 04/11] RISC-V: Support CALL relocation type in kernel module

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Message-ID: <9b02b60c51c87f144e7e24aefd9754e32883ca8a.1521103172.git.zong@andestech.com>
Date:   Thu, 15 Mar 2018 16:50:44 +0800
From:   Zong Li <zong@...estech.com>
To:     <palmer@...ive.com>, <albert@...ive.com>,
        <linux-riscv@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <zong@...estech.com>, <zongbox@...il.com>
CC:     <greentime@...estech.com>
Subject: [PATCH v2 04/11] RISC-V: Support CALL relocation type in kernel module

Signed-off-by: Zong Li <zong@...estech.com>
---
 arch/riscv/kernel/module.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/arch/riscv/kernel/module.c b/arch/riscv/kernel/module.c
index be717bd7cea7..3f2730840c25 100644
--- a/arch/riscv/kernel/module.c
+++ b/arch/riscv/kernel/module.c
@@ -141,6 +141,27 @@ static int apply_r_riscv_call_plt_rela(struct module *me, u32 *location,
 	return 0;
 }
 
+static int apply_r_riscv_call_rela(struct module *me, u32 *location,
+				   Elf_Addr v)
+{
+	s64 offset = (void *)v - (void *)location;
+	s32 fill_v = offset;
+	u32 hi20, lo12;
+
+	if (offset != fill_v) {
+		pr_err(
+		  "%s: target %016llx can not be addressed by the 32-bit offset from PC = %p\n",
+		  me->name, v, location);
+		return -EINVAL;
+	}
+
+	hi20 = (offset + 0x800) & 0xfffff000;
+	lo12 = (offset - hi20) & 0xfff;
+	*location = (*location & 0xfff) | hi20;
+	*(location + 1) = (*(location + 1) & 0xfffff) | (lo12 << 20);
+	return 0;
+}
+
 static int apply_r_riscv_relax_rela(struct module *me, u32 *location,
 				    Elf_Addr v)
 {
@@ -157,6 +178,7 @@ static int (*reloc_handlers_rela[]) (struct module *me, u32 *location,
 	[R_RISCV_PCREL_LO12_S]		= apply_r_riscv_pcrel_lo12_s_rela,
 	[R_RISCV_GOT_HI20]		= apply_r_riscv_got_hi20_rela,
 	[R_RISCV_CALL_PLT]		= apply_r_riscv_call_plt_rela,
+	[R_RISCV_CALL]			= apply_r_riscv_call_rela,
 	[R_RISCV_RELAX]			= apply_r_riscv_relax_rela,
 };
 
-- 
2.16.1