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From: Emil Renner Berthing <kernel@esmil.dk>
To: linux-riscv@lists.infradead.org
Cc: "Emil Renner Berthing" <kernel@esmil.dk>,
	"Palmer Dabbelt" <palmer@dabbelt.com>,
	"Björn Töpel" <bjorn.topel@gmail.com>,
	"Paul Walmsley" <paul.walmsley@sifive.com>,
	"Jonathan Corbet" <corbet@lwn.net>,
	linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v3 1/2] riscv: Support R_RISCV_ADD64 and R_RISCV_SUB64 relocs
Date: Tue, 14 Jul 2020 09:40:43 +0200	[thread overview]
Message-ID: <20200714074044.10031-1-kernel@esmil.dk> (raw)

These are needed for the __jump_table in modules using
static keys/jump-labels with the layout from
HAVE_ARCH_JUMP_LABEL_RELATIVE on 64bit kernels.

Signed-off-by: Emil Renner Berthing <kernel@esmil.dk>
Reviewed-by: Björn Töpel <bjorn.topel@gmail.com>
Tested-by: Björn Töpel <bjorn.topel@gmail.com>
---
Tested on the HiFive Unleashed board.

No changes since v2.

This patch is new in v2. It fixes an error loading modules
containing static keys found by Björn Töpel.

 arch/riscv/kernel/module.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/arch/riscv/kernel/module.c b/arch/riscv/kernel/module.c
index 7191342c54da..104fba889cf7 100644
--- a/arch/riscv/kernel/module.c
+++ b/arch/riscv/kernel/module.c
@@ -263,6 +263,13 @@ static int apply_r_riscv_add32_rela(struct module *me, u32 *location,
 	return 0;
 }
 
+static int apply_r_riscv_add64_rela(struct module *me, u32 *location,
+				    Elf_Addr v)
+{
+	*(u64 *)location += (u64)v;
+	return 0;
+}
+
 static int apply_r_riscv_sub32_rela(struct module *me, u32 *location,
 				    Elf_Addr v)
 {
@@ -270,6 +277,13 @@ static int apply_r_riscv_sub32_rela(struct module *me, u32 *location,
 	return 0;
 }
 
+static int apply_r_riscv_sub64_rela(struct module *me, u32 *location,
+				    Elf_Addr v)
+{
+	*(u64 *)location -= (u64)v;
+	return 0;
+}
+
 static int (*reloc_handlers_rela[]) (struct module *me, u32 *location,
 				Elf_Addr v) = {
 	[R_RISCV_32]			= apply_r_riscv_32_rela,
@@ -290,7 +304,9 @@ static int (*reloc_handlers_rela[]) (struct module *me, u32 *location,
 	[R_RISCV_RELAX]			= apply_r_riscv_relax_rela,
 	[R_RISCV_ALIGN]			= apply_r_riscv_align_rela,
 	[R_RISCV_ADD32]			= apply_r_riscv_add32_rela,
+	[R_RISCV_ADD64]			= apply_r_riscv_add64_rela,
 	[R_RISCV_SUB32]			= apply_r_riscv_sub32_rela,
+	[R_RISCV_SUB64]			= apply_r_riscv_sub64_rela,
 };
 
 int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
-- 
2.27.0


WARNING: multiple messages have this Message-ID (diff)
From: Emil Renner Berthing <kernel@esmil.dk>
To: linux-riscv@lists.infradead.org
Cc: "Emil Renner Berthing" <kernel@esmil.dk>,
	"Jonathan Corbet" <corbet@lwn.net>,
	"Björn Töpel" <bjorn.topel@gmail.com>,
	linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
	"Palmer Dabbelt" <palmer@dabbelt.com>,
	"Paul Walmsley" <paul.walmsley@sifive.com>
Subject: [PATCH v3 1/2] riscv: Support R_RISCV_ADD64 and R_RISCV_SUB64 relocs
Date: Tue, 14 Jul 2020 09:40:43 +0200	[thread overview]
Message-ID: <20200714074044.10031-1-kernel@esmil.dk> (raw)

These are needed for the __jump_table in modules using
static keys/jump-labels with the layout from
HAVE_ARCH_JUMP_LABEL_RELATIVE on 64bit kernels.

Signed-off-by: Emil Renner Berthing <kernel@esmil.dk>
Reviewed-by: Björn Töpel <bjorn.topel@gmail.com>
Tested-by: Björn Töpel <bjorn.topel@gmail.com>
---
Tested on the HiFive Unleashed board.

No changes since v2.

This patch is new in v2. It fixes an error loading modules
containing static keys found by Björn Töpel.

 arch/riscv/kernel/module.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/arch/riscv/kernel/module.c b/arch/riscv/kernel/module.c
index 7191342c54da..104fba889cf7 100644
--- a/arch/riscv/kernel/module.c
+++ b/arch/riscv/kernel/module.c
@@ -263,6 +263,13 @@ static int apply_r_riscv_add32_rela(struct module *me, u32 *location,
 	return 0;
 }
 
+static int apply_r_riscv_add64_rela(struct module *me, u32 *location,
+				    Elf_Addr v)
+{
+	*(u64 *)location += (u64)v;
+	return 0;
+}
+
 static int apply_r_riscv_sub32_rela(struct module *me, u32 *location,
 				    Elf_Addr v)
 {
@@ -270,6 +277,13 @@ static int apply_r_riscv_sub32_rela(struct module *me, u32 *location,
 	return 0;
 }
 
+static int apply_r_riscv_sub64_rela(struct module *me, u32 *location,
+				    Elf_Addr v)
+{
+	*(u64 *)location -= (u64)v;
+	return 0;
+}
+
 static int (*reloc_handlers_rela[]) (struct module *me, u32 *location,
 				Elf_Addr v) = {
 	[R_RISCV_32]			= apply_r_riscv_32_rela,
@@ -290,7 +304,9 @@ static int (*reloc_handlers_rela[]) (struct module *me, u32 *location,
 	[R_RISCV_RELAX]			= apply_r_riscv_relax_rela,
 	[R_RISCV_ALIGN]			= apply_r_riscv_align_rela,
 	[R_RISCV_ADD32]			= apply_r_riscv_add32_rela,
+	[R_RISCV_ADD64]			= apply_r_riscv_add64_rela,
 	[R_RISCV_SUB32]			= apply_r_riscv_sub32_rela,
+	[R_RISCV_SUB64]			= apply_r_riscv_sub64_rela,
 };
 
 int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
-- 
2.27.0


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             reply	other threads:[~2020-07-14  7:44 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-14  7:40 Emil Renner Berthing [this message]
2020-07-14  7:40 ` [PATCH v3 1/2] riscv: Support R_RISCV_ADD64 and R_RISCV_SUB64 relocs Emil Renner Berthing
2020-07-14  7:40 ` [PATCH v3 2/2] riscv: Add jump-label implementation Emil Renner Berthing
2020-07-14  7:40   ` Emil Renner Berthing
2020-07-21  0:54 ` [PATCH v3 1/2] riscv: Support R_RISCV_ADD64 and R_RISCV_SUB64 relocs Palmer Dabbelt
2020-07-21  0:54   ` Palmer Dabbelt

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