linux.git/arch/riscv/kernel/module.c, branch v5.4.158

riscv: avoid the PIC offset of static percpu data in module beyond 2G limits

2020-03-25T07:25:48+00:00

[ Upstream commit 0cff8bff7af886af0923d5c91776cd51603e531f ]

The compiler uses the PIC-relative method to access static variables
instead of GOT when the code model is PIC. Therefore, the limitation of
the access range from the instruction to the symbol address is +-2GB.
Under this circumstance, the kernel cannot load a kernel module if this
module has static per-CPU symbols declared by DEFINE_PER_CPU(). The reason
is that kernel relocates the .data..percpu section of the kernel module to
the end of kernel's .data..percpu. Hence, the distance between the per-CPU
symbols and the instruction will exceed the 2GB limits. To solve this
problem, the kernel should place the loaded module in the memory area
[&_end-2G, VMALLOC_END].

Signed-off-by: Vincent Chen 
Suggested-by: Alexandre Ghiti 
Suggested-by: Anup Patel 
Tested-by: Alexandre Ghiti 
Tested-by: Carlos de Paula 
Signed-off-by: Palmer Dabbelt 
Signed-off-by: Sasha Levin

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157

2019-05-30T18:26:37+00:00

Based on 3 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version this program is distributed in the
  hope that it will be useful but without any warranty without even
  the implied warranty of merchantability or fitness for a particular
  purpose see the gnu general public license for more details

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version [author] [kishon] [vijay] [abraham]
  [i] [kishon]@[ti] [com] this program is distributed in the hope that
  it will be useful but without any warranty without even the implied
  warranty of merchantability or fitness for a particular purpose see
  the gnu general public license for more details

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version [author] [graeme] [gregory]
  [gg]@[slimlogic] [co] [uk] [author] [kishon] [vijay] [abraham] [i]
  [kishon]@[ti] [com] [based] [on] [twl6030]_[usb] [c] [author] [hema]
  [hk] [hemahk]@[ti] [com] this program is distributed in the hope
  that it will be useful but without any warranty without even the
  implied warranty of merchantability or fitness for a particular
  purpose see the gnu general public license for more details

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1105 file(s).

Signed-off-by: Thomas Gleixner 
Reviewed-by: Allison Randal 
Reviewed-by: Richard Fontana 
Reviewed-by: Kate Stewart 
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.202006027@linutronix.de
Signed-off-by: Greg Kroah-Hartman

RISC-V: Use IS_ENABLED(CONFIG_CMODEL_MEDLOW)

2019-03-29T06:18:51+00:00

IS_ENABLED should generally use CONFIG_ prefaced symbols and
it doesn't appear as if there is a CMODEL_MEDLOW define.

Signed-off-by: Joe Perches 
Reviewed-by: Christoph Hellwig 
Signed-off-by: Palmer Dabbelt

RISC-V: Silence some module warnings on 32-bit

2018-11-13T02:12:24+00:00

Fixes:

arch/riscv/kernel/module.c: In function 'apply_r_riscv_32_rela':
./include/linux/kern_levels.h:5:18: warning: format '%llx' expects argument of type 'long long unsigned int', but argument 3 has type 'Elf32_Addr' {aka 'unsigned int'} [-Wformat=]
arch/riscv/kernel/module.c:23:27: note: format string is defined here
arch/riscv/kernel/module.c: In function 'apply_r_riscv_pcrel_hi20_rela':
./include/linux/kern_levels.h:5:18: warning: format '%llx' expects argument of type 'long long unsigned int', but argument 3 has type 'Elf32_Addr' {aka 'unsigned int'} [-Wformat=]
arch/riscv/kernel/module.c:104:23: note: format string is defined here
arch/riscv/kernel/module.c: In function 'apply_r_riscv_hi20_rela':
./include/linux/kern_levels.h:5:18: warning: format '%llx' expects argument of type 'long long unsigned int', but argument 3 has type 'Elf32_Addr' {aka 'unsigned int'} [-Wformat=]
arch/riscv/kernel/module.c:146:23: note: format string is defined here
arch/riscv/kernel/module.c: In function 'apply_r_riscv_got_hi20_rela':
./include/linux/kern_levels.h:5:18: warning: format '%llx' expects argument of type 'long long unsigned int', but argument 3 has type 'Elf32_Addr' {aka 'unsigned int'} [-Wformat=]
arch/riscv/kernel/module.c:190:60: note: format string is defined here
arch/riscv/kernel/module.c: In function 'apply_r_riscv_call_plt_rela':
./include/linux/kern_levels.h:5:18: warning: format '%llx' expects argument of type 'long long unsigned int', but argument 3 has type 'Elf32_Addr' {aka 'unsigned int'} [-Wformat=]
arch/riscv/kernel/module.c:214:24: note: format string is defined here
arch/riscv/kernel/module.c: In function 'apply_r_riscv_call_rela':
./include/linux/kern_levels.h:5:18: warning: format '%llx' expects argument of type 'long long unsigned int', but argument 3 has type 'Elf32_Addr' {aka 'unsigned int'} [-Wformat=]
arch/riscv/kernel/module.c:236:23: note: format string is defined here

Signed-off-by: Olof Johansson 
Signed-off-by: Palmer Dabbelt

RISC-V: Fix the rv32i kernel build

2018-07-04T21:12:53+00:00

These patches for building 32-bit RISC-V kernel.
 - Fix the compile errors and warnings on RV32I.
 - Fix some incompatible problem on RV32I.
 - Add format.h for compatible of print format.

The fixed width integer types format for Elf_Addr will move to
generic header by another patch. For now, there are some warning
about unexpected argument of type on RV32I.

Change in v1:
 - Fix some error in v1
 - Remove implementation of fixed width integer types format for Elf_Addr.

RISC-V: fix R_RISCV_ADD32/R_RISCV_SUB32 relocations

2018-07-04T21:12:34+00:00

The R_RISCV_ADD32/R_RISCV_SUB32 relocations should add/subtract the
address of the symbol (without overflow check), not its contents.

Signed-off-by: Andreas Schwab 
Signed-off-by: Palmer Dabbelt

RISC-V: Change variable type for 32-bit compatible

2018-07-04T20:56:52+00:00

Signed-off-by: Zong Li 
Reviewed-by: Christoph Hellwig 
Signed-off-by: Palmer Dabbelt

RISC-V: Handle R_RISCV_32 in modules

2018-06-11T16:04:34+00:00

With CONFIG_MODVERSIONS=y the R_RISCV_32 relocation is used by the
__kcrctab section.

Signed-off-by: Andreas Schwab 
Signed-off-by: Palmer Dabbelt

RISC-V: Support SUB32 relocation type in kernel module

2018-04-03T03:00:55+00:00

Signed-off-by: Zong Li 
Signed-off-by: Palmer Dabbelt

RISC-V: Support ADD32 relocation type in kernel module

2018-04-03T03:00:55+00:00

Signed-off-by: Zong Li 
Signed-off-by: Palmer Dabbelt