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https://github.com/torvalds/linux
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b51fc88cb3
Charlie Jenkins <charlie@rivosinc.com> says: A handful of module relocations were missing, this patch includes the remaining ones. I also wrote some test cases to ensure that module loading works properly. Some relocations cannot be supported in the kernel, these include the ones that rely on thread local storage and dynamic linking. This patch also overhauls the implementation of ADD/SUB/SET/ULEB128 relocations to handle overflow. "Overflow" is different for ULEB128 since it is a variable-length encoding that the compiler can be expected to generate enough space for. Instead of overflowing, ULEB128 will expand into the next 8-bit segment of the location. A psABI proposal [1] was merged that mandates that SET_ULEB128 and SUB_ULEB128 are paired, however the discussion following the merging of the pull request revealed that while the pull request was valid, it would be better for linkers to properly handle this overflow. This patch proactively implements this methodology for future compatibility. This can be tested by enabling KUNIT, RUNTIME_KERNEL_TESTING_MENU, and RISCV_MODULE_LINKING_KUNIT. [1] https://github.com/riscv-non-isa/riscv-elf-psabi-doc/pull/403 * b4-shazam-merge: riscv: Add tests for riscv module loading riscv: Add remaining module relocations riscv: Avoid unaligned access when relocating modules Link: https://lore.kernel.org/r/20231101-module_relocations-v9-0-8dfa3483c400@rivosinc.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
105 lines
2.8 KiB
Makefile
105 lines
2.8 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0-only
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#
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# Makefile for the RISC-V Linux kernel
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#
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ifdef CONFIG_FTRACE
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CFLAGS_REMOVE_ftrace.o = $(CC_FLAGS_FTRACE)
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CFLAGS_REMOVE_patch.o = $(CC_FLAGS_FTRACE)
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CFLAGS_REMOVE_sbi.o = $(CC_FLAGS_FTRACE)
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endif
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CFLAGS_syscall_table.o += $(call cc-option,-Wno-override-init,)
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CFLAGS_compat_syscall_table.o += $(call cc-option,-Wno-override-init,)
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ifdef CONFIG_KEXEC
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AFLAGS_kexec_relocate.o := -mcmodel=medany $(call cc-option,-mno-relax)
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endif
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# cmodel=medany and notrace when patching early
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ifdef CONFIG_RISCV_ALTERNATIVE_EARLY
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CFLAGS_alternative.o := -mcmodel=medany
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CFLAGS_cpufeature.o := -mcmodel=medany
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ifdef CONFIG_FTRACE
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CFLAGS_REMOVE_alternative.o = $(CC_FLAGS_FTRACE)
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CFLAGS_REMOVE_cpufeature.o = $(CC_FLAGS_FTRACE)
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endif
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ifdef CONFIG_RELOCATABLE
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CFLAGS_alternative.o += -fno-pie
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CFLAGS_cpufeature.o += -fno-pie
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endif
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ifdef CONFIG_KASAN
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KASAN_SANITIZE_alternative.o := n
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KASAN_SANITIZE_cpufeature.o := n
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endif
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endif
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extra-y += vmlinux.lds
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obj-y += head.o
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obj-y += soc.o
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obj-$(CONFIG_RISCV_ALTERNATIVE) += alternative.o
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obj-y += copy-unaligned.o
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obj-y += cpu.o
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obj-y += cpufeature.o
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obj-y += entry.o
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obj-y += irq.o
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obj-y += process.o
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obj-y += ptrace.o
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obj-y += reset.o
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obj-y += setup.o
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obj-y += signal.o
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obj-y += syscall_table.o
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obj-y += sys_riscv.o
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obj-y += time.o
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obj-y += traps.o
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obj-y += riscv_ksyms.o
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obj-y += stacktrace.o
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obj-y += cacheinfo.o
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obj-y += patch.o
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obj-y += probes/
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obj-y += tests/
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obj-$(CONFIG_MMU) += vdso.o vdso/
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obj-$(CONFIG_RISCV_MISALIGNED) += traps_misaligned.o
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obj-$(CONFIG_FPU) += fpu.o
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obj-$(CONFIG_RISCV_ISA_V) += vector.o
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obj-$(CONFIG_SMP) += smpboot.o
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obj-$(CONFIG_SMP) += smp.o
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obj-$(CONFIG_SMP) += cpu_ops.o
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obj-$(CONFIG_RISCV_BOOT_SPINWAIT) += cpu_ops_spinwait.o
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obj-$(CONFIG_MODULES) += module.o
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obj-$(CONFIG_MODULE_SECTIONS) += module-sections.o
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obj-$(CONFIG_CPU_PM) += suspend_entry.o suspend.o
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obj-$(CONFIG_HIBERNATION) += hibernate.o hibernate-asm.o
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obj-$(CONFIG_FUNCTION_TRACER) += mcount.o ftrace.o
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obj-$(CONFIG_DYNAMIC_FTRACE) += mcount-dyn.o
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obj-$(CONFIG_PERF_EVENTS) += perf_callchain.o
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obj-$(CONFIG_HAVE_PERF_REGS) += perf_regs.o
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obj-$(CONFIG_RISCV_SBI) += sbi.o
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ifeq ($(CONFIG_RISCV_SBI), y)
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obj-$(CONFIG_SMP) += sbi-ipi.o
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obj-$(CONFIG_SMP) += cpu_ops_sbi.o
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endif
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obj-$(CONFIG_HOTPLUG_CPU) += cpu-hotplug.o
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obj-$(CONFIG_KGDB) += kgdb.o
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obj-$(CONFIG_KEXEC_CORE) += kexec_relocate.o crash_save_regs.o machine_kexec.o
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obj-$(CONFIG_KEXEC_FILE) += elf_kexec.o machine_kexec_file.o
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obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
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obj-$(CONFIG_CRASH_CORE) += crash_core.o
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obj-$(CONFIG_JUMP_LABEL) += jump_label.o
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obj-$(CONFIG_CFI_CLANG) += cfi.o
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obj-$(CONFIG_EFI) += efi.o
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obj-$(CONFIG_COMPAT) += compat_syscall_table.o
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obj-$(CONFIG_COMPAT) += compat_signal.o
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obj-$(CONFIG_COMPAT) += compat_vdso/
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obj-$(CONFIG_64BIT) += pi/
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obj-$(CONFIG_ACPI) += acpi.o
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