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de658bcf |
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09-May-2023 |
Jisheng Zhang <jszhang@kernel.org> |
riscv: mm: stub extable related functions/macros for !MMU extable relies on the MMU to work properly, so it's useless to include __ex_table sections and build extable related functions for !MMU case. Signed-off-by: Jisheng Zhang <jszhang@kernel.org> Link: https://lore.kernel.org/r/20230509152641.805-1-jszhang@kernel.org Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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2bf847db |
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18-Nov-2021 |
Jisheng Zhang <jszhang@kernel.org> |
riscv: extable: add `type` and `data` fields This is a riscv port of commit d6e2cc564775 ("arm64: extable: add `type` and `data` fields"). Signed-off-by: Jisheng Zhang <jszhang@kernel.org> Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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ef127bca |
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18-Nov-2021 |
Jisheng Zhang <jszhang@kernel.org> |
riscv: extable: make fixup_exception() return bool The return values of fixup_exception() and riscv_bpf_fixup_exception() represent a boolean condition rather than an error code, so it's better to return `bool` rather than `int`. Signed-off-by: Jisheng Zhang <jszhang@kernel.org> Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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c07935cb |
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18-Nov-2021 |
Jisheng Zhang <jszhang@kernel.org> |
riscv: bpf: move rv_bpf_fixup_exception signature to extable.h This is to group riscv related extable related functions signature into one file. Signed-off-by: Jisheng Zhang <jszhang@kernel.org> Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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bb1f85d6 |
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18-Nov-2021 |
Jisheng Zhang <jszhang@kernel.org> |
riscv: switch to relative exception tables Similar as other architectures such as arm64, x86 and so on, use offsets relative to the exception table entry values rather than absolute addresses for both the exception locationand the fixup. However, RISCV label difference will actually produce two relocations, a pair of R_RISCV_ADD32 and R_RISCV_SUB32. Take below simple code for example: $ cat test.S .section .text 1: nop .section __ex_table,"a" .balign 4 .long (1b - .) .previous $ riscv64-linux-gnu-gcc -c test.S $ riscv64-linux-gnu-readelf -r test.o Relocation section '.rela__ex_table' at offset 0x100 contains 2 entries: Offset Info Type Sym. Value Sym. Name + Addend 000000000000 000600000023 R_RISCV_ADD32 0000000000000000 .L1^B1 + 0 000000000000 000500000027 R_RISCV_SUB32 0000000000000000 .L0 + 0 The modpost will complain the R_RISCV_SUB32 relocation, so we need to patch modpost.c to skip this relocation for .rela__ex_table section. After this patch, the __ex_table section size of defconfig vmlinux is reduced from 7072 Bytes to 3536 Bytes. Signed-off-by: Jisheng Zhang <jszhang@kernel.org> Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com> Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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