Jisheng Zhang bb1f85d604 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>		2022-01-05 17:52:20 -08:00
..
delay.c	include/linux/delay.h: replace kernel.h with the necessary inclusions	2021-11-09 10:02:49 -08:00
error-inject.c	riscv: Add support for function error injection	2021-01-14 15:09:09 -08:00
Makefile	riscv: Add support for function error injection	2021-01-14 15:09:09 -08:00
memcpy.S	riscv: Add KASAN support	2020-01-22 13:09:58 -08:00
memmove.S	riscv: provide memmove implementation	2020-12-10 17:27:54 -08:00
memset.S	riscv: Add KASAN support	2020-01-22 13:09:58 -08:00
tishift.S	riscv: Less inefficient gcc tishift helpers (and export their symbols)	2020-01-18 19:13:41 -08:00
uaccess.S	riscv: switch to relative exception tables	2022-01-05 17:52:20 -08:00