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| author |  Clément Léger <cleger@rivosinc.com>
| 2023-10-04 17:13:59 +0200 |
|---|---|---|
| committer |  Palmer Dabbelt <palmer@rivosinc.com>
| 2023-11-01 08:34:53 -0700 |
| commit | 7c83232161f609bbc452a1255f823f41afc411dd (patch) | |
| tree | 8c03bf915d29719e12c25ba4ec0e805b3c5e10de /arch/riscv/include | |
| parent | riscv: remove unused functions in traps_misaligned.c (diff) | |
| download | linux-7c83232161f609bbc452a1255f823f41afc411dd.tar.gz linux-7c83232161f609bbc452a1255f823f41afc411dd.tar.bz2 linux-7c83232161f609bbc452a1255f823f41afc411dd.zip | |
riscv: add support for misaligned trap handling in S-mode
Misalignment trap handling is only supported for M-mode and uses direct
accesses to user memory. In S-mode, when handling usermode fault, this
requires to use the get_user()/put_user() accessors. Implement
load_u8(), store_u8() and get_insn() using these accessors for
userspace and direct text access for kernel.
Signed-off-by: Clément Léger <cleger@rivosinc.com>
Reviewed-by: Björn Töpel <bjorn@rivosinc.com>
Link: https://lore.kernel.org/r/20231004151405.521596-3-cleger@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Diffstat (limited to 'arch/riscv/include')
| -rw-r--r-- | arch/riscv/include/asm/entry-common.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/entry-common.h b/arch/riscv/include/asm/entry-common.h index 6e4dee49d84b..7ab5e34318c8 100644 --- a/arch/riscv/include/asm/entry-common.h +++ b/arch/riscv/include/asm/entry-common.h @@ -8,4 +8,18 @@ void handle_page_fault(struct pt_regs *regs); void handle_break(struct pt_regs *regs); +#ifdef CONFIG_RISCV_MISALIGNED +int handle_misaligned_load(struct pt_regs *regs); +int handle_misaligned_store(struct pt_regs *regs); +#else +static inline int handle_misaligned_load(struct pt_regs *regs) +{ + return -1; +} +static inline int handle_misaligned_store(struct pt_regs *regs) +{ + return -1; +} +#endif + #endif /* _ASM_RISCV_ENTRY_COMMON_H */ |