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riscv: add macro to get instruction length

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Extract the calculation of instruction length for common use.

Signed-off-by: Zong Li <zong.li@sifive.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
This commit is contained in:
Zong Li 2020-03-10 00:55:42 +08:00 committed by Palmer Dabbelt
parent d27c3c9081
commit b42d763a2d
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2 changed files with 10 additions and 1 deletions
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8
arch/riscv/include/asm/bug.h
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@ -19,6 +19,14 @@
#define __BUG_INSN_32 _UL(0x00100073) /* ebreak */
#define __BUG_INSN_16 _UL(0x9002) /* c.ebreak */
#define GET_INSN_LENGTH(insn) \
({ \
unsigned long __len; \
__len = ((insn & __INSN_LENGTH_MASK) == __INSN_LENGTH_32) ? \
4UL : 2UL; \
__len; \
})
typedef u32 bug_insn_t;
#ifdef CONFIG_GENERIC_BUG_RELATIVE_POINTERS

3
arch/riscv/kernel/traps.c
View File

@ -118,7 +118,8 @@ static inline unsigned long get_break_insn_length(unsigned long pc)
if (probe_kernel_address((bug_insn_t *)pc, insn))
return 0;
return (((insn & __INSN_LENGTH_MASK) == __INSN_LENGTH_32) ? 4UL : 2UL);
return GET_INSN_LENGTH(insn);
}
asmlinkage __visible void do_trap_break(struct pt_regs *regs)