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RISC-V: Don't increment sepc after breakpoint.

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Adding 4 to sepc is pointless, and is wrong if we executed a 2-byte
compressed breakpoint.  This plus a corresponding gdb patch allows
compressed breakpoints to work in gdb.  Gdb maintainers have already
agreed that this is the right approach.

Signed-off-by: Jim Wilson <jimw@sifive.com>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
This commit is contained in:
Jim Wilson 2018-07-14 17:34:39 -07:00 committed by Palmer Dabbelt
parent a89757daf2
commit 758914fea2
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arch/riscv/kernel/traps.c
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@ -138,7 +138,6 @@ asmlinkage void do_trap_break(struct pt_regs *regs)
#endif /* CONFIG_GENERIC_BUG */
force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)(regs->sepc), current);
regs->sepc += 0x4;
}
#ifdef CONFIG_GENERIC_BUG