From: Jim Wilson <jimw@sifive.com> To: linux-riscv@lists.infradead.org Cc: Jim Wilson <jimw@sifive.com>, Palmer Dabbelt <palmer@sifive.com>, Albert Ou <aou@eecs.berkeley.edu>, Atish Patra <atish.patra@wdc.com>, Luc Van Oostenryck <luc.vanoostenryck@gmail.com>, linux-kernel@vger.kernel.org Subject: [PATCH] RISC-V: Don't increment sepc after breakpoint. Date: Sat, 14 Jul 2018 17:34:39 -0700 [thread overview] Message-ID: <20180715003442.32216-1-jimw@sifive.com> (raw) 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> --- arch/riscv/kernel/traps.c | 1 - 1 file changed, 1 deletion(-) diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c index 14fcec5bdd24..ae323071c786 100644 --- a/arch/riscv/kernel/traps.c +++ b/arch/riscv/kernel/traps.c @@ -150,7 +150,6 @@ asmlinkage void do_trap_break(struct pt_regs *regs) #endif /* CONFIG_GENERIC_BUG */ do_trap_siginfo(SIGTRAP, TRAP_BRKPT, regs->sepc, current); - regs->sepc += 0x4; } #ifdef CONFIG_GENERIC_BUG -- 2.17.1
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From: jimw@sifive.com (Jim Wilson) To: linux-riscv@lists.infradead.org Subject: [PATCH] RISC-V: Don't increment sepc after breakpoint. Date: Sat, 14 Jul 2018 17:34:39 -0700 [thread overview] Message-ID: <20180715003442.32216-1-jimw@sifive.com> (raw) 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> --- arch/riscv/kernel/traps.c | 1 - 1 file changed, 1 deletion(-) diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c index 14fcec5bdd24..ae323071c786 100644 --- a/arch/riscv/kernel/traps.c +++ b/arch/riscv/kernel/traps.c @@ -150,7 +150,6 @@ asmlinkage void do_trap_break(struct pt_regs *regs) #endif /* CONFIG_GENERIC_BUG */ do_trap_siginfo(SIGTRAP, TRAP_BRKPT, regs->sepc, current); - regs->sepc += 0x4; } #ifdef CONFIG_GENERIC_BUG -- 2.17.1
next reply other threads:[~2018-07-15 0:37 UTC|newest] Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-07-15 0:34 Jim Wilson [this message] 2018-07-15 0:34 ` [PATCH] RISC-V: Don't increment sepc after breakpoint Jim Wilson
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