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Message-Id: <20200629155309.2495516-48-sashal@kernel.org> Date: Mon, 29 Jun 2020 11:51:41 -0400 From: Sasha Levin <sashal@...nel.org> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org Cc: Stafford Horne <shorne@...il.com>, Sasha Levin <sashal@...nel.org> Subject: [PATCH 4.4 047/135] openrisc: Fix issue with argument clobbering for clone/fork From: Stafford Horne <shorne@...il.com> [ Upstream commit 6bd140e14d9aaa734ec37985b8b20a96c0ece948 ] Working on the OpenRISC glibc port I found that sometimes clone was working strange. That the tls data argument sent in r7 was always wrong. Further investigation revealed that the arguments were getting clobbered in the entry code. This patch removes the code that writes to the argument registers. This was likely due to some old code hanging around. This patch fixes this up for clone and fork. This fork clobber is harmless but also useless so remove. Signed-off-by: Stafford Horne <shorne@...il.com> Signed-off-by: Sasha Levin <sashal@...nel.org> --- arch/openrisc/kernel/entry.S | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/openrisc/kernel/entry.S b/arch/openrisc/kernel/entry.S index c17e8451d9978..3fbe420f49c43 100644 --- a/arch/openrisc/kernel/entry.S +++ b/arch/openrisc/kernel/entry.S @@ -1092,13 +1092,13 @@ ENTRY(__sys_clone) l.movhi r29,hi(sys_clone) l.ori r29,r29,lo(sys_clone) l.j _fork_save_extra_regs_and_call - l.addi r7,r1,0 + l.nop ENTRY(__sys_fork) l.movhi r29,hi(sys_fork) l.ori r29,r29,lo(sys_fork) l.j _fork_save_extra_regs_and_call - l.addi r3,r1,0 + l.nop ENTRY(sys_rt_sigreturn) l.j _sys_rt_sigreturn -- 2.25.1
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