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From: guoren@kernel.org
To: arnd@arndb.de
Cc: linux-kernel@vger.kernel.org, linux-csky@vger.kernel.org,
	Guo Ren <guoren@linux.alibaba.com>
Subject: [PATCH 06/11] csky: Fixup get wrong psr value from phyical reg
Date: Fri,  3 Apr 2020 12:41:45 +0800	[thread overview]
Message-ID: <20200403044150.20562-6-guoren@kernel.org> (raw)
In-Reply-To: <20200403044150.20562-1-guoren@kernel.org>

From: Guo Ren <guoren@linux.alibaba.com>

We should get psr value from regs->psr in stack, not directly get
it from phyiscal register then save the vector number in
tsk->trap_no.

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
---
 arch/csky/include/asm/processor.h |  1 +
 arch/csky/kernel/traps.c          | 11 ++++++++++-
 arch/csky/mm/fault.c              |  7 +++++++
 3 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/arch/csky/include/asm/processor.h b/arch/csky/include/asm/processor.h
index 21e0bd5293dd..c6bcd7f7c720 100644
--- a/arch/csky/include/asm/processor.h
+++ b/arch/csky/include/asm/processor.h
@@ -43,6 +43,7 @@ extern struct cpuinfo_csky cpu_data[];
 struct thread_struct {
 	unsigned long  ksp;       /* kernel stack pointer */
 	unsigned long  sr;        /* saved status register */
+	unsigned long  trap_no;   /* saved status register */
 
 	/* FPU regs */
 	struct user_fp __aligned(16) user_fp;
diff --git a/arch/csky/kernel/traps.c b/arch/csky/kernel/traps.c
index b057480e7463..63715cb90ee9 100644
--- a/arch/csky/kernel/traps.c
+++ b/arch/csky/kernel/traps.c
@@ -115,8 +115,9 @@ asmlinkage void trap_c(struct pt_regs *regs)
 	int sig;
 	unsigned long vector;
 	siginfo_t info;
+	struct task_struct *tsk = current;
 
-	vector = (mfcr("psr") >> 16) & 0xff;
+	vector = (regs->sr >> 16) & 0xff;
 
 	switch (vector) {
 	case VEC_ZERODIV:
@@ -129,6 +130,7 @@ asmlinkage void trap_c(struct pt_regs *regs)
 		sig = SIGTRAP;
 		break;
 	case VEC_ILLEGAL:
+		tsk->thread.trap_no = vector;
 		die_if_kernel("Kernel mode ILLEGAL", regs, vector);
 #ifndef CONFIG_CPU_NO_USER_BKPT
 		if (*(uint16_t *)instruction_pointer(regs) != USR_BKPT)
@@ -146,16 +148,20 @@ asmlinkage void trap_c(struct pt_regs *regs)
 		sig = SIGTRAP;
 		break;
 	case VEC_ACCESS:
+		tsk->thread.trap_no = vector;
 		return buserr(regs);
 #ifdef CONFIG_CPU_NEED_SOFTALIGN
 	case VEC_ALIGN:
+		tsk->thread.trap_no = vector;
 		return csky_alignment(regs);
 #endif
 #ifdef CONFIG_CPU_HAS_FPU
 	case VEC_FPE:
+		tsk->thread.trap_no = vector;
 		die_if_kernel("Kernel mode FPE", regs, vector);
 		return fpu_fpe(regs);
 	case VEC_PRIV:
+		tsk->thread.trap_no = vector;
 		die_if_kernel("Kernel mode PRIV", regs, vector);
 		if (fpu_libc_helper(regs))
 			return;
@@ -164,5 +170,8 @@ asmlinkage void trap_c(struct pt_regs *regs)
 		sig = SIGSEGV;
 		break;
 	}
+
+	tsk->thread.trap_no = vector;
+
 	send_sig(sig, current, 0);
 }
diff --git a/arch/csky/mm/fault.c b/arch/csky/mm/fault.c
index f76618b630f9..562c7f708749 100644
--- a/arch/csky/mm/fault.c
+++ b/arch/csky/mm/fault.c
@@ -179,11 +179,14 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long write,
 bad_area_nosemaphore:
 	/* User mode accesses just cause a SIGSEGV */
 	if (user_mode(regs)) {
+		tsk->thread.trap_no = (regs->sr >> 16) & 0xff;
 		force_sig_fault(SIGSEGV, si_code, (void __user *)address);
 		return;
 	}
 
 no_context:
+	tsk->thread.trap_no = (regs->sr >> 16) & 0xff;
+
 	/* Are we prepared to handle this kernel fault? */
 	if (fixup_exception(regs))
 		return;
@@ -198,6 +201,8 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long write,
 	die_if_kernel("Oops", regs, write);
 
 out_of_memory:
+	tsk->thread.trap_no = (regs->sr >> 16) & 0xff;
+
 	/*
 	 * We ran out of memory, call the OOM killer, and return the userspace
 	 * (which will retry the fault, or kill us if we got oom-killed).
@@ -206,6 +211,8 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long write,
 	return;
 
 do_sigbus:
+	tsk->thread.trap_no = (regs->sr >> 16) & 0xff;
+
 	up_read(&mm->mmap_sem);
 
 	/* Kernel mode? Handle exceptions or die */
-- 
2.17.0


  parent reply	other threads:[~2020-04-03  4:42 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-03  4:41 [PATCH 01/11] csky: Fixup init_fpu compile warning with __init guoren
2020-04-03  4:41 ` [PATCH 02/11] csky: Implement ptrace regs and stack API guoren
2020-04-03  4:41 ` [PATCH 03/11] csky: Add support for restartable sequence guoren
2020-04-03  4:41 ` [PATCH 04/11] csky: Implement ftrace with regs guoren
2020-04-03  4:41 ` [PATCH 05/11] csky/ftrace: Fixup ftrace_modify_code deadlock without CPU_HAS_ICACHE_INS guoren
2020-04-03  4:41 ` guoren [this message]
2020-04-03  4:41 ` [PATCH 07/11] csky: Enable the gcov function guoren
2020-04-03  4:41 ` [PATCH 08/11] csky: Enable LOCKDEP_SUPPORT guoren
2020-04-03  4:41 ` [PATCH 09/11] csky: Add kprobes supported guoren
2020-04-03  4:41 ` [PATCH 10/11] csky: Add uprobes support guoren
2020-04-03  4:41 ` [PATCH 11/11] csky: Fixup cpu speculative execution to IO area guoren

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