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authorRussell King <rmk+kernel@arm.linux.org.uk>2015-12-03 14:34:45 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2015-12-04 19:20:48 +0000
commit77f1b959b0b6db7a7941b4b4f9d3d287c67d7c15 (patch)
tree21189c499624902027284f01f3606b0d66b71ec4
parent08925c2f124f1bac6152a8b234268f9874fc70a5 (diff)
ARM: report proper DACR value in oops dumps
When printing the DACR value, we print the domain register value. This is incorrect, as with SW_PAN enabled, that is the current setting, rather than the faulting context's setting. Arrange to print the faulting domain's saved DACR value instead. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
-rw-r--r--arch/arm/kernel/process.c33
1 files changed, 18 insertions, 15 deletions
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index 7a7c4cea5523..4adfb46e3ee9 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -95,6 +95,22 @@ void __show_regs(struct pt_regs *regs)
{
unsigned long flags;
char buf[64];
+#ifndef CONFIG_CPU_V7M
+ unsigned int domain;
+#ifdef CONFIG_CPU_SW_DOMAIN_PAN
+ /*
+ * Get the domain register for the parent context. In user
+ * mode, we don't save the DACR, so lets use what it should
+ * be. For other modes, we place it after the pt_regs struct.
+ */
+ if (user_mode(regs))
+ domain = DACR_UACCESS_ENABLE;
+ else
+ domain = *(unsigned int *)(regs + 1);
+#else
+ domain = get_domain();
+#endif
+#endif
show_regs_print_info(KERN_DEFAULT);
@@ -123,21 +139,8 @@ void __show_regs(struct pt_regs *regs)
#ifndef CONFIG_CPU_V7M
{
- unsigned int domain = get_domain();
const char *segment;
-#ifdef CONFIG_CPU_SW_DOMAIN_PAN
- /*
- * Get the domain register for the parent context. In user
- * mode, we don't save the DACR, so lets use what it should
- * be. For other modes, we place it after the pt_regs struct.
- */
- if (user_mode(regs))
- domain = DACR_UACCESS_ENABLE;
- else
- domain = *(unsigned int *)(regs + 1);
-#endif
-
if ((domain & domain_mask(DOMAIN_USER)) ==
domain_val(DOMAIN_USER, DOMAIN_NOACCESS))
segment = "none";
@@ -163,11 +166,11 @@ void __show_regs(struct pt_regs *regs)
buf[0] = '\0';
#ifdef CONFIG_CPU_CP15_MMU
{
- unsigned int transbase, dac = get_domain();
+ unsigned int transbase;
asm("mrc p15, 0, %0, c2, c0\n\t"
: "=r" (transbase));
snprintf(buf, sizeof(buf), " Table: %08x DAC: %08x",
- transbase, dac);
+ transbase, domain);
}
#endif
asm("mrc p15, 0, %0, c1, c0\n" : "=r" (ctrl));