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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>
This commit is contained in:
Russell King 2015-12-03 14:34:45 +00:00
parent 08925c2f12
commit 77f1b959b0
1 changed files with 18 additions and 15 deletions
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33
arch/arm/kernel/process.c
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@ -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));