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MIPS: kernel: {ftrace,kgdb}: Set correct address limit for cache flushes

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When flushing the icache, make sure the address limit is correct
so the appropriate 'cache' instruction will be used. This has no
impact on cores operating in non-eva mode. However, when EVA is
enabled, we ensure that 'cache' will be used instead of 'cachee'.

Signed-off-by: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
This commit is contained in:
Leonid Yegoshin 2013-12-16 12:06:55 +00:00 committed by Ralf Baechle
parent de8974e3f7
commit 6ebda44f36
2 changed files with 21 additions and 1 deletions
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4
arch/mips/kernel/ftrace.c
View File

@ -90,6 +90,7 @@ static inline void ftrace_dyn_arch_init_insns(void)
static int ftrace_modify_code(unsigned long ip, unsigned int new_code)
{
int faulted;
mm_segment_t old_fs;
/* *(unsigned int *)ip = new_code; */
safe_store_code(new_code, ip, faulted);
@ -97,7 +98,10 @@ static int ftrace_modify_code(unsigned long ip, unsigned int new_code)
if (unlikely(faulted))
return -EFAULT;
old_fs = get_fs();
set_fs(get_ds());
flush_icache_range(ip, ip + 8);
set_fs(old_fs);
return 0;
}

18
arch/mips/kernel/kgdb.c
View File

@ -32,6 +32,7 @@
#include <asm/cacheflush.h>
#include <asm/processor.h>
#include <asm/sigcontext.h>
#include <asm/uaccess.h>
static struct hard_trap_info {
unsigned char tt; /* Trap type code for MIPS R3xxx and R4xxx */
@ -208,7 +209,14 @@ void arch_kgdb_breakpoint(void)
static void kgdb_call_nmi_hook(void *ignored)
{
mm_segment_t old_fs;
old_fs = get_fs();
set_fs(get_ds());
kgdb_nmicallback(raw_smp_processor_id(), NULL);
set_fs(old_fs);
}
void kgdb_roundup_cpus(unsigned long flags)
@ -282,6 +290,7 @@ static int kgdb_mips_notify(struct notifier_block *self, unsigned long cmd,
struct die_args *args = (struct die_args *)ptr;
struct pt_regs *regs = args->regs;
int trap = (regs->cp0_cause & 0x7c) >> 2;
mm_segment_t old_fs;
#ifdef CONFIG_KPROBES
/*
@ -296,11 +305,17 @@ static int kgdb_mips_notify(struct notifier_block *self, unsigned long cmd,
if (user_mode(regs))
return NOTIFY_DONE;
/* Kernel mode. Set correct address limit */
old_fs = get_fs();
set_fs(get_ds());
if (atomic_read(&kgdb_active) != -1)
kgdb_nmicallback(smp_processor_id(), regs);
if (kgdb_handle_exception(trap, compute_signal(trap), cmd, regs))
if (kgdb_handle_exception(trap, compute_signal(trap), cmd, regs)) {
set_fs(old_fs);
return NOTIFY_DONE;
}
if (atomic_read(&kgdb_setting_breakpoint))
if ((trap == 9) && (regs->cp0_epc == (unsigned long)breakinst))
@ -310,6 +325,7 @@ static int kgdb_mips_notify(struct notifier_block *self, unsigned long cmd,
local_irq_enable();
__flush_cache_all();
set_fs(old_fs);
return NOTIFY_STOP;
}